blob: b85b48fb082b62559edfa7343f7e2f5a8393bb22 [file] [log] [blame]
// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "flutter/flow/layers/clip_path_layer.h"
#if defined(OS_FUCHSIA)
#include "lib/ui/scenic/cpp/commands.h"
#endif // defined(OS_FUCHSIA)
namespace flutter {
ClipPathLayer::ClipPathLayer(const SkPath& clip_path, Clip clip_behavior)
: clip_path_(clip_path), clip_behavior_(clip_behavior) {
FML_DCHECK(clip_behavior != Clip::none);
}
void ClipPathLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) {
TRACE_EVENT0("flutter", "ClipPathLayer::Preroll");
SkRect previous_cull_rect = context->cull_rect;
SkRect clip_path_bounds = clip_path_.getBounds();
children_inside_clip_ = context->cull_rect.intersect(clip_path_bounds);
if (children_inside_clip_) {
TRACE_EVENT_INSTANT0("flutter", "children inside clip rect");
Layer::AutoPrerollSaveLayerState save =
Layer::AutoPrerollSaveLayerState::Create(context, UsesSaveLayer());
context->mutators_stack.PushClipPath(clip_path_);
SkRect child_paint_bounds = SkRect::MakeEmpty();
PrerollChildren(context, matrix, &child_paint_bounds);
if (child_paint_bounds.intersect(clip_path_bounds)) {
set_paint_bounds(child_paint_bounds);
}
context->mutators_stack.Pop();
}
context->cull_rect = previous_cull_rect;
}
#if defined(OS_FUCHSIA)
void ClipPathLayer::UpdateScene(SceneUpdateContext& context) {
TRACE_EVENT0("flutter", "ClipPathLayer::UpdateScene");
FML_DCHECK(needs_system_composite());
// TODO(liyuqian): respect clip_behavior_
SceneUpdateContext::Clip clip(context, clip_path_.getBounds());
UpdateSceneChildren(context);
}
#endif // defined(OS_FUCHSIA)
void ClipPathLayer::Paint(PaintContext& context) const {
TRACE_EVENT0("flutter", "ClipPathLayer::Paint");
FML_DCHECK(needs_painting());
if (!children_inside_clip_) {
TRACE_EVENT_INSTANT0("flutter", "children not inside clip rect, skipping");
return;
}
SkAutoCanvasRestore save(context.internal_nodes_canvas, true);
context.internal_nodes_canvas->clipPath(clip_path_,
clip_behavior_ != Clip::hardEdge);
if (UsesSaveLayer()) {
context.internal_nodes_canvas->saveLayer(paint_bounds(), nullptr);
}
PaintChildren(context);
if (UsesSaveLayer()) {
context.internal_nodes_canvas->restore();
}
}
} // namespace flutter