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LibWeb: Share decoded images at the Resource level :^)

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This patch adds ImageResource as a subclass of Resource. This new class
also keeps a Gfx::ImageDecoder so that we can share decoded bitmaps
between all clients of an image resource inside LibWeb.

With this, we now share both encoded and decoded data for images. :^)

I had to change how the purgeable-volatile flag is updated to keep the
volatile-images-outside-the-visible-viewport optimization working.
HTMLImageElement now inherits from ImageResourceClient (a subclass of
ResourceClient with additional image-specific stuff) and informs its
ImageResource about whether it's inside the viewport or outside.

This is pretty awesome! :^)
This commit is contained in:
Andreas Kling 2020-06-02 20:27:26 +02:00
parent 1c6e4e04a8
commit d4ddb0013c
14 changed files with 200 additions and 30 deletions
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2
Libraries/LibWeb/Layout/LayoutDocument.cpp
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@ -63,7 +63,7 @@ void LayoutDocument::did_set_viewport_rect(Badge<Frame>, const Gfx::Rect& a_view
{
Gfx::FloatRect viewport_rect(a_viewport_rect.x(), a_viewport_rect.y(), a_viewport_rect.width(), a_viewport_rect.height());
for_each_in_subtree_of_type<LayoutImage>([&](auto& layout_image) {
const_cast<HTMLImageElement&>(layout_image.node()).set_volatile({}, !viewport_rect.intersects(layout_image.rect()));
const_cast<HTMLImageElement&>(layout_image.node()).set_visible_in_viewport({}, viewport_rect.intersects(layout_image.rect()));
return IterationDecision::Continue;
});
}