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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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38
components/compositing/compositor.rs
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@ -43,6 +43,7 @@ use std::mem as std_mem;
use std::rc::Rc;
use std::slice::bytes::copy_memory;
use std::sync::mpsc::Sender;
use style::viewport::ViewportConstraints;
use time::{precise_time_ns, precise_time_s};
use url::Url;
use util::geometry::{PagePx, ScreenPx, ViewportPx};
@ -75,6 +76,10 @@ pub struct IOCompositor<Window: WindowMethods> {
/// "Mobile-style" zoom that does not reflow the page.
viewport_zoom: ScaleFactor<PagePx, ViewportPx, f32>,
/// Viewport zoom constraints provided by @viewport.
min_viewport_zoom: Option<ScaleFactor<PagePx, ViewportPx, f32>>,
max_viewport_zoom: Option<ScaleFactor<PagePx, ViewportPx, f32>>,
/// "Desktop-style" zoom that resizes the viewport to fit the window.
/// See `ViewportPx` docs in util/geom.rs for details.
page_zoom: ScaleFactor<ViewportPx, ScreenPx, f32>,
@ -219,6 +224,8 @@ impl<Window: WindowMethods> IOCompositor<Window> {
shutdown_state: ShutdownState::NotShuttingDown,
page_zoom: ScaleFactor::new(1.0),
viewport_zoom: ScaleFactor::new(1.0),
min_viewport_zoom: None,
max_viewport_zoom: None,
zoom_action: false,
zoom_time: 0f64,
got_load_complete_message: false,
@ -389,6 +396,10 @@ impl<Window: WindowMethods> IOCompositor<Window> {
}
}
(Msg::ViewportConstrained(pipeline_id, constraints), ShutdownState::NotShuttingDown) => {
self.constrain_viewport(pipeline_id, constraints);
}
// When we are shutting_down, we need to avoid performing operations
// such as Paint that may crash because we have begun tearing down
// the rest of our resources.
@ -945,6 +956,21 @@ impl<Window: WindowMethods> IOCompositor<Window> {
}
}
fn constrain_viewport(&mut self, pipeline_id: PipelineId, constraints: ViewportConstraints) {
let is_root = self.root_pipeline.as_ref().map_or(false, |root_pipeline| {
root_pipeline.id == pipeline_id
});
if is_root {
// TODO: actual viewport size
self.viewport_zoom = constraints.initial_zoom;
self.min_viewport_zoom = constraints.min_zoom;
self.max_viewport_zoom = constraints.max_zoom;
self.update_zoom_transform();
}
}
fn device_pixels_per_screen_px(&self) -> ScaleFactor<ScreenPx, DevicePixel, f32> {
match opts::get().device_pixels_per_px {
Some(device_pixels_per_px) => device_pixels_per_px,
@ -976,12 +1002,19 @@ impl<Window: WindowMethods> IOCompositor<Window> {
// TODO(pcwalton): I think this should go through the same queuing as scroll events do.
fn on_pinch_zoom_window_event(&mut self, magnification: f32) {
use num::Float;
self.zoom_action = true;
self.zoom_time = precise_time_s();
let old_viewport_zoom = self.viewport_zoom;
self.viewport_zoom = ScaleFactor::new((self.viewport_zoom.get() * magnification).max(1.0));
let viewport_zoom = self.viewport_zoom;
let mut viewport_zoom = self.viewport_zoom.get() * magnification;
if let Some(min_zoom) = self.min_viewport_zoom.as_ref() {
viewport_zoom = min_zoom.get().max(viewport_zoom)
}
let viewport_zoom = self.max_viewport_zoom.as_ref().map_or(1., |z| z.get()).min(viewport_zoom);
let viewport_zoom = ScaleFactor::new(viewport_zoom);
self.viewport_zoom = viewport_zoom;
self.update_zoom_transform();
@ -1452,4 +1485,3 @@ pub enum CompositingReason {
/// The window has been zoomed.
Zoom,
}