static Layer*
FindBackgroundLayer(ReadbackLayer* aLayer, nsIntPoint* aOffset)
{
gfx::Matrix transform;
if (!aLayer->GetTransform().Is2D(&transform) ||
transform.HasNonIntegerTranslation())
return nullptr;
nsIntPoint transformOffset(int32_t(transform._31), int32_t(transform._32));
for (Layer* l = aLayer->GetPrevSibling(); l; l = l->GetPrevSibling()) {
gfx::Matrix backgroundTransform;
if (!l->GetTransform().Is2D(&backgroundTransform) ||
gfx::ThebesMatrix(backgroundTransform).HasNonIntegerTranslation())
return nullptr;
nsIntPoint backgroundOffset(int32_t(backgroundTransform._31), int32_t(backgroundTransform._32));
IntRect rectInBackground(transformOffset - backgroundOffset, aLayer->GetSize());
const nsIntRegion visibleRegion = l->GetLocalVisibleRegion().ToUnknownRegion();
if (!visibleRegion.Intersects(rectInBackground))
continue;
// Since l is present in the background, from here on we either choose l
// or nothing.
if (!visibleRegion.Contains(rectInBackground))
return nullptr;
if (l->GetEffectiveOpacity() != 1.0 ||
l->HasMaskLayers() ||
!(l->GetContentFlags() & Layer::CONTENT_OPAQUE))
{
return nullptr;
}
// cliprects are post-transform
const Maybe<ParentLayerIntRect>& clipRect = l->GetLocalClipRect();
if (clipRect && !clipRect->Contains(ViewAs<ParentLayerPixel>(IntRect(transformOffset, aLayer->GetSize()))))
return nullptr;
Layer::LayerType type = l->GetType();
if (type != Layer::TYPE_COLOR && type != Layer::TYPE_PAINTED)
return nullptr;
*aOffset = backgroundOffset - transformOffset;
return l;
}
return nullptr;
}
IntRect
LayerMLGPU::GetClippedBoundingBox(RenderViewMLGPU* aView,
const Maybe<gfx::Polygon>& aGeometry)
{
MOZ_ASSERT(IsPrepared());
Layer* layer = GetLayer();
const Matrix4x4& transform = layer->GetEffectiveTransform();
Rect rect = aGeometry
? aGeometry->BoundingBox()
: Rect(layer->GetLocalVisibleRegion().GetBounds().ToUnknownRect());
rect = transform.TransformBounds(rect);
rect.MoveBy(-aView->GetTargetOffset());
rect = rect.Intersect(Rect(mComputedClipRect.ToUnknownRect()));
IntRect bounds;
rect.RoundOut();
rect.ToIntRect(&bounds);
return bounds;
}
