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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
Download patch file Download diff file Expand all files Collapse all files

13
Userland/Libraries/LibWeb/Painting/CommandList.cpp
View file

@ -96,7 +96,7 @@ void CommandList::execute(CommandExecutor& executor)
command.elision, command.wrapping, command.font);
},
[&](FillRect const& command) {
return executor.fill_rect(command.rect, command.color);
return executor.fill_rect(command.rect, command.color, command.clip_paths);
},
[&](DrawScaledBitmap const& command) {
return executor.draw_scaled_bitmap(command.dst_rect, command.bitmap, command.src_rect,
@ -104,7 +104,7 @@ void CommandList::execute(CommandExecutor& executor)
},
[&](DrawScaledImmutableBitmap const& command) {
return executor.draw_scaled_immutable_bitmap(command.dst_rect, command.bitmap, command.src_rect,
command.scaling_mode);
command.scaling_mode, command.clip_paths);
},
[&](SetClipRect const& command) {
return executor.set_clip_rect(command.rect);
@ -122,15 +122,15 @@ void CommandList::execute(CommandExecutor& executor)
return executor.pop_stacking_context();
},
[&](PaintLinearGradient const& command) {
return executor.paint_linear_gradient(command.gradient_rect, command.linear_gradient_data);
return executor.paint_linear_gradient(command.gradient_rect, command.linear_gradient_data, command.clip_paths);
},
[&](PaintRadialGradient const& command) {
return executor.paint_radial_gradient(command.rect, command.radial_gradient_data,
command.center, command.size);
command.center, command.size, command.clip_paths);
},
[&](PaintConicGradient const& command) {
return executor.paint_conic_gradient(command.rect, command.conic_gradient_data,
command.position);
command.position, command.clip_paths);
},
[&](PaintOuterBoxShadow const& command) {
return executor.paint_outer_box_shadow(command.outer_box_shadow_params);
@ -148,7 +148,8 @@ void CommandList::execute(CommandExecutor& executor)
command.top_left_radius,
command.top_right_radius,
command.bottom_left_radius,
command.bottom_right_radius);
command.bottom_right_radius,
command.clip_paths);
},
[&](FillPathUsingColor const& command) {
return executor.fill_path_using_color(command.path, command.color, command.winding_rule,