| /* |
| * 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) 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, nullptr, nullptr); |
| } |
| }; |
| |
| class SkImageDecoderGenerator : public SkImageGenerator { |
| const SkImageInfo fInfo; |
| SkAutoTDelete<SkImageDecoder> fDecoder; |
| SkAutoTUnref<SkData> fData; |
| |
| public: |
| SkImageDecoderGenerator(const SkImageInfo& info, SkImageDecoder* decoder, SkData* data) |
| : INHERITED(info), fInfo(info), fDecoder(decoder), fData(SkRef(data)) |
| {} |
| |
| protected: |
| SkData* onRefEncodedData() override { |
| return SkRef(fData.get()); |
| } |
| bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, |
| SkPMColor ctableEntries[], int* ctableCount) override { |
| SkMemoryStream stream(fData->data(), fData->size(), false); |
| SkAutoTUnref<BareMemoryAllocator> allocator( |
| new BareMemoryAllocator(info, pixels, rowBytes)); |
| fDecoder->setAllocator(allocator); |
| fDecoder->setRequireUnpremultipliedColors(kUnpremul_SkAlphaType == info.alphaType()); |
| |
| SkBitmap bm; |
| const SkImageDecoder::Result result = fDecoder->decode(&stream, &bm, info.colorType(), |
| SkImageDecoder::kDecodePixels_Mode); |
| if (SkImageDecoder::kFailure == result) { |
| return false; |
| } |
| |
| SkASSERT(info.colorType() == bm.info().colorType()); |
| |
| if (kIndex_8_SkColorType == info.colorType()) { |
| SkASSERT(ctableEntries); |
| |
| SkColorTable* ctable = bm.getColorTable(); |
| if (nullptr == 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) override { |
| SkMemoryStream stream(fData->data(), fData->size(), false); |
| return fDecoder->decodeYUV8Planes(&stream, sizes, planes, rowBytes, colorSpace); |
| } |
| |
| private: |
| typedef SkImageGenerator INHERITED; |
| }; |
| |
| SkImageGenerator* SkImageGenerator::NewFromEncodedImpl(SkData* data) { |
| SkMemoryStream stream(data->data(), data->size(), false); |
| SkImageDecoder* decoder = SkImageDecoder::Factory(&stream); |
| if (nullptr == decoder) { |
| return nullptr; |
| } |
| |
| SkBitmap bm; |
| stream.rewind(); |
| if (!decoder->decode(&stream, &bm, kUnknown_SkColorType, SkImageDecoder::kDecodeBounds_Mode)) { |
| delete decoder; |
| return nullptr; |
| } |
| |
| return new SkImageDecoderGenerator(bm.info(), decoder, data); |
| } |