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LibWeb: Fix painting of paths with storke-width=0 in Skia painter

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From SkPaint.h:
"Sets the thickness of the pen used by the paint to outline the shape.
A stroke-width of zero is treated as "hairline" width. Hairlines are
always exactly one pixel wide in device space (their thickness does not
change as the canvas is scaled)."

While we expect stroke-width=0 to simply not be painted.
This commit is contained in:
Aliaksandr Kalenik 2024-07-01 17:27:22 +02:00 committed by Alexander Kalenik
parent 877adcc021
commit bce7b24cfb
Notes: sideshowbarker 2024-07-17 01:06:10 +09:00 
Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/LadybirdBrowser/ladybird/commit/bce7b24cfb
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/329
1 changed files with 16 additions and 0 deletions
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16
Userland/Libraries/LibWeb/Painting/DisplayListPlayerSkia.cpp
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@ -698,6 +698,10 @@ CommandResult DisplayListPlayerSkia::fill_path_using_paint_style(FillPathUsingPa
CommandResult DisplayListPlayerSkia::stroke_path_using_color(StrokePathUsingColor const& command)
{
// Skia treats zero thickness as a special case and will draw a hairline, while we want to draw nothing.
if (!command.thickness)
return CommandResult::Continue;
auto& canvas = surface().canvas();
SkPaint paint;
paint.setAntiAlias(true);
@ -712,6 +716,10 @@ CommandResult DisplayListPlayerSkia::stroke_path_using_color(StrokePathUsingColo
CommandResult DisplayListPlayerSkia::stroke_path_using_paint_style(StrokePathUsingPaintStyle const& command)
{
// Skia treats zero thickness as a special case and will draw a hairline, while we want to draw nothing.
if (!command.thickness)
return CommandResult::Continue;
auto path = to_skia_path(command.path);
path.offset(command.aa_translation.x(), command.aa_translation.y());
auto paint = paint_style_to_skia_paint(*command.paint_style, command.bounding_rect().to_type<float>());
@ -725,6 +733,10 @@ CommandResult DisplayListPlayerSkia::stroke_path_using_paint_style(StrokePathUsi
CommandResult DisplayListPlayerSkia::draw_ellipse(DrawEllipse const& command)
{
// Skia treats zero thickness as a special case and will draw a hairline, while we want to draw nothing.
if (!command.thickness)
return CommandResult::Continue;
auto const& rect = command.rect;
auto& canvas = surface().canvas();
SkPaint paint;
@ -749,6 +761,10 @@ CommandResult DisplayListPlayerSkia::fill_ellipse(FillEllipse const& command)
CommandResult DisplayListPlayerSkia::draw_line(DrawLine const& command)
{
// Skia treats zero thickness as a special case and will draw a hairline, while we want to draw nothing.
if (!command.thickness)
return CommandResult::Continue;
auto from = SkPoint::Make(command.from.x(), command.from.y());
auto to = SkPoint::Make(command.to.x(), command.to.y());
auto& canvas = surface().canvas();