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annotate libs/libjpeg/jcapistd.c @ 16:c6952cc82cca

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asset manager, android version
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 09 Jun 2015 18:38:33 +0300
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nuclear@14 1 /*
nuclear@14 2 * jcapistd.c
nuclear@14 3 *
nuclear@14 4 * Copyright (C) 1994-1996, Thomas G. Lane.
nuclear@14 5 * This file is part of the Independent JPEG Group's software.
nuclear@14 6 * For conditions of distribution and use, see the accompanying README file.
nuclear@14 7 *
nuclear@14 8 * This file contains application interface code for the compression half
nuclear@14 9 * of the JPEG library. These are the "standard" API routines that are
nuclear@14 10 * used in the normal full-compression case. They are not used by a
nuclear@14 11 * transcoding-only application. Note that if an application links in
nuclear@14 12 * jpeg_start_compress, it will end up linking in the entire compressor.
nuclear@14 13 * We thus must separate this file from jcapimin.c to avoid linking the
nuclear@14 14 * whole compression library into a transcoder.
nuclear@14 15 */
nuclear@14 16
nuclear@14 17 #define JPEG_INTERNALS
nuclear@14 18 #include "jinclude.h"
nuclear@14 19 #include "jpeglib.h"
nuclear@14 20
nuclear@14 21
nuclear@14 22 /*
nuclear@14 23 * Compression initialization.
nuclear@14 24 * Before calling this, all parameters and a data destination must be set up.
nuclear@14 25 *
nuclear@14 26 * We require a write_all_tables parameter as a failsafe check when writing
nuclear@14 27 * multiple datastreams from the same compression object. Since prior runs
nuclear@14 28 * will have left all the tables marked sent_table=TRUE, a subsequent run
nuclear@14 29 * would emit an abbreviated stream (no tables) by default. This may be what
nuclear@14 30 * is wanted, but for safety's sake it should not be the default behavior:
nuclear@14 31 * programmers should have to make a deliberate choice to emit abbreviated
nuclear@14 32 * images. Therefore the documentation and examples should encourage people
nuclear@14 33 * to pass write_all_tables=TRUE; then it will take active thought to do the
nuclear@14 34 * wrong thing.
nuclear@14 35 */
nuclear@14 36
nuclear@14 37 GLOBAL(void)
nuclear@14 38 jpeg_start_compress (j_compress_ptr cinfo, boolean write_all_tables)
nuclear@14 39 {
nuclear@14 40 if (cinfo->global_state != CSTATE_START)
nuclear@14 41 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
nuclear@14 42
nuclear@14 43 if (write_all_tables)
nuclear@14 44 jpeg_suppress_tables(cinfo, FALSE); /* mark all tables to be written */
nuclear@14 45
nuclear@14 46 /* (Re)initialize error mgr and destination modules */
nuclear@14 47 (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
nuclear@14 48 (*cinfo->dest->init_destination) (cinfo);
nuclear@14 49 /* Perform master selection of active modules */
nuclear@14 50 jinit_compress_master(cinfo);
nuclear@14 51 /* Set up for the first pass */
nuclear@14 52 (*cinfo->master->prepare_for_pass) (cinfo);
nuclear@14 53 /* Ready for application to drive first pass through jpeg_write_scanlines
nuclear@14 54 * or jpeg_write_raw_data.
nuclear@14 55 */
nuclear@14 56 cinfo->next_scanline = 0;
nuclear@14 57 cinfo->global_state = (cinfo->raw_data_in ? CSTATE_RAW_OK : CSTATE_SCANNING);
nuclear@14 58 }
nuclear@14 59
nuclear@14 60
nuclear@14 61 /*
nuclear@14 62 * Write some scanlines of data to the JPEG compressor.
nuclear@14 63 *
nuclear@14 64 * The return value will be the number of lines actually written.
nuclear@14 65 * This should be less than the supplied num_lines only in case that
nuclear@14 66 * the data destination module has requested suspension of the compressor,
nuclear@14 67 * or if more than image_height scanlines are passed in.
nuclear@14 68 *
nuclear@14 69 * Note: we warn about excess calls to jpeg_write_scanlines() since
nuclear@14 70 * this likely signals an application programmer error. However,
nuclear@14 71 * excess scanlines passed in the last valid call are *silently* ignored,
nuclear@14 72 * so that the application need not adjust num_lines for end-of-image
nuclear@14 73 * when using a multiple-scanline buffer.
nuclear@14 74 */
nuclear@14 75
nuclear@14 76 GLOBAL(JDIMENSION)
nuclear@14 77 jpeg_write_scanlines (j_compress_ptr cinfo, JSAMPARRAY scanlines,
nuclear@14 78 JDIMENSION num_lines)
nuclear@14 79 {
nuclear@14 80 JDIMENSION row_ctr, rows_left;
nuclear@14 81
nuclear@14 82 if (cinfo->global_state != CSTATE_SCANNING)
nuclear@14 83 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
nuclear@14 84 if (cinfo->next_scanline >= cinfo->image_height)
nuclear@14 85 WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
nuclear@14 86
nuclear@14 87 /* Call progress monitor hook if present */
nuclear@14 88 if (cinfo->progress != NULL) {
nuclear@14 89 cinfo->progress->pass_counter = (long) cinfo->next_scanline;
nuclear@14 90 cinfo->progress->pass_limit = (long) cinfo->image_height;
nuclear@14 91 (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
nuclear@14 92 }
nuclear@14 93
nuclear@14 94 /* Give master control module another chance if this is first call to
nuclear@14 95 * jpeg_write_scanlines. This lets output of the frame/scan headers be
nuclear@14 96 * delayed so that application can write COM, etc, markers between
nuclear@14 97 * jpeg_start_compress and jpeg_write_scanlines.
nuclear@14 98 */
nuclear@14 99 if (cinfo->master->call_pass_startup)
nuclear@14 100 (*cinfo->master->pass_startup) (cinfo);
nuclear@14 101
nuclear@14 102 /* Ignore any extra scanlines at bottom of image. */
nuclear@14 103 rows_left = cinfo->image_height - cinfo->next_scanline;
nuclear@14 104 if (num_lines > rows_left)
nuclear@14 105 num_lines = rows_left;
nuclear@14 106
nuclear@14 107 row_ctr = 0;
nuclear@14 108 (*cinfo->main->process_data) (cinfo, scanlines, &row_ctr, num_lines);
nuclear@14 109 cinfo->next_scanline += row_ctr;
nuclear@14 110 return row_ctr;
nuclear@14 111 }
nuclear@14 112
nuclear@14 113
nuclear@14 114 /*
nuclear@14 115 * Alternate entry point to write raw data.
nuclear@14 116 * Processes exactly one iMCU row per call, unless suspended.
nuclear@14 117 */
nuclear@14 118
nuclear@14 119 GLOBAL(JDIMENSION)
nuclear@14 120 jpeg_write_raw_data (j_compress_ptr cinfo, JSAMPIMAGE data,
nuclear@14 121 JDIMENSION num_lines)
nuclear@14 122 {
nuclear@14 123 JDIMENSION lines_per_iMCU_row;
nuclear@14 124
nuclear@14 125 if (cinfo->global_state != CSTATE_RAW_OK)
nuclear@14 126 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
nuclear@14 127 if (cinfo->next_scanline >= cinfo->image_height) {
nuclear@14 128 WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
nuclear@14 129 return 0;
nuclear@14 130 }
nuclear@14 131
nuclear@14 132 /* Call progress monitor hook if present */
nuclear@14 133 if (cinfo->progress != NULL) {
nuclear@14 134 cinfo->progress->pass_counter = (long) cinfo->next_scanline;
nuclear@14 135 cinfo->progress->pass_limit = (long) cinfo->image_height;
nuclear@14 136 (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
nuclear@14 137 }
nuclear@14 138
nuclear@14 139 /* Give master control module another chance if this is first call to
nuclear@14 140 * jpeg_write_raw_data. This lets output of the frame/scan headers be
nuclear@14 141 * delayed so that application can write COM, etc, markers between
nuclear@14 142 * jpeg_start_compress and jpeg_write_raw_data.
nuclear@14 143 */
nuclear@14 144 if (cinfo->master->call_pass_startup)
nuclear@14 145 (*cinfo->master->pass_startup) (cinfo);
nuclear@14 146
nuclear@14 147 /* Verify that at least one iMCU row has been passed. */
nuclear@14 148 lines_per_iMCU_row = cinfo->max_v_samp_factor * DCTSIZE;
nuclear@14 149 if (num_lines < lines_per_iMCU_row)
nuclear@14 150 ERREXIT(cinfo, JERR_BUFFER_SIZE);
nuclear@14 151
nuclear@14 152 /* Directly compress the row. */
nuclear@14 153 if (! (*cinfo->coef->compress_data) (cinfo, data)) {
nuclear@14 154 /* If compressor did not consume the whole row, suspend processing. */
nuclear@14 155 return 0;
nuclear@14 156 }
nuclear@14 157
nuclear@14 158 /* OK, we processed one iMCU row. */
nuclear@14 159 cinfo->next_scanline += lines_per_iMCU_row;
nuclear@14 160 return lines_per_iMCU_row;
nuclear@14 161 }