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Bug 1052063 - Small changes to clarify the existing ancestor transform build-up. r=botond

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This commit is contained in:
Kartikaya Gupta 2014-08-19 21:17:09 -04:00
parent 953ef9eefe
commit 1a2d62570d
2 changed files with 12 additions and 9 deletions
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19
gfx/layers/apz/src/APZCTreeManager.cpp
View File

@ -189,7 +189,7 @@ ComputeTouchSensitiveRegion(GeckoContentController* aController,
AsyncPanZoomController*
APZCTreeManager::UpdatePanZoomControllerTree(CompositorParent* aCompositor,
Layer* aLayer, uint64_t aLayersId,
Matrix4x4 aTransform,
const Matrix4x4& aAncestorTransform,
AsyncPanZoomController* aParent,
AsyncPanZoomController* aNextSibling,
bool aIsFirstPaint,
@ -283,7 +283,7 @@ APZCTreeManager::UpdatePanZoomControllerTree(CompositorParent* aCompositor,
apzc->SetScrollHandoffParentId(aLayer->GetScrollHandoffParentId());
nsIntRegion unobscured = ComputeTouchSensitiveRegion(state->mController, metrics, aObscured);
apzc->SetLayerHitTestData(unobscured, aTransform, transform);
apzc->SetLayerHitTestData(unobscured, aAncestorTransform, transform);
APZCTM_LOG("Setting region %s as visible region for APZC %p\n",
Stringify(unobscured).c_str(), apzc);
@ -366,11 +366,14 @@ APZCTreeManager::UpdatePanZoomControllerTree(CompositorParent* aCompositor,
// Accumulate the CSS transform between layers that have an APZC, but exclude any
// any layers that do have an APZC, and reset the accumulation at those layers.
if (apzc) {
aTransform = Matrix4x4();
} else {
// Multiply child layer transforms on the left so they get applied first
aTransform = transform * aTransform;
// In the terminology of the big comment above APZCTreeManager::GetInputTransforms, if
// we are at layer M, then aAncestorTransform is NC * OC, and we left-multiply MC and
// compute ancestorTransform to be MC * NC * OC. This gets passed down as the ancestor
// transform to layer L when we recurse into the children below. If we are at a layer
// with an APZC, such as P, then we leave the ancestorTransform empty to "reset" it.
Matrix4x4 ancestorTransform;
if (!apzc) {
ancestorTransform = transform * aAncestorTransform;
}
uint64_t childLayersId = (aLayer->AsRefLayer() ? aLayer->AsRefLayer()->GetReferentId() : aLayersId);
@ -397,7 +400,7 @@ APZCTreeManager::UpdatePanZoomControllerTree(CompositorParent* aCompositor,
AsyncPanZoomController* next = apzc ? nullptr : aNextSibling;
for (Layer* child = aLayer->GetLastChild(); child; child = child->GetPrevSibling()) {
gfx::TreeAutoIndent indent(mApzcTreeLog);
next = UpdatePanZoomControllerTree(aCompositor, child, childLayersId, aTransform, aParent, next,
next = UpdatePanZoomControllerTree(aCompositor, child, childLayersId, ancestorTransform, aParent, next,
aIsFirstPaint, aOriginatingLayersId,
aPaintLogger, aApzcsToDestroy, aApzcMap, obscured);

2
gfx/layers/apz/src/APZCTreeManager.h
View File

@ -370,7 +370,7 @@ private:
*/
AsyncPanZoomController* UpdatePanZoomControllerTree(CompositorParent* aCompositor,
Layer* aLayer, uint64_t aLayersId,
gfx::Matrix4x4 aTransform,
const gfx::Matrix4x4& aAncestorTransform,
AsyncPanZoomController* aParent,
AsyncPanZoomController* aNextSibling,
bool aIsFirstPaint,