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Diffstat (limited to '')
| -rw-r--r-- | libjpegtwrp/jdapistd.c | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/libjpegtwrp/jdapistd.c b/libjpegtwrp/jdapistd.c new file mode 100644 index 000000000..e1233df36 --- /dev/null +++ b/libjpegtwrp/jdapistd.c @@ -0,0 +1,397 @@ +/* + * 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 */ |