зеркало из https://github.com/mozilla/gecko-dev.git
106 строки
3.5 KiB
C++
106 строки
3.5 KiB
C++
/* vim:set tw=80 expandtab softtabstop=4 ts=4 sw=4: */
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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_nsICODecoder_h
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#define mozilla_image_decoders_nsICODecoder_h
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#include "StreamingLexer.h"
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#include "Decoder.h"
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#include "imgFrame.h"
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#include "mozilla/gfx/2D.h"
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#include "nsBMPDecoder.h"
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#include "nsPNGDecoder.h"
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#include "ICOFileHeaders.h"
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namespace mozilla {
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namespace image {
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class RasterImage;
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enum class ICOState
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{
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HEADER,
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DIR_ENTRY,
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FINISHED_DIR_ENTRY,
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ITERATE_UNSIZED_DIR_ENTRY,
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SKIP_TO_RESOURCE,
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FOUND_RESOURCE,
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SNIFF_RESOURCE,
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READ_RESOURCE,
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PREPARE_FOR_MASK,
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READ_MASK_ROW,
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FINISH_MASK,
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SKIP_MASK,
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FINISHED_RESOURCE
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};
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class nsICODecoder : public Decoder
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{
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public:
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virtual ~nsICODecoder() { }
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/// @return The offset from the beginning of the ICO to the first resource.
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size_t FirstResourceOffset() const;
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DecoderType GetType() const override { return DecoderType::ICO; }
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LexerResult DoDecode(SourceBufferIterator& aIterator,
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IResumable* aOnResume) override;
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nsresult FinishInternal() override;
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nsresult FinishWithErrorInternal() 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 nsICODecoder(RasterImage* aImage);
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// Flushes the contained decoder to read all available data and sets the
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// appropriate errors. Returns true if there are no errors.
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bool FlushContainedDecoder();
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// Gets decoder state from the contained decoder so it's visible externally.
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nsresult GetFinalStateFromContainedDecoder();
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// Obtains the number of colors from the BPP, mBPP must be filled in
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uint16_t GetNumColors();
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LexerTransition<ICOState> ReadHeader(const char* aData);
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LexerTransition<ICOState> ReadDirEntry(const char* aData);
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LexerTransition<ICOState> IterateUnsizedDirEntry();
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LexerTransition<ICOState> FinishDirEntry();
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LexerTransition<ICOState> SniffResource(const char* aData);
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LexerTransition<ICOState> ReadResource();
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LexerTransition<ICOState> ReadBIH(const char* aData);
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LexerTransition<ICOState> PrepareForMask();
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LexerTransition<ICOState> ReadMaskRow(const char* aData);
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LexerTransition<ICOState> FinishMask();
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LexerTransition<ICOState> FinishResource();
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struct IconDirEntryEx : public IconDirEntry {
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gfx::IntSize mSize;
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};
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StreamingLexer<ICOState, 32> mLexer; // The lexer.
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RefPtr<Decoder> mContainedDecoder; // Either a BMP or PNG decoder.
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Maybe<SourceBufferIterator> mReturnIterator; // Iterator to save return point.
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UniquePtr<uint8_t[]> mMaskBuffer; // A temporary buffer for the alpha mask.
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nsTArray<IconDirEntryEx> mDirEntries; // Valid dir entries with a size.
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nsTArray<IconDirEntryEx> mUnsizedDirEntries; // Dir entries without a size.
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IconDirEntryEx* mDirEntry; // The dir entry for the selected resource.
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uint16_t mNumIcons; // Stores the number of icons in the ICO file.
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uint16_t mCurrIcon; // Stores the current dir entry index we are processing.
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uint16_t mBPP; // The BPP of the resource we're decoding.
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uint32_t mMaskRowSize; // The size in bytes of each row in the BMP alpha mask.
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uint32_t mCurrMaskLine; // The line of the BMP alpha mask we're processing.
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bool mIsCursor; // Is this ICO a cursor?
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bool mHasMaskAlpha; // Did the BMP alpha mask have any transparency?
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_decoders_nsICODecoder_h
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