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This will further guard that the framework won't forget to set the clip behavior. This has been tested with the flutter/flutter framework `flutter test --local-engine=host_debug_unopt` to ensure a successful engine roll.
63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "flutter/flow/layers/clip_rect_layer.h"
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namespace flow {
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ClipRectLayer::ClipRectLayer(Clip clip_behavior)
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: clip_behavior_(clip_behavior) {
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FML_DCHECK(clip_behavior != Clip::none);
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}
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ClipRectLayer::~ClipRectLayer() = default;
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void ClipRectLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) {
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SkRect previous_cull_rect = context->cull_rect;
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if (context->cull_rect.intersect(clip_rect_)) {
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SkRect child_paint_bounds = SkRect::MakeEmpty();
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PrerollChildren(context, matrix, &child_paint_bounds);
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if (child_paint_bounds.intersect(clip_rect_)) {
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set_paint_bounds(child_paint_bounds);
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}
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}
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context->cull_rect = previous_cull_rect;
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}
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#if defined(OS_FUCHSIA)
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void ClipRectLayer::UpdateScene(SceneUpdateContext& context) {
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FML_DCHECK(needs_system_composite());
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scenic::Rectangle shape(context.session(), // session
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clip_rect_.width(), // width
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clip_rect_.height() // height
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);
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// TODO(liyuqian): respect clip_behavior_
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SceneUpdateContext::Clip clip(context, shape, clip_rect_);
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UpdateSceneChildren(context);
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}
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#endif // defined(OS_FUCHSIA)
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void ClipRectLayer::Paint(PaintContext& context) const {
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TRACE_EVENT0("flutter", "ClipRectLayer::Paint");
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FML_DCHECK(needs_painting());
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SkAutoCanvasRestore save(context.internal_nodes_canvas, true);
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context.internal_nodes_canvas->clipRect(paint_bounds(),
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clip_behavior_ != Clip::hardEdge);
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if (clip_behavior_ == Clip::antiAliasWithSaveLayer) {
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context.internal_nodes_canvas->saveLayer(paint_bounds(), nullptr);
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}
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PaintChildren(context);
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if (clip_behavior_ == Clip::antiAliasWithSaveLayer) {
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context.internal_nodes_canvas->restore();
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}
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}
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} // namespace flow
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