1 /* 2 * Copyright 2015 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkWebpCodec_DEFINED 9 #define SkWebpCodec_DEFINED 10 11 #include "SkCodec.h" 12 #include "SkColorSpace.h" 13 #include "SkEncodedImageFormat.h" 14 #include "SkImageInfo.h" 15 #include "SkTypes.h" 16 17 class SkStream; 18 extern "C" { 19 struct WebPDemuxer; 20 void WebPDemuxDelete(WebPDemuxer* dmux); 21 } 22 23 static const size_t WEBP_VP8_HEADER_SIZE = 30; 24 25 class SkWebpCodec final : public SkCodec { 26 public: 27 // Assumes IsWebp was called and returned true. 28 static SkCodec* NewFromStream(SkStream*); 29 static bool IsWebp(const void*, size_t); 30 protected: 31 Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMColor*, int*, int*) 32 override; onGetEncodedFormat()33 SkEncodedImageFormat onGetEncodedFormat() const override { return SkEncodedImageFormat::kWEBP; } 34 35 SkISize onGetScaledDimensions(float desiredScale) const override; 36 37 bool onDimensionsSupported(const SkISize&) override; 38 39 bool onGetValidSubset(SkIRect* /* desiredSubset */) const override; 40 private: 41 SkWebpCodec(int width, int height, const SkEncodedInfo&, sk_sp<SkColorSpace>, SkStream*, 42 WebPDemuxer*, sk_sp<SkData>); 43 44 SkAutoTCallVProc<WebPDemuxer, WebPDemuxDelete> fDemux; 45 46 // fDemux has a pointer into this data. 47 // This should not be freed until the decode is completed. 48 sk_sp<SkData> fData; 49 50 typedef SkCodec INHERITED; 51 }; 52 #endif // SkWebpCodec_DEFINED 53