chromium/third_party/skia/src/codec/SkJpegUtility.cpp

/*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "src/codec/SkJpegUtility.h"

#include "include/core/SkStream.h"
#include "include/core/SkTypes.h"
#include "src/codec/SkCodecPriv.h"
#include "src/codec/SkJpegPriv.h"

#include <csetjmp>
#include <cstddef>

extern "C" {
    #include "jpeglib.h"   // NO_G3_REWRITE
}

/*
 * Call longjmp to continue execution on an error
 */
void skjpeg_err_exit(j_common_ptr dinfo) { … }

// Functions for buffered sources //

/*
 * Initialize the buffered source manager
 */
static void sk_init_buffered_source(j_decompress_ptr dinfo) { … }

/*
 * Fill the input buffer from the stream
 */
static boolean sk_fill_buffered_input_buffer(j_decompress_ptr dinfo) { … }

/*
 * Skip a certain number of bytes in the stream
 */
static void sk_skip_buffered_input_data(j_decompress_ptr dinfo, long numBytes) { … }

/*
 * We do not need to do anything to terminate our stream
 */
static void sk_term_source(j_decompress_ptr dinfo)
{ … }

// Functions for memory backed sources //

/*
 * Initialize the mem backed source manager
 */
static void sk_init_mem_source(j_decompress_ptr dinfo) { … }

static void sk_skip_mem_input_data (j_decompress_ptr cinfo, long num_bytes) { … }

static boolean sk_fill_mem_input_buffer (j_decompress_ptr cinfo) { … }

/*
 * Constructor for the source manager that we provide to libjpeg
 * We provide skia implementations of all of the stream processing functions required by libjpeg
 */
skjpeg_source_mgr::skjpeg_source_mgr(SkStream* stream)
    : … { … }