void
BasicContainerLayer::ComputeEffectiveTransforms(const Matrix4x4& aTransformToSurface)
{
// We push groups for container layers if we need to, which always
// are aligned in device space, so it doesn't really matter how we snap
// containers.
Matrix residual;
Matrix4x4 idealTransform = GetLocalTransform() * aTransformToSurface;
idealTransform.ProjectTo2D();
if (!idealTransform.CanDraw2D()) {
mEffectiveTransform = idealTransform;
ComputeEffectiveTransformsForChildren(Matrix4x4());
ComputeEffectiveTransformForMaskLayer(Matrix4x4());
mUseIntermediateSurface = true;
return;
}
mEffectiveTransform = SnapTransformTranslation(idealTransform, &residual);
// We always pass the ideal matrix down to our children, so there is no
// need to apply any compensation using the residual from SnapTransformTranslation.
ComputeEffectiveTransformsForChildren(idealTransform);
ComputeEffectiveTransformForMaskLayer(aTransformToSurface);
Layer* child = GetFirstChild();
bool hasSingleBlendingChild = false;
if (!HasMultipleChildren() && child) {
hasSingleBlendingChild = child->GetMixBlendMode() != CompositionOp::OP_OVER;
}
/* If we have a single childand it is not blending,, it can just inherit our opacity,
* otherwise we need a PushGroup and we need to mark ourselves as using
* an intermediate surface so our children don't inherit our opacity
* via GetEffectiveOpacity.
* Having a mask layer always forces our own push group
* Having a blend mode also always forces our own push group
*/
mUseIntermediateSurface =
GetMaskLayer() ||
GetForceIsolatedGroup() ||
(GetMixBlendMode() != CompositionOp::OP_OVER && HasMultipleChildren()) ||
(GetEffectiveOpacity() != 1.0 && (HasMultipleChildren() || hasSingleBlendingChild));
}
void
BasicContainerLayer::ComputeEffectiveTransforms(const Matrix4x4& aTransformToSurface)
{
// We push groups for container layers if we need to, which always
// are aligned in device space, so it doesn't really matter how we snap
// containers.
Matrix residual;
Matrix4x4 idealTransform = GetLocalTransform() * aTransformToSurface;
if (!Extend3DContext() && !Is3DContextLeaf()) {
// For 3D transform leaked from extended parent layer.
idealTransform.ProjectTo2D();
}
if (!idealTransform.CanDraw2D()) {
if (!Extend3DContext() ||
(!idealTransform.Is2D() && Creates3DContextWithExtendingChildren())) {
if (!Creates3DContextWithExtendingChildren()) {
idealTransform.ProjectTo2D();
}
mEffectiveTransform = idealTransform;
ComputeEffectiveTransformsForChildren(Matrix4x4());
ComputeEffectiveTransformForMaskLayers(Matrix4x4());
mUseIntermediateSurface = true;
return;
}
mEffectiveTransform = idealTransform;
ComputeEffectiveTransformsForChildren(idealTransform);
ComputeEffectiveTransformForMaskLayers(idealTransform);
mUseIntermediateSurface = false;
return;
}
// With 2D transform or extended 3D context.
Layer* child = GetFirstChild();
bool hasSingleBlendingChild = false;
if (!HasMultipleChildren() && child) {
hasSingleBlendingChild = child->GetMixBlendMode() != CompositionOp::OP_OVER;
}
/* If we have a single childand it is not blending,, it can just inherit our opacity,
* otherwise we need a PushGroup and we need to mark ourselves as using
* an intermediate surface so our children don't inherit our opacity
* via GetEffectiveOpacity.
* Having a mask layer always forces our own push group
* Having a blend mode also always forces our own push group
*/
mUseIntermediateSurface =
GetMaskLayer() ||
GetForceIsolatedGroup() ||
(GetMixBlendMode() != CompositionOp::OP_OVER && HasMultipleChildren()) ||
(GetEffectiveOpacity() != 1.0 && (HasMultipleChildren() || hasSingleBlendingChild));
if (!Extend3DContext()) {
idealTransform.ProjectTo2D();
}
mEffectiveTransform =
!mUseIntermediateSurface ?
idealTransform : SnapTransformTranslation(idealTransform, &residual);
Matrix4x4 childTransformToSurface =
(!mUseIntermediateSurface ||
(mUseIntermediateSurface && !Extend3DContext() /* 2D */)) ?
idealTransform : Matrix4x4::From2D(residual);
ComputeEffectiveTransformsForChildren(childTransformToSurface);
ComputeEffectiveTransformForMaskLayers(aTransformToSurface);
}
