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/*
* Copyright 2010 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkJpegUtility.h"
/////////////////////////////////////////////////////////////////////
static void sk_init_source(j_decompress_ptr cinfo) {
skjpeg_source_mgr* src = (skjpeg_source_mgr*)cinfo->src;
src->next_input_byte = (const JOCTET*)src->fBuffer;
src->bytes_in_buffer = 0;
#ifdef SK_BUILD_FOR_ANDROID
src->current_offset = 0;
#endif
if (!src->fStream->rewind()) {
SkDebugf("xxxxxxxxxxxxxx failure to rewind\n");
cinfo->err->error_exit((j_common_ptr)cinfo);
}
}
#ifdef SK_BUILD_FOR_ANDROID
static boolean sk_seek_input_data(j_decompress_ptr cinfo, long byte_offset) {
skjpeg_source_mgr* src = (skjpeg_source_mgr*)cinfo->src;
size_t bo = (size_t) byte_offset;
if (bo > src->current_offset) {
(void)src->fStream->skip(bo - src->current_offset);
} else {
if (!src->fStream->rewind()) {
SkDebugf("xxxxxxxxxxxxxx failure to rewind\n");
cinfo->err->error_exit((j_common_ptr)cinfo);
return false;
}
(void)src->fStream->skip(bo);
}
src->current_offset = bo;
src->next_input_byte = (const JOCTET*)src->fBuffer;
src->bytes_in_buffer = 0;
return true;
}
#endif
static boolean sk_fill_input_buffer(j_decompress_ptr cinfo) {
skjpeg_source_mgr* src = (skjpeg_source_mgr*)cinfo->src;
if (src->fDecoder != NULL && src->fDecoder->shouldCancelDecode()) {
return FALSE;
}
size_t bytes = src->fStream->read(src->fBuffer, skjpeg_source_mgr::kBufferSize);
// note that JPEG is happy with less than the full read,
// as long as the result is non-zero
if (bytes == 0) {
return FALSE;
}
#ifdef SK_BUILD_FOR_ANDROID
src->current_offset += bytes;
#endif
src->next_input_byte = (const JOCTET*)src->fBuffer;
src->bytes_in_buffer = bytes;
return TRUE;
}
static void sk_skip_input_data(j_decompress_ptr cinfo, long num_bytes) {
skjpeg_source_mgr* src = (skjpeg_source_mgr*)cinfo->src;
if (num_bytes > (long)src->bytes_in_buffer) {
size_t bytesToSkip = num_bytes - src->bytes_in_buffer;
while (bytesToSkip > 0) {
size_t bytes = src->fStream->skip(bytesToSkip);
if (bytes <= 0 || bytes > bytesToSkip) {
// SkDebugf("xxxxxxxxxxxxxx failure to skip request %d returned %d\n", bytesToSkip, bytes);
cinfo->err->error_exit((j_common_ptr)cinfo);
return;
}
#ifdef SK_BUILD_FOR_ANDROID
src->current_offset += bytes;
#endif
bytesToSkip -= bytes;
}
src->next_input_byte = (const JOCTET*)src->fBuffer;
src->bytes_in_buffer = 0;
} else {
src->next_input_byte += num_bytes;
src->bytes_in_buffer -= num_bytes;
}
}
static void sk_term_source(j_decompress_ptr /*cinfo*/) {}
///////////////////////////////////////////////////////////////////////////////
skjpeg_source_mgr::skjpeg_source_mgr(SkStream* stream, SkImageDecoder* decoder)
: fStream(SkRef(stream))
, fDecoder(decoder) {
init_source = sk_init_source;
fill_input_buffer = sk_fill_input_buffer;
skip_input_data = sk_skip_input_data;
resync_to_restart = jpeg_resync_to_restart;
term_source = sk_term_source;
#ifdef SK_BUILD_FOR_ANDROID
seek_input_data = sk_seek_input_data;
#endif
// SkDebugf("**************** use memorybase %p %d\n", fMemoryBase, fMemoryBaseSize);
}
skjpeg_source_mgr::~skjpeg_source_mgr() {
SkSafeUnref(fStream);
}
///////////////////////////////////////////////////////////////////////////////
static void sk_init_destination(j_compress_ptr cinfo) {
skjpeg_destination_mgr* dest = (skjpeg_destination_mgr*)cinfo->dest;
dest->next_output_byte = dest->fBuffer;
dest->free_in_buffer = skjpeg_destination_mgr::kBufferSize;
}
static boolean sk_empty_output_buffer(j_compress_ptr cinfo) {
skjpeg_destination_mgr* dest = (skjpeg_destination_mgr*)cinfo->dest;
// if (!dest->fStream->write(dest->fBuffer, skjpeg_destination_mgr::kBufferSize - dest->free_in_buffer))
if (!dest->fStream->write(dest->fBuffer,
skjpeg_destination_mgr::kBufferSize)) {
ERREXIT(cinfo, JERR_FILE_WRITE);
return false;
}
dest->next_output_byte = dest->fBuffer;
dest->free_in_buffer = skjpeg_destination_mgr::kBufferSize;
return TRUE;
}
static void sk_term_destination (j_compress_ptr cinfo) {
skjpeg_destination_mgr* dest = (skjpeg_destination_mgr*)cinfo->dest;
size_t size = skjpeg_destination_mgr::kBufferSize - dest->free_in_buffer;
if (size > 0) {
if (!dest->fStream->write(dest->fBuffer, size)) {
ERREXIT(cinfo, JERR_FILE_WRITE);
return;
}
}
dest->fStream->flush();
}
skjpeg_destination_mgr::skjpeg_destination_mgr(SkWStream* stream)
: fStream(stream) {
this->init_destination = sk_init_destination;
this->empty_output_buffer = sk_empty_output_buffer;
this->term_destination = sk_term_destination;
}
void skjpeg_error_exit(j_common_ptr cinfo) {
skjpeg_error_mgr* error = (skjpeg_error_mgr*)cinfo->err;
(*error->output_message) (cinfo);
/* Let the memory manager delete any temp files before we die */
jpeg_destroy(cinfo);
longjmp(error->fJmpBuf, -1);
}
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