mirror of
https://github.com/servo/servo.git
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1899 lines
98 KiB
Rust
1899 lines
98 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Builds display lists from flows and fragments.
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//!
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//! Other browser engines sometimes call this "painting", but it is more accurately called display
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//! list building, as the actual painting does not happen here—only deciding *what* we're going to
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//! paint.
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#![deny(unsafe_code)]
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use azure::azure_hl::Color;
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use block::BlockFlow;
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use context::LayoutContext;
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use flow::{self, BaseFlow, Flow, IS_ABSOLUTELY_POSITIONED, NEEDS_LAYER};
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use fragment::{CoordinateSystem, Fragment, IframeFragmentInfo, ImageFragmentInfo};
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use fragment::{ScannedTextFragmentInfo, SpecificFragmentInfo};
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use inline::InlineFlow;
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use list_item::ListItemFlow;
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use model::{self, MaybeAuto, ToGfxMatrix, ToAu};
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use table_cell::CollapsedBordersForCell;
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use euclid::{Point2D, Point3D, Rect, Size2D, SideOffsets2D};
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use euclid::Matrix4;
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use gfx_traits::color;
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use gfx::display_list::{BLUR_INFLATION_FACTOR, BaseDisplayItem, BorderDisplayItem};
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use gfx::display_list::{BorderRadii, BoxShadowClipMode, BoxShadowDisplayItem, ClippingRegion};
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use gfx::display_list::{DisplayItem, DisplayList, DisplayItemMetadata};
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use gfx::display_list::{GradientDisplayItem};
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use gfx::display_list::{GradientStop, ImageDisplayItem, LineDisplayItem};
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use gfx::display_list::{OpaqueNode, SolidColorDisplayItem};
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use gfx::display_list::{StackingContext, TextDisplayItem, TextOrientation};
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use gfx::paint_task::{PaintLayer, THREAD_TINT_COLORS};
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use msg::compositor_msg::{ScrollPolicy, LayerId};
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use msg::constellation_msg::ConstellationChan;
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use msg::constellation_msg::Msg as ConstellationMsg;
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use net_traits::image_cache_task::UsePlaceholder;
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use png::{self, PixelsByColorType};
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use std::cmp;
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use std::default::Default;
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use std::iter::repeat;
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use std::sync::Arc;
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use std::f32;
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use style::computed_values::filter::Filter;
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use style::computed_values::{background_attachment, background_clip, background_origin,
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background_repeat, background_size};
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use style::computed_values::{border_style, image_rendering, overflow_x, position,
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visibility, transform, transform_style};
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use style::properties::ComputedValues;
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use style::properties::style_structs::Border;
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use style::values::RGBA;
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use style::values::computed::{Image, LinearGradient};
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use style::values::computed::{LengthOrNone, LengthOrPercentage, LengthOrPercentageOrAuto};
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use style::values::specified::{AngleOrCorner, HorizontalDirection, VerticalDirection};
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use url::Url;
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use util::cursor::Cursor;
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use util::geometry::{Au, ZERO_POINT};
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use util::logical_geometry::{LogicalPoint, LogicalRect, LogicalSize, WritingMode};
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use util::opts;
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use canvas_traits::{CanvasMsg, CanvasCommonMsg};
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use std::sync::mpsc::channel;
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/// A possible `PaintLayer` for an stacking context
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pub enum StackingContextLayer {
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Existing(PaintLayer),
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IfCanvas(LayerId),
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}
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/// The results of display list building for a single flow.
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pub enum DisplayListBuildingResult {
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None,
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StackingContext(Arc<StackingContext>),
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Normal(Box<DisplayList>),
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}
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impl DisplayListBuildingResult {
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/// Adds the display list items contained within this display list building result to the given
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/// display list, preserving stacking order. If this display list building result does not
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/// consist of an entire stacking context, it will be emptied.
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pub fn add_to(&mut self, display_list: &mut DisplayList) {
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match *self {
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DisplayListBuildingResult::None => return,
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DisplayListBuildingResult::StackingContext(ref mut stacking_context) => {
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display_list.children.push_back((*stacking_context).clone())
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}
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DisplayListBuildingResult::Normal(ref mut source_display_list) => {
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display_list.append_from(&mut **source_display_list)
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}
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}
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}
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}
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pub trait FragmentDisplayListBuilding {
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/// Adds the display items necessary to paint the background of this fragment to the display
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/// list if necessary.
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fn build_display_list_for_background_if_applicable(&self,
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style: &ComputedValues,
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display_list: &mut DisplayList,
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layout_context: &LayoutContext,
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level: StackingLevel,
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absolute_bounds: &Rect<Au>,
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clip: &ClippingRegion);
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/// Computes the background size for an image with the given background area according to the
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/// rules in CSS-BACKGROUNDS § 3.9.
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fn compute_background_image_size(&self,
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style: &ComputedValues,
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bounds: &Rect<Au>,
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image: &png::Image)
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-> Size2D<Au>;
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/// Adds the display items necessary to paint the background image of this fragment to the
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/// display list at the appropriate stacking level.
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fn build_display_list_for_background_image(&self,
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style: &ComputedValues,
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display_list: &mut DisplayList,
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layout_context: &LayoutContext,
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level: StackingLevel,
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absolute_bounds: &Rect<Au>,
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clip: &ClippingRegion,
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image_url: &Url);
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/// Adds the display items necessary to paint the background linear gradient of this fragment
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/// to the display list at the appropriate stacking level.
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fn build_display_list_for_background_linear_gradient(&self,
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display_list: &mut DisplayList,
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level: StackingLevel,
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absolute_bounds: &Rect<Au>,
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clip: &ClippingRegion,
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gradient: &LinearGradient,
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style: &ComputedValues);
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/// Adds the display items necessary to paint the borders of this fragment to a display list if
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/// necessary.
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fn build_display_list_for_borders_if_applicable(
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&self,
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style: &ComputedValues,
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border_painting_mode: BorderPaintingMode,
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display_list: &mut DisplayList,
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bounds: &Rect<Au>,
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level: StackingLevel,
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clip: &ClippingRegion);
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/// Adds the display items necessary to paint the outline of this fragment to the display list
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/// if necessary.
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fn build_display_list_for_outline_if_applicable(&self,
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style: &ComputedValues,
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display_list: &mut DisplayList,
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bounds: &Rect<Au>,
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clip: &ClippingRegion);
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/// Adds the display items necessary to paint the box shadow of this fragment to the display
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/// list if necessary.
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fn build_display_list_for_box_shadow_if_applicable(&self,
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style: &ComputedValues,
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list: &mut DisplayList,
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layout_context: &LayoutContext,
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level: StackingLevel,
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absolute_bounds: &Rect<Au>,
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clip: &ClippingRegion);
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/// Adds display items necessary to draw debug boxes around a scanned text fragment.
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fn build_debug_borders_around_text_fragments(&self,
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style: &ComputedValues,
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display_list: &mut DisplayList,
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stacking_relative_border_box: &Rect<Au>,
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stacking_relative_content_box: &Rect<Au>,
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text_fragment: &ScannedTextFragmentInfo,
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clip: &ClippingRegion);
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/// Adds display items necessary to draw debug boxes around this fragment.
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fn build_debug_borders_around_fragment(&self,
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display_list: &mut DisplayList,
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stacking_relative_border_box: &Rect<Au>,
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clip: &ClippingRegion);
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/// Adds the display items for this fragment to the given display list.
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///
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/// Arguments:
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///
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/// * `display_list`: The display list to add display items to.
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/// * `layout_context`: The layout context.
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/// * `dirty`: The dirty rectangle in the coordinate system of the owning flow.
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/// * `stacking_relative_flow_origin`: Position of the origin of the owning flow with respect
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/// to its nearest ancestor stacking context.
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/// * `relative_containing_block_size`: The size of the containing block that
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/// `position: relative` makes use of.
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/// * `clip`: The region to clip the display items to.
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/// * `stacking_relative_display_port`: The position and size of the display port with respect
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/// to the nearest ancestor stacking context.
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fn build_display_list(&mut self,
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display_list: &mut DisplayList,
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layout_context: &LayoutContext,
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stacking_relative_flow_origin: &Point2D<Au>,
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relative_containing_block_size: &LogicalSize<Au>,
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relative_containing_block_mode: WritingMode,
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border_painting_mode: BorderPaintingMode,
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background_and_border_level: BackgroundAndBorderLevel,
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clip: &ClippingRegion,
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stacking_relative_display_port: &Rect<Au>);
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/// Sends the size and position of this iframe fragment to the constellation. This is out of
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/// line to guide inlining.
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fn finalize_position_and_size_of_iframe(&self,
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iframe_fragment: &IframeFragmentInfo,
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offset: Point2D<Au>,
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layout_context: &LayoutContext);
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/// Returns the appropriate clipping region for descendants of this flow.
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fn clipping_region_for_children(&self,
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current_clip: &ClippingRegion,
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stacking_relative_border_box: &Rect<Au>)
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-> ClippingRegion;
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/// Calculates the clipping rectangle for a fragment, taking the `clip` property into account
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/// per CSS 2.1 § 11.1.2.
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fn calculate_style_specified_clip(&self,
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parent_clip: &ClippingRegion,
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stacking_relative_border_box: &Rect<Au>)
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-> ClippingRegion;
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/// Creates the text display item for one text fragment. This can be called multiple times for
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/// one fragment if there are text shadows.
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///
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/// `shadow_blur_radius` will be `Some` if this is a shadow, even if the blur radius is zero.
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fn build_display_list_for_text_fragment(&self,
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display_list: &mut DisplayList,
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text_fragment: &ScannedTextFragmentInfo,
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text_color: RGBA,
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stacking_relative_content_box: &Rect<Au>,
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shadow_blur_radius: Option<Au>,
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offset: &Point2D<Au>,
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clip: &ClippingRegion);
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/// Creates the display item for a text decoration: underline, overline, or line-through.
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fn build_display_list_for_text_decoration(&self,
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display_list: &mut DisplayList,
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color: &RGBA,
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stacking_relative_box: &LogicalRect<Au>,
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clip: &ClippingRegion,
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blur_radius: Au);
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/// A helper method that `build_display_list` calls to create per-fragment-type display items.
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fn build_fragment_type_specific_display_items(&mut self,
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display_list: &mut DisplayList,
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stacking_relative_border_box: &Rect<Au>,
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clip: &ClippingRegion);
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/// Creates a stacking context for associated fragment.
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fn create_stacking_context(&self,
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base_flow: &BaseFlow,
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display_list: Box<DisplayList>,
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layout_context: &LayoutContext,
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layer: StackingContextLayer)
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-> Arc<StackingContext>;
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}
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fn handle_overlapping_radii(size: &Size2D<Au>, radii: &BorderRadii<Au>) -> BorderRadii<Au> {
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// No two corners' border radii may add up to more than the length of the edge
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// between them. To prevent that, all radii are scaled down uniformly.
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fn scale_factor(radius_a: Au, radius_b: Au, edge_length: Au) -> f32 {
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let required = radius_a + radius_b;
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if required <= edge_length {
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1.0
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} else {
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edge_length.to_f32_px() / required.to_f32_px()
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}
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}
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let top_factor = scale_factor(radii.top_left, radii.top_right, size.width);
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let bottom_factor = scale_factor(radii.bottom_left, radii.bottom_right, size.width);
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let left_factor = scale_factor(radii.top_left, radii.bottom_left, size.height);
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let right_factor = scale_factor(radii.top_right, radii.bottom_right, size.height);
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let min_factor = top_factor.min(bottom_factor).min(left_factor).min(right_factor);
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if min_factor < 1.0 {
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BorderRadii {
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top_left: radii.top_left .scale_by(min_factor),
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top_right: radii.top_right .scale_by(min_factor),
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bottom_left: radii.bottom_left .scale_by(min_factor),
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bottom_right: radii.bottom_right.scale_by(min_factor),
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}
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} else {
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*radii
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}
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}
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fn build_border_radius(abs_bounds: &Rect<Au>, border_style: &Border) -> BorderRadii<Au> {
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// TODO(cgaebel): Support border radii even in the case of multiple border widths.
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// This is an extension of supporting elliptical radii. For now, all percentage
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// radii will be relative to the width.
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handle_overlapping_radii(&abs_bounds.size, &BorderRadii {
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top_left: model::specified(border_style.border_top_left_radius,
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abs_bounds.size.width),
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top_right: model::specified(border_style.border_top_right_radius,
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abs_bounds.size.width),
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bottom_right: model::specified(border_style.border_bottom_right_radius,
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abs_bounds.size.width),
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bottom_left: model::specified(border_style.border_bottom_left_radius,
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abs_bounds.size.width),
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})
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}
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impl FragmentDisplayListBuilding for Fragment {
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fn build_display_list_for_background_if_applicable(&self,
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style: &ComputedValues,
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display_list: &mut DisplayList,
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layout_context: &LayoutContext,
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level: StackingLevel,
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absolute_bounds: &Rect<Au>,
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clip: &ClippingRegion) {
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// Adjust the clipping region as necessary to account for `border-radius`.
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let border_radii = build_border_radius(absolute_bounds, style.get_border());
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let mut clip = (*clip).clone();
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if !border_radii.is_square() {
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clip = clip.intersect_with_rounded_rect(absolute_bounds, &border_radii)
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}
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// FIXME: This causes a lot of background colors to be displayed when they are clearly not
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// needed. We could use display list optimization to clean this up, but it still seems
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// inefficient. What we really want is something like "nearest ancestor element that
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// doesn't have a fragment".
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let background_color = style.resolve_color(style.get_background().background_color);
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// 'background-clip' determines the area within which the background is painted.
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// http://dev.w3.org/csswg/css-backgrounds-3/#the-background-clip
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let mut bounds = *absolute_bounds;
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match style.get_background().background_clip {
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background_clip::T::border_box => {}
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background_clip::T::padding_box => {
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let border = style.logical_border_width().to_physical(style.writing_mode);
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bounds.origin.x = bounds.origin.x + border.left;
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bounds.origin.y = bounds.origin.y + border.top;
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bounds.size.width = bounds.size.width - border.horizontal();
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bounds.size.height = bounds.size.height - border.vertical();
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}
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background_clip::T::content_box => {
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let border_padding = self.border_padding.to_physical(style.writing_mode);
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bounds.origin.x = bounds.origin.x + border_padding.left;
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bounds.origin.y = bounds.origin.y + border_padding.top;
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bounds.size.width = bounds.size.width - border_padding.horizontal();
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bounds.size.height = bounds.size.height - border_padding.vertical();
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}
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}
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display_list.push(DisplayItem::SolidColorClass(box SolidColorDisplayItem {
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base: BaseDisplayItem::new(bounds,
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DisplayItemMetadata::new(self.node,
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style,
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Cursor::DefaultCursor),
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clip.clone()),
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color: background_color.to_gfx_color(),
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}), level);
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// The background image is painted on top of the background color.
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// Implements background image, per spec:
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// http://www.w3.org/TR/CSS21/colors.html#background
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let background = style.get_background();
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match background.background_image {
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None => {}
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Some(Image::LinearGradient(ref gradient)) => {
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self.build_display_list_for_background_linear_gradient(display_list,
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level,
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absolute_bounds,
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&clip,
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gradient,
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style)
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}
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Some(Image::Url(ref image_url)) => {
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self.build_display_list_for_background_image(style,
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display_list,
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layout_context,
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level,
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absolute_bounds,
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&clip,
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image_url)
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}
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}
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}
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fn compute_background_image_size(&self,
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style: &ComputedValues,
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bounds: &Rect<Au>,
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image: &png::Image)
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-> Size2D<Au> {
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// If `image_aspect_ratio` < `bounds_aspect_ratio`, the image is tall; otherwise, it is
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// wide.
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let image_aspect_ratio = (image.width as f64) / (image.height as f64);
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let bounds_aspect_ratio = bounds.size.width.to_f64_px() / bounds.size.height.to_f64_px();
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let intrinsic_size = Size2D::new(Au::from_px(image.width as i32),
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Au::from_px(image.height as i32));
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match (style.get_background().background_size.clone(),
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image_aspect_ratio < bounds_aspect_ratio) {
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(background_size::T::Contain, false) | (background_size::T::Cover, true) => {
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Size2D::new(bounds.size.width,
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Au::from_f64_px(bounds.size.width.to_f64_px() / image_aspect_ratio))
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}
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(background_size::T::Contain, true) | (background_size::T::Cover, false) => {
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Size2D::new(Au::from_f64_px(bounds.size.height.to_f64_px() * image_aspect_ratio),
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bounds.size.height)
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}
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(background_size::T::Explicit(background_size::ExplicitSize {
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width,
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height: LengthOrPercentageOrAuto::Auto,
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||
}), _) => {
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let width = MaybeAuto::from_style(width, bounds.size.width)
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||
.specified_or_default(intrinsic_size.width);
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Size2D::new(width, Au::from_f64_px(width.to_f64_px() / image_aspect_ratio))
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}
|
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|
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(background_size::T::Explicit(background_size::ExplicitSize {
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width: LengthOrPercentageOrAuto::Auto,
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height
|
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}), _) => {
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let height = MaybeAuto::from_style(height, bounds.size.height)
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.specified_or_default(intrinsic_size.height);
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Size2D::new(Au::from_f64_px(height.to_f64_px() * image_aspect_ratio), height)
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}
|
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(background_size::T::Explicit(background_size::ExplicitSize {
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||
width,
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||
height
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||
}), _) => {
|
||
Size2D::new(MaybeAuto::from_style(width, bounds.size.width)
|
||
.specified_or_default(intrinsic_size.width),
|
||
MaybeAuto::from_style(height, bounds.size.height)
|
||
.specified_or_default(intrinsic_size.height))
|
||
}
|
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}
|
||
}
|
||
|
||
fn build_display_list_for_background_image(&self,
|
||
style: &ComputedValues,
|
||
display_list: &mut DisplayList,
|
||
layout_context: &LayoutContext,
|
||
level: StackingLevel,
|
||
absolute_bounds: &Rect<Au>,
|
||
clip: &ClippingRegion,
|
||
image_url: &Url) {
|
||
let background = style.get_background();
|
||
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");
|
||
|
||
// Use `background-size` to get the size.
|
||
let mut bounds = *absolute_bounds;
|
||
let image_size = self.compute_background_image_size(style, &bounds, &*image);
|
||
|
||
// Clip.
|
||
//
|
||
// TODO: Check the bounds to see if a clip item is actually required.
|
||
let clip = clip.clone().intersect_rect(&bounds);
|
||
|
||
// Background image should be positioned on the padding box basis.
|
||
let border = style.logical_border_width().to_physical(style.writing_mode);
|
||
|
||
// Use 'background-origin' to get the origin value.
|
||
let (mut origin_x, mut origin_y) = match background.background_origin {
|
||
background_origin::T::padding_box => {
|
||
(Au(0), Au(0))
|
||
}
|
||
background_origin::T::border_box => {
|
||
(-border.left, -border.top)
|
||
}
|
||
background_origin::T::content_box => {
|
||
let border_padding = (self.border_padding).to_physical(self.style.writing_mode);
|
||
(border_padding.left - border.left, border_padding.top - border.top)
|
||
}
|
||
};
|
||
|
||
// Use `background-attachment` to get the initial virtual origin
|
||
let (virtual_origin_x, virtual_origin_y) = match background.background_attachment {
|
||
background_attachment::T::scroll => {
|
||
(absolute_bounds.origin.x, absolute_bounds.origin.y)
|
||
}
|
||
background_attachment::T::fixed => {
|
||
// If the ‘background-attachment’ value for this image is ‘fixed’, then
|
||
// 'background-origin' has no effect.
|
||
origin_x = Au(0);
|
||
origin_y = Au(0);
|
||
(Au(0), Au(0))
|
||
}
|
||
};
|
||
|
||
// Use `background-position` to get the offset.
|
||
let horizontal_position = model::specified(background.background_position.horizontal,
|
||
bounds.size.width - image_size.width);
|
||
let vertical_position = model::specified(background.background_position.vertical,
|
||
bounds.size.height - image_size.height);
|
||
|
||
let abs_x = border.left + virtual_origin_x + horizontal_position + origin_x;
|
||
let abs_y = border.top + virtual_origin_y + vertical_position + origin_y;
|
||
|
||
// Adjust origin and size based on background-repeat
|
||
match background.background_repeat {
|
||
background_repeat::T::no_repeat => {
|
||
bounds.origin.x = abs_x;
|
||
bounds.origin.y = abs_y;
|
||
bounds.size.width = image_size.width;
|
||
bounds.size.height = image_size.height;
|
||
}
|
||
background_repeat::T::repeat_x => {
|
||
bounds.origin.y = abs_y;
|
||
bounds.size.height = image_size.height;
|
||
ImageFragmentInfo::tile_image(&mut bounds.origin.x,
|
||
&mut bounds.size.width,
|
||
abs_x,
|
||
image_size.width.to_nearest_px() as u32);
|
||
}
|
||
background_repeat::T::repeat_y => {
|
||
bounds.origin.x = abs_x;
|
||
bounds.size.width = image_size.width;
|
||
ImageFragmentInfo::tile_image(&mut bounds.origin.y,
|
||
&mut bounds.size.height,
|
||
abs_y,
|
||
image_size.height.to_nearest_px() as u32);
|
||
}
|
||
background_repeat::T::repeat => {
|
||
ImageFragmentInfo::tile_image(&mut bounds.origin.x,
|
||
&mut bounds.size.width,
|
||
abs_x,
|
||
image_size.width.to_nearest_px() as u32);
|
||
ImageFragmentInfo::tile_image(&mut bounds.origin.y,
|
||
&mut bounds.size.height,
|
||
abs_y,
|
||
image_size.height.to_nearest_px() as u32);
|
||
}
|
||
};
|
||
|
||
// Create the image display item.
|
||
display_list.push(DisplayItem::ImageClass(box ImageDisplayItem {
|
||
base: BaseDisplayItem::new(bounds,
|
||
DisplayItemMetadata::new(self.node,
|
||
style,
|
||
Cursor::DefaultCursor),
|
||
clip),
|
||
image: image.clone(),
|
||
stretch_size: Size2D::new(image_size.width, image_size.height),
|
||
image_rendering: style.get_effects().image_rendering.clone(),
|
||
}), level);
|
||
}
|
||
}
|
||
|
||
fn build_display_list_for_background_linear_gradient(&self,
|
||
display_list: &mut DisplayList,
|
||
level: StackingLevel,
|
||
absolute_bounds: &Rect<Au>,
|
||
clip: &ClippingRegion,
|
||
gradient: &LinearGradient,
|
||
style: &ComputedValues) {
|
||
let clip = clip.clone().intersect_rect(absolute_bounds);
|
||
|
||
// This is the distance between the center and the ending point; i.e. half of the distance
|
||
// between the starting point and the ending point.
|
||
let delta = match gradient.angle_or_corner {
|
||
AngleOrCorner::Angle(angle) => {
|
||
Point2D::new(Au::from_f32_px(angle.radians().sin() *
|
||
absolute_bounds.size.width.to_f32_px() / 2.0),
|
||
Au::from_f32_px(-angle.radians().cos() *
|
||
absolute_bounds.size.height.to_f32_px() / 2.0))
|
||
}
|
||
AngleOrCorner::Corner(horizontal, vertical) => {
|
||
let x_factor = match horizontal {
|
||
HorizontalDirection::Left => -1,
|
||
HorizontalDirection::Right => 1,
|
||
};
|
||
let y_factor = match vertical {
|
||
VerticalDirection::Top => -1,
|
||
VerticalDirection::Bottom => 1,
|
||
};
|
||
Point2D::new(absolute_bounds.size.width * x_factor / 2,
|
||
absolute_bounds.size.height * y_factor / 2)
|
||
}
|
||
};
|
||
|
||
// This is the length of the gradient line.
|
||
let length = Au::from_f32_px(
|
||
(delta.x.to_f32_px() * 2.0).hypot(delta.y.to_f32_px() * 2.0));
|
||
|
||
// Determine the position of each stop per CSS-IMAGES § 3.4.
|
||
//
|
||
// FIXME(#3908, pcwalton): Make sure later stops can't be behind earlier stops.
|
||
let (mut stops, mut stop_run) = (Vec::new(), None);
|
||
for (i, stop) in gradient.stops.iter().enumerate() {
|
||
let offset = match stop.position {
|
||
None => {
|
||
if stop_run.is_none() {
|
||
// Initialize a new stop run.
|
||
let start_offset = if i == 0 {
|
||
0.0
|
||
} else {
|
||
// `unwrap()` here should never fail because this is the beginning of
|
||
// a stop run, which is always bounded by a length or percentage.
|
||
position_to_offset(gradient.stops[i - 1].position.unwrap(), length)
|
||
};
|
||
let (end_index, end_offset) =
|
||
match gradient.stops[i..]
|
||
.iter()
|
||
.enumerate()
|
||
.find(|&(_, ref stop)| stop.position.is_some()) {
|
||
None => (gradient.stops.len() - 1, 1.0),
|
||
Some((end_index, end_stop)) => {
|
||
// `unwrap()` here should never fail because this is the end of
|
||
// a stop run, which is always bounded by a length or
|
||
// percentage.
|
||
(end_index,
|
||
position_to_offset(end_stop.position.unwrap(), length))
|
||
}
|
||
};
|
||
stop_run = Some(StopRun {
|
||
start_offset: start_offset,
|
||
end_offset: end_offset,
|
||
start_index: i,
|
||
stop_count: end_index - i,
|
||
})
|
||
}
|
||
|
||
let stop_run = stop_run.unwrap();
|
||
let stop_run_length = stop_run.end_offset - stop_run.start_offset;
|
||
if stop_run.stop_count == 0 {
|
||
stop_run.end_offset
|
||
} else {
|
||
stop_run.start_offset +
|
||
stop_run_length * (i - stop_run.start_index) as f32 /
|
||
(stop_run.stop_count as f32)
|
||
}
|
||
}
|
||
Some(position) => {
|
||
stop_run = None;
|
||
position_to_offset(position, length)
|
||
}
|
||
};
|
||
stops.push(GradientStop {
|
||
offset: offset,
|
||
color: style.resolve_color(stop.color).to_gfx_color()
|
||
})
|
||
}
|
||
|
||
let center = Point2D::new(absolute_bounds.origin.x + absolute_bounds.size.width / 2,
|
||
absolute_bounds.origin.y + absolute_bounds.size.height / 2);
|
||
|
||
let gradient_display_item = DisplayItem::GradientClass(box GradientDisplayItem {
|
||
base: BaseDisplayItem::new(*absolute_bounds,
|
||
DisplayItemMetadata::new(self.node,
|
||
style,
|
||
Cursor::DefaultCursor),
|
||
clip),
|
||
start_point: center - delta,
|
||
end_point: center + delta,
|
||
stops: stops,
|
||
});
|
||
|
||
display_list.push(gradient_display_item, level)
|
||
}
|
||
|
||
fn build_display_list_for_box_shadow_if_applicable(&self,
|
||
style: &ComputedValues,
|
||
list: &mut DisplayList,
|
||
_layout_context: &LayoutContext,
|
||
level: StackingLevel,
|
||
absolute_bounds: &Rect<Au>,
|
||
clip: &ClippingRegion) {
|
||
// NB: According to CSS-BACKGROUNDS, box shadows render in *reverse* order (front to back).
|
||
for box_shadow in style.get_effects().box_shadow.iter().rev() {
|
||
let bounds = shadow_bounds(&absolute_bounds.translate(&Point2D::new(box_shadow.offset_x,
|
||
box_shadow.offset_y)),
|
||
box_shadow.blur_radius,
|
||
box_shadow.spread_radius);
|
||
list.push(DisplayItem::BoxShadowClass(box BoxShadowDisplayItem {
|
||
base: BaseDisplayItem::new(bounds,
|
||
DisplayItemMetadata::new(self.node,
|
||
style,
|
||
Cursor::DefaultCursor),
|
||
(*clip).clone()),
|
||
box_bounds: *absolute_bounds,
|
||
color: style.resolve_color(box_shadow.color).to_gfx_color(),
|
||
offset: Point2D::new(box_shadow.offset_x, box_shadow.offset_y),
|
||
blur_radius: box_shadow.blur_radius,
|
||
spread_radius: box_shadow.spread_radius,
|
||
clip_mode: if box_shadow.inset {
|
||
BoxShadowClipMode::Inset
|
||
} else {
|
||
BoxShadowClipMode::Outset
|
||
},
|
||
}), level);
|
||
}
|
||
}
|
||
|
||
fn build_display_list_for_borders_if_applicable(
|
||
&self,
|
||
style: &ComputedValues,
|
||
border_painting_mode: BorderPaintingMode,
|
||
display_list: &mut DisplayList,
|
||
bounds: &Rect<Au>,
|
||
level: StackingLevel,
|
||
clip: &ClippingRegion) {
|
||
let mut border = style.logical_border_width();
|
||
|
||
match border_painting_mode {
|
||
BorderPaintingMode::Separate => {}
|
||
BorderPaintingMode::Collapse(collapsed_borders) => {
|
||
collapsed_borders.adjust_border_widths_for_painting(&mut border)
|
||
}
|
||
BorderPaintingMode::Hidden => return,
|
||
}
|
||
if border.is_zero() {
|
||
return
|
||
}
|
||
|
||
let border_style_struct = style.get_border();
|
||
let mut colors = SideOffsets2D::new(border_style_struct.border_top_color,
|
||
border_style_struct.border_right_color,
|
||
border_style_struct.border_bottom_color,
|
||
border_style_struct.border_left_color);
|
||
let mut border_style = SideOffsets2D::new(border_style_struct.border_top_style,
|
||
border_style_struct.border_right_style,
|
||
border_style_struct.border_bottom_style,
|
||
border_style_struct.border_left_style);
|
||
if let BorderPaintingMode::Collapse(collapsed_borders) = border_painting_mode {
|
||
collapsed_borders.adjust_border_colors_and_styles_for_painting(&mut colors,
|
||
&mut border_style,
|
||
style.writing_mode);
|
||
}
|
||
|
||
let colors = SideOffsets2D::new(style.resolve_color(colors.top),
|
||
style.resolve_color(colors.right),
|
||
style.resolve_color(colors.bottom),
|
||
style.resolve_color(colors.left));
|
||
|
||
// If this border collapses, then we draw outside the boundaries we were given.
|
||
let mut bounds = *bounds;
|
||
if let BorderPaintingMode::Collapse(collapsed_borders) = border_painting_mode {
|
||
collapsed_borders.adjust_border_bounds_for_painting(&mut bounds, style.writing_mode)
|
||
}
|
||
|
||
// Append the border to the display list.
|
||
display_list.push(DisplayItem::BorderClass(box BorderDisplayItem {
|
||
base: BaseDisplayItem::new(bounds,
|
||
DisplayItemMetadata::new(self.node,
|
||
style,
|
||
Cursor::DefaultCursor),
|
||
(*clip).clone()),
|
||
border_widths: border.to_physical(style.writing_mode),
|
||
color: SideOffsets2D::new(colors.top.to_gfx_color(),
|
||
colors.right.to_gfx_color(),
|
||
colors.bottom.to_gfx_color(),
|
||
colors.left.to_gfx_color()),
|
||
style: border_style,
|
||
radius: build_border_radius(&bounds, border_style_struct),
|
||
}), level);
|
||
}
|
||
|
||
fn build_display_list_for_outline_if_applicable(&self,
|
||
style: &ComputedValues,
|
||
display_list: &mut DisplayList,
|
||
bounds: &Rect<Au>,
|
||
clip: &ClippingRegion) {
|
||
let width = style.get_outline().outline_width;
|
||
if width == Au(0) {
|
||
return
|
||
}
|
||
|
||
let outline_style = style.get_outline().outline_style;
|
||
if outline_style == border_style::T::none {
|
||
return
|
||
}
|
||
|
||
// Outlines are not accounted for in the dimensions of the border box, so adjust the
|
||
// absolute bounds.
|
||
let mut bounds = *bounds;
|
||
let offset = width + style.get_outline().outline_offset;
|
||
bounds.origin.x = bounds.origin.x - offset;
|
||
bounds.origin.y = bounds.origin.y - offset;
|
||
bounds.size.width = bounds.size.width + offset + offset;
|
||
bounds.size.height = bounds.size.height + offset + offset;
|
||
|
||
// Append the outline to the display list.
|
||
let color = style.resolve_color(style.get_outline().outline_color).to_gfx_color();
|
||
display_list.outlines.push_back(DisplayItem::BorderClass(box BorderDisplayItem {
|
||
base: BaseDisplayItem::new(bounds,
|
||
DisplayItemMetadata::new(self.node,
|
||
style,
|
||
Cursor::DefaultCursor),
|
||
(*clip).clone()),
|
||
border_widths: SideOffsets2D::new_all_same(width),
|
||
color: SideOffsets2D::new_all_same(color),
|
||
style: SideOffsets2D::new_all_same(outline_style),
|
||
radius: Default::default(),
|
||
}))
|
||
}
|
||
|
||
fn build_debug_borders_around_text_fragments(&self,
|
||
style: &ComputedValues,
|
||
display_list: &mut DisplayList,
|
||
stacking_relative_border_box: &Rect<Au>,
|
||
stacking_relative_content_box: &Rect<Au>,
|
||
text_fragment: &ScannedTextFragmentInfo,
|
||
clip: &ClippingRegion) {
|
||
// FIXME(pcwalton, #2795): Get the real container size.
|
||
let container_size = Size2D::zero();
|
||
|
||
// Compute the text fragment bounds and draw a border surrounding them.
|
||
display_list.content.push_back(DisplayItem::BorderClass(box BorderDisplayItem {
|
||
base: BaseDisplayItem::new(*stacking_relative_border_box,
|
||
DisplayItemMetadata::new(self.node,
|
||
style,
|
||
Cursor::DefaultCursor),
|
||
(*clip).clone()),
|
||
border_widths: SideOffsets2D::new_all_same(Au::from_px(1)),
|
||
color: SideOffsets2D::new_all_same(color::rgb(0, 0, 200)),
|
||
style: SideOffsets2D::new_all_same(border_style::T::solid),
|
||
radius: Default::default(),
|
||
}));
|
||
|
||
// Draw a rectangle representing the baselines.
|
||
let mut baseline = LogicalRect::from_physical(self.style.writing_mode,
|
||
*stacking_relative_content_box,
|
||
container_size);
|
||
baseline.start.b = baseline.start.b + text_fragment.run.ascent();
|
||
baseline.size.block = Au(0);
|
||
let baseline = baseline.to_physical(self.style.writing_mode, container_size);
|
||
|
||
let line_display_item = box LineDisplayItem {
|
||
base: BaseDisplayItem::new(baseline,
|
||
DisplayItemMetadata::new(self.node, style, Cursor::DefaultCursor),
|
||
(*clip).clone()),
|
||
color: color::rgb(0, 200, 0),
|
||
style: border_style::T::dashed,
|
||
};
|
||
display_list.content.push_back(DisplayItem::LineClass(line_display_item));
|
||
}
|
||
|
||
fn build_debug_borders_around_fragment(&self,
|
||
display_list: &mut DisplayList,
|
||
stacking_relative_border_box: &Rect<Au>,
|
||
clip: &ClippingRegion) {
|
||
// This prints a debug border around the border of this fragment.
|
||
display_list.content.push_back(DisplayItem::BorderClass(box BorderDisplayItem {
|
||
base: BaseDisplayItem::new(*stacking_relative_border_box,
|
||
DisplayItemMetadata::new(self.node,
|
||
&*self.style,
|
||
Cursor::DefaultCursor),
|
||
(*clip).clone()),
|
||
border_widths: SideOffsets2D::new_all_same(Au::from_px(1)),
|
||
color: SideOffsets2D::new_all_same(color::rgb(0, 0, 200)),
|
||
style: SideOffsets2D::new_all_same(border_style::T::solid),
|
||
radius: Default::default(),
|
||
}));
|
||
}
|
||
|
||
fn calculate_style_specified_clip(&self,
|
||
parent_clip: &ClippingRegion,
|
||
stacking_relative_border_box: &Rect<Au>)
|
||
-> ClippingRegion {
|
||
// Account for `clip` per CSS 2.1 § 11.1.2.
|
||
let style_clip_rect = match (self.style().get_box().position,
|
||
self.style().get_effects().clip) {
|
||
(position::T::absolute, Some(style_clip_rect)) => style_clip_rect,
|
||
_ => return (*parent_clip).clone(),
|
||
};
|
||
|
||
// FIXME(pcwalton, #2795): Get the real container size.
|
||
let clip_origin = Point2D::new(stacking_relative_border_box.origin.x + style_clip_rect.left,
|
||
stacking_relative_border_box.origin.y + style_clip_rect.top);
|
||
let right = style_clip_rect.right.unwrap_or(stacking_relative_border_box.size.width);
|
||
let bottom = style_clip_rect.bottom.unwrap_or(stacking_relative_border_box.size.height);
|
||
let clip_size = Size2D::new(right - clip_origin.x, bottom - clip_origin.y);
|
||
(*parent_clip).clone().intersect_rect(&Rect::new(clip_origin, clip_size))
|
||
}
|
||
|
||
fn build_display_list(&mut self,
|
||
display_list: &mut DisplayList,
|
||
layout_context: &LayoutContext,
|
||
stacking_relative_flow_origin: &Point2D<Au>,
|
||
relative_containing_block_size: &LogicalSize<Au>,
|
||
relative_containing_block_mode: WritingMode,
|
||
border_painting_mode: BorderPaintingMode,
|
||
background_and_border_level: BackgroundAndBorderLevel,
|
||
clip: &ClippingRegion,
|
||
stacking_relative_display_port: &Rect<Au>) {
|
||
if self.style().get_inheritedbox().visibility != visibility::T::visible {
|
||
return
|
||
}
|
||
|
||
// Compute the fragment position relative to the parent stacking context. If the fragment
|
||
// itself establishes a stacking context, then the origin of its position will be (0, 0)
|
||
// for the purposes of this computation.
|
||
let stacking_relative_border_box =
|
||
self.stacking_relative_border_box(stacking_relative_flow_origin,
|
||
relative_containing_block_size,
|
||
relative_containing_block_mode,
|
||
CoordinateSystem::Own);
|
||
|
||
debug!("Fragment::build_display_list at rel={:?}, abs={:?}, dirty={:?}, flow origin={:?}: \
|
||
{:?}",
|
||
self.border_box,
|
||
stacking_relative_border_box,
|
||
layout_context.shared.dirty,
|
||
stacking_relative_flow_origin,
|
||
self);
|
||
|
||
if !stacking_relative_border_box.intersects(stacking_relative_display_port) {
|
||
debug!("Fragment::build_display_list: outside display port");
|
||
return
|
||
}
|
||
|
||
if !stacking_relative_border_box.intersects(&layout_context.shared.dirty) {
|
||
debug!("Fragment::build_display_list: Did not intersect...");
|
||
return
|
||
}
|
||
|
||
// Calculate the clip rect. If there's nothing to render at all, don't even construct
|
||
// display list items.
|
||
let clip = self.calculate_style_specified_clip(clip, &stacking_relative_border_box);
|
||
if !clip.might_intersect_rect(&stacking_relative_border_box) {
|
||
return;
|
||
}
|
||
|
||
debug!("Fragment::build_display_list: intersected. Adding display item...");
|
||
|
||
if self.is_primary_fragment() {
|
||
let level =
|
||
StackingLevel::from_background_and_border_level(background_and_border_level);
|
||
|
||
// Add shadows, background, borders, and outlines, if applicable.
|
||
if let Some(ref inline_context) = self.inline_context {
|
||
for node in inline_context.nodes.iter().rev() {
|
||
self.build_display_list_for_box_shadow_if_applicable(
|
||
&*node.style,
|
||
display_list,
|
||
layout_context,
|
||
level,
|
||
&stacking_relative_border_box,
|
||
&clip);
|
||
self.build_display_list_for_background_if_applicable(
|
||
&*node.style,
|
||
display_list,
|
||
layout_context,
|
||
level,
|
||
&stacking_relative_border_box,
|
||
&clip);
|
||
self.build_display_list_for_borders_if_applicable(
|
||
&*node.style,
|
||
border_painting_mode,
|
||
display_list,
|
||
&stacking_relative_border_box,
|
||
level,
|
||
&clip);
|
||
self.build_display_list_for_outline_if_applicable(
|
||
&*node.style,
|
||
display_list,
|
||
&stacking_relative_border_box,
|
||
&clip);
|
||
}
|
||
}
|
||
if !self.is_scanned_text_fragment() {
|
||
self.build_display_list_for_box_shadow_if_applicable(&*self.style,
|
||
display_list,
|
||
layout_context,
|
||
level,
|
||
&stacking_relative_border_box,
|
||
&clip);
|
||
self.build_display_list_for_background_if_applicable(&*self.style,
|
||
display_list,
|
||
layout_context,
|
||
level,
|
||
&stacking_relative_border_box,
|
||
&clip);
|
||
self.build_display_list_for_borders_if_applicable(&*self.style,
|
||
border_painting_mode,
|
||
display_list,
|
||
&stacking_relative_border_box,
|
||
level,
|
||
&clip);
|
||
self.build_display_list_for_outline_if_applicable(&*self.style,
|
||
display_list,
|
||
&stacking_relative_border_box,
|
||
&clip);
|
||
}
|
||
}
|
||
|
||
// Create special per-fragment-type display items.
|
||
self.build_fragment_type_specific_display_items(display_list,
|
||
&stacking_relative_border_box,
|
||
&clip);
|
||
|
||
if opts::get().show_debug_fragment_borders {
|
||
self.build_debug_borders_around_fragment(display_list,
|
||
&stacking_relative_border_box,
|
||
&clip)
|
||
}
|
||
|
||
// If this is an iframe, then send its position and size up to the constellation.
|
||
//
|
||
// FIXME(pcwalton): Doing this during display list construction seems potentially
|
||
// problematic if iframes are outside the area we're computing the display list for, since
|
||
// they won't be able to reflow at all until the user scrolls to them. Perhaps we should
|
||
// separate this into two parts: first we should send the size only to the constellation
|
||
// once that's computed during assign-block-sizes, and second we should should send the
|
||
// origin to the constellation here during display list construction. This should work
|
||
// because layout for the iframe only needs to know size, and origin is only relevant if
|
||
// the iframe is actually going to be displayed.
|
||
if let SpecificFragmentInfo::Iframe(ref iframe_fragment) = self.specific {
|
||
self.finalize_position_and_size_of_iframe(&**iframe_fragment,
|
||
stacking_relative_border_box.origin,
|
||
layout_context)
|
||
}
|
||
}
|
||
|
||
fn build_fragment_type_specific_display_items(&mut self,
|
||
display_list: &mut DisplayList,
|
||
stacking_relative_border_box: &Rect<Au>,
|
||
clip: &ClippingRegion) {
|
||
// Compute the context box position relative to the parent stacking context.
|
||
let stacking_relative_content_box =
|
||
self.stacking_relative_content_box(stacking_relative_border_box);
|
||
|
||
match self.specific {
|
||
SpecificFragmentInfo::ScannedText(ref text_fragment) => {
|
||
// Create items for shadows.
|
||
//
|
||
// NB: According to CSS-BACKGROUNDS, text shadows render in *reverse* order (front
|
||
// to back).
|
||
let text_color = self.style().get_color().color;
|
||
for text_shadow in self.style.get_effects().text_shadow.0.iter().rev() {
|
||
let offset = &Point2D::new(text_shadow.offset_x, text_shadow.offset_y);
|
||
let color = self.style().resolve_color(text_shadow.color);
|
||
self.build_display_list_for_text_fragment(display_list,
|
||
&**text_fragment,
|
||
color,
|
||
&stacking_relative_content_box,
|
||
Some(text_shadow.blur_radius),
|
||
offset,
|
||
clip);
|
||
}
|
||
|
||
// Create the main text display item.
|
||
self.build_display_list_for_text_fragment(display_list,
|
||
&**text_fragment,
|
||
text_color,
|
||
&stacking_relative_content_box,
|
||
None,
|
||
&Point2D::new(Au(0), Au(0)),
|
||
clip);
|
||
|
||
if opts::get().show_debug_fragment_borders {
|
||
self.build_debug_borders_around_text_fragments(self.style(),
|
||
display_list,
|
||
stacking_relative_border_box,
|
||
&stacking_relative_content_box,
|
||
&**text_fragment,
|
||
clip)
|
||
}
|
||
}
|
||
SpecificFragmentInfo::Generic |
|
||
SpecificFragmentInfo::GeneratedContent(..) |
|
||
SpecificFragmentInfo::Iframe(..) |
|
||
SpecificFragmentInfo::Table |
|
||
SpecificFragmentInfo::TableCell |
|
||
SpecificFragmentInfo::TableRow |
|
||
SpecificFragmentInfo::TableWrapper |
|
||
SpecificFragmentInfo::InlineBlock(_) |
|
||
SpecificFragmentInfo::InlineAbsoluteHypothetical(_) |
|
||
SpecificFragmentInfo::InlineAbsolute(_) => {
|
||
if opts::get().show_debug_fragment_borders {
|
||
self.build_debug_borders_around_fragment(display_list,
|
||
stacking_relative_border_box,
|
||
clip);
|
||
}
|
||
}
|
||
SpecificFragmentInfo::Image(ref mut image_fragment) => {
|
||
// Place the image into the display list.
|
||
if let Some(ref image) = image_fragment.image {
|
||
display_list.content.push_back(DisplayItem::ImageClass(box ImageDisplayItem {
|
||
base: BaseDisplayItem::new(stacking_relative_content_box,
|
||
DisplayItemMetadata::new(self.node,
|
||
&*self.style,
|
||
Cursor::DefaultCursor),
|
||
(*clip).clone()),
|
||
image: image.clone(),
|
||
stretch_size: stacking_relative_content_box.size,
|
||
image_rendering: self.style.get_effects().image_rendering.clone(),
|
||
}));
|
||
}
|
||
}
|
||
SpecificFragmentInfo::Canvas(ref canvas_fragment_info) => {
|
||
// TODO(ecoal95): make the canvas with a renderer use the custom layer
|
||
let width = canvas_fragment_info.replaced_image_fragment_info
|
||
.computed_inline_size.map_or(0, |w| w.to_px() as usize);
|
||
let height = canvas_fragment_info.replaced_image_fragment_info
|
||
.computed_block_size.map_or(0, |h| h.to_px() as usize);
|
||
let (sender, receiver) = channel::<Vec<u8>>();
|
||
let canvas_data = match canvas_fragment_info.renderer {
|
||
Some(ref renderer) => {
|
||
renderer.lock().unwrap().send(CanvasMsg::Common(
|
||
CanvasCommonMsg::SendPixelContents(sender))).unwrap();
|
||
receiver.recv().unwrap()
|
||
},
|
||
None => repeat(0xFFu8).take(width * height * 4).collect(),
|
||
};
|
||
display_list.content.push_back(DisplayItem::ImageClass(box ImageDisplayItem{
|
||
base: BaseDisplayItem::new(stacking_relative_content_box,
|
||
DisplayItemMetadata::new(self.node,
|
||
&*self.style,
|
||
Cursor::DefaultCursor),
|
||
(*clip).clone()),
|
||
image: Arc::new(png::Image {
|
||
width: width as u32,
|
||
height: height as u32,
|
||
pixels: PixelsByColorType::RGBA8(canvas_data),
|
||
}),
|
||
stretch_size: stacking_relative_content_box.size,
|
||
image_rendering: image_rendering::T::Auto,
|
||
}));
|
||
}
|
||
SpecificFragmentInfo::UnscannedText(_) => {
|
||
panic!("Shouldn't see unscanned fragments here.")
|
||
}
|
||
SpecificFragmentInfo::TableColumn(_) => {
|
||
panic!("Shouldn't see table column fragments here.")
|
||
}
|
||
}
|
||
}
|
||
|
||
fn create_stacking_context(&self,
|
||
base_flow: &BaseFlow,
|
||
display_list: Box<DisplayList>,
|
||
layout_context: &LayoutContext,
|
||
layer: StackingContextLayer)
|
||
-> Arc<StackingContext> {
|
||
let border_box = self.stacking_relative_border_box(&base_flow.stacking_relative_position,
|
||
&base_flow.absolute_position_info
|
||
.relative_containing_block_size,
|
||
base_flow.absolute_position_info
|
||
.relative_containing_block_mode,
|
||
CoordinateSystem::Parent);
|
||
|
||
let mut transform = Matrix4::identity();
|
||
|
||
if let Some(ref operations) = self.style().get_effects().transform {
|
||
let transform_origin = self.style().get_effects().transform_origin;
|
||
let transform_origin =
|
||
Point3D::new(model::specified(transform_origin.horizontal,
|
||
border_box.size.width).to_f32_px(),
|
||
model::specified(transform_origin.vertical,
|
||
border_box.size.height).to_f32_px(),
|
||
transform_origin.depth.to_f32_px());
|
||
|
||
let pre_transform = Matrix4::create_translation(transform_origin.x,
|
||
transform_origin.y,
|
||
transform_origin.z);
|
||
let post_transform = Matrix4::create_translation(-transform_origin.x,
|
||
-transform_origin.y,
|
||
-transform_origin.z);
|
||
|
||
for operation in operations {
|
||
let matrix = match operation {
|
||
&transform::ComputedOperation::Rotate(ax, ay, az, theta) => {
|
||
let theta = f32::consts::PI_2 - theta.radians();
|
||
Matrix4::create_rotation(ax, ay, az, theta)
|
||
}
|
||
&transform::ComputedOperation::Perspective(d) => {
|
||
Matrix4::create_perspective(d.to_f32_px())
|
||
}
|
||
&transform::ComputedOperation::Scale(sx, sy, sz) => {
|
||
Matrix4::create_scale(sx, sy, sz)
|
||
}
|
||
&transform::ComputedOperation::Translate(tx, ty, tz) => {
|
||
let tx = tx.to_au(border_box.size.width).to_f32_px();
|
||
let ty = ty.to_au(border_box.size.height).to_f32_px();
|
||
let tz = tz.to_f32_px();
|
||
Matrix4::create_translation(tx, ty, tz)
|
||
}
|
||
&transform::ComputedOperation::Matrix(m) => {
|
||
m.to_gfx_matrix()
|
||
}
|
||
&transform::ComputedOperation::Skew(sx, sy) => {
|
||
Matrix4::create_skew(sx, sy)
|
||
}
|
||
};
|
||
|
||
transform = transform.mul(&matrix);
|
||
}
|
||
|
||
transform = pre_transform.mul(&transform).mul(&post_transform);
|
||
}
|
||
|
||
let perspective = match self.style().get_effects().perspective {
|
||
LengthOrNone::Length(d) => {
|
||
let perspective_origin = self.style().get_effects().perspective_origin;
|
||
let perspective_origin =
|
||
Point2D::new(model::specified(perspective_origin.horizontal,
|
||
border_box.size.width).to_f32_px(),
|
||
model::specified(perspective_origin.vertical,
|
||
border_box.size.height).to_f32_px());
|
||
|
||
let pre_transform = Matrix4::create_translation(perspective_origin.x,
|
||
perspective_origin.y,
|
||
0.0);
|
||
let post_transform = Matrix4::create_translation(-perspective_origin.x,
|
||
-perspective_origin.y,
|
||
0.0);
|
||
|
||
let perspective_matrix = Matrix4::create_perspective(d.to_f32_px());
|
||
|
||
pre_transform.mul(&perspective_matrix).mul(&post_transform)
|
||
}
|
||
LengthOrNone::None => {
|
||
Matrix4::identity()
|
||
}
|
||
};
|
||
|
||
// FIXME(pcwalton): Is this vertical-writing-direction-safe?
|
||
let margin = self.margin.to_physical(base_flow.writing_mode);
|
||
let overflow = base_flow.overflow.translate(&-Point2D::new(margin.left, Au(0)));
|
||
|
||
// Create the filter pipeline.
|
||
let effects = self.style().get_effects();
|
||
let mut filters = effects.filter.clone();
|
||
if effects.opacity != 1.0 {
|
||
filters.push(Filter::Opacity(effects.opacity))
|
||
}
|
||
|
||
// Ensure every canvas has a layer
|
||
let layer = match layer {
|
||
StackingContextLayer::Existing(existing_layer) => Some(existing_layer),
|
||
StackingContextLayer::IfCanvas(layer_id) => {
|
||
if let SpecificFragmentInfo::Canvas(_) = self.specific {
|
||
Some(PaintLayer::new(layer_id, color::transparent(), ScrollPolicy::Scrollable))
|
||
} else {
|
||
None
|
||
}
|
||
}
|
||
};
|
||
|
||
// If it's a canvas we must propagate the layer and the renderer to the paint
|
||
// task
|
||
if let SpecificFragmentInfo::Canvas(ref fragment_info) = self.specific {
|
||
let layer_id = layer.as_ref().unwrap().id;
|
||
layout_context.shared.canvas_layers_sender
|
||
.send((layer_id, fragment_info.renderer.clone())).unwrap();
|
||
}
|
||
|
||
let transform_style = self.style().get_used_transform_style();
|
||
let layer = layer.map(|l| Arc::new(l));
|
||
|
||
Arc::new(StackingContext::new(display_list,
|
||
&border_box,
|
||
&overflow,
|
||
self.style().get_box().z_index.number_or_zero(),
|
||
filters,
|
||
self.style().get_effects().mix_blend_mode,
|
||
layer,
|
||
transform,
|
||
perspective,
|
||
transform_style == transform_style::T::flat))
|
||
}
|
||
|
||
#[inline(never)]
|
||
fn finalize_position_and_size_of_iframe(&self,
|
||
iframe_fragment: &IframeFragmentInfo,
|
||
offset: Point2D<Au>,
|
||
layout_context: &LayoutContext) {
|
||
let border_padding = (self.border_padding).to_physical(self.style.writing_mode);
|
||
let content_size = self.content_box().size.to_physical(self.style.writing_mode);
|
||
let iframe_rect = Rect::new(Point2D::new((offset.x + border_padding.left).to_f32_px(),
|
||
(offset.y + border_padding.top).to_f32_px()),
|
||
Size2D::new(content_size.width.to_f32_px(),
|
||
content_size.height.to_f32_px()));
|
||
|
||
debug!("finalizing position and size of iframe for {:?},{:?}",
|
||
iframe_fragment.pipeline_id,
|
||
iframe_fragment.subpage_id);
|
||
let ConstellationChan(ref chan) = layout_context.shared.constellation_chan;
|
||
chan.send(ConstellationMsg::FrameRect(iframe_fragment.pipeline_id,
|
||
iframe_fragment.subpage_id,
|
||
iframe_rect)).unwrap();
|
||
}
|
||
|
||
fn clipping_region_for_children(&self,
|
||
current_clip: &ClippingRegion,
|
||
stacking_relative_border_box: &Rect<Au>)
|
||
-> ClippingRegion {
|
||
// Don't clip if we're text.
|
||
if self.is_scanned_text_fragment() {
|
||
return (*current_clip).clone()
|
||
}
|
||
|
||
// Account for style-specified `clip`.
|
||
let mut current_clip = self.calculate_style_specified_clip(current_clip,
|
||
stacking_relative_border_box);
|
||
|
||
// Clip according to the values of `overflow-x` and `overflow-y`.
|
||
//
|
||
// TODO(pcwalton): Support scrolling.
|
||
// FIXME(pcwalton): This may be more complex than it needs to be, since it seems to be
|
||
// impossible with the computed value rules as they are to have `overflow-x: visible` with
|
||
// `overflow-y: <scrolling>` or vice versa!
|
||
match self.style.get_box().overflow_x {
|
||
overflow_x::T::hidden | overflow_x::T::auto | overflow_x::T::scroll => {
|
||
let mut bounds = current_clip.bounding_rect();
|
||
let max_x = cmp::min(bounds.max_x(), stacking_relative_border_box.max_x());
|
||
bounds.origin.x = cmp::max(bounds.origin.x, stacking_relative_border_box.origin.x);
|
||
bounds.size.width = max_x - bounds.origin.x;
|
||
current_clip = current_clip.intersect_rect(&bounds)
|
||
}
|
||
_ => {}
|
||
}
|
||
match self.style.get_box().overflow_y.0 {
|
||
overflow_x::T::hidden | overflow_x::T::auto | overflow_x::T::scroll => {
|
||
let mut bounds = current_clip.bounding_rect();
|
||
let max_y = cmp::min(bounds.max_y(), stacking_relative_border_box.max_y());
|
||
bounds.origin.y = cmp::max(bounds.origin.y, stacking_relative_border_box.origin.y);
|
||
bounds.size.height = max_y - bounds.origin.y;
|
||
current_clip = current_clip.intersect_rect(&bounds)
|
||
}
|
||
_ => {}
|
||
}
|
||
|
||
current_clip
|
||
}
|
||
|
||
fn build_display_list_for_text_fragment(&self,
|
||
display_list: &mut DisplayList,
|
||
text_fragment: &ScannedTextFragmentInfo,
|
||
text_color: RGBA,
|
||
stacking_relative_content_box: &Rect<Au>,
|
||
shadow_blur_radius: Option<Au>,
|
||
offset: &Point2D<Au>,
|
||
clip: &ClippingRegion) {
|
||
// Determine the orientation and cursor to use.
|
||
let (orientation, cursor) = if self.style.writing_mode.is_vertical() {
|
||
if self.style.writing_mode.is_sideways_left() {
|
||
(TextOrientation::SidewaysLeft, Cursor::VerticalTextCursor)
|
||
} else {
|
||
(TextOrientation::SidewaysRight, Cursor::VerticalTextCursor)
|
||
}
|
||
} else {
|
||
(TextOrientation::Upright, Cursor::TextCursor)
|
||
};
|
||
|
||
// Compute location of the baseline.
|
||
//
|
||
// FIXME(pcwalton): Get the real container size.
|
||
let container_size = Size2D::zero();
|
||
let metrics = &text_fragment.run.font_metrics;
|
||
let stacking_relative_content_box = stacking_relative_content_box.translate(offset);
|
||
let baseline_origin = stacking_relative_content_box.origin +
|
||
LogicalPoint::new(self.style.writing_mode,
|
||
Au(0),
|
||
metrics.ascent).to_physical(self.style.writing_mode,
|
||
container_size);
|
||
|
||
// Create the text display item.
|
||
display_list.content.push_back(DisplayItem::TextClass(box TextDisplayItem {
|
||
base: BaseDisplayItem::new(stacking_relative_content_box,
|
||
DisplayItemMetadata::new(self.node, self.style(), cursor),
|
||
(*clip).clone()),
|
||
text_run: text_fragment.run.clone(),
|
||
range: text_fragment.range,
|
||
text_color: text_color.to_gfx_color(),
|
||
orientation: orientation,
|
||
baseline_origin: baseline_origin,
|
||
blur_radius: shadow_blur_radius.unwrap_or(Au(0)),
|
||
}));
|
||
|
||
// Create display items for text decorations.
|
||
let mut text_decorations = self.style()
|
||
.get_inheritedtext()
|
||
._servo_text_decorations_in_effect;
|
||
if shadow_blur_radius.is_some() {
|
||
// If we're painting a shadow, paint the decorations the same color as the shadow.
|
||
text_decorations.underline = text_decorations.underline.map(|_| text_color);
|
||
text_decorations.overline = text_decorations.overline.map(|_| text_color);
|
||
text_decorations.line_through = text_decorations.line_through.map(|_| text_color);
|
||
}
|
||
|
||
let stacking_relative_content_box =
|
||
LogicalRect::from_physical(self.style.writing_mode,
|
||
stacking_relative_content_box,
|
||
container_size);
|
||
if let Some(ref underline_color) = text_decorations.underline {
|
||
let mut stacking_relative_box = stacking_relative_content_box;
|
||
stacking_relative_box.start.b = stacking_relative_content_box.start.b +
|
||
metrics.ascent - metrics.underline_offset;
|
||
stacking_relative_box.size.block = metrics.underline_size;
|
||
self.build_display_list_for_text_decoration(display_list,
|
||
underline_color,
|
||
&stacking_relative_box,
|
||
clip,
|
||
shadow_blur_radius.unwrap_or(Au(0)))
|
||
}
|
||
|
||
if let Some(ref overline_color) = text_decorations.overline {
|
||
let mut stacking_relative_box = stacking_relative_content_box;
|
||
stacking_relative_box.size.block = metrics.underline_size;
|
||
self.build_display_list_for_text_decoration(display_list,
|
||
overline_color,
|
||
&stacking_relative_box,
|
||
clip,
|
||
shadow_blur_radius.unwrap_or(Au(0)))
|
||
}
|
||
|
||
if let Some(ref line_through_color) = text_decorations.line_through {
|
||
let mut stacking_relative_box = stacking_relative_content_box;
|
||
stacking_relative_box.start.b = stacking_relative_box.start.b + metrics.ascent -
|
||
metrics.strikeout_offset;
|
||
stacking_relative_box.size.block = metrics.strikeout_size;
|
||
self.build_display_list_for_text_decoration(display_list,
|
||
line_through_color,
|
||
&stacking_relative_box,
|
||
clip,
|
||
shadow_blur_radius.unwrap_or(Au(0)))
|
||
}
|
||
}
|
||
|
||
fn build_display_list_for_text_decoration(&self,
|
||
display_list: &mut DisplayList,
|
||
color: &RGBA,
|
||
stacking_relative_box: &LogicalRect<Au>,
|
||
clip: &ClippingRegion,
|
||
blur_radius: Au) {
|
||
// Perhaps surprisingly, text decorations are box shadows. This is because they may need
|
||
// to have blur in the case of `text-shadow`, and this doesn't hurt performance because box
|
||
// shadows are optimized into essentially solid colors if there is no need for the blur.
|
||
//
|
||
// FIXME(pcwalton, #2795): Get the real container size.
|
||
let container_size = Size2D::zero();
|
||
let stacking_relative_box = stacking_relative_box.to_physical(self.style.writing_mode,
|
||
container_size);
|
||
let metadata = DisplayItemMetadata::new(self.node, &*self.style, Cursor::DefaultCursor);
|
||
display_list.content.push_back(DisplayItem::BoxShadowClass(box BoxShadowDisplayItem {
|
||
base: BaseDisplayItem::new(shadow_bounds(&stacking_relative_box, blur_radius, Au(0)),
|
||
metadata,
|
||
(*clip).clone()),
|
||
box_bounds: stacking_relative_box,
|
||
color: color.to_gfx_color(),
|
||
offset: ZERO_POINT,
|
||
blur_radius: blur_radius,
|
||
spread_radius: Au(0),
|
||
clip_mode: BoxShadowClipMode::None,
|
||
}))
|
||
}
|
||
}
|
||
|
||
pub trait BlockFlowDisplayListBuilding {
|
||
fn build_display_list_for_block_base(&mut self,
|
||
display_list: &mut DisplayList,
|
||
layout_context: &LayoutContext,
|
||
border_painting_mode: BorderPaintingMode,
|
||
background_border_level: BackgroundAndBorderLevel);
|
||
fn build_display_list_for_static_block(&mut self,
|
||
display_list: Box<DisplayList>,
|
||
layout_context: &LayoutContext,
|
||
border_painting_mode: BorderPaintingMode,
|
||
background_border_level: BackgroundAndBorderLevel);
|
||
fn build_display_list_for_absolutely_positioned_block(
|
||
&mut self,
|
||
display_list: Box<DisplayList>,
|
||
layout_context: &LayoutContext,
|
||
border_painting_mode: BorderPaintingMode);
|
||
fn build_display_list_for_floating_block(&mut self,
|
||
display_list: Box<DisplayList>,
|
||
layout_context: &LayoutContext,
|
||
border_painting_mode: BorderPaintingMode);
|
||
fn build_display_list_for_block(&mut self,
|
||
display_list: Box<DisplayList>,
|
||
layout_context: &LayoutContext,
|
||
border_painting_mode: BorderPaintingMode);
|
||
fn will_get_layer(&self) -> bool;
|
||
}
|
||
|
||
impl BlockFlowDisplayListBuilding for BlockFlow {
|
||
fn build_display_list_for_block_base(&mut self,
|
||
display_list: &mut DisplayList,
|
||
layout_context: &LayoutContext,
|
||
border_painting_mode: BorderPaintingMode,
|
||
background_border_level: BackgroundAndBorderLevel) {
|
||
// Add the box that starts the block context.
|
||
let clip = if self.fragment.establishes_stacking_context() {
|
||
self.base.clip.translate(&-self.base.stacking_relative_position)
|
||
} else {
|
||
self.base.clip.clone()
|
||
};
|
||
self.fragment
|
||
.build_display_list(display_list,
|
||
layout_context,
|
||
&self.base.stacking_relative_position,
|
||
&self.base.absolute_position_info.relative_containing_block_size,
|
||
self.base.absolute_position_info.relative_containing_block_mode,
|
||
border_painting_mode,
|
||
background_border_level,
|
||
&clip,
|
||
&self.base.stacking_relative_position_of_display_port);
|
||
|
||
// Add children.
|
||
for kid in self.base.children.iter_mut() {
|
||
flow::mut_base(kid).display_list_building_result.add_to(display_list);
|
||
}
|
||
|
||
self.base.build_display_items_for_debugging_tint(display_list, self.fragment.node);
|
||
}
|
||
|
||
fn build_display_list_for_static_block(&mut self,
|
||
mut display_list: Box<DisplayList>,
|
||
layout_context: &LayoutContext,
|
||
border_painting_mode: BorderPaintingMode,
|
||
background_border_level: BackgroundAndBorderLevel) {
|
||
self.build_display_list_for_block_base(&mut *display_list,
|
||
layout_context,
|
||
border_painting_mode,
|
||
background_border_level);
|
||
|
||
self.base.display_list_building_result = if self.fragment.establishes_stacking_context() {
|
||
if self.will_get_layer() {
|
||
// If we got here, then we need a new layer.
|
||
let scroll_policy = if self.is_fixed() {
|
||
ScrollPolicy::FixedPosition
|
||
} else {
|
||
ScrollPolicy::Scrollable
|
||
};
|
||
|
||
let paint_layer = PaintLayer::new(self.layer_id(0), color::transparent(), scroll_policy);
|
||
let layer = StackingContextLayer::Existing(paint_layer);
|
||
let stacking_context = self.fragment.create_stacking_context(&self.base,
|
||
display_list,
|
||
layout_context,
|
||
layer);
|
||
DisplayListBuildingResult::StackingContext(stacking_context)
|
||
} else {
|
||
DisplayListBuildingResult::StackingContext(
|
||
self.fragment.create_stacking_context(&self.base,
|
||
display_list,
|
||
layout_context,
|
||
StackingContextLayer::IfCanvas(self.layer_id(0))))
|
||
}
|
||
} else {
|
||
match self.fragment.style.get_box().position {
|
||
position::T::static_ => {}
|
||
_ => {
|
||
display_list.form_pseudo_stacking_context_for_positioned_content();
|
||
}
|
||
}
|
||
DisplayListBuildingResult::Normal(display_list)
|
||
}
|
||
}
|
||
|
||
fn will_get_layer(&self) -> bool {
|
||
self.base.absolute_position_info.layers_needed_for_positioned_flows ||
|
||
self.base.flags.contains(NEEDS_LAYER)
|
||
}
|
||
|
||
fn build_display_list_for_absolutely_positioned_block(
|
||
&mut self,
|
||
mut display_list: Box<DisplayList>,
|
||
layout_context: &LayoutContext,
|
||
border_painting_mode: BorderPaintingMode) {
|
||
self.build_display_list_for_block_base(&mut *display_list,
|
||
layout_context,
|
||
border_painting_mode,
|
||
BackgroundAndBorderLevel::RootOfStackingContext);
|
||
|
||
if !self.will_get_layer() {
|
||
// We didn't need a layer.
|
||
self.base.display_list_building_result =
|
||
DisplayListBuildingResult::StackingContext(
|
||
self.fragment.create_stacking_context(&self.base,
|
||
display_list,
|
||
layout_context,
|
||
StackingContextLayer::IfCanvas(self.layer_id(0))));
|
||
return
|
||
}
|
||
|
||
// If we got here, then we need a new layer.
|
||
let scroll_policy = if self.is_fixed() {
|
||
ScrollPolicy::FixedPosition
|
||
} else {
|
||
ScrollPolicy::Scrollable
|
||
};
|
||
|
||
let paint_layer = PaintLayer::new(self.layer_id(0), color::transparent(), scroll_policy);
|
||
let stacking_context = self.fragment.create_stacking_context(&self.base,
|
||
display_list,
|
||
layout_context,
|
||
StackingContextLayer::Existing(paint_layer));
|
||
self.base.display_list_building_result =
|
||
DisplayListBuildingResult::StackingContext(stacking_context)
|
||
}
|
||
|
||
fn build_display_list_for_floating_block(&mut self,
|
||
mut display_list: Box<DisplayList>,
|
||
layout_context: &LayoutContext,
|
||
border_painting_mode: BorderPaintingMode) {
|
||
self.build_display_list_for_block_base(&mut *display_list,
|
||
layout_context,
|
||
border_painting_mode,
|
||
BackgroundAndBorderLevel::RootOfStackingContext);
|
||
display_list.form_float_pseudo_stacking_context();
|
||
|
||
self.base.display_list_building_result = if self.fragment.establishes_stacking_context() {
|
||
DisplayListBuildingResult::StackingContext(
|
||
self.fragment.create_stacking_context(&self.base,
|
||
display_list,
|
||
layout_context,
|
||
StackingContextLayer::IfCanvas(self.layer_id(0))))
|
||
} else {
|
||
DisplayListBuildingResult::Normal(display_list)
|
||
}
|
||
}
|
||
|
||
fn build_display_list_for_block(&mut self,
|
||
display_list: Box<DisplayList>,
|
||
layout_context: &LayoutContext,
|
||
border_painting_mode: BorderPaintingMode) {
|
||
if self.base.flags.is_float() {
|
||
// TODO(#2009, pcwalton): This is a pseudo-stacking context. We need to merge `z-index:
|
||
// auto` kids into the parent stacking context, when that is supported.
|
||
self.build_display_list_for_floating_block(display_list,
|
||
layout_context,
|
||
border_painting_mode);
|
||
} else if self.base.flags.contains(IS_ABSOLUTELY_POSITIONED) {
|
||
self.build_display_list_for_absolutely_positioned_block(display_list,
|
||
layout_context,
|
||
border_painting_mode);
|
||
} else {
|
||
self.build_display_list_for_static_block(display_list,
|
||
layout_context,
|
||
border_painting_mode,
|
||
BackgroundAndBorderLevel::Block);
|
||
}
|
||
}
|
||
}
|
||
|
||
pub trait InlineFlowDisplayListBuilding {
|
||
fn build_display_list_for_inline(&mut self, layout_context: &LayoutContext);
|
||
}
|
||
|
||
impl InlineFlowDisplayListBuilding for InlineFlow {
|
||
fn build_display_list_for_inline(&mut self, layout_context: &LayoutContext) {
|
||
// TODO(#228): Once we form lines and have their cached bounds, we can be smarter and
|
||
// not recurse on a line if nothing in it can intersect the dirty region.
|
||
debug!("Flow: building display list for {} inline fragments", self.fragments.len());
|
||
|
||
let mut display_list = box DisplayList::new();
|
||
let mut has_stacking_context = false;
|
||
for fragment in self.fragments.fragments.iter_mut() {
|
||
fragment.build_display_list(&mut *display_list,
|
||
layout_context,
|
||
&self.base.stacking_relative_position,
|
||
&self.base
|
||
.absolute_position_info
|
||
.relative_containing_block_size,
|
||
self.base
|
||
.absolute_position_info
|
||
.relative_containing_block_mode,
|
||
BorderPaintingMode::Separate,
|
||
BackgroundAndBorderLevel::Content,
|
||
&self.base.clip,
|
||
&self.base.stacking_relative_position_of_display_port);
|
||
|
||
has_stacking_context = fragment.establishes_stacking_context();
|
||
|
||
match fragment.specific {
|
||
SpecificFragmentInfo::InlineBlock(ref mut block_flow) => {
|
||
let block_flow = &mut *block_flow.flow_ref;
|
||
flow::mut_base(block_flow).display_list_building_result
|
||
.add_to(&mut *display_list)
|
||
}
|
||
SpecificFragmentInfo::InlineAbsoluteHypothetical(ref mut block_flow) => {
|
||
let block_flow = &mut *block_flow.flow_ref;
|
||
flow::mut_base(block_flow).display_list_building_result
|
||
.add_to(&mut *display_list)
|
||
}
|
||
SpecificFragmentInfo::InlineAbsolute(ref mut block_flow) => {
|
||
let block_flow = &mut *block_flow.flow_ref;
|
||
flow::mut_base(block_flow).display_list_building_result
|
||
.add_to(&mut *display_list)
|
||
}
|
||
_ => {}
|
||
}
|
||
}
|
||
|
||
if !self.fragments.fragments.is_empty() {
|
||
self.base.build_display_items_for_debugging_tint(&mut *display_list,
|
||
self.fragments.fragments[0].node);
|
||
}
|
||
|
||
// FIXME(Savago): fix Fragment::establishes_stacking_context() for absolute positioned item
|
||
// and remove the check for filter presence. Further details on #5812.
|
||
has_stacking_context = has_stacking_context && {
|
||
if let SpecificFragmentInfo::Canvas(_) = self.fragments.fragments[0].specific {
|
||
true
|
||
} else {
|
||
!self.fragments.fragments[0].style().get_effects().filter.is_empty()
|
||
}
|
||
};
|
||
|
||
self.base.display_list_building_result = if has_stacking_context {
|
||
DisplayListBuildingResult::StackingContext(
|
||
self.fragments.fragments[0].create_stacking_context(&self.base,
|
||
display_list,
|
||
layout_context,
|
||
StackingContextLayer::IfCanvas(self.layer_id(0))))
|
||
} else {
|
||
DisplayListBuildingResult::Normal(display_list)
|
||
};
|
||
|
||
if opts::get().validate_display_list_geometry {
|
||
self.base.validate_display_list_geometry();
|
||
}
|
||
}
|
||
}
|
||
|
||
pub trait ListItemFlowDisplayListBuilding {
|
||
fn build_display_list_for_list_item(&mut self,
|
||
display_list: Box<DisplayList>,
|
||
layout_context: &LayoutContext);
|
||
}
|
||
|
||
impl ListItemFlowDisplayListBuilding for ListItemFlow {
|
||
fn build_display_list_for_list_item(&mut self,
|
||
mut display_list: Box<DisplayList>,
|
||
layout_context: &LayoutContext) {
|
||
// Draw the marker, if applicable.
|
||
if let Some(ref mut marker) = self.marker {
|
||
marker.build_display_list(&mut *display_list,
|
||
layout_context,
|
||
&self.block_flow.base.stacking_relative_position,
|
||
&self.block_flow
|
||
.base
|
||
.absolute_position_info
|
||
.relative_containing_block_size,
|
||
self.block_flow
|
||
.base
|
||
.absolute_position_info
|
||
.relative_containing_block_mode,
|
||
BorderPaintingMode::Separate,
|
||
BackgroundAndBorderLevel::Content,
|
||
&self.block_flow.base.clip,
|
||
&self.block_flow
|
||
.base
|
||
.stacking_relative_position_of_display_port);
|
||
}
|
||
|
||
// Draw the rest of the block.
|
||
self.block_flow.build_display_list_for_block(display_list,
|
||
layout_context,
|
||
BorderPaintingMode::Separate)
|
||
}
|
||
}
|
||
|
||
trait BaseFlowDisplayListBuilding {
|
||
fn build_display_items_for_debugging_tint(&self,
|
||
display_list: &mut DisplayList,
|
||
node: OpaqueNode);
|
||
}
|
||
|
||
impl BaseFlowDisplayListBuilding for BaseFlow {
|
||
fn build_display_items_for_debugging_tint(&self,
|
||
display_list: &mut DisplayList,
|
||
node: OpaqueNode) {
|
||
if !opts::get().show_debug_parallel_layout {
|
||
return
|
||
}
|
||
|
||
let thread_id = self.thread_id;
|
||
let stacking_context_relative_bounds =
|
||
Rect::new(self.stacking_relative_position,
|
||
self.position.size.to_physical(self.writing_mode));
|
||
|
||
let mut color = THREAD_TINT_COLORS[thread_id as usize % THREAD_TINT_COLORS.len()];
|
||
color.a = 1.0;
|
||
display_list.push(DisplayItem::BorderClass(box BorderDisplayItem {
|
||
base: BaseDisplayItem::new(stacking_context_relative_bounds.inflate(Au::from_px(2),
|
||
Au::from_px(2)),
|
||
DisplayItemMetadata {
|
||
node: node,
|
||
pointing: None,
|
||
},
|
||
self.clip.clone()),
|
||
border_widths: SideOffsets2D::new_all_same(Au::from_px(2)),
|
||
color: SideOffsets2D::new_all_same(color),
|
||
style: SideOffsets2D::new_all_same(border_style::T::solid),
|
||
radius: BorderRadii::all_same(Au(0)),
|
||
}), StackingLevel::Content);
|
||
}
|
||
}
|
||
|
||
// A helper data structure for gradients.
|
||
#[derive(Copy, Clone)]
|
||
struct StopRun {
|
||
start_offset: f32,
|
||
end_offset: f32,
|
||
start_index: usize,
|
||
stop_count: usize,
|
||
}
|
||
|
||
fn fmin(a: f32, b: f32) -> f32 {
|
||
if a < b {
|
||
a
|
||
} else {
|
||
b
|
||
}
|
||
}
|
||
|
||
fn position_to_offset(position: LengthOrPercentage, Au(total_length): Au) -> f32 {
|
||
match position {
|
||
LengthOrPercentage::Length(Au(length)) => {
|
||
fmin(1.0, (length as f32) / (total_length as f32))
|
||
}
|
||
LengthOrPercentage::Percentage(percentage) => percentage as f32,
|
||
}
|
||
}
|
||
|
||
/// "Steps" as defined by CSS 2.1 § E.2.
|
||
#[derive(Clone, PartialEq, Debug, Copy)]
|
||
pub enum StackingLevel {
|
||
/// The border and backgrounds for the root of this stacking context: steps 1 and 2.
|
||
BackgroundAndBorders,
|
||
/// Borders and backgrounds for block-level descendants: step 4.
|
||
BlockBackgroundsAndBorders,
|
||
/// All non-positioned content.
|
||
Content,
|
||
}
|
||
|
||
impl StackingLevel {
|
||
#[inline]
|
||
pub fn from_background_and_border_level(level: BackgroundAndBorderLevel) -> StackingLevel {
|
||
match level {
|
||
BackgroundAndBorderLevel::RootOfStackingContext => StackingLevel::BackgroundAndBorders,
|
||
BackgroundAndBorderLevel::Block => StackingLevel::BlockBackgroundsAndBorders,
|
||
BackgroundAndBorderLevel::Content => StackingLevel::Content,
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Which level to place backgrounds and borders in.
|
||
pub enum BackgroundAndBorderLevel {
|
||
RootOfStackingContext,
|
||
Block,
|
||
Content,
|
||
}
|
||
|
||
trait StackingContextConstruction {
|
||
/// Adds the given display item at the specified level to this display list.
|
||
fn push(&mut self, display_item: DisplayItem, level: StackingLevel);
|
||
}
|
||
|
||
impl StackingContextConstruction for DisplayList {
|
||
fn push(&mut self, display_item: DisplayItem, level: StackingLevel) {
|
||
match level {
|
||
StackingLevel::BackgroundAndBorders => {
|
||
self.background_and_borders.push_back(display_item)
|
||
}
|
||
StackingLevel::BlockBackgroundsAndBorders => {
|
||
self.block_backgrounds_and_borders.push_back(display_item)
|
||
}
|
||
StackingLevel::Content => self.content.push_back(display_item),
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Adjusts `content_rect` as necessary for the given spread, and blur so that the resulting
|
||
/// bounding rect contains all of a shadow's ink.
|
||
fn shadow_bounds(content_rect: &Rect<Au>, blur_radius: Au, spread_radius: Au) -> Rect<Au> {
|
||
let inflation = spread_radius + blur_radius * BLUR_INFLATION_FACTOR;
|
||
content_rect.inflate(inflation, inflation)
|
||
}
|
||
|
||
/// Allows a CSS color to be converted into a graphics color.
|
||
pub trait ToGfxColor {
|
||
/// Converts a CSS color to a graphics color.
|
||
fn to_gfx_color(&self) -> Color;
|
||
}
|
||
|
||
impl ToGfxColor for RGBA {
|
||
fn to_gfx_color(&self) -> Color {
|
||
color::rgba(self.red, self.green, self.blue, self.alpha)
|
||
}
|
||
}
|
||
|
||
/// Describes how to paint the borders.
|
||
#[derive(Copy, Clone)]
|
||
pub enum BorderPaintingMode<'a> {
|
||
/// Paint borders separately (`border-collapse: separate`).
|
||
Separate,
|
||
/// Paint collapsed borders.
|
||
Collapse(&'a CollapsedBordersForCell),
|
||
/// Paint no borders.
|
||
Hidden,
|
||
}
|
||
|