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LibWeb: Make CSSPixels and Length use 64-bit (double) floating point

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This fixes a plethora of rounding problems on many websites.
In the future, we may want to replace this with fixed-point arithmetic
(bug #18566) for performance (and consistency with other engines),
but in the meantime this makes the web look a bit better. :^)

There's a lot more things that could be converted to doubles, which
would reduce the amount of casting necessary in this patch.
We can do that incrementally, however.
This commit is contained in:
Andreas Kling 2023-05-24 10:50:57 +02:00
parent 30262d7023
commit 655d9d1462
80 changed files with 298 additions and 299 deletions
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10
Userland/Libraries/LibWeb/Painting/BorderPainting.cpp
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@ -33,14 +33,14 @@ BorderRadiiData normalized_border_radii_data(Layout::Node const& node, CSSPixelR
// Scale overlapping curves according to https://www.w3.org/TR/css-backgrounds-3/#corner-overlap
CSSPixels f = 1.0f;
auto width_reciprocal = 1.0f / rect.width().value();
auto height_reciprocal = 1.0f / rect.height().value();
auto width_reciprocal = 1.0 / rect.width().value();
auto height_reciprocal = 1.0 / rect.height().value();
f = max(f, width_reciprocal * (top_left_radius_px.horizontal_radius + top_right_radius_px.horizontal_radius));
f = max(f, height_reciprocal * (top_right_radius_px.vertical_radius + bottom_right_radius_px.vertical_radius));
f = max(f, width_reciprocal * (bottom_left_radius_px.horizontal_radius + bottom_right_radius_px.horizontal_radius));
f = max(f, height_reciprocal * (top_left_radius_px.vertical_radius + bottom_left_radius_px.vertical_radius));
f = 1.0f / f.value();
f = 1.0 / f.value();
top_left_radius_px.horizontal_radius *= f;
top_left_radius_px.vertical_radius *= f;
@ -149,8 +149,8 @@ void paint_border(PaintContext& context, BorderEdge edge, DevicePixelRect const&
auto draw_border = [&](auto const& border, auto const& radius, auto const& opposite_border, auto const& opposite_radius, auto p1_step_translate, auto p2_step_translate) {
auto [p1, p2] = points_for_edge(edge, rect);
auto p1_step = radius ? 0 : border.width / static_cast<float>(device_pixel_width.value());
auto p2_step = opposite_radius ? 0 : opposite_border.width / static_cast<float>(device_pixel_width.value());
auto p1_step = radius ? 0 : border.width / device_pixel_width.value();
auto p2_step = opposite_radius ? 0 : opposite_border.width / device_pixel_width.value();
for (DevicePixels i = 0; i < device_pixel_width; ++i) {
draw_horizontal_or_vertical_line(p1, p2);
p1_step_translate(p1, p1_step);