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Diffstat (limited to '')
| -rw-r--r-- | libjpegtwrp/jdapistd.c | 397 |
1 files changed, 0 insertions, 397 deletions
diff --git a/libjpegtwrp/jdapistd.c b/libjpegtwrp/jdapistd.c deleted file mode 100644 index e1233df36..000000000 --- a/libjpegtwrp/jdapistd.c +++ /dev/null @@ -1,397 +0,0 @@ -/* - * jdapistd.c - * - * Copyright (C) 1994-1996, 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 application interface code for the decompression half - * of the JPEG library. These are the "standard" API routines that are - * used in the normal full-decompression case. They are not used by a - * transcoding-only application. Note that if an application links in - * jpeg_start_decompress, it will end up linking in the entire decompressor. - * We thus must separate this file from jdapimin.c to avoid linking the - * whole decompression library into a transcoder. - */ - -#define JPEG_INTERNALS -#include "jinclude.h" -#include "jpeglib.h" - - -/* Forward declarations */ -LOCAL(boolean) output_pass_setup JPP((j_decompress_ptr cinfo)); - - -/* - * Decompression initialization. - * jpeg_read_header must be completed before calling this. - * - * If a multipass operating mode was selected, this will do all but the - * last pass, and thus may take a great deal of time. - * - * Returns FALSE if suspended. The return value need be inspected only if - * a suspending data source is used. - */ - -GLOBAL(boolean) -jpeg_start_decompress (j_decompress_ptr cinfo) -{ - if (cinfo->global_state == DSTATE_READY) { - /* First call: initialize master control, select active modules */ - jinit_master_decompress(cinfo); - if (cinfo->buffered_image) { - /* No more work here; expecting jpeg_start_output next */ - cinfo->global_state = DSTATE_BUFIMAGE; - return TRUE; - } - cinfo->global_state = DSTATE_PRELOAD; - } - if (cinfo->global_state == DSTATE_PRELOAD) { - /* If file has multiple scans, absorb them all into the coef buffer */ - if (cinfo->inputctl->has_multiple_scans) { -#ifdef D_MULTISCAN_FILES_SUPPORTED - for (;;) { - int retcode; - /* Call progress monitor hook if present */ - if (cinfo->progress != NULL) - (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo); - /* Absorb some more input */ - retcode = (*cinfo->inputctl->consume_input) (cinfo); - if (retcode == JPEG_SUSPENDED) - return FALSE; - if (retcode == JPEG_REACHED_EOI) - break; - /* Advance progress counter if appropriate */ - if (cinfo->progress != NULL && - (retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) { - if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) { - /* jdmaster underestimated number of scans; ratchet up one scan */ - cinfo->progress->pass_limit += (long) cinfo->total_iMCU_rows; - } - } - } -#else - ERREXIT(cinfo, JERR_NOT_COMPILED); -#endif /* D_MULTISCAN_FILES_SUPPORTED */ - } - cinfo->output_scan_number = cinfo->input_scan_number; - } else if (cinfo->global_state != DSTATE_PRESCAN) - ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); - /* Perform any dummy output passes, and set up for the final pass */ - return output_pass_setup(cinfo); -} - -/* - * Tile decompression initialization. - * jpeg_read_header must be completed before calling this. - */ - -GLOBAL(boolean) -jpeg_start_tile_decompress (j_decompress_ptr cinfo) -{ - if (cinfo->global_state == DSTATE_READY) { - /* First call: initialize master control, select active modules */ - cinfo->tile_decode = TRUE; - 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) { - cinfo->output_scan_number = cinfo->input_scan_number; - } else if (cinfo->global_state != DSTATE_PRESCAN) - ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); - /* Perform any dummy output passes, and set up for the final pass */ - return output_pass_setup(cinfo); -} - - -/* - * Set up for an output pass, and perform any dummy pass(es) needed. - * Common subroutine for jpeg_start_decompress and jpeg_start_output. - * Entry: global_state = DSTATE_PRESCAN only if previously suspended. - * Exit: If done, returns TRUE and sets global_state for proper output mode. - * If suspended, returns FALSE and sets global_state = DSTATE_PRESCAN. - */ - -LOCAL(boolean) -output_pass_setup (j_decompress_ptr cinfo) -{ - if (cinfo->global_state != DSTATE_PRESCAN) { - /* First call: do pass setup */ - (*cinfo->master->prepare_for_output_pass) (cinfo); - cinfo->output_scanline = 0; - cinfo->global_state = DSTATE_PRESCAN; - } - /* Loop over any required dummy passes */ - while (cinfo->master->is_dummy_pass) { -#ifdef QUANT_2PASS_SUPPORTED - /* Crank through the dummy pass */ - while (cinfo->output_scanline < cinfo->output_height) { - JDIMENSION last_scanline; - /* Call progress monitor hook if present */ - 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); - } - /* Process some data */ - 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; /* No progress made, must suspend */ - } - /* Finish up dummy pass, and set up for another one */ - (*cinfo->master->finish_output_pass) (cinfo); - (*cinfo->master->prepare_for_output_pass) (cinfo); - cinfo->output_scanline = 0; -#else - ERREXIT(cinfo, JERR_NOT_COMPILED); -#endif /* QUANT_2PASS_SUPPORTED */ - } - /* Ready for application to drive output pass through - * jpeg_read_scanlines or jpeg_read_raw_data. - */ - cinfo->global_state = cinfo->raw_data_out ? DSTATE_RAW_OK : DSTATE_SCANNING; - return TRUE; -} - - -/* - * Read some scanlines of data from the JPEG decompressor. - * - * The return value will be the number of lines actually read. - * This may be less than the number requested in several cases, - * including bottom of image, data source suspension, and operating - * modes that emit multiple scanlines at a time. - * - * Note: we warn about excess calls to jpeg_read_scanlines() since - * this likely signals an application programmer error. However, - * an oversize buffer (max_lines > scanlines remaining) is not an error. - */ - -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; - } - - /* Call progress monitor hook if present */ - 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); - } - - /* Process some data */ - row_ctr = 0; - (*cinfo->main->process_data) (cinfo, scanlines, &row_ctr, max_lines); - cinfo->output_scanline += row_ctr; - return row_ctr; -} -/* - * Initialize the jpeg decoder to decompressing a rectangle with size of (width, height) - * and its upper-left corner located at (start_x, start_y). - * Align start_x and start_y to multiplies of iMCU width and height, respectively. - * Also, the new reader position and sampled image size will be returned in - * (start_x, start_y) and (width, height), respectively. - */ - -GLOBAL(void) -jpeg_init_read_tile_scanline(j_decompress_ptr cinfo, huffman_index *index, - int *start_x, int *start_y, int *width, int *height) -{ - // Calculates the boundary of iMCU - int lines_per_iMCU_row = cinfo->max_v_samp_factor * DCTSIZE; - int lines_per_iMCU_col = cinfo->max_h_samp_factor * DCTSIZE; - int row_offset = *start_y / lines_per_iMCU_row; - int col_left_boundary = ((*start_x / lines_per_iMCU_col) - / index->MCU_sample_size) * index->MCU_sample_size; - int col_right_boundary = - jdiv_round_up(*start_x + *width, lines_per_iMCU_col); - - cinfo->coef->MCU_columns_to_skip = - *start_x / lines_per_iMCU_col - col_left_boundary; - - *height = (*start_y - row_offset * lines_per_iMCU_row) + *height; - *start_x = col_left_boundary * lines_per_iMCU_col; - *start_y = row_offset * lines_per_iMCU_row; - cinfo->image_width = jmin(cinfo->original_image_width, - col_right_boundary * lines_per_iMCU_col) - - col_left_boundary * lines_per_iMCU_col; - cinfo->input_iMCU_row = row_offset; - cinfo->output_iMCU_row = row_offset; - - // Updates JPEG decoder parameter - jinit_color_deconverter(cinfo); - jpeg_calc_output_dimensions(cinfo); - jinit_upsampler(cinfo); - (*cinfo->master->prepare_for_output_pass) (cinfo); - if (cinfo->progressive_mode) - (*cinfo->entropy->start_pass) (cinfo); - else - jpeg_decompress_per_scan_setup(cinfo); - - int sample_size = DCTSIZE / cinfo->min_DCT_scaled_size; - - *height = jdiv_round_up(*height, sample_size); - *width = cinfo->output_width; - cinfo->output_scanline = lines_per_iMCU_row * row_offset / sample_size; - cinfo->inputctl->consume_input = cinfo->coef->consume_data; - cinfo->inputctl->consume_input_build_huffman_index = - cinfo->coef->consume_data_build_huffman_index; - cinfo->entropy->index = index; - cinfo->input_iMCU_row = row_offset; - cinfo->output_iMCU_row = row_offset; - cinfo->coef->MCU_column_left_boundary = col_left_boundary; - cinfo->coef->MCU_column_right_boundary = col_right_boundary; - cinfo->coef->column_left_boundary = - col_left_boundary / index->MCU_sample_size; - cinfo->coef->column_right_boundary = - jdiv_round_up(col_right_boundary, index->MCU_sample_size); -} - -/* - * Read a scanline from the current position. - * - * Return the number of lines actually read. - */ - -GLOBAL(JDIMENSION) -jpeg_read_tile_scanline (j_decompress_ptr cinfo, huffman_index *index, - JSAMPARRAY scanlines) -{ - // Calculates the boundary of iMCU - int lines_per_iMCU_row = cinfo->max_v_samp_factor * DCTSIZE; - int lines_per_iMCU_col = cinfo->max_h_samp_factor * DCTSIZE; - int sample_size = DCTSIZE / cinfo->min_DCT_scaled_size; - JDIMENSION row_ctr = 0; - - if (cinfo->progressive_mode) { - (*cinfo->main->process_data) (cinfo, scanlines, &row_ctr, 1); - } else { - if (cinfo->output_scanline % (lines_per_iMCU_row / sample_size) == 0) { - // Set the read head to the next iMCU row - int iMCU_row_offset = cinfo->output_scanline / - (lines_per_iMCU_row / sample_size); - int offset_data_col_position = cinfo->coef->MCU_column_left_boundary / - index->MCU_sample_size; - huffman_offset_data offset_data = - index->scan[0].offset[iMCU_row_offset][offset_data_col_position]; - (*cinfo->entropy->configure_huffman_decoder) (cinfo, offset_data); - } - (*cinfo->main->process_data) (cinfo, scanlines, &row_ctr, 1); - } - - cinfo->output_scanline += row_ctr; - return row_ctr; -} - -/* - * Alternate entry point to read raw data. - * Processes exactly one iMCU row per call, unless suspended. - */ - -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; - } - - /* Call progress monitor hook if present */ - 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); - } - - /* Verify that at least one iMCU row can be returned. */ - 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); - - /* Decompress directly into user's buffer. */ - if (! (*cinfo->coef->decompress_data) (cinfo, data)) - return 0; /* suspension forced, can do nothing more */ - - /* OK, we processed one iMCU row. */ - cinfo->output_scanline += lines_per_iMCU_row; - return lines_per_iMCU_row; -} - - -/* Additional entry points for buffered-image mode. */ - -#ifdef D_MULTISCAN_FILES_SUPPORTED - -/* - * Initialize for an output pass in buffered-image mode. - */ - -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); - /* Limit scan number to valid range */ - 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; - /* Perform any dummy output passes, and set up for the real pass */ - return output_pass_setup(cinfo); -} - - -/* - * Finish up after an output pass in buffered-image mode. - * - * Returns FALSE if suspended. The return value need be inspected only if - * a suspending data source is used. - */ - -GLOBAL(boolean) -jpeg_finish_output (j_decompress_ptr cinfo) -{ - if ((cinfo->global_state == DSTATE_SCANNING || - cinfo->global_state == DSTATE_RAW_OK) && cinfo->buffered_image) { - /* Terminate this pass. */ - /* We do not require the whole pass to have been completed. */ - (*cinfo->master->finish_output_pass) (cinfo); - cinfo->global_state = DSTATE_BUFPOST; - } else if (cinfo->global_state != DSTATE_BUFPOST) { - /* BUFPOST = repeat call after a suspension, anything else is error */ - ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); - } - /* Read markers looking for SOS or EOI */ - while (cinfo->input_scan_number <= cinfo->output_scan_number && - ! cinfo->inputctl->eoi_reached) { - if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED) - return FALSE; /* Suspend, come back later */ - } - cinfo->global_state = DSTATE_BUFIMAGE; - return TRUE; -} - -#endif /* D_MULTISCAN_FILES_SUPPORTED */ |