1// Copyright 2013 The Flutter Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "flutter/flow/layers/clip_path_layer.h"
6
7#if defined(LEGACY_FUCHSIA_EMBEDDER)
8
9#include "lib/ui/scenic/cpp/commands.h"
10
11#endif
12
13namespace flutter {
14
15ClipPathLayer::ClipPathLayer(const SkPath& clip_path, Clip clip_behavior)
16 : clip_path_(clip_path), clip_behavior_(clip_behavior) {
17 FML_DCHECK(clip_behavior != Clip::none);
18}
19
20void ClipPathLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) {
21 TRACE_EVENT0("flutter", "ClipPathLayer::Preroll");
22
23 SkRect previous_cull_rect = context->cull_rect;
24 SkRect clip_path_bounds = clip_path_.getBounds();
25 children_inside_clip_ = context->cull_rect.intersect(clip_path_bounds);
26 if (children_inside_clip_) {
27 TRACE_EVENT_INSTANT0("flutter", "children inside clip rect");
28
29 Layer::AutoPrerollSaveLayerState save =
30 Layer::AutoPrerollSaveLayerState::Create(context, UsesSaveLayer());
31 context->mutators_stack.PushClipPath(clip_path_);
32 SkRect child_paint_bounds = SkRect::MakeEmpty();
33 PrerollChildren(context, matrix, &child_paint_bounds);
34
35 if (child_paint_bounds.intersect(clip_path_bounds)) {
36 set_paint_bounds(child_paint_bounds);
37 }
38 context->mutators_stack.Pop();
39 }
40 context->cull_rect = previous_cull_rect;
41}
42
43#if defined(LEGACY_FUCHSIA_EMBEDDER)
44
45void ClipPathLayer::UpdateScene(SceneUpdateContext& context) {
46 TRACE_EVENT0("flutter", "ClipPathLayer::UpdateScene");
47 FML_DCHECK(needs_system_composite());
48
49 // TODO(liyuqian): respect clip_behavior_
50 SceneUpdateContext::Clip clip(context, clip_path_.getBounds());
51 UpdateSceneChildren(context);
52}
53
54#endif
55
56void ClipPathLayer::Paint(PaintContext& context) const {
57 TRACE_EVENT0("flutter", "ClipPathLayer::Paint");
58 FML_DCHECK(needs_painting());
59
60 if (!children_inside_clip_) {
61 TRACE_EVENT_INSTANT0("flutter", "children not inside clip rect, skipping");
62 return;
63 }
64
65 SkAutoCanvasRestore save(context.internal_nodes_canvas, true);
66 context.internal_nodes_canvas->clipPath(clip_path_,
67 clip_behavior_ != Clip::hardEdge);
68
69 if (UsesSaveLayer()) {
70 context.internal_nodes_canvas->saveLayer(paint_bounds(), nullptr);
71 }
72 PaintChildren(context);
73 if (UsesSaveLayer()) {
74 context.internal_nodes_canvas->restore();
75 }
76}
77
78} // namespace flutter
79