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LibWeb: Use Gfx::AntiAliasingPainter to draw SVG paths

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This is still quite bad, but it's much more pleasing to look at when
drawing random SVGs :^)
This commit is contained in:
Ali Mohammad Pur 2021-09-17 12:03:24 +04:30 • committed by Ali Mohammad Pur
parent e2cd558101
commit 5a2e7d30ce
4 changed files with 42 additions and 8 deletions
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25
Userland/Libraries/LibGfx/AntiAliasingPainter.cpp
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@ -16,7 +16,8 @@ static float fractional_part(float x)
// Base algorithm from https://en.wikipedia.org/wiki/Xiaolin_Wu%27s_line_algorithm,
// because there seems to be no other known method for drawing AA'd lines (?)
void Gfx::AntiAliasingPainter::draw_line(FloatPoint const& actual_from, FloatPoint const& actual_to, Color color, float thickness, Gfx::Painter::LineStyle style, Color)
template<Gfx::AntiAliasingPainter::AntiAliasPolicy policy>
void Gfx::AntiAliasingPainter::draw_anti_aliased_line(FloatPoint const& actual_from, FloatPoint const& actual_to, Color color, float thickness, Gfx::Painter::LineStyle style, Color)
{
// FIXME: Implement this :P
VERIFY(style == Painter::LineStyle::Solid);
@ -76,10 +77,18 @@ void Gfx::AntiAliasingPainter::draw_line(FloatPoint const& actual_from, FloatPoi
auto x = first_end_point.x();
while (x < last_end_point.x()) {
if (is_steep) {
draw_point({ floorf(next_intersection), x }, color_with_alpha(1 - fractional_part(next_intersection)));
if constexpr (policy == AntiAliasPolicy::OnlyEnds) {
draw_point({ floorf(next_intersection), x }, color);
} else {
draw_point({ floorf(next_intersection), x }, color_with_alpha(1 - fractional_part(next_intersection)));
}
draw_point({ floorf(next_intersection) + 1, x }, color_with_alpha(fractional_part(next_intersection)));
} else {
draw_point({ x, floorf(next_intersection) }, color_with_alpha(1 - fractional_part(next_intersection)));
if constexpr (policy == AntiAliasPolicy::OnlyEnds) {
draw_point({ x, floorf(next_intersection) }, color);
} else {
draw_point({ x, floorf(next_intersection) }, color_with_alpha(1 - fractional_part(next_intersection)));
}
draw_point({ x, floorf(next_intersection) + 1 }, color_with_alpha(fractional_part(next_intersection)));
}
next_intersection += delta_y;
@ -87,6 +96,16 @@ void Gfx::AntiAliasingPainter::draw_line(FloatPoint const& actual_from, FloatPoi
}
}
void Gfx::AntiAliasingPainter::draw_aliased_line(FloatPoint const& actual_from, FloatPoint const& actual_to, Color color, float thickness, Gfx::Painter::LineStyle style, Color alternate_color)
{
draw_anti_aliased_line<AntiAliasPolicy::OnlyEnds>(actual_from, actual_to, color, thickness, style, alternate_color);
}
void Gfx::AntiAliasingPainter::draw_line(FloatPoint const& actual_from, FloatPoint const& actual_to, Color color, float thickness, Gfx::Painter::LineStyle style, Color alternate_color)
{
draw_anti_aliased_line<AntiAliasPolicy::Full>(actual_from, actual_to, color, thickness, style, alternate_color);
}
void Gfx::AntiAliasingPainter::fill_path(Path& path, Color color, Painter::WindingRule rule)
{
Detail::fill_path<Detail::FillPathMode::AllowFloatingPoints>(*this, path, color, rule);