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- #include "jinclude.h"
- #include "jdmainct.h"
- #include "jdcoefct.h"
- #include "jdmaster.h"
- #include "jdmerge.h"
- #include "jdsample.h"
- #include "jmemsys.h"
- LOCAL(boolean) output_pass_setup(j_decompress_ptr cinfo);
- GLOBAL(boolean)
- jpeg_start_decompress(j_decompress_ptr cinfo)
- {
- if (cinfo->global_state == DSTATE_READY) {
-
- jinit_master_decompress(cinfo);
- if (cinfo->buffered_image) {
-
- cinfo->global_state = DSTATE_BUFIMAGE;
- return TRUE;
- }
- cinfo->global_state = DSTATE_PRELOAD;
- }
- if (cinfo->global_state == DSTATE_PRELOAD) {
-
- if (cinfo->inputctl->has_multiple_scans) {
- #ifdef D_MULTISCAN_FILES_SUPPORTED
- for (;;) {
- int retcode;
-
- if (cinfo->progress != NULL)
- (*cinfo->progress->progress_monitor) ((j_common_ptr)cinfo);
-
- retcode = (*cinfo->inputctl->consume_input) (cinfo);
- if (retcode == JPEG_SUSPENDED)
- return FALSE;
- if (retcode == JPEG_REACHED_EOI)
- break;
-
- if (cinfo->progress != NULL &&
- (retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) {
- if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) {
-
- cinfo->progress->pass_limit += (long)cinfo->total_iMCU_rows;
- }
- }
- }
- #else
- ERREXIT(cinfo, JERR_NOT_COMPILED);
- #endif
- }
- cinfo->output_scan_number = cinfo->input_scan_number;
- } else if (cinfo->global_state != DSTATE_PRESCAN)
- ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
-
- return output_pass_setup(cinfo);
- }
- LOCAL(boolean)
- output_pass_setup(j_decompress_ptr cinfo)
- {
- if (cinfo->global_state != DSTATE_PRESCAN) {
-
- (*cinfo->master->prepare_for_output_pass) (cinfo);
- cinfo->output_scanline = 0;
- cinfo->global_state = DSTATE_PRESCAN;
- }
-
- while (cinfo->master->is_dummy_pass) {
- #ifdef QUANT_2PASS_SUPPORTED
-
- while (cinfo->output_scanline < cinfo->output_height) {
- JDIMENSION last_scanline;
-
- if (cinfo->progress != NULL) {
- cinfo->progress->pass_counter = (long)cinfo->output_scanline;
- cinfo->progress->pass_limit = (long)cinfo->output_height;
- (*cinfo->progress->progress_monitor) ((j_common_ptr)cinfo);
- }
-
- last_scanline = cinfo->output_scanline;
- (*cinfo->main->process_data) (cinfo, (JSAMPARRAY)NULL,
- &cinfo->output_scanline, (JDIMENSION)0);
- if (cinfo->output_scanline == last_scanline)
- return FALSE;
- }
-
- (*cinfo->master->finish_output_pass) (cinfo);
- (*cinfo->master->prepare_for_output_pass) (cinfo);
- cinfo->output_scanline = 0;
- #else
- ERREXIT(cinfo, JERR_NOT_COMPILED);
- #endif
- }
-
- cinfo->global_state = cinfo->raw_data_out ? DSTATE_RAW_OK : DSTATE_SCANNING;
- return TRUE;
- }
- GLOBAL(void)
- jpeg_crop_scanline(j_decompress_ptr cinfo, JDIMENSION *xoffset,
- JDIMENSION *width)
- {
- int ci, align, orig_downsampled_width;
- JDIMENSION input_xoffset;
- boolean reinit_upsampler = FALSE;
- jpeg_component_info *compptr;
- if (cinfo->global_state != DSTATE_SCANNING || cinfo->output_scanline != 0)
- ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
- if (!xoffset || !width)
- ERREXIT(cinfo, JERR_BAD_CROP_SPEC);
-
- if (*width == 0 || *xoffset + *width > cinfo->output_width)
- ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
-
- if (*width == cinfo->output_width)
- return;
-
- if (cinfo->comps_in_scan == 1 && cinfo->num_components == 1)
- align = cinfo->_min_DCT_scaled_size;
- else
- align = cinfo->_min_DCT_scaled_size * cinfo->max_h_samp_factor;
-
- input_xoffset = *xoffset;
- *xoffset = (input_xoffset / align) * align;
-
- *width = *width + input_xoffset - *xoffset;
- cinfo->output_width = *width;
-
- cinfo->master->first_iMCU_col = (JDIMENSION)(long)(*xoffset) / (long)align;
- cinfo->master->last_iMCU_col =
- (JDIMENSION)jdiv_round_up((long)(*xoffset + cinfo->output_width),
- (long)align) - 1;
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
- ci++, compptr++) {
- int hsf = (cinfo->comps_in_scan == 1 && cinfo->num_components == 1) ?
- 1 : compptr->h_samp_factor;
-
- orig_downsampled_width = compptr->downsampled_width;
- compptr->downsampled_width =
- (JDIMENSION)jdiv_round_up((long)(cinfo->output_width *
- compptr->h_samp_factor),
- (long)cinfo->max_h_samp_factor);
- if (compptr->downsampled_width < 2 && orig_downsampled_width >= 2)
- reinit_upsampler = TRUE;
-
- cinfo->master->first_MCU_col[ci] =
- (JDIMENSION)(long)(*xoffset * hsf) / (long)align;
- cinfo->master->last_MCU_col[ci] =
- (JDIMENSION)jdiv_round_up((long)((*xoffset + cinfo->output_width) * hsf),
- (long)align) - 1;
- }
- if (reinit_upsampler) {
- cinfo->master->jinit_upsampler_no_alloc = TRUE;
- jinit_upsampler(cinfo);
- cinfo->master->jinit_upsampler_no_alloc = FALSE;
- }
- }
- GLOBAL(JDIMENSION)
- jpeg_read_scanlines(j_decompress_ptr cinfo, JSAMPARRAY scanlines,
- JDIMENSION max_lines)
- {
- JDIMENSION row_ctr;
- if (cinfo->global_state != DSTATE_SCANNING)
- ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
- if (cinfo->output_scanline >= cinfo->output_height) {
- WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
- return 0;
- }
-
- if (cinfo->progress != NULL) {
- cinfo->progress->pass_counter = (long)cinfo->output_scanline;
- cinfo->progress->pass_limit = (long)cinfo->output_height;
- (*cinfo->progress->progress_monitor) ((j_common_ptr)cinfo);
- }
-
- row_ctr = 0;
- (*cinfo->main->process_data) (cinfo, scanlines, &row_ctr, max_lines);
- cinfo->output_scanline += row_ctr;
- return row_ctr;
- }
- LOCAL(void)
- noop_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
- JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows)
- {
- }
- LOCAL(void)
- noop_quantize(j_decompress_ptr cinfo, JSAMPARRAY input_buf,
- JSAMPARRAY output_buf, int num_rows)
- {
- }
- LOCAL(void)
- read_and_discard_scanlines(j_decompress_ptr cinfo, JDIMENSION num_lines)
- {
- JDIMENSION n;
- my_master_ptr master = (my_master_ptr)cinfo->master;
- JSAMPARRAY scanlines = NULL;
- void (*color_convert) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
- JDIMENSION input_row, JSAMPARRAY output_buf,
- int num_rows) = NULL;
- void (*color_quantize) (j_decompress_ptr cinfo, JSAMPARRAY input_buf,
- JSAMPARRAY output_buf, int num_rows) = NULL;
- if (cinfo->cconvert && cinfo->cconvert->color_convert) {
- color_convert = cinfo->cconvert->color_convert;
- cinfo->cconvert->color_convert = noop_convert;
- }
- if (cinfo->cquantize && cinfo->cquantize->color_quantize) {
- color_quantize = cinfo->cquantize->color_quantize;
- cinfo->cquantize->color_quantize = noop_quantize;
- }
- if (master->using_merged_upsample && cinfo->max_v_samp_factor == 2) {
- my_merged_upsample_ptr upsample = (my_merged_upsample_ptr)cinfo->upsample;
- scanlines = &upsample->spare_row;
- }
- for (n = 0; n < num_lines; n++)
- jpeg_read_scanlines(cinfo, scanlines, 1);
- if (color_convert)
- cinfo->cconvert->color_convert = color_convert;
- if (color_quantize)
- cinfo->cquantize->color_quantize = color_quantize;
- }
- LOCAL(void)
- increment_simple_rowgroup_ctr(j_decompress_ptr cinfo, JDIMENSION rows)
- {
- JDIMENSION rows_left;
- my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
- my_master_ptr master = (my_master_ptr)cinfo->master;
- if (master->using_merged_upsample && cinfo->max_v_samp_factor == 2) {
- read_and_discard_scanlines(cinfo, rows);
- return;
- }
-
- main_ptr->rowgroup_ctr += rows / cinfo->max_v_samp_factor;
-
- rows_left = rows % cinfo->max_v_samp_factor;
- cinfo->output_scanline += rows - rows_left;
- read_and_discard_scanlines(cinfo, rows_left);
- }
- GLOBAL(JDIMENSION)
- jpeg_skip_scanlines(j_decompress_ptr cinfo, JDIMENSION num_lines)
- {
- my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
- my_coef_ptr coef = (my_coef_ptr)cinfo->coef;
- my_master_ptr master = (my_master_ptr)cinfo->master;
- my_upsample_ptr upsample = (my_upsample_ptr)cinfo->upsample;
- JDIMENSION i, x;
- int y;
- JDIMENSION lines_per_iMCU_row, lines_left_in_iMCU_row, lines_after_iMCU_row;
- JDIMENSION lines_to_skip, lines_to_read;
-
- if (cinfo->quantize_colors && cinfo->two_pass_quantize)
- ERREXIT(cinfo, JERR_NOTIMPL);
- if (cinfo->global_state != DSTATE_SCANNING)
- ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
-
- if (cinfo->output_scanline + num_lines >= cinfo->output_height) {
- num_lines = cinfo->output_height - cinfo->output_scanline;
- cinfo->output_scanline = cinfo->output_height;
- (*cinfo->inputctl->finish_input_pass) (cinfo);
- cinfo->inputctl->eoi_reached = TRUE;
- return num_lines;
- }
- if (num_lines == 0)
- return 0;
- lines_per_iMCU_row = cinfo->_min_DCT_scaled_size * cinfo->max_v_samp_factor;
- lines_left_in_iMCU_row =
- (lines_per_iMCU_row - (cinfo->output_scanline % lines_per_iMCU_row)) %
- lines_per_iMCU_row;
- lines_after_iMCU_row = num_lines - lines_left_in_iMCU_row;
-
- if (cinfo->upsample->need_context_rows) {
-
- if ((num_lines < lines_left_in_iMCU_row + 1) ||
- (lines_left_in_iMCU_row <= 1 && main_ptr->buffer_full &&
- lines_after_iMCU_row < lines_per_iMCU_row + 1)) {
- read_and_discard_scanlines(cinfo, num_lines);
- return num_lines;
- }
-
- if (lines_left_in_iMCU_row <= 1 && main_ptr->buffer_full) {
- cinfo->output_scanline += lines_left_in_iMCU_row + lines_per_iMCU_row;
- lines_after_iMCU_row -= lines_per_iMCU_row;
- } else {
- cinfo->output_scanline += lines_left_in_iMCU_row;
- }
-
- if (main_ptr->iMCU_row_ctr == 0 ||
- (main_ptr->iMCU_row_ctr == 1 && lines_left_in_iMCU_row > 2))
- set_wraparound_pointers(cinfo);
- main_ptr->buffer_full = FALSE;
- main_ptr->rowgroup_ctr = 0;
- main_ptr->context_state = CTX_PREPARE_FOR_IMCU;
- if (!master->using_merged_upsample) {
- upsample->next_row_out = cinfo->max_v_samp_factor;
- upsample->rows_to_go = cinfo->output_height - cinfo->output_scanline;
- }
- }
-
- else {
- if (num_lines < lines_left_in_iMCU_row) {
- increment_simple_rowgroup_ctr(cinfo, num_lines);
- return num_lines;
- } else {
- cinfo->output_scanline += lines_left_in_iMCU_row;
- main_ptr->buffer_full = FALSE;
- main_ptr->rowgroup_ctr = 0;
- if (!master->using_merged_upsample) {
- upsample->next_row_out = cinfo->max_v_samp_factor;
- upsample->rows_to_go = cinfo->output_height - cinfo->output_scanline;
- }
- }
- }
-
- if (cinfo->upsample->need_context_rows)
- lines_to_skip = ((lines_after_iMCU_row - 1) / lines_per_iMCU_row) *
- lines_per_iMCU_row;
- else
- lines_to_skip = (lines_after_iMCU_row / lines_per_iMCU_row) *
- lines_per_iMCU_row;
-
- lines_to_read = lines_after_iMCU_row - lines_to_skip;
-
- if (cinfo->inputctl->has_multiple_scans) {
- if (cinfo->upsample->need_context_rows) {
- cinfo->output_scanline += lines_to_skip;
- cinfo->output_iMCU_row += lines_to_skip / lines_per_iMCU_row;
- main_ptr->iMCU_row_ctr += lines_to_skip / lines_per_iMCU_row;
-
- read_and_discard_scanlines(cinfo, lines_to_read);
- } else {
- cinfo->output_scanline += lines_to_skip;
- cinfo->output_iMCU_row += lines_to_skip / lines_per_iMCU_row;
- increment_simple_rowgroup_ctr(cinfo, lines_to_read);
- }
- if (!master->using_merged_upsample)
- upsample->rows_to_go = cinfo->output_height - cinfo->output_scanline;
- return num_lines;
- }
-
- for (i = 0; i < lines_to_skip; i += lines_per_iMCU_row) {
- for (y = 0; y < coef->MCU_rows_per_iMCU_row; y++) {
- for (x = 0; x < cinfo->MCUs_per_row; x++) {
-
- (*cinfo->entropy->decode_mcu) (cinfo, NULL);
- }
- }
- cinfo->input_iMCU_row++;
- cinfo->output_iMCU_row++;
- if (cinfo->input_iMCU_row < cinfo->total_iMCU_rows)
- start_iMCU_row(cinfo);
- else
- (*cinfo->inputctl->finish_input_pass) (cinfo);
- }
- cinfo->output_scanline += lines_to_skip;
- if (cinfo->upsample->need_context_rows) {
-
- main_ptr->iMCU_row_ctr += lines_to_skip / lines_per_iMCU_row;
-
- read_and_discard_scanlines(cinfo, lines_to_read);
- } else {
- increment_simple_rowgroup_ctr(cinfo, lines_to_read);
- }
-
- if (!master->using_merged_upsample)
- upsample->rows_to_go = cinfo->output_height - cinfo->output_scanline;
-
- return num_lines;
- }
- GLOBAL(JDIMENSION)
- jpeg_read_raw_data(j_decompress_ptr cinfo, JSAMPIMAGE data,
- JDIMENSION max_lines)
- {
- JDIMENSION lines_per_iMCU_row;
- if (cinfo->global_state != DSTATE_RAW_OK)
- ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
- if (cinfo->output_scanline >= cinfo->output_height) {
- WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
- return 0;
- }
-
- if (cinfo->progress != NULL) {
- cinfo->progress->pass_counter = (long)cinfo->output_scanline;
- cinfo->progress->pass_limit = (long)cinfo->output_height;
- (*cinfo->progress->progress_monitor) ((j_common_ptr)cinfo);
- }
-
- lines_per_iMCU_row = cinfo->max_v_samp_factor * cinfo->_min_DCT_scaled_size;
- if (max_lines < lines_per_iMCU_row)
- ERREXIT(cinfo, JERR_BUFFER_SIZE);
-
- if (!(*cinfo->coef->decompress_data) (cinfo, data))
- return 0;
-
- cinfo->output_scanline += lines_per_iMCU_row;
- return lines_per_iMCU_row;
- }
- #ifdef D_MULTISCAN_FILES_SUPPORTED
- GLOBAL(boolean)
- jpeg_start_output(j_decompress_ptr cinfo, int scan_number)
- {
- if (cinfo->global_state != DSTATE_BUFIMAGE &&
- cinfo->global_state != DSTATE_PRESCAN)
- ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
-
- if (scan_number <= 0)
- scan_number = 1;
- if (cinfo->inputctl->eoi_reached && scan_number > cinfo->input_scan_number)
- scan_number = cinfo->input_scan_number;
- cinfo->output_scan_number = scan_number;
-
- return output_pass_setup(cinfo);
- }
- GLOBAL(boolean)
- jpeg_finish_output(j_decompress_ptr cinfo)
- {
- if ((cinfo->global_state == DSTATE_SCANNING ||
- cinfo->global_state == DSTATE_RAW_OK) && cinfo->buffered_image) {
-
-
- (*cinfo->master->finish_output_pass) (cinfo);
- cinfo->global_state = DSTATE_BUFPOST;
- } else if (cinfo->global_state != DSTATE_BUFPOST) {
-
- ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
- }
-
- while (cinfo->input_scan_number <= cinfo->output_scan_number &&
- !cinfo->inputctl->eoi_reached) {
- if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED)
- return FALSE;
- }
- cinfo->global_state = DSTATE_BUFIMAGE;
- return TRUE;
- }
- #endif
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