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authorwolfbeast <mcwerewolf@gmail.com>2017-07-24 13:29:29 +0200
committerwolfbeast <mcwerewolf@gmail.com>2018-02-03 10:03:50 +0100
commit3e0351aa49be56434df121d9b4d9f283c422a670 (patch)
tree66e587490ddf75684fa3657486e99b56a8db8626 /image/decoders/nsWebPDecoder.h
parentb094b135956829a293dd409eefa39f2912434fd9 (diff)
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Implement WebP image decoder.
Diffstat (limited to 'image/decoders/nsWebPDecoder.h')
-rw-r--r--image/decoders/nsWebPDecoder.h91
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diff --git a/image/decoders/nsWebPDecoder.h b/image/decoders/nsWebPDecoder.h
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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 : public Decoder
+{
+public:
+ virtual ~nsWebPDecoder();
+
+protected:
+ LexerResult DoDecode(SourceBufferIterator& aIterator,
+ IResumable* aOnResume) override;
+
+private:
+ friend class DecoderFactory;
+
+ // Decoders should only be instantiated via DecoderFactory.
+ explicit nsWebPDecoder(RasterImage* aImage);
+
+ enum class State
+ {
+ WEBP_DATA,
+ FINISHED_WEBP_DATA
+ };
+
+ LexerTransition<State> ReadHeader(const char* aData, size_t aLength);
+ LexerTransition<State> ReadPayload(const char* aData, size_t aLength);
+ LexerTransition<State> FinishedData();
+
+ nsresult CreateFrame(const nsIntRect& aFrameRect);
+ void EndFrame();
+
+ nsresult GetDataBuffer(const uint8_t*& aData, size_t& aLength);
+ nsresult SaveDataBuffer(const uint8_t* aData, size_t aLength);
+
+ LexerTransition<State> ReadSingle(const uint8_t* aData, size_t aLength,
+ bool aAppend, const IntRect& aFrameRect);
+
+ LexerTransition<State> ReadMultiple(const uint8_t* aData, size_t aLength);
+
+ StreamingLexer<State> mLexer;
+
+ /// The SurfacePipe used to write to the output surface.
+ SurfacePipe mPipe;
+
+ /// The buffer used to accumulate data until the complete WebP header is received.
+ Vector<uint8_t> mData;
+
+ /// 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;
+
+ /// The last row of decoded pixels written to mPipe.
+ int mLastRow;
+
+ /// Number of decoded frames.
+ uint32_t mCurrentFrame;
+};
+
+} // namespace image
+} // namespace mozilla
+
+#endif // mozilla_image_decoders_nsWebPDecoder_h