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net: Don't load the placeholder image for background images, only for

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image fragments.

This also changes the way the placeholder is handled in the image cache
task to decode it up front instead of each time an image fails to load,
both because it was more convenient to implement that way and because
it saves CPU cycles to do so.

This matches the behavior of Gecko and WebKit. It improves the look of
our cached copy of Wikipedia.
This commit is contained in:
Patrick Walton 2015-04-03 14:24:22 -07:00
parent e52197d126
commit 7e7675c1dc
11 changed files with 135 additions and 38 deletions
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3
components/layout/display_list_builder.rs
View file

@ -35,6 +35,7 @@ use gfx::paint_task::{PaintLayer, THREAD_TINT_COLORS};
use msg::compositor_msg::ScrollPolicy;
use msg::constellation_msg::ConstellationChan;
use msg::constellation_msg::Msg as ConstellationMsg;
use net_traits::image_cache_task::UsePlaceholder;
use png::{self, PixelsByColorType};
use std::cmp;
use std::default::Default;
@ -432,7 +433,7 @@ impl FragmentDisplayListBuilding for Fragment {
clip: &ClippingRegion,
image_url: &Url) {
let background = style.get_background();
let image = layout_context.get_or_request_image(image_url.clone());
let image = layout_context.get_or_request_image(image_url.clone(), UsePlaceholder::No);
if let Some(image) = image {
debug!("(building display list) building background image");