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LibGfx: Add scaffolding for a webp decoder

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At the moment, this processes the RIFF chunk structure and extracts
the ICCP chunk, so that `icc` can now print ICC profiles embedded
in webp files. (And are image files really more than containers
of icc profiles?)

It doesn't even decode image dimensions yet.

The lossy format is a VP8 video frame. Once we get to that, we
might want to move all the image decoders into a new LibImageDecoders
that depends on both LibGfx and LibVideo. (Other newer image formats
like heic and av1f also use video frames for image data.)
This commit is contained in:
Nico Weber 2023-02-23 22:37:08 -05:00 • committed by Linus Groh
parent 4bf639b635
commit f7e152d049
7 changed files with 359 additions and 0 deletions
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38
Userland/Libraries/LibGfx/WebPLoader.h Normal file
View file

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/*
* Copyright (c) 2023, Nico Weber <thakis@chromium.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibGfx/ImageDecoder.h>
namespace Gfx {
struct WebPLoadingContext;
class WebPImageDecoderPlugin final : public ImageDecoderPlugin {
public:
static ErrorOr<bool> sniff(ReadonlyBytes);
static ErrorOr<NonnullOwnPtr<ImageDecoderPlugin>> create(ReadonlyBytes);
virtual ~WebPImageDecoderPlugin() override;
virtual IntSize size() override;
virtual void set_volatile() override;
[[nodiscard]] virtual bool set_nonvolatile(bool& was_purged) override;
virtual bool initialize() override;
virtual bool is_animated() override;
virtual size_t loop_count() override;
virtual size_t frame_count() override;
virtual ErrorOr<ImageFrameDescriptor> frame(size_t index) override;
virtual ErrorOr<Optional<ReadonlyBytes>> icc_data() override;
private:
WebPImageDecoderPlugin(ReadonlyBytes, OwnPtr<WebPLoadingContext>);
OwnPtr<WebPLoadingContext> m_context;
};
}