3424c08b27
Replace the homegrown GIF parser and LZW decompressor with the wuffs GIF decoder, which is memory-safe by construction and already used in other engines via Skia. One behavior change is that `loop_count()` now reports the correct value, since the raw value stored in the file does not include the first frane and should be incremented by 1 to be compatible with what callers expect.
39 lines
1,017 B
C++
39 lines
1,017 B
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibGfx/ImageFormats/ImageDecoder.h>
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namespace Gfx {
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struct GIFLoadingContext;
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// Specified at: https://www.w3.org/Graphics/GIF/spec-gif89a.txt
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class GIFImageDecoderPlugin final : public ImageDecoderPlugin {
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public:
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static bool sniff(ReadonlyBytes);
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static ErrorOr<NonnullOwnPtr<ImageDecoderPlugin>> create(ReadonlyBytes);
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virtual ~GIFImageDecoderPlugin() override;
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virtual IntSize size() override;
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virtual bool is_animated() override;
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virtual size_t loop_count() override;
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virtual size_t frame_count() override;
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virtual size_t first_animated_frame_index() override;
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virtual ErrorOr<ImageFrameDescriptor> frame(size_t index, Optional<IntSize> ideal_size = {}) override;
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virtual int frame_duration(size_t index) override;
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private:
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explicit GIFImageDecoderPlugin(ReadonlyBytes);
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OwnPtr<GIFLoadingContext> m_context;
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};
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}
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