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c7b01ecbda
CLOSED TREE Backed out changeset 652c909b75ad (bug 1290293) Backed out changeset 90a284ea19e3 (bug 1290292) Backed out changeset 8401d12fe936 (bug 1290293) Backed out changeset d87488b69c18 (bug 1290293) Backed out changeset 7368aa665fae (bug 1290293)
68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_image_decoders_nsIconDecoder_h
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#define mozilla_image_decoders_nsIconDecoder_h
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#include "Decoder.h"
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#include "StreamingLexer.h"
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#include "SurfacePipe.h"
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namespace mozilla {
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namespace image {
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class RasterImage;
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////////////////////////////////////////////////////////////////////////////////
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// The icon decoder is a decoder specifically tailored for loading icons
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// from the OS. We've defined our own little format to represent these icons
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// and this decoder takes that format and converts it into 24-bit RGB with
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// alpha channel support. It was modeled a bit off the PPM decoder.
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//
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// The format of the incoming data is as follows:
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//
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// The first two bytes contain the width and the height of the icon.
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// The remaining bytes contain the icon data, 4 bytes per pixel, in
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// ARGB order (platform endianness, A in highest bits, B in lowest
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// bits), row-primary, top-to-bottom, left-to-right, with
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// premultiplied alpha.
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//
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////////////////////////////////////////////////////////////////////////////////
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class nsIconDecoder : public Decoder
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{
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public:
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virtual ~nsIconDecoder();
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LexerResult DoDecode(SourceBufferIterator& aIterator,
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IResumable* aOnResume) override;
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private:
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friend class DecoderFactory;
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// Decoders should only be instantiated via DecoderFactory.
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explicit nsIconDecoder(RasterImage* aImage);
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enum class State {
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HEADER,
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ROW_OF_PIXELS,
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FINISH
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};
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LexerTransition<State> ReadHeader(const char* aData);
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LexerTransition<State> ReadRowOfPixels(const char* aData, size_t aLength);
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LexerTransition<State> Finish();
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StreamingLexer<State> mLexer;
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SurfacePipe mPipe;
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uint32_t mBytesPerRow;
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_decoders_nsIconDecoder_h
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