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3a4e0c2804
The high-level design is that we have a static method on WebPWriter that returns an AnimationWriter object. AnimationWriter has a virtual method for writing individual frames. This allows streaming animations to disk, without having to buffer up the entire animation in memory first. The semantics of this function, add_frame(), are that data is flushed to disk every time the function is called, so that no explicit `close()` method is needed. For some formats that store animation length at the start of the file, including WebP, this means that this needs to write to a SeekableStream, so that add_frame() can seek to the start and update the size when a frame is written. This design should work for GIF and APNG writing as well. We can move AnimationWriter to a new header if we add writers for these. Currently, `animation` can read any animated image format we can read (apng, gif, webp) and convert it to an animated webp file. The written animated webp file is not compressed whatsoever, so this creates large output files at the moment.
45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
/*
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* Copyright (c) 2024, Nico Weber <thakis@chromium.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/Error.h>
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#include <LibGfx/Color.h>
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#include <LibGfx/Forward.h>
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#include <LibGfx/Point.h>
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namespace Gfx {
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struct WebPEncoderOptions {
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Optional<ReadonlyBytes> icc_data;
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};
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class AnimationWriter {
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public:
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virtual ~AnimationWriter() = default;
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// Flushes the frame to disk.
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// IntRect { at, at + bitmap.size() } must fit in the dimensions
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// passed to `start_writing_animation()`.
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// FIXME: Consider passing in disposal method and blend mode.
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virtual ErrorOr<void> add_frame(Bitmap&, int duration_ms, IntPoint at = {}) = 0;
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};
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class WebPWriter {
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public:
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using Options = WebPEncoderOptions;
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// Always lossless at the moment.
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static ErrorOr<void> encode(Stream&, Bitmap const&, Options const& = {});
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// Always lossless at the moment.
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static ErrorOr<NonnullOwnPtr<AnimationWriter>> start_encoding_animation(SeekableStream&, IntSize dimensions, int loop_count = 0, Color background_color = Color::Black, Options const& = {});
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private:
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WebPWriter() = delete;
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};
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}
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