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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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58
components/script/dom/paintworkletglobalscope.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::CanvasImageData;
use dom::bindings::callback::CallbackContainer;
@ -27,7 +26,8 @@ use dom::workletglobalscope::WorkletGlobalScope;
use dom::workletglobalscope::WorkletGlobalScopeInit;
use dom::workletglobalscope::WorkletTask;
use dom_struct::dom_struct;
use euclid::Size2D;
use euclid::ScaleFactor;
use euclid::TypedSize2D;
use ipc_channel::ipc::IpcSender;
use ipc_channel::ipc::IpcSharedMemory;
use js::jsapi::Call;
@ -59,6 +59,8 @@ use std::ptr::null_mut;
use std::rc::Rc;
use std::sync::Arc;
use std::sync::Mutex;
use style_traits::CSSPixel;
use style_traits::DevicePixel;
/// https://drafts.css-houdini.org/css-paint-api/#paintworkletglobalscope
#[dom_struct]
@ -94,9 +96,9 @@ impl PaintWorkletGlobalScope {
pub fn perform_a_worklet_task(&self, task: PaintWorkletTask) {
match task {
PaintWorkletTask::DrawAPaintImage(name, size, properties, sender) => {
PaintWorkletTask::DrawAPaintImage(name, size, device_pixel_ratio, properties, sender) => {
let properties = StylePropertyMapReadOnly::from_iter(self.upcast(), properties);
self.draw_a_paint_image(name, size, &*properties, sender);
self.draw_a_paint_image(name, size, device_pixel_ratio, &*properties, sender);
}
}
}
@ -104,25 +106,28 @@ impl PaintWorkletGlobalScope {
/// https://drafts.css-houdini.org/css-paint-api/#draw-a-paint-image
fn draw_a_paint_image(&self,
name: Atom,
size: Size2D<Au>,
size_in_px: TypedSize2D<f32, CSSPixel>,
device_pixel_ratio: ScaleFactor<f32, CSSPixel, DevicePixel>,
properties: &StylePropertyMapReadOnly,
sender: IpcSender<CanvasData>)
{
// TODO: document paint definitions.
self.invoke_a_paint_callback(name, size, properties, sender);
self.invoke_a_paint_callback(name, size_in_px, device_pixel_ratio, properties, sender);
}
/// https://drafts.css-houdini.org/css-paint-api/#invoke-a-paint-callback
#[allow(unsafe_code)]
fn invoke_a_paint_callback(&self,
name: Atom,
size: Size2D<Au>,
size_in_px: TypedSize2D<f32, CSSPixel>,
device_pixel_ratio: ScaleFactor<f32, CSSPixel, DevicePixel>,
properties: &StylePropertyMapReadOnly,
sender: IpcSender<CanvasData>)
{
let width = size.width.to_px().abs() as u32;
let height = size.height.to_px().abs() as u32;
debug!("Invoking a paint callback {}({},{}).", name, width, height);
let size_in_dpx = size_in_px * device_pixel_ratio;
let size_in_dpx = TypedSize2D::new(size_in_dpx.width.abs() as u32, size_in_dpx.height.abs() as u32);
debug!("Invoking a paint callback {}({},{}) at {}.",
name, size_in_px.width, size_in_px.height, device_pixel_ratio);
let cx = self.worklet_global.get_cx();
let _ac = JSAutoCompartment::new(cx, self.worklet_global.reflector().get_jsobject().get());
@ -135,13 +140,13 @@ impl PaintWorkletGlobalScope {
None => {
// Step 2.2.
warn!("Drawing un-registered paint definition {}.", name);
return self.send_invalid_image(size, sender);
return self.send_invalid_image(size_in_dpx, sender);
}
Some(definition) => {
// Step 5.1
if !definition.constructor_valid_flag.get() {
debug!("Drawing invalid paint definition {}.", name);
return self.send_invalid_image(size, sender);
return self.send_invalid_image(size_in_dpx, sender);
}
class_constructor.set(definition.class_constructor.get());
paint_function.set(definition.paint_function.get());
@ -169,7 +174,7 @@ impl PaintWorkletGlobalScope {
self.paint_definitions.borrow_mut().get_mut(&name)
.expect("Vanishing paint definition.")
.constructor_valid_flag.set(false);
return self.send_invalid_image(size, sender);
return self.send_invalid_image(size_in_dpx, sender);
}
// Step 5.4
entry.insert(Box::new(Heap::default())).set(paint_instance.get());
@ -180,10 +185,10 @@ impl PaintWorkletGlobalScope {
// Step 8
// TODO: the spec requires creating a new paint rendering context each time,
// this code recycles the same one.
rendering_context.set_bitmap_dimensions(size);
rendering_context.set_bitmap_dimensions(size_in_px, device_pixel_ratio);
// Step 9
let paint_size = PaintSize::new(self, size);
let paint_size = PaintSize::new(self, size_in_px);
// TODO: Step 10
// Steps 11-12
@ -202,17 +207,19 @@ impl PaintWorkletGlobalScope {
if unsafe { JS_IsExceptionPending(cx) } {
debug!("Paint function threw an exception {}.", name);
unsafe { JS_ClearPendingException(cx); }
return self.send_invalid_image(size, sender);
return self.send_invalid_image(size_in_dpx, sender);
}
rendering_context.send_data(sender);
}
// https://drafts.csswg.org/css-images-4/#invalid-image
fn send_invalid_image(&self, size: Size2D<Au>, sender: IpcSender<CanvasData>) {
fn send_invalid_image(&self,
size: TypedSize2D<u32, DevicePixel>,
sender: IpcSender<CanvasData>)
{
debug!("Sending an invalid image.");
let width = size.width.to_px().abs() as u32;
let height = size.height.to_px().abs() as u32;
let width = size.width as u32;
let height = size.height as u32;
let len = (width as usize) * (height as usize) * 4;
let pixel = [0x00, 0x00, 0x00, 0x00];
let bytes: Vec<u8> = pixel.iter().cloned().cycle().take(len).collect();
@ -235,12 +242,13 @@ impl PaintWorkletGlobalScope {
struct WorkletPainter(Atom, Mutex<WorkletExecutor>);
impl Painter for WorkletPainter {
fn draw_a_paint_image(&self,
size: Size2D<Au>,
size: TypedSize2D<f32, CSSPixel>,
device_pixel_ratio: ScaleFactor<f32, CSSPixel, DevicePixel>,
properties: Vec<(Atom, String)>,
sender: IpcSender<CanvasData>)
{
let name = self.0.clone();
let task = PaintWorkletTask::DrawAPaintImage(name, size, properties, sender);
let task = PaintWorkletTask::DrawAPaintImage(name, size, device_pixel_ratio, properties, sender);
self.1.lock().expect("Locking a painter.")
.schedule_a_worklet_task(WorkletTask::Paint(task));
}
@ -334,7 +342,11 @@ impl PaintWorkletGlobalScopeMethods for PaintWorkletGlobalScope {
/// Tasks which can be peformed by a paint worklet
pub enum PaintWorkletTask {
DrawAPaintImage(Atom, Size2D<Au>, Vec<(Atom, String)>, IpcSender<CanvasData>)
DrawAPaintImage(Atom,
TypedSize2D<f32, CSSPixel>,
ScaleFactor<f32, CSSPixel, DevicePixel>,
Vec<(Atom, String)>,
IpcSender<CanvasData>)
}
/// A paint definition