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LibWeb: Support CSS property background-clip: text

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From https://drafts.csswg.org/css-backgrounds-4/#background-clip
"The background is painted within (clipped to) the intersection of the
border box and the geometry of the text in the element and its in-flow
and floated descendants"

This change implements it in the following way:
1. Traverse the descendants of the element, collecting the Gfx::Path of
   glyphs into a vector.
2. The vector of collected paths is saved in the background painting
   command.
3. The painting commands executor uses the list of glyphs to paint a
   mask for background clipping.

Co-authored-by: Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
This commit is contained in:
Zac Brannelly 2024-03-03 14:59:02 +11:00 • committed by Alexander Kalenik
parent 4a3680cafc
commit 9165faca5e
27 changed files with 353 additions and 105 deletions
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13
Userland/Libraries/LibWeb/Painting/CommandList.h
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@ -49,16 +49,16 @@ public:
virtual CommandResult draw_glyph_run(Vector<Gfx::DrawGlyphOrEmoji> const& glyph_run, Color const&, Gfx::FloatPoint translation, double scale) = 0;
virtual CommandResult draw_text(Gfx::IntRect const&, String const&, Gfx::TextAlignment alignment, Color const&, Gfx::TextElision, Gfx::TextWrapping, Optional<NonnullRefPtr<Gfx::Font>> const&) = 0;
virtual CommandResult fill_rect(Gfx::IntRect const&, Color const&) = 0;
virtual CommandResult fill_rect(Gfx::IntRect const&, Color const&, Vector<Gfx::Path> const& clip_paths) = 0;
virtual CommandResult draw_scaled_bitmap(Gfx::IntRect const& dst_rect, Gfx::Bitmap const& bitmap, Gfx::IntRect const& src_rect, Gfx::Painter::ScalingMode scaling_mode) = 0;
virtual CommandResult draw_scaled_immutable_bitmap(Gfx::IntRect const& dst_rect, Gfx::ImmutableBitmap const&, Gfx::IntRect const& src_rect, Gfx::Painter::ScalingMode scaling_mode) = 0;
virtual CommandResult draw_scaled_immutable_bitmap(Gfx::IntRect const& dst_rect, Gfx::ImmutableBitmap const&, Gfx::IntRect const& src_rect, Gfx::Painter::ScalingMode scaling_mode, Vector<Gfx::Path> const& clip_paths = {}) = 0;
virtual CommandResult set_clip_rect(Gfx::IntRect const& rect) = 0;
virtual CommandResult clear_clip_rect() = 0;
virtual CommandResult push_stacking_context(float opacity, bool is_fixed_position, Gfx::IntRect const& source_paintable_rect, Gfx::IntPoint post_transform_translation, CSS::ImageRendering image_rendering, StackingContextTransform transform, Optional<StackingContextMask> mask) = 0;
virtual CommandResult pop_stacking_context() = 0;
virtual CommandResult paint_linear_gradient(Gfx::IntRect const&, LinearGradientData const&) = 0;
virtual CommandResult paint_radial_gradient(Gfx::IntRect const& rect, RadialGradientData const&, Gfx::IntPoint const& center, Gfx::IntSize const& size) = 0;
virtual CommandResult paint_conic_gradient(Gfx::IntRect const& rect, ConicGradientData const&, Gfx::IntPoint const& position) = 0;
virtual CommandResult paint_linear_gradient(Gfx::IntRect const&, LinearGradientData const&, Vector<Gfx::Path> const& clip_paths = {}) = 0;
virtual CommandResult paint_radial_gradient(Gfx::IntRect const& rect, RadialGradientData const&, Gfx::IntPoint const& center, Gfx::IntSize const& size, Vector<Gfx::Path> const& clip_paths = {}) = 0;
virtual CommandResult paint_conic_gradient(Gfx::IntRect const& rect, ConicGradientData const&, Gfx::IntPoint const& position, Vector<Gfx::Path> const& clip_paths = {}) = 0;
virtual CommandResult paint_outer_box_shadow(PaintOuterBoxShadowParams const&) = 0;
virtual CommandResult paint_inner_box_shadow(PaintOuterBoxShadowParams const&) = 0;
virtual CommandResult paint_text_shadow(int blur_radius, Gfx::IntRect const& shadow_bounding_rect, Gfx::IntRect const& text_rect, Span<Gfx::DrawGlyphOrEmoji const>, Color const&, int fragment_baseline, Gfx::IntPoint const& draw_location) = 0;
@ -66,7 +66,8 @@ public:
Gfx::AntiAliasingPainter::CornerRadius const& top_left_radius,
Gfx::AntiAliasingPainter::CornerRadius const& top_right_radius,
Gfx::AntiAliasingPainter::CornerRadius const& bottom_left_radius,
Gfx::AntiAliasingPainter::CornerRadius const& bottom_right_radius)
Gfx::AntiAliasingPainter::CornerRadius const& bottom_right_radius,
Vector<Gfx::Path> const& clip_paths = {})
= 0;
virtual CommandResult fill_path_using_color(Gfx::Path const&, Color const& color, Gfx::Painter::WindingRule, Gfx::FloatPoint const& aa_translation) = 0;
virtual CommandResult fill_path_using_paint_style(Gfx::Path const&, Gfx::PaintStyle const& paint_style, Gfx::Painter::WindingRule winding_rule, float opacity, Gfx::FloatPoint const& aa_translation) = 0;