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Document that OpacityLayer's children are nonempty (flutter/engine#8707)

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See https://github.com/flutter/flutter/issues/31517
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liyuqian 2019-04-23 15:02:57 -07:00 committed by GitHub
parent 0163a0e8dc
commit 39e920cd1a
1 changed files with 4 additions and 0 deletions
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4
engine/src/flutter/flow/layers/opacity_layer.h
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@ -9,6 +9,10 @@
namespace flutter {
// Don't add an OpacityLayer with no children to the layer tree. Painting an
// OpacityLayer is very costly due to the saveLayer call. If there's no child,
// having the OpacityLayer or not has the same effect. In debug_unopt build, the
// |EnsureSingleChild| will assert if there are no children.
class OpacityLayer : public ContainerLayer {
public:
OpacityLayer();