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Fixed scaling artefacts in paint worklets caused by zoom and hidpi.

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This commit is contained in:
Alan Jeffrey 2017-06-23 11:07:02 -05:00
parent e19fefcb47
commit caa3585219
24 changed files with 160 additions and 77 deletions
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32
components/script/dom/paintrenderingcontext2d.rs
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@ -2,7 +2,6 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use app_units::Au;
use canvas_traits::CanvasData;
use canvas_traits::CanvasMsg;
use canvas_traits::FromLayoutMsg;
@ -26,12 +25,18 @@ use dom::canvaspattern::CanvasPattern;
use dom::canvasrenderingcontext2d::CanvasRenderingContext2D;
use dom::paintworkletglobalscope::PaintWorkletGlobalScope;
use dom_struct::dom_struct;
use euclid::ScaleFactor;
use euclid::Size2D;
use euclid::TypedSize2D;
use ipc_channel::ipc::IpcSender;
use std::cell::Cell;
use style_traits::CSSPixel;
use style_traits::DevicePixel;
#[dom_struct]
pub struct PaintRenderingContext2D {
context: CanvasRenderingContext2D,
device_pixel_ratio: Cell<ScaleFactor<f32, CSSPixel, DevicePixel>>,
}
impl PaintRenderingContext2D {
@ -39,6 +44,7 @@ impl PaintRenderingContext2D {
let size = Size2D::zero();
PaintRenderingContext2D {
context: CanvasRenderingContext2D::new_inherited(global.upcast(), None, size),
device_pixel_ratio: Cell::new(ScaleFactor::new(1.0)),
}
}
@ -53,9 +59,21 @@ impl PaintRenderingContext2D {
let _ = self.context.ipc_renderer().send(msg);
}
pub fn set_bitmap_dimensions(&self, size: Size2D<Au>) {
let size = Size2D::new(size.width.to_px(), size.height.to_px());
self.context.set_bitmap_dimensions(size);
pub fn set_bitmap_dimensions(&self,
size: TypedSize2D<f32, CSSPixel>,
device_pixel_ratio: ScaleFactor<f32, CSSPixel, DevicePixel>)
{
let size = size * device_pixel_ratio;
self.device_pixel_ratio.set(device_pixel_ratio);
self.context.set_bitmap_dimensions(size.to_untyped().to_i32());
self.scale_by_device_pixel_ratio();
}
fn scale_by_device_pixel_ratio(&self) {
let device_pixel_ratio = self.device_pixel_ratio.get().get() as f64;
if device_pixel_ratio != 1.0 {
self.Scale(device_pixel_ratio, device_pixel_ratio);
}
}
}
@ -92,12 +110,14 @@ impl PaintRenderingContext2DMethods for PaintRenderingContext2D {
// https://html.spec.whatwg.org/multipage/#dom-context-2d-settransform
fn SetTransform(&self, a: f64, b: f64, c: f64, d: f64, e: f64, f: f64) {
self.context.SetTransform(a, b, c, d, e, f)
self.context.SetTransform(a, b, c, d, e, f);
self.scale_by_device_pixel_ratio();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-resettransform
fn ResetTransform(&self) {
self.context.ResetTransform()
self.context.ResetTransform();
self.scale_by_device_pixel_ratio();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-globalalpha