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layout: Implement CSS linear gradients per the CSS-IMAGES specification.

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This implements the CSS `linear-gradient` property per the CSS-IMAGES
specification:

    http://dev.w3.org/csswg/css-images-3/

Improves GitHub.
This commit is contained in:
Patrick Walton 2014-10-15 21:07:36 -07:00
parent 44fa9f9b18
commit 215c2a9d4c
17 changed files with 865 additions and 42 deletions
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53
components/gfx/render_context.rs
View file

@ -2,22 +2,23 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use display_list::{SidewaysLeft, SidewaysRight, TextDisplayItem, Upright};
use font_context::FontContext;
use style::computed_values::border_style;
//! Painting of display lists using Moz2D/Azure.
use azure::azure_hl::{B8G8R8A8, A8, Color, ColorPattern, ColorPatternRef, DrawOptions};
use azure::azure_hl::{DrawSurfaceOptions,DrawTarget, Linear, SourceOp, StrokeOptions};
use azure::azure_hl::{DrawSurfaceOptions, DrawTarget, ExtendClamp, GradientStop, Linear};
use azure::azure_hl::{LinearGradientPattern, LinearGradientPatternRef, SourceOp, StrokeOptions};
use azure::scaled_font::ScaledFont;
use azure::{AZ_CAP_BUTT, AzDrawTargetFillGlyphs, AzFloat, struct__AzDrawOptions, struct__AzGlyph};
use azure::{struct__AzGlyphBuffer, struct__AzPoint};
use azure::{AZ_CAP_BUTT, AzFloat, struct__AzDrawOptions, struct__AzGlyph};
use azure::{struct__AzGlyphBuffer, struct__AzPoint, AzDrawTargetFillGlyphs};
use display_list::{SidewaysLeft, SidewaysRight, TextDisplayItem, Upright};
use font_context::FontContext;
use geom::matrix2d::Matrix2D;
use geom::point::Point2D;
use geom::rect::Rect;
use geom::size::Size2D;
use geom::side_offsets::SideOffsets2D;
use libc::types::common::c99::{uint16_t, uint32_t};
use geom::size::Size2D;
use libc::size_t;
use libc::types::common::c99::{uint16_t, uint32_t};
use png::{RGB8, RGBA8, K8, KA8};
use servo_net::image::base::Image;
use servo_util::geometry::Au;
@ -25,9 +26,10 @@ use servo_util::opts;
use servo_util::range::Range;
use std::num::Zero;
use std::ptr;
use style::computed_values::border_style;
use sync::Arc;
use text::glyph::CharIndex;
use text::TextRun;
use text::glyph::CharIndex;
pub struct RenderContext<'a> {
pub draw_target: &'a DrawTarget,
@ -443,6 +445,36 @@ impl<'a> RenderContext<'a> {
self.draw_target.set_transform(current_transform)
}
}
/// Draws a linear gradient in the given boundaries from the given start point to the given end
/// point with the given stops.
pub fn draw_linear_gradient(&self,
bounds: &Rect<Au>,
start_point: &Point2D<Au>,
end_point: &Point2D<Au>,
stops: &[GradientStop]) {
self.draw_target.make_current();
let stops = self.draw_target.create_gradient_stops(stops, ExtendClamp);
let pattern = LinearGradientPattern::new(&start_point.to_azure_point(),
&end_point.to_azure_point(),
stops,
&Matrix2D::identity());
self.draw_target.fill_rect(&bounds.to_azure_rect(),
LinearGradientPatternRef(&pattern),
None);
}
}
trait ToAzurePoint {
fn to_azure_point(&self) -> Point2D<AzFloat>;
}
impl ToAzurePoint for Point2D<Au> {
fn to_azure_point(&self) -> Point2D<AzFloat> {
Point2D(self.x.to_nearest_px() as AzFloat, self.y.to_nearest_px() as AzFloat)
}
}
trait ToAzureRect {
@ -451,8 +483,7 @@ trait ToAzureRect {
impl ToAzureRect for Rect<Au> {
fn to_azure_rect(&self) -> Rect<AzFloat> {
Rect(Point2D(self.origin.x.to_nearest_px() as AzFloat,
self.origin.y.to_nearest_px() as AzFloat),
Rect(self.origin.to_azure_point(),
Size2D(self.size.width.to_nearest_px() as AzFloat,
self.size.height.to_nearest_px() as AzFloat))
}