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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_image_decoders_nsWebPDecoder_h
+#define mozilla_image_decoders_nsWebPDecoder_h
+
+#include "Decoder.h"
+#include "webp/demux.h"
+#include "StreamingLexer.h"
+#include "SurfacePipe.h"
+
+namespace mozilla {
+namespace image {
+class RasterImage;
+
+class nsWebPDecoder final : public Decoder {
+ public:
+ virtual ~nsWebPDecoder();
+
+ DecoderType GetType() const override { return DecoderType::WEBP; }
+
+ protected:
+ LexerResult DoDecode(SourceBufferIterator& aIterator,
+ IResumable* aOnResume) override;
+ Maybe<Telemetry::HistogramID> SpeedHistogram() const override;
+
+ private:
+ friend class DecoderFactory;
+
+ // Decoders should only be instantiated via DecoderFactory.
+ explicit nsWebPDecoder(RasterImage* aImage);
+
+ void ApplyColorProfile(const char* aProfile, size_t aLength);
+
+ LexerResult UpdateBuffer(SourceBufferIterator& aIterator,
+ SourceBufferIterator::State aState);
+ LexerResult ReadData();
+ LexerResult ReadHeader(WebPDemuxer* aDemuxer, bool aIsComplete);
+ LexerResult ReadPayload(WebPDemuxer* aDemuxer, bool aIsComplete);
+
+ nsresult CreateFrame(const OrientedIntRect& aFrameRect);
+ void EndFrame();
+
+ LexerResult ReadSingle(const uint8_t* aData, size_t aLength,
+ const OrientedIntRect& aFrameRect);
+
+ LexerResult ReadMultiple(WebPDemuxer* aDemuxer, bool aIsComplete);
+
+ /// The SurfacePipe used to write to the output surface.
+ SurfacePipe mPipe;
+
+ /// The buffer used to accumulate data until the complete WebP header is
+ /// received, if and only if the iterator is discontiguous.
+ Vector<uint8_t> mBufferedData;
+
+ /// The libwebp output buffer descriptor pointing to the decoded data.
+ WebPDecBuffer mBuffer;
+
+ /// The libwebp incremental decoder descriptor, wraps mBuffer.
+ WebPIDecoder* mDecoder;
+
+ /// Blend method for the current frame.
+ BlendMethod mBlend;
+
+ /// Disposal method for the current frame.
+ DisposalMethod mDisposal;
+
+ /// Frame timeout for the current frame;
+ FrameTimeout mTimeout;
+
+ /// Surface format for the current frame.
+ gfx::SurfaceFormat mFormat;
+
+ /// Frame rect for the current frame.
+ OrientedIntRect mFrameRect;
+
+ /// The last row of decoded pixels written to mPipe.
+ int mLastRow;
+
+ /// Number of decoded frames.
+ uint32_t mCurrentFrame;
+
+ /// Pointer to the start of the contiguous encoded image data.
+ const uint8_t* mData;
+
+ /// Length of data pointed to by mData.
+ size_t mLength;
+
+ /// True if the iterator has reached its end.
+ bool mIteratorComplete;
+
+ /// True if this decoding pass requires a WebPDemuxer.
+ bool mNeedDemuxer;
+
+ /// True if we have setup the color profile for the image.
+ bool mGotColorProfile;
+};
+
+} // namespace image
+} // namespace mozilla
+
+#endif // mozilla_image_decoders_nsWebPDecoder_h