auto merge of #3809 : mrobinson/servo/display-list-optimization, r=pcwalton

Instead of creating a display list for the entire page, only create one
for an area that expands around the viewport. On my machine this makes
incremental layout of http://timecube.com 50% faster.

1 files changed, 1 insertions, 5 deletions

diff --git a/components/layout/block.rs b/components/layout/block.rs
index 8835682644d..baf80f6ca3f 100644
--- a/components/layout/block.rs
+++ b/components/layout/block.rs
@@ -48,7 +48,7 @@ use geom::Size2D;
 use gfx::display_list::BlockLevel;
 use serialize::{Encoder, Encodable};
 use servo_msg::compositor_msg::LayerId;
-use servo_util::geometry::{Au, MAX_AU, MAX_RECT};
+use servo_util::geometry::{Au, MAX_AU};
 use servo_util::logical_geometry::{LogicalPoint, LogicalRect, LogicalSize};
 use servo_util::opts;
 use std::cmp::{max, min};
@@ -1665,10 +1665,6 @@ impl Flow for BlockFlow {
         // FIXME(#2795): Get the real container size
         let container_size = Size2D::zero();
 
-        if self.is_root() {
-            self.base.clip_rect = MAX_RECT;
-        }
-
         if self.base.flags.is_absolutely_positioned() {
             let position_start = self.base.position.start.to_physical(self.base.writing_mode,
                                                                       container_size);