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annotate libs/libjpeg/jdpostct.c @ 17:aef7f51f6397

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author John Tsiombikas <nuclear@member.fsf.org>
date Wed, 10 Jun 2015 06:56:27 +0300
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nuclear@14 1 /*
nuclear@14 2 * jdpostct.c
nuclear@14 3 *
nuclear@14 4 * Copyright (C) 1994-1996, Thomas G. Lane.
nuclear@14 5 * This file is part of the Independent JPEG Group's software.
nuclear@14 6 * For conditions of distribution and use, see the accompanying README file.
nuclear@14 7 *
nuclear@14 8 * This file contains the decompression postprocessing controller.
nuclear@14 9 * This controller manages the upsampling, color conversion, and color
nuclear@14 10 * quantization/reduction steps; specifically, it controls the buffering
nuclear@14 11 * between upsample/color conversion and color quantization/reduction.
nuclear@14 12 *
nuclear@14 13 * If no color quantization/reduction is required, then this module has no
nuclear@14 14 * work to do, and it just hands off to the upsample/color conversion code.
nuclear@14 15 * An integrated upsample/convert/quantize process would replace this module
nuclear@14 16 * entirely.
nuclear@14 17 */
nuclear@14 18
nuclear@14 19 #define JPEG_INTERNALS
nuclear@14 20 #include "jinclude.h"
nuclear@14 21 #include "jpeglib.h"
nuclear@14 22
nuclear@14 23
nuclear@14 24 /* Private buffer controller object */
nuclear@14 25
nuclear@14 26 typedef struct {
nuclear@14 27 struct jpeg_d_post_controller pub; /* public fields */
nuclear@14 28
nuclear@14 29 /* Color quantization source buffer: this holds output data from
nuclear@14 30 * the upsample/color conversion step to be passed to the quantizer.
nuclear@14 31 * For two-pass color quantization, we need a full-image buffer;
nuclear@14 32 * for one-pass operation, a strip buffer is sufficient.
nuclear@14 33 */
nuclear@14 34 jvirt_sarray_ptr whole_image; /* virtual array, or NULL if one-pass */
nuclear@14 35 JSAMPARRAY buffer; /* strip buffer, or current strip of virtual */
nuclear@14 36 JDIMENSION strip_height; /* buffer size in rows */
nuclear@14 37 /* for two-pass mode only: */
nuclear@14 38 JDIMENSION starting_row; /* row # of first row in current strip */
nuclear@14 39 JDIMENSION next_row; /* index of next row to fill/empty in strip */
nuclear@14 40 } my_post_controller;
nuclear@14 41
nuclear@14 42 typedef my_post_controller * my_post_ptr;
nuclear@14 43
nuclear@14 44
nuclear@14 45 /* Forward declarations */
nuclear@14 46 METHODDEF(void) post_process_1pass
nuclear@14 47 JPP((j_decompress_ptr cinfo,
nuclear@14 48 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
nuclear@14 49 JDIMENSION in_row_groups_avail,
nuclear@14 50 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
nuclear@14 51 JDIMENSION out_rows_avail));
nuclear@14 52 #ifdef QUANT_2PASS_SUPPORTED
nuclear@14 53 METHODDEF(void) post_process_prepass
nuclear@14 54 JPP((j_decompress_ptr cinfo,
nuclear@14 55 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
nuclear@14 56 JDIMENSION in_row_groups_avail,
nuclear@14 57 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
nuclear@14 58 JDIMENSION out_rows_avail));
nuclear@14 59 METHODDEF(void) post_process_2pass
nuclear@14 60 JPP((j_decompress_ptr cinfo,
nuclear@14 61 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
nuclear@14 62 JDIMENSION in_row_groups_avail,
nuclear@14 63 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
nuclear@14 64 JDIMENSION out_rows_avail));
nuclear@14 65 #endif
nuclear@14 66
nuclear@14 67
nuclear@14 68 /*
nuclear@14 69 * Initialize for a processing pass.
nuclear@14 70 */
nuclear@14 71
nuclear@14 72 METHODDEF(void)
nuclear@14 73 start_pass_dpost (j_decompress_ptr cinfo, J_BUF_MODE pass_mode)
nuclear@14 74 {
nuclear@14 75 my_post_ptr post = (my_post_ptr) cinfo->post;
nuclear@14 76
nuclear@14 77 switch (pass_mode) {
nuclear@14 78 case JBUF_PASS_THRU:
nuclear@14 79 if (cinfo->quantize_colors) {
nuclear@14 80 /* Single-pass processing with color quantization. */
nuclear@14 81 post->pub.post_process_data = post_process_1pass;
nuclear@14 82 /* We could be doing buffered-image output before starting a 2-pass
nuclear@14 83 * color quantization; in that case, jinit_d_post_controller did not
nuclear@14 84 * allocate a strip buffer. Use the virtual-array buffer as workspace.
nuclear@14 85 */
nuclear@14 86 if (post->buffer == NULL) {
nuclear@14 87 post->buffer = (*cinfo->mem->access_virt_sarray)
nuclear@14 88 ((j_common_ptr) cinfo, post->whole_image,
nuclear@14 89 (JDIMENSION) 0, post->strip_height, TRUE);
nuclear@14 90 }
nuclear@14 91 } else {
nuclear@14 92 /* For single-pass processing without color quantization,
nuclear@14 93 * I have no work to do; just call the upsampler directly.
nuclear@14 94 */
nuclear@14 95 post->pub.post_process_data = cinfo->upsample->upsample;
nuclear@14 96 }
nuclear@14 97 break;
nuclear@14 98 #ifdef QUANT_2PASS_SUPPORTED
nuclear@14 99 case JBUF_SAVE_AND_PASS:
nuclear@14 100 /* First pass of 2-pass quantization */
nuclear@14 101 if (post->whole_image == NULL)
nuclear@14 102 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
nuclear@14 103 post->pub.post_process_data = post_process_prepass;
nuclear@14 104 break;
nuclear@14 105 case JBUF_CRANK_DEST:
nuclear@14 106 /* Second pass of 2-pass quantization */
nuclear@14 107 if (post->whole_image == NULL)
nuclear@14 108 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
nuclear@14 109 post->pub.post_process_data = post_process_2pass;
nuclear@14 110 break;
nuclear@14 111 #endif /* QUANT_2PASS_SUPPORTED */
nuclear@14 112 default:
nuclear@14 113 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
nuclear@14 114 break;
nuclear@14 115 }
nuclear@14 116 post->starting_row = post->next_row = 0;
nuclear@14 117 }
nuclear@14 118
nuclear@14 119
nuclear@14 120 /*
nuclear@14 121 * Process some data in the one-pass (strip buffer) case.
nuclear@14 122 * This is used for color precision reduction as well as one-pass quantization.
nuclear@14 123 */
nuclear@14 124
nuclear@14 125 METHODDEF(void)
nuclear@14 126 post_process_1pass (j_decompress_ptr cinfo,
nuclear@14 127 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
nuclear@14 128 JDIMENSION in_row_groups_avail,
nuclear@14 129 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
nuclear@14 130 JDIMENSION out_rows_avail)
nuclear@14 131 {
nuclear@14 132 my_post_ptr post = (my_post_ptr) cinfo->post;
nuclear@14 133 JDIMENSION num_rows, max_rows;
nuclear@14 134
nuclear@14 135 /* Fill the buffer, but not more than what we can dump out in one go. */
nuclear@14 136 /* Note we rely on the upsampler to detect bottom of image. */
nuclear@14 137 max_rows = out_rows_avail - *out_row_ctr;
nuclear@14 138 if (max_rows > post->strip_height)
nuclear@14 139 max_rows = post->strip_height;
nuclear@14 140 num_rows = 0;
nuclear@14 141 (*cinfo->upsample->upsample) (cinfo,
nuclear@14 142 input_buf, in_row_group_ctr, in_row_groups_avail,
nuclear@14 143 post->buffer, &num_rows, max_rows);
nuclear@14 144 /* Quantize and emit data. */
nuclear@14 145 (*cinfo->cquantize->color_quantize) (cinfo,
nuclear@14 146 post->buffer, output_buf + *out_row_ctr, (int) num_rows);
nuclear@14 147 *out_row_ctr += num_rows;
nuclear@14 148 }
nuclear@14 149
nuclear@14 150
nuclear@14 151 #ifdef QUANT_2PASS_SUPPORTED
nuclear@14 152
nuclear@14 153 /*
nuclear@14 154 * Process some data in the first pass of 2-pass quantization.
nuclear@14 155 */
nuclear@14 156
nuclear@14 157 METHODDEF(void)
nuclear@14 158 post_process_prepass (j_decompress_ptr cinfo,
nuclear@14 159 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
nuclear@14 160 JDIMENSION in_row_groups_avail,
nuclear@14 161 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
nuclear@14 162 JDIMENSION out_rows_avail)
nuclear@14 163 {
nuclear@14 164 my_post_ptr post = (my_post_ptr) cinfo->post;
nuclear@14 165 JDIMENSION old_next_row, num_rows;
nuclear@14 166
nuclear@14 167 /* Reposition virtual buffer if at start of strip. */
nuclear@14 168 if (post->next_row == 0) {
nuclear@14 169 post->buffer = (*cinfo->mem->access_virt_sarray)
nuclear@14 170 ((j_common_ptr) cinfo, post->whole_image,
nuclear@14 171 post->starting_row, post->strip_height, TRUE);
nuclear@14 172 }
nuclear@14 173
nuclear@14 174 /* Upsample some data (up to a strip height's worth). */
nuclear@14 175 old_next_row = post->next_row;
nuclear@14 176 (*cinfo->upsample->upsample) (cinfo,
nuclear@14 177 input_buf, in_row_group_ctr, in_row_groups_avail,
nuclear@14 178 post->buffer, &post->next_row, post->strip_height);
nuclear@14 179
nuclear@14 180 /* Allow quantizer to scan new data. No data is emitted, */
nuclear@14 181 /* but we advance out_row_ctr so outer loop can tell when we're done. */
nuclear@14 182 if (post->next_row > old_next_row) {
nuclear@14 183 num_rows = post->next_row - old_next_row;
nuclear@14 184 (*cinfo->cquantize->color_quantize) (cinfo, post->buffer + old_next_row,
nuclear@14 185 (JSAMPARRAY) NULL, (int) num_rows);
nuclear@14 186 *out_row_ctr += num_rows;
nuclear@14 187 }
nuclear@14 188
nuclear@14 189 /* Advance if we filled the strip. */
nuclear@14 190 if (post->next_row >= post->strip_height) {
nuclear@14 191 post->starting_row += post->strip_height;
nuclear@14 192 post->next_row = 0;
nuclear@14 193 }
nuclear@14 194 }
nuclear@14 195
nuclear@14 196
nuclear@14 197 /*
nuclear@14 198 * Process some data in the second pass of 2-pass quantization.
nuclear@14 199 */
nuclear@14 200
nuclear@14 201 METHODDEF(void)
nuclear@14 202 post_process_2pass (j_decompress_ptr cinfo,
nuclear@14 203 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
nuclear@14 204 JDIMENSION in_row_groups_avail,
nuclear@14 205 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
nuclear@14 206 JDIMENSION out_rows_avail)
nuclear@14 207 {
nuclear@14 208 my_post_ptr post = (my_post_ptr) cinfo->post;
nuclear@14 209 JDIMENSION num_rows, max_rows;
nuclear@14 210
nuclear@14 211 /* Reposition virtual buffer if at start of strip. */
nuclear@14 212 if (post->next_row == 0) {
nuclear@14 213 post->buffer = (*cinfo->mem->access_virt_sarray)
nuclear@14 214 ((j_common_ptr) cinfo, post->whole_image,
nuclear@14 215 post->starting_row, post->strip_height, FALSE);
nuclear@14 216 }
nuclear@14 217
nuclear@14 218 /* Determine number of rows to emit. */
nuclear@14 219 num_rows = post->strip_height - post->next_row; /* available in strip */
nuclear@14 220 max_rows = out_rows_avail - *out_row_ctr; /* available in output area */
nuclear@14 221 if (num_rows > max_rows)
nuclear@14 222 num_rows = max_rows;
nuclear@14 223 /* We have to check bottom of image here, can't depend on upsampler. */
nuclear@14 224 max_rows = cinfo->output_height - post->starting_row;
nuclear@14 225 if (num_rows > max_rows)
nuclear@14 226 num_rows = max_rows;
nuclear@14 227
nuclear@14 228 /* Quantize and emit data. */
nuclear@14 229 (*cinfo->cquantize->color_quantize) (cinfo,
nuclear@14 230 post->buffer + post->next_row, output_buf + *out_row_ctr,
nuclear@14 231 (int) num_rows);
nuclear@14 232 *out_row_ctr += num_rows;
nuclear@14 233
nuclear@14 234 /* Advance if we filled the strip. */
nuclear@14 235 post->next_row += num_rows;
nuclear@14 236 if (post->next_row >= post->strip_height) {
nuclear@14 237 post->starting_row += post->strip_height;
nuclear@14 238 post->next_row = 0;
nuclear@14 239 }
nuclear@14 240 }
nuclear@14 241
nuclear@14 242 #endif /* QUANT_2PASS_SUPPORTED */
nuclear@14 243
nuclear@14 244
nuclear@14 245 /*
nuclear@14 246 * Initialize postprocessing controller.
nuclear@14 247 */
nuclear@14 248
nuclear@14 249 GLOBAL(void)
nuclear@14 250 jinit_d_post_controller (j_decompress_ptr cinfo, boolean need_full_buffer)
nuclear@14 251 {
nuclear@14 252 my_post_ptr post;
nuclear@14 253
nuclear@14 254 post = (my_post_ptr)
nuclear@14 255 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@14 256 SIZEOF(my_post_controller));
nuclear@14 257 cinfo->post = (struct jpeg_d_post_controller *) post;
nuclear@14 258 post->pub.start_pass = start_pass_dpost;
nuclear@14 259 post->whole_image = NULL; /* flag for no virtual arrays */
nuclear@14 260 post->buffer = NULL; /* flag for no strip buffer */
nuclear@14 261
nuclear@14 262 /* Create the quantization buffer, if needed */
nuclear@14 263 if (cinfo->quantize_colors) {
nuclear@14 264 /* The buffer strip height is max_v_samp_factor, which is typically
nuclear@14 265 * an efficient number of rows for upsampling to return.
nuclear@14 266 * (In the presence of output rescaling, we might want to be smarter?)
nuclear@14 267 */
nuclear@14 268 post->strip_height = (JDIMENSION) cinfo->max_v_samp_factor;
nuclear@14 269 if (need_full_buffer) {
nuclear@14 270 /* Two-pass color quantization: need full-image storage. */
nuclear@14 271 /* We round up the number of rows to a multiple of the strip height. */
nuclear@14 272 #ifdef QUANT_2PASS_SUPPORTED
nuclear@14 273 post->whole_image = (*cinfo->mem->request_virt_sarray)
nuclear@14 274 ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
nuclear@14 275 cinfo->output_width * cinfo->out_color_components,
nuclear@14 276 (JDIMENSION) jround_up((long) cinfo->output_height,
nuclear@14 277 (long) post->strip_height),
nuclear@14 278 post->strip_height);
nuclear@14 279 #else
nuclear@14 280 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
nuclear@14 281 #endif /* QUANT_2PASS_SUPPORTED */
nuclear@14 282 } else {
nuclear@14 283 /* One-pass color quantization: just make a strip buffer. */
nuclear@14 284 post->buffer = (*cinfo->mem->alloc_sarray)
nuclear@14 285 ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@14 286 cinfo->output_width * cinfo->out_color_components,
nuclear@14 287 post->strip_height);
nuclear@14 288 }
nuclear@14 289 }
nuclear@14 290 }