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LibWeb: Resolve and paint simple SVG masks

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This allows applying SVG <mask>s to elements. It is only implemented for
the simplest (and default) case:

	- mask-type = luminance
 	- maskContentUnits = maskContentUnits
 	- maskUnits = objectBoundingBox
	- Default masking area

It should be possible to extend to cover more cases. Though the layout
for maskContentUnits = objectBoundingBox will be tricky to figure out.
This commit is contained in:
MacDue 2023-09-10 14:10:55 +01:00 • committed by Andreas Kling
parent 650180811e
commit 909bcfe9a4
12 changed files with 123 additions and 17 deletions
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23
Userland/Libraries/LibWeb/Painting/StackingContext.cpp
View file

@ -19,8 +19,10 @@
#include <LibWeb/Layout/ReplacedBox.h>
#include <LibWeb/Layout/Viewport.h>
#include <LibWeb/Painting/PaintableBox.h>
#include <LibWeb/Painting/SVGPaintable.h>
#include <LibWeb/Painting/StackingContext.h>
#include <LibWeb/Painting/TableBordersPainting.h>
#include <LibWeb/SVG/SVGMaskElement.h>
namespace Web::Painting {
@ -435,6 +437,27 @@ void StackingContext::paint(PaintContext& context) const
if (opacity == 0.0f)
return;
if (auto masking_area = paintable_box().get_masking_area(); masking_area.has_value()) {
// TODO: Support masks and CSS transforms at the same time.
// Note: Currently only SVG masking is implemented (which does not use CSS transforms anyway).
if (masking_area->is_empty())
return;
auto paint_rect = context.enclosing_device_rect(*masking_area);
auto bitmap_or_error = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, paint_rect.size().to_type<int>());
if (bitmap_or_error.is_error())
return;
auto bitmap = bitmap_or_error.release_value();
{
Gfx::Painter painter(bitmap);
painter.translate(-paint_rect.location().to_type<int>());
auto paint_context = context.clone(painter);
paint_internal(paint_context);
}
paintable_box().apply_mask(context, bitmap, *masking_area);
context.painter().blit(paint_rect.location().to_type<int>(), *bitmap, bitmap->rect(), opacity);
return;
}
auto affine_transform = affine_transform_matrix();
auto translation = context.rounded_device_point(affine_transform.translation().to_type<CSSPixels>()).to_type<int>().to_type<float>();
affine_transform.set_translation(translation);