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/*
* 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 "SkCodec.h"
#include "SkData.h"
#include "SkCodec_libbmp.h"
#include "SkCodec_libgif.h"
#include "SkCodec_libico.h"
#include "SkCodec_libpng.h"
#include "SkCodec_wbmp.h"
#include "SkCodecPriv.h"
#ifndef SK_BUILD_FOR_ANDROID_FRAMEWORK
#include "SkJpegCodec.h"
#endif
#include "SkStream.h"
#include "SkWebpCodec.h"
struct DecoderProc {
bool (*IsFormat)(SkStream*);
SkCodec* (*NewFromStream)(SkStream*);
};
static const DecoderProc gDecoderProcs[] = {
{ SkPngCodec::IsPng, SkPngCodec::NewFromStream },
#ifndef SK_BUILD_FOR_ANDROID_FRAMEWORK
{ SkJpegCodec::IsJpeg, SkJpegCodec::NewFromStream },
#endif
{ SkWebpCodec::IsWebp, SkWebpCodec::NewFromStream },
{ SkGifCodec::IsGif, SkGifCodec::NewFromStream },
{ SkIcoCodec::IsIco, SkIcoCodec::NewFromStream },
{ SkBmpCodec::IsBmp, SkBmpCodec::NewFromStream },
{ SkWbmpCodec::IsWbmp, SkWbmpCodec::NewFromStream }
};
SkCodec* SkCodec::NewFromStream(SkStream* stream) {
if (!stream) {
return NULL;
}
SkAutoTDelete<SkStream> streamDeleter(stream);
SkAutoTDelete<SkCodec> codec(NULL);
for (uint32_t i = 0; i < SK_ARRAY_COUNT(gDecoderProcs); i++) {
DecoderProc proc = gDecoderProcs[i];
const bool correctFormat = proc.IsFormat(stream);
if (!stream->rewind()) {
return NULL;
}
if (correctFormat) {
codec.reset(proc.NewFromStream(streamDeleter.detach()));
break;
}
}
// Set the max size at 128 megapixels (512 MB for kN32).
// This is about 4x smaller than a test image that takes a few minutes for
// dm to decode and draw.
const int32_t maxSize = 1 << 27;
if (codec && codec->getInfo().width() * codec->getInfo().height() > maxSize) {
SkCodecPrintf("Error: Image size too large, cannot decode.\n");
return NULL;
} else {
return codec.detach();
}
}
SkCodec* SkCodec::NewFromData(SkData* data) {
if (!data) {
return NULL;
}
return NewFromStream(SkNEW_ARGS(SkMemoryStream, (data)));
}
SkCodec::SkCodec(const SkImageInfo& info, SkStream* stream)
: INHERITED(info)
, fStream(stream)
, fNeedsRewind(false)
{}
SkCodec::RewindState SkCodec::rewindIfNeeded() {
// Store the value of fNeedsRewind so we can update it. Next read will
// require a rewind.
const bool needsRewind = fNeedsRewind;
fNeedsRewind = true;
if (!needsRewind) {
return kNoRewindNecessary_RewindState;
}
return fStream->rewind() ? kRewound_RewindState
: kCouldNotRewind_RewindState;
}
SkScanlineDecoder* SkCodec::getScanlineDecoder(const SkImageInfo& dstInfo, const Options* options,
SkPMColor ctable[], int* ctableCount) {
// Set options.
Options optsStorage;
if (NULL == options) {
options = &optsStorage;
}
fScanlineDecoder.reset(this->onGetScanlineDecoder(dstInfo, *options, ctable, ctableCount));
return fScanlineDecoder.get();
}
SkScanlineDecoder* SkCodec::getScanlineDecoder(const SkImageInfo& dstInfo) {
SkASSERT(kIndex_8_SkColorType != dstInfo.colorType());
if (kIndex_8_SkColorType == dstInfo.colorType()) {
return NULL;
}
return this->getScanlineDecoder(dstInfo, NULL, NULL, NULL);
}
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