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canvas: Clamp alpha values 

Values outside the range of 0 and 1 are ignored in canvas, unlike
Flash that clamps them.
This commit is contained in:
relrelb 2021-12-20 19:42:50 +02:00 committed by relrelb
parent ccef61d076
commit b405870005
1 changed files with 2 additions and 1 deletions
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3
render/canvas/src/lib.rs
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@ -433,8 +433,9 @@ impl WebCanvasRenderBackend {
&& color_transform.b_add == 0 && color_transform.b_add == 0
&& color_transform.a_add == 0 && color_transform.a_add == 0
{ {
// Values outside the range of 0 and 1 are ignored in canvas, unlike Flash that clamps them.
self.context self.context
.set_global_alpha(f64::from(color_transform.a_mult)); .set_global_alpha(f64::from(color_transform.a_mult).clamp(0.0, 1.0));
} else { } else {
let mult = color_transform.mult_rgba_normalized(); let mult = color_transform.mult_rgba_normalized();
let add = color_transform.add_rgba_normalized(); let add = color_transform.add_rgba_normalized();