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LibWeb: Use fixed-point saturated arithmetics for CSSPixels

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Using fixed-point saturated arithmetics for CSSPixels allows to avoid
accumulating floating-point errors.

This implementation is not complete yet: currently saturated
arithmetics implemented only for addition. But it is enough to not
regress any of layout tests we have :)

See https://github.com/SerenityOS/serenity/issues/18566
This commit is contained in:
Aliaksandr Kalenik 2023-07-23 01:09:39 +02:00 • committed by Andreas Kling
commit bec07d4af7
Notes: sideshowbarker 2024-07-17 05:13:53 +09:00
136 changed files with 1938 additions and 1844 deletions
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4
Userland/Libraries/LibWeb/Page/Page.cpp
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@ -94,8 +94,8 @@ CSSPixelPoint Page::device_to_css_point(DevicePixelPoint point) const
DevicePixelPoint Page::css_to_device_point(CSSPixelPoint point) const
{
return {
(point.x() * client().device_pixels_per_css_pixel()).to_int(),
(point.y() * client().device_pixels_per_css_pixel()).to_int(),
point.x() * client().device_pixels_per_css_pixel(),
point.y() * client().device_pixels_per_css_pixel(),
};
}