19f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 29f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jquant2.c 39f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 49f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Copyright (C) 1991-1996, Thomas G. Lane. 59f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This file is part of the Independent JPEG Group's software. 69f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * For conditions of distribution and use, see the accompanying README file. 79f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 89f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This file contains 2-pass color quantization (color mapping) routines. 99f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * These routines provide selection of a custom color map for an image, 109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * followed by mapping of the image to that color map, with optional 119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Floyd-Steinberg dithering. 129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * It is also possible to use just the second pass to map to an arbitrary 139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * externally-given color map. 149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Note: ordered dithering is not supported, since there isn't any fast 169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * way to compute intercolor distances; it's unclear that ordered dither's 179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * fundamental assumptions even hold with an irregularly spaced color map. 189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define JPEG_INTERNALS 219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jinclude.h" 229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jpeglib.h" 239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef QUANT_2PASS_SUPPORTED 259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This module implements the well-known Heckbert paradigm for color 299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * quantization. Most of the ideas used here can be traced back to 309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Heckbert's seminal paper 319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Heckbert, Paul. "Color Image Quantization for Frame Buffer Display", 329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Proc. SIGGRAPH '82, Computer Graphics v.16 #3 (July 1982), pp 297-304. 339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * In the first pass over the image, we accumulate a histogram showing the 359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * usage count of each possible color. To keep the histogram to a reasonable 369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * size, we reduce the precision of the input; typical practice is to retain 379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 5 or 6 bits per color, so that 8 or 4 different input values are counted 389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * in the same histogram cell. 399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Next, the color-selection step begins with a box representing the whole 419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * color space, and repeatedly splits the "largest" remaining box until we 429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * have as many boxes as desired colors. Then the mean color in each 439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * remaining box becomes one of the possible output colors. 449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The second pass over the image maps each input pixel to the closest output 469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * color (optionally after applying a Floyd-Steinberg dithering correction). 479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This mapping is logically trivial, but making it go fast enough requires 489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * considerable care. 499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Heckbert-style quantizers vary a good deal in their policies for choosing 519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the "largest" box and deciding where to cut it. The particular policies 529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * used here have proved out well in experimental comparisons, but better ones 539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * may yet be found. 549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * In earlier versions of the IJG code, this module quantized in YCbCr color 569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * space, processing the raw upsampled data without a color conversion step. 579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This allowed the color conversion math to be done only once per colormap 589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * entry, not once per pixel. However, that optimization precluded other 599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * useful optimizations (such as merging color conversion with upsampling) 609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * and it also interfered with desired capabilities such as quantizing to an 619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * externally-supplied colormap. We have therefore abandoned that approach. 629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The present code works in the post-conversion color space, typically RGB. 639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * To improve the visual quality of the results, we actually work in scaled 659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * RGB space, giving G distances more weight than R, and R in turn more than 669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * B. To do everything in integer math, we must use integer scale factors. 679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The 2/3/1 scale factors used here correspond loosely to the relative 689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * weights of the colors in the NTSC grayscale equation. 699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * If you want to use this code to quantize a non-RGB color space, you'll 709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * probably need to change these scale factors. 719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define R_SCALE 2 /* scale R distances by this much */ 749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define G_SCALE 3 /* scale G distances by this much */ 759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define B_SCALE 1 /* and B by this much */ 769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Relabel R/G/B as components 0/1/2, respecting the RGB ordering defined 789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * in jmorecfg.h. As the code stands, it will do the right thing for R,G,B 799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * and B,G,R orders. If you define some other weird order in jmorecfg.h, 809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * you'll get compile errors until you extend this logic. In that case 819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * you'll probably want to tweak the histogram sizes too. 829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if RGB_RED == 0 859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define C0_SCALE R_SCALE 869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if RGB_BLUE == 0 889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define C0_SCALE B_SCALE 899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if RGB_GREEN == 1 919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define C1_SCALE G_SCALE 929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if RGB_RED == 2 949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define C2_SCALE R_SCALE 959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if RGB_BLUE == 2 979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define C2_SCALE B_SCALE 989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * First we have the histogram data structure and routines for creating it. 1039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The number of bits of precision can be adjusted by changing these symbols. 1059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We recommend keeping 6 bits for G and 5 each for R and B. 1069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * If you have plenty of memory and cycles, 6 bits all around gives marginally 1079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * better results; if you are short of memory, 5 bits all around will save 1089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * some space but degrade the results. 1099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * To maintain a fully accurate histogram, we'd need to allocate a "long" 1109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (preferably unsigned long) for each cell. In practice this is overkill; 1119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * we can get by with 16 bits per cell. Few of the cell counts will overflow, 1129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * and clamping those that do overflow to the maximum value will give close- 1139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * enough results. This reduces the recommended histogram size from 256Kb 1149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * to 128Kb, which is a useful savings on PC-class machines. 1159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (In the second pass the histogram space is re-used for pixel mapping data; 1169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * in that capacity, each cell must be able to store zero to the number of 1179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * desired colors. 16 bits/cell is plenty for that too.) 1189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Since the JPEG code is intended to run in small memory model on 80x86 1199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * machines, we can't just allocate the histogram in one chunk. Instead 1209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * of a true 3-D array, we use a row of pointers to 2-D arrays. Each 1219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * pointer corresponds to a C0 value (typically 2^5 = 32 pointers) and 1229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * each 2-D array has 2^6*2^5 = 2048 or 2^6*2^6 = 4096 entries. Note that 1239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * on 80x86 machines, the pointer row is in near memory but the actual 1249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * arrays are in far memory (same arrangement as we use for image arrays). 1259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define MAXNUMCOLORS (MAXJSAMPLE+1) /* maximum size of colormap */ 1289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* These will do the right thing for either R,G,B or B,G,R color order, 1309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * but you may not like the results for other color orders. 1319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define HIST_C0_BITS 5 /* bits of precision in R/B histogram */ 1339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define HIST_C1_BITS 6 /* bits of precision in G histogram */ 1349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define HIST_C2_BITS 5 /* bits of precision in B/R histogram */ 1359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Number of elements along histogram axes. */ 1379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define HIST_C0_ELEMS (1<<HIST_C0_BITS) 1389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define HIST_C1_ELEMS (1<<HIST_C1_BITS) 1399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define HIST_C2_ELEMS (1<<HIST_C2_BITS) 1409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* These are the amounts to shift an input value to get a histogram index. */ 1429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define C0_SHIFT (BITS_IN_JSAMPLE-HIST_C0_BITS) 1439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define C1_SHIFT (BITS_IN_JSAMPLE-HIST_C1_BITS) 1449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define C2_SHIFT (BITS_IN_JSAMPLE-HIST_C2_BITS) 1459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef UINT16 histcell; /* histogram cell; prefer an unsigned type */ 1489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef histcell FAR * histptr; /* for pointers to histogram cells */ 1509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef histcell hist1d[HIST_C2_ELEMS]; /* typedefs for the array */ 1529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef hist1d FAR * hist2d; /* type for the 2nd-level pointers */ 1539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef hist2d * hist3d; /* type for top-level pointer */ 1549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Declarations for Floyd-Steinberg dithering. 1579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Errors are accumulated into the array fserrors[], at a resolution of 1599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1/16th of a pixel count. The error at a given pixel is propagated 1609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * to its not-yet-processed neighbors using the standard F-S fractions, 1619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * ... (here) 7/16 1629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 3/16 5/16 1/16 1639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We work left-to-right on even rows, right-to-left on odd rows. 1649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We can get away with a single array (holding one row's worth of errors) 1669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * by using it to store the current row's errors at pixel columns not yet 1679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * processed, but the next row's errors at columns already processed. We 1689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * need only a few extra variables to hold the errors immediately around the 1699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * current column. (If we are lucky, those variables are in registers, but 1709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * even if not, they're probably cheaper to access than array elements are.) 1719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The fserrors[] array has (#columns + 2) entries; the extra entry at 1739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * each end saves us from special-casing the first and last pixels. 1749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Each entry is three values long, one value for each color component. 1759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Note: on a wide image, we might not have enough room in a PC's near data 1779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * segment to hold the error array; so it is allocated with alloc_large. 1789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if BITS_IN_JSAMPLE == 8 1819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef INT16 FSERROR; /* 16 bits should be enough */ 1829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef int LOCFSERROR; /* use 'int' for calculation temps */ 1839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 1849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef INT32 FSERROR; /* may need more than 16 bits */ 1859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef INT32 LOCFSERROR; /* be sure calculation temps are big enough */ 1869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 1879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef FSERROR FAR *FSERRPTR; /* pointer to error array (in FAR storage!) */ 1899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Private subobject */ 1929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef struct { 1949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project struct jpeg_color_quantizer pub; /* public fields */ 1959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Space for the eventually created colormap is stashed here */ 1979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY sv_colormap; /* colormap allocated at init time */ 1989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int desired; /* desired # of colors = size of colormap */ 1999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Variables for accumulating image statistics */ 2019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project hist3d histogram; /* pointer to the histogram */ 2029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boolean needs_zeroed; /* TRUE if next pass must zero histogram */ 2049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Variables for Floyd-Steinberg dithering */ 2069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project FSERRPTR fserrors; /* accumulated errors */ 2079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boolean on_odd_row; /* flag to remember which row we are on */ 2089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int * error_limiter; /* table for clamping the applied error */ 2099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} my_cquantizer; 2109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef my_cquantizer * my_cquantize_ptr; 2129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 2159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Prescan some rows of pixels. 2169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * In this module the prescan simply updates the histogram, which has been 2179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * initialized to zeroes by start_pass. 2189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * An output_buf parameter is required by the method signature, but no data 2199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * is actually output (in fact the buffer controller is probably passing a 2209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * NULL pointer). 2219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 2249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectprescan_quantize (j_decompress_ptr cinfo, JSAMPARRAY input_buf, 2259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_buf, int num_rows) 2269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; 2289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register JSAMPROW ptr; 2299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register histptr histp; 2309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register hist3d histogram = cquantize->histogram; 2319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int row; 2329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION col; 2339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION width = cinfo->output_width; 2349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (row = 0; row < num_rows; row++) { 2369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ptr = input_buf[row]; 2379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (col = width; col > 0; col--) { 2389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* get pixel value and index into the histogram */ 2399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project histp = & histogram[GETJSAMPLE(ptr[0]) >> C0_SHIFT] 2409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project [GETJSAMPLE(ptr[1]) >> C1_SHIFT] 2419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project [GETJSAMPLE(ptr[2]) >> C2_SHIFT]; 2429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* increment, check for overflow and undo increment if so. */ 2439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (++(*histp) <= 0) 2449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*histp)--; 2459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ptr += 3; 2469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 2529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Next we have the really interesting routines: selection of a colormap 2539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * given the completed histogram. 2549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * These routines work with a list of "boxes", each representing a rectangular 2559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * subset of the input color space (to histogram precision). 2569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef struct { 2599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* The bounds of the box (inclusive); expressed as histogram indexes */ 2609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int c0min, c0max; 2619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int c1min, c1max; 2629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int c2min, c2max; 2639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* The volume (actually 2-norm) of the box */ 2649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 volume; 2659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* The number of nonzero histogram cells within this box */ 2669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project long colorcount; 2679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} box; 2689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef box * boxptr; 2709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(boxptr) 2739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectfind_biggest_color_pop (boxptr boxlist, int numboxes) 2749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Find the splittable box with the largest color population */ 2759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Returns NULL if no splittable boxes remain */ 2769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register boxptr boxp; 2789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int i; 2799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register long maxc = 0; 2809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxptr which = NULL; 2819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0, boxp = boxlist; i < numboxes; i++, boxp++) { 2839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (boxp->colorcount > maxc && boxp->volume > 0) { 2849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project which = boxp; 2859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project maxc = boxp->colorcount; 2869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return which; 2899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(boxptr) 2939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectfind_biggest_volume (boxptr boxlist, int numboxes) 2949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Find the splittable box with the largest (scaled) volume */ 2959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Returns NULL if no splittable boxes remain */ 2969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register boxptr boxp; 2989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int i; 2999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register INT32 maxv = 0; 3009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxptr which = NULL; 3019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0, boxp = boxlist; i < numboxes; i++, boxp++) { 3039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (boxp->volume > maxv) { 3049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project which = boxp; 3059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project maxv = boxp->volume; 3069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return which; 3099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 3139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectupdate_box (j_decompress_ptr cinfo, boxptr boxp) 3149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Shrink the min/max bounds of a box to enclose only nonzero elements, */ 3159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* and recompute its volume and population */ 3169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; 3189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project hist3d histogram = cquantize->histogram; 3199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project histptr histp; 3209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int c0,c1,c2; 3219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int c0min,c0max,c1min,c1max,c2min,c2max; 3229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 dist0,dist1,dist2; 3239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project long ccount; 3249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c0min = boxp->c0min; c0max = boxp->c0max; 3269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c1min = boxp->c1min; c1max = boxp->c1max; 3279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c2min = boxp->c2min; c2max = boxp->c2max; 3289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c0max > c0min) 3309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c0 = c0min; c0 <= c0max; c0++) 3319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c1 = c1min; c1 <= c1max; c1++) { 3329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project histp = & histogram[c0][c1][c2min]; 3339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c2 = c2min; c2 <= c2max; c2++) 3349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (*histp++ != 0) { 3359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxp->c0min = c0min = c0; 3369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project goto have_c0min; 3379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project have_c0min: 3409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c0max > c0min) 3419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c0 = c0max; c0 >= c0min; c0--) 3429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c1 = c1min; c1 <= c1max; c1++) { 3439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project histp = & histogram[c0][c1][c2min]; 3449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c2 = c2min; c2 <= c2max; c2++) 3459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (*histp++ != 0) { 3469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxp->c0max = c0max = c0; 3479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project goto have_c0max; 3489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project have_c0max: 3519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c1max > c1min) 3529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c1 = c1min; c1 <= c1max; c1++) 3539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c0 = c0min; c0 <= c0max; c0++) { 3549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project histp = & histogram[c0][c1][c2min]; 3559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c2 = c2min; c2 <= c2max; c2++) 3569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (*histp++ != 0) { 3579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxp->c1min = c1min = c1; 3589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project goto have_c1min; 3599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project have_c1min: 3629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c1max > c1min) 3639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c1 = c1max; c1 >= c1min; c1--) 3649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c0 = c0min; c0 <= c0max; c0++) { 3659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project histp = & histogram[c0][c1][c2min]; 3669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c2 = c2min; c2 <= c2max; c2++) 3679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (*histp++ != 0) { 3689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxp->c1max = c1max = c1; 3699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project goto have_c1max; 3709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project have_c1max: 3739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c2max > c2min) 3749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c2 = c2min; c2 <= c2max; c2++) 3759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c0 = c0min; c0 <= c0max; c0++) { 3769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project histp = & histogram[c0][c1min][c2]; 3779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c1 = c1min; c1 <= c1max; c1++, histp += HIST_C2_ELEMS) 3789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (*histp != 0) { 3799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxp->c2min = c2min = c2; 3809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project goto have_c2min; 3819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project have_c2min: 3849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c2max > c2min) 3859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c2 = c2max; c2 >= c2min; c2--) 3869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c0 = c0min; c0 <= c0max; c0++) { 3879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project histp = & histogram[c0][c1min][c2]; 3889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c1 = c1min; c1 <= c1max; c1++, histp += HIST_C2_ELEMS) 3899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (*histp != 0) { 3909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxp->c2max = c2max = c2; 3919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project goto have_c2max; 3929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project have_c2max: 3959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Update box volume. 3979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We use 2-norm rather than real volume here; this biases the method 3989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * against making long narrow boxes, and it has the side benefit that 3999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * a box is splittable iff norm > 0. 4009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Since the differences are expressed in histogram-cell units, 4019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * we have to shift back to JSAMPLE units to get consistent distances; 4029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * after which, we scale according to the selected distance scale factors. 4039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dist0 = ((c0max - c0min) << C0_SHIFT) * C0_SCALE; 4059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dist1 = ((c1max - c1min) << C1_SHIFT) * C1_SCALE; 4069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dist2 = ((c2max - c2min) << C2_SHIFT) * C2_SCALE; 4079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxp->volume = dist0*dist0 + dist1*dist1 + dist2*dist2; 4089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Now scan remaining volume of box and compute population */ 4109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ccount = 0; 4119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c0 = c0min; c0 <= c0max; c0++) 4129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c1 = c1min; c1 <= c1max; c1++) { 4139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project histp = & histogram[c0][c1][c2min]; 4149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c2 = c2min; c2 <= c2max; c2++, histp++) 4159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (*histp != 0) { 4169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ccount++; 4179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxp->colorcount = ccount; 4209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 4219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(int) 4249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectmedian_cut (j_decompress_ptr cinfo, boxptr boxlist, int numboxes, 4259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int desired_colors) 4269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Repeatedly select and split the largest box until we have enough boxes */ 4279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 4289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int n,lb; 4299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int c0,c1,c2,cmax; 4309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register boxptr b1,b2; 4319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (numboxes < desired_colors) { 4339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Select box to split. 4349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Current algorithm: by population for first half, then by volume. 4359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (numboxes*2 <= desired_colors) { 4379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project b1 = find_biggest_color_pop(boxlist, numboxes); 4389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 4399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project b1 = find_biggest_volume(boxlist, numboxes); 4409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (b1 == NULL) /* no splittable boxes left! */ 4429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project break; 4439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project b2 = &boxlist[numboxes]; /* where new box will go */ 4449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Copy the color bounds to the new box. */ 4459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project b2->c0max = b1->c0max; b2->c1max = b1->c1max; b2->c2max = b1->c2max; 4469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project b2->c0min = b1->c0min; b2->c1min = b1->c1min; b2->c2min = b1->c2min; 4479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Choose which axis to split the box on. 4489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Current algorithm: longest scaled axis. 4499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * See notes in update_box about scaling distances. 4509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c0 = ((b1->c0max - b1->c0min) << C0_SHIFT) * C0_SCALE; 4529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c1 = ((b1->c1max - b1->c1min) << C1_SHIFT) * C1_SCALE; 4539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c2 = ((b1->c2max - b1->c2min) << C2_SHIFT) * C2_SCALE; 4549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* We want to break any ties in favor of green, then red, blue last. 4559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This code does the right thing for R,G,B or B,G,R color orders only. 4569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if RGB_RED == 0 4589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cmax = c1; n = 1; 4599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c0 > cmax) { cmax = c0; n = 0; } 4609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c2 > cmax) { n = 2; } 4619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 4629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cmax = c1; n = 1; 4639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c2 > cmax) { cmax = c2; n = 2; } 4649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c0 > cmax) { n = 0; } 4659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 4669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Choose split point along selected axis, and update box bounds. 4679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Current algorithm: split at halfway point. 4689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (Since the box has been shrunk to minimum volume, 4699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * any split will produce two nonempty subboxes.) 4709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Note that lb value is max for lower box, so must be < old max. 4719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project switch (n) { 4739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case 0: 4749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project lb = (b1->c0max + b1->c0min) / 2; 4759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project b1->c0max = lb; 4769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project b2->c0min = lb+1; 4779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project break; 4789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case 1: 4799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project lb = (b1->c1max + b1->c1min) / 2; 4809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project b1->c1max = lb; 4819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project b2->c1min = lb+1; 4829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project break; 4839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case 2: 4849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project lb = (b1->c2max + b1->c2min) / 2; 4859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project b1->c2max = lb; 4869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project b2->c2min = lb+1; 4879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project break; 4889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Update stats for boxes */ 4909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project update_box(cinfo, b1); 4919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project update_box(cinfo, b2); 4929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project numboxes++; 4939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return numboxes; 4959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 4969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 4999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectcompute_color (j_decompress_ptr cinfo, boxptr boxp, int icolor) 5009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Compute representative color for a box, put it in colormap[icolor] */ 5019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 5029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Current algorithm: mean weighted by pixels (not colors) */ 5039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Note it is important to get the rounding correct! */ 5049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; 5059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project hist3d histogram = cquantize->histogram; 5069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project histptr histp; 5079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int c0,c1,c2; 5089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int c0min,c0max,c1min,c1max,c2min,c2max; 5099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project long count; 5109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project long total = 0; 5119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project long c0total = 0; 5129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project long c1total = 0; 5139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project long c2total = 0; 5149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c0min = boxp->c0min; c0max = boxp->c0max; 5169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c1min = boxp->c1min; c1max = boxp->c1max; 5179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c2min = boxp->c2min; c2max = boxp->c2max; 5189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c0 = c0min; c0 <= c0max; c0++) 5209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c1 = c1min; c1 <= c1max; c1++) { 5219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project histp = & histogram[c0][c1][c2min]; 5229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (c2 = c2min; c2 <= c2max; c2++) { 5239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((count = *histp++) != 0) { 5249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project total += count; 5259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c0total += ((c0 << C0_SHIFT) + ((1<<C0_SHIFT)>>1)) * count; 5269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c1total += ((c1 << C1_SHIFT) + ((1<<C1_SHIFT)>>1)) * count; 5279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c2total += ((c2 << C2_SHIFT) + ((1<<C2_SHIFT)>>1)) * count; 5289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->colormap[0][icolor] = (JSAMPLE) ((c0total + (total>>1)) / total); 5339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->colormap[1][icolor] = (JSAMPLE) ((c1total + (total>>1)) / total); 5349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->colormap[2][icolor] = (JSAMPLE) ((c2total + (total>>1)) / total); 5359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 5369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 5399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectselect_colors (j_decompress_ptr cinfo, int desired_colors) 5409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Master routine for color selection */ 5419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 5429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxptr boxlist; 5439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int numboxes; 5449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int i; 5459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Allocate workspace for box list */ 5479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxlist = (boxptr) (*cinfo->mem->alloc_small) 5489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((j_common_ptr) cinfo, JPOOL_IMAGE, desired_colors * SIZEOF(box)); 5499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Initialize one box containing whole space */ 5509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project numboxes = 1; 5519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxlist[0].c0min = 0; 5529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxlist[0].c0max = MAXJSAMPLE >> C0_SHIFT; 5539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxlist[0].c1min = 0; 5549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxlist[0].c1max = MAXJSAMPLE >> C1_SHIFT; 5559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxlist[0].c2min = 0; 5569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boxlist[0].c2max = MAXJSAMPLE >> C2_SHIFT; 5579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Shrink it to actually-used volume and set its statistics */ 5589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project update_box(cinfo, & boxlist[0]); 5599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Perform median-cut to produce final box list */ 5609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project numboxes = median_cut(cinfo, boxlist, numboxes, desired_colors); 5619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Compute the representative color for each box, fill colormap */ 5629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0; i < numboxes; i++) 5639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project compute_color(cinfo, & boxlist[i], i); 5649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->actual_number_of_colors = numboxes; 5659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project TRACEMS1(cinfo, 1, JTRC_QUANT_SELECTED, numboxes); 5669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 5679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 5709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * These routines are concerned with the time-critical task of mapping input 5719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * colors to the nearest color in the selected colormap. 5729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 5739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We re-use the histogram space as an "inverse color map", essentially a 5749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * cache for the results of nearest-color searches. All colors within a 5759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * histogram cell will be mapped to the same colormap entry, namely the one 5769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * closest to the cell's center. This may not be quite the closest entry to 5779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the actual input color, but it's almost as good. A zero in the cache 5789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * indicates we haven't found the nearest color for that cell yet; the array 5799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * is cleared to zeroes before starting the mapping pass. When we find the 5809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * nearest color for a cell, its colormap index plus one is recorded in the 5819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * cache for future use. The pass2 scanning routines call fill_inverse_cmap 5829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * when they need to use an unfilled entry in the cache. 5839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 5849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Our method of efficiently finding nearest colors is based on the "locally 5859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * sorted search" idea described by Heckbert and on the incremental distance 5869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * calculation described by Spencer W. Thomas in chapter III.1 of Graphics 5879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Gems II (James Arvo, ed. Academic Press, 1991). Thomas points out that 5889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the distances from a given colormap entry to each cell of the histogram can 5899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * be computed quickly using an incremental method: the differences between 5909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * distances to adjacent cells themselves differ by a constant. This allows a 5919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * fairly fast implementation of the "brute force" approach of computing the 5929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * distance from every colormap entry to every histogram cell. Unfortunately, 5939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * it needs a work array to hold the best-distance-so-far for each histogram 5949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * cell (because the inner loop has to be over cells, not colormap entries). 5959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The work array elements have to be INT32s, so the work array would need 5969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 256Kb at our recommended precision. This is not feasible in DOS machines. 5979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 5989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * To get around these problems, we apply Thomas' method to compute the 5999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * nearest colors for only the cells within a small subbox of the histogram. 6009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The work array need be only as big as the subbox, so the memory usage 6019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * problem is solved. Furthermore, we need not fill subboxes that are never 6029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * referenced in pass2; many images use only part of the color gamut, so a 6039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * fair amount of work is saved. An additional advantage of this 6049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * approach is that we can apply Heckbert's locality criterion to quickly 6059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * eliminate colormap entries that are far away from the subbox; typically 6069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * three-fourths of the colormap entries are rejected by Heckbert's criterion, 6079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * and we need not compute their distances to individual cells in the subbox. 6089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The speed of this approach is heavily influenced by the subbox size: too 6099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * small means too much overhead, too big loses because Heckbert's criterion 6109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * can't eliminate as many colormap entries. Empirically the best subbox 6119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * size seems to be about 1/512th of the histogram (1/8th in each direction). 6129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 6139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Thomas' article also describes a refined method which is asymptotically 6149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * faster than the brute-force method, but it is also far more complex and 6159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * cannot efficiently be applied to small subboxes. It is therefore not 6169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * useful for programs intended to be portable to DOS machines. On machines 6179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * with plenty of memory, filling the whole histogram in one shot with Thomas' 6189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * refined method might be faster than the present code --- but then again, 6199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * it might not be any faster, and it's certainly more complicated. 6209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 6219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* log2(histogram cells in update box) for each axis; this can be adjusted */ 6249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define BOX_C0_LOG (HIST_C0_BITS-3) 6259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define BOX_C1_LOG (HIST_C1_BITS-3) 6269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define BOX_C2_LOG (HIST_C2_BITS-3) 6279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define BOX_C0_ELEMS (1<<BOX_C0_LOG) /* # of hist cells in update box */ 6299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define BOX_C1_ELEMS (1<<BOX_C1_LOG) 6309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define BOX_C2_ELEMS (1<<BOX_C2_LOG) 6319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define BOX_C0_SHIFT (C0_SHIFT + BOX_C0_LOG) 6339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define BOX_C1_SHIFT (C1_SHIFT + BOX_C1_LOG) 6349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define BOX_C2_SHIFT (C2_SHIFT + BOX_C2_LOG) 6359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 6389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The next three routines implement inverse colormap filling. They could 6399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * all be folded into one big routine, but splitting them up this way saves 6409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * some stack space (the mindist[] and bestdist[] arrays need not coexist) 6419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * and may allow some compilers to produce better code by registerizing more 6429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * inner-loop variables. 6439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 6449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(int) 6469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectfind_nearby_colors (j_decompress_ptr cinfo, int minc0, int minc1, int minc2, 6479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPLE colorlist[]) 6489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Locate the colormap entries close enough to an update box to be candidates 6499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * for the nearest entry to some cell(s) in the update box. The update box 6509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * is specified by the center coordinates of its first cell. The number of 6519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * candidate colormap entries is returned, and their colormap indexes are 6529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * placed in colorlist[]. 6539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This routine uses Heckbert's "locally sorted search" criterion to select 6549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the colors that need further consideration. 6559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 6569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 6579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int numcolors = cinfo->actual_number_of_colors; 6589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int maxc0, maxc1, maxc2; 6599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int centerc0, centerc1, centerc2; 6609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int i, x, ncolors; 6619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 minmaxdist, min_dist, max_dist, tdist; 6629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 mindist[MAXNUMCOLORS]; /* min distance to colormap entry i */ 6639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Compute true coordinates of update box's upper corner and center. 6659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Actually we compute the coordinates of the center of the upper-corner 6669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * histogram cell, which are the upper bounds of the volume we care about. 6679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Note that since ">>" rounds down, the "center" values may be closer to 6689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * min than to max; hence comparisons to them must be "<=", not "<". 6699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 6709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project maxc0 = minc0 + ((1 << BOX_C0_SHIFT) - (1 << C0_SHIFT)); 6719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project centerc0 = (minc0 + maxc0) >> 1; 6729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project maxc1 = minc1 + ((1 << BOX_C1_SHIFT) - (1 << C1_SHIFT)); 6739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project centerc1 = (minc1 + maxc1) >> 1; 6749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project maxc2 = minc2 + ((1 << BOX_C2_SHIFT) - (1 << C2_SHIFT)); 6759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project centerc2 = (minc2 + maxc2) >> 1; 6769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* For each color in colormap, find: 6789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1. its minimum squared-distance to any point in the update box 6799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (zero if color is within update box); 6809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 2. its maximum squared-distance to any point in the update box. 6819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Both of these can be found by considering only the corners of the box. 6829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We save the minimum distance for each color in mindist[]; 6839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * only the smallest maximum distance is of interest. 6849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 6859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project minmaxdist = 0x7FFFFFFFL; 6869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0; i < numcolors; i++) { 6889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* We compute the squared-c0-distance term, then add in the other two. */ 6899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project x = GETJSAMPLE(cinfo->colormap[0][i]); 6909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (x < minc0) { 6919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - minc0) * C0_SCALE; 6929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project min_dist = tdist*tdist; 6939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - maxc0) * C0_SCALE; 6949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project max_dist = tdist*tdist; 6959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else if (x > maxc0) { 6969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - maxc0) * C0_SCALE; 6979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project min_dist = tdist*tdist; 6989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - minc0) * C0_SCALE; 6999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project max_dist = tdist*tdist; 7009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 7019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* within cell range so no contribution to min_dist */ 7029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project min_dist = 0; 7039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (x <= centerc0) { 7049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - maxc0) * C0_SCALE; 7059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project max_dist = tdist*tdist; 7069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 7079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - minc0) * C0_SCALE; 7089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project max_dist = tdist*tdist; 7099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project x = GETJSAMPLE(cinfo->colormap[1][i]); 7139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (x < minc1) { 7149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - minc1) * C1_SCALE; 7159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project min_dist += tdist*tdist; 7169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - maxc1) * C1_SCALE; 7179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project max_dist += tdist*tdist; 7189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else if (x > maxc1) { 7199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - maxc1) * C1_SCALE; 7209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project min_dist += tdist*tdist; 7219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - minc1) * C1_SCALE; 7229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project max_dist += tdist*tdist; 7239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 7249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* within cell range so no contribution to min_dist */ 7259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (x <= centerc1) { 7269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - maxc1) * C1_SCALE; 7279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project max_dist += tdist*tdist; 7289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 7299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - minc1) * C1_SCALE; 7309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project max_dist += tdist*tdist; 7319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project x = GETJSAMPLE(cinfo->colormap[2][i]); 7359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (x < minc2) { 7369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - minc2) * C2_SCALE; 7379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project min_dist += tdist*tdist; 7389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - maxc2) * C2_SCALE; 7399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project max_dist += tdist*tdist; 7409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else if (x > maxc2) { 7419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - maxc2) * C2_SCALE; 7429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project min_dist += tdist*tdist; 7439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - minc2) * C2_SCALE; 7449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project max_dist += tdist*tdist; 7459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 7469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* within cell range so no contribution to min_dist */ 7479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (x <= centerc2) { 7489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - maxc2) * C2_SCALE; 7499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project max_dist += tdist*tdist; 7509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 7519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tdist = (x - minc2) * C2_SCALE; 7529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project max_dist += tdist*tdist; 7539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project mindist[i] = min_dist; /* save away the results */ 7579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (max_dist < minmaxdist) 7589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project minmaxdist = max_dist; 7599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Now we know that no cell in the update box is more than minmaxdist 7629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * away from some colormap entry. Therefore, only colors that are 7639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * within minmaxdist of some part of the box need be considered. 7649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 7659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ncolors = 0; 7669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0; i < numcolors; i++) { 7679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (mindist[i] <= minmaxdist) 7689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project colorlist[ncolors++] = (JSAMPLE) i; 7699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return ncolors; 7719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 7729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 7759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectfind_best_colors (j_decompress_ptr cinfo, int minc0, int minc1, int minc2, 7769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int numcolors, JSAMPLE colorlist[], JSAMPLE bestcolor[]) 7779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Find the closest colormap entry for each cell in the update box, 7789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * given the list of candidate colors prepared by find_nearby_colors. 7799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Return the indexes of the closest entries in the bestcolor[] array. 7809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This routine uses Thomas' incremental distance calculation method to 7819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * find the distance from a colormap entry to successive cells in the box. 7829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 7839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 7849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ic0, ic1, ic2; 7859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int i, icolor; 7869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register INT32 * bptr; /* pointer into bestdist[] array */ 7879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPLE * cptr; /* pointer into bestcolor[] array */ 7889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 dist0, dist1; /* initial distance values */ 7899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register INT32 dist2; /* current distance in inner loop */ 7909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 xx0, xx1; /* distance increments */ 7919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register INT32 xx2; 7929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 inc0, inc1, inc2; /* initial values for increments */ 7939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* This array holds the distance to the nearest-so-far color for each cell */ 7949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 bestdist[BOX_C0_ELEMS * BOX_C1_ELEMS * BOX_C2_ELEMS]; 7959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Initialize best-distance for each cell of the update box */ 7979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project bptr = bestdist; 7989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = BOX_C0_ELEMS*BOX_C1_ELEMS*BOX_C2_ELEMS-1; i >= 0; i--) 7999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *bptr++ = 0x7FFFFFFFL; 8009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* For each color selected by find_nearby_colors, 8029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * compute its distance to the center of each cell in the box. 8039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * If that's less than best-so-far, update best distance and color number. 8049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 8059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Nominal steps between cell centers ("x" in Thomas article) */ 8079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define STEP_C0 ((1 << C0_SHIFT) * C0_SCALE) 8089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define STEP_C1 ((1 << C1_SHIFT) * C1_SCALE) 8099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define STEP_C2 ((1 << C2_SHIFT) * C2_SCALE) 8109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0; i < numcolors; i++) { 8129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project icolor = GETJSAMPLE(colorlist[i]); 8139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Compute (square of) distance from minc0/c1/c2 to this color */ 8149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inc0 = (minc0 - GETJSAMPLE(cinfo->colormap[0][icolor])) * C0_SCALE; 8159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dist0 = inc0*inc0; 8169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inc1 = (minc1 - GETJSAMPLE(cinfo->colormap[1][icolor])) * C1_SCALE; 8179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dist0 += inc1*inc1; 8189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inc2 = (minc2 - GETJSAMPLE(cinfo->colormap[2][icolor])) * C2_SCALE; 8199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dist0 += inc2*inc2; 8209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Form the initial difference increments */ 8219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inc0 = inc0 * (2 * STEP_C0) + STEP_C0 * STEP_C0; 8229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inc1 = inc1 * (2 * STEP_C1) + STEP_C1 * STEP_C1; 8239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inc2 = inc2 * (2 * STEP_C2) + STEP_C2 * STEP_C2; 8249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Now loop over all cells in box, updating distance per Thomas method */ 8259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project bptr = bestdist; 8269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cptr = bestcolor; 8279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xx0 = inc0; 8289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ic0 = BOX_C0_ELEMS-1; ic0 >= 0; ic0--) { 8299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dist1 = dist0; 8309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xx1 = inc1; 8319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ic1 = BOX_C1_ELEMS-1; ic1 >= 0; ic1--) { 8329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dist2 = dist1; 8339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xx2 = inc2; 8349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ic2 = BOX_C2_ELEMS-1; ic2 >= 0; ic2--) { 8359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (dist2 < *bptr) { 8369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *bptr = dist2; 8379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *cptr = (JSAMPLE) icolor; 8389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 8399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dist2 += xx2; 8409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xx2 += 2 * STEP_C2 * STEP_C2; 8419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project bptr++; 8429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cptr++; 8439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 8449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dist1 += xx1; 8459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xx1 += 2 * STEP_C1 * STEP_C1; 8469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 8479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dist0 += xx0; 8489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xx0 += 2 * STEP_C0 * STEP_C0; 8499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 8509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 8519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 8529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 8559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectfill_inverse_cmap (j_decompress_ptr cinfo, int c0, int c1, int c2) 8569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Fill the inverse-colormap entries in the update box that contains */ 8579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* histogram cell c0/c1/c2. (Only that one cell MUST be filled, but */ 8589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* we can fill as many others as we wish.) */ 8599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 8609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; 8619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project hist3d histogram = cquantize->histogram; 8629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int minc0, minc1, minc2; /* lower left corner of update box */ 8639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ic0, ic1, ic2; 8649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register JSAMPLE * cptr; /* pointer into bestcolor[] array */ 8659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register histptr cachep; /* pointer into main cache array */ 8669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* This array lists the candidate colormap indexes. */ 8679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPLE colorlist[MAXNUMCOLORS]; 8689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int numcolors; /* number of candidate colors */ 8699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* This array holds the actually closest colormap index for each cell. */ 8709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPLE bestcolor[BOX_C0_ELEMS * BOX_C1_ELEMS * BOX_C2_ELEMS]; 8719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Convert cell coordinates to update box ID */ 8739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c0 >>= BOX_C0_LOG; 8749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c1 >>= BOX_C1_LOG; 8759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c2 >>= BOX_C2_LOG; 8769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Compute true coordinates of update box's origin corner. 8789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Actually we compute the coordinates of the center of the corner 8799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * histogram cell, which are the lower bounds of the volume we care about. 8809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 8819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project minc0 = (c0 << BOX_C0_SHIFT) + ((1 << C0_SHIFT) >> 1); 8829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project minc1 = (c1 << BOX_C1_SHIFT) + ((1 << C1_SHIFT) >> 1); 8839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project minc2 = (c2 << BOX_C2_SHIFT) + ((1 << C2_SHIFT) >> 1); 8849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Determine which colormap entries are close enough to be candidates 8869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * for the nearest entry to some cell in the update box. 8879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 8889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project numcolors = find_nearby_colors(cinfo, minc0, minc1, minc2, colorlist); 8899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Determine the actually nearest colors. */ 8919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project find_best_colors(cinfo, minc0, minc1, minc2, numcolors, colorlist, 8929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project bestcolor); 8939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Save the best color numbers (plus 1) in the main cache array */ 8959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c0 <<= BOX_C0_LOG; /* convert ID back to base cell indexes */ 8969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c1 <<= BOX_C1_LOG; 8979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c2 <<= BOX_C2_LOG; 8989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cptr = bestcolor; 8999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ic0 = 0; ic0 < BOX_C0_ELEMS; ic0++) { 9009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ic1 = 0; ic1 < BOX_C1_ELEMS; ic1++) { 9019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cachep = & histogram[c0+ic0][c1+ic1][c2]; 9029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ic2 = 0; ic2 < BOX_C2_ELEMS; ic2++) { 9039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *cachep++ = (histcell) (GETJSAMPLE(*cptr++) + 1); 9049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 9059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 9069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 9079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 9089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 9099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 9109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 9119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Map some rows of pixels to the output colormapped representation. 9129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 9139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 9149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 9159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectpass2_no_dither (j_decompress_ptr cinfo, 9169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows) 9179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* This version performs no dithering */ 9189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 9199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; 9209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project hist3d histogram = cquantize->histogram; 9219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register JSAMPROW inptr, outptr; 9229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register histptr cachep; 9239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int c0, c1, c2; 9249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int row; 9259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION col; 9269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION width = cinfo->output_width; 9279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 9289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (row = 0; row < num_rows; row++) { 9299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr = input_buf[row]; 9309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr = output_buf[row]; 9319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (col = width; col > 0; col--) { 9329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* get pixel value and index into the cache */ 9339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c0 = GETJSAMPLE(*inptr++) >> C0_SHIFT; 9349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c1 = GETJSAMPLE(*inptr++) >> C1_SHIFT; 9359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c2 = GETJSAMPLE(*inptr++) >> C2_SHIFT; 9369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cachep = & histogram[c0][c1][c2]; 9379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* If we have not seen this color before, find nearest colormap entry */ 9389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* and update the cache */ 9399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (*cachep == 0) 9409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project fill_inverse_cmap(cinfo, c0,c1,c2); 9419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Now emit the colormap index for this cell */ 9429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = (JSAMPLE) (*cachep - 1); 9439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 9449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 9459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 9469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 9479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 9489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 9499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectpass2_fs_dither (j_decompress_ptr cinfo, 9509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows) 9519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* This version performs Floyd-Steinberg dithering */ 9529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 9539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; 9549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project hist3d histogram = cquantize->histogram; 9559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register LOCFSERROR cur0, cur1, cur2; /* current error or pixel value */ 9569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project LOCFSERROR belowerr0, belowerr1, belowerr2; /* error for pixel below cur */ 9579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project LOCFSERROR bpreverr0, bpreverr1, bpreverr2; /* error for below/prev col */ 9589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register FSERRPTR errorptr; /* => fserrors[] at column before current */ 9599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPROW inptr; /* => current input pixel */ 9609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPROW outptr; /* => current output pixel */ 9619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project histptr cachep; 9629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int dir; /* +1 or -1 depending on direction */ 9639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int dir3; /* 3*dir, for advancing inptr & errorptr */ 9649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int row; 9659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION col; 9669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION width = cinfo->output_width; 9679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPLE *range_limit = cinfo->sample_range_limit; 9689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int *error_limit = cquantize->error_limiter; 9699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPROW colormap0 = cinfo->colormap[0]; 9709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPROW colormap1 = cinfo->colormap[1]; 9719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPROW colormap2 = cinfo->colormap[2]; 9729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project SHIFT_TEMPS 9739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 9749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (row = 0; row < num_rows; row++) { 9759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr = input_buf[row]; 9769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr = output_buf[row]; 9779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cquantize->on_odd_row) { 9789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* work right to left in this row */ 9799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr += (width-1) * 3; /* so point to rightmost pixel */ 9809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr += width-1; 9819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dir = -1; 9829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dir3 = -3; 9839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project errorptr = cquantize->fserrors + (width+1)*3; /* => entry after last column */ 9849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->on_odd_row = FALSE; /* flip for next time */ 9859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 9869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* work left to right in this row */ 9879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dir = 1; 9889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dir3 = 3; 9899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project errorptr = cquantize->fserrors; /* => entry before first real column */ 9909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->on_odd_row = TRUE; /* flip for next time */ 9919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 9929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Preset error values: no error propagated to first pixel from left */ 9939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur0 = cur1 = cur2 = 0; 9949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* and no error propagated to row below yet */ 9959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project belowerr0 = belowerr1 = belowerr2 = 0; 9969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project bpreverr0 = bpreverr1 = bpreverr2 = 0; 9979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 9989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (col = width; col > 0; col--) { 9999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* curN holds the error propagated from the previous pixel on the 10009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * current line. Add the error propagated from the previous line 10019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * to form the complete error correction term for this pixel, and 10029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * round the error term (which is expressed * 16) to an integer. 10039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * RIGHT_SHIFT rounds towards minus infinity, so adding 8 is correct 10049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * for either sign of the error value. 10059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Note: errorptr points to *previous* column's array entry. 10069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 10079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur0 = RIGHT_SHIFT(cur0 + errorptr[dir3+0] + 8, 4); 10089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur1 = RIGHT_SHIFT(cur1 + errorptr[dir3+1] + 8, 4); 10099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur2 = RIGHT_SHIFT(cur2 + errorptr[dir3+2] + 8, 4); 10109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Limit the error using transfer function set by init_error_limit. 10119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * See comments with init_error_limit for rationale. 10129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 10139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur0 = error_limit[cur0]; 10149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur1 = error_limit[cur1]; 10159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur2 = error_limit[cur2]; 10169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Form pixel value + error, and range-limit to 0..MAXJSAMPLE. 10179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The maximum error is +- MAXJSAMPLE (or less with error limiting); 10189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * this sets the required size of the range_limit array. 10199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 10209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur0 += GETJSAMPLE(inptr[0]); 10219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur1 += GETJSAMPLE(inptr[1]); 10229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur2 += GETJSAMPLE(inptr[2]); 10239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur0 = GETJSAMPLE(range_limit[cur0]); 10249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur1 = GETJSAMPLE(range_limit[cur1]); 10259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur2 = GETJSAMPLE(range_limit[cur2]); 10269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Index into the cache with adjusted pixel value */ 10279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cachep = & histogram[cur0>>C0_SHIFT][cur1>>C1_SHIFT][cur2>>C2_SHIFT]; 10289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* If we have not seen this color before, find nearest colormap */ 10299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* entry and update the cache */ 10309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (*cachep == 0) 10319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project fill_inverse_cmap(cinfo, cur0>>C0_SHIFT,cur1>>C1_SHIFT,cur2>>C2_SHIFT); 10329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Now emit the colormap index for this cell */ 10339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project { register int pixcode = *cachep - 1; 10349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr = (JSAMPLE) pixcode; 10359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Compute representation error for this pixel */ 10369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur0 -= GETJSAMPLE(colormap0[pixcode]); 10379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur1 -= GETJSAMPLE(colormap1[pixcode]); 10389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur2 -= GETJSAMPLE(colormap2[pixcode]); 10399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 10409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Compute error fractions to be propagated to adjacent pixels. 10419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Add these into the running sums, and simultaneously shift the 10429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * next-line error sums left by 1 column. 10439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 10449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project { register LOCFSERROR bnexterr, delta; 10459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 10469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project bnexterr = cur0; /* Process component 0 */ 10479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project delta = cur0 * 2; 10489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur0 += delta; /* form error * 3 */ 10499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project errorptr[0] = (FSERROR) (bpreverr0 + cur0); 10509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur0 += delta; /* form error * 5 */ 10519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project bpreverr0 = belowerr0 + cur0; 10529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project belowerr0 = bnexterr; 10539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur0 += delta; /* form error * 7 */ 10549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project bnexterr = cur1; /* Process component 1 */ 10559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project delta = cur1 * 2; 10569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur1 += delta; /* form error * 3 */ 10579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project errorptr[1] = (FSERROR) (bpreverr1 + cur1); 10589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur1 += delta; /* form error * 5 */ 10599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project bpreverr1 = belowerr1 + cur1; 10609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project belowerr1 = bnexterr; 10619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur1 += delta; /* form error * 7 */ 10629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project bnexterr = cur2; /* Process component 2 */ 10639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project delta = cur2 * 2; 10649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur2 += delta; /* form error * 3 */ 10659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project errorptr[2] = (FSERROR) (bpreverr2 + cur2); 10669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur2 += delta; /* form error * 5 */ 10679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project bpreverr2 = belowerr2 + cur2; 10689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project belowerr2 = bnexterr; 10699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cur2 += delta; /* form error * 7 */ 10709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 10719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* At this point curN contains the 7/16 error value to be propagated 10729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * to the next pixel on the current line, and all the errors for the 10739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * next line have been shifted over. We are therefore ready to move on. 10749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 10759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr += dir3; /* Advance pixel pointers to next column */ 10769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr += dir; 10779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project errorptr += dir3; /* advance errorptr to current column */ 10789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 10799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Post-loop cleanup: we must unload the final error values into the 10809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * final fserrors[] entry. Note we need not unload belowerrN because 10819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * it is for the dummy column before or after the actual array. 10829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 10839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project errorptr[0] = (FSERROR) bpreverr0; /* unload prev errs into array */ 10849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project errorptr[1] = (FSERROR) bpreverr1; 10859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project errorptr[2] = (FSERROR) bpreverr2; 10869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 10879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 10889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 10899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 10909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 10919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Initialize the error-limiting transfer function (lookup table). 10929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The raw F-S error computation can potentially compute error values of up to 10939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * +- MAXJSAMPLE. But we want the maximum correction applied to a pixel to be 10949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * much less, otherwise obviously wrong pixels will be created. (Typical 10959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * effects include weird fringes at color-area boundaries, isolated bright 10969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * pixels in a dark area, etc.) The standard advice for avoiding this problem 10979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * is to ensure that the "corners" of the color cube are allocated as output 10989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * colors; then repeated errors in the same direction cannot cause cascading 10999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * error buildup. However, that only prevents the error from getting 11009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * completely out of hand; Aaron Giles reports that error limiting improves 11019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the results even with corner colors allocated. 11029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * A simple clamping of the error values to about +- MAXJSAMPLE/8 works pretty 11039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * well, but the smoother transfer function used below is even better. Thanks 11049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * to Aaron Giles for this idea. 11059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 11069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 11089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectinit_error_limit (j_decompress_ptr cinfo) 11099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Allocate and fill in the error_limiter table */ 11109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 11119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; 11129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int * table; 11139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int in, out; 11149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project table = (int *) (*cinfo->mem->alloc_small) 11169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE*2+1) * SIZEOF(int)); 11179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project table += MAXJSAMPLE; /* so can index -MAXJSAMPLE .. +MAXJSAMPLE */ 11189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->error_limiter = table; 11199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define STEPSIZE ((MAXJSAMPLE+1)/16) 11219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Map errors 1:1 up to +- MAXJSAMPLE/16 */ 11229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project out = 0; 11239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (in = 0; in < STEPSIZE; in++, out++) { 11249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project table[in] = out; table[-in] = -out; 11259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 11269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Map errors 1:2 up to +- 3*MAXJSAMPLE/16 */ 11279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (; in < STEPSIZE*3; in++, out += (in&1) ? 0 : 1) { 11289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project table[in] = out; table[-in] = -out; 11299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 11309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Clamp the rest to final out value (which is (MAXJSAMPLE+1)/8) */ 11319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (; in <= MAXJSAMPLE; in++) { 11329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project table[in] = out; table[-in] = -out; 11339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 11349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#undef STEPSIZE 11359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 11369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 11399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Finish up at the end of each pass. 11409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 11419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 11439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectfinish_pass1 (j_decompress_ptr cinfo) 11449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 11459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; 11469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Select the representative colors and fill in cinfo->colormap */ 11489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->colormap = cquantize->sv_colormap; 11499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project select_colors(cinfo, cquantize->desired); 11509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Force next pass to zero the color index table */ 11519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->needs_zeroed = TRUE; 11529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 11539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 11569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectfinish_pass2 (j_decompress_ptr cinfo) 11579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 11589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* no work */ 11599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 11609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 11639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Initialize for each processing pass. 11649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 11659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 11679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstart_pass_2_quant (j_decompress_ptr cinfo, boolean is_pre_scan) 11689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 11699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; 11709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project hist3d histogram = cquantize->histogram; 11719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int i; 11729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Only F-S dithering or no dithering is supported. */ 11749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* If user asks for ordered dither, give him F-S. */ 11759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->dither_mode != JDITHER_NONE) 11769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->dither_mode = JDITHER_FS; 11779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (is_pre_scan) { 11799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Set up method pointers */ 11809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->pub.color_quantize = prescan_quantize; 11819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->pub.finish_pass = finish_pass1; 11829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->needs_zeroed = TRUE; /* Always zero histogram */ 11839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 11849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Set up method pointers */ 11859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->dither_mode == JDITHER_FS) 11869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->pub.color_quantize = pass2_fs_dither; 11879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project else 11889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->pub.color_quantize = pass2_no_dither; 11899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->pub.finish_pass = finish_pass2; 11909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Make sure color count is acceptable */ 11929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project i = cinfo->actual_number_of_colors; 11939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (i < 1) 11949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT1(cinfo, JERR_QUANT_FEW_COLORS, 1); 11959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (i > MAXNUMCOLORS) 11969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT1(cinfo, JERR_QUANT_MANY_COLORS, MAXNUMCOLORS); 11979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 11989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->dither_mode == JDITHER_FS) { 11999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project size_t arraysize = (size_t) ((cinfo->output_width + 2) * 12009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (3 * SIZEOF(FSERROR))); 12019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Allocate Floyd-Steinberg workspace if we didn't already. */ 12029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cquantize->fserrors == NULL) 12039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->fserrors = (FSERRPTR) (*cinfo->mem->alloc_large) 12049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((j_common_ptr) cinfo, JPOOL_IMAGE, arraysize); 12059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Initialize the propagated errors to zero. */ 12069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jzero_far((void FAR *) cquantize->fserrors, arraysize); 12079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Make the error-limit table if we didn't already. */ 12089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cquantize->error_limiter == NULL) 12099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project init_error_limit(cinfo); 12109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->on_odd_row = FALSE; 12119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 12129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 12139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 12149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Zero the histogram or inverse color map, if necessary */ 12159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cquantize->needs_zeroed) { 12169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0; i < HIST_C0_ELEMS; i++) { 12179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jzero_far((void FAR *) histogram[i], 12189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project HIST_C1_ELEMS*HIST_C2_ELEMS * SIZEOF(histcell)); 12199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 12209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->needs_zeroed = FALSE; 12219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 12229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 12239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 12249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 12259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 12269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Switch to a new external colormap between output passes. 12279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 12289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 12299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 12309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectnew_color_map_2_quant (j_decompress_ptr cinfo) 12319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 12329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; 12339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 12349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Reset the inverse color map */ 12359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->needs_zeroed = TRUE; 12369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 12379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 12389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 12399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 12409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Module initialization routine for 2-pass color quantization. 12419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 12429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 12439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(void) 12449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjinit_2pass_quantizer (j_decompress_ptr cinfo) 12459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 12469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_cquantize_ptr cquantize; 12479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int i; 12489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 12499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize = (my_cquantize_ptr) 12509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 12519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project SIZEOF(my_cquantizer)); 12529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->cquantize = (struct jpeg_color_quantizer *) cquantize; 12539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->pub.start_pass = start_pass_2_quant; 12549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->pub.new_color_map = new_color_map_2_quant; 12559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->fserrors = NULL; /* flag optional arrays not allocated */ 12569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->error_limiter = NULL; 12579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 12589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Make sure jdmaster didn't give me a case I can't handle */ 12599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->out_color_components != 3) 12609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(cinfo, JERR_NOTIMPL); 12619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 12629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Allocate the histogram/inverse colormap storage */ 12639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->histogram = (hist3d) (*cinfo->mem->alloc_small) 12649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((j_common_ptr) cinfo, JPOOL_IMAGE, HIST_C0_ELEMS * SIZEOF(hist2d)); 12659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0; i < HIST_C0_ELEMS; i++) { 12669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->histogram[i] = (hist2d) (*cinfo->mem->alloc_large) 12679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((j_common_ptr) cinfo, JPOOL_IMAGE, 12689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project HIST_C1_ELEMS*HIST_C2_ELEMS * SIZEOF(histcell)); 12699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 12709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->needs_zeroed = TRUE; /* histogram is garbage now */ 12719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 12729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Allocate storage for the completed colormap, if required. 12739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We do this now since it is FAR storage and may affect 12749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the memory manager's space calculations. 12759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 12769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->enable_2pass_quant) { 12779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Make sure color count is acceptable */ 12789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int desired = cinfo->desired_number_of_colors; 12799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Lower bound on # of colors ... somewhat arbitrary as long as > 0 */ 12809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (desired < 8) 12819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT1(cinfo, JERR_QUANT_FEW_COLORS, 8); 12829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Make sure colormap indexes can be represented by JSAMPLEs */ 12839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (desired > MAXNUMCOLORS) 12849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT1(cinfo, JERR_QUANT_MANY_COLORS, MAXNUMCOLORS); 12859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->sv_colormap = (*cinfo->mem->alloc_sarray) 12869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((j_common_ptr) cinfo,JPOOL_IMAGE, (JDIMENSION) desired, (JDIMENSION) 3); 12879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->desired = desired; 12889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else 12899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->sv_colormap = NULL; 12909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 12919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Only F-S dithering or no dithering is supported. */ 12929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* If user asks for ordered dither, give him F-S. */ 12939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->dither_mode != JDITHER_NONE) 12949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->dither_mode = JDITHER_FS; 12959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 12969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Allocate Floyd-Steinberg workspace if necessary. 12979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This isn't really needed until pass 2, but again it is FAR storage. 12989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Although we will cope with a later change in dither_mode, 12999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * we do not promise to honor max_memory_to_use if dither_mode changes. 13009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 13019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->dither_mode == JDITHER_FS) { 13029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cquantize->fserrors = (FSERRPTR) (*cinfo->mem->alloc_large) 13039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((j_common_ptr) cinfo, JPOOL_IMAGE, 13049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (size_t) ((cinfo->output_width + 2) * (3 * SIZEOF(FSERROR)))); 13059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Might as well create the error-limiting table too. */ 13069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project init_error_limit(cinfo); 13079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 13089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 13099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 13109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif /* QUANT_2PASS_SUPPORTED */ 1311