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LibWeb+LibGfx: Use GPU backend for <canvas>

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This is implemented by using a GPU-accelerated surface for <canvas> when
a GPU context is available.

A side effect of this change is that all canvas modifications have to be
performed through Gfx::Painter, and whenever its content has to be
accessed, we need to take a snapshot of the corresponding GPU surface.

A new DrawPaintingSurface display list command is introduced to allow
cheap blitting of canvas content without having to read GPU surface
content into RAM.
This commit is contained in:
Aliaksandr Kalenik
2024-09-25 15:44:58 +02:00
committed by Alexander Kalenik
parent ab9ecbd79d
commit a7cbc7a6b8
20 changed files with 140 additions and 65 deletions
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9
Userland/Libraries/LibWeb/HTML/CanvasPattern.cpp
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@@ -127,10 +127,15 @@ WebIDL::ExceptionOr<JS::GCPtr<CanvasPattern>> CanvasPattern::create(JS::Realm& r
return WebIDL::SyntaxError::create(realm, "Repetition value is not valid"_string);
// Note: Bitmap won't be null here, as if it were it would have "bad" usability.
auto const& bitmap = *image.visit([](auto const& source) -> Gfx::Bitmap const* { return source->bitmap(); });
auto bitmap = image.visit(
[](JS::Handle<HTMLImageElement> const& source) -> RefPtr<Gfx::Bitmap> { return *source->bitmap(); },
[](JS::Handle<SVG::SVGImageElement> const& source) -> RefPtr<Gfx::Bitmap> { return *source->bitmap(); },
[](JS::Handle<HTMLCanvasElement> const& source) -> RefPtr<Gfx::Bitmap> { return source->surface()->create_snapshot(); },
[](JS::Handle<HTMLVideoElement> const& source) -> RefPtr<Gfx::Bitmap> { return *source->bitmap(); },
[](JS::Handle<ImageBitmap> const& source) -> RefPtr<Gfx::Bitmap> { return *source->bitmap(); });
// 6. Let pattern be a new CanvasPattern object with the image image and the repetition behavior given by repetition.
auto pattern = TRY_OR_THROW_OOM(realm.vm(), CanvasPatternPaintStyle::create(bitmap, *repetition_value));
auto pattern = TRY_OR_THROW_OOM(realm.vm(), CanvasPatternPaintStyle::create(*bitmap, *repetition_value));
// FIXME: 7. If image is not origin-clean, then mark pattern as not origin-clean.