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layout: Store viewport and screen size separately.

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Fixes a bug whereby all nodes would get unconditionally reflowed on
every layout event if the page set a viewport.
This commit is contained in:
Patrick Walton 2015-11-02 14:00:52 -08:00
parent 1e3010e4cd
commit 3ae5f04bd1
4 changed files with 50 additions and 37 deletions
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46
components/layout/layout_task.rs
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@ -109,9 +109,13 @@ pub struct LayoutTaskData {
/// The channel on which messages can be sent to the constellation.
pub constellation_chan: ConstellationChan,
/// The size of the viewport.
/// The size of the screen.
pub screen_size: Size2D<Au>,
/// The size of the viewport. This may be different from the size of the screen due to viewport
/// constraints.
pub viewport_size: Size2D<Au>,
/// The root stacking context.
pub stacking_context: Option<Arc<StackingContext>>,
@ -408,6 +412,7 @@ impl LayoutTask {
image_cache_task: image_cache_task,
constellation_chan: constellation_chan,
screen_size: screen_size,
viewport_size: screen_size,
stacking_context: None,
stylist: stylist,
parallel_traversal: parallel_traversal,
@ -445,7 +450,7 @@ impl LayoutTask {
SharedLayoutContext {
image_cache_task: rw_data.image_cache_task.clone(),
image_cache_sender: self.image_cache_sender.clone(),
screen_size: rw_data.screen_size.clone(),
viewport_size: rw_data.viewport_size.clone(),
screen_size_changed: screen_size_changed,
constellation_chan: rw_data.constellation_chan.clone(),
layout_chan: self.chan.clone(),
@ -1033,7 +1038,7 @@ impl LayoutTask {
|| {
flow::mut_base(flow_ref::deref_mut(layout_root)).stacking_relative_position =
LogicalPoint::zero(writing_mode).to_physical(writing_mode,
rw_data.screen_size);
rw_data.viewport_size);
flow::mut_base(flow_ref::deref_mut(layout_root)).clip =
ClippingRegion::from_rect(&data.page_clip_rect);
@ -1138,24 +1143,31 @@ impl LayoutTask {
let mut rw_data = self.lock_rw_data(possibly_locked_rw_data);
let initial_viewport = data.window_size.initial_viewport;
let old_screen_size = rw_data.screen_size;
let old_viewport_size = rw_data.viewport_size;
let current_screen_size = Size2D::new(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 {
// Calculate the actual viewport as per DEVICE-ADAPT § 6
let device = Device::new(MediaType::Screen, initial_viewport);
rw_data.stylist.set_device(device);
// 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() {
let constraints = rw_data.stylist.constrain_viewport();
rw_data.viewport_size = match constraints {
Some(ref constraints) => {
debug!("Viewport constraints: {:?}", constraints);
// other rules are evaluated against the actual viewport
rw_data.screen_size = Size2D::new(Au::from_f32_px(constraints.size.width.get()),
Au::from_f32_px(constraints.size.height.get()));
Size2D::new(Au::from_f32_px(constraints.size.width.get()),
Au::from_f32_px(constraints.size.height.get()))
}
None => current_screen_size,
};
// Handle conditions where the entire flow tree is invalid.
let viewport_size_changed = rw_data.viewport_size != old_viewport_size;
if viewport_size_changed {
if let Some(constraints) = constraints {
let device = Device::new(MediaType::Screen, constraints.size);
rw_data.stylist.set_device(device);
@ -1168,7 +1180,7 @@ impl LayoutTask {
// If the entire flow tree is invalid, then it will be reflowed anyhow.
let needs_dirtying = rw_data.stylist.update();
let needs_reflow = screen_size_changed && !needs_dirtying;
let needs_reflow = viewport_size_changed && !needs_dirtying;
unsafe {
if needs_dirtying {
LayoutTask::dirty_all_nodes(node);
@ -1191,7 +1203,7 @@ impl LayoutTask {
// Create a layout context for use throughout the following passes.
let mut shared_layout_context = self.build_shared_layout_context(&*rw_data,
screen_size_changed,
viewport_size_changed,
&self.url,
data.reflow_info.goal);
@ -1262,8 +1274,8 @@ impl LayoutTask {
let mut must_regenerate_display_lists = false;
let mut old_visible_rects = HashMap::with_hash_state(Default::default());
let inflation_amount =
Size2D::new(rw_data.screen_size.width * DISPLAY_PORT_THRESHOLD_SIZE_FACTOR,
rw_data.screen_size.height * DISPLAY_PORT_THRESHOLD_SIZE_FACTOR);
Size2D::new(rw_data.viewport_size.width * DISPLAY_PORT_THRESHOLD_SIZE_FACTOR,
rw_data.viewport_size.height * DISPLAY_PORT_THRESHOLD_SIZE_FACTOR);
for &(ref layer_id, ref new_visible_rect) in &new_visible_rects {
match rw_data.visible_rects.get(layer_id) {
None => {