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e7cddda7e1
The ideal size is the size the user will display the image. Raster formats should ignore this parameter, but vector formats can use it to generate a bitmap of the ideal size.
71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
/*
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* Copyright (c) 2021, Linus Groh <linusg@serenityos.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 <AK/Forward.h>
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#include <LibGfx/Forward.h>
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#include <LibGfx/ImageFormats/ImageDecoder.h>
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namespace Gfx {
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// Decoder for the "Quite OK Image" format (v1.0).
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// https://qoiformat.org/qoi-specification.pdf
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struct [[gnu::packed]] QOIHeader {
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char magic[4];
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u32 width;
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u32 height;
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u8 channels;
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u8 colorspace;
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};
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struct QOILoadingContext {
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enum class State {
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NotDecoded = 0,
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HeaderDecoded,
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ImageDecoded,
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Error,
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};
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State state { State::NotDecoded };
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OwnPtr<Stream> stream {};
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QOIHeader header {};
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RefPtr<Bitmap> bitmap;
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};
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class QOIImageDecoderPlugin 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 ~QOIImageDecoderPlugin() override = default;
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virtual IntSize size() override;
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virtual void set_volatile() override;
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[[nodiscard]] virtual bool set_nonvolatile(bool& was_purged) override;
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virtual ErrorOr<void> initialize() override;
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virtual bool is_animated() override { return false; }
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virtual size_t loop_count() override { return 0; }
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virtual size_t frame_count() override { return 1; }
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virtual size_t first_animated_frame_index() override { return 0; }
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virtual ErrorOr<ImageFrameDescriptor> frame(size_t index, Optional<IntSize> ideal_size = {}) override;
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virtual ErrorOr<Optional<ReadonlyBytes>> icc_data() override;
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private:
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ErrorOr<void> decode_header_and_update_context(Stream&);
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ErrorOr<void> decode_image_and_update_context(Stream&);
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QOIImageDecoderPlugin(NonnullOwnPtr<Stream>);
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OwnPtr<QOILoadingContext> m_context;
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};
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}
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template<>
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struct AK::Traits<Gfx::QOIHeader> : public GenericTraits<Gfx::QOIHeader> {
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static constexpr bool is_trivially_serializable() { return true; }
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};
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