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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 "SkScanlineDecoder.h"
#include "SkBmpCodec.h"
#include "SkCodec_libgif.h"
#include "SkCodec_libpng.h"
#include "SkCodec_wbmp.h"
#include "SkCodecPriv.h"
#ifndef SK_BUILD_FOR_ANDROID_FRAMEWORK
#include "SkJpegCodec.h"
#endif
struct DecoderProc {
bool (*IsFormat)(SkStream*);
SkScanlineDecoder* (*NewFromStream)(SkStream*);
};
static const DecoderProc gDecoderProcs[] = {
{ SkPngCodec::IsPng, SkPngCodec::NewSDFromStream },
#ifndef SK_BUILD_FOR_ANDROID_FRAMEWORK
{ SkJpegCodec::IsJpeg, SkJpegCodec::NewSDFromStream },
#endif
{ SkGifCodec::IsGif, SkGifCodec::NewSDFromStream },
{ SkBmpCodec::IsBmp, SkBmpCodec::NewSDFromStream },
{ SkWbmpCodec::IsWbmp, SkWbmpCodec::NewSDFromStream },
};
SkScanlineDecoder* SkScanlineDecoder::NewFromStream(SkStream* stream) {
if (!stream) {
return nullptr;
}
SkAutoTDelete<SkStream> streamDeleter(stream);
SkAutoTDelete<SkScanlineDecoder> codec(nullptr);
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 nullptr;
}
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 nullptr;
} else {
return codec.detach();
}
}
SkScanlineDecoder* SkScanlineDecoder::NewFromData(SkData* data) {
if (!data) {
return nullptr;
}
return NewFromStream(new SkMemoryStream(data));
}
SkCodec::Result SkScanlineDecoder::start(const SkImageInfo& dstInfo,
const SkCodec::Options* options, SkPMColor ctable[], int* ctableCount) {
// Ensure that valid color ptrs are passed in for kIndex8 color type
if (kIndex_8_SkColorType == dstInfo.colorType()) {
if (nullptr == ctable || nullptr == ctableCount) {
return SkCodec::kInvalidParameters;
}
} else {
if (ctableCount) {
*ctableCount = 0;
}
ctableCount = nullptr;
ctable = nullptr;
}
// Set options.
SkCodec::Options optsStorage;
if (nullptr == options) {
options = &optsStorage;
}
const SkCodec::Result result = this->onStart(dstInfo, *options, ctable, ctableCount);
if (result != SkCodec::kSuccess) {
return result;
}
fCurrScanline = 0;
fDstInfo = dstInfo;
fOptions = *options;
return SkCodec::kSuccess;
}
SkCodec::Result SkScanlineDecoder::start(const SkImageInfo& dstInfo) {
return this->start(dstInfo, nullptr, nullptr, nullptr);
}
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