style: Only apply grayscale filter for printing on print preview.

Differential Revision: https://phabricator.services.mozilla.com/D88065
This commit is contained in:
Emilio Cobos Álvarez 2020-08-27 09:37:31 +00:00
parent 16e0fd3e1f
commit 35716fd514
2 changed files with 28 additions and 1 deletions

View file

@ -521,6 +521,18 @@ fn eval_moz_is_glyph(
query_value.map_or(is_glyph, |v| v == is_glyph)
}
fn eval_moz_print_preview(
device: &Device,
query_value: Option<bool>,
_: Option<RangeOrOperator>,
) -> bool {
let is_print_preview = device.is_print_preview();
if is_print_preview {
debug_assert_eq!(device.media_type(), MediaType::print());
}
query_value.map_or(is_print_preview, |v| v == is_print_preview)
}
fn eval_moz_is_resource_document(
device: &Device,
query_value: Option<bool>,
@ -601,7 +613,7 @@ macro_rules! system_metric_feature {
/// to support new types in these entries and (2) ensuring that either
/// nsPresContext::MediaFeatureValuesChanged is called when the value that
/// would be returned by the evaluator function could change.
pub static MEDIA_FEATURES: [MediaFeatureDescription; 55] = [
pub static MEDIA_FEATURES: [MediaFeatureDescription; 56] = [
feature!(
atom!("width"),
AllowsRanges::Yes,
@ -799,6 +811,12 @@ pub static MEDIA_FEATURES: [MediaFeatureDescription; 55] = [
Evaluator::Ident(eval_moz_os_version),
ParsingRequirements::CHROME_AND_UA_ONLY,
),
feature!(
atom!("-moz-print-preview"),
AllowsRanges::No,
Evaluator::BoolInteger(eval_moz_print_preview),
ParsingRequirements::CHROME_AND_UA_ONLY,
),
system_metric_feature!(atom!("-moz-scrollbar-start-backward")),
system_metric_feature!(atom!("-moz-scrollbar-start-forward")),
system_metric_feature!(atom!("-moz-scrollbar-end-backward")),

View file

@ -206,6 +206,15 @@ impl Device {
self.reset_computed_values();
}
/// Returns whether this document is in print preview.
pub fn is_print_preview(&self) -> bool {
let pc = match self.pres_context() {
Some(pc) => pc,
None => return false,
};
pc.mType == structs::nsPresContext_nsPresContextType_eContext_PrintPreview
}
/// Returns the current media type of the device.
pub fn media_type(&self) -> MediaType {
let pc = match self.pres_context() {