hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * jdcoefct.c |
| 3 | * |
noel@chromium.org | 3395bcc | 2014-04-14 06:56:00 +0000 | [diff] [blame] | 4 | * This file was part of the Independent JPEG Group's software: |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 5 | * Copyright (C) 1994-1997, Thomas G. Lane. |
noel@chromium.org | 3395bcc | 2014-04-14 06:56:00 +0000 | [diff] [blame] | 6 | * libjpeg-turbo Modifications: |
Aaron Gable | c9c8755 | 2015-08-03 09:34:32 -0700 | [diff] [blame] | 7 | * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 8 | * Copyright (C) 2010, 2015-2016, 2019-2020, D. R. Commander. |
| 9 | * Copyright (C) 2015, 2020, Google, Inc. |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 10 | * For conditions of distribution and use, see the accompanying README.ijg |
| 11 | * file. |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 12 | * |
| 13 | * This file contains the coefficient buffer controller for decompression. |
| 14 | * This controller is the top level of the JPEG decompressor proper. |
| 15 | * The coefficient buffer lies between entropy decoding and inverse-DCT steps. |
| 16 | * |
| 17 | * In buffered-image mode, this controller is the interface between |
| 18 | * input-oriented processing and output-oriented processing. |
| 19 | * Also, the input side (only) is used when reading a file for transcoding. |
| 20 | */ |
| 21 | |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 22 | #include "jinclude.h" |
Aaron Gable | c9c8755 | 2015-08-03 09:34:32 -0700 | [diff] [blame] | 23 | #include "jdcoefct.h" |
hbono@chromium.org | 9862697 | 2011-08-03 03:13:08 +0000 | [diff] [blame] | 24 | #include "jpegcomp.h" |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 25 | |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 26 | |
| 27 | /* Forward declarations */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 28 | METHODDEF(int) decompress_onepass(j_decompress_ptr cinfo, |
| 29 | JSAMPIMAGE output_buf); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 30 | #ifdef D_MULTISCAN_FILES_SUPPORTED |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 31 | METHODDEF(int) decompress_data(j_decompress_ptr cinfo, JSAMPIMAGE output_buf); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 32 | #endif |
| 33 | #ifdef BLOCK_SMOOTHING_SUPPORTED |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 34 | LOCAL(boolean) smoothing_ok(j_decompress_ptr cinfo); |
| 35 | METHODDEF(int) decompress_smooth_data(j_decompress_ptr cinfo, |
| 36 | JSAMPIMAGE output_buf); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 37 | #endif |
| 38 | |
| 39 | |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 40 | /* |
| 41 | * Initialize for an input processing pass. |
| 42 | */ |
| 43 | |
| 44 | METHODDEF(void) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 45 | start_input_pass(j_decompress_ptr cinfo) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 46 | { |
| 47 | cinfo->input_iMCU_row = 0; |
| 48 | start_iMCU_row(cinfo); |
| 49 | } |
| 50 | |
| 51 | |
| 52 | /* |
| 53 | * Initialize for an output processing pass. |
| 54 | */ |
| 55 | |
| 56 | METHODDEF(void) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 57 | start_output_pass(j_decompress_ptr cinfo) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 58 | { |
| 59 | #ifdef BLOCK_SMOOTHING_SUPPORTED |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 60 | my_coef_ptr coef = (my_coef_ptr)cinfo->coef; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 61 | |
| 62 | /* If multipass, check to see whether to use block smoothing on this pass */ |
| 63 | if (coef->pub.coef_arrays != NULL) { |
| 64 | if (cinfo->do_block_smoothing && smoothing_ok(cinfo)) |
| 65 | coef->pub.decompress_data = decompress_smooth_data; |
| 66 | else |
| 67 | coef->pub.decompress_data = decompress_data; |
| 68 | } |
| 69 | #endif |
| 70 | cinfo->output_iMCU_row = 0; |
| 71 | } |
| 72 | |
| 73 | |
| 74 | /* |
| 75 | * Decompress and return some data in the single-pass case. |
| 76 | * Always attempts to emit one fully interleaved MCU row ("iMCU" row). |
| 77 | * Input and output must run in lockstep since we have only a one-MCU buffer. |
| 78 | * Return value is JPEG_ROW_COMPLETED, JPEG_SCAN_COMPLETED, or JPEG_SUSPENDED. |
| 79 | * |
| 80 | * NB: output_buf contains a plane for each component in image, |
| 81 | * which we index according to the component's SOF position. |
| 82 | */ |
| 83 | |
| 84 | METHODDEF(int) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 85 | decompress_onepass(j_decompress_ptr cinfo, JSAMPIMAGE output_buf) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 86 | { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 87 | my_coef_ptr coef = (my_coef_ptr)cinfo->coef; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 88 | JDIMENSION MCU_col_num; /* index of current MCU within row */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 89 | JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1; |
| 90 | JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; |
| 91 | int blkn, ci, xindex, yindex, yoffset, useful_width; |
| 92 | JSAMPARRAY output_ptr; |
| 93 | JDIMENSION start_col, output_col; |
| 94 | jpeg_component_info *compptr; |
| 95 | inverse_DCT_method_ptr inverse_DCT; |
| 96 | |
| 97 | /* Loop to process as much as one whole iMCU row */ |
| 98 | for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; |
| 99 | yoffset++) { |
| 100 | for (MCU_col_num = coef->MCU_ctr; MCU_col_num <= last_MCU_col; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 101 | MCU_col_num++) { |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 102 | /* Try to fetch an MCU. Entropy decoder expects buffer to be zeroed. */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 103 | jzero_far((void *)coef->MCU_buffer[0], |
| 104 | (size_t)(cinfo->blocks_in_MCU * sizeof(JBLOCK))); |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 105 | if (!cinfo->entropy->insufficient_data) |
| 106 | cinfo->master->last_good_iMCU_row = cinfo->input_iMCU_row; |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 107 | if (!(*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 108 | /* Suspension forced; update state counters and exit */ |
| 109 | coef->MCU_vert_offset = yoffset; |
| 110 | coef->MCU_ctr = MCU_col_num; |
| 111 | return JPEG_SUSPENDED; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 112 | } |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 113 | |
| 114 | /* Only perform the IDCT on blocks that are contained within the desired |
| 115 | * cropping region. |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 116 | */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 117 | if (MCU_col_num >= cinfo->master->first_iMCU_col && |
| 118 | MCU_col_num <= cinfo->master->last_iMCU_col) { |
| 119 | /* Determine where data should go in output_buf and do the IDCT thing. |
| 120 | * We skip dummy blocks at the right and bottom edges (but blkn gets |
| 121 | * incremented past them!). Note the inner loop relies on having |
| 122 | * allocated the MCU_buffer[] blocks sequentially. |
| 123 | */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 124 | blkn = 0; /* index of current DCT block within MCU */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 125 | for (ci = 0; ci < cinfo->comps_in_scan; ci++) { |
| 126 | compptr = cinfo->cur_comp_info[ci]; |
| 127 | /* Don't bother to IDCT an uninteresting component. */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 128 | if (!compptr->component_needed) { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 129 | blkn += compptr->MCU_blocks; |
| 130 | continue; |
| 131 | } |
| 132 | inverse_DCT = cinfo->idct->inverse_DCT[compptr->component_index]; |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 133 | useful_width = (MCU_col_num < last_MCU_col) ? |
| 134 | compptr->MCU_width : compptr->last_col_width; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 135 | output_ptr = output_buf[compptr->component_index] + |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 136 | yoffset * compptr->_DCT_scaled_size; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 137 | start_col = (MCU_col_num - cinfo->master->first_iMCU_col) * |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 138 | compptr->MCU_sample_width; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 139 | for (yindex = 0; yindex < compptr->MCU_height; yindex++) { |
| 140 | if (cinfo->input_iMCU_row < last_iMCU_row || |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 141 | yoffset + yindex < compptr->last_row_height) { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 142 | output_col = start_col; |
| 143 | for (xindex = 0; xindex < useful_width; xindex++) { |
| 144 | (*inverse_DCT) (cinfo, compptr, |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 145 | (JCOEFPTR)coef->MCU_buffer[blkn + xindex], |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 146 | output_ptr, output_col); |
| 147 | output_col += compptr->_DCT_scaled_size; |
| 148 | } |
| 149 | } |
| 150 | blkn += compptr->MCU_width; |
| 151 | output_ptr += compptr->_DCT_scaled_size; |
| 152 | } |
| 153 | } |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 154 | } |
| 155 | } |
| 156 | /* Completed an MCU row, but perhaps not an iMCU row */ |
| 157 | coef->MCU_ctr = 0; |
| 158 | } |
| 159 | /* Completed the iMCU row, advance counters for next one */ |
| 160 | cinfo->output_iMCU_row++; |
| 161 | if (++(cinfo->input_iMCU_row) < cinfo->total_iMCU_rows) { |
| 162 | start_iMCU_row(cinfo); |
| 163 | return JPEG_ROW_COMPLETED; |
| 164 | } |
| 165 | /* Completed the scan */ |
| 166 | (*cinfo->inputctl->finish_input_pass) (cinfo); |
| 167 | return JPEG_SCAN_COMPLETED; |
| 168 | } |
| 169 | |
| 170 | |
| 171 | /* |
| 172 | * Dummy consume-input routine for single-pass operation. |
| 173 | */ |
| 174 | |
| 175 | METHODDEF(int) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 176 | dummy_consume_data(j_decompress_ptr cinfo) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 177 | { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 178 | return JPEG_SUSPENDED; /* Always indicate nothing was done */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | |
| 182 | #ifdef D_MULTISCAN_FILES_SUPPORTED |
| 183 | |
| 184 | /* |
| 185 | * Consume input data and store it in the full-image coefficient buffer. |
| 186 | * We read as much as one fully interleaved MCU row ("iMCU" row) per call, |
| 187 | * ie, v_samp_factor block rows for each component in the scan. |
| 188 | * Return value is JPEG_ROW_COMPLETED, JPEG_SCAN_COMPLETED, or JPEG_SUSPENDED. |
| 189 | */ |
| 190 | |
| 191 | METHODDEF(int) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 192 | consume_data(j_decompress_ptr cinfo) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 193 | { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 194 | my_coef_ptr coef = (my_coef_ptr)cinfo->coef; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 195 | JDIMENSION MCU_col_num; /* index of current MCU within row */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 196 | int blkn, ci, xindex, yindex, yoffset; |
| 197 | JDIMENSION start_col; |
| 198 | JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN]; |
| 199 | JBLOCKROW buffer_ptr; |
| 200 | jpeg_component_info *compptr; |
| 201 | |
| 202 | /* Align the virtual buffers for the components used in this scan. */ |
| 203 | for (ci = 0; ci < cinfo->comps_in_scan; ci++) { |
| 204 | compptr = cinfo->cur_comp_info[ci]; |
| 205 | buffer[ci] = (*cinfo->mem->access_virt_barray) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 206 | ((j_common_ptr)cinfo, coef->whole_image[compptr->component_index], |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 207 | cinfo->input_iMCU_row * compptr->v_samp_factor, |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 208 | (JDIMENSION)compptr->v_samp_factor, TRUE); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 209 | /* Note: entropy decoder expects buffer to be zeroed, |
| 210 | * but this is handled automatically by the memory manager |
| 211 | * because we requested a pre-zeroed array. |
| 212 | */ |
| 213 | } |
| 214 | |
| 215 | /* Loop to process one whole iMCU row */ |
| 216 | for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; |
| 217 | yoffset++) { |
| 218 | for (MCU_col_num = coef->MCU_ctr; MCU_col_num < cinfo->MCUs_per_row; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 219 | MCU_col_num++) { |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 220 | /* Construct list of pointers to DCT blocks belonging to this MCU */ |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 221 | blkn = 0; /* index of current DCT block within MCU */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 222 | for (ci = 0; ci < cinfo->comps_in_scan; ci++) { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 223 | compptr = cinfo->cur_comp_info[ci]; |
| 224 | start_col = MCU_col_num * compptr->MCU_width; |
| 225 | for (yindex = 0; yindex < compptr->MCU_height; yindex++) { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 226 | buffer_ptr = buffer[ci][yindex + yoffset] + start_col; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 227 | for (xindex = 0; xindex < compptr->MCU_width; xindex++) { |
| 228 | coef->MCU_buffer[blkn++] = buffer_ptr++; |
| 229 | } |
| 230 | } |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 231 | } |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 232 | if (!cinfo->entropy->insufficient_data) |
| 233 | cinfo->master->last_good_iMCU_row = cinfo->input_iMCU_row; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 234 | /* Try to fetch the MCU. */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 235 | if (!(*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 236 | /* Suspension forced; update state counters and exit */ |
| 237 | coef->MCU_vert_offset = yoffset; |
| 238 | coef->MCU_ctr = MCU_col_num; |
| 239 | return JPEG_SUSPENDED; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 240 | } |
| 241 | } |
| 242 | /* Completed an MCU row, but perhaps not an iMCU row */ |
| 243 | coef->MCU_ctr = 0; |
| 244 | } |
| 245 | /* Completed the iMCU row, advance counters for next one */ |
| 246 | if (++(cinfo->input_iMCU_row) < cinfo->total_iMCU_rows) { |
| 247 | start_iMCU_row(cinfo); |
| 248 | return JPEG_ROW_COMPLETED; |
| 249 | } |
| 250 | /* Completed the scan */ |
| 251 | (*cinfo->inputctl->finish_input_pass) (cinfo); |
| 252 | return JPEG_SCAN_COMPLETED; |
| 253 | } |
| 254 | |
| 255 | |
| 256 | /* |
| 257 | * Decompress and return some data in the multi-pass case. |
| 258 | * Always attempts to emit one fully interleaved MCU row ("iMCU" row). |
| 259 | * Return value is JPEG_ROW_COMPLETED, JPEG_SCAN_COMPLETED, or JPEG_SUSPENDED. |
| 260 | * |
| 261 | * NB: output_buf contains a plane for each component in image. |
| 262 | */ |
| 263 | |
| 264 | METHODDEF(int) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 265 | decompress_data(j_decompress_ptr cinfo, JSAMPIMAGE output_buf) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 266 | { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 267 | my_coef_ptr coef = (my_coef_ptr)cinfo->coef; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 268 | JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; |
| 269 | JDIMENSION block_num; |
| 270 | int ci, block_row, block_rows; |
| 271 | JBLOCKARRAY buffer; |
| 272 | JBLOCKROW buffer_ptr; |
| 273 | JSAMPARRAY output_ptr; |
| 274 | JDIMENSION output_col; |
| 275 | jpeg_component_info *compptr; |
| 276 | inverse_DCT_method_ptr inverse_DCT; |
| 277 | |
| 278 | /* Force some input to be done if we are getting ahead of the input. */ |
| 279 | while (cinfo->input_scan_number < cinfo->output_scan_number || |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 280 | (cinfo->input_scan_number == cinfo->output_scan_number && |
| 281 | cinfo->input_iMCU_row <= cinfo->output_iMCU_row)) { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 282 | if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 283 | return JPEG_SUSPENDED; |
| 284 | } |
| 285 | |
| 286 | /* OK, output from the virtual arrays. */ |
| 287 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
| 288 | ci++, compptr++) { |
| 289 | /* Don't bother to IDCT an uninteresting component. */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 290 | if (!compptr->component_needed) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 291 | continue; |
| 292 | /* Align the virtual buffer for this component. */ |
| 293 | buffer = (*cinfo->mem->access_virt_barray) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 294 | ((j_common_ptr)cinfo, coef->whole_image[ci], |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 295 | cinfo->output_iMCU_row * compptr->v_samp_factor, |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 296 | (JDIMENSION)compptr->v_samp_factor, FALSE); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 297 | /* Count non-dummy DCT block rows in this iMCU row. */ |
| 298 | if (cinfo->output_iMCU_row < last_iMCU_row) |
| 299 | block_rows = compptr->v_samp_factor; |
| 300 | else { |
| 301 | /* NB: can't use last_row_height here; it is input-side-dependent! */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 302 | block_rows = (int)(compptr->height_in_blocks % compptr->v_samp_factor); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 303 | if (block_rows == 0) block_rows = compptr->v_samp_factor; |
| 304 | } |
| 305 | inverse_DCT = cinfo->idct->inverse_DCT[ci]; |
| 306 | output_ptr = output_buf[ci]; |
| 307 | /* Loop over all DCT blocks to be processed. */ |
| 308 | for (block_row = 0; block_row < block_rows; block_row++) { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 309 | buffer_ptr = buffer[block_row] + cinfo->master->first_MCU_col[ci]; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 310 | output_col = 0; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 311 | for (block_num = cinfo->master->first_MCU_col[ci]; |
| 312 | block_num <= cinfo->master->last_MCU_col[ci]; block_num++) { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 313 | (*inverse_DCT) (cinfo, compptr, (JCOEFPTR)buffer_ptr, output_ptr, |
| 314 | output_col); |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 315 | buffer_ptr++; |
| 316 | output_col += compptr->_DCT_scaled_size; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 317 | } |
hbono@chromium.org | 9862697 | 2011-08-03 03:13:08 +0000 | [diff] [blame] | 318 | output_ptr += compptr->_DCT_scaled_size; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 319 | } |
| 320 | } |
| 321 | |
| 322 | if (++(cinfo->output_iMCU_row) < cinfo->total_iMCU_rows) |
| 323 | return JPEG_ROW_COMPLETED; |
| 324 | return JPEG_SCAN_COMPLETED; |
| 325 | } |
| 326 | |
| 327 | #endif /* D_MULTISCAN_FILES_SUPPORTED */ |
| 328 | |
| 329 | |
| 330 | #ifdef BLOCK_SMOOTHING_SUPPORTED |
| 331 | |
| 332 | /* |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 333 | * This code applies interblock smoothing; the first 9 AC coefficients are |
| 334 | * estimated from the DC values of a DCT block and its 24 neighboring blocks. |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 335 | * We apply smoothing only for progressive JPEG decoding, and only if |
| 336 | * the coefficients it can estimate are not yet known to full precision. |
| 337 | */ |
| 338 | |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 339 | /* Natural-order array positions of the first 9 zigzag-order coefficients */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 340 | #define Q01_POS 1 |
| 341 | #define Q10_POS 8 |
| 342 | #define Q20_POS 16 |
| 343 | #define Q11_POS 9 |
| 344 | #define Q02_POS 2 |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 345 | #define Q03_POS 3 |
| 346 | #define Q12_POS 10 |
| 347 | #define Q21_POS 17 |
| 348 | #define Q30_POS 24 |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 349 | |
| 350 | /* |
| 351 | * Determine whether block smoothing is applicable and safe. |
| 352 | * We also latch the current states of the coef_bits[] entries for the |
| 353 | * AC coefficients; otherwise, if the input side of the decompressor |
| 354 | * advances into a new scan, we might think the coefficients are known |
| 355 | * more accurately than they really are. |
| 356 | */ |
| 357 | |
| 358 | LOCAL(boolean) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 359 | smoothing_ok(j_decompress_ptr cinfo) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 360 | { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 361 | my_coef_ptr coef = (my_coef_ptr)cinfo->coef; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 362 | boolean smoothing_useful = FALSE; |
| 363 | int ci, coefi; |
| 364 | jpeg_component_info *compptr; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 365 | JQUANT_TBL *qtable; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 366 | int *coef_bits, *prev_coef_bits; |
| 367 | int *coef_bits_latch, *prev_coef_bits_latch; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 368 | |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 369 | if (!cinfo->progressive_mode || cinfo->coef_bits == NULL) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 370 | return FALSE; |
| 371 | |
| 372 | /* Allocate latch area if not already done */ |
| 373 | if (coef->coef_bits_latch == NULL) |
| 374 | coef->coef_bits_latch = (int *) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 375 | (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE, |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 376 | cinfo->num_components * 2 * |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 377 | (SAVED_COEFS * sizeof(int))); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 378 | coef_bits_latch = coef->coef_bits_latch; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 379 | prev_coef_bits_latch = |
| 380 | &coef->coef_bits_latch[cinfo->num_components * SAVED_COEFS]; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 381 | |
| 382 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
| 383 | ci++, compptr++) { |
| 384 | /* All components' quantization values must already be latched. */ |
| 385 | if ((qtable = compptr->quant_table) == NULL) |
| 386 | return FALSE; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 387 | /* Verify DC & first 9 AC quantizers are nonzero to avoid zero-divide. */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 388 | if (qtable->quantval[0] == 0 || |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 389 | qtable->quantval[Q01_POS] == 0 || |
| 390 | qtable->quantval[Q10_POS] == 0 || |
| 391 | qtable->quantval[Q20_POS] == 0 || |
| 392 | qtable->quantval[Q11_POS] == 0 || |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 393 | qtable->quantval[Q02_POS] == 0 || |
| 394 | qtable->quantval[Q03_POS] == 0 || |
| 395 | qtable->quantval[Q12_POS] == 0 || |
| 396 | qtable->quantval[Q21_POS] == 0 || |
| 397 | qtable->quantval[Q30_POS] == 0) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 398 | return FALSE; |
| 399 | /* DC values must be at least partly known for all components. */ |
| 400 | coef_bits = cinfo->coef_bits[ci]; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 401 | prev_coef_bits = cinfo->coef_bits[ci + cinfo->num_components]; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 402 | if (coef_bits[0] < 0) |
| 403 | return FALSE; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 404 | coef_bits_latch[0] = coef_bits[0]; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 405 | /* Block smoothing is helpful if some AC coefficients remain inaccurate. */ |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 406 | for (coefi = 1; coefi < SAVED_COEFS; coefi++) { |
| 407 | if (cinfo->input_scan_number > 1) |
| 408 | prev_coef_bits_latch[coefi] = prev_coef_bits[coefi]; |
| 409 | else |
| 410 | prev_coef_bits_latch[coefi] = -1; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 411 | coef_bits_latch[coefi] = coef_bits[coefi]; |
| 412 | if (coef_bits[coefi] != 0) |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 413 | smoothing_useful = TRUE; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 414 | } |
| 415 | coef_bits_latch += SAVED_COEFS; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 416 | prev_coef_bits_latch += SAVED_COEFS; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 417 | } |
| 418 | |
| 419 | return smoothing_useful; |
| 420 | } |
| 421 | |
| 422 | |
| 423 | /* |
| 424 | * Variant of decompress_data for use when doing block smoothing. |
| 425 | */ |
| 426 | |
| 427 | METHODDEF(int) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 428 | decompress_smooth_data(j_decompress_ptr cinfo, JSAMPIMAGE output_buf) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 429 | { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 430 | my_coef_ptr coef = (my_coef_ptr)cinfo->coef; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 431 | JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; |
| 432 | JDIMENSION block_num, last_block_column; |
| 433 | int ci, block_row, block_rows, access_rows; |
| 434 | JBLOCKARRAY buffer; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 435 | JBLOCKROW buffer_ptr, prev_prev_block_row, prev_block_row; |
| 436 | JBLOCKROW next_block_row, next_next_block_row; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 437 | JSAMPARRAY output_ptr; |
| 438 | JDIMENSION output_col; |
| 439 | jpeg_component_info *compptr; |
| 440 | inverse_DCT_method_ptr inverse_DCT; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 441 | boolean change_dc; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 442 | JCOEF *workspace; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 443 | int *coef_bits; |
| 444 | JQUANT_TBL *quanttbl; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 445 | JLONG Q00, Q01, Q02, Q03 = 0, Q10, Q11, Q12 = 0, Q20, Q21 = 0, Q30 = 0, num; |
| 446 | int DC01, DC02, DC03, DC04, DC05, DC06, DC07, DC08, DC09, DC10, DC11, DC12, |
| 447 | DC13, DC14, DC15, DC16, DC17, DC18, DC19, DC20, DC21, DC22, DC23, DC24, |
| 448 | DC25; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 449 | int Al, pred; |
| 450 | |
| 451 | /* Keep a local variable to avoid looking it up more than once */ |
| 452 | workspace = coef->workspace; |
| 453 | |
| 454 | /* Force some input to be done if we are getting ahead of the input. */ |
| 455 | while (cinfo->input_scan_number <= cinfo->output_scan_number && |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 456 | !cinfo->inputctl->eoi_reached) { |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 457 | if (cinfo->input_scan_number == cinfo->output_scan_number) { |
| 458 | /* If input is working on current scan, we ordinarily want it to |
| 459 | * have completed the current row. But if input scan is DC, |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 460 | * we want it to keep two rows ahead so that next two block rows' DC |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 461 | * values are up to date. |
| 462 | */ |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 463 | JDIMENSION delta = (cinfo->Ss == 0) ? 2 : 0; |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 464 | if (cinfo->input_iMCU_row > cinfo->output_iMCU_row + delta) |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 465 | break; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 466 | } |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 467 | if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 468 | return JPEG_SUSPENDED; |
| 469 | } |
| 470 | |
| 471 | /* OK, output from the virtual arrays. */ |
| 472 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
| 473 | ci++, compptr++) { |
| 474 | /* Don't bother to IDCT an uninteresting component. */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 475 | if (!compptr->component_needed) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 476 | continue; |
| 477 | /* Count non-dummy DCT block rows in this iMCU row. */ |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 478 | if (cinfo->output_iMCU_row < last_iMCU_row - 1) { |
| 479 | block_rows = compptr->v_samp_factor; |
| 480 | access_rows = block_rows * 3; /* this and next two iMCU rows */ |
| 481 | } else if (cinfo->output_iMCU_row < last_iMCU_row) { |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 482 | block_rows = compptr->v_samp_factor; |
| 483 | access_rows = block_rows * 2; /* this and next iMCU row */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 484 | } else { |
| 485 | /* NB: can't use last_row_height here; it is input-side-dependent! */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 486 | block_rows = (int)(compptr->height_in_blocks % compptr->v_samp_factor); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 487 | if (block_rows == 0) block_rows = compptr->v_samp_factor; |
| 488 | access_rows = block_rows; /* this iMCU row only */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 489 | } |
| 490 | /* Align the virtual buffer for this component. */ |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 491 | if (cinfo->output_iMCU_row > 1) { |
| 492 | access_rows += 2 * compptr->v_samp_factor; /* prior two iMCU rows too */ |
| 493 | buffer = (*cinfo->mem->access_virt_barray) |
| 494 | ((j_common_ptr)cinfo, coef->whole_image[ci], |
| 495 | (cinfo->output_iMCU_row - 2) * compptr->v_samp_factor, |
| 496 | (JDIMENSION)access_rows, FALSE); |
| 497 | buffer += 2 * compptr->v_samp_factor; /* point to current iMCU row */ |
| 498 | } else if (cinfo->output_iMCU_row > 0) { |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 499 | buffer = (*cinfo->mem->access_virt_barray) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 500 | ((j_common_ptr)cinfo, coef->whole_image[ci], |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 501 | (cinfo->output_iMCU_row - 1) * compptr->v_samp_factor, |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 502 | (JDIMENSION)access_rows, FALSE); |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 503 | buffer += compptr->v_samp_factor; /* point to current iMCU row */ |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 504 | } else { |
| 505 | buffer = (*cinfo->mem->access_virt_barray) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 506 | ((j_common_ptr)cinfo, coef->whole_image[ci], |
| 507 | (JDIMENSION)0, (JDIMENSION)access_rows, FALSE); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 508 | } |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 509 | /* Fetch component-dependent info. |
| 510 | * If the current scan is incomplete, then we use the component-dependent |
| 511 | * info from the previous scan. |
| 512 | */ |
| 513 | if (cinfo->output_iMCU_row > cinfo->master->last_good_iMCU_row) |
| 514 | coef_bits = |
| 515 | coef->coef_bits_latch + ((ci + cinfo->num_components) * SAVED_COEFS); |
| 516 | else |
| 517 | coef_bits = coef->coef_bits_latch + (ci * SAVED_COEFS); |
| 518 | |
| 519 | /* We only do DC interpolation if no AC coefficient data is available. */ |
| 520 | change_dc = |
| 521 | coef_bits[1] == -1 && coef_bits[2] == -1 && coef_bits[3] == -1 && |
| 522 | coef_bits[4] == -1 && coef_bits[5] == -1 && coef_bits[6] == -1 && |
| 523 | coef_bits[7] == -1 && coef_bits[8] == -1 && coef_bits[9] == -1; |
| 524 | |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 525 | quanttbl = compptr->quant_table; |
| 526 | Q00 = quanttbl->quantval[0]; |
| 527 | Q01 = quanttbl->quantval[Q01_POS]; |
| 528 | Q10 = quanttbl->quantval[Q10_POS]; |
| 529 | Q20 = quanttbl->quantval[Q20_POS]; |
| 530 | Q11 = quanttbl->quantval[Q11_POS]; |
| 531 | Q02 = quanttbl->quantval[Q02_POS]; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 532 | if (change_dc) { |
| 533 | Q03 = quanttbl->quantval[Q03_POS]; |
| 534 | Q12 = quanttbl->quantval[Q12_POS]; |
| 535 | Q21 = quanttbl->quantval[Q21_POS]; |
| 536 | Q30 = quanttbl->quantval[Q30_POS]; |
| 537 | } |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 538 | inverse_DCT = cinfo->idct->inverse_DCT[ci]; |
| 539 | output_ptr = output_buf[ci]; |
| 540 | /* Loop over all DCT blocks to be processed. */ |
| 541 | for (block_row = 0; block_row < block_rows; block_row++) { |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 542 | buffer_ptr = buffer[block_row] + cinfo->master->first_MCU_col[ci]; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 543 | |
| 544 | if (block_row > 0 || cinfo->output_iMCU_row > 0) |
| 545 | prev_block_row = |
| 546 | buffer[block_row - 1] + cinfo->master->first_MCU_col[ci]; |
| 547 | else |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 548 | prev_block_row = buffer_ptr; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 549 | |
| 550 | if (block_row > 1 || cinfo->output_iMCU_row > 1) |
| 551 | prev_prev_block_row = |
| 552 | buffer[block_row - 2] + cinfo->master->first_MCU_col[ci]; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 553 | else |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 554 | prev_prev_block_row = prev_block_row; |
| 555 | |
| 556 | if (block_row < block_rows - 1 || cinfo->output_iMCU_row < last_iMCU_row) |
| 557 | next_block_row = |
| 558 | buffer[block_row + 1] + cinfo->master->first_MCU_col[ci]; |
| 559 | else |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 560 | next_block_row = buffer_ptr; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 561 | |
| 562 | if (block_row < block_rows - 2 || |
| 563 | cinfo->output_iMCU_row < last_iMCU_row - 1) |
| 564 | next_next_block_row = |
| 565 | buffer[block_row + 2] + cinfo->master->first_MCU_col[ci]; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 566 | else |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 567 | next_next_block_row = next_block_row; |
| 568 | |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 569 | /* We fetch the surrounding DC values using a sliding-register approach. |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 570 | * Initialize all 25 here so as to do the right thing on narrow pics. |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 571 | */ |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 572 | DC01 = DC02 = DC03 = DC04 = DC05 = (int)prev_prev_block_row[0][0]; |
| 573 | DC06 = DC07 = DC08 = DC09 = DC10 = (int)prev_block_row[0][0]; |
| 574 | DC11 = DC12 = DC13 = DC14 = DC15 = (int)buffer_ptr[0][0]; |
| 575 | DC16 = DC17 = DC18 = DC19 = DC20 = (int)next_block_row[0][0]; |
| 576 | DC21 = DC22 = DC23 = DC24 = DC25 = (int)next_next_block_row[0][0]; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 577 | output_col = 0; |
| 578 | last_block_column = compptr->width_in_blocks - 1; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 579 | for (block_num = cinfo->master->first_MCU_col[ci]; |
| 580 | block_num <= cinfo->master->last_MCU_col[ci]; block_num++) { |
| 581 | /* Fetch current DCT block into workspace so we can modify it. */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 582 | jcopy_block_row(buffer_ptr, (JBLOCKROW)workspace, (JDIMENSION)1); |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 583 | /* Update DC values */ |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 584 | if (block_num == cinfo->master->first_MCU_col[ci] && |
| 585 | block_num < last_block_column) { |
| 586 | DC04 = (int)prev_prev_block_row[1][0]; |
| 587 | DC09 = (int)prev_block_row[1][0]; |
| 588 | DC14 = (int)buffer_ptr[1][0]; |
| 589 | DC19 = (int)next_block_row[1][0]; |
| 590 | DC24 = (int)next_next_block_row[1][0]; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 591 | } |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 592 | if (block_num + 1 < last_block_column) { |
| 593 | DC05 = (int)prev_prev_block_row[2][0]; |
| 594 | DC10 = (int)prev_block_row[2][0]; |
| 595 | DC15 = (int)buffer_ptr[2][0]; |
| 596 | DC20 = (int)next_block_row[2][0]; |
| 597 | DC25 = (int)next_next_block_row[2][0]; |
| 598 | } |
| 599 | /* If DC interpolation is enabled, compute coefficient estimates using |
| 600 | * a Gaussian-like kernel, keeping the averages of the DC values. |
| 601 | * |
| 602 | * If DC interpolation is disabled, compute coefficient estimates using |
| 603 | * an algorithm similar to the one described in Section K.8 of the JPEG |
| 604 | * standard, except applied to a 5x5 window rather than a 3x3 window. |
| 605 | * |
| 606 | * An estimate is applied only if the coefficient is still zero and is |
| 607 | * not known to be fully accurate. |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 608 | */ |
| 609 | /* AC01 */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 610 | if ((Al = coef_bits[1]) != 0 && workspace[1] == 0) { |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 611 | num = Q00 * (change_dc ? |
| 612 | (-DC01 - DC02 + DC04 + DC05 - 3 * DC06 + 13 * DC07 - |
| 613 | 13 * DC09 + 3 * DC10 - 3 * DC11 + 38 * DC12 - 38 * DC14 + |
| 614 | 3 * DC15 - 3 * DC16 + 13 * DC17 - 13 * DC19 + 3 * DC20 - |
| 615 | DC21 - DC22 + DC24 + DC25) : |
| 616 | (-7 * DC11 + 50 * DC12 - 50 * DC14 + 7 * DC15)); |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 617 | if (num >= 0) { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 618 | pred = (int)(((Q01 << 7) + num) / (Q01 << 8)); |
| 619 | if (Al > 0 && pred >= (1 << Al)) |
| 620 | pred = (1 << Al) - 1; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 621 | } else { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 622 | pred = (int)(((Q01 << 7) - num) / (Q01 << 8)); |
| 623 | if (Al > 0 && pred >= (1 << Al)) |
| 624 | pred = (1 << Al) - 1; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 625 | pred = -pred; |
| 626 | } |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 627 | workspace[1] = (JCOEF)pred; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 628 | } |
| 629 | /* AC10 */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 630 | if ((Al = coef_bits[2]) != 0 && workspace[8] == 0) { |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 631 | num = Q00 * (change_dc ? |
| 632 | (-DC01 - 3 * DC02 - 3 * DC03 - 3 * DC04 - DC05 - DC06 + |
| 633 | 13 * DC07 + 38 * DC08 + 13 * DC09 - DC10 + DC16 - |
| 634 | 13 * DC17 - 38 * DC18 - 13 * DC19 + DC20 + DC21 + |
| 635 | 3 * DC22 + 3 * DC23 + 3 * DC24 + DC25) : |
| 636 | (-7 * DC03 + 50 * DC08 - 50 * DC18 + 7 * DC23)); |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 637 | if (num >= 0) { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 638 | pred = (int)(((Q10 << 7) + num) / (Q10 << 8)); |
| 639 | if (Al > 0 && pred >= (1 << Al)) |
| 640 | pred = (1 << Al) - 1; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 641 | } else { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 642 | pred = (int)(((Q10 << 7) - num) / (Q10 << 8)); |
| 643 | if (Al > 0 && pred >= (1 << Al)) |
| 644 | pred = (1 << Al) - 1; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 645 | pred = -pred; |
| 646 | } |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 647 | workspace[8] = (JCOEF)pred; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 648 | } |
| 649 | /* AC20 */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 650 | if ((Al = coef_bits[3]) != 0 && workspace[16] == 0) { |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 651 | num = Q00 * (change_dc ? |
| 652 | (DC03 + 2 * DC07 + 7 * DC08 + 2 * DC09 - 5 * DC12 - 14 * DC13 - |
| 653 | 5 * DC14 + 2 * DC17 + 7 * DC18 + 2 * DC19 + DC23) : |
| 654 | (-DC03 + 13 * DC08 - 24 * DC13 + 13 * DC18 - DC23)); |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 655 | if (num >= 0) { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 656 | pred = (int)(((Q20 << 7) + num) / (Q20 << 8)); |
| 657 | if (Al > 0 && pred >= (1 << Al)) |
| 658 | pred = (1 << Al) - 1; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 659 | } else { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 660 | pred = (int)(((Q20 << 7) - num) / (Q20 << 8)); |
| 661 | if (Al > 0 && pred >= (1 << Al)) |
| 662 | pred = (1 << Al) - 1; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 663 | pred = -pred; |
| 664 | } |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 665 | workspace[16] = (JCOEF)pred; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 666 | } |
| 667 | /* AC11 */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 668 | if ((Al = coef_bits[4]) != 0 && workspace[9] == 0) { |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 669 | num = Q00 * (change_dc ? |
| 670 | (-DC01 + DC05 + 9 * DC07 - 9 * DC09 - 9 * DC17 + |
| 671 | 9 * DC19 + DC21 - DC25) : |
| 672 | (DC10 + DC16 - 10 * DC17 + 10 * DC19 - DC02 - DC20 + DC22 - |
| 673 | DC24 + DC04 - DC06 + 10 * DC07 - 10 * DC09)); |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 674 | if (num >= 0) { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 675 | pred = (int)(((Q11 << 7) + num) / (Q11 << 8)); |
| 676 | if (Al > 0 && pred >= (1 << Al)) |
| 677 | pred = (1 << Al) - 1; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 678 | } else { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 679 | pred = (int)(((Q11 << 7) - num) / (Q11 << 8)); |
| 680 | if (Al > 0 && pred >= (1 << Al)) |
| 681 | pred = (1 << Al) - 1; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 682 | pred = -pred; |
| 683 | } |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 684 | workspace[9] = (JCOEF)pred; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 685 | } |
| 686 | /* AC02 */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 687 | if ((Al = coef_bits[5]) != 0 && workspace[2] == 0) { |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 688 | num = Q00 * (change_dc ? |
| 689 | (2 * DC07 - 5 * DC08 + 2 * DC09 + DC11 + 7 * DC12 - 14 * DC13 + |
| 690 | 7 * DC14 + DC15 + 2 * DC17 - 5 * DC18 + 2 * DC19) : |
| 691 | (-DC11 + 13 * DC12 - 24 * DC13 + 13 * DC14 - DC15)); |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 692 | if (num >= 0) { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 693 | pred = (int)(((Q02 << 7) + num) / (Q02 << 8)); |
| 694 | if (Al > 0 && pred >= (1 << Al)) |
| 695 | pred = (1 << Al) - 1; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 696 | } else { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 697 | pred = (int)(((Q02 << 7) - num) / (Q02 << 8)); |
| 698 | if (Al > 0 && pred >= (1 << Al)) |
| 699 | pred = (1 << Al) - 1; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 700 | pred = -pred; |
| 701 | } |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 702 | workspace[2] = (JCOEF)pred; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 703 | } |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 704 | if (change_dc) { |
| 705 | /* AC03 */ |
| 706 | if ((Al = coef_bits[6]) != 0 && workspace[3] == 0) { |
| 707 | num = Q00 * (DC07 - DC09 + 2 * DC12 - 2 * DC14 + DC17 - DC19); |
| 708 | if (num >= 0) { |
| 709 | pred = (int)(((Q03 << 7) + num) / (Q03 << 8)); |
| 710 | if (Al > 0 && pred >= (1 << Al)) |
| 711 | pred = (1 << Al) - 1; |
| 712 | } else { |
| 713 | pred = (int)(((Q03 << 7) - num) / (Q03 << 8)); |
| 714 | if (Al > 0 && pred >= (1 << Al)) |
| 715 | pred = (1 << Al) - 1; |
| 716 | pred = -pred; |
| 717 | } |
| 718 | workspace[3] = (JCOEF)pred; |
| 719 | } |
| 720 | /* AC12 */ |
| 721 | if ((Al = coef_bits[7]) != 0 && workspace[10] == 0) { |
| 722 | num = Q00 * (DC07 - 3 * DC08 + DC09 - DC17 + 3 * DC18 - DC19); |
| 723 | if (num >= 0) { |
| 724 | pred = (int)(((Q12 << 7) + num) / (Q12 << 8)); |
| 725 | if (Al > 0 && pred >= (1 << Al)) |
| 726 | pred = (1 << Al) - 1; |
| 727 | } else { |
| 728 | pred = (int)(((Q12 << 7) - num) / (Q12 << 8)); |
| 729 | if (Al > 0 && pred >= (1 << Al)) |
| 730 | pred = (1 << Al) - 1; |
| 731 | pred = -pred; |
| 732 | } |
| 733 | workspace[10] = (JCOEF)pred; |
| 734 | } |
| 735 | /* AC21 */ |
| 736 | if ((Al = coef_bits[8]) != 0 && workspace[17] == 0) { |
| 737 | num = Q00 * (DC07 - DC09 - 3 * DC12 + 3 * DC14 + DC17 - DC19); |
| 738 | if (num >= 0) { |
| 739 | pred = (int)(((Q21 << 7) + num) / (Q21 << 8)); |
| 740 | if (Al > 0 && pred >= (1 << Al)) |
| 741 | pred = (1 << Al) - 1; |
| 742 | } else { |
| 743 | pred = (int)(((Q21 << 7) - num) / (Q21 << 8)); |
| 744 | if (Al > 0 && pred >= (1 << Al)) |
| 745 | pred = (1 << Al) - 1; |
| 746 | pred = -pred; |
| 747 | } |
| 748 | workspace[17] = (JCOEF)pred; |
| 749 | } |
| 750 | /* AC30 */ |
| 751 | if ((Al = coef_bits[9]) != 0 && workspace[24] == 0) { |
| 752 | num = Q00 * (DC07 + 2 * DC08 + DC09 - DC17 - 2 * DC18 - DC19); |
| 753 | if (num >= 0) { |
| 754 | pred = (int)(((Q30 << 7) + num) / (Q30 << 8)); |
| 755 | if (Al > 0 && pred >= (1 << Al)) |
| 756 | pred = (1 << Al) - 1; |
| 757 | } else { |
| 758 | pred = (int)(((Q30 << 7) - num) / (Q30 << 8)); |
| 759 | if (Al > 0 && pred >= (1 << Al)) |
| 760 | pred = (1 << Al) - 1; |
| 761 | pred = -pred; |
| 762 | } |
| 763 | workspace[24] = (JCOEF)pred; |
| 764 | } |
| 765 | /* coef_bits[0] is non-negative. Otherwise this function would not |
| 766 | * be called. |
| 767 | */ |
| 768 | num = Q00 * |
| 769 | (-2 * DC01 - 6 * DC02 - 8 * DC03 - 6 * DC04 - 2 * DC05 - |
| 770 | 6 * DC06 + 6 * DC07 + 42 * DC08 + 6 * DC09 - 6 * DC10 - |
| 771 | 8 * DC11 + 42 * DC12 + 152 * DC13 + 42 * DC14 - 8 * DC15 - |
| 772 | 6 * DC16 + 6 * DC17 + 42 * DC18 + 6 * DC19 - 6 * DC20 - |
| 773 | 2 * DC21 - 6 * DC22 - 8 * DC23 - 6 * DC24 - 2 * DC25); |
| 774 | if (num >= 0) { |
| 775 | pred = (int)(((Q00 << 7) + num) / (Q00 << 8)); |
| 776 | } else { |
| 777 | pred = (int)(((Q00 << 7) - num) / (Q00 << 8)); |
| 778 | pred = -pred; |
| 779 | } |
| 780 | workspace[0] = (JCOEF)pred; |
| 781 | } /* change_dc */ |
| 782 | |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 783 | /* OK, do the IDCT */ |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 784 | (*inverse_DCT) (cinfo, compptr, (JCOEFPTR)workspace, output_ptr, |
| 785 | output_col); |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 786 | /* Advance for next column */ |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 787 | DC01 = DC02; DC02 = DC03; DC03 = DC04; DC04 = DC05; |
| 788 | DC06 = DC07; DC07 = DC08; DC08 = DC09; DC09 = DC10; |
| 789 | DC11 = DC12; DC12 = DC13; DC13 = DC14; DC14 = DC15; |
| 790 | DC16 = DC17; DC17 = DC18; DC18 = DC19; DC19 = DC20; |
| 791 | DC21 = DC22; DC22 = DC23; DC23 = DC24; DC24 = DC25; |
| 792 | buffer_ptr++, prev_block_row++, next_block_row++, |
| 793 | prev_prev_block_row++, next_next_block_row++; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 794 | output_col += compptr->_DCT_scaled_size; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 795 | } |
hbono@chromium.org | 9862697 | 2011-08-03 03:13:08 +0000 | [diff] [blame] | 796 | output_ptr += compptr->_DCT_scaled_size; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 797 | } |
| 798 | } |
| 799 | |
| 800 | if (++(cinfo->output_iMCU_row) < cinfo->total_iMCU_rows) |
| 801 | return JPEG_ROW_COMPLETED; |
| 802 | return JPEG_SCAN_COMPLETED; |
| 803 | } |
| 804 | |
| 805 | #endif /* BLOCK_SMOOTHING_SUPPORTED */ |
| 806 | |
| 807 | |
| 808 | /* |
| 809 | * Initialize coefficient buffer controller. |
| 810 | */ |
| 811 | |
| 812 | GLOBAL(void) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 813 | jinit_d_coef_controller(j_decompress_ptr cinfo, boolean need_full_buffer) |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 814 | { |
| 815 | my_coef_ptr coef; |
| 816 | |
| 817 | coef = (my_coef_ptr) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 818 | (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE, |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 819 | sizeof(my_coef_controller)); |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 820 | cinfo->coef = (struct jpeg_d_coef_controller *)coef; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 821 | coef->pub.start_input_pass = start_input_pass; |
| 822 | coef->pub.start_output_pass = start_output_pass; |
| 823 | #ifdef BLOCK_SMOOTHING_SUPPORTED |
| 824 | coef->coef_bits_latch = NULL; |
| 825 | #endif |
| 826 | |
| 827 | /* Create the coefficient buffer. */ |
| 828 | if (need_full_buffer) { |
| 829 | #ifdef D_MULTISCAN_FILES_SUPPORTED |
| 830 | /* Allocate a full-image virtual array for each component, */ |
| 831 | /* padded to a multiple of samp_factor DCT blocks in each direction. */ |
| 832 | /* Note we ask for a pre-zeroed array. */ |
| 833 | int ci, access_rows; |
| 834 | jpeg_component_info *compptr; |
| 835 | |
| 836 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 837 | ci++, compptr++) { |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 838 | access_rows = compptr->v_samp_factor; |
| 839 | #ifdef BLOCK_SMOOTHING_SUPPORTED |
| 840 | /* If block smoothing could be used, need a bigger window */ |
| 841 | if (cinfo->progressive_mode) |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 842 | access_rows *= 5; |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 843 | #endif |
| 844 | coef->whole_image[ci] = (*cinfo->mem->request_virt_barray) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 845 | ((j_common_ptr)cinfo, JPOOL_IMAGE, TRUE, |
| 846 | (JDIMENSION)jround_up((long)compptr->width_in_blocks, |
| 847 | (long)compptr->h_samp_factor), |
| 848 | (JDIMENSION)jround_up((long)compptr->height_in_blocks, |
| 849 | (long)compptr->v_samp_factor), |
| 850 | (JDIMENSION)access_rows); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 851 | } |
| 852 | coef->pub.consume_data = consume_data; |
| 853 | coef->pub.decompress_data = decompress_data; |
| 854 | coef->pub.coef_arrays = coef->whole_image; /* link to virtual arrays */ |
| 855 | #else |
| 856 | ERREXIT(cinfo, JERR_NOT_COMPILED); |
| 857 | #endif |
| 858 | } else { |
| 859 | /* We only need a single-MCU buffer. */ |
| 860 | JBLOCKROW buffer; |
| 861 | int i; |
| 862 | |
| 863 | buffer = (JBLOCKROW) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 864 | (*cinfo->mem->alloc_large) ((j_common_ptr)cinfo, JPOOL_IMAGE, |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 865 | D_MAX_BLOCKS_IN_MCU * sizeof(JBLOCK)); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 866 | for (i = 0; i < D_MAX_BLOCKS_IN_MCU; i++) { |
| 867 | coef->MCU_buffer[i] = buffer + i; |
| 868 | } |
| 869 | coef->pub.consume_data = dummy_consume_data; |
| 870 | coef->pub.decompress_data = decompress_onepass; |
| 871 | coef->pub.coef_arrays = NULL; /* flag for no virtual arrays */ |
| 872 | } |
| 873 | |
| 874 | /* Allocate the workspace buffer */ |
| 875 | coef->workspace = (JCOEF *) |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 876 | (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE, |
Tom Hudson | 0d47d2d | 2016-05-04 13:22:56 -0400 | [diff] [blame] | 877 | sizeof(JCOEF) * DCTSIZE2); |
hbono@chromium.org | f0c4f33 | 2010-11-01 05:14:55 +0000 | [diff] [blame] | 878 | } |