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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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16
Userland/Libraries/LibWeb/Painting/RecordingPainter.h
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@ -44,7 +44,7 @@ class RecordingPainter {
AK_MAKE_NONMOVABLE(RecordingPainter);
public:
void fill_rect(Gfx::IntRect const& rect, Color color);
void fill_rect(Gfx::IntRect const& rect, Color color, Vector<Gfx::Path> const& clip_paths = {});
struct FillPathUsingColorParams {
Gfx::Path path;
@ -84,14 +84,14 @@ public:
void fill_ellipse(Gfx::IntRect const& a_rect, Color color, Gfx::AntiAliasingPainter::BlendMode blend_mode = Gfx::AntiAliasingPainter::BlendMode::Normal);
void fill_rect_with_linear_gradient(Gfx::IntRect const& gradient_rect, LinearGradientData const& data);
void fill_rect_with_conic_gradient(Gfx::IntRect const& rect, ConicGradientData const& data, Gfx::IntPoint const& position);
void fill_rect_with_radial_gradient(Gfx::IntRect const& rect, RadialGradientData const& data, Gfx::IntPoint center, Gfx::IntSize size);
void fill_rect_with_linear_gradient(Gfx::IntRect const& gradient_rect, LinearGradientData const& data, Vector<Gfx::Path> const& clip_paths = {});
void fill_rect_with_conic_gradient(Gfx::IntRect const& rect, ConicGradientData const& data, Gfx::IntPoint const& position, Vector<Gfx::Path> const& clip_paths = {});
void fill_rect_with_radial_gradient(Gfx::IntRect const& rect, RadialGradientData const& data, Gfx::IntPoint center, Gfx::IntSize size, Vector<Gfx::Path> const& clip_paths = {});
void draw_rect(Gfx::IntRect const& rect, Color color, bool rough = false);
void draw_scaled_bitmap(Gfx::IntRect const& dst_rect, Gfx::Bitmap const& bitmap, Gfx::IntRect const& src_rect, Gfx::Painter::ScalingMode scaling_mode = Gfx::Painter::ScalingMode::NearestNeighbor);
void draw_scaled_immutable_bitmap(Gfx::IntRect const& dst_rect, Gfx::ImmutableBitmap const& bitmap, Gfx::IntRect const& src_rect, Gfx::Painter::ScalingMode scaling_mode = Gfx::Painter::ScalingMode::NearestNeighbor);
void draw_scaled_immutable_bitmap(Gfx::IntRect const& dst_rect, Gfx::ImmutableBitmap const& bitmap, Gfx::IntRect const& src_rect, Gfx::Painter::ScalingMode scaling_mode = Gfx::Painter::ScalingMode::NearestNeighbor, Vector<Gfx::Path> const& clip_paths = {});
void draw_line(Gfx::IntPoint from, Gfx::IntPoint to, Color color, int thickness = 1, Gfx::Painter::LineStyle style = Gfx::Painter::LineStyle::Solid, Color alternate_color = Color::Transparent);
@ -137,9 +137,9 @@ public:
void paint_inner_box_shadow_params(PaintOuterBoxShadowParams params);
void paint_text_shadow(int blur_radius, Gfx::IntRect bounding_rect, Gfx::IntRect text_rect, Span<Gfx::DrawGlyphOrEmoji const> glyph_run, Color color, int fragment_baseline, Gfx::IntPoint draw_location);
void fill_rect_with_rounded_corners(Gfx::IntRect const& rect, Color color, Gfx::AntiAliasingPainter::CornerRadius top_left_radius, Gfx::AntiAliasingPainter::CornerRadius top_right_radius, Gfx::AntiAliasingPainter::CornerRadius bottom_right_radius, Gfx::AntiAliasingPainter::CornerRadius bottom_left_radius);
void fill_rect_with_rounded_corners(Gfx::IntRect const& a_rect, Color color, int radius);
void fill_rect_with_rounded_corners(Gfx::IntRect const& a_rect, Color color, int top_left_radius, int top_right_radius, int bottom_right_radius, int bottom_left_radius);
void fill_rect_with_rounded_corners(Gfx::IntRect const& rect, Color color, Gfx::AntiAliasingPainter::CornerRadius top_left_radius, Gfx::AntiAliasingPainter::CornerRadius top_right_radius, Gfx::AntiAliasingPainter::CornerRadius bottom_right_radius, Gfx::AntiAliasingPainter::CornerRadius bottom_left_radius, Vector<Gfx::Path> const& clip_paths = {});
void fill_rect_with_rounded_corners(Gfx::IntRect const& a_rect, Color color, int radius, Vector<Gfx::Path> const& clip_paths = {});
void fill_rect_with_rounded_corners(Gfx::IntRect const& a_rect, Color color, int top_left_radius, int top_right_radius, int bottom_right_radius, int bottom_left_radius, Vector<Gfx::Path> const& clip_paths = {});
void draw_triangle_wave(Gfx::IntPoint a_p1, Gfx::IntPoint a_p2, Color color, int amplitude, int thickness);