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/*
* Copyright 2015 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 "SkData.h"
#include "SkImageDecoder.h"
#include "SkImageGenerator.h"
#include "SkStream.h"
class BareMemoryAllocator : public SkBitmap::Allocator {
const SkImageInfo fInfo;
void* const fMemory;
const size_t fRowBytes;
public:
BareMemoryAllocator(const SkImageInfo& info, void* memory, size_t rowBytes)
: fInfo(info), fMemory(memory), fRowBytes(rowBytes)
{}
protected:
bool allocPixelRef(SkBitmap* bm, SkColorTable* ctable) SK_OVERRIDE {
const SkImageInfo bmi = bm->info();
if (bmi.width() != fInfo.width() || bmi.height() != fInfo.height() ||
bmi.colorType() != fInfo.colorType())
{
return false;
}
return bm->installPixels(bmi, fMemory, fRowBytes, ctable, NULL, NULL);
}
};
class SkImageDecoderGenerator : public SkImageGenerator {
const SkImageInfo fInfo;
SkAutoTDelete<SkImageDecoder> fDecoder;
SkAutoTUnref<SkData> fData;
public:
SkImageDecoderGenerator(const SkImageInfo& info, SkImageDecoder* decoder, SkData* data)
: fInfo(info), fDecoder(decoder), fData(SkRef(data))
{}
protected:
SkData* onRefEncodedData() SK_OVERRIDE {
return SkRef(fData.get());
}
virtual bool onGetInfo(SkImageInfo* info) {
*info = fInfo;
return true;
}
virtual bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
SkPMColor ctableEntries[], int* ctableCount) {
SkMemoryStream stream(fData->data(), fData->size(), false);
SkAutoTUnref<BareMemoryAllocator> allocator(SkNEW_ARGS(BareMemoryAllocator,
(info, pixels, rowBytes)));
fDecoder->setAllocator(allocator);
fDecoder->setRequireUnpremultipliedColors(kUnpremul_SkAlphaType == info.alphaType());
SkBitmap bm;
SkImageDecoder::Result result = fDecoder->decode(&stream, &bm, info.colorType(),
SkImageDecoder::kDecodePixels_Mode);
switch (result) {
case SkImageDecoder::kSuccess:
break;
default:
return false;
}
SkASSERT(info.colorType() == bm.info().colorType());
if (kIndex_8_SkColorType == info.colorType()) {
SkASSERT(ctableEntries);
SkColorTable* ctable = bm.getColorTable();
if (NULL == ctable) {
return false;
}
const int count = ctable->count();
memcpy(ctableEntries, ctable->readColors(), count * sizeof(SkPMColor));
*ctableCount = count;
}
return true;
}
bool onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3],
SkYUVColorSpace* colorSpace) SK_OVERRIDE {
SkMemoryStream stream(fData->data(), fData->size(), false);
return fDecoder->decodeYUV8Planes(&stream, sizes, planes, rowBytes, colorSpace);
}
};
SkImageGenerator* SkImageGenerator::NewFromData(SkData* data) {
if (NULL == data) {
return NULL;
}
SkMemoryStream stream(data->data(), data->size(), false);
SkImageDecoder* decoder = SkImageDecoder::Factory(&stream);
if (NULL == decoder) {
return NULL;
}
SkBitmap bm;
stream.rewind();
if (!decoder->decode(&stream, &bm, kUnknown_SkColorType, SkImageDecoder::kDecodeBounds_Mode)) {
SkDELETE(decoder);
return NULL;
}
return SkNEW_ARGS(SkImageDecoderGenerator, (bm.info(), decoder, data));
}
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