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Auto merge of #5361 - luniv:css-device-adapt, r=mbrubeck

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Spec: http://dev.w3.org/csswg/css-device-adapt/

Currently, the actual viewport is used by the layout task as part of the reflow, and the compositor uses the zoom constraints. I'm not sure if anywhere else currently needs access to the constraints (i.e. there's no CSSOM as far as I can tell).

I did not implement sections 9 (viewport <META>) or 10 (handling 'auto' for 'zoom').

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This commit is contained in:
bors-servo 2015-05-06 12:41:09 -05:00
commit ccf1e6b9a7
24 changed files with 1030 additions and 71 deletions
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25
components/layout/layout_task.rs
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@ -847,19 +847,32 @@ impl LayoutTask {
let mut rw_data = self.lock_rw_data(possibly_locked_rw_data);
// TODO: Calculate the "actual viewport":
// http://www.w3.org/TR/css-device-adapt/#actual-viewport
let viewport_size = data.window_size.initial_viewport;
let initial_viewport = data.window_size.initial_viewport;
let old_screen_size = rw_data.screen_size;
let current_screen_size = Size2D(Au::from_f32_px(viewport_size.width.get()),
Au::from_f32_px(viewport_size.height.get()));
let current_screen_size = Size2D(Au::from_f32_px(initial_viewport.width.get()),
Au::from_f32_px(initial_viewport.height.get()));
rw_data.screen_size = current_screen_size;
// Handle conditions where the entire flow tree is invalid.
let screen_size_changed = current_screen_size != old_screen_size;
if screen_size_changed {
let device = Device::new(MediaType::Screen, data.window_size.initial_viewport);
// Calculate the actual viewport as per DEVICE-ADAPT § 6
let device = Device::new(MediaType::Screen, initial_viewport);
rw_data.stylist.set_device(device);
if let Some(constraints) = rw_data.stylist.constrain_viewport() {
debug!("Viewport constraints: {:?}", constraints);
// other rules are evaluated against the actual viewport
rw_data.screen_size = Size2D(Au::from_f32_px(constraints.size.width.get()),
Au::from_f32_px(constraints.size.height.get()));
let device = Device::new(MediaType::Screen, constraints.size);
rw_data.stylist.set_device(device);
// let the constellation know about the viewport constraints
let ConstellationChan(ref constellation_chan) = rw_data.constellation_chan;
constellation_chan.send(ConstellationMsg::ViewportConstrained(self.id, constraints)).unwrap();
}
}
// If the entire flow tree is invalid, then it will be reflowed anyhow.