fix: quad rendering including border only inside of the bounds #1843
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hecrj
requested changes
May 11, 2023
tiny_skia/src/backend.rs
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| // Make sure the border radius is not larger than the bounds | ||
| let border_width = border_width | ||
| .min(bounds.width / 2.0) | ||
| .min(bounds.height / 2.0); | ||
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| // Offset the fill by the border width | ||
| let path_bounds = Rectangle { | ||
| x: bounds.x + border_width, | ||
| y: bounds.y + border_width, | ||
| width: bounds.width - 2.0 * border_width, | ||
| height: bounds.height - 2.0 * border_width, | ||
| }; | ||
| // fill border radius is the border radius minus the border width | ||
| let mut fill_border_radius = *border_radius; | ||
| for radius in &mut fill_border_radius { | ||
| *radius = (*radius - border_width / 2.0) | ||
| .min(path_bounds.width / 2.0) | ||
| .min(path_bounds.height / 2.0); | ||
| } | ||
| let path = rounded_rectangle(path_bounds, fill_border_radius); |
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I'd expect the border to be rendered on top of the background like a border-box in CSS.
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Ok, so I guess that would mean not offsetting the fill rectangle?
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Hmm this might need some more testing. I'm going to mark it as a draft until i've tested it some more 😅. Specifically, if the border radius is smaller than half the border width, the path doesn't seem to work well. |
|
This seems to be working pretty well now. |
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It seems that border should not be drawn outside the quad bounds. For example, a slider handle with a large border radius will leave a trail of the border color when it is dragged, because it goes un-tracked in the damage.
This change also makes tiny-skia rendering of quads more consistent with the wgpu backend, which didn't seem to draw outside the bounds as far as i could tell with the same slider test.