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Fix integer overflow with nested clip primitives

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This commit is contained in:
Héctor Ramón Jiménez 2019-11-06 21:00:24 +01:00
parent efa8d267b8
commit 8074bca8a0
1 changed files with 22 additions and 15 deletions
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37
wgpu/src/renderer.rs
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@ -254,24 +254,31 @@ impl Renderer {
offset,
content,
} => {
let clip_layer = Layer::new(
Rectangle {
x: bounds.x as u32 - layer.offset.x,
y: bounds.y as u32 - layer.offset.y,
width: bounds.width as u32,
height: bounds.height as u32,
},
layer.offset + *offset,
);
let x = bounds.x - layer.offset.x as f32;
let y = bounds.y - layer.offset.y as f32;
let width = (bounds.width + x).min(bounds.width);
let height = (bounds.height + y).min(bounds.height);
let new_layer = Layer::new(layer.bounds, layer.offset);
// Only draw visible content on-screen
// TODO: Also, check for parent layer bounds to avoid further
// drawing in some circumstances.
if width > 0.0 && height > 0.0 {
let clip_layer = Layer::new(
Rectangle {
x: x.max(0.0).ceil() as u32,
y: y.max(0.0).ceil() as u32,
width: width.ceil() as u32,
height: height.ceil() as u32,
},
layer.offset + *offset,
);
layers.push(clip_layer);
let new_layer = Layer::new(layer.bounds, layer.offset);
// TODO: Primitive culling
self.draw_primitive(content, layers);
layers.push(new_layer);
layers.push(clip_layer);
self.draw_primitive(content, layers);
layers.push(new_layer);
}
}
}
}