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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//! Primitive segmentation
+//!
+//! # Overview
+//!
+//! Segmenting is the process of breaking rectangular primitives into smaller rectangular
+//! primitives in order to extract parts that could benefit from a fast paths.
+//!
+//! Typically this is used to allow fully opaque segments to be rendered in the opaque
+//! pass. For example when an opaque rectangle has a non-axis-aligned transform applied,
+//! we usually have to apply some anti-aliasing around the edges which requires alpha
+//! blending. By segmenting the edges out of the center of the primitive, we can keep a
+//! large amount of pixels in the opaque pass.
+//! Segmenting also lets us avoids rasterizing parts of clip masks that we know to have
+//! no effect or to be fully masking. For example by segmenting the corners of a rounded
+//! rectangle clip, we can optimize both rendering the mask and the primitive by only
+//! rasterize the corners in the mask and not applying any clipping to the segments of
+//! the primitive that don't overlap the borders.
+//!
+//! It is a flexible system in the sense that different sources of segmentation (for
+//! example two rounded rectangle clips) can affect the segmentation, and the possibility
+//! to segment some effects such as specific clip kinds does not necessarily mean the
+//! primitive will actually be segmented.
+//!
+//! ## Segments and clipping
+//!
+//! Segments of a primitive can be either not clipped, fully clipped, or partially clipped.
+//! In the first two case we don't need a clip mask. For each partially masked segments, a
+//! mask is rasterized using a render task. All of the interesting steps happen during frame
+//! building.
+//!
+//! - The first step is to determine the segmentation and write the associated GPU data.
+//! See `PrimitiveInstance::build_segments_if_needed` and `write_brush_segment_description`
+//! in `prim_store/mod.rs` which uses the segment builder of this module.
+//! - The second step is to generate the mask render tasks.
+//! See `BrushSegment::update_clip_task` and `RenderTask::new_mask`. For each segment that
+//! needs a mask, the contribution of all clips that affect the segment is added to the
+//! mask's render task.
+//! - Segments are assigned to batches (See `batch.rs`). Segments of a given primitive can
+//! be assigned to different batches.
+//!
+//! See also the [`clip` module documentation][clip.rs] for details about how clipping
+//! information is represented.
+//!
+//!
+//! [clip.rs]: ../clip/index.html
+//!
+
+use api::{BorderRadius, ClipMode};
+use api::units::*;
+use std::{cmp, usize};
+use crate::util::{extract_inner_rect_safe};
+use smallvec::SmallVec;
+
+bitflags! {
+ /// Each bit of the edge AA mask is:
+ /// 0, when the edge of the primitive needs to be considered for AA
+ /// 1, when the edge of the segment needs to be considered for AA
+ ///
+ /// *Note*: the bit values have to match the shader logic in
+ /// `write_transform_vertex()` function.
+ #[cfg_attr(feature = "capture", derive(Serialize))]
+ #[cfg_attr(feature = "replay", derive(Deserialize))]
+ #[derive(MallocSizeOf)]
+ pub struct EdgeAaSegmentMask: u8 {
+ ///
+ const LEFT = 0x1;
+ ///
+ const TOP = 0x2;
+ ///
+ const RIGHT = 0x4;
+ ///
+ const BOTTOM = 0x8;
+ }
+}
+
+bitflags! {
+ pub struct ItemFlags: u8 {
+ const X_ACTIVE = 0x1;
+ const Y_ACTIVE = 0x2;
+ const HAS_MASK = 0x4;
+ }
+}
+
+// The segment builder outputs a list of these segments.
+#[derive(Debug, PartialEq)]
+pub struct Segment {
+ pub rect: LayoutRect,
+ pub has_mask: bool,
+ pub edge_flags: EdgeAaSegmentMask,
+ pub region_x: usize,
+ pub region_y: usize,
+}
+
+// The segment builder creates a list of x/y axis events
+// that are used to build a segment list. Right now, we
+// don't bother providing a list of *which* clip regions
+// are active for a given segment. Instead, if there is
+// any clip mask present in a segment, we will just end
+// up drawing each of the masks to that segment clip.
+// This is a fairly rare case, but we can detect this
+// in the future and only apply clip masks that are
+// relevant to each segment region.
+// TODO(gw): Provide clip region info with each segment.
+#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd)]
+enum EventKind {
+ // Beginning of a clip (rounded) rect.
+ BeginClip,
+ // End of a clip (rounded) rect.
+ EndClip,
+ // Begin the next region in the primitive.
+ BeginRegion,
+}
+
+// Events must be ordered such that when the coordinates
+// of two events are the same, the end events are processed
+// before the begin events. This ensures that we're able
+// to detect which regions are active for a given segment.
+impl Ord for EventKind {
+ fn cmp(&self, other: &EventKind) -> cmp::Ordering {
+ match (*self, *other) {
+ (EventKind::BeginRegion, EventKind::BeginRegion) => {
+ panic!("bug: regions must be non-overlapping")
+ }
+ (EventKind::EndClip, EventKind::BeginRegion) |
+ (EventKind::BeginRegion, EventKind::BeginClip) => {
+ cmp::Ordering::Less
+ }
+ (EventKind::BeginClip, EventKind::BeginRegion) |
+ (EventKind::BeginRegion, EventKind::EndClip) => {
+ cmp::Ordering::Greater
+ }
+ (EventKind::BeginClip, EventKind::BeginClip) |
+ (EventKind::EndClip, EventKind::EndClip) => {
+ cmp::Ordering::Equal
+ }
+ (EventKind::BeginClip, EventKind::EndClip) => {
+ cmp::Ordering::Greater
+ }
+ (EventKind::EndClip, EventKind::BeginClip) => {
+ cmp::Ordering::Less
+ }
+ }
+ }
+}
+
+// A x/y event where we will create a vertex in the
+// segment builder.
+#[derive(Debug, Eq, PartialEq, PartialOrd)]
+struct Event {
+ value: Au,
+ item_index: ItemIndex,
+ kind: EventKind,
+}
+
+impl Ord for Event {
+ fn cmp(&self, other: &Event) -> cmp::Ordering {
+ self.value
+ .cmp(&other.value)
+ .then(self.kind.cmp(&other.kind))
+ }
+}
+
+impl Event {
+ fn begin(value: f32, index: usize) -> Event {
+ Event {
+ value: Au::from_f32_px(value),
+ item_index: ItemIndex(index),
+ kind: EventKind::BeginClip,
+ }
+ }
+
+ fn end(value: f32, index: usize) -> Event {
+ Event {
+ value: Au::from_f32_px(value),
+ item_index: ItemIndex(index),
+ kind: EventKind::EndClip,
+ }
+ }
+
+ fn region(value: f32) -> Event {
+ Event {
+ value: Au::from_f32_px(value),
+ kind: EventKind::BeginRegion,
+ item_index: ItemIndex(usize::MAX),
+ }
+ }
+
+ fn update(
+ &self,
+ flag: ItemFlags,
+ items: &mut [Item],
+ region: &mut usize,
+ ) {
+ let is_active = match self.kind {
+ EventKind::BeginClip => true,
+ EventKind::EndClip => false,
+ EventKind::BeginRegion => {
+ *region += 1;
+ return;
+ }
+ };
+
+ items[self.item_index.0].flags.set(flag, is_active);
+ }
+}
+
+// An item that provides some kind of clip region (either
+// a clip in/out rect, or a mask region).
+#[derive(Debug)]
+struct Item {
+ rect: LayoutRect,
+ mode: Option<ClipMode>,
+ flags: ItemFlags,
+}
+
+impl Item {
+ fn new(
+ rect: LayoutRect,
+ mode: Option<ClipMode>,
+ has_mask: bool,
+ ) -> Item {
+ let flags = if has_mask {
+ ItemFlags::HAS_MASK
+ } else {
+ ItemFlags::empty()
+ };
+
+ Item {
+ rect,
+ mode,
+ flags,
+ }
+ }
+}
+
+#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd)]
+struct ItemIndex(usize);
+
+// The main public interface to the segment module.
+pub struct SegmentBuilder {
+ items: Vec<Item>,
+ inner_rect: Option<LayoutRect>,
+ bounding_rect: Option<LayoutRect>,
+ has_interesting_clips: bool,
+
+ #[cfg(debug_assertions)]
+ initialized: bool,
+}
+
+impl SegmentBuilder {
+ // Create a new segment builder, supplying the primitive
+ // local rect and associated local clip rect.
+ pub fn new() -> SegmentBuilder {
+ SegmentBuilder {
+ items: Vec::with_capacity(4),
+ bounding_rect: None,
+ inner_rect: None,
+ has_interesting_clips: false,
+ #[cfg(debug_assertions)]
+ initialized: false,
+ }
+ }
+
+ pub fn initialize(
+ &mut self,
+ local_rect: LayoutRect,
+ inner_rect: Option<LayoutRect>,
+ local_clip_rect: LayoutRect,
+ ) {
+ self.items.clear();
+ self.inner_rect = inner_rect;
+ self.bounding_rect = Some(local_rect);
+
+ self.push_clip_rect(local_rect, None, ClipMode::Clip);
+ self.push_clip_rect(local_clip_rect, None, ClipMode::Clip);
+
+ // This must be set after the push_clip_rect calls above, since we
+ // want to skip segment building if those are the only clips.
+ self.has_interesting_clips = false;
+
+ #[cfg(debug_assertions)]
+ {
+ self.initialized = true;
+ }
+ }
+
+ // Push a region defined by an inner and outer rect where there
+ // is a mask required. This ensures that segments which intersect
+ // with these areas will get a clip mask task allocated. This
+ // is currently used to mark where a box-shadow region can affect
+ // the pixels of a clip-mask. It might be useful for other types
+ // such as dashed and dotted borders in the future.
+ pub fn push_mask_region(
+ &mut self,
+ outer_rect: LayoutRect,
+ inner_rect: LayoutRect,
+ inner_clip_mode: Option<ClipMode>,
+ ) {
+ self.has_interesting_clips = true;
+
+ if inner_rect.is_empty() {
+ self.items.push(Item::new(
+ outer_rect,
+ None,
+ true
+ ));
+ return;
+ }
+
+ debug_assert!(outer_rect.contains_rect(&inner_rect));
+
+ let p0 = outer_rect.origin;
+ let p1 = inner_rect.origin;
+ let p2 = inner_rect.bottom_right();
+ let p3 = outer_rect.bottom_right();
+
+ let segments = &[
+ LayoutRect::new(
+ LayoutPoint::new(p0.x, p0.y),
+ LayoutSize::new(p1.x - p0.x, p1.y - p0.y),
+ ),
+ LayoutRect::new(
+ LayoutPoint::new(p2.x, p0.y),
+ LayoutSize::new(p3.x - p2.x, p1.y - p0.y),
+ ),
+ LayoutRect::new(
+ LayoutPoint::new(p2.x, p2.y),
+ LayoutSize::new(p3.x - p2.x, p3.y - p2.y),
+ ),
+ LayoutRect::new(
+ LayoutPoint::new(p0.x, p2.y),
+ LayoutSize::new(p1.x - p0.x, p3.y - p2.y),
+ ),
+ LayoutRect::new(
+ LayoutPoint::new(p1.x, p0.y),
+ LayoutSize::new(p2.x - p1.x, p1.y - p0.y),
+ ),
+ LayoutRect::new(
+ LayoutPoint::new(p2.x, p1.y),
+ LayoutSize::new(p3.x - p2.x, p2.y - p1.y),
+ ),
+ LayoutRect::new(
+ LayoutPoint::new(p1.x, p2.y),
+ LayoutSize::new(p2.x - p1.x, p3.y - p2.y),
+ ),
+ LayoutRect::new(
+ LayoutPoint::new(p0.x, p1.y),
+ LayoutSize::new(p1.x - p0.x, p2.y - p1.y),
+ ),
+ ];
+
+ self.items.reserve(segments.len() + 1);
+
+ for segment in segments {
+ self.items.push(Item::new(
+ *segment,
+ None,
+ true
+ ));
+ }
+
+ if inner_clip_mode.is_some() {
+ self.items.push(Item::new(
+ inner_rect,
+ inner_clip_mode,
+ false,
+ ));
+ }
+ }
+
+ // Push some kind of clipping region into the segment builder.
+ // If radius is None, it's a simple rect.
+ pub fn push_clip_rect(
+ &mut self,
+ rect: LayoutRect,
+ radius: Option<BorderRadius>,
+ mode: ClipMode,
+ ) {
+ self.has_interesting_clips = true;
+
+ // Keep track of a minimal bounding rect for the set of
+ // segments that will be generated.
+ if mode == ClipMode::Clip {
+ self.bounding_rect = self.bounding_rect.and_then(|bounding_rect| {
+ bounding_rect.intersection(&rect)
+ });
+ }
+ let mode = Some(mode);
+
+ match radius {
+ Some(radius) => {
+ // For a rounded rect, try to create a nine-patch where there
+ // is a clip item for each corner, inner and edge region.
+ match extract_inner_rect_safe(&rect, &radius) {
+ Some(inner) => {
+ let p0 = rect.origin;
+ let p1 = inner.origin;
+ let p2 = inner.bottom_right();
+ let p3 = rect.bottom_right();
+
+ self.items.reserve(9);
+
+ let corner_segments = &[
+ LayoutRect::new(
+ LayoutPoint::new(p0.x, p0.y),
+ LayoutSize::new(p1.x - p0.x, p1.y - p0.y),
+ ),
+ LayoutRect::new(
+ LayoutPoint::new(p2.x, p0.y),
+ LayoutSize::new(p3.x - p2.x, p1.y - p0.y),
+ ),
+ LayoutRect::new(
+ LayoutPoint::new(p2.x, p2.y),
+ LayoutSize::new(p3.x - p2.x, p3.y - p2.y),
+ ),
+ LayoutRect::new(
+ LayoutPoint::new(p0.x, p2.y),
+ LayoutSize::new(p1.x - p0.x, p3.y - p2.y),
+ ),
+ ];
+
+ for segment in corner_segments {
+ self.items.push(Item::new(
+ *segment,
+ mode,
+ true
+ ));
+ }
+
+ let other_segments = &[
+ LayoutRect::new(
+ LayoutPoint::new(p1.x, p0.y),
+ LayoutSize::new(p2.x - p1.x, p1.y - p0.y),
+ ),
+ LayoutRect::new(
+ LayoutPoint::new(p2.x, p1.y),
+ LayoutSize::new(p3.x - p2.x, p2.y - p1.y),
+ ),
+ LayoutRect::new(
+ LayoutPoint::new(p1.x, p2.y),
+ LayoutSize::new(p2.x - p1.x, p3.y - p2.y),
+ ),
+ LayoutRect::new(
+ LayoutPoint::new(p0.x, p1.y),
+ LayoutSize::new(p1.x - p0.x, p2.y - p1.y),
+ ),
+ LayoutRect::new(
+ LayoutPoint::new(p1.x, p1.y),
+ LayoutSize::new(p2.x - p1.x, p2.y - p1.y),
+ ),
+ ];
+
+ for segment in other_segments {
+ self.items.push(Item::new(
+ *segment,
+ mode,
+ false,
+ ));
+ }
+ }
+ None => {
+ // If we get here, we could not extract an inner rectangle
+ // for this clip region. This can occur in cases such as
+ // a rounded rect where the top-left and bottom-left radii
+ // result in overlapping rects. In that case, just create
+ // a single clip region for the entire rounded rect.
+ self.items.push(Item::new(
+ rect,
+ mode,
+ true,
+ ))
+ }
+ }
+ }
+ None => {
+ // For a simple rect, just create one clipping item.
+ self.items.push(Item::new(
+ rect,
+ mode,
+ false,
+ ))
+ }
+ }
+ }
+
+ // Consume this segment builder and produce a list of segments.
+ pub fn build<F>(&mut self, mut f: F) where F: FnMut(&Segment) {
+ #[cfg(debug_assertions)]
+ debug_assert!(self.initialized);
+
+ #[cfg(debug_assertions)]
+ {
+ self.initialized = false;
+ }
+
+ let bounding_rect = match self.bounding_rect {
+ Some(bounding_rect) => bounding_rect,
+ None => return,
+ };
+
+ if !self.has_interesting_clips {
+ // There were no additional clips added, so don't bother building segments.
+ // Just emit a single segment for the bounding rect of the primitive.
+ f(&Segment {
+ edge_flags: EdgeAaSegmentMask::all(),
+ region_x: 0,
+ region_y: 0,
+ has_mask: false,
+ rect: bounding_rect,
+ });
+ return
+ }
+
+ // First, filter out any items that don't intersect
+ // with the visible bounding rect.
+ self.items.retain(|item| item.rect.intersects(&bounding_rect));
+
+ // Create events for each item
+ let mut x_events : SmallVec<[Event; 4]> = SmallVec::new();
+ let mut y_events : SmallVec<[Event; 4]> = SmallVec::new();
+
+ for (item_index, item) in self.items.iter().enumerate() {
+ let p0 = item.rect.origin;
+ let p1 = item.rect.bottom_right();
+
+ x_events.push(Event::begin(p0.x, item_index));
+ x_events.push(Event::end(p1.x, item_index));
+ y_events.push(Event::begin(p0.y, item_index));
+ y_events.push(Event::end(p1.y, item_index));
+ }
+
+ // Add the region events, if provided.
+ if let Some(inner_rect) = self.inner_rect {
+ x_events.push(Event::region(inner_rect.origin.x));
+ x_events.push(Event::region(inner_rect.origin.x + inner_rect.size.width));
+
+ y_events.push(Event::region(inner_rect.origin.y));
+ y_events.push(Event::region(inner_rect.origin.y + inner_rect.size.height));
+ }
+
+ // Get the minimal bounding rect in app units. We will
+ // work in fixed point in order to avoid float precision
+ // error while handling events.
+ let p0 = LayoutPointAu::new(
+ Au::from_f32_px(bounding_rect.origin.x),
+ Au::from_f32_px(bounding_rect.origin.y),
+ );
+
+ let p1 = LayoutPointAu::new(
+ Au::from_f32_px(bounding_rect.origin.x + bounding_rect.size.width),
+ Au::from_f32_px(bounding_rect.origin.y + bounding_rect.size.height),
+ );
+
+ // Sort the events in ascending order.
+ x_events.sort();
+ y_events.sort();
+
+ // Generate segments from the event lists, by sweeping the y-axis
+ // and then the x-axis for each event. This can generate a significant
+ // number of segments, but most importantly, it ensures that there are
+ // no t-junctions in the generated segments. It's probably possible
+ // to come up with more efficient segmentation algorithms, at least
+ // for simple / common cases.
+
+ // Each coordinate is clamped to the bounds of the minimal
+ // bounding rect. This ensures that we don't generate segments
+ // outside that bounding rect, but does allow correctly handling
+ // clips where the clip region starts outside the minimal
+ // rect but still intersects with it.
+
+ let mut prev_y = clamp(p0.y, y_events[0].value, p1.y);
+ let mut region_y = 0;
+ let mut segments : SmallVec<[_; 4]> = SmallVec::new();
+ let mut x_count = 0;
+ let mut y_count = 0;
+
+ for ey in &y_events {
+ let cur_y = clamp(p0.y, ey.value, p1.y);
+
+ if cur_y != prev_y {
+ let mut prev_x = clamp(p0.x, x_events[0].value, p1.x);
+ let mut region_x = 0;
+
+ for ex in &x_events {
+ let cur_x = clamp(p0.x, ex.value, p1.x);
+
+ if cur_x != prev_x {
+ segments.push(emit_segment_if_needed(
+ prev_x,
+ prev_y,
+ cur_x,
+ cur_y,
+ region_x,
+ region_y,
+ &self.items,
+ ));
+
+ prev_x = cur_x;
+ if y_count == 0 {
+ x_count += 1;
+ }
+ }
+
+ ex.update(
+ ItemFlags::X_ACTIVE,
+ &mut self.items,
+ &mut region_x,
+ );
+ }
+
+ prev_y = cur_y;
+ y_count += 1;
+ }
+
+ ey.update(
+ ItemFlags::Y_ACTIVE,
+ &mut self.items,
+ &mut region_y,
+ );
+ }
+
+ // Run user supplied closure for each valid segment.
+ debug_assert_eq!(segments.len(), x_count * y_count);
+ for y in 0 .. y_count {
+ for x in 0 .. x_count {
+ let mut edge_flags = EdgeAaSegmentMask::empty();
+
+ if x == 0 || segments[y * x_count + x - 1].is_none() {
+ edge_flags |= EdgeAaSegmentMask::LEFT;
+ }
+ if x == x_count-1 || segments[y * x_count + x + 1].is_none() {
+ edge_flags |= EdgeAaSegmentMask::RIGHT;
+ }
+ if y == 0 || segments[(y-1) * x_count + x].is_none() {
+ edge_flags |= EdgeAaSegmentMask::TOP;
+ }
+ if y == y_count-1 || segments[(y+1) * x_count + x].is_none() {
+ edge_flags |= EdgeAaSegmentMask::BOTTOM;
+ }
+
+ if let Some(ref mut segment) = segments[y * x_count + x] {
+ segment.edge_flags = edge_flags;
+ f(segment);
+ }
+ }
+ }
+ }
+}
+
+fn clamp(low: Au, value: Au, high: Au) -> Au {
+ value.max(low).min(high)
+}
+
+fn emit_segment_if_needed(
+ x0: Au,
+ y0: Au,
+ x1: Au,
+ y1: Au,
+ region_x: usize,
+ region_y: usize,
+ items: &[Item],
+) -> Option<Segment> {
+ debug_assert!(x1 > x0);
+ debug_assert!(y1 > y0);
+
+ // TODO(gw): Don't scan the whole list of items for
+ // each segment rect. Store active list
+ // in a hash set or similar if this ever
+ // shows up in a profile.
+ let mut has_clip_mask = false;
+
+ for item in items {
+ if item.flags.contains(ItemFlags::X_ACTIVE | ItemFlags::Y_ACTIVE) {
+ has_clip_mask |= item.flags.contains(ItemFlags::HAS_MASK);
+
+ if item.mode == Some(ClipMode::ClipOut) && !item.flags.contains(ItemFlags::HAS_MASK) {
+ return None;
+ }
+ }
+ }
+
+ let segment_rect = LayoutRect::new(
+ LayoutPoint::new(
+ x0.to_f32_px(),
+ y0.to_f32_px(),
+ ),
+ LayoutSize::new(
+ (x1 - x0).to_f32_px(),
+ (y1 - y0).to_f32_px(),
+ ),
+ );
+
+ Some(Segment {
+ rect: segment_rect,
+ has_mask: has_clip_mask,
+ edge_flags: EdgeAaSegmentMask::empty(),
+ region_x,
+ region_y,
+ })
+}
+
+#[cfg(test)]
+mod test {
+ use api::{BorderRadius, ClipMode};
+ use api::units::{LayoutPoint, LayoutRect, LayoutSize};
+ use super::{Segment, SegmentBuilder, EdgeAaSegmentMask};
+ use std::cmp;
+
+ fn rect(x0: f32, y0: f32, x1: f32, y1: f32) -> LayoutRect {
+ LayoutRect::new(
+ LayoutPoint::new(x0, y0),
+ LayoutSize::new(x1-x0, y1-y0),
+ )
+ }
+
+ fn seg(
+ x0: f32,
+ y0: f32,
+ x1: f32,
+ y1: f32,
+ has_mask: bool,
+ edge_flags: Option<EdgeAaSegmentMask>,
+ ) -> Segment {
+ seg_region(x0, y0, x1, y1, 0, 0, has_mask, edge_flags)
+ }
+
+ fn seg_region(
+ x0: f32,
+ y0: f32,
+ x1: f32,
+ y1: f32,
+ region_x: usize,
+ region_y: usize,
+ has_mask: bool,
+ edge_flags: Option<EdgeAaSegmentMask>,
+ ) -> Segment {
+ Segment {
+ rect: LayoutRect::new(
+ LayoutPoint::new(x0, y0),
+ LayoutSize::new(x1-x0, y1-y0),
+ ),
+ has_mask,
+ edge_flags: edge_flags.unwrap_or(EdgeAaSegmentMask::empty()),
+ region_x,
+ region_y,
+ }
+ }
+
+ fn segment_sorter(s0: &Segment, s1: &Segment) -> cmp::Ordering {
+ let r0 = &s0.rect;
+ let r1 = &s1.rect;
+
+ (
+ (r0.origin.x, r0.origin.y, r0.size.width, r0.size.height)
+ ).partial_cmp(&
+ (r1.origin.x, r1.origin.y, r1.size.width, r1.size.height)
+ ).unwrap()
+ }
+
+ fn seg_test(
+ local_rect: LayoutRect,
+ inner_rect: Option<LayoutRect>,
+ local_clip_rect: LayoutRect,
+ clips: &[(LayoutRect, Option<BorderRadius>, ClipMode)],
+ expected_segments: &mut [Segment]
+ ) {
+ let mut sb = SegmentBuilder::new();
+ sb.initialize(
+ local_rect,
+ inner_rect,
+ local_clip_rect,
+ );
+ sb.push_clip_rect(local_rect, None, ClipMode::Clip);
+ sb.push_clip_rect(local_clip_rect, None, ClipMode::Clip);
+ let mut segments = Vec::new();
+ for &(rect, radius, mode) in clips {
+ sb.push_clip_rect(rect, radius, mode);
+ }
+ sb.build(|segment| {
+ segments.push(Segment {
+ ..*segment
+ });
+ });
+ segments.sort_by(segment_sorter);
+ expected_segments.sort_by(segment_sorter);
+ assert_eq!(
+ segments.len(),
+ expected_segments.len(),
+ "segments\n{:?}\nexpected\n{:?}\n",
+ segments,
+ expected_segments
+ );
+ for (segment, expected) in segments.iter().zip(expected_segments.iter()) {
+ assert_eq!(segment, expected);
+ }
+ }
+
+ #[test]
+ fn segment_empty() {
+ seg_test(
+ rect(0.0, 0.0, 0.0, 0.0),
+ None,
+ rect(0.0, 0.0, 0.0, 0.0),
+ &[],
+ &mut [],
+ );
+ }
+
+ #[test]
+ fn segment_single() {
+ seg_test(
+ rect(10.0, 20.0, 30.0, 40.0),
+ None,
+ rect(10.0, 20.0, 30.0, 40.0),
+ &[],
+ &mut [
+ seg(10.0, 20.0, 30.0, 40.0, false,
+ Some(EdgeAaSegmentMask::LEFT |
+ EdgeAaSegmentMask::TOP |
+ EdgeAaSegmentMask::RIGHT |
+ EdgeAaSegmentMask::BOTTOM
+ )
+ ),
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_single_clip() {
+ seg_test(
+ rect(10.0, 20.0, 30.0, 40.0),
+ None,
+ rect(10.0, 20.0, 25.0, 35.0),
+ &[],
+ &mut [
+ seg(10.0, 20.0, 25.0, 35.0, false,
+ Some(EdgeAaSegmentMask::LEFT |
+ EdgeAaSegmentMask::TOP |
+ EdgeAaSegmentMask::RIGHT |
+ EdgeAaSegmentMask::BOTTOM
+ )
+ ),
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_inner_clip() {
+ seg_test(
+ rect(10.0, 20.0, 30.0, 40.0),
+ None,
+ rect(15.0, 25.0, 25.0, 35.0),
+ &[],
+ &mut [
+ seg(15.0, 25.0, 25.0, 35.0, false,
+ Some(EdgeAaSegmentMask::LEFT |
+ EdgeAaSegmentMask::TOP |
+ EdgeAaSegmentMask::RIGHT |
+ EdgeAaSegmentMask::BOTTOM
+ )
+ ),
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_outer_clip() {
+ seg_test(
+ rect(15.0, 25.0, 25.0, 35.0),
+ None,
+ rect(10.0, 20.0, 30.0, 40.0),
+ &[],
+ &mut [
+ seg(15.0, 25.0, 25.0, 35.0, false,
+ Some(EdgeAaSegmentMask::LEFT |
+ EdgeAaSegmentMask::TOP |
+ EdgeAaSegmentMask::RIGHT |
+ EdgeAaSegmentMask::BOTTOM
+ )
+ ),
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_clip_int() {
+ seg_test(
+ rect(10.0, 20.0, 30.0, 40.0),
+ None,
+ rect(20.0, 10.0, 40.0, 30.0),
+ &[],
+ &mut [
+ seg(20.0, 20.0, 30.0, 30.0, false,
+ Some(EdgeAaSegmentMask::LEFT |
+ EdgeAaSegmentMask::TOP |
+ EdgeAaSegmentMask::RIGHT |
+ EdgeAaSegmentMask::BOTTOM
+ )
+ ),
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_clip_disjoint() {
+ seg_test(
+ rect(10.0, 20.0, 30.0, 40.0),
+ None,
+ rect(30.0, 20.0, 50.0, 40.0),
+ &[],
+ &mut [],
+ );
+ }
+
+ #[test]
+ fn segment_clips() {
+ seg_test(
+ rect(0.0, 0.0, 100.0, 100.0),
+ None,
+ rect(-1000.0, -1000.0, 1000.0, 1000.0),
+ &[
+ (rect(20.0, 20.0, 40.0, 40.0), None, ClipMode::Clip),
+ (rect(40.0, 20.0, 60.0, 40.0), None, ClipMode::Clip),
+ ],
+ &mut [
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_rounded_clip() {
+ seg_test(
+ rect(0.0, 0.0, 100.0, 100.0),
+ None,
+ rect(-1000.0, -1000.0, 1000.0, 1000.0),
+ &[
+ (rect(20.0, 20.0, 60.0, 60.0), Some(BorderRadius::uniform(10.0)), ClipMode::Clip),
+ ],
+ &mut [
+ // corners
+ seg(20.0, 20.0, 30.0, 30.0, true, Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::TOP)),
+ seg(20.0, 50.0, 30.0, 60.0, true, Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::BOTTOM)),
+ seg(50.0, 20.0, 60.0, 30.0, true, Some(EdgeAaSegmentMask::RIGHT | EdgeAaSegmentMask::TOP)),
+ seg(50.0, 50.0, 60.0, 60.0, true, Some(EdgeAaSegmentMask::RIGHT | EdgeAaSegmentMask::BOTTOM)),
+
+ // inner
+ seg(30.0, 30.0, 50.0, 50.0, false, None),
+
+ // edges
+ seg(30.0, 20.0, 50.0, 30.0, false, Some(EdgeAaSegmentMask::TOP)),
+ seg(30.0, 50.0, 50.0, 60.0, false, Some(EdgeAaSegmentMask::BOTTOM)),
+ seg(20.0, 30.0, 30.0, 50.0, false, Some(EdgeAaSegmentMask::LEFT)),
+ seg(50.0, 30.0, 60.0, 50.0, false, Some(EdgeAaSegmentMask::RIGHT)),
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_clip_out() {
+ seg_test(
+ rect(0.0, 0.0, 100.0, 100.0),
+ None,
+ rect(-1000.0, -1000.0, 2000.0, 2000.0),
+ &[
+ (rect(20.0, 20.0, 60.0, 60.0), None, ClipMode::ClipOut),
+ ],
+ &mut [
+ seg(0.0, 0.0, 20.0, 20.0, false, Some(EdgeAaSegmentMask::TOP | EdgeAaSegmentMask::LEFT)),
+ seg(20.0, 0.0, 60.0, 20.0, false, Some(EdgeAaSegmentMask::TOP | EdgeAaSegmentMask::BOTTOM)),
+ seg(60.0, 0.0, 100.0, 20.0, false, Some(EdgeAaSegmentMask::TOP | EdgeAaSegmentMask::RIGHT)),
+
+ seg(0.0, 20.0, 20.0, 60.0, false, Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::RIGHT)),
+ seg(60.0, 20.0, 100.0, 60.0, false, Some(EdgeAaSegmentMask::RIGHT | EdgeAaSegmentMask::LEFT)),
+
+ seg(0.0, 60.0, 20.0, 100.0, false, Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::BOTTOM)),
+ seg(20.0, 60.0, 60.0, 100.0, false, Some(EdgeAaSegmentMask::BOTTOM | EdgeAaSegmentMask::TOP)),
+ seg(60.0, 60.0, 100.0, 100.0, false, Some(EdgeAaSegmentMask::BOTTOM | EdgeAaSegmentMask::RIGHT)),
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_rounded_clip_out() {
+ seg_test(
+ rect(0.0, 0.0, 100.0, 100.0),
+ None,
+ rect(-1000.0, -1000.0, 2000.0, 2000.0),
+ &[
+ (rect(20.0, 20.0, 60.0, 60.0), Some(BorderRadius::uniform(10.0)), ClipMode::ClipOut),
+ ],
+ &mut [
+ // top row
+ seg(0.0, 0.0, 20.0, 20.0, false, Some(EdgeAaSegmentMask::TOP | EdgeAaSegmentMask::LEFT)),
+ seg(20.0, 0.0, 30.0, 20.0, false, Some(EdgeAaSegmentMask::TOP)),
+ seg(30.0, 0.0, 50.0, 20.0, false, Some(EdgeAaSegmentMask::TOP | EdgeAaSegmentMask::BOTTOM)),
+ seg(50.0, 0.0, 60.0, 20.0, false, Some(EdgeAaSegmentMask::TOP)),
+ seg(60.0, 0.0, 100.0, 20.0, false, Some(EdgeAaSegmentMask::TOP | EdgeAaSegmentMask::RIGHT)),
+
+ // left
+ seg(0.0, 20.0, 20.0, 30.0, false, Some(EdgeAaSegmentMask::LEFT)),
+ seg(0.0, 30.0, 20.0, 50.0, false, Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::RIGHT)),
+ seg(0.0, 50.0, 20.0, 60.0, false, Some(EdgeAaSegmentMask::LEFT)),
+
+ // right
+ seg(60.0, 20.0, 100.0, 30.0, false, Some(EdgeAaSegmentMask::RIGHT)),
+ seg(60.0, 30.0, 100.0, 50.0, false, Some(EdgeAaSegmentMask::RIGHT | EdgeAaSegmentMask::LEFT)),
+ seg(60.0, 50.0, 100.0, 60.0, false, Some(EdgeAaSegmentMask::RIGHT)),
+
+ // bottom row
+ seg(0.0, 60.0, 20.0, 100.0, false, Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::BOTTOM)),
+ seg(20.0, 60.0, 30.0, 100.0, false, Some(EdgeAaSegmentMask::BOTTOM)),
+ seg(30.0, 60.0, 50.0, 100.0, false, Some(EdgeAaSegmentMask::BOTTOM | EdgeAaSegmentMask::TOP)),
+ seg(50.0, 60.0, 60.0, 100.0, false, Some(EdgeAaSegmentMask::BOTTOM)),
+ seg(60.0, 60.0, 100.0, 100.0, false, Some(EdgeAaSegmentMask::RIGHT | EdgeAaSegmentMask::BOTTOM)),
+
+ // inner corners
+ seg(20.0, 20.0, 30.0, 30.0, true, Some(EdgeAaSegmentMask::RIGHT | EdgeAaSegmentMask::BOTTOM)),
+ seg(20.0, 50.0, 30.0, 60.0, true, Some(EdgeAaSegmentMask::TOP | EdgeAaSegmentMask::RIGHT)),
+ seg(50.0, 20.0, 60.0, 30.0, true, Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::BOTTOM)),
+ seg(50.0, 50.0, 60.0, 60.0, true, Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::TOP)),
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_clip_in_clip_out() {
+ seg_test(
+ rect(0.0, 0.0, 100.0, 100.0),
+ None,
+ rect(-1000.0, -1000.0, 2000.0, 2000.0),
+ &[
+ (rect(20.0, 20.0, 60.0, 60.0), None, ClipMode::Clip),
+ (rect(50.0, 50.0, 80.0, 80.0), None, ClipMode::ClipOut),
+ ],
+ &mut [
+ seg(20.0, 20.0, 50.0, 50.0, false, Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::TOP)),
+ seg(50.0, 20.0, 60.0, 50.0, false, Some(EdgeAaSegmentMask::TOP | EdgeAaSegmentMask::RIGHT | EdgeAaSegmentMask::BOTTOM)),
+ seg(20.0, 50.0, 50.0, 60.0, false, Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::BOTTOM | EdgeAaSegmentMask::RIGHT)),
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_rounded_clip_overlap() {
+ seg_test(
+ rect(0.0, 0.0, 100.0, 100.0),
+ None,
+ rect(0.0, 0.0, 100.0, 100.0),
+ &[
+ (rect(0.0, 0.0, 10.0, 10.0), None, ClipMode::ClipOut),
+ (rect(0.0, 0.0, 100.0, 100.0), Some(BorderRadius::uniform(10.0)), ClipMode::Clip),
+ ],
+ &mut [
+ // corners
+ seg(0.0, 90.0, 10.0, 100.0, true, Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::BOTTOM)),
+ seg(90.0, 0.0, 100.0, 10.0, true, Some(EdgeAaSegmentMask::RIGHT | EdgeAaSegmentMask::TOP)),
+ seg(90.0, 90.0, 100.0, 100.0, true, Some(EdgeAaSegmentMask::RIGHT | EdgeAaSegmentMask::BOTTOM)),
+
+ // inner
+ seg(10.0, 10.0, 90.0, 90.0, false, None),
+
+ // edges
+ seg(10.0, 0.0, 90.0, 10.0, false, Some(EdgeAaSegmentMask::TOP | EdgeAaSegmentMask::LEFT)),
+ seg(10.0, 90.0, 90.0, 100.0, false, Some(EdgeAaSegmentMask::BOTTOM)),
+ seg(0.0, 10.0, 10.0, 90.0, false, Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::TOP)),
+ seg(90.0, 10.0, 100.0, 90.0, false, Some(EdgeAaSegmentMask::RIGHT)),
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_rounded_clip_overlap_reverse() {
+ seg_test(
+ rect(0.0, 0.0, 100.0, 100.0),
+ None,
+ rect(0.0, 0.0, 100.0, 100.0),
+ &[
+ (rect(10.0, 10.0, 90.0, 90.0), None, ClipMode::Clip),
+ (rect(0.0, 0.0, 100.0, 100.0), Some(BorderRadius::uniform(10.0)), ClipMode::Clip),
+ ],
+ &mut [
+ seg(10.0, 10.0, 90.0, 90.0, false,
+ Some(EdgeAaSegmentMask::LEFT |
+ EdgeAaSegmentMask::TOP |
+ EdgeAaSegmentMask::RIGHT |
+ EdgeAaSegmentMask::BOTTOM
+ )
+ ),
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_clip_in_clip_out_overlap() {
+ seg_test(
+ rect(0.0, 0.0, 100.0, 100.0),
+ None,
+ rect(0.0, 0.0, 100.0, 100.0),
+ &[
+ (rect(10.0, 10.0, 90.0, 90.0), None, ClipMode::Clip),
+ (rect(10.0, 10.0, 90.0, 90.0), None, ClipMode::ClipOut),
+ ],
+ &mut [
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_event_order() {
+ seg_test(
+ rect(0.0, 0.0, 100.0, 100.0),
+ None,
+ rect(0.0, 0.0, 100.0, 100.0),
+ &[
+ (rect(0.0, 0.0, 100.0, 90.0), None, ClipMode::ClipOut),
+ ],
+ &mut [
+ seg(0.0, 90.0, 100.0, 100.0, false, Some(
+ EdgeAaSegmentMask::LEFT |
+ EdgeAaSegmentMask::RIGHT |
+ EdgeAaSegmentMask::BOTTOM |
+ EdgeAaSegmentMask::TOP
+ )),
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_region_simple() {
+ seg_test(
+ rect(0.0, 0.0, 100.0, 100.0),
+ Some(rect(20.0, 40.0, 60.0, 80.0)),
+ rect(0.0, 0.0, 100.0, 100.0),
+ &[
+ ],
+ &mut [
+ seg_region(
+ 0.0, 0.0,
+ 20.0, 40.0,
+ 0, 0,
+ false,
+ Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::TOP)
+ ),
+
+ seg_region(
+ 20.0, 0.0,
+ 60.0, 40.0,
+ 1, 0,
+ false,
+ Some(EdgeAaSegmentMask::TOP)
+ ),
+
+ seg_region(
+ 60.0, 0.0,
+ 100.0, 40.0,
+ 2, 0,
+ false,
+ Some(EdgeAaSegmentMask::TOP | EdgeAaSegmentMask::RIGHT)
+ ),
+
+ seg_region(
+ 0.0, 40.0,
+ 20.0, 80.0,
+ 0, 1,
+ false,
+ Some(EdgeAaSegmentMask::LEFT)
+ ),
+
+ seg_region(
+ 20.0, 40.0,
+ 60.0, 80.0,
+ 1, 1,
+ false,
+ None,
+ ),
+
+ seg_region(
+ 60.0, 40.0,
+ 100.0, 80.0,
+ 2, 1,
+ false,
+ Some(EdgeAaSegmentMask::RIGHT)
+ ),
+
+ seg_region(
+ 0.0, 80.0,
+ 20.0, 100.0,
+ 0, 2,
+ false,
+ Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::BOTTOM)
+ ),
+
+ seg_region(
+ 20.0, 80.0,
+ 60.0, 100.0,
+ 1, 2,
+ false,
+ Some(EdgeAaSegmentMask::BOTTOM),
+ ),
+
+ seg_region(
+ 60.0, 80.0,
+ 100.0, 100.0,
+ 2, 2,
+ false,
+ Some(EdgeAaSegmentMask::RIGHT | EdgeAaSegmentMask::BOTTOM)
+ ),
+
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_region_clip() {
+ seg_test(
+ rect(0.0, 0.0, 100.0, 100.0),
+ Some(rect(20.0, 40.0, 60.0, 80.0)),
+ rect(0.0, 0.0, 100.0, 100.0),
+ &[
+ (rect(0.0, 0.0, 100.0, 90.0), None, ClipMode::ClipOut),
+ ],
+ &mut [
+ seg_region(
+ 0.0, 90.0,
+ 20.0, 100.0,
+ 0, 2,
+ false,
+ Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::BOTTOM | EdgeAaSegmentMask::TOP)
+ ),
+
+ seg_region(
+ 20.0, 90.0,
+ 60.0, 100.0,
+ 1, 2,
+ false,
+ Some(EdgeAaSegmentMask::BOTTOM | EdgeAaSegmentMask::TOP),
+ ),
+
+ seg_region(
+ 60.0, 90.0,
+ 100.0, 100.0,
+ 2, 2,
+ false,
+ Some(EdgeAaSegmentMask::RIGHT | EdgeAaSegmentMask::BOTTOM | EdgeAaSegmentMask::TOP)
+ ),
+
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_region_clip2() {
+ seg_test(
+ rect(0.0, 0.0, 100.0, 100.0),
+ Some(rect(20.0, 20.0, 80.0, 80.0)),
+ rect(0.0, 0.0, 100.0, 100.0),
+ &[
+ (rect(20.0, 20.0, 100.0, 100.0), None, ClipMode::ClipOut),
+ ],
+ &mut [
+ seg_region(
+ 0.0, 0.0,
+ 20.0, 20.0,
+ 0, 0,
+ false,
+ Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::TOP)
+ ),
+
+ seg_region(
+ 20.0, 0.0,
+ 80.0, 20.0,
+ 1, 0,
+ false,
+ Some(EdgeAaSegmentMask::TOP | EdgeAaSegmentMask::BOTTOM),
+ ),
+
+ seg_region(
+ 80.0, 0.0,
+ 100.0, 20.0,
+ 2, 0,
+ false,
+ Some(EdgeAaSegmentMask::RIGHT | EdgeAaSegmentMask::TOP | EdgeAaSegmentMask::BOTTOM)
+ ),
+
+ seg_region(
+ 0.0, 20.0,
+ 20.0, 80.0,
+ 0, 1,
+ false,
+ Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::RIGHT)
+ ),
+
+ seg_region(
+ 0.0, 80.0,
+ 20.0, 100.0,
+ 0, 2,
+ false,
+ Some(EdgeAaSegmentMask::LEFT | EdgeAaSegmentMask::BOTTOM | EdgeAaSegmentMask::RIGHT)
+ ),
+ ],
+ );
+ }
+
+ #[test]
+ fn segment_region_clip3() {
+ seg_test(
+ rect(0.0, 0.0, 100.0, 100.0),
+ Some(rect(20.0, 20.0, 80.0, 80.0)),
+ rect(0.0, 0.0, 100.0, 100.0),
+ &[
+ (rect(10.0, 10.0, 30.0, 30.0), None, ClipMode::Clip),
+ ],
+ &mut [
+ seg_region(
+ 10.0, 10.0,
+ 20.0, 20.0,
+ 0, 0,
+ false,
+ Some(EdgeAaSegmentMask::TOP | EdgeAaSegmentMask::LEFT),
+ ),
+
+ seg_region(
+ 20.0, 10.0,
+ 30.0, 20.0,
+ 1, 0,
+ false,
+ Some(EdgeAaSegmentMask::TOP | EdgeAaSegmentMask::RIGHT),
+ ),
+
+ seg_region(
+ 10.0, 20.0,
+ 20.0, 30.0,
+ 0, 1,
+ false,
+ Some(EdgeAaSegmentMask::BOTTOM | EdgeAaSegmentMask::LEFT),
+ ),
+
+ seg_region(
+ 20.0, 20.0,
+ 30.0, 30.0,
+ 1, 1,
+ false,
+ Some(EdgeAaSegmentMask::BOTTOM | EdgeAaSegmentMask::RIGHT),
+ ),
+ ],
+ );
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 11:11:56 +0000