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- #define JPEG_INTERNALS
- #include "jinclude.h"
- #include "jpeglib.h"
- typedef struct {
- struct jpeg_decomp_master pub;
- int pass_number;
- boolean using_merged_upsample;
-
- struct jpeg_color_quantizer * quantizer_1pass;
- struct jpeg_color_quantizer * quantizer_2pass;
- } my_decomp_master;
- typedef my_decomp_master * my_master_ptr;
- LOCAL boolean
- use_merged_upsample (j_decompress_ptr cinfo)
- {
- #ifdef UPSAMPLE_MERGING_SUPPORTED
-
- if (cinfo->do_fancy_upsampling || cinfo->CCIR601_sampling)
- return FALSE;
-
- 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;
-
- 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;
-
- 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;
-
- return TRUE;
- #else
- return FALSE;
- #endif
- }
- GLOBAL void
- jpeg_calc_output_dimensions (j_decompress_ptr cinfo)
- {
- #if 0
- int ci;
- jpeg_component_info *compptr;
- #endif
-
- if (cinfo->global_state != DSTATE_READY)
- ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
- #ifdef IDCT_SCALING_SUPPORTED
-
- if (cinfo->scale_num * 8 <= cinfo->scale_denom) {
-
- 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) {
-
- 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) {
-
- 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 {
-
- cinfo->output_width = cinfo->image_width;
- cinfo->output_height = cinfo->image_height;
- cinfo->min_DCT_scaled_size = DCTSIZE;
- }
-
- 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;
- }
-
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
- ci++, compptr++) {
-
- 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
-
- cinfo->output_width = cinfo->image_width;
- cinfo->output_height = cinfo->image_height;
-
- #endif
-
-
- 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
- case JCS_YCbCr:
- cinfo->out_color_components = 3;
- break;
- case JCS_CMYK:
- case JCS_YCCK:
- cinfo->out_color_components = 4;
- break;
- default:
- cinfo->out_color_components = cinfo->num_components;
- break;
- }
- cinfo->output_components = (cinfo->quantize_colors ? 1 :
- cinfo->out_color_components);
-
- if (use_merged_upsample(cinfo))
- cinfo->rec_outbuf_height = cinfo->max_v_samp_factor;
- else
- cinfo->rec_outbuf_height = 1;
- }
- LOCAL void
- prepare_range_limit_table (j_decompress_ptr cinfo)
- {
- 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);
- cinfo->sample_range_limit = table;
-
- MEMZERO(table - (MAXJSAMPLE+1), (MAXJSAMPLE+1) * SIZEOF(JSAMPLE));
-
- for (i = 0; i <= MAXJSAMPLE; i++)
- table[i] = (JSAMPLE) i;
- table += CENTERJSAMPLE;
-
- for (i = CENTERJSAMPLE; i < 2*(MAXJSAMPLE+1); i++)
- table[i] = MAXJSAMPLE;
-
- MEMZERO(table + (2 * (MAXJSAMPLE+1)),
- (2 * (MAXJSAMPLE+1) - CENTERJSAMPLE) * SIZEOF(JSAMPLE));
- MEMCOPY(table + (4 * (MAXJSAMPLE+1) - CENTERJSAMPLE),
- cinfo->sample_range_limit, CENTERJSAMPLE * SIZEOF(JSAMPLE));
- }
- 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;
-
- jpeg_calc_output_dimensions(cinfo);
- prepare_range_limit_table(cinfo);
-
- samplesperrow = (long) cinfo->output_width * (long) cinfo->out_color_components;
- jd_samplesperrow = (JDIMENSION) samplesperrow;
- if ((long) jd_samplesperrow != samplesperrow)
- ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
-
- master->pass_number = 0;
- master->using_merged_upsample = use_merged_upsample(cinfo);
-
- master->quantizer_1pass = NULL;
- master->quantizer_2pass = NULL;
-
- 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);
-
- 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
- }
-
- 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 (! cinfo->raw_data_out) {
- if (master->using_merged_upsample) {
- #ifdef UPSAMPLE_MERGING_SUPPORTED
- jinit_merged_upsampler(cinfo);
- #else
- ERREXIT(cinfo, JERR_NOT_COMPILED);
- #endif
- } else {
- jinit_color_deconverter(cinfo);
- jinit_upsampler(cinfo);
- }
- jinit_d_post_controller(cinfo, cinfo->enable_2pass_quant);
- }
-
- jinit_inverse_dct(cinfo);
-
- 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_NOT_COMPILED);
- #endif
- } else
- jinit_huff_decoder(cinfo);
- }
-
- 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 );
-
- (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
-
- (*cinfo->inputctl->start_input_pass) (cinfo);
- #ifdef D_MULTISCAN_FILES_SUPPORTED
-
- if (cinfo->progress != NULL && ! cinfo->buffered_image &&
- cinfo->inputctl->has_multiple_scans) {
- int nscans;
-
- if (cinfo->progressive_mode) {
-
- nscans = 2 + 3 * cinfo->num_components;
- } else {
-
- 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);
-
- master->pass_number++;
- }
- #endif
- }
- 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
-
- 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
- } else {
- if (cinfo->quantize_colors && cinfo->colormap == NULL) {
-
- 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);
- }
- }
-
- 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);
-
- if (cinfo->buffered_image && ! cinfo->inputctl->eoi_reached) {
- cinfo->progress->total_passes += (cinfo->enable_2pass_quant ? 2 : 1);
- }
- }
- }
- 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
- GLOBAL void
- jpeg_new_colormap (j_decompress_ptr cinfo)
- {
- my_master_ptr master = (my_master_ptr) cinfo->master;
-
- 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) {
-
- cinfo->cquantize = master->quantizer_2pass;
-
- (*cinfo->cquantize->new_color_map) (cinfo);
- master->pub.is_dummy_pass = FALSE;
- } else
- ERREXIT(cinfo, JERR_MODE_CHANGE);
- }
- #endif
- 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);
- }
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