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layout: background-origin attribute for gradients
Fixes the glitches mentioned in #19554. Now gradient tiles are placed in the whole bounding box.
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7897bd15d7
commit
b0492f53af
8 changed files with 202 additions and 25 deletions
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@ -10,7 +10,7 @@ name = "layout"
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path = "lib.rs"
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[dependencies]
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app_units = "0.6"
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app_units = "0.6.1"
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atomic_refcell = "0.1"
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bitflags = "1.0"
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canvas_traits = {path = "../canvas_traits"}
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@ -58,6 +58,7 @@ use style::computed_values::position::T as StylePosition;
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use style::computed_values::visibility::T as Visibility;
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use style::logical_geometry::{LogicalMargin, LogicalPoint, LogicalRect, LogicalSize, WritingMode};
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use style::properties::ComputedValues;
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use style::properties::longhands::background_origin::single_value::computed_value::T as BackgroundOrigin;
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use style::properties::longhands::border_image_repeat::computed_value::RepeatKeyword;
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use style::properties::style_structs;
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use style::servo::restyle_damage::ServoRestyleDamage;
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@ -508,7 +509,7 @@ pub trait FragmentDisplayListBuilding {
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fn build_display_list_for_background_gradient(&self,
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state: &mut DisplayListBuildState,
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display_list_section: DisplayListSection,
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absolute_bounds: &Rect<Au>,
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absolute_bounds: Rect<Au>,
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clip: &LocalClip,
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gradient: &Gradient,
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style: &ComputedValues,
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@ -1123,7 +1124,7 @@ impl FragmentDisplayListBuilding for Fragment {
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Either::Second(Image::Gradient(ref gradient)) => {
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self.build_display_list_for_background_gradient(state,
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display_list_section,
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&absolute_bounds,
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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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@ -1414,22 +1415,56 @@ impl FragmentDisplayListBuilding for Fragment {
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fn build_display_list_for_background_gradient(&self,
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state: &mut DisplayListBuildState,
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display_list_section: DisplayListSection,
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absolute_bounds: &Rect<Au>,
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absolute_bounds: Rect<Au>,
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clip: &LocalClip,
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gradient: &Gradient,
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style: &ComputedValues,
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index: usize) {
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// Calculate where the first "tile" needs to be placed on one axis.
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// * base is the beginning of the visible area
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// * start is the current "tile" position
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// * tile is the length of the "tile"
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// Returns a difference between start and new start.
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// It holds that base - tile < start - diff <= base
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fn get_first_tile(base: Au, start: Au, tile: Au) -> Au {
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if tile == Au(0) {
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return Au(0);
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}
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if start > base {
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((start - base) / tile + 1) * tile
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} else {
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((base - start) / tile) * tile
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}
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}
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let bg = style.get_background();
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let bg_origin = get_cyclic(&bg.background_origin.0, index).clone();
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let bg_size = get_cyclic(&bg.background_size.0, index).clone();
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let bg_position_x = get_cyclic(&bg.background_position_x.0, index).clone();
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let bg_position_y = get_cyclic(&bg.background_position_y.0, index).clone();
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let border = self.border_width().to_physical(style.writing_mode);
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let mut bounds = *absolute_bounds;
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bounds.origin.x = bounds.origin.x + border.left + bg_position_x.to_used_value(bounds.size.width);
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bounds.origin.y = bounds.origin.y + border.top + bg_position_y.to_used_value(bounds.size.height);
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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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let mut bounds = absolute_bounds;
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match bg_origin {
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BackgroundOrigin::BorderBox => {}
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BackgroundOrigin::PaddingBox => {
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let border = style.logical_border_width().to_physical(style.writing_mode);
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bounds.origin.x += border.left;
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bounds.origin.y += border.top;
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bounds.size.width -= border.horizontal();
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bounds.size.height -= border.vertical();
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}
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BackgroundOrigin::ContentBox => {
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let border_padding = self.border_padding.to_physical(style.writing_mode);
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bounds.origin.x += border_padding.left;
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bounds.origin.y += border_padding.top;
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bounds.size.width -= border_padding.horizontal();
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bounds.size.height -= border_padding.vertical();
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}
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}
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bounds.origin.x += bg_position_x.to_used_value(bounds.size.width);
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bounds.origin.y += bg_position_y.to_used_value(bounds.size.height);
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let tile = match bg_size {
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BackgroundSize::Cover | BackgroundSize::Contain => bounds.size,
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@ -1442,7 +1477,18 @@ impl FragmentDisplayListBuilding for Fragment {
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}
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};
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let base = state.create_base_display_item(&bounds,
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let diff_x = get_first_tile(absolute_bounds.origin.x,
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bounds.origin.x,
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tile.width);
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let diff_y = get_first_tile(absolute_bounds.origin.y,
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bounds.origin.y,
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tile.height);
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let tiled_bounds = Rect::new(
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Point2D::new(bounds.origin.x - diff_x, bounds.origin.y - diff_y),
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Size2D::new(absolute_bounds.size.width + diff_x,
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absolute_bounds.size.height + diff_y));
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let base = state.create_base_display_item(&tiled_bounds,
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*clip,
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self.node,
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style.get_cursor(Cursor::Default),
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