-/*\r
- * jdmaster.c\r
- *\r
- * Copyright (C) 1991-1995, Thomas G. Lane.\r
- * This file is part of the Independent JPEG Group's software.\r
- * For conditions of distribution and use, see the accompanying README file.\r
- *\r
- * This file contains master control logic for the JPEG decompressor.\r
- * These routines are concerned with selecting the modules to be executed\r
- * and with determining the number of passes and the work to be done in each\r
- * pass.\r
- */\r
-\r
-#define JPEG_INTERNALS\r
-#include "jinclude.h"\r
-#include "radiant_jpeglib.h"\r
-\r
-\r
-/* Private state */\r
-\r
-typedef struct {\r
- struct jpeg_decomp_master pub; /* public fields */\r
-\r
- int pass_number; /* # of passes completed */\r
-\r
- boolean using_merged_upsample; /* TRUE if using merged upsample/cconvert */\r
-\r
- /* Saved references to initialized quantizer modules,\r
- * in case we need to switch modes.\r
- */\r
- struct jpeg_color_quantizer * quantizer_1pass;\r
- struct jpeg_color_quantizer * quantizer_2pass;\r
-} my_decomp_master;\r
-\r
-typedef my_decomp_master * my_master_ptr;\r
-\r
-\r
-/*\r
- * Determine whether merged upsample/color conversion should be used.\r
- * CRUCIAL: this must match the actual capabilities of jdmerge.c!\r
- */\r
-\r
-LOCAL boolean\r
-use_merged_upsample (j_decompress_ptr cinfo)\r
-{\r
-#ifdef UPSAMPLE_MERGING_SUPPORTED\r
- /* Merging is the equivalent of plain box-filter upsampling */\r
- if (cinfo->do_fancy_upsampling || cinfo->CCIR601_sampling)\r
- return FALSE;\r
- /* jdmerge.c only supports YCC=>RGB color conversion */\r
- if (cinfo->jpeg_color_space != JCS_YCbCr || cinfo->num_components != 3 ||\r
- cinfo->out_color_space != JCS_RGB ||\r
- cinfo->out_color_components != RGB_PIXELSIZE)\r
- return FALSE;\r
- /* and it only handles 2h1v or 2h2v sampling ratios */\r
- if (cinfo->comp_info[0].h_samp_factor != 2 ||\r
- cinfo->comp_info[1].h_samp_factor != 1 ||\r
- cinfo->comp_info[2].h_samp_factor != 1 ||\r
- cinfo->comp_info[0].v_samp_factor > 2 ||\r
- cinfo->comp_info[1].v_samp_factor != 1 ||\r
- cinfo->comp_info[2].v_samp_factor != 1)\r
- return FALSE;\r
- /* furthermore, it doesn't work if we've scaled the IDCTs differently */\r
- if (cinfo->comp_info[0].DCT_scaled_size != cinfo->min_DCT_scaled_size ||\r
- cinfo->comp_info[1].DCT_scaled_size != cinfo->min_DCT_scaled_size ||\r
- cinfo->comp_info[2].DCT_scaled_size != cinfo->min_DCT_scaled_size)\r
- return FALSE;\r
- /* ??? also need to test for upsample-time rescaling, when & if supported */\r
- return TRUE; /* by golly, it'll work... */\r
-#else\r
- return FALSE;\r
-#endif\r
-}\r
-\r
-\r
-/*\r
- * Compute output image dimensions and related values.\r
- * NOTE: this is exported for possible use by application.\r
- * Hence it mustn't do anything that can't be done twice.\r
- * Also note that it may be called before the master module is initialized!\r
- */\r
-\r
-GLOBAL void\r
-jpeg_calc_output_dimensions (j_decompress_ptr cinfo)\r
-/* Do computations that are needed before master selection phase */\r
-{\r
-#if 0 // JDC: commented out to remove warning\r
- int ci;\r
- jpeg_component_info *compptr;\r
-#endif\r
-\r
- /* Prevent application from calling me at wrong times */\r
- if (cinfo->global_state != DSTATE_READY)\r
- ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);\r
-\r
-#ifdef IDCT_SCALING_SUPPORTED\r
-\r
- /* Compute actual output image dimensions and DCT scaling choices. */\r
- if (cinfo->scale_num * 8 <= cinfo->scale_denom) {\r
- /* Provide 1/8 scaling */\r
- cinfo->output_width = (JDIMENSION)\r
- jdiv_round_up((long) cinfo->image_width, 8L);\r
- cinfo->output_height = (JDIMENSION)\r
- jdiv_round_up((long) cinfo->image_height, 8L);\r
- cinfo->min_DCT_scaled_size = 1;\r
- } else if (cinfo->scale_num * 4 <= cinfo->scale_denom) {\r
- /* Provide 1/4 scaling */\r
- cinfo->output_width = (JDIMENSION)\r
- jdiv_round_up((long) cinfo->image_width, 4L);\r
- cinfo->output_height = (JDIMENSION)\r
- jdiv_round_up((long) cinfo->image_height, 4L);\r
- cinfo->min_DCT_scaled_size = 2;\r
- } else if (cinfo->scale_num * 2 <= cinfo->scale_denom) {\r
- /* Provide 1/2 scaling */\r
- cinfo->output_width = (JDIMENSION)\r
- jdiv_round_up((long) cinfo->image_width, 2L);\r
- cinfo->output_height = (JDIMENSION)\r
- jdiv_round_up((long) cinfo->image_height, 2L);\r
- cinfo->min_DCT_scaled_size = 4;\r
- } else {\r
- /* Provide 1/1 scaling */\r
- cinfo->output_width = cinfo->image_width;\r
- cinfo->output_height = cinfo->image_height;\r
- cinfo->min_DCT_scaled_size = DCTSIZE;\r
- }\r
- /* In selecting the actual DCT scaling for each component, we try to\r
- * scale up the chroma components via IDCT scaling rather than upsampling.\r
- * This saves time if the upsampler gets to use 1:1 scaling.\r
- * Note this code assumes that the supported DCT scalings are powers of 2.\r
- */\r
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;\r
- ci++, compptr++) {\r
- int ssize = cinfo->min_DCT_scaled_size;\r
- while (ssize < DCTSIZE &&\r
- (compptr->h_samp_factor * ssize * 2 <=\r
- cinfo->max_h_samp_factor * cinfo->min_DCT_scaled_size) &&\r
- (compptr->v_samp_factor * ssize * 2 <=\r
- cinfo->max_v_samp_factor * cinfo->min_DCT_scaled_size)) {\r
- ssize = ssize * 2;\r
- }\r
- compptr->DCT_scaled_size = ssize;\r
- }\r
-\r
- /* Recompute downsampled dimensions of components;\r
- * application needs to know these if using raw downsampled data.\r
- */\r
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;\r
- ci++, compptr++) {\r
- /* Size in samples, after IDCT scaling */\r
- compptr->downsampled_width = (JDIMENSION)\r
- jdiv_round_up((long) cinfo->image_width *\r
- (long) (compptr->h_samp_factor * compptr->DCT_scaled_size),\r
- (long) (cinfo->max_h_samp_factor * DCTSIZE));\r
- compptr->downsampled_height = (JDIMENSION)\r
- jdiv_round_up((long) cinfo->image_height *\r
- (long) (compptr->v_samp_factor * compptr->DCT_scaled_size),\r
- (long) (cinfo->max_v_samp_factor * DCTSIZE));\r
- }\r
-\r
-#else /* !IDCT_SCALING_SUPPORTED */\r
-\r
- /* Hardwire it to "no scaling" */\r
- cinfo->output_width = cinfo->image_width;\r
- cinfo->output_height = cinfo->image_height;\r
- /* jdinput.c has already initialized DCT_scaled_size to DCTSIZE,\r
- * and has computed unscaled downsampled_width and downsampled_height.\r
- */\r
-\r
-#endif /* IDCT_SCALING_SUPPORTED */\r
-\r
- /* Report number of components in selected colorspace. */\r
- /* Probably this should be in the color conversion module... */\r
- switch (cinfo->out_color_space) {\r
- case JCS_GRAYSCALE:\r
- cinfo->out_color_components = 1;\r
- break;\r
- case JCS_RGB:\r
-#if RGB_PIXELSIZE != 3\r
- cinfo->out_color_components = RGB_PIXELSIZE;\r
- break;\r
-#endif /* else share code with YCbCr */\r
- case JCS_YCbCr:\r
- cinfo->out_color_components = 3;\r
- break;\r
- case JCS_CMYK:\r
- case JCS_YCCK:\r
- cinfo->out_color_components = 4;\r
- break;\r
- default: /* else must be same colorspace as in file */\r
- cinfo->out_color_components = cinfo->num_components;\r
- break;\r
- }\r
- cinfo->output_components = (cinfo->quantize_colors ? 1 :\r
- cinfo->out_color_components);\r
-\r
- /* See if upsampler will want to emit more than one row at a time */\r
- if (use_merged_upsample(cinfo))\r
- cinfo->rec_outbuf_height = cinfo->max_v_samp_factor;\r
- else\r
- cinfo->rec_outbuf_height = 1;\r
-}\r
-\r
-\r
-/*\r
- * Several decompression processes need to range-limit values to the range\r
- * 0..MAXJSAMPLE; the input value may fall somewhat outside this range\r
- * due to noise introduced by quantization, roundoff error, etc. These\r
- * processes are inner loops and need to be as fast as possible. On most\r
- * machines, particularly CPUs with pipelines or instruction prefetch,\r
- * a (subscript-check-less) C table lookup\r
- * x = sample_range_limit[x];\r
- * is faster than explicit tests\r
- * if (x < 0) x = 0;\r
- * else if (x > MAXJSAMPLE) x = MAXJSAMPLE;\r
- * These processes all use a common table prepared by the routine below.\r
- *\r
- * For most steps we can mathematically guarantee that the initial value\r
- * of x is within MAXJSAMPLE+1 of the legal range, so a table running from\r
- * -(MAXJSAMPLE+1) to 2*MAXJSAMPLE+1 is sufficient. But for the initial\r
- * limiting step (just after the IDCT), a wildly out-of-range value is \r
- * possible if the input data is corrupt. To avoid any chance of indexing\r
- * off the end of memory and getting a bad-pointer trap, we perform the\r
- * post-IDCT limiting thus:\r
- * x = range_limit[x & MASK];\r
- * where MASK is 2 bits wider than legal sample data, ie 10 bits for 8-bit\r
- * samples. Under normal circumstances this is more than enough range and\r
- * a correct output will be generated; with bogus input data the mask will\r
- * cause wraparound, and we will safely generate a bogus-but-in-range output.\r
- * For the post-IDCT step, we want to convert the data from signed to unsigned\r
- * representation by adding CENTERJSAMPLE at the same time that we limit it.\r
- * So the post-IDCT limiting table ends up looking like this:\r
- * CENTERJSAMPLE,CENTERJSAMPLE+1,...,MAXJSAMPLE,\r
- * MAXJSAMPLE (repeat 2*(MAXJSAMPLE+1)-CENTERJSAMPLE times),\r
- * 0 (repeat 2*(MAXJSAMPLE+1)-CENTERJSAMPLE times),\r
- * 0,1,...,CENTERJSAMPLE-1\r
- * Negative inputs select values from the upper half of the table after\r
- * masking.\r
- *\r
- * We can save some space by overlapping the start of the post-IDCT table\r
- * with the simpler range limiting table. The post-IDCT table begins at\r
- * sample_range_limit + CENTERJSAMPLE.\r
- *\r
- * Note that the table is allocated in near data space on PCs; it's small\r
- * enough and used often enough to justify this.\r
- */\r
-\r
-LOCAL void\r
-prepare_range_limit_table (j_decompress_ptr cinfo)\r
-/* Allocate and fill in the sample_range_limit table */\r
-{\r
- JSAMPLE * table;\r
- int i;\r
-\r
- table = (JSAMPLE *)\r
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,\r
- (5 * (MAXJSAMPLE+1) + CENTERJSAMPLE) * SIZEOF(JSAMPLE));\r
- table += (MAXJSAMPLE+1); /* allow negative subscripts of simple table */\r
- cinfo->sample_range_limit = table;\r
- /* First segment of "simple" table: limit[x] = 0 for x < 0 */\r
- MEMZERO(table - (MAXJSAMPLE+1), (MAXJSAMPLE+1) * SIZEOF(JSAMPLE));\r
- /* Main part of "simple" table: limit[x] = x */\r
- for (i = 0; i <= MAXJSAMPLE; i++)\r
- table[i] = (JSAMPLE) i;\r
- table += CENTERJSAMPLE; /* Point to where post-IDCT table starts */\r
- /* End of simple table, rest of first half of post-IDCT table */\r
- for (i = CENTERJSAMPLE; i < 2*(MAXJSAMPLE+1); i++)\r
- table[i] = MAXJSAMPLE;\r
- /* Second half of post-IDCT table */\r
- MEMZERO(table + (2 * (MAXJSAMPLE+1)),\r
- (2 * (MAXJSAMPLE+1) - CENTERJSAMPLE) * SIZEOF(JSAMPLE));\r
- MEMCOPY(table + (4 * (MAXJSAMPLE+1) - CENTERJSAMPLE),\r
- cinfo->sample_range_limit, CENTERJSAMPLE * SIZEOF(JSAMPLE));\r
-}\r
-\r
-\r
-/*\r
- * Master selection of decompression modules.\r
- * This is done once at jpeg_start_decompress time. We determine\r
- * which modules will be used and give them appropriate initialization calls.\r
- * We also initialize the decompressor input side to begin consuming data.\r
- *\r
- * Since jpeg_read_header has finished, we know what is in the SOF\r
- * and (first) SOS markers. We also have all the application parameter\r
- * settings.\r
- */\r
-\r
-LOCAL void\r
-master_selection (j_decompress_ptr cinfo)\r
-{\r
- my_master_ptr master = (my_master_ptr) cinfo->master;\r
- boolean use_c_buffer;\r
- long samplesperrow;\r
- JDIMENSION jd_samplesperrow;\r
-\r
- /* Initialize dimensions and other stuff */\r
- jpeg_calc_output_dimensions(cinfo);\r
- prepare_range_limit_table(cinfo);\r
-\r
- /* Width of an output scanline must be representable as JDIMENSION. */\r
- samplesperrow = (long) cinfo->output_width * (long) cinfo->out_color_components;\r
- jd_samplesperrow = (JDIMENSION) samplesperrow;\r
- if ((long) jd_samplesperrow != samplesperrow)\r
- ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);\r
-\r
- /* Initialize my private state */\r
- master->pass_number = 0;\r
- master->using_merged_upsample = use_merged_upsample(cinfo);\r
-\r
- /* Color quantizer selection */\r
- master->quantizer_1pass = NULL;\r
- master->quantizer_2pass = NULL;\r
- /* No mode changes if not using buffered-image mode. */\r
- if (! cinfo->quantize_colors || ! cinfo->buffered_image) {\r
- cinfo->enable_1pass_quant = FALSE;\r
- cinfo->enable_external_quant = FALSE;\r
- cinfo->enable_2pass_quant = FALSE;\r
- }\r
- if (cinfo->quantize_colors) {\r
- if (cinfo->raw_data_out)\r
- ERREXIT(cinfo, JERR_NOTIMPL);\r
- /* 2-pass quantizer only works in 3-component color space. */\r
- if (cinfo->out_color_components != 3) {\r
- cinfo->enable_1pass_quant = TRUE;\r
- cinfo->enable_external_quant = FALSE;\r
- cinfo->enable_2pass_quant = FALSE;\r
- cinfo->colormap = NULL;\r
- } else if (cinfo->colormap != NULL) {\r
- cinfo->enable_external_quant = TRUE;\r
- } else if (cinfo->two_pass_quantize) {\r
- cinfo->enable_2pass_quant = TRUE;\r
- } else {\r
- cinfo->enable_1pass_quant = TRUE;\r
- }\r
-\r
- if (cinfo->enable_1pass_quant) {\r
-#ifdef QUANT_1PASS_SUPPORTED\r
- jinit_1pass_quantizer(cinfo);\r
- master->quantizer_1pass = cinfo->cquantize;\r
-#else\r
- ERREXIT(cinfo, JERR_NOT_COMPILED);\r
-#endif\r
- }\r
-\r
- /* We use the 2-pass code to map to external colormaps. */\r
- if (cinfo->enable_2pass_quant || cinfo->enable_external_quant) {\r
-#ifdef QUANT_2PASS_SUPPORTED\r
- jinit_2pass_quantizer(cinfo);\r
- master->quantizer_2pass = cinfo->cquantize;\r
-#else\r
- ERREXIT(cinfo, JERR_NOT_COMPILED);\r
-#endif\r
- }\r
- /* If both quantizers are initialized, the 2-pass one is left active;\r
- * this is necessary for starting with quantization to an external map.\r
- */\r
- }\r
-\r
- /* Post-processing: in particular, color conversion first */\r
- if (! cinfo->raw_data_out) {\r
- if (master->using_merged_upsample) {\r
-#ifdef UPSAMPLE_MERGING_SUPPORTED\r
- jinit_merged_upsampler(cinfo); /* does color conversion too */\r
-#else\r
- ERREXIT(cinfo, JERR_NOT_COMPILED);\r
-#endif\r
- } else {\r
- jinit_color_deconverter(cinfo);\r
- jinit_upsampler(cinfo);\r
- }\r
- jinit_d_post_controller(cinfo, cinfo->enable_2pass_quant);\r
- }\r
- /* Inverse DCT */\r
- jinit_inverse_dct(cinfo);\r
- /* Entropy decoding: either Huffman or arithmetic coding. */\r
- if (cinfo->arith_code) {\r
- ERREXIT(cinfo, JERR_ARITH_NOTIMPL);\r
- } else {\r
- if (cinfo->progressive_mode) {\r
-#ifdef D_PROGRESSIVE_SUPPORTED\r
- jinit_phuff_decoder(cinfo);\r
-#else\r
- ERREXIT(cinfo, JERR_NO_PROGRESSIVE);\r
-#endif\r
- } else\r
- jinit_huff_decoder(cinfo);\r
- }\r
-\r
- /* Initialize principal buffer controllers. */\r
- use_c_buffer = cinfo->inputctl->has_multiple_scans || cinfo->buffered_image;\r
- jinit_d_coef_controller(cinfo, use_c_buffer);\r
-\r
- if (! cinfo->raw_data_out)\r
- jinit_d_main_controller(cinfo, FALSE /* never need full buffer here */);\r
-\r
- /* We can now tell the memory manager to allocate virtual arrays. */\r
- (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);\r
-\r
- /* Initialize input side of decompressor to consume first scan. */\r
- (*cinfo->inputctl->start_input_pass) (cinfo);\r
-\r
-#ifdef D_MULTISCAN_FILES_SUPPORTED\r
- /* If jpeg_start_decompress will read the whole file, initialize\r
- * progress monitoring appropriately. The input step is counted\r
- * as one pass.\r
- */\r
- if (cinfo->progress != NULL && ! cinfo->buffered_image &&\r
- cinfo->inputctl->has_multiple_scans) {\r
- int nscans;\r
- /* Estimate number of scans to set pass_limit. */\r
- if (cinfo->progressive_mode) {\r
- /* Arbitrarily estimate 2 interleaved DC scans + 3 AC scans/component. */\r
- nscans = 2 + 3 * cinfo->num_components;\r
- } else {\r
- /* For a nonprogressive multiscan file, estimate 1 scan per component. */\r
- nscans = cinfo->num_components;\r
- }\r
- cinfo->progress->pass_counter = 0L;\r
- cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows * nscans;\r
- cinfo->progress->completed_passes = 0;\r
- cinfo->progress->total_passes = (cinfo->enable_2pass_quant ? 3 : 2);\r
- /* Count the input pass as done */\r
- master->pass_number++;\r
- }\r
-#endif /* D_MULTISCAN_FILES_SUPPORTED */\r
-}\r
-\r
-\r
-/*\r
- * Per-pass setup.\r
- * This is called at the beginning of each output pass. We determine which\r
- * modules will be active during this pass and give them appropriate\r
- * start_pass calls. We also set is_dummy_pass to indicate whether this\r
- * is a "real" output pass or a dummy pass for color quantization.\r
- * (In the latter case, jdapi.c will crank the pass to completion.)\r
- */\r
-\r
-METHODDEF void\r
-prepare_for_output_pass (j_decompress_ptr cinfo)\r
-{\r
- my_master_ptr master = (my_master_ptr) cinfo->master;\r
-\r
- if (master->pub.is_dummy_pass) {\r
-#ifdef QUANT_2PASS_SUPPORTED\r
- /* Final pass of 2-pass quantization */\r
- master->pub.is_dummy_pass = FALSE;\r
- (*cinfo->cquantize->start_pass) (cinfo, FALSE);\r
- (*cinfo->post->start_pass) (cinfo, JBUF_CRANK_DEST);\r
- (*cinfo->main->start_pass) (cinfo, JBUF_CRANK_DEST);\r
-#else\r
- ERREXIT(cinfo, JERR_NOT_COMPILED);\r
-#endif /* QUANT_2PASS_SUPPORTED */\r
- } else {\r
- if (cinfo->quantize_colors && cinfo->colormap == NULL) {\r
- /* Select new quantization method */\r
- if (cinfo->two_pass_quantize && cinfo->enable_2pass_quant) {\r
- cinfo->cquantize = master->quantizer_2pass;\r
- master->pub.is_dummy_pass = TRUE;\r
- } else if (cinfo->enable_1pass_quant) {\r
- cinfo->cquantize = master->quantizer_1pass;\r
- } else {\r
- ERREXIT(cinfo, JERR_MODE_CHANGE);\r
- }\r
- }\r
- (*cinfo->idct->start_pass) (cinfo);\r
- (*cinfo->coef->start_output_pass) (cinfo);\r
- if (! cinfo->raw_data_out) {\r
- if (! master->using_merged_upsample)\r
- (*cinfo->cconvert->start_pass) (cinfo);\r
- (*cinfo->upsample->start_pass) (cinfo);\r
- if (cinfo->quantize_colors)\r
- (*cinfo->cquantize->start_pass) (cinfo, master->pub.is_dummy_pass);\r
- (*cinfo->post->start_pass) (cinfo,\r
- (master->pub.is_dummy_pass ? JBUF_SAVE_AND_PASS : JBUF_PASS_THRU));\r
- (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU);\r
- }\r
- }\r
-\r
- /* Set up progress monitor's pass info if present */\r
- if (cinfo->progress != NULL) {\r
- cinfo->progress->completed_passes = master->pass_number;\r
- cinfo->progress->total_passes = master->pass_number +\r
- (master->pub.is_dummy_pass ? 2 : 1);\r
- /* In buffered-image mode, we assume one more output pass if EOI not\r
- * yet reached, but no more passes if EOI has been reached.\r
- */\r
- if (cinfo->buffered_image && ! cinfo->inputctl->eoi_reached) {\r
- cinfo->progress->total_passes += (cinfo->enable_2pass_quant ? 2 : 1);\r
- }\r
- }\r
-}\r
-\r
-\r
-/*\r
- * Finish up at end of an output pass.\r
- */\r
-\r
-METHODDEF void\r
-finish_output_pass (j_decompress_ptr cinfo)\r
-{\r
- my_master_ptr master = (my_master_ptr) cinfo->master;\r
-\r
- if (cinfo->quantize_colors)\r
- (*cinfo->cquantize->finish_pass) (cinfo);\r
- master->pass_number++;\r
-}\r
-\r
-\r
-#ifdef D_MULTISCAN_FILES_SUPPORTED\r
-\r
-/*\r
- * Switch to a new external colormap between output passes.\r
- */\r
-\r
-GLOBAL void\r
-jpeg_new_colormap (j_decompress_ptr cinfo)\r
-{\r
- my_master_ptr master = (my_master_ptr) cinfo->master;\r
-\r
- /* Prevent application from calling me at wrong times */\r
- if (cinfo->global_state != DSTATE_BUFIMAGE)\r
- ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);\r
-\r
- if (cinfo->quantize_colors && cinfo->enable_external_quant &&\r
- cinfo->colormap != NULL) {\r
- /* Select 2-pass quantizer for external colormap use */\r
- cinfo->cquantize = master->quantizer_2pass;\r
- /* Notify quantizer of colormap change */\r
- (*cinfo->cquantize->new_color_map) (cinfo);\r
- master->pub.is_dummy_pass = FALSE; /* just in case */\r
- } else\r
- ERREXIT(cinfo, JERR_MODE_CHANGE);\r
-}\r
-\r
-#endif /* D_MULTISCAN_FILES_SUPPORTED */\r
-\r
-\r
-/*\r
- * Initialize master decompression control and select active modules.\r
- * This is performed at the start of jpeg_start_decompress.\r
- */\r
-\r
-GLOBAL void\r
-jinit_master_decompress (j_decompress_ptr cinfo)\r
-{\r
- my_master_ptr master;\r
-\r
- master = (my_master_ptr)\r
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,\r
- SIZEOF(my_decomp_master));\r
- cinfo->master = (struct jpeg_decomp_master *) master;\r
- master->pub.prepare_for_output_pass = prepare_for_output_pass;\r
- master->pub.finish_output_pass = finish_output_pass;\r
-\r
- master->pub.is_dummy_pass = FALSE;\r
-\r
- master_selection(cinfo);\r
-}\r
-\r
+/*
+ * jdmaster.c
+ *
+ * Copyright (C) 1991-1995, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains master control logic for the JPEG decompressor.
+ * These routines are concerned with selecting the modules to be executed
+ * and with determining the number of passes and the work to be done in each
+ * pass.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "radiant_jpeglib.h"
+
+
+/* Private state */
+
+typedef struct {
+ struct jpeg_decomp_master pub; /* public fields */
+
+ int pass_number; /* # of passes completed */
+
+ boolean using_merged_upsample; /* TRUE if using merged upsample/cconvert */
+
+ /* Saved references to initialized quantizer modules,
+ * in case we need to switch modes.
+ */
+ struct jpeg_color_quantizer * quantizer_1pass;
+ struct jpeg_color_quantizer * quantizer_2pass;
+} my_decomp_master;
+
+typedef my_decomp_master * my_master_ptr;
+
+
+/*
+ * Determine whether merged upsample/color conversion should be used.
+ * CRUCIAL: this must match the actual capabilities of jdmerge.c!
+ */
+
+LOCAL boolean
+use_merged_upsample (j_decompress_ptr cinfo)
+{
+#ifdef UPSAMPLE_MERGING_SUPPORTED
+ /* Merging is the equivalent of plain box-filter upsampling */
+ if (cinfo->do_fancy_upsampling || cinfo->CCIR601_sampling)
+ return FALSE;
+ /* jdmerge.c only supports YCC=>RGB color conversion */
+ if (cinfo->jpeg_color_space != JCS_YCbCr || cinfo->num_components != 3 ||
+ cinfo->out_color_space != JCS_RGB ||
+ cinfo->out_color_components != RGB_PIXELSIZE)
+ return FALSE;
+ /* and it only handles 2h1v or 2h2v sampling ratios */
+ if (cinfo->comp_info[0].h_samp_factor != 2 ||
+ cinfo->comp_info[1].h_samp_factor != 1 ||
+ cinfo->comp_info[2].h_samp_factor != 1 ||
+ cinfo->comp_info[0].v_samp_factor > 2 ||
+ cinfo->comp_info[1].v_samp_factor != 1 ||
+ cinfo->comp_info[2].v_samp_factor != 1)
+ return FALSE;
+ /* furthermore, it doesn't work if we've scaled the IDCTs differently */
+ if (cinfo->comp_info[0].DCT_scaled_size != cinfo->min_DCT_scaled_size ||
+ cinfo->comp_info[1].DCT_scaled_size != cinfo->min_DCT_scaled_size ||
+ cinfo->comp_info[2].DCT_scaled_size != cinfo->min_DCT_scaled_size)
+ return FALSE;
+ /* ??? also need to test for upsample-time rescaling, when & if supported */
+ return TRUE; /* by golly, it'll work... */
+#else
+ return FALSE;
+#endif
+}
+
+
+/*
+ * Compute output image dimensions and related values.
+ * NOTE: this is exported for possible use by application.
+ * Hence it mustn't do anything that can't be done twice.
+ * Also note that it may be called before the master module is initialized!
+ */
+
+GLOBAL void
+jpeg_calc_output_dimensions (j_decompress_ptr cinfo)
+/* Do computations that are needed before master selection phase */
+{
+#if 0 // JDC: commented out to remove warning
+ int ci;
+ jpeg_component_info *compptr;
+#endif
+
+ /* Prevent application from calling me at wrong times */
+ if (cinfo->global_state != DSTATE_READY)
+ ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+
+#ifdef IDCT_SCALING_SUPPORTED
+
+ /* Compute actual output image dimensions and DCT scaling choices. */
+ if (cinfo->scale_num * 8 <= cinfo->scale_denom) {
+ /* Provide 1/8 scaling */
+ cinfo->output_width = (JDIMENSION)
+ jdiv_round_up((long) cinfo->image_width, 8L);
+ cinfo->output_height = (JDIMENSION)
+ jdiv_round_up((long) cinfo->image_height, 8L);
+ cinfo->min_DCT_scaled_size = 1;
+ } else if (cinfo->scale_num * 4 <= cinfo->scale_denom) {
+ /* Provide 1/4 scaling */
+ cinfo->output_width = (JDIMENSION)
+ jdiv_round_up((long) cinfo->image_width, 4L);
+ cinfo->output_height = (JDIMENSION)
+ jdiv_round_up((long) cinfo->image_height, 4L);
+ cinfo->min_DCT_scaled_size = 2;
+ } else if (cinfo->scale_num * 2 <= cinfo->scale_denom) {
+ /* Provide 1/2 scaling */
+ cinfo->output_width = (JDIMENSION)
+ jdiv_round_up((long) cinfo->image_width, 2L);
+ cinfo->output_height = (JDIMENSION)
+ jdiv_round_up((long) cinfo->image_height, 2L);
+ cinfo->min_DCT_scaled_size = 4;
+ } else {
+ /* Provide 1/1 scaling */
+ cinfo->output_width = cinfo->image_width;
+ cinfo->output_height = cinfo->image_height;
+ cinfo->min_DCT_scaled_size = DCTSIZE;
+ }
+ /* In selecting the actual DCT scaling for each component, we try to
+ * scale up the chroma components via IDCT scaling rather than upsampling.
+ * This saves time if the upsampler gets to use 1:1 scaling.
+ * Note this code assumes that the supported DCT scalings are powers of 2.
+ */
+ for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+ ci++, compptr++) {
+ int ssize = cinfo->min_DCT_scaled_size;
+ while (ssize < DCTSIZE &&
+ (compptr->h_samp_factor * ssize * 2 <=
+ cinfo->max_h_samp_factor * cinfo->min_DCT_scaled_size) &&
+ (compptr->v_samp_factor * ssize * 2 <=
+ cinfo->max_v_samp_factor * cinfo->min_DCT_scaled_size)) {
+ ssize = ssize * 2;
+ }
+ compptr->DCT_scaled_size = ssize;
+ }
+
+ /* Recompute downsampled dimensions of components;
+ * application needs to know these if using raw downsampled data.
+ */
+ for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+ ci++, compptr++) {
+ /* Size in samples, after IDCT scaling */
+ compptr->downsampled_width = (JDIMENSION)
+ jdiv_round_up((long) cinfo->image_width *
+ (long) (compptr->h_samp_factor * compptr->DCT_scaled_size),
+ (long) (cinfo->max_h_samp_factor * DCTSIZE));
+ compptr->downsampled_height = (JDIMENSION)
+ jdiv_round_up((long) cinfo->image_height *
+ (long) (compptr->v_samp_factor * compptr->DCT_scaled_size),
+ (long) (cinfo->max_v_samp_factor * DCTSIZE));
+ }
+
+#else /* !IDCT_SCALING_SUPPORTED */
+
+ /* Hardwire it to "no scaling" */
+ cinfo->output_width = cinfo->image_width;
+ cinfo->output_height = cinfo->image_height;
+ /* jdinput.c has already initialized DCT_scaled_size to DCTSIZE,
+ * and has computed unscaled downsampled_width and downsampled_height.
+ */
+
+#endif /* IDCT_SCALING_SUPPORTED */
+
+ /* Report number of components in selected colorspace. */
+ /* Probably this should be in the color conversion module... */
+ switch (cinfo->out_color_space) {
+ case JCS_GRAYSCALE:
+ cinfo->out_color_components = 1;
+ break;
+ case JCS_RGB:
+#if RGB_PIXELSIZE != 3
+ cinfo->out_color_components = RGB_PIXELSIZE;
+ break;
+#endif /* else share code with YCbCr */
+ case JCS_YCbCr:
+ cinfo->out_color_components = 3;
+ break;
+ case JCS_CMYK:
+ case JCS_YCCK:
+ cinfo->out_color_components = 4;
+ break;
+ default: /* else must be same colorspace as in file */
+ cinfo->out_color_components = cinfo->num_components;
+ break;
+ }
+ cinfo->output_components = (cinfo->quantize_colors ? 1 :
+ cinfo->out_color_components);
+
+ /* See if upsampler will want to emit more than one row at a time */
+ if (use_merged_upsample(cinfo))
+ cinfo->rec_outbuf_height = cinfo->max_v_samp_factor;
+ else
+ cinfo->rec_outbuf_height = 1;
+}
+
+
+/*
+ * Several decompression processes need to range-limit values to the range
+ * 0..MAXJSAMPLE; the input value may fall somewhat outside this range
+ * due to noise introduced by quantization, roundoff error, etc. These
+ * processes are inner loops and need to be as fast as possible. On most
+ * machines, particularly CPUs with pipelines or instruction prefetch,
+ * a (subscript-check-less) C table lookup
+ * x = sample_range_limit[x];
+ * is faster than explicit tests
+ * if (x < 0) x = 0;
+ * else if (x > MAXJSAMPLE) x = MAXJSAMPLE;
+ * These processes all use a common table prepared by the routine below.
+ *
+ * For most steps we can mathematically guarantee that the initial value
+ * of x is within MAXJSAMPLE+1 of the legal range, so a table running from
+ * -(MAXJSAMPLE+1) to 2*MAXJSAMPLE+1 is sufficient. But for the initial
+ * limiting step (just after the IDCT), a wildly out-of-range value is
+ * possible if the input data is corrupt. To avoid any chance of indexing
+ * off the end of memory and getting a bad-pointer trap, we perform the
+ * post-IDCT limiting thus:
+ * x = range_limit[x & MASK];
+ * where MASK is 2 bits wider than legal sample data, ie 10 bits for 8-bit
+ * samples. Under normal circumstances this is more than enough range and
+ * a correct output will be generated; with bogus input data the mask will
+ * cause wraparound, and we will safely generate a bogus-but-in-range output.
+ * For the post-IDCT step, we want to convert the data from signed to unsigned
+ * representation by adding CENTERJSAMPLE at the same time that we limit it.
+ * So the post-IDCT limiting table ends up looking like this:
+ * CENTERJSAMPLE,CENTERJSAMPLE+1,...,MAXJSAMPLE,
+ * MAXJSAMPLE (repeat 2*(MAXJSAMPLE+1)-CENTERJSAMPLE times),
+ * 0 (repeat 2*(MAXJSAMPLE+1)-CENTERJSAMPLE times),
+ * 0,1,...,CENTERJSAMPLE-1
+ * Negative inputs select values from the upper half of the table after
+ * masking.
+ *
+ * We can save some space by overlapping the start of the post-IDCT table
+ * with the simpler range limiting table. The post-IDCT table begins at
+ * sample_range_limit + CENTERJSAMPLE.
+ *
+ * Note that the table is allocated in near data space on PCs; it's small
+ * enough and used often enough to justify this.
+ */
+
+LOCAL void
+prepare_range_limit_table (j_decompress_ptr cinfo)
+/* Allocate and fill in the sample_range_limit table */
+{
+ JSAMPLE * table;
+ int i;
+
+ table = (JSAMPLE *)
+ (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+ (5 * (MAXJSAMPLE+1) + CENTERJSAMPLE) * SIZEOF(JSAMPLE));
+ table += (MAXJSAMPLE+1); /* allow negative subscripts of simple table */
+ cinfo->sample_range_limit = table;
+ /* First segment of "simple" table: limit[x] = 0 for x < 0 */
+ MEMZERO(table - (MAXJSAMPLE+1), (MAXJSAMPLE+1) * SIZEOF(JSAMPLE));
+ /* Main part of "simple" table: limit[x] = x */
+ for (i = 0; i <= MAXJSAMPLE; i++)
+ table[i] = (JSAMPLE) i;
+ table += CENTERJSAMPLE; /* Point to where post-IDCT table starts */
+ /* End of simple table, rest of first half of post-IDCT table */
+ for (i = CENTERJSAMPLE; i < 2*(MAXJSAMPLE+1); i++)
+ table[i] = MAXJSAMPLE;
+ /* Second half of post-IDCT table */
+ MEMZERO(table + (2 * (MAXJSAMPLE+1)),
+ (2 * (MAXJSAMPLE+1) - CENTERJSAMPLE) * SIZEOF(JSAMPLE));
+ MEMCOPY(table + (4 * (MAXJSAMPLE+1) - CENTERJSAMPLE),
+ cinfo->sample_range_limit, CENTERJSAMPLE * SIZEOF(JSAMPLE));
+}
+
+
+/*
+ * Master selection of decompression modules.
+ * This is done once at jpeg_start_decompress time. We determine
+ * which modules will be used and give them appropriate initialization calls.
+ * We also initialize the decompressor input side to begin consuming data.
+ *
+ * Since jpeg_read_header has finished, we know what is in the SOF
+ * and (first) SOS markers. We also have all the application parameter
+ * settings.
+ */
+
+LOCAL void
+master_selection (j_decompress_ptr cinfo)
+{
+ my_master_ptr master = (my_master_ptr) cinfo->master;
+ boolean use_c_buffer;
+ long samplesperrow;
+ JDIMENSION jd_samplesperrow;
+
+ /* Initialize dimensions and other stuff */
+ jpeg_calc_output_dimensions(cinfo);
+ prepare_range_limit_table(cinfo);
+
+ /* Width of an output scanline must be representable as JDIMENSION. */
+ samplesperrow = (long) cinfo->output_width * (long) cinfo->out_color_components;
+ jd_samplesperrow = (JDIMENSION) samplesperrow;
+ if ((long) jd_samplesperrow != samplesperrow)
+ ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
+
+ /* Initialize my private state */
+ master->pass_number = 0;
+ master->using_merged_upsample = use_merged_upsample(cinfo);
+
+ /* Color quantizer selection */
+ master->quantizer_1pass = NULL;
+ master->quantizer_2pass = NULL;
+ /* No mode changes if not using buffered-image mode. */
+ if (! cinfo->quantize_colors || ! cinfo->buffered_image) {
+ cinfo->enable_1pass_quant = FALSE;
+ cinfo->enable_external_quant = FALSE;
+ cinfo->enable_2pass_quant = FALSE;
+ }
+ if (cinfo->quantize_colors) {
+ if (cinfo->raw_data_out)
+ ERREXIT(cinfo, JERR_NOTIMPL);
+ /* 2-pass quantizer only works in 3-component color space. */
+ if (cinfo->out_color_components != 3) {
+ cinfo->enable_1pass_quant = TRUE;
+ cinfo->enable_external_quant = FALSE;
+ cinfo->enable_2pass_quant = FALSE;
+ cinfo->colormap = NULL;
+ } else if (cinfo->colormap != NULL) {
+ cinfo->enable_external_quant = TRUE;
+ } else if (cinfo->two_pass_quantize) {
+ cinfo->enable_2pass_quant = TRUE;
+ } else {
+ cinfo->enable_1pass_quant = TRUE;
+ }
+
+ if (cinfo->enable_1pass_quant) {
+#ifdef QUANT_1PASS_SUPPORTED
+ jinit_1pass_quantizer(cinfo);
+ master->quantizer_1pass = cinfo->cquantize;
+#else
+ ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+ }
+
+ /* We use the 2-pass code to map to external colormaps. */
+ if (cinfo->enable_2pass_quant || cinfo->enable_external_quant) {
+#ifdef QUANT_2PASS_SUPPORTED
+ jinit_2pass_quantizer(cinfo);
+ master->quantizer_2pass = cinfo->cquantize;
+#else
+ ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+ }
+ /* If both quantizers are initialized, the 2-pass one is left active;
+ * this is necessary for starting with quantization to an external map.
+ */
+ }
+
+ /* Post-processing: in particular, color conversion first */
+ if (! cinfo->raw_data_out) {
+ if (master->using_merged_upsample) {
+#ifdef UPSAMPLE_MERGING_SUPPORTED
+ jinit_merged_upsampler(cinfo); /* does color conversion too */
+#else
+ ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+ } else {
+ jinit_color_deconverter(cinfo);
+ jinit_upsampler(cinfo);
+ }
+ jinit_d_post_controller(cinfo, cinfo->enable_2pass_quant);
+ }
+ /* Inverse DCT */
+ jinit_inverse_dct(cinfo);
+ /* Entropy decoding: either Huffman or arithmetic coding. */
+ if (cinfo->arith_code) {
+ ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
+ } else {
+ if (cinfo->progressive_mode) {
+#ifdef D_PROGRESSIVE_SUPPORTED
+ jinit_phuff_decoder(cinfo);
+#else
+ ERREXIT(cinfo, JERR_NO_PROGRESSIVE);
+#endif
+ } else
+ jinit_huff_decoder(cinfo);
+ }
+
+ /* Initialize principal buffer controllers. */
+ use_c_buffer = cinfo->inputctl->has_multiple_scans || cinfo->buffered_image;
+ jinit_d_coef_controller(cinfo, use_c_buffer);
+
+ if (! cinfo->raw_data_out)
+ jinit_d_main_controller(cinfo, FALSE /* never need full buffer here */);
+
+ /* We can now tell the memory manager to allocate virtual arrays. */
+ (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
+
+ /* Initialize input side of decompressor to consume first scan. */
+ (*cinfo->inputctl->start_input_pass) (cinfo);
+
+#ifdef D_MULTISCAN_FILES_SUPPORTED
+ /* If jpeg_start_decompress will read the whole file, initialize
+ * progress monitoring appropriately. The input step is counted
+ * as one pass.
+ */
+ if (cinfo->progress != NULL && ! cinfo->buffered_image &&
+ cinfo->inputctl->has_multiple_scans) {
+ int nscans;
+ /* Estimate number of scans to set pass_limit. */
+ if (cinfo->progressive_mode) {
+ /* Arbitrarily estimate 2 interleaved DC scans + 3 AC scans/component. */
+ nscans = 2 + 3 * cinfo->num_components;
+ } else {
+ /* For a nonprogressive multiscan file, estimate 1 scan per component. */
+ nscans = cinfo->num_components;
+ }
+ cinfo->progress->pass_counter = 0L;
+ cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows * nscans;
+ cinfo->progress->completed_passes = 0;
+ cinfo->progress->total_passes = (cinfo->enable_2pass_quant ? 3 : 2);
+ /* Count the input pass as done */
+ master->pass_number++;
+ }
+#endif /* D_MULTISCAN_FILES_SUPPORTED */
+}
+
+
+/*
+ * Per-pass setup.
+ * This is called at the beginning of each output pass. We determine which
+ * modules will be active during this pass and give them appropriate
+ * start_pass calls. We also set is_dummy_pass to indicate whether this
+ * is a "real" output pass or a dummy pass for color quantization.
+ * (In the latter case, jdapi.c will crank the pass to completion.)
+ */
+
+METHODDEF void
+prepare_for_output_pass (j_decompress_ptr cinfo)
+{
+ my_master_ptr master = (my_master_ptr) cinfo->master;
+
+ if (master->pub.is_dummy_pass) {
+#ifdef QUANT_2PASS_SUPPORTED
+ /* Final pass of 2-pass quantization */
+ master->pub.is_dummy_pass = FALSE;
+ (*cinfo->cquantize->start_pass) (cinfo, FALSE);
+ (*cinfo->post->start_pass) (cinfo, JBUF_CRANK_DEST);
+ (*cinfo->main->start_pass) (cinfo, JBUF_CRANK_DEST);
+#else
+ ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif /* QUANT_2PASS_SUPPORTED */
+ } else {
+ if (cinfo->quantize_colors && cinfo->colormap == NULL) {
+ /* Select new quantization method */
+ if (cinfo->two_pass_quantize && cinfo->enable_2pass_quant) {
+ cinfo->cquantize = master->quantizer_2pass;
+ master->pub.is_dummy_pass = TRUE;
+ } else if (cinfo->enable_1pass_quant) {
+ cinfo->cquantize = master->quantizer_1pass;
+ } else {
+ ERREXIT(cinfo, JERR_MODE_CHANGE);
+ }
+ }
+ (*cinfo->idct->start_pass) (cinfo);
+ (*cinfo->coef->start_output_pass) (cinfo);
+ if (! cinfo->raw_data_out) {
+ if (! master->using_merged_upsample)
+ (*cinfo->cconvert->start_pass) (cinfo);
+ (*cinfo->upsample->start_pass) (cinfo);
+ if (cinfo->quantize_colors)
+ (*cinfo->cquantize->start_pass) (cinfo, master->pub.is_dummy_pass);
+ (*cinfo->post->start_pass) (cinfo,
+ (master->pub.is_dummy_pass ? JBUF_SAVE_AND_PASS : JBUF_PASS_THRU));
+ (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU);
+ }
+ }
+
+ /* Set up progress monitor's pass info if present */
+ if (cinfo->progress != NULL) {
+ cinfo->progress->completed_passes = master->pass_number;
+ cinfo->progress->total_passes = master->pass_number +
+ (master->pub.is_dummy_pass ? 2 : 1);
+ /* In buffered-image mode, we assume one more output pass if EOI not
+ * yet reached, but no more passes if EOI has been reached.
+ */
+ if (cinfo->buffered_image && ! cinfo->inputctl->eoi_reached) {
+ cinfo->progress->total_passes += (cinfo->enable_2pass_quant ? 2 : 1);
+ }
+ }
+}
+
+
+/*
+ * Finish up at end of an output pass.
+ */
+
+METHODDEF void
+finish_output_pass (j_decompress_ptr cinfo)
+{
+ my_master_ptr master = (my_master_ptr) cinfo->master;
+
+ if (cinfo->quantize_colors)
+ (*cinfo->cquantize->finish_pass) (cinfo);
+ master->pass_number++;
+}
+
+
+#ifdef D_MULTISCAN_FILES_SUPPORTED
+
+/*
+ * Switch to a new external colormap between output passes.
+ */
+
+GLOBAL void
+jpeg_new_colormap (j_decompress_ptr cinfo)
+{
+ my_master_ptr master = (my_master_ptr) cinfo->master;
+
+ /* Prevent application from calling me at wrong times */
+ if (cinfo->global_state != DSTATE_BUFIMAGE)
+ ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+
+ if (cinfo->quantize_colors && cinfo->enable_external_quant &&
+ cinfo->colormap != NULL) {
+ /* Select 2-pass quantizer for external colormap use */
+ cinfo->cquantize = master->quantizer_2pass;
+ /* Notify quantizer of colormap change */
+ (*cinfo->cquantize->new_color_map) (cinfo);
+ master->pub.is_dummy_pass = FALSE; /* just in case */
+ } else
+ ERREXIT(cinfo, JERR_MODE_CHANGE);
+}
+
+#endif /* D_MULTISCAN_FILES_SUPPORTED */
+
+
+/*
+ * Initialize master decompression control and select active modules.
+ * This is performed at the start of jpeg_start_decompress.
+ */
+
+GLOBAL void
+jinit_master_decompress (j_decompress_ptr cinfo)
+{
+ my_master_ptr master;
+
+ master = (my_master_ptr)
+ (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+ SIZEOF(my_decomp_master));
+ cinfo->master = (struct jpeg_decomp_master *) master;
+ master->pub.prepare_for_output_pass = prepare_for_output_pass;
+ master->pub.finish_output_pass = finish_output_pass;
+
+ master->pub.is_dummy_pass = FALSE;
+
+ master_selection(cinfo);
+}
+
projects / xonotic / netradiant.git / blobdiff