mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-31 22:25:30 +00:00
293 lines
9.2 KiB
C
293 lines
9.2 KiB
C
/*
|
|
* jcapimin.c
|
|
*
|
|
* Copyright (C) 1994-1998, Thomas G. Lane.
|
|
* Modified 2003-2010 by Guido Vollbeding.
|
|
* 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 compression half
|
|
* of the JPEG library. These are the "minimum" API routines that may be
|
|
* needed in either the normal full-compression case or the transcoding-only
|
|
* case.
|
|
*
|
|
* Most of the routines intended to be called directly by an application
|
|
* are in this file or in jcapistd.c. But also see jcparam.c for
|
|
* parameter-setup helper routines, jcomapi.c for routines shared by
|
|
* compression and decompression, and jctrans.c for the transcoding case.
|
|
*/
|
|
|
|
#define JPEG_INTERNALS
|
|
#include "jinclude.h"
|
|
#include "jpeglib.h"
|
|
|
|
|
|
/*
|
|
* Initialization of a JPEG compression object.
|
|
* The error manager must already be set up (in case memory manager fails).
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jpeg_CreateCompress (j_compress_ptr cinfo, int version, size_t structsize)
|
|
{
|
|
int i;
|
|
|
|
/* Guard against version mismatches between library and caller. */
|
|
cinfo->mem = NULL; /* so jpeg_destroy knows mem mgr not called */
|
|
if (version != JPEG_LIB_VERSION)
|
|
ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version);
|
|
if (structsize != SIZEOF(struct jpeg_compress_struct))
|
|
ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE,
|
|
(int) SIZEOF(struct jpeg_compress_struct), (int) structsize);
|
|
|
|
/* For debugging purposes, we zero the whole master structure.
|
|
* But the application has already set the err pointer, and may have set
|
|
* client_data, so we have to save and restore those fields.
|
|
* Note: if application hasn't set client_data, tools like Purify may
|
|
* complain here.
|
|
*/
|
|
{
|
|
struct jpeg_error_mgr * err = cinfo->err;
|
|
void * client_data = cinfo->client_data; /* ignore Purify complaint here */
|
|
MEMZERO(cinfo, SIZEOF(struct jpeg_compress_struct));
|
|
cinfo->err = err;
|
|
cinfo->client_data = client_data;
|
|
}
|
|
cinfo->is_decompressor = FALSE;
|
|
|
|
/* Initialize a memory manager instance for this object */
|
|
jinit_memory_mgr((j_common_ptr) cinfo);
|
|
|
|
/* Zero out pointers to permanent structures. */
|
|
cinfo->progress = NULL;
|
|
cinfo->dest = NULL;
|
|
|
|
cinfo->comp_info = NULL;
|
|
|
|
for (i = 0; i < NUM_QUANT_TBLS; i++) {
|
|
cinfo->quant_tbl_ptrs[i] = NULL;
|
|
#if JPEG_LIB_VERSION >= 70
|
|
cinfo->q_scale_factor[i] = 100;
|
|
#endif
|
|
}
|
|
|
|
for (i = 0; i < NUM_HUFF_TBLS; i++) {
|
|
cinfo->dc_huff_tbl_ptrs[i] = NULL;
|
|
cinfo->ac_huff_tbl_ptrs[i] = NULL;
|
|
}
|
|
|
|
#if JPEG_LIB_VERSION >= 80
|
|
/* Must do it here for emit_dqt in case jpeg_write_tables is used */
|
|
cinfo->block_size = DCTSIZE;
|
|
cinfo->natural_order = jpeg_natural_order;
|
|
cinfo->lim_Se = DCTSIZE2-1;
|
|
#endif
|
|
|
|
cinfo->script_space = NULL;
|
|
|
|
cinfo->input_gamma = 1.0; /* in case application forgets */
|
|
|
|
/* OK, I'm ready */
|
|
cinfo->global_state = CSTATE_START;
|
|
}
|
|
|
|
|
|
/*
|
|
* Destruction of a JPEG compression object
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jpeg_destroy_compress (j_compress_ptr cinfo)
|
|
{
|
|
jpeg_destroy((j_common_ptr) cinfo); /* use common routine */
|
|
}
|
|
|
|
|
|
/*
|
|
* Abort processing of a JPEG compression operation,
|
|
* but don't destroy the object itself.
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jpeg_abort_compress (j_compress_ptr cinfo)
|
|
{
|
|
jpeg_abort((j_common_ptr) cinfo); /* use common routine */
|
|
}
|
|
|
|
|
|
/*
|
|
* Forcibly suppress or un-suppress all quantization and Huffman tables.
|
|
* Marks all currently defined tables as already written (if suppress)
|
|
* or not written (if !suppress). This will control whether they get emitted
|
|
* by a subsequent jpeg_start_compress call.
|
|
*
|
|
* This routine is exported for use by applications that want to produce
|
|
* abbreviated JPEG datastreams. It logically belongs in jcparam.c, but
|
|
* since it is called by jpeg_start_compress, we put it here --- otherwise
|
|
* jcparam.o would be linked whether the application used it or not.
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jpeg_suppress_tables (j_compress_ptr cinfo, boolean suppress)
|
|
{
|
|
int i;
|
|
JQUANT_TBL * qtbl;
|
|
JHUFF_TBL * htbl;
|
|
|
|
for (i = 0; i < NUM_QUANT_TBLS; i++) {
|
|
if ((qtbl = cinfo->quant_tbl_ptrs[i]) != NULL)
|
|
qtbl->sent_table = suppress;
|
|
}
|
|
|
|
for (i = 0; i < NUM_HUFF_TBLS; i++) {
|
|
if ((htbl = cinfo->dc_huff_tbl_ptrs[i]) != NULL)
|
|
htbl->sent_table = suppress;
|
|
if ((htbl = cinfo->ac_huff_tbl_ptrs[i]) != NULL)
|
|
htbl->sent_table = suppress;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Finish JPEG compression.
|
|
*
|
|
* If a multipass operating mode was selected, this may do a great deal of
|
|
* work including most of the actual output.
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jpeg_finish_compress (j_compress_ptr cinfo)
|
|
{
|
|
JDIMENSION iMCU_row;
|
|
|
|
if (cinfo->global_state == CSTATE_SCANNING ||
|
|
cinfo->global_state == CSTATE_RAW_OK) {
|
|
/* Terminate first pass */
|
|
if (cinfo->next_scanline < cinfo->image_height)
|
|
ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
|
|
(*cinfo->master->finish_pass) (cinfo);
|
|
} else if (cinfo->global_state != CSTATE_WRCOEFS)
|
|
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
|
|
/* Perform any remaining passes */
|
|
while (! cinfo->master->is_last_pass) {
|
|
(*cinfo->master->prepare_for_pass) (cinfo);
|
|
for (iMCU_row = 0; iMCU_row < cinfo->total_iMCU_rows; iMCU_row++) {
|
|
if (cinfo->progress != NULL) {
|
|
cinfo->progress->pass_counter = (long) iMCU_row;
|
|
cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows;
|
|
(*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
|
|
}
|
|
/* We bypass the main controller and invoke coef controller directly;
|
|
* all work is being done from the coefficient buffer.
|
|
*/
|
|
if (! (*cinfo->coef->compress_data) (cinfo, (JSAMPIMAGE) NULL))
|
|
ERREXIT(cinfo, JERR_CANT_SUSPEND);
|
|
}
|
|
(*cinfo->master->finish_pass) (cinfo);
|
|
}
|
|
/* Write EOI, do final cleanup */
|
|
(*cinfo->marker->write_file_trailer) (cinfo);
|
|
(*cinfo->dest->term_destination) (cinfo);
|
|
/* We can use jpeg_abort to release memory and reset global_state */
|
|
jpeg_abort((j_common_ptr) cinfo);
|
|
}
|
|
|
|
|
|
/*
|
|
* Write a special marker.
|
|
* This is only recommended for writing COM or APPn markers.
|
|
* Must be called after jpeg_start_compress() and before
|
|
* first call to jpeg_write_scanlines() or jpeg_write_raw_data().
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jpeg_write_marker (j_compress_ptr cinfo, int marker,
|
|
const JOCTET *dataptr, unsigned int datalen)
|
|
{
|
|
JMETHOD(void, write_marker_byte, (j_compress_ptr info, int val));
|
|
|
|
if (cinfo->next_scanline != 0 ||
|
|
(cinfo->global_state != CSTATE_SCANNING &&
|
|
cinfo->global_state != CSTATE_RAW_OK &&
|
|
cinfo->global_state != CSTATE_WRCOEFS))
|
|
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
|
|
|
|
(*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
|
|
write_marker_byte = cinfo->marker->write_marker_byte; /* copy for speed */
|
|
while (datalen--) {
|
|
(*write_marker_byte) (cinfo, *dataptr);
|
|
dataptr++;
|
|
}
|
|
}
|
|
|
|
/* Same, but piecemeal. */
|
|
|
|
GLOBAL(void)
|
|
jpeg_write_m_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
|
|
{
|
|
if (cinfo->next_scanline != 0 ||
|
|
(cinfo->global_state != CSTATE_SCANNING &&
|
|
cinfo->global_state != CSTATE_RAW_OK &&
|
|
cinfo->global_state != CSTATE_WRCOEFS))
|
|
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
|
|
|
|
(*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
|
|
}
|
|
|
|
GLOBAL(void)
|
|
jpeg_write_m_byte (j_compress_ptr cinfo, int val)
|
|
{
|
|
(*cinfo->marker->write_marker_byte) (cinfo, val);
|
|
}
|
|
|
|
|
|
/*
|
|
* Alternate compression function: just write an abbreviated table file.
|
|
* Before calling this, all parameters and a data destination must be set up.
|
|
*
|
|
* To produce a pair of files containing abbreviated tables and abbreviated
|
|
* image data, one would proceed as follows:
|
|
*
|
|
* initialize JPEG object
|
|
* set JPEG parameters
|
|
* set destination to table file
|
|
* jpeg_write_tables(cinfo);
|
|
* set destination to image file
|
|
* jpeg_start_compress(cinfo, FALSE);
|
|
* write data...
|
|
* jpeg_finish_compress(cinfo);
|
|
*
|
|
* jpeg_write_tables has the side effect of marking all tables written
|
|
* (same as jpeg_suppress_tables(..., TRUE)). Thus a subsequent start_compress
|
|
* will not re-emit the tables unless it is passed write_all_tables=TRUE.
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jpeg_write_tables (j_compress_ptr cinfo)
|
|
{
|
|
if (cinfo->global_state != CSTATE_START)
|
|
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
|
|
|
|
/* (Re)initialize error mgr and destination modules */
|
|
(*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
|
|
(*cinfo->dest->init_destination) (cinfo);
|
|
/* Initialize the marker writer ... bit of a crock to do it here. */
|
|
jinit_marker_writer(cinfo);
|
|
/* Write them tables! */
|
|
(*cinfo->marker->write_tables_only) (cinfo);
|
|
/* And clean up. */
|
|
(*cinfo->dest->term_destination) (cinfo);
|
|
/*
|
|
* In library releases up through v6a, we called jpeg_abort() here to free
|
|
* any working memory allocated by the destination manager and marker
|
|
* writer. Some applications had a problem with that: they allocated space
|
|
* of their own from the library memory manager, and didn't want it to go
|
|
* away during write_tables. So now we do nothing. This will cause a
|
|
* memory leak if an app calls write_tables repeatedly without doing a full
|
|
* compression cycle or otherwise resetting the JPEG object. However, that
|
|
* seems less bad than unexpectedly freeing memory in the normal case.
|
|
* An app that prefers the old behavior can call jpeg_abort for itself after
|
|
* each call to jpeg_write_tables().
|
|
*/
|
|
}
|