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Restore source compatibility for drop-shadow-blur

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Let's keep source compatibility and define `drop-shadow-blur` to be a radius.
The CSS spec says that the standard deviation is half of the radius.

We just need to scale again and increase the shadow rect to make sure that no borders are visible.
This commit is contained in:
Simon Hausmann 2021-05-20 12:14:05 +02:00
parent a41f56ff8e
commit a7ce64657c
8 changed files with 14 additions and 28 deletions
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10
sixtyfps_runtime/rendering_backends/gl/lib.rs
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@ -1011,7 +1011,7 @@ impl ItemRenderer for GLItemRenderer {
.shared_data
.load_item_graphics_cache_with_function(&box_shadow.cached_rendering_data, || {
ItemGraphicsCacheEntry::Image({
let blur = box_shadow.blur();
let blur = box_shadow.blur() * self.scale_factor;
let offset_x = box_shadow.offset_x() * self.scale_factor;
let offset_y = box_shadow.offset_y() * self.scale_factor;
let width = box_shadow.width() * self.scale_factor;
@ -1019,10 +1019,10 @@ impl ItemRenderer for GLItemRenderer {
let radius = box_shadow.border_radius() * self.scale_factor;
let shadow_rect: euclid::Rect<f32, euclid::UnknownUnit> = euclid::rect(
offset_x - blur / 2.,
offset_y - blur / 2.,
width + blur,
height + blur,
offset_x - blur,
offset_y - blur,
width + 2. * blur,
height + 2. * blur,
);
let shadow_image_width = shadow_rect.max_x().ceil() as usize;