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_rect_layer.h" |
6 | |
7 | namespace flutter { |
8 | |
9 | ClipRectLayer::ClipRectLayer(const SkRect& clip_rect, Clip clip_behavior) |
10 | : clip_rect_(clip_rect), clip_behavior_(clip_behavior) { |
11 | FML_DCHECK(clip_behavior != Clip::none); |
12 | } |
13 | |
14 | void ClipRectLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) { |
15 | TRACE_EVENT0("flutter" , "ClipRectLayer::Preroll" ); |
16 | |
17 | SkRect previous_cull_rect = context->cull_rect; |
18 | children_inside_clip_ = context->cull_rect.intersect(clip_rect_); |
19 | if (children_inside_clip_) { |
20 | TRACE_EVENT_INSTANT0("flutter" , "children inside clip rect" ); |
21 | |
22 | Layer::AutoPrerollSaveLayerState save = |
23 | Layer::AutoPrerollSaveLayerState::Create(context, UsesSaveLayer()); |
24 | context->mutators_stack.PushClipRect(clip_rect_); |
25 | SkRect child_paint_bounds = SkRect::MakeEmpty(); |
26 | PrerollChildren(context, matrix, &child_paint_bounds); |
27 | |
28 | if (child_paint_bounds.intersect(clip_rect_)) { |
29 | set_paint_bounds(child_paint_bounds); |
30 | } |
31 | context->mutators_stack.Pop(); |
32 | } |
33 | context->cull_rect = previous_cull_rect; |
34 | } |
35 | |
36 | #if defined(LEGACY_FUCHSIA_EMBEDDER) |
37 | |
38 | void ClipRectLayer::UpdateScene(SceneUpdateContext& context) { |
39 | TRACE_EVENT0("flutter" , "ClipRectLayer::UpdateScene" ); |
40 | FML_DCHECK(needs_system_composite()); |
41 | |
42 | // TODO(liyuqian): respect clip_behavior_ |
43 | SceneUpdateContext::Clip clip(context, clip_rect_); |
44 | UpdateSceneChildren(context); |
45 | } |
46 | |
47 | #endif |
48 | |
49 | void ClipRectLayer::Paint(PaintContext& context) const { |
50 | TRACE_EVENT0("flutter" , "ClipRectLayer::Paint" ); |
51 | FML_DCHECK(needs_painting()); |
52 | |
53 | if (!children_inside_clip_) { |
54 | TRACE_EVENT_INSTANT0("flutter" , "children not inside clip rect, skipping" ); |
55 | return; |
56 | } |
57 | |
58 | SkAutoCanvasRestore save(context.internal_nodes_canvas, true); |
59 | context.internal_nodes_canvas->clipRect(clip_rect_, |
60 | clip_behavior_ != Clip::hardEdge); |
61 | |
62 | if (UsesSaveLayer()) { |
63 | context.internal_nodes_canvas->saveLayer(clip_rect_, nullptr); |
64 | } |
65 | PaintChildren(context); |
66 | if (UsesSaveLayer()) { |
67 | context.internal_nodes_canvas->restore(); |
68 | } |
69 | } |
70 | |
71 | } // namespace flutter |
72 | |