blob: cc58e721c7f751d3ee3f35cef4e81a1eab422fe9 [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_rect_layer.h"
namespace flutter {
ClipRectLayer::ClipRectLayer(const SkRect& clip_rect, Clip clip_behavior)
: clip_rect_(clip_rect), clip_behavior_(clip_behavior) {
FML_DCHECK(clip_behavior != Clip::none);
}
void ClipRectLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) {
TRACE_EVENT0("flutter", "ClipRectLayer::Preroll");
SkRect previous_cull_rect = context->cull_rect;
children_inside_clip_ = context->cull_rect.intersect(clip_rect_);
if (children_inside_clip_) {
TRACE_EVENT_INSTANT0("flutter", "children inside clip rect");
Layer::AutoPrerollSaveLayerState save =
Layer::AutoPrerollSaveLayerState::Create(context, UsesSaveLayer());
context->mutators_stack.PushClipRect(clip_rect_);
SkRect child_paint_bounds = SkRect::MakeEmpty();
PrerollChildren(context, matrix, &child_paint_bounds);
if (child_paint_bounds.intersect(clip_rect_)) {
set_paint_bounds(child_paint_bounds);
}
context->mutators_stack.Pop();
}
context->cull_rect = previous_cull_rect;
}
#if defined(OS_FUCHSIA)
void ClipRectLayer::UpdateScene(SceneUpdateContext& context) {
TRACE_EVENT0("flutter", "ClipRectLayer::UpdateScene");
FML_DCHECK(needs_system_composite());
// TODO(liyuqian): respect clip_behavior_
SceneUpdateContext::Clip clip(context, clip_rect_);
UpdateSceneChildren(context);
}
#endif // defined(OS_FUCHSIA)
void ClipRectLayer::Paint(PaintContext& context) const {
TRACE_EVENT0("flutter", "ClipRectLayer::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->clipRect(clip_rect_,
clip_behavior_ != Clip::hardEdge);
if (UsesSaveLayer()) {
context.internal_nodes_canvas->saveLayer(clip_rect_, nullptr);
}
PaintChildren(context);
if (UsesSaveLayer()) {
context.internal_nodes_canvas->restore();
}
}
} // namespace flutter