Andreas Kling 97986f9739 LibWeb: Stream animated image frames on demand ...

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.

2026-02-13 18:34:24 +01:00

7.5 KiB

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