649f78d0a4
Because TGA images don't have magic bytes as a signature to be detected, instead assume a sequence of ReadonlyBytes is a possible TGA image only if we are given a path so we could check the extension of the file and see if it's a TGA image. When we know the path of the file being loaded, we will try to first check its extension, and only if there's no match to a known decoder, based on simple extension lookup, then we would probe for other formats as usual with the normal sniffing method.
71 lines
2 KiB
C++
71 lines
2 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@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/ByteBuffer.h>
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#include <AK/OwnPtr.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <LibGfx/Bitmap.h>
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#include <LibGfx/Size.h>
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namespace Gfx {
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class Bitmap;
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static constexpr size_t maximum_width_for_decoded_images = 16384;
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static constexpr size_t maximum_height_for_decoded_images = 16384;
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struct ImageFrameDescriptor {
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RefPtr<Bitmap> image;
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int duration { 0 };
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};
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class ImageDecoderPlugin {
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public:
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virtual ~ImageDecoderPlugin() = default;
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virtual IntSize size() = 0;
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virtual void set_volatile() = 0;
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[[nodiscard]] virtual bool set_nonvolatile(bool& was_purged) = 0;
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virtual bool sniff() = 0;
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virtual bool is_animated() = 0;
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virtual size_t loop_count() = 0;
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virtual size_t frame_count() = 0;
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virtual ErrorOr<ImageFrameDescriptor> frame(size_t index) = 0;
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protected:
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ImageDecoderPlugin() = default;
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};
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class ImageDecoder : public RefCounted<ImageDecoder> {
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public:
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static RefPtr<ImageDecoder> try_create_for_raw_bytes(ReadonlyBytes);
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static RefPtr<ImageDecoder> try_create_for_raw_bytes_with_known_path(StringView path, ReadonlyBytes);
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~ImageDecoder() = default;
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IntSize size() const { return m_plugin->size(); }
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int width() const { return size().width(); }
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int height() const { return size().height(); }
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void set_volatile() { m_plugin->set_volatile(); }
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[[nodiscard]] bool set_nonvolatile(bool& was_purged) { return m_plugin->set_nonvolatile(was_purged); }
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bool sniff() const { return m_plugin->sniff(); }
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bool is_animated() const { return m_plugin->is_animated(); }
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size_t loop_count() const { return m_plugin->loop_count(); }
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size_t frame_count() const { return m_plugin->frame_count(); }
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ErrorOr<ImageFrameDescriptor> frame(size_t index) const { return m_plugin->frame(index); }
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private:
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explicit ImageDecoder(NonnullOwnPtr<ImageDecoderPlugin>);
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NonnullOwnPtr<ImageDecoderPlugin> mutable m_plugin;
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};
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}
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