1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libjpeg/jcapimin.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,292 @@
1.4 +/*
1.5 + * jcapimin.c
1.6 + *
1.7 + * Copyright (C) 1994-1998, Thomas G. Lane.
1.8 + * Modified 2003-2010 by Guido Vollbeding.
1.9 + * This file is part of the Independent JPEG Group's software.
1.10 + * For conditions of distribution and use, see the accompanying README file.
1.11 + *
1.12 + * This file contains application interface code for the compression half
1.13 + * of the JPEG library. These are the "minimum" API routines that may be
1.14 + * needed in either the normal full-compression case or the transcoding-only
1.15 + * case.
1.16 + *
1.17 + * Most of the routines intended to be called directly by an application
1.18 + * are in this file or in jcapistd.c. But also see jcparam.c for
1.19 + * parameter-setup helper routines, jcomapi.c for routines shared by
1.20 + * compression and decompression, and jctrans.c for the transcoding case.
1.21 + */
1.22 +
1.23 +#define JPEG_INTERNALS
1.24 +#include "jinclude.h"
1.25 +#include "jpeglib.h"
1.26 +
1.27 +
1.28 +/*
1.29 + * Initialization of a JPEG compression object.
1.30 + * The error manager must already be set up (in case memory manager fails).
1.31 + */
1.32 +
1.33 +GLOBAL(void)
1.34 +jpeg_CreateCompress (j_compress_ptr cinfo, int version, size_t structsize)
1.35 +{
1.36 + int i;
1.37 +
1.38 + /* Guard against version mismatches between library and caller. */
1.39 + cinfo->mem = NULL; /* so jpeg_destroy knows mem mgr not called */
1.40 + if (version != JPEG_LIB_VERSION)
1.41 + ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version);
1.42 + if (structsize != SIZEOF(struct jpeg_compress_struct))
1.43 + ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE,
1.44 + (int) SIZEOF(struct jpeg_compress_struct), (int) structsize);
1.45 +
1.46 + /* For debugging purposes, we zero the whole master structure.
1.47 + * But the application has already set the err pointer, and may have set
1.48 + * client_data, so we have to save and restore those fields.
1.49 + * Note: if application hasn't set client_data, tools like Purify may
1.50 + * complain here.
1.51 + */
1.52 + {
1.53 + struct jpeg_error_mgr * err = cinfo->err;
1.54 + void * client_data = cinfo->client_data; /* ignore Purify complaint here */
1.55 + MEMZERO(cinfo, SIZEOF(struct jpeg_compress_struct));
1.56 + cinfo->err = err;
1.57 + cinfo->client_data = client_data;
1.58 + }
1.59 + cinfo->is_decompressor = FALSE;
1.60 +
1.61 + /* Initialize a memory manager instance for this object */
1.62 + jinit_memory_mgr((j_common_ptr) cinfo);
1.63 +
1.64 + /* Zero out pointers to permanent structures. */
1.65 + cinfo->progress = NULL;
1.66 + cinfo->dest = NULL;
1.67 +
1.68 + cinfo->comp_info = NULL;
1.69 +
1.70 + for (i = 0; i < NUM_QUANT_TBLS; i++) {
1.71 + cinfo->quant_tbl_ptrs[i] = NULL;
1.72 +#if JPEG_LIB_VERSION >= 70
1.73 + cinfo->q_scale_factor[i] = 100;
1.74 +#endif
1.75 + }
1.76 +
1.77 + for (i = 0; i < NUM_HUFF_TBLS; i++) {
1.78 + cinfo->dc_huff_tbl_ptrs[i] = NULL;
1.79 + cinfo->ac_huff_tbl_ptrs[i] = NULL;
1.80 + }
1.81 +
1.82 +#if JPEG_LIB_VERSION >= 80
1.83 + /* Must do it here for emit_dqt in case jpeg_write_tables is used */
1.84 + cinfo->block_size = DCTSIZE;
1.85 + cinfo->natural_order = jpeg_natural_order;
1.86 + cinfo->lim_Se = DCTSIZE2-1;
1.87 +#endif
1.88 +
1.89 + cinfo->script_space = NULL;
1.90 +
1.91 + cinfo->input_gamma = 1.0; /* in case application forgets */
1.92 +
1.93 + /* OK, I'm ready */
1.94 + cinfo->global_state = CSTATE_START;
1.95 +}
1.96 +
1.97 +
1.98 +/*
1.99 + * Destruction of a JPEG compression object
1.100 + */
1.101 +
1.102 +GLOBAL(void)
1.103 +jpeg_destroy_compress (j_compress_ptr cinfo)
1.104 +{
1.105 + jpeg_destroy((j_common_ptr) cinfo); /* use common routine */
1.106 +}
1.107 +
1.108 +
1.109 +/*
1.110 + * Abort processing of a JPEG compression operation,
1.111 + * but don't destroy the object itself.
1.112 + */
1.113 +
1.114 +GLOBAL(void)
1.115 +jpeg_abort_compress (j_compress_ptr cinfo)
1.116 +{
1.117 + jpeg_abort((j_common_ptr) cinfo); /* use common routine */
1.118 +}
1.119 +
1.120 +
1.121 +/*
1.122 + * Forcibly suppress or un-suppress all quantization and Huffman tables.
1.123 + * Marks all currently defined tables as already written (if suppress)
1.124 + * or not written (if !suppress). This will control whether they get emitted
1.125 + * by a subsequent jpeg_start_compress call.
1.126 + *
1.127 + * This routine is exported for use by applications that want to produce
1.128 + * abbreviated JPEG datastreams. It logically belongs in jcparam.c, but
1.129 + * since it is called by jpeg_start_compress, we put it here --- otherwise
1.130 + * jcparam.o would be linked whether the application used it or not.
1.131 + */
1.132 +
1.133 +GLOBAL(void)
1.134 +jpeg_suppress_tables (j_compress_ptr cinfo, boolean suppress)
1.135 +{
1.136 + int i;
1.137 + JQUANT_TBL * qtbl;
1.138 + JHUFF_TBL * htbl;
1.139 +
1.140 + for (i = 0; i < NUM_QUANT_TBLS; i++) {
1.141 + if ((qtbl = cinfo->quant_tbl_ptrs[i]) != NULL)
1.142 + qtbl->sent_table = suppress;
1.143 + }
1.144 +
1.145 + for (i = 0; i < NUM_HUFF_TBLS; i++) {
1.146 + if ((htbl = cinfo->dc_huff_tbl_ptrs[i]) != NULL)
1.147 + htbl->sent_table = suppress;
1.148 + if ((htbl = cinfo->ac_huff_tbl_ptrs[i]) != NULL)
1.149 + htbl->sent_table = suppress;
1.150 + }
1.151 +}
1.152 +
1.153 +
1.154 +/*
1.155 + * Finish JPEG compression.
1.156 + *
1.157 + * If a multipass operating mode was selected, this may do a great deal of
1.158 + * work including most of the actual output.
1.159 + */
1.160 +
1.161 +GLOBAL(void)
1.162 +jpeg_finish_compress (j_compress_ptr cinfo)
1.163 +{
1.164 + JDIMENSION iMCU_row;
1.165 +
1.166 + if (cinfo->global_state == CSTATE_SCANNING ||
1.167 + cinfo->global_state == CSTATE_RAW_OK) {
1.168 + /* Terminate first pass */
1.169 + if (cinfo->next_scanline < cinfo->image_height)
1.170 + ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
1.171 + (*cinfo->master->finish_pass) (cinfo);
1.172 + } else if (cinfo->global_state != CSTATE_WRCOEFS)
1.173 + ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
1.174 + /* Perform any remaining passes */
1.175 + while (! cinfo->master->is_last_pass) {
1.176 + (*cinfo->master->prepare_for_pass) (cinfo);
1.177 + for (iMCU_row = 0; iMCU_row < cinfo->total_iMCU_rows; iMCU_row++) {
1.178 + if (cinfo->progress != NULL) {
1.179 + cinfo->progress->pass_counter = (long) iMCU_row;
1.180 + cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows;
1.181 + (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
1.182 + }
1.183 + /* We bypass the main controller and invoke coef controller directly;
1.184 + * all work is being done from the coefficient buffer.
1.185 + */
1.186 + if (! (*cinfo->coef->compress_data) (cinfo, (JSAMPIMAGE) NULL))
1.187 + ERREXIT(cinfo, JERR_CANT_SUSPEND);
1.188 + }
1.189 + (*cinfo->master->finish_pass) (cinfo);
1.190 + }
1.191 + /* Write EOI, do final cleanup */
1.192 + (*cinfo->marker->write_file_trailer) (cinfo);
1.193 + (*cinfo->dest->term_destination) (cinfo);
1.194 + /* We can use jpeg_abort to release memory and reset global_state */
1.195 + jpeg_abort((j_common_ptr) cinfo);
1.196 +}
1.197 +
1.198 +
1.199 +/*
1.200 + * Write a special marker.
1.201 + * This is only recommended for writing COM or APPn markers.
1.202 + * Must be called after jpeg_start_compress() and before
1.203 + * first call to jpeg_write_scanlines() or jpeg_write_raw_data().
1.204 + */
1.205 +
1.206 +GLOBAL(void)
1.207 +jpeg_write_marker (j_compress_ptr cinfo, int marker,
1.208 + const JOCTET *dataptr, unsigned int datalen)
1.209 +{
1.210 + JMETHOD(void, write_marker_byte, (j_compress_ptr info, int val));
1.211 +
1.212 + if (cinfo->next_scanline != 0 ||
1.213 + (cinfo->global_state != CSTATE_SCANNING &&
1.214 + cinfo->global_state != CSTATE_RAW_OK &&
1.215 + cinfo->global_state != CSTATE_WRCOEFS))
1.216 + ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
1.217 +
1.218 + (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
1.219 + write_marker_byte = cinfo->marker->write_marker_byte; /* copy for speed */
1.220 + while (datalen--) {
1.221 + (*write_marker_byte) (cinfo, *dataptr);
1.222 + dataptr++;
1.223 + }
1.224 +}
1.225 +
1.226 +/* Same, but piecemeal. */
1.227 +
1.228 +GLOBAL(void)
1.229 +jpeg_write_m_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
1.230 +{
1.231 + if (cinfo->next_scanline != 0 ||
1.232 + (cinfo->global_state != CSTATE_SCANNING &&
1.233 + cinfo->global_state != CSTATE_RAW_OK &&
1.234 + cinfo->global_state != CSTATE_WRCOEFS))
1.235 + ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
1.236 +
1.237 + (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
1.238 +}
1.239 +
1.240 +GLOBAL(void)
1.241 +jpeg_write_m_byte (j_compress_ptr cinfo, int val)
1.242 +{
1.243 + (*cinfo->marker->write_marker_byte) (cinfo, val);
1.244 +}
1.245 +
1.246 +
1.247 +/*
1.248 + * Alternate compression function: just write an abbreviated table file.
1.249 + * Before calling this, all parameters and a data destination must be set up.
1.250 + *
1.251 + * To produce a pair of files containing abbreviated tables and abbreviated
1.252 + * image data, one would proceed as follows:
1.253 + *
1.254 + * initialize JPEG object
1.255 + * set JPEG parameters
1.256 + * set destination to table file
1.257 + * jpeg_write_tables(cinfo);
1.258 + * set destination to image file
1.259 + * jpeg_start_compress(cinfo, FALSE);
1.260 + * write data...
1.261 + * jpeg_finish_compress(cinfo);
1.262 + *
1.263 + * jpeg_write_tables has the side effect of marking all tables written
1.264 + * (same as jpeg_suppress_tables(..., TRUE)). Thus a subsequent start_compress
1.265 + * will not re-emit the tables unless it is passed write_all_tables=TRUE.
1.266 + */
1.267 +
1.268 +GLOBAL(void)
1.269 +jpeg_write_tables (j_compress_ptr cinfo)
1.270 +{
1.271 + if (cinfo->global_state != CSTATE_START)
1.272 + ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
1.273 +
1.274 + /* (Re)initialize error mgr and destination modules */
1.275 + (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
1.276 + (*cinfo->dest->init_destination) (cinfo);
1.277 + /* Initialize the marker writer ... bit of a crock to do it here. */
1.278 + jinit_marker_writer(cinfo);
1.279 + /* Write them tables! */
1.280 + (*cinfo->marker->write_tables_only) (cinfo);
1.281 + /* And clean up. */
1.282 + (*cinfo->dest->term_destination) (cinfo);
1.283 + /*
1.284 + * In library releases up through v6a, we called jpeg_abort() here to free
1.285 + * any working memory allocated by the destination manager and marker
1.286 + * writer. Some applications had a problem with that: they allocated space
1.287 + * of their own from the library memory manager, and didn't want it to go
1.288 + * away during write_tables. So now we do nothing. This will cause a
1.289 + * memory leak if an app calls write_tables repeatedly without doing a full
1.290 + * compression cycle or otherwise resetting the JPEG object. However, that
1.291 + * seems less bad than unexpectedly freeing memory in the normal case.
1.292 + * An app that prefers the old behavior can call jpeg_abort for itself after
1.293 + * each call to jpeg_write_tables().
1.294 + */
1.295 +}
