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d117ac979c
* Remove erroneous ChildView opacity * Wire frame metrics through contexts * Maintain layer stack inside of SceneBuilder * Remove EnsureSingleChild * Centralize system-composite and elevation logic * Wire up OpacityLayer to Scenic
56 lines
2.2 KiB
C++
56 lines
2.2 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/fuchsia_system_composited_layer.h"
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namespace flutter {
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FuchsiaSystemCompositedLayer::FuchsiaSystemCompositedLayer(SkColor color,
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SkAlpha opacity,
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float elevation)
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: ElevatedContainerLayer(elevation), color_(color), opacity_(opacity) {}
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void FuchsiaSystemCompositedLayer::Preroll(PrerollContext* context,
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const SkMatrix& matrix) {
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TRACE_EVENT0("flutter", "FuchsiaSystemCompositedLayer::Preroll");
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const float parent_is_opaque = context->is_opaque;
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context->mutators_stack.PushOpacity(opacity_);
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context->is_opaque = parent_is_opaque && (opacity_ == SK_AlphaOPAQUE);
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ElevatedContainerLayer::Preroll(context, matrix);
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context->is_opaque = parent_is_opaque;
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context->mutators_stack.Pop();
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}
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void FuchsiaSystemCompositedLayer::UpdateScene(SceneUpdateContext& context) {
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FML_DCHECK(needs_system_composite());
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// Retained rendering: speedup by reusing a retained entity node if
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// possible. When an entity node is reused, no paint layer is added to the
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// frame so we won't call Paint.
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LayerRasterCacheKey key(unique_id(), context.Matrix());
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if (context.HasRetainedNode(key)) {
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TRACE_EVENT_INSTANT0("flutter", "retained layer cache hit");
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const scenic::EntityNode& retained_node = context.GetRetainedNode(key);
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FML_DCHECK(context.top_entity());
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FML_DCHECK(retained_node.session() == context.session());
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context.top_entity()->embedder_node().AddChild(retained_node);
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return;
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}
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TRACE_EVENT_INSTANT0("flutter", "retained cache miss, creating");
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// If we can't find an existing retained surface, create one.
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SceneUpdateContext::Frame frame(context, rrect_, color_, opacity_ / 255.0f,
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elevation(), this);
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for (auto& layer : layers()) {
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if (layer->needs_painting()) {
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frame.AddPaintLayer(layer.get());
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}
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}
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ElevatedContainerLayer::UpdateScene(context);
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}
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} // namespace flutter
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