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https://github.com/LadybirdBrowser/ladybird.git
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97986f9739
Add AnimatedDecodedImageData which implements DecodedImageData with an 8-slot buffer pool instead of storing all frames in memory. Frames are requested on demand from the ImageDecoder service as the animation progresses. For a 344-frame animated image at 1920x1080, this reduces WebContent memory from ~1.3 GB to ~66 MB. The streaming class owns frame progression and synchronizes multiple callers (HTMLImageElement and ImageStyleValue) through notify_frame_advanced() returning the authoritative frame index. When a frame isn't in the pool, the last displayed frame is shown as a fallback (brief freeze rather than blank). Rename the old AnimatedBitmapDecodedImageData (which now only handles static/single-frame images) to BitmapDecodedImageData.
101 lines
3.2 KiB
C++
101 lines
3.2 KiB
C++
/*
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* Copyright (c) 2026, 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 <AK/Array.h>
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#include <AK/HashMap.h>
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#include <LibGC/Ptr.h>
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#include <LibGfx/ColorSpace.h>
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#include <LibGfx/Forward.h>
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#include <LibWeb/HTML/DecodedImageData.h>
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namespace Web::HTML {
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class AnimatedDecodedImageData final : public DecodedImageData {
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GC_CELL(AnimatedDecodedImageData, DecodedImageData);
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GC_DECLARE_ALLOCATOR(AnimatedDecodedImageData);
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public:
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static constexpr bool OVERRIDES_FINALIZE = true;
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static GC::Ref<AnimatedDecodedImageData> create(
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JS::Realm&,
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i64 session_id,
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u32 frame_count,
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u32 loop_count,
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Gfx::IntSize,
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Gfx::ColorSpace,
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Vector<u32> durations,
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Vector<NonnullRefPtr<Gfx::Bitmap>> initial_bitmaps);
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virtual ~AnimatedDecodedImageData() override;
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virtual void finalize() override;
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virtual RefPtr<Gfx::ImmutableBitmap> bitmap(size_t frame_index, Gfx::IntSize = {}) const override;
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virtual int frame_duration(size_t frame_index) const override;
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virtual size_t frame_count() const override { return m_frame_count; }
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virtual size_t loop_count() const override { return m_loop_count; }
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virtual bool is_animated() const override { return true; }
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virtual Optional<CSSPixels> intrinsic_width() const override;
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virtual Optional<CSSPixels> intrinsic_height() const override;
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virtual Optional<CSSPixelFraction> intrinsic_aspect_ratio() const override;
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virtual Optional<Gfx::IntRect> frame_rect(size_t frame_index) const override;
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virtual void paint(DisplayListRecordingContext&, size_t frame_index, Gfx::IntRect dst_rect, Gfx::IntRect clip_rect, Gfx::ScalingMode) const override;
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virtual size_t notify_frame_advanced(size_t caller_frame_index) override;
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void receive_frames(Vector<NonnullRefPtr<Gfx::Bitmap>>, u32 start_frame_index);
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i64 session_id() const { return m_session_id; }
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static void deliver_frames_for_session(i64 session_id, Vector<NonnullRefPtr<Gfx::Bitmap>>);
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static void install_frame_delivery_callback();
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private:
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static HashMap<i64, GC::RawPtr<AnimatedDecodedImageData>>& session_registry();
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static constexpr u32 BUFFER_POOL_SIZE = 8;
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static constexpr u32 REQUEST_BATCH_SIZE = 4;
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struct BufferSlot {
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Optional<u32> frame_index;
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RefPtr<Gfx::ImmutableBitmap> bitmap;
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u64 generation { 0 };
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};
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AnimatedDecodedImageData(
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i64 session_id,
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u32 frame_count,
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u32 loop_count,
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Gfx::IntSize,
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Gfx::ColorSpace,
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Vector<u32> durations);
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BufferSlot const* find_slot(u32 frame_index) const;
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BufferSlot& evict_oldest_slot();
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void maybe_request_more_frames(size_t current_frame_index);
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i64 m_session_id;
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u32 m_frame_count;
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u32 m_loop_count;
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Gfx::IntSize m_size;
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Gfx::ColorSpace m_color_space;
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Vector<u32> m_durations;
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Array<BufferSlot, BUFFER_POOL_SIZE> m_buffer_slots;
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mutable RefPtr<Gfx::ImmutableBitmap> m_last_displayed_bitmap;
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u64 m_write_generation { 0 };
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bool m_request_in_flight { false };
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u32 m_current_frame_index { 0 };
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u32 m_last_requested_start_frame { 0 };
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u32 m_highest_requested_frame { 0 };
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};
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}
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