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Fixed scaling artefacts in paint worklets caused by zoom and hidpi.

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This commit is contained in:
Alan Jeffrey 2017-06-23 11:07:02 -05:00
parent e19fefcb47
commit caa3585219
24 changed files with 160 additions and 77 deletions
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12
components/style/gecko/media_queries.rs
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@ -4,9 +4,11 @@
//! Gecko's media-query device and expression representation.
use app_units::AU_PER_PX;
use app_units::Au;
use context::QuirksMode;
use cssparser::{CssStringWriter, Parser, RGBA, Token, BasicParseError};
use euclid::ScaleFactor;
use euclid::Size2D;
use font_metrics::get_metrics_provider_for_product;
use gecko::values::convert_nscolor_to_rgba;
@ -25,6 +27,7 @@ use std::fmt::{self, Write};
use std::sync::atomic::{AtomicBool, AtomicIsize, Ordering};
use str::starts_with_ignore_ascii_case;
use string_cache::Atom;
use style_traits::{CSSPixel, DevicePixel};
use style_traits::{ToCss, ParseError, StyleParseError};
use style_traits::viewport::ViewportConstraints;
use values::{CSSFloat, specified};
@ -153,6 +156,15 @@ impl Device {
})
}
/// Returns the device pixel ratio.
pub fn device_pixel_ratio(&self) -> ScaleFactor<f32, CSSPixel, DevicePixel> {
let override_dppx = self.pres_context().mOverrideDPPX;
if override_dppx > 0.0 { return ScaleFactor::new(override_dppx); }
let au_per_dpx = self.pres_context().mCurAppUnitsPerDevPixel as f32;
let au_per_px = AU_PER_PX as f32;
ScaleFactor::new(au_per_px / au_per_dpx)
}
/// Returns whether document colors are enabled.
pub fn use_document_colors(&self) -> bool {
self.pres_context().mUseDocumentColors() != 0