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Add RectShape::blur_width to implement shadows (#4267)

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This is mostly a refactor, but has some performance benefits:
* We (re)use the same tessellator as for everything else, leading to
less allocations
* We cull shapes before rendering them

Adding `RectShape::blur_width` means it can also be used for other
effects, such as glow.
This commit is contained in:
Emil Ernerfeldt
2024-03-29 20:29:42 +01:00
committed by GitHub
parent 73dbfd689b
commit a541e021aa
7 changed files with 62 additions and 51 deletions
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26
crates/epaint/src/shape.rs
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@@ -668,6 +668,14 @@ pub struct RectShape {
/// The thickness and color of the outline.
pub stroke: Stroke,
/// If larger than zero, the edges of the rectangle
/// (for both fill and stroke) will be blurred.
///
/// This can be used to produce shadows and glow effects.
///
/// The blur is currently implemented using a simple linear blur in sRGBA gamma space.
pub blur_width: f32,
/// If the rect should be filled with a texture, which one?
///
/// The texture is multiplied with [`Self::fill`].
@@ -695,6 +703,7 @@ impl RectShape {
rounding: rounding.into(),
fill: fill_color.into(),
stroke: stroke.into(),
blur_width: 0.0,
fill_texture_id: Default::default(),
uv: Rect::ZERO,
}
@@ -711,6 +720,7 @@ impl RectShape {
rounding: rounding.into(),
fill: fill_color.into(),
stroke: Default::default(),
blur_width: 0.0,
fill_texture_id: Default::default(),
uv: Rect::ZERO,
}
@@ -723,18 +733,32 @@ impl RectShape {
rounding: rounding.into(),
fill: Default::default(),
stroke: stroke.into(),
blur_width: 0.0,
fill_texture_id: Default::default(),
uv: Rect::ZERO,
}
}
/// If larger than zero, the edges of the rectangle
/// (for both fill and stroke) will be blurred.
///
/// This can be used to produce shadows and glow effects.
///
/// The blur is currently implemented using a simple linear blur in `sRGBA` gamma space.
#[inline]
pub fn with_blur_width(mut self, blur_width: f32) -> Self {
self.blur_width = blur_width;
self
}
/// The visual bounding rectangle (includes stroke width)
#[inline]
pub fn visual_bounding_rect(&self) -> Rect {
if self.fill == Color32::TRANSPARENT && self.stroke.is_empty() {
Rect::NOTHING
} else {
self.rect.expand(self.stroke.width / 2.0)
self.rect
.expand((self.stroke.width + self.blur_width) / 2.0)
}
}
}