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LibWeb: Add CSSPixels::nearest_value_for(FloatingPoint)

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This is intended to annotate conversions from unknown floating-point
values to CSSPixels, and make it more obvious the fp value will be
rounded to the nearest fixed-point value.
This commit is contained in:
MacDue 2023-08-26 15:57:31 +01:00 • committed by Alexander Kalenik
parent 360c0eb509
commit 71baa8c31a
28 changed files with 120 additions and 112 deletions
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6
Userland/Libraries/LibWeb/Layout/Node.cpp
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@ -300,11 +300,11 @@ static CSSPixels snap_a_length_as_a_border_width(double device_pixels_per_css_pi
// 3. If len is greater than zero, but less than 1 device pixel, round len up to 1 device pixel.
if (device_pixels > 0 && device_pixels < 1)
return CSSPixels(1 / device_pixels_per_css_pixel);
return CSSPixels::nearest_value_for(1 / device_pixels_per_css_pixel);
// 4. If len is greater than 1 device pixel, round it down to the nearest integer number of device pixels.
if (device_pixels > 1)
return CSSPixels(floor(device_pixels) / device_pixels_per_css_pixel);
return CSSPixels::nearest_value_for(floor(device_pixels) / device_pixels_per_css_pixel);
return length;
}
@ -742,7 +742,7 @@ void NodeWithStyle::apply_style(const CSS::StyleProperties& computed_style)
// FIXME: Converting to pixels isn't really correct - values should be in "user units"
// https://svgwg.org/svg2-draft/coords.html#TermUserUnits
if (stroke_width->is_number())
computed_values.set_stroke_width(CSS::Length::make_px(CSSPixels(stroke_width->as_number().number())));
computed_values.set_stroke_width(CSS::Length::make_px(CSSPixels::nearest_value_for(stroke_width->as_number().number())));
else if (stroke_width->is_length())
computed_values.set_stroke_width(stroke_width->as_length().length());
else if (stroke_width->is_percentage())