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LibWeb: Account text and image storage as external memory

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Report DOM character data, decoded image frames, ImageBitmap pixel
buffers, and 2D canvas surfaces through the GC external memory hook.
This lets image and text-heavy pages participate in GC threshold
calculations through their retained backing storage.
This commit is contained in:
Andreas Kling
2026-05-06 00:34:52 +02:00
committed by Andreas Kling
parent 68fa684f76
commit a414136d7c
Notes: github-actions[bot] 2026-05-07 08:04:42 +00:00 
Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/a414136d7ce
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/9286
10 changed files with 67 additions and 0 deletions
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12
Libraries/LibWeb/HTML/BitmapDecodedImageData.cpp
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@@ -5,6 +5,8 @@
*/
#include <LibGC/Heap.h>
#include <LibGfx/Bitmap.h>
#include <LibJS/Runtime/ExternalMemory.h>
#include <LibJS/Runtime/Realm.h>
#include <LibWeb/HTML/BitmapDecodedImageData.h>
#include <LibWeb/Painting/DisplayListRecorder.h>
@@ -28,6 +30,16 @@ BitmapDecodedImageData::BitmapDecodedImageData(Vector<Frame>&& frames, size_t lo
BitmapDecodedImageData::~BitmapDecodedImageData() = default;
size_t BitmapDecodedImageData::external_memory_size() const
{
size_t size = JS::vector_external_memory_size(m_frames);
for (auto const& frame : m_frames) {
if (frame.frame)
size = JS::saturating_add_external_memory_size(size, frame.frame->bitmap().data_size());
}
return size;
}
RefPtr<Gfx::DecodedImageFrame> BitmapDecodedImageData::frame(size_t frame_index, Gfx::IntSize) const
{
if (frame_index >= m_frames.size())