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Clean up the compositor's transformation calculations.

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This commit is contained in:
Ali Juma 2012-02-17 17:58:03 -05:00
parent 5c31abc8d9
commit 5c0f454c22
2 changed files with 18 additions and 57 deletions
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59
gfx/layers/ipc/CompositorParent.cpp
View File

@ -184,10 +184,8 @@ CompositorParent::Composite()
#ifdef MOZ_WIDGET_ANDROID
RequestViewTransform();
Layer* layer = GetPrimaryScrollableLayer();
printf_stderr("Correcting for position fixed %i, %i\n", -mScrollOffset.x, -mScrollOffset.y);
ViewTransform v(mScrollOffset, mXScale, mYScale);
TransformShadowTree(layer, v);
TransformShadowTree();
#endif
mLayerManager->EndEmptyTransaction();
@ -259,67 +257,32 @@ static double GetYScale(const gfx3DMatrix& aTransform)
return aTransform._22;
}
static void ReverseTranslate(gfx3DMatrix& aTransform, ViewTransform& aViewTransform)
{
aTransform._41 -= aViewTransform.mTranslation.x / aViewTransform.mXScale;
aTransform._42 -= aViewTransform.mTranslation.y / aViewTransform.mYScale;
}
void
CompositorParent::TransformShadowTree(Layer* aLayer, const ViewTransform& aTransform,
float aTempScaleDiffX, float aTempScaleDiffY)
CompositorParent::TransformShadowTree()
{
ShadowLayer* shadow = aLayer->AsShadowLayer();
Layer* layer = GetPrimaryScrollableLayer();
ShadowLayer* shadow = layer->AsShadowLayer();
gfx3DMatrix shadowTransform = aLayer->GetTransform();
ViewTransform layerTransform = aTransform;
gfx3DMatrix shadowTransform = layer->GetTransform();
ContainerLayer* container = aLayer->AsContainerLayer();
ContainerLayer* container = layer->AsContainerLayer();
if (container && container->GetFrameMetrics().IsScrollable()) {
const FrameMetrics* metrics = &container->GetFrameMetrics();
const gfx3DMatrix& currentTransform = aLayer->GetTransform();
const gfx3DMatrix& currentTransform = layer->GetTransform();
aTempScaleDiffX *= GetXScale(mLayerManager->GetRoot()->GetTransform()) * mXScale;
aTempScaleDiffY *= GetYScale(mLayerManager->GetRoot()->GetTransform()) * mYScale;
float tempScaleDiffX = GetXScale(mLayerManager->GetRoot()->GetTransform()) * mXScale;
float tempScaleDiffY = GetYScale(mLayerManager->GetRoot()->GetTransform()) * mYScale;
nsIntPoint metricsScrollOffset = metrics->mViewportScrollOffset;
nsIntPoint scrollCompensation(
(mScrollOffset.x / aTempScaleDiffX - metricsScrollOffset.x) * mXScale,
(mScrollOffset.y / aTempScaleDiffY - metricsScrollOffset.y) * mYScale);
(mScrollOffset.x / tempScaleDiffX - metricsScrollOffset.x) * mXScale,
(mScrollOffset.y / tempScaleDiffY - metricsScrollOffset.y) * mYScale);
ViewTransform treeTransform(-scrollCompensation, mXScale,
mYScale);
shadowTransform = gfx3DMatrix(treeTransform) * currentTransform;
layerTransform = treeTransform;
}
// Uncomment to deal with position:fixed.
/*
if (aLayer->GetIsFixedPosition() &&
!aLayer->GetParent()->GetIsFixedPosition()) {
printf_stderr("Correcting for position fixed\n");
ReverseTranslate(shadowTransform, layerTransform);
const nsIntRect* clipRect = shadow->GetShadowClipRect();
if (clipRect) {
nsIntRect transformedClipRect(*clipRect);
transformedClipRect.MoveBy(shadowTransform._41, shadowTransform._42);
shadow->SetShadowClipRect(&transformedClipRect);
}
}*/
shadow->SetShadowTransform(shadowTransform);
// Uncomment the following when we want to deal with position:fixed.
// Note that we need to modify other code to ensure that position:fixed
// things get their own layer. See Bug 607417.
/*
for (Layer* child = aLayer->GetFirstChild(); child;
child = child->GetNextSibling()) {
TransformShadowTree(child, layerTransform, aTempScaleDiffX,
aTempScaleDiffY);
}*/
}
void

4
gfx/layers/ipc/CompositorParent.h
View File

@ -114,9 +114,7 @@ private:
void Composite();
void ScheduleComposition();
void TransformShadowTree(Layer* aLayer, const ViewTransform& aTransform,
float aTempScaleDiffX = 1.0,
float aTempScaleDiffY = 1.0);
void TransformShadowTree();
// Platform specific functions
#ifdef MOZ_WIDGET_ANDROID