// Go down shadow layer tree and apply transformations for scrollable layers.
static void
TransformShadowTree(nsDisplayListBuilder* aBuilder, nsFrameLoader* aFrameLoader,
nsIFrame* aFrame, Layer* aLayer,
const ViewTransform& aTransform)
{
ShadowLayer* shadow = aLayer->AsShadowLayer();
shadow->SetShadowClipRect(aLayer->GetClipRect());
shadow->SetShadowVisibleRegion(aLayer->GetVisibleRegion());
const FrameMetrics* metrics = GetFrameMetrics(aLayer);
gfx3DMatrix shadowTransform;
ViewTransform layerTransform = aTransform;
if (metrics && metrics->IsScrollable()) {
const ViewID scrollId = metrics->mScrollId;
const nsContentView* view =
aFrameLoader->GetCurrentRemoteFrame()->GetContentView(scrollId);
NS_ABORT_IF_FALSE(view, "Array of views should be consistent with layer tree");
const gfx3DMatrix& currentTransform = aLayer->GetTransform();
ViewTransform viewTransform = ComputeShadowTreeTransform(
aFrame, aFrameLoader, metrics, view->GetViewConfig(),
1 / (GetXScale(currentTransform)*layerTransform.mXScale),
1 / (GetYScale(currentTransform)*layerTransform.mYScale)
);
// Apply the layer's own transform *before* the view transform
shadowTransform = gfx3DMatrix(viewTransform) * currentTransform;
if (metrics->IsRootScrollable()) {
layerTransform.mTranslation = viewTransform.mTranslation;
// Apply the root frame translation *before* we do the rest of the transforms.
nsIntPoint rootFrameOffset = GetRootFrameOffset(aFrame, aBuilder);
shadowTransform = shadowTransform *
gfx3DMatrix::Translation(float(rootFrameOffset.x), float(rootFrameOffset.y), 0.0);
layerTransform.mXScale *= GetXScale(currentTransform);
layerTransform.mYScale *= GetYScale(currentTransform);
}
} else {
shadowTransform = aLayer->GetTransform();
}
if (aLayer->GetIsFixedPosition() &&
!aLayer->GetParent()->GetIsFixedPosition()) {
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);
for (Layer* child = aLayer->GetFirstChild();
child; child = child->GetNextSibling()) {
TransformShadowTree(aBuilder, aFrameLoader, aFrame, child, layerTransform);
}
}
// Go down shadow layer tree and apply transformations for scrollable layers.
static void
TransformShadowTree(nsDisplayListBuilder* aBuilder, nsFrameLoader* aFrameLoader,
nsIFrame* aFrame, Layer* aLayer,
const ViewTransform& aTransform,
float aTempScaleDiffX = 1.0,
float aTempScaleDiffY = 1.0)
{
ShadowLayer* shadow = aLayer->AsShadowLayer();
shadow->SetShadowClipRect(aLayer->GetClipRect());
shadow->SetShadowVisibleRegion(aLayer->GetVisibleRegion());
shadow->SetShadowOpacity(aLayer->GetOpacity());
const FrameMetrics* metrics = GetFrameMetrics(aLayer);
gfx3DMatrix shadowTransform = aLayer->GetTransform();
ViewTransform layerTransform = aTransform;
if (metrics && metrics->IsScrollable()) {
const ViewID scrollId = metrics->mScrollId;
const nsContentView* view =
aFrameLoader->GetCurrentRemoteFrame()->GetContentView(scrollId);
NS_ABORT_IF_FALSE(view, "Array of views should be consistent with layer tree");
const gfx3DMatrix& currentTransform = aLayer->GetTransform();
const ViewConfig& config = view->GetViewConfig();
// With temporary scale we should compensate translation
// using temporary scale value
aTempScaleDiffX *= GetXScale(shadowTransform) * config.mXScale;
aTempScaleDiffY *= GetYScale(shadowTransform) * config.mYScale;
ViewTransform viewTransform = ComputeShadowTreeTransform(
aFrame, aFrameLoader, metrics, view->GetViewConfig(),
aTempScaleDiffX, aTempScaleDiffY
);
// Apply the layer's own transform *before* the view transform
shadowTransform = gfx3DMatrix(viewTransform) * currentTransform;
layerTransform = viewTransform;
if (metrics->IsRootScrollable()) {
// Apply the translation *before* we do the rest of the transforms.
nsIntPoint offset = GetContentRectLayerOffset(aFrame, aBuilder);
shadowTransform = shadowTransform *
gfx3DMatrix::Translation(float(offset.x), float(offset.y), 0.0);
}
}
if (aLayer->GetIsFixedPosition() &&
!aLayer->GetParent()->GetIsFixedPosition()) {
// Alter the shadow transform of fixed position layers in the situation
// that the view transform's scroll position doesn't match the actual
// scroll position, due to asynchronous layer scrolling.
float offsetX = layerTransform.mTranslation.x / layerTransform.mXScale;
float offsetY = layerTransform.mTranslation.y / layerTransform.mYScale;
ReverseTranslate(shadowTransform, gfxPoint(offsetX, offsetY));
const nsIntRect* clipRect = shadow->GetShadowClipRect();
if (clipRect) {
nsIntRect transformedClipRect(*clipRect);
transformedClipRect.MoveBy(-offsetX, -offsetY);
shadow->SetShadowClipRect(&transformedClipRect);
}
}
// The transform already takes the resolution scale into account. Since we
// will apply the resolution scale again when computing the effective
// transform, we must apply the inverse resolution scale here.
if (ContainerLayer* c = aLayer->AsContainerLayer()) {
shadowTransform.Scale(1.0f/c->GetPreXScale(),
1.0f/c->GetPreYScale(),
1);
}
shadowTransform.ScalePost(1.0f/aLayer->GetPostXScale(),
1.0f/aLayer->GetPostYScale(),
1);
shadow->SetShadowTransform(shadowTransform);
for (Layer* child = aLayer->GetFirstChild();
child; child = child->GetNextSibling()) {
TransformShadowTree(aBuilder, aFrameLoader, aFrame, child, layerTransform,
aTempScaleDiffX, aTempScaleDiffY);
}
}