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style: Modify background image styling to only apply URL-sourced images when backplate is enabled.

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Differential Revision: https://phabricator.services.mozilla.com/D64200
This commit is contained in:
Morgan Reschenberg 2020-03-04 01:19:41 +00:00 • committed by Emilio Cobos Álvarez
parent b9bf5fb868
commit 45cc310f7f
1 changed files with 14 additions and 3 deletions
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17
components/style/properties/cascade.rs
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@ -380,6 +380,9 @@ fn application_when_ignoring_colors(
// Here we check backplate status to decide if ignoring background-image
// is the right decision.
match *declaration {
// If we've got multiple declarations in the same block, they'll
// get overridden at parse time. We should probably adjust this
// to turn Ignored decls into `none`. See 1619701
PropertyDeclaration::BackgroundColor(ref color) => {
if color.is_transparent() {
return DeclarationApplication::Apply;
@ -405,11 +408,19 @@ fn application_when_ignoring_colors(
// special case along with the 'ignored_when_colors_disabled=True' mako line
// for the "background-image" property.
#[cfg(feature = "gecko")]
PropertyDeclaration::BackgroundImage(..) => {
PropertyDeclaration::BackgroundImage(ref bkg) => {
use crate::values::generics::image::Image;
// We should only allow images to be rendered in HCM if the backplate pref
// is enabled, and if all the images applied to the background are from URLs.
// If one or more background images aren't from URL's (ie. gradients)
// we should ignore all background-image styling.
if static_prefs::pref!("browser.display.permit_backplate") {
DeclarationApplication::Apply
if bkg.0.iter().all(|image| matches!(*image, Image::Url(..))) {
return DeclarationApplication::Apply;
}
return DeclarationApplication::Ignore;
} else {
DeclarationApplication::Ignore
return DeclarationApplication::Ignore;
}
},
_ => DeclarationApplication::Ignore,