19f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 29f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jdsample.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 upsampling routines. 99f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Upsampling input data is counted in "row groups". A row group 119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * is defined to be (v_samp_factor * DCT_scaled_size / min_DCT_scaled_size) 129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * sample rows of each component. Upsampling will normally produce 139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * max_v_samp_factor pixel rows from each row group (but this could vary 149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * if the upsampler is applying a scale factor of its own). 159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * An excellent reference for image resampling is 179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Digital Image Warping, George Wolberg, 1990. 189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Pub. by IEEE Computer Society Press, Los Alamitos, CA. ISBN 0-8186-8944-7. 199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define JPEG_INTERNALS 229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jinclude.h" 239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jpeglib.h" 249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Pointer to routine to upsample a single component */ 279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef JMETHOD(void, upsample1_ptr, 289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (j_decompress_ptr cinfo, jpeg_component_info * compptr, 299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)); 309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Private subobject */ 329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef struct { 349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project struct jpeg_upsampler pub; /* public fields */ 359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Color conversion buffer. When using separate upsampling and color 379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * conversion steps, this buffer holds one upsampled row group until it 389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * has been color converted and output. 399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Note: we do not allocate any storage for component(s) which are full-size, 409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * ie do not need rescaling. The corresponding entry of color_buf[] is 419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * simply set to point to the input data array, thereby avoiding copying. 429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY color_buf[MAX_COMPONENTS]; 449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Per-component upsampling method pointers */ 469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample1_ptr methods[MAX_COMPONENTS]; 479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int next_row_out; /* counts rows emitted from color_buf */ 499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION rows_to_go; /* counts rows remaining in image */ 509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Height of an input row group for each component. */ 529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int rowgroup_height[MAX_COMPONENTS]; 539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* These arrays save pixel expansion factors so that int_expand need not 559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * recompute them each time. They are unused for other upsampling methods. 569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project UINT8 h_expand[MAX_COMPONENTS]; 589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project UINT8 v_expand[MAX_COMPONENTS]; 599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} my_upsampler; 609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef my_upsampler * my_upsample_ptr; 629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Initialize for an upsampling pass. 669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstart_pass_upsample (j_decompress_ptr cinfo) 709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; 729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Mark the conversion buffer empty */ 749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->next_row_out = cinfo->max_v_samp_factor; 759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Initialize total-height counter for detecting bottom of image */ 769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->rows_to_go = cinfo->output_height; 779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Control routine to do upsampling (and color conversion). 829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * In this version we upsample each component independently. 849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We upsample one row group into the conversion buffer, then apply 859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * color conversion a row at a time. 869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectsep_upsample (j_decompress_ptr cinfo, 909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr, 919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION in_row_groups_avail, 929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, 939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION out_rows_avail) 949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; 969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci; 979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info * compptr; 989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION num_rows; 999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Fill the conversion buffer, if it's empty */ 1019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (upsample->next_row_out >= cinfo->max_v_samp_factor) { 1029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 1039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ci++, compptr++) { 1049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Invoke per-component upsample method. Notice we pass a POINTER 1059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * to color_buf[ci], so that fullsize_upsample can change it. 1069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*upsample->methods[ci]) (cinfo, compptr, 1089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project input_buf[ci] + (*in_row_group_ctr * upsample->rowgroup_height[ci]), 1099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->color_buf + ci); 1109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->next_row_out = 0; 1129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Color-convert and emit rows */ 1159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* How many we have in the buffer: */ 1179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project num_rows = (JDIMENSION) (cinfo->max_v_samp_factor - upsample->next_row_out); 1189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Not more than the distance to the end of the image. Need this test 1199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * in case the image height is not a multiple of max_v_samp_factor: 1209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (num_rows > upsample->rows_to_go) 1229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project num_rows = upsample->rows_to_go; 1239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* And not more than what the client can accept: */ 1249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project out_rows_avail -= *out_row_ctr; 1259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (num_rows > out_rows_avail) 1269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project num_rows = out_rows_avail; 1279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->cconvert->color_convert) (cinfo, upsample->color_buf, 1299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (JDIMENSION) upsample->next_row_out, 1309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_buf + *out_row_ctr, 1319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (int) num_rows); 1329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Adjust counts */ 1349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *out_row_ctr += num_rows; 1359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->rows_to_go -= num_rows; 1369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->next_row_out += num_rows; 1379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* When the buffer is emptied, declare this input row group consumed */ 1389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (upsample->next_row_out >= cinfo->max_v_samp_factor) 1399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*in_row_group_ctr)++; 1409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 1419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * These are the routines invoked by sep_upsample to upsample pixel values 1459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * of a single component. One row group is processed per call. 1469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * For full-size components, we just make color_buf[ci] point at the 1519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * input buffer, and thus avoid copying any data. Note that this is 1529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * safe only because sep_upsample doesn't declare the input row group 1539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * "consumed" until we are done color converting and emitting it. 1549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 1579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectfullsize_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr, 1589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr) 1599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *output_data_ptr = input_data; 1619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 1629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This is a no-op version used for "uninteresting" components. 1669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * These components will not be referenced by color conversion. 1679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 1709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectnoop_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr, 1719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr) 1729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *output_data_ptr = NULL; /* safety check */ 1749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 1759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This version handles any integral sampling ratios. 1799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This is not used for typical JPEG files, so it need not be fast. 1809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Nor, for that matter, is it particularly accurate: the algorithm is 1819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * simple replication of the input pixel onto the corresponding output 1829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * pixels. The hi-falutin sampling literature refers to this as a 1839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * "box filter". A box filter tends to introduce visible artifacts, 1849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * so if you are actually going to use 3:1 or 4:1 sampling ratios 1859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * you would be well advised to improve this code. 1869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 1899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectint_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr, 1909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr) 1919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; 1939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_data = *output_data_ptr; 1949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register JSAMPROW inptr, outptr; 1959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register JSAMPLE invalue; 1969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int h; 1979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPROW outend; 1989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int h_expand, v_expand; 1999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int inrow, outrow; 2009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project h_expand = upsample->h_expand[compptr->component_index]; 2029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project v_expand = upsample->v_expand[compptr->component_index]; 2039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inrow = outrow = 0; 2059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (outrow < cinfo->max_v_samp_factor) { 2069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Generate one output row with proper horizontal expansion */ 2079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr = input_data[inrow]; 2089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr = output_data[outrow]; 2099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outend = outptr + cinfo->output_width; 2109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (outptr < outend) { 2119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project invalue = *inptr++; /* don't need GETJSAMPLE() here */ 2129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (h = h_expand; h > 0; h--) { 2139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = invalue; 2149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Generate any additional output rows by duplicating the first one */ 2179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (v_expand > 1) { 2189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jcopy_sample_rows(output_data, outrow, output_data, outrow+1, 2199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project v_expand-1, cinfo->output_width); 2209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inrow++; 2229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outrow += v_expand; 2239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 2289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Fast processing for the common case of 2:1 horizontal and 1:1 vertical. 2299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * It's still a box filter. 2309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 2339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecth2v1_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr, 2349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr) 2359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_data = *output_data_ptr; 2379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register JSAMPROW inptr, outptr; 2389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register JSAMPLE invalue; 2399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPROW outend; 2409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int inrow; 2419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (inrow = 0; inrow < cinfo->max_v_samp_factor; inrow++) { 2439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr = input_data[inrow]; 2449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr = output_data[inrow]; 2459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outend = outptr + cinfo->output_width; 2469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (outptr < outend) { 2479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project invalue = *inptr++; /* don't need GETJSAMPLE() here */ 2489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = invalue; 2499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = invalue; 2509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 2569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Fast processing for the common case of 2:1 horizontal and 2:1 vertical. 2579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * It's still a box filter. 2589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 2619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecth2v2_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr, 2629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr) 2639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_data = *output_data_ptr; 2659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register JSAMPROW inptr, outptr; 2669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register JSAMPLE invalue; 2679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPROW outend; 2689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int inrow, outrow; 2699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inrow = outrow = 0; 2719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (outrow < cinfo->max_v_samp_factor) { 2729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr = input_data[inrow]; 2739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr = output_data[outrow]; 2749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outend = outptr + cinfo->output_width; 2759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (outptr < outend) { 2769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project invalue = *inptr++; /* don't need GETJSAMPLE() here */ 2779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = invalue; 2789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = invalue; 2799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jcopy_sample_rows(output_data, outrow, output_data, outrow+1, 2819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1, cinfo->output_width); 2829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inrow++; 2839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outrow += 2; 2849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 2899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Fancy processing for the common case of 2:1 horizontal and 1:1 vertical. 2909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 2919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The upsampling algorithm is linear interpolation between pixel centers, 2929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * also known as a "triangle filter". This is a good compromise between 2939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * speed and visual quality. The centers of the output pixels are 1/4 and 3/4 2949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * of the way between input pixel centers. 2959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 2969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * A note about the "bias" calculations: when rounding fractional values to 2979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * integer, we do not want to always round 0.5 up to the next integer. 2989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * If we did that, we'd introduce a noticeable bias towards larger values. 2999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Instead, this code is arranged so that 0.5 will be rounded up or down at 3009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * alternate pixel locations (a simple ordered dither pattern). 3019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 3049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecth2v1_fancy_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr, 3059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr) 3069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_data = *output_data_ptr; 3089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register JSAMPROW inptr, outptr; 3099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int invalue; 3109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register JDIMENSION colctr; 3119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int inrow; 3129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (inrow = 0; inrow < cinfo->max_v_samp_factor; inrow++) { 3149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr = input_data[inrow]; 3159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr = output_data[inrow]; 3169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Special case for first column */ 3179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project invalue = GETJSAMPLE(*inptr++); 3189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = (JSAMPLE) invalue; 3199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = (JSAMPLE) ((invalue * 3 + GETJSAMPLE(*inptr) + 2) >> 2); 3209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (colctr = compptr->downsampled_width - 2; colctr > 0; colctr--) { 3229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* General case: 3/4 * nearer pixel + 1/4 * further pixel */ 3239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project invalue = GETJSAMPLE(*inptr++) * 3; 3249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = (JSAMPLE) ((invalue + GETJSAMPLE(inptr[-2]) + 1) >> 2); 3259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = (JSAMPLE) ((invalue + GETJSAMPLE(*inptr) + 2) >> 2); 3269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Special case for last column */ 3299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project invalue = GETJSAMPLE(*inptr); 3309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = (JSAMPLE) ((invalue * 3 + GETJSAMPLE(inptr[-1]) + 1) >> 2); 3319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = (JSAMPLE) invalue; 3329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 3379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Fancy processing for the common case of 2:1 horizontal and 2:1 vertical. 3389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Again a triangle filter; see comments for h2v1 case, above. 3399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 3409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * It is OK for us to reference the adjacent input rows because we demanded 3419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * context from the main buffer controller (see initialization code). 3429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 3459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecth2v2_fancy_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr, 3469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr) 3479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_data = *output_data_ptr; 3499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register JSAMPROW inptr0, inptr1, outptr; 3509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if BITS_IN_JSAMPLE == 8 3519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int thiscolsum, lastcolsum, nextcolsum; 3529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 3539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register INT32 thiscolsum, lastcolsum, nextcolsum; 3549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 3559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register JDIMENSION colctr; 3569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int inrow, outrow, v; 3579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inrow = outrow = 0; 3599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (outrow < cinfo->max_v_samp_factor) { 3609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (v = 0; v < 2; v++) { 3619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* inptr0 points to nearest input row, inptr1 points to next nearest */ 3629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr0 = input_data[inrow]; 3639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (v == 0) /* next nearest is row above */ 3649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr1 = input_data[inrow-1]; 3659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project else /* next nearest is row below */ 3669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr1 = input_data[inrow+1]; 3679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr = output_data[outrow++]; 3689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Special case for first column */ 3709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project thiscolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++); 3719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project nextcolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++); 3729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = (JSAMPLE) ((thiscolsum * 4 + 8) >> 4); 3739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = (JSAMPLE) ((thiscolsum * 3 + nextcolsum + 7) >> 4); 3749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project lastcolsum = thiscolsum; thiscolsum = nextcolsum; 3759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (colctr = compptr->downsampled_width - 2; colctr > 0; colctr--) { 3779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* General case: 3/4 * nearer pixel + 1/4 * further pixel in each */ 3789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* dimension, thus 9/16, 3/16, 3/16, 1/16 overall */ 3799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project nextcolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++); 3809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = (JSAMPLE) ((thiscolsum * 3 + lastcolsum + 8) >> 4); 3819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = (JSAMPLE) ((thiscolsum * 3 + nextcolsum + 7) >> 4); 3829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project lastcolsum = thiscolsum; thiscolsum = nextcolsum; 3839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Special case for last column */ 3869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = (JSAMPLE) ((thiscolsum * 3 + lastcolsum + 8) >> 4); 3879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *outptr++ = (JSAMPLE) ((thiscolsum * 4 + 7) >> 4); 3889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inrow++; 3909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 3959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Module initialization routine for upsampling. 3969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(void) 3999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjinit_upsampler (j_decompress_ptr cinfo) 4009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 4019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_upsample_ptr upsample; 4029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci; 4039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info * compptr; 4049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boolean need_buffer, do_fancy; 4059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int h_in_group, v_in_group, h_out_group, v_out_group; 4069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample = (my_upsample_ptr) 4089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 4099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project SIZEOF(my_upsampler)); 4109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->upsample = (struct jpeg_upsampler *) upsample; 4119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->pub.start_pass = start_pass_upsample; 4129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->pub.upsample = sep_upsample; 4139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->pub.need_context_rows = FALSE; /* until we find out differently */ 4149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->CCIR601_sampling) /* this isn't supported */ 4169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(cinfo, JERR_CCIR601_NOTIMPL); 4179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* jdmainct.c doesn't support context rows when min_DCT_scaled_size = 1, 4199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * so don't ask for it. 4209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project do_fancy = cinfo->do_fancy_upsampling && cinfo->min_DCT_scaled_size > 1; 4229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Verify we can handle the sampling factors, select per-component methods, 4249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * and create storage as needed. 4259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 4279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ci++, compptr++) { 4289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Compute size of an "input group" after IDCT scaling. This many samples 4299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * are to be converted to max_h_samp_factor * max_v_samp_factor pixels. 4309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project h_in_group = (compptr->h_samp_factor * compptr->DCT_scaled_size) / 4329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->min_DCT_scaled_size; 4339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project v_in_group = (compptr->v_samp_factor * compptr->DCT_scaled_size) / 4349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->min_DCT_scaled_size; 4359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project h_out_group = cinfo->max_h_samp_factor; 4369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project v_out_group = cinfo->max_v_samp_factor; 4379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->rowgroup_height[ci] = v_in_group; /* save for use later */ 4389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project need_buffer = TRUE; 4399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! compptr->component_needed) { 4409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Don't bother to upsample an uninteresting component. */ 4419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->methods[ci] = noop_upsample; 4429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project need_buffer = FALSE; 4439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else if (h_in_group == h_out_group && v_in_group == v_out_group) { 4449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Fullsize components can be processed without any work. */ 4459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->methods[ci] = fullsize_upsample; 4469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project need_buffer = FALSE; 4479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else if (h_in_group * 2 == h_out_group && 4489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project v_in_group == v_out_group) { 4499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Special cases for 2h1v upsampling */ 4509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (do_fancy && compptr->downsampled_width > 2) 4519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->methods[ci] = h2v1_fancy_upsample; 4529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project else 4539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->methods[ci] = h2v1_upsample; 4549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else if (h_in_group * 2 == h_out_group && 4559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project v_in_group * 2 == v_out_group) { 4569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Special cases for 2h2v upsampling */ 4579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (do_fancy && compptr->downsampled_width > 2) { 4589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->methods[ci] = h2v2_fancy_upsample; 4599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->pub.need_context_rows = TRUE; 4609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else 4619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->methods[ci] = h2v2_upsample; 4629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else if ((h_out_group % h_in_group) == 0 && 4639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (v_out_group % v_in_group) == 0) { 4649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Generic integral-factors upsampling method */ 4659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->methods[ci] = int_upsample; 4669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->h_expand[ci] = (UINT8) (h_out_group / h_in_group); 4679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->v_expand[ci] = (UINT8) (v_out_group / v_in_group); 4689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else 4699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(cinfo, JERR_FRACT_SAMPLE_NOTIMPL); 4709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (need_buffer) { 4719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project upsample->color_buf[ci] = (*cinfo->mem->alloc_sarray) 4729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((j_common_ptr) cinfo, JPOOL_IMAGE, 4739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (JDIMENSION) jround_up((long) cinfo->output_width, 4749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (long) cinfo->max_h_samp_factor), 4759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (JDIMENSION) cinfo->max_v_samp_factor); 4769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 479