mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-04-27 18:17:22 +02:00
90a211bf47
Stop converting between CSS and device pixels as part of rendering - the display list should be as simple as possible, so convert to DevicePixels once when constructing the display list.
120 lines
4.7 KiB
C++
120 lines
4.7 KiB
C++
/*
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* Copyright (c) 2024-2026, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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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/SVGClipBox.h>
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#include <LibWeb/Layout/SVGMaskBox.h>
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#include <LibWeb/Painting/SVGClipPaintable.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/SVGSVGElement.h>
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namespace Web::Painting {
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template<typename T>
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static T const* first_child_layout_node_of_type(SVG::SVGGraphicsElement const& graphics_element)
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{
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if (!graphics_element.layout_node())
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return nullptr;
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return graphics_element.layout_node()->first_child_of_type<T>();
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}
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static auto get_mask_box(SVG::SVGGraphicsElement const& graphics_element)
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{
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return first_child_layout_node_of_type<Layout::SVGMaskBox>(graphics_element);
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}
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static auto get_clip_box(SVG::SVGGraphicsElement const& graphics_element)
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{
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return first_child_layout_node_of_type<Layout::SVGClipBox>(graphics_element);
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}
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Optional<CSSPixelRect> SVGMaskable::get_svg_mask_area() const
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{
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auto const& graphics_element = as<SVG::SVGGraphicsElement const>(*dom_node_of_svg());
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if (auto* mask_box = get_mask_box(graphics_element))
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return mask_box->dom_node().resolve_masking_area(mask_box->paintable_box()->absolute_border_box_rect());
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return {};
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}
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Optional<CSSPixelRect> SVGMaskable::get_svg_clip_area() const
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{
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auto const& graphics_element = as<SVG::SVGGraphicsElement const>(*dom_node_of_svg());
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if (auto* clip_box = get_clip_box(graphics_element))
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return clip_box->paintable_box()->absolute_border_box_rect();
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return {};
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}
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static Gfx::MaskKind mask_type_to_gfx_mask_kind(CSS::MaskType mask_type)
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{
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switch (mask_type) {
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case CSS::MaskType::Alpha:
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return Gfx::MaskKind::Alpha;
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case CSS::MaskType::Luminance:
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return Gfx::MaskKind::Luminance;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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Optional<Gfx::MaskKind> SVGMaskable::get_svg_mask_type() const
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{
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auto const& graphics_element = as<SVG::SVGGraphicsElement const>(*dom_node_of_svg());
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if (auto* mask_box = get_mask_box(graphics_element))
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return mask_type_to_gfx_mask_kind(mask_box->computed_values().mask_type());
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return {};
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}
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static RefPtr<DisplayList> paint_mask_or_clip_to_display_list(
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DisplayListRecordingContext& context,
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Gfx::AffineTransform const& target_svg_transform,
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PaintableBox const& paintable,
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CSSPixelRect const& area,
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bool is_clip_path)
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{
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auto mask_rect = context.enclosing_device_rect(area);
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auto display_list = DisplayList::create();
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DisplayListRecorder display_list_recorder(*display_list);
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display_list_recorder.translate(-mask_rect.location().to_type<int>());
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auto paint_context = context.clone(display_list_recorder);
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auto const& mask_element = as<SVG::SVGGraphicsElement const>(*paintable.dom_node());
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// Layout computes transforms only within the mask/clip subtree, so prepend the target's accumulated transform here.
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auto svg_transform = Gfx::AffineTransform { target_svg_transform }.multiply(mask_element.element_transform());
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paint_context.set_svg_transform(svg_transform);
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paint_context.set_draw_svg_geometry_for_clip_path(is_clip_path);
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StackingContext::paint_svg(paint_context, paintable, PaintPhase::Foreground);
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return display_list;
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}
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Gfx::AffineTransform SVGMaskable::target_svg_transform() const
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{
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// Only SVGGraphicsPaintable carries an SVG transform; other targets (e.g. foreign objects) use identity.
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if (auto const* svg_graphics_paintable = as_if<SVGGraphicsPaintable>(*this))
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return svg_graphics_paintable->computed_transforms().svg_transform();
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return {};
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}
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RefPtr<DisplayList> SVGMaskable::calculate_svg_mask_display_list(DisplayListRecordingContext& context, CSSPixelRect const& mask_area) const
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{
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auto const& graphics_element = as<SVG::SVGGraphicsElement const>(*dom_node_of_svg());
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auto* mask_box = get_mask_box(graphics_element);
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if (!mask_box)
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return nullptr;
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auto& mask_paintable = static_cast<PaintableBox const&>(*mask_box->first_paintable());
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return paint_mask_or_clip_to_display_list(context, target_svg_transform(), mask_paintable, mask_area, false);
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}
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RefPtr<DisplayList> SVGMaskable::calculate_svg_clip_display_list(DisplayListRecordingContext& context, CSSPixelRect const& clip_area) const
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{
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auto const& graphics_element = as<SVG::SVGGraphicsElement const>(*dom_node_of_svg());
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auto* clip_box = get_clip_box(graphics_element);
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if (!clip_box)
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return nullptr;
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auto& clip_paintable = static_cast<PaintableBox const&>(*clip_box->first_paintable());
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return paint_mask_or_clip_to_display_list(context, target_svg_transform(), clip_paintable, clip_area, true);
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}
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}
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