C++ (Cpp) ContainerLayer::CanUseOpaqueSurfaceの例

コード例 #1

bool
Layer::CanUseOpaqueSurface()
{
  // If the visible content in the layer is opaque, there is no need
  // for an alpha channel.
  if (GetContentFlags() & CONTENT_OPAQUE)
    return true;
  // Also, if this layer is the bottommost layer in a container which
  // doesn't need an alpha channel, we can use an opaque surface for this
  // layer too. Any transparent areas must be covered by something else
  // in the container.
  ContainerLayer* parent = GetParent();
  return parent && parent->GetFirstChild() == this &&
    parent->CanUseOpaqueSurface();
}