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https://github.com/RGBCube/serenity
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909bcfe9a4
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.
74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
/*
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* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/Layout/ImageBox.h>
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#include <LibWeb/Painting/SVGGraphicsPaintable.h>
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#include <LibWeb/Painting/StackingContext.h>
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#include <LibWeb/SVG/SVGMaskElement.h>
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namespace Web::Painting {
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JS::NonnullGCPtr<SVGGraphicsPaintable> SVGGraphicsPaintable::create(Layout::SVGGraphicsBox const& layout_box)
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{
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return layout_box.heap().allocate_without_realm<SVGGraphicsPaintable>(layout_box);
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}
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SVGGraphicsPaintable::SVGGraphicsPaintable(Layout::SVGGraphicsBox const& layout_box)
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: SVGPaintable(layout_box)
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{
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}
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bool SVGGraphicsPaintable::forms_unconnected_subtree() const
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{
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// Masks should not be painted (i.e. reachable) unless referenced by another element.
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return is<SVG::SVGMaskElement>(dom_node());
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}
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Layout::SVGGraphicsBox const& SVGGraphicsPaintable::layout_box() const
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{
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return static_cast<Layout::SVGGraphicsBox const&>(layout_node());
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}
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Optional<CSSPixelRect> SVGGraphicsPaintable::get_masking_area() const
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{
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auto const& graphics_element = verify_cast<SVG::SVGGraphicsElement const>(*dom_node());
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if (auto mask = graphics_element.mask())
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return mask->resolve_masking_area(absolute_border_box_rect());
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return {};
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}
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void SVGGraphicsPaintable::apply_mask(PaintContext& context, Gfx::Bitmap& target, CSSPixelRect const& masking_area) const
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{
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auto const& graphics_element = verify_cast<SVG::SVGGraphicsElement const>(*dom_node());
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auto mask = graphics_element.mask();
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VERIFY(mask);
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if (mask->mask_content_units() != SVG::MaskContentUnits::UserSpaceOnUse) {
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dbgln("SVG: maskContentUnits=objectBoundingBox is not supported");
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return;
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}
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auto mask_rect = context.enclosing_device_rect(masking_area);
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RefPtr<Gfx::Bitmap> mask_bitmap = {};
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if (mask && mask->layout_node() && is<PaintableBox>(mask->layout_node()->paintable())) {
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auto& mask_paintable = static_cast<PaintableBox const&>(*mask->layout_node()->paintable());
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auto mask_bitmap_or_error = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, mask_rect.size().to_type<int>());
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if (mask_bitmap_or_error.is_error())
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return;
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mask_bitmap = mask_bitmap_or_error.release_value();
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{
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Gfx::Painter painter(*mask_bitmap);
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painter.translate(-mask_rect.location().to_type<int>());
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auto paint_context = context.clone(painter);
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paint_context.set_svg_transform(graphics_element.get_transform());
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StackingContext::paint_node_as_stacking_context(mask_paintable, paint_context);
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}
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}
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// TODO: Follow mask-type attribute to select between alpha/luminance masks.
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if (mask_bitmap)
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target.apply_mask(*mask_bitmap, Gfx::Bitmap::MaskKind::Luminance);
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return;
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}
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}
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