| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #ifndef SkScaledCodec_DEFINED |
| #define SkScaledCodec_DEFINED |
| |
| #include "SkCodec.h" |
| |
| class SkStream; |
| |
| /** |
| * This class implements scaling, by sampling scanlines in the y direction. |
| * x-wise sampling is implemented in the swizzler, when getScanlines() is called. |
| */ |
| class SkScaledCodec : public SkCodec { |
| public: |
| static SkCodec* NewFromStream(SkStream*); |
| static SkCodec* NewFromData(SkData*); |
| |
| virtual ~SkScaledCodec(); |
| |
| static void ComputeSampleSize(const SkISize& dstDim, const SkISize& srcDim, |
| int* sampleSizeX, int* sampleSizeY); |
| |
| protected: |
| bool onRewind() override; |
| |
| /** |
| * Recommend a set of destination dimensions given a requested scale |
| */ |
| SkISize onGetScaledDimensions(float desiredScale) const override; |
| bool onDimensionsSupported(const SkISize&) override; |
| |
| Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMColor*, int*) |
| override; |
| SkEncodedFormat onGetEncodedFormat() const override { |
| return fCodec->getEncodedFormat(); |
| } |
| |
| bool onReallyHasAlpha() const override { |
| return fCodec->reallyHasAlpha(); |
| } |
| |
| private: |
| |
| SkAutoTDelete<SkCodec> fCodec; |
| |
| explicit SkScaledCodec(SkCodec*); |
| |
| typedef SkCodec INHERITED; |
| }; |
| #endif // SkScaledCodec_DEFINED |