19f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 29f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jdmainct.c 39f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 49f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Copyright (C) 1994-1996, 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 the main buffer controller for decompression. 99f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The main buffer lies between the JPEG decompressor proper and the 109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * post-processor; it holds downsampled data in the JPEG colorspace. 119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Note that this code is bypassed in raw-data mode, since the application 139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * supplies the equivalent of the main buffer in that case. 149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define JPEG_INTERNALS 179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jinclude.h" 189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jpeglib.h" 199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * In the current system design, the main buffer need never be a full-image 239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * buffer; any full-height buffers will be found inside the coefficient or 249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * postprocessing controllers. Nonetheless, the main controller is not 259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * trivial. Its responsibility is to provide context rows for upsampling/ 269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * rescaling, and doing this in an efficient fashion is a bit tricky. 279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Postprocessor input data is counted in "row groups". A row group 299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * is defined to be (v_samp_factor * DCT_scaled_size / min_DCT_scaled_size) 309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * sample rows of each component. (We require DCT_scaled_size values to be 319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * chosen such that these numbers are integers. In practice DCT_scaled_size 329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * values will likely be powers of two, so we actually have the stronger 339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * condition that DCT_scaled_size / min_DCT_scaled_size is an integer.) 349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Upsampling will typically produce max_v_samp_factor pixel rows from each 359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * row group (times any additional scale factor that the upsampler is 369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * applying). 379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The coefficient controller will deliver data to us one iMCU row at a time; 399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * each iMCU row contains v_samp_factor * DCT_scaled_size sample rows, or 409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * exactly min_DCT_scaled_size row groups. (This amount of data corresponds 419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * to one row of MCUs when the image is fully interleaved.) Note that the 429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * number of sample rows varies across components, but the number of row 439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * groups does not. Some garbage sample rows may be included in the last iMCU 449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * row at the bottom of the image. 459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Depending on the vertical scaling algorithm used, the upsampler may need 479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * access to the sample row(s) above and below its current input row group. 489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The upsampler is required to set need_context_rows TRUE at global selection 499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * time if so. When need_context_rows is FALSE, this controller can simply 509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * obtain one iMCU row at a time from the coefficient controller and dole it 519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * out as row groups to the postprocessor. 529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * When need_context_rows is TRUE, this controller guarantees that the buffer 549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * passed to postprocessing contains at least one row group's worth of samples 559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * above and below the row group(s) being processed. Note that the context 569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * rows "above" the first passed row group appear at negative row offsets in 579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the passed buffer. At the top and bottom of the image, the required 589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * context rows are manufactured by duplicating the first or last real sample 599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * row; this avoids having special cases in the upsampling inner loops. 609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The amount of context is fixed at one row group just because that's a 629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * convenient number for this controller to work with. The existing 639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * upsamplers really only need one sample row of context. An upsampler 649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * supporting arbitrary output rescaling might wish for more than one row 659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * group of context when shrinking the image; tough, we don't handle that. 669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (This is justified by the assumption that downsizing will be handled mostly 679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * by adjusting the DCT_scaled_size values, so that the actual scale factor at 689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the upsample step needn't be much less than one.) 699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * To provide the desired context, we have to retain the last two row groups 719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * of one iMCU row while reading in the next iMCU row. (The last row group 729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * can't be processed until we have another row group for its below-context, 739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * and so we have to save the next-to-last group too for its above-context.) 749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We could do this most simply by copying data around in our buffer, but 759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * that'd be very slow. We can avoid copying any data by creating a rather 769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * strange pointer structure. Here's how it works. We allocate a workspace 779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * consisting of M+2 row groups (where M = min_DCT_scaled_size is the number 789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * of row groups per iMCU row). We create two sets of redundant pointers to 799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the workspace. Labeling the physical row groups 0 to M+1, the synthesized 809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * pointer lists look like this: 819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * M+1 M-1 829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * master pointer --> 0 master pointer --> 0 839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1 1 849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * ... ... 859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * M-3 M-3 869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * M-2 M 879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * M-1 M+1 889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * M M-2 899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * M+1 M-1 909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 0 0 919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We read alternate iMCU rows using each master pointer; thus the last two 929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * row groups of the previous iMCU row remain un-overwritten in the workspace. 939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The pointer lists are set up so that the required context rows appear to 949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * be adjacent to the proper places when we pass the pointer lists to the 959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * upsampler. 969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The above pictures describe the normal state of the pointer lists. 989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * At top and bottom of the image, we diddle the pointer lists to duplicate 999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the first or last sample row as necessary (this is cheaper than copying 1009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * sample rows around). 1019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This scheme breaks down if M < 2, ie, min_DCT_scaled_size is 1. In that 1039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * situation each iMCU row provides only one row group so the buffering logic 1049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * must be different (eg, we must read two iMCU rows before we can emit the 1059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * first row group). For now, we simply do not support providing context 1069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * rows when min_DCT_scaled_size is 1. That combination seems unlikely to 1079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * be worth providing --- if someone wants a 1/8th-size preview, they probably 1089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * want it quick and dirty, so a context-free upsampler is sufficient. 1099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Private buffer controller object */ 1139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef struct { 1159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project struct jpeg_d_main_controller pub; /* public fields */ 1169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Pointer to allocated workspace (M or M+2 row groups). */ 1189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY buffer[MAX_COMPONENTS]; 1199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boolean buffer_full; /* Have we gotten an iMCU row from decoder? */ 1219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION rowgroup_ctr; /* counts row groups output to postprocessor */ 1229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Remaining fields are only used in the context case. */ 1249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* These are the master pointers to the funny-order pointer lists. */ 1269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPIMAGE xbuffer[2]; /* pointers to weird pointer lists */ 1279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int whichptr; /* indicates which pointer set is now in use */ 1299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int context_state; /* process_data state machine status */ 1309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION rowgroups_avail; /* row groups available to postprocessor */ 1319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION iMCU_row_ctr; /* counts iMCU rows to detect image top/bot */ 1329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} my_main_controller; 1339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef my_main_controller * my_main_ptr; 1359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* context_state values: */ 1379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define CTX_PREPARE_FOR_IMCU 0 /* need to prepare for MCU row */ 1389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define CTX_PROCESS_IMCU 1 /* feeding iMCU to postprocessor */ 1399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define CTX_POSTPONED_ROW 2 /* feeding postponed row group */ 1409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Forward declarations */ 1439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) process_data_simple_main 1449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JPP((j_decompress_ptr cinfo, JSAMPARRAY output_buf, 1459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)); 1469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) process_data_context_main 1479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JPP((j_decompress_ptr cinfo, JSAMPARRAY output_buf, 1489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)); 1499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef QUANT_2PASS_SUPPORTED 1509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) process_data_crank_post 1519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JPP((j_decompress_ptr cinfo, JSAMPARRAY output_buf, 1529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)); 1539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 1549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 1579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectalloc_funny_pointers (j_decompress_ptr cinfo) 1589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Allocate space for the funny pointer lists. 1599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This is done only once, not once per pass. 1609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_main_ptr main = (my_main_ptr) cinfo->main; 1639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci, rgroup; 1649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int M = cinfo->min_DCT_scaled_size; 1659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info *compptr; 1669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY xbuf; 1679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Get top-level space for component array pointers. 1699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We alloc both arrays with one call to save a few cycles. 1709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->xbuffer[0] = (JSAMPIMAGE) 1729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 1739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->num_components * 2 * SIZEOF(JSAMPARRAY)); 1749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->xbuffer[1] = main->xbuffer[0] + cinfo->num_components; 1759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 1779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ci++, compptr++) { 1789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) / 1799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->min_DCT_scaled_size; /* height of a row group of component */ 1809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Get space for pointer lists --- M+4 row groups in each list. 1819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We alloc both pointer lists with one call to save a few cycles. 1829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf = (JSAMPARRAY) 1849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 1859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2 * (rgroup * (M + 4)) * SIZEOF(JSAMPROW)); 1869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf += rgroup; /* want one row group at negative offsets */ 1879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->xbuffer[0][ci] = xbuf; 1889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf += rgroup * (M + 4); 1899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->xbuffer[1][ci] = xbuf; 1909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 1929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 1959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectmake_funny_pointers (j_decompress_ptr cinfo) 1969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Create the funny pointer lists discussed in the comments above. 1979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The actual workspace is already allocated (in main->buffer), 1989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * and the space for the pointer lists is allocated too. 1999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This routine just fills in the curiously ordered lists. 2009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This will be repeated at the beginning of each pass. 2019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_main_ptr main = (my_main_ptr) cinfo->main; 2049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci, i, rgroup; 2059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int M = cinfo->min_DCT_scaled_size; 2069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info *compptr; 2079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY buf, xbuf0, xbuf1; 2089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 2109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ci++, compptr++) { 2119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) / 2129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->min_DCT_scaled_size; /* height of a row group of component */ 2139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf0 = main->xbuffer[0][ci]; 2149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf1 = main->xbuffer[1][ci]; 2159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* First copy the workspace pointers as-is */ 2169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project buf = main->buffer[ci]; 2179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0; i < rgroup * (M + 2); i++) { 2189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf0[i] = xbuf1[i] = buf[i]; 2199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* In the second list, put the last four row groups in swapped order */ 2219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0; i < rgroup * 2; i++) { 2229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf1[rgroup*(M-2) + i] = buf[rgroup*M + i]; 2239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf1[rgroup*M + i] = buf[rgroup*(M-2) + i]; 2249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* The wraparound pointers at top and bottom will be filled later 2269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (see set_wraparound_pointers, below). Initially we want the "above" 2279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * pointers to duplicate the first actual data line. This only needs 2289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * to happen in xbuffer[0]. 2299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0; i < rgroup; i++) { 2319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf0[i - rgroup] = xbuf0[0]; 2329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 2389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectset_wraparound_pointers (j_decompress_ptr cinfo) 2399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Set up the "wraparound" pointers at top and bottom of the pointer lists. 2409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This changes the pointer list state from top-of-image to the normal state. 2419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_main_ptr main = (my_main_ptr) cinfo->main; 2449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci, i, rgroup; 2459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int M = cinfo->min_DCT_scaled_size; 2469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info *compptr; 2479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY xbuf0, xbuf1; 2489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 2509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ci++, compptr++) { 2519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) / 2529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->min_DCT_scaled_size; /* height of a row group of component */ 2539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf0 = main->xbuffer[0][ci]; 2549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf1 = main->xbuffer[1][ci]; 2559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0; i < rgroup; i++) { 2569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf0[i - rgroup] = xbuf0[rgroup*(M+1) + i]; 2579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf1[i - rgroup] = xbuf1[rgroup*(M+1) + i]; 2589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf0[rgroup*(M+2) + i] = xbuf0[i]; 2599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf1[rgroup*(M+2) + i] = xbuf1[i]; 2609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 2669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectset_bottom_pointers (j_decompress_ptr cinfo) 2679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Change the pointer lists to duplicate the last sample row at the bottom 2689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * of the image. whichptr indicates which xbuffer holds the final iMCU row. 2699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Also sets rowgroups_avail to indicate number of nondummy row groups in row. 2709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_main_ptr main = (my_main_ptr) cinfo->main; 2739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci, i, rgroup, iMCUheight, rows_left; 2749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info *compptr; 2759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY xbuf; 2769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 2789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ci++, compptr++) { 2799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Count sample rows in one iMCU row and in one row group */ 2809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project iMCUheight = compptr->v_samp_factor * compptr->DCT_scaled_size; 2819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project rgroup = iMCUheight / cinfo->min_DCT_scaled_size; 2829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Count nondummy sample rows remaining for this component */ 2839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project rows_left = (int) (compptr->downsampled_height % (JDIMENSION) iMCUheight); 2849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (rows_left == 0) rows_left = iMCUheight; 2859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Count nondummy row groups. Should get same answer for each component, 2869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * so we need only do it once. 2879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (ci == 0) { 2899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->rowgroups_avail = (JDIMENSION) ((rows_left-1) / rgroup + 1); 2909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Duplicate the last real sample row rgroup*2 times; this pads out the 2929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * last partial rowgroup and ensures at least one full rowgroup of context. 2939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf = main->xbuffer[main->whichptr][ci]; 2959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0; i < rgroup * 2; i++) { 2969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project xbuf[rows_left + i] = xbuf[rows_left-1]; 2979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 3039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Initialize for a processing pass. 3049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 3079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstart_pass_main (j_decompress_ptr cinfo, J_BUF_MODE pass_mode) 3089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_main_ptr main = (my_main_ptr) cinfo->main; 3109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project switch (pass_mode) { 3129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case JBUF_PASS_THRU: 3139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->upsample->need_context_rows) { 3149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->pub.process_data = process_data_context_main; 3159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project make_funny_pointers(cinfo); /* Create the xbuffer[] lists */ 3169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->whichptr = 0; /* Read first iMCU row into xbuffer[0] */ 3179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->context_state = CTX_PREPARE_FOR_IMCU; 3189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->iMCU_row_ctr = 0; 3199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 3209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Simple case with no context needed */ 3219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->pub.process_data = process_data_simple_main; 3229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->buffer_full = FALSE; /* Mark buffer empty */ 3249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->rowgroup_ctr = 0; 3259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project break; 3269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef QUANT_2PASS_SUPPORTED 3279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case JBUF_CRANK_DEST: 3289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* For last pass of 2-pass quantization, just crank the postprocessor */ 3299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->pub.process_data = process_data_crank_post; 3309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project break; 3319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 3329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project default: 3339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); 3349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project break; 3359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 3409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Process some data. 3419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This handles the simple case where no context is required. 3429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 3459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectprocess_data_simple_main (j_decompress_ptr cinfo, 3469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, 3479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION out_rows_avail) 3489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_main_ptr main = (my_main_ptr) cinfo->main; 3509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION rowgroups_avail; 3519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Read input data if we haven't filled the main buffer yet */ 3539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! main->buffer_full) { 3549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! (*cinfo->coef->decompress_data) (cinfo, main->buffer)) 3559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return; /* suspension forced, can do nothing more */ 3569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->buffer_full = TRUE; /* OK, we have an iMCU row to work with */ 3579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* There are always min_DCT_scaled_size row groups in an iMCU row. */ 3609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project rowgroups_avail = (JDIMENSION) cinfo->min_DCT_scaled_size; 3619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Note: at the bottom of the image, we may pass extra garbage row groups 3629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * to the postprocessor. The postprocessor has to check for bottom 3639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * of image anyway (at row resolution), so no point in us doing it too. 3649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Feed the postprocessor */ 3679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->post->post_process_data) (cinfo, main->buffer, 3689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project &main->rowgroup_ctr, rowgroups_avail, 3699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_buf, out_row_ctr, out_rows_avail); 3709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Has postprocessor consumed all the data yet? If so, mark buffer empty */ 3729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (main->rowgroup_ctr >= rowgroups_avail) { 3739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->buffer_full = FALSE; 3749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->rowgroup_ctr = 0; 3759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 3809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Process some data. 3819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This handles the case where context rows must be provided. 3829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 3859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectprocess_data_context_main (j_decompress_ptr cinfo, 3869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, 3879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION out_rows_avail) 3889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_main_ptr main = (my_main_ptr) cinfo->main; 3909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Read input data if we haven't filled the main buffer yet */ 3929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! main->buffer_full) { 3939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! (*cinfo->coef->decompress_data) (cinfo, 3949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->xbuffer[main->whichptr])) 3959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return; /* suspension forced, can do nothing more */ 3969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->buffer_full = TRUE; /* OK, we have an iMCU row to work with */ 3979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->iMCU_row_ctr++; /* count rows received */ 3989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Postprocessor typically will not swallow all the input data it is handed 4019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * in one call (due to filling the output buffer first). Must be prepared 4029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * to exit and restart. This switch lets us keep track of how far we got. 4039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Note that each case falls through to the next on successful completion. 4049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project switch (main->context_state) { 4069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case CTX_POSTPONED_ROW: 4079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Call postprocessor using previously set pointers for postponed row */ 4089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->post->post_process_data) (cinfo, main->xbuffer[main->whichptr], 4099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project &main->rowgroup_ctr, main->rowgroups_avail, 4109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_buf, out_row_ctr, out_rows_avail); 4119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (main->rowgroup_ctr < main->rowgroups_avail) 4129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return; /* Need to suspend */ 4139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->context_state = CTX_PREPARE_FOR_IMCU; 4149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (*out_row_ctr >= out_rows_avail) 4159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return; /* Postprocessor exactly filled output buf */ 4169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /*FALLTHROUGH*/ 4179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case CTX_PREPARE_FOR_IMCU: 4189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Prepare to process first M-1 row groups of this iMCU row */ 4199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->rowgroup_ctr = 0; 4209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->rowgroups_avail = (JDIMENSION) (cinfo->min_DCT_scaled_size - 1); 4219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Check for bottom of image: if so, tweak pointers to "duplicate" 4229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the last sample row, and adjust rowgroups_avail to ignore padding rows. 4239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (main->iMCU_row_ctr == cinfo->total_iMCU_rows) 4259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project set_bottom_pointers(cinfo); 4269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->context_state = CTX_PROCESS_IMCU; 4279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /*FALLTHROUGH*/ 4289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project case CTX_PROCESS_IMCU: 4299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Call postprocessor using previously set pointers */ 4309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->post->post_process_data) (cinfo, main->xbuffer[main->whichptr], 4319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project &main->rowgroup_ctr, main->rowgroups_avail, 4329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_buf, out_row_ctr, out_rows_avail); 4339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (main->rowgroup_ctr < main->rowgroups_avail) 4349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return; /* Need to suspend */ 4359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* After the first iMCU, change wraparound pointers to normal state */ 4369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (main->iMCU_row_ctr == 1) 4379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project set_wraparound_pointers(cinfo); 4389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Prepare to load new iMCU row using other xbuffer list */ 4399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->whichptr ^= 1; /* 0=>1 or 1=>0 */ 4409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->buffer_full = FALSE; 4419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Still need to process last row group of this iMCU row, */ 4429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* which is saved at index M+1 of the other xbuffer */ 4439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->rowgroup_ctr = (JDIMENSION) (cinfo->min_DCT_scaled_size + 1); 4449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->rowgroups_avail = (JDIMENSION) (cinfo->min_DCT_scaled_size + 2); 4459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->context_state = CTX_POSTPONED_ROW; 4469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 4489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 4519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Process some data. 4529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Final pass of two-pass quantization: just call the postprocessor. 4539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Source data will be the postprocessor controller's internal buffer. 4549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef QUANT_2PASS_SUPPORTED 4579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 4599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectprocess_data_crank_post (j_decompress_ptr cinfo, 4609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, 4619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION out_rows_avail) 4629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 4639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->post->post_process_data) (cinfo, (JSAMPIMAGE) NULL, 4649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (JDIMENSION *) NULL, (JDIMENSION) 0, 4659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_buf, out_row_ctr, out_rows_avail); 4669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 4679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif /* QUANT_2PASS_SUPPORTED */ 4699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 4729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Initialize main buffer controller. 4739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(void) 4769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjinit_d_main_controller (j_decompress_ptr cinfo, boolean need_full_buffer) 4779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 4789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_main_ptr main; 4799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci, rgroup, ngroups; 4809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info *compptr; 4819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main = (my_main_ptr) 4839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 4849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project SIZEOF(my_main_controller)); 4859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->main = (struct jpeg_d_main_controller *) main; 4869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->pub.start_pass = start_pass_main; 4879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (need_full_buffer) /* shouldn't happen */ 4899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); 4909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Allocate the workspace. 4929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * ngroups is the number of row groups we need. 4939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->upsample->need_context_rows) { 4959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->min_DCT_scaled_size < 2) /* unsupported, see comments above */ 4969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(cinfo, JERR_NOTIMPL); 4979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project alloc_funny_pointers(cinfo); /* Alloc space for xbuffer[] lists */ 4989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ngroups = cinfo->min_DCT_scaled_size + 2; 4999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 5009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ngroups = cinfo->min_DCT_scaled_size; 5019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 5049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ci++, compptr++) { 5059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) / 5069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->min_DCT_scaled_size; /* height of a row group of component */ 5079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project main->buffer[ci] = (*cinfo->mem->alloc_sarray) 5089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((j_common_ptr) cinfo, JPOOL_IMAGE, 5099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project compptr->width_in_blocks * compptr->DCT_scaled_size, 5109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (JDIMENSION) (rgroup * ngroups)); 5119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 513