Bug 1443792 - Remove direct access to AsyncPanZoomController from ContainerLayerComposite. r=botond

MozReview-Commit-ID: 7CiK7bzDcPW

--HG--
extra : rebase_source : 468e2c1e09fb03fdefc21262aeb93e7086eda50d

gfx/layers/apz/public/APZSampler.h

@@ -96,10 +96,13 @@ public:
       bool aScrollbarIsDescendant,
       AsyncTransformComponentMatrix* aOutClipTransform);
 
+  ParentLayerPoint GetCurrentAsyncScrollOffset(const LayerMetricsWrapper& aLayer);
   AsyncTransform GetCurrentAsyncTransform(const LayerMetricsWrapper& aLayer);
   AsyncTransformComponentMatrix GetOverscrollTransform(const LayerMetricsWrapper& aLayer);
+  AsyncTransformComponentMatrix GetCurrentAsyncTransformWithOverscroll(const LayerMetricsWrapper& aLayer);
 
   void MarkAsyncTransformAppliedToContent(const LayerMetricsWrapper& aLayer);
+  bool HasUnusedAsyncTransform(const LayerMetricsWrapper& aLayer);
 
 protected:
   virtual ~APZSampler();

gfx/layers/apz/src/APZSampler.cpp

@@ -166,6 +166,13 @@ APZSampler::ComputeTransformForScrollThumb(const LayerToParentLayerMatrix4x4& aC
                                               aOutClipTransform);
 }
 
+ParentLayerPoint
+APZSampler::GetCurrentAsyncScrollOffset(const LayerMetricsWrapper& aLayer)
+{
+  MOZ_ASSERT(aLayer.GetApzc());
+  return aLayer.GetApzc()->GetCurrentAsyncScrollOffset(AsyncPanZoomController::eForCompositing);
+}
+
 AsyncTransform
 APZSampler::GetCurrentAsyncTransform(const LayerMetricsWrapper& aLayer)
 {
@@ -180,6 +187,13 @@ APZSampler::GetOverscrollTransform(const LayerMetricsWrapper& aLayer)
   return aLayer.GetApzc()->GetOverscrollTransform(AsyncPanZoomController::eForCompositing);
 }
 
+AsyncTransformComponentMatrix
+APZSampler::GetCurrentAsyncTransformWithOverscroll(const LayerMetricsWrapper& aLayer)
+{
+  MOZ_ASSERT(aLayer.GetApzc());
+  return aLayer.GetApzc()->GetCurrentAsyncTransformWithOverscroll(AsyncPanZoomController::eForCompositing);
+}
+
 void
 APZSampler::MarkAsyncTransformAppliedToContent(const LayerMetricsWrapper& aLayer)
 {
@@ -187,5 +201,14 @@ APZSampler::MarkAsyncTransformAppliedToContent(const LayerMetricsWrapper& aLayer
   aLayer.GetApzc()->MarkAsyncTransformAppliedToContent();
 }
 
+bool
+APZSampler::HasUnusedAsyncTransform(const LayerMetricsWrapper& aLayer)
+{
+  AsyncPanZoomController* apzc = aLayer.GetApzc();
+  return apzc
+      && !apzc->GetAsyncTransformAppliedToContent()
+      && !AsyncTransformComponentMatrix(apzc->GetCurrentAsyncTransform(AsyncPanZoomController::eForHitTesting)).IsIdentity();
+}
+
 } // namespace layers
 } // namespace mozilla

gfx/layers/composite/ContainerLayerComposite.cpp

@@ -6,7 +6,6 @@
 
 #include "ContainerLayerComposite.h"
 #include <algorithm>                    // for min
-#include "apz/src/AsyncPanZoomController.h"  // for AsyncPanZoomController
 #include "FrameMetrics.h"               // for FrameMetrics
 #include "Units.h"                      // for LayerRect, LayerPixel, etc
 #include "CompositableHost.h"           // for CompositableHost
@@ -19,6 +18,7 @@
 #include "mozilla/gfx/Matrix.h"         // for Matrix4x4
 #include "mozilla/gfx/Point.h"          // for Point, IntPoint
 #include "mozilla/gfx/Rect.h"           // for IntRect, Rect
+#include "mozilla/layers/APZSampler.h"  // for APZSampler
 #include "mozilla/layers/Compositor.h"  // for Compositor, etc
 #include "mozilla/layers/CompositorTypes.h"  // for DiagnosticFlags::CONTAINER
 #include "mozilla/layers/Effects.h"     // for Effect, EffectChain, etc
@@ -286,21 +286,25 @@ ContainerPrepare(ContainerT* aContainer,
 }
 
 template<class ContainerT> void
-RenderMinimap(ContainerT* aContainer, LayerManagerComposite* aManager,
+RenderMinimap(ContainerT* aContainer,
+              const RefPtr<APZSampler>& aSampler,
+              LayerManagerComposite* aManager,
               const RenderTargetIntRect& aClipRect, Layer* aLayer)
 {
   Compositor* compositor = aManager->GetCompositor();
+  MOZ_ASSERT(aSampler);
 
   if (aLayer->GetScrollMetadataCount() < 1) {
     return;
   }
 
-  AsyncPanZoomController* controller = aLayer->GetAsyncPanZoomController(0);
-  if (!controller) {
+  LayerMetricsWrapper wrapper(aLayer, 0);
+  const FrameMetrics& fm = wrapper.Metrics();
+  if (!fm.IsScrollable()) {
     return;
   }
 
-  ParentLayerPoint scrollOffset = controller->GetCurrentAsyncScrollOffset(AsyncPanZoomController::eForCompositing);
+  ParentLayerPoint scrollOffset = aSampler->GetCurrentAsyncScrollOffset(wrapper);
 
   // Options
   const int verticalPadding = 10;
@@ -314,7 +318,6 @@ RenderMinimap(ContainerT* aContainer, LayerManagerComposite* aManager,
   gfx::Color viewPortColor(0, 0, 1.f, 0.3f);
 
   // Rects
-  const FrameMetrics& fm = aLayer->GetFrameMetrics(0);
   ParentLayerRect compositionBounds = fm.GetCompositionBounds();
   LayerRect scrollRect = fm.GetScrollableRect() * fm.LayersPixelsPerCSSPixel();
   LayerRect viewRect = ParentLayerRect(scrollOffset, compositionBounds.Size()) / LayerToParentLayerScale(1);
@@ -382,6 +385,11 @@ RenderLayers(ContainerT* aContainer, LayerManagerComposite* aManager,
 {
   Compositor* compositor = aManager->GetCompositor();
 
+  RefPtr<APZSampler> sampler;
+  if (CompositorBridgeParent* cbp = compositor->GetCompositorBridgeParent()) {
+    sampler = cbp->GetAPZSampler();
+  }
+
   for (size_t i = 0u; i < aContainer->mPrepared->mLayers.Length(); i++) {
     PreparedLayer& preparedData = aContainer->mPrepared->mLayers[i];
 
@@ -450,25 +458,26 @@ RenderLayers(ContainerT* aContainer, LayerManagerComposite* aManager,
     // frames higher up, so loop from the top down, and accumulate an async
     // transform as we go along.
     Matrix4x4 asyncTransform;
+    if (sampler) {
       for (uint32_t i = layer->GetScrollMetadataCount(); i > 0; --i) {
-      if (layer->GetFrameMetrics(i - 1).IsScrollable()) {
+        LayerMetricsWrapper wrapper(layer, i - 1);
+        if (wrapper.Metrics().IsScrollable()) {
           // Since the composition bounds are in the parent layer's coordinates,
           // use the parent's effective transform rather than the layer's own.
-        ParentLayerRect compositionBounds = layer->GetFrameMetrics(i - 1).GetCompositionBounds();
+          ParentLayerRect compositionBounds = wrapper.Metrics().GetCompositionBounds();
           aManager->GetCompositor()->DrawDiagnostics(DiagnosticFlags::CONTAINER,
                                                      compositionBounds.ToUnknownRect(),
                                                      aClipRect.ToUnknownRect(),
                                                      asyncTransform * aContainer->GetEffectiveTransform());
-        if (AsyncPanZoomController* apzc = layer->GetAsyncPanZoomController(i - 1)) {
           asyncTransform =
-              apzc->GetCurrentAsyncTransformWithOverscroll(AsyncPanZoomController::eForCompositing).ToUnknownMatrix()
+              sampler->GetCurrentAsyncTransformWithOverscroll(wrapper).ToUnknownMatrix()
               * asyncTransform;
         }
       }
-    }
 
       if (gfxPrefs::APZMinimap()) {
-      RenderMinimap(aContainer, aManager, aClipRect, layer);
+        RenderMinimap(aContainer, sampler, aManager, aClipRect, layer);
+      }
     }
 
     // invariant: our GL context should be current here, I don't think we can
@@ -605,19 +614,17 @@ ContainerRender(ContainerT* aContainer,
   // to any visible content. Display a warning box (conditioned on the FPS display being
   // enabled).
   if (gfxPrefs::LayersDrawFPS() && aContainer->IsScrollableWithoutContent()) {
+    RefPtr<APZSampler> sampler = aManager->GetCompositor()->GetCompositorBridgeParent()->GetAPZSampler();
     // Since aContainer doesn't have any children we can just iterate from the top metrics
     // on it down to the bottom using GetFirstChild and not worry about walking onto another
     // underlying layer.
     for (LayerMetricsWrapper i(aContainer); i; i = i.GetFirstChild()) {
-      if (AsyncPanZoomController* apzc = i.GetApzc()) {
-        if (!apzc->GetAsyncTransformAppliedToContent()
-            && !AsyncTransformComponentMatrix(apzc->GetCurrentAsyncTransform(AsyncPanZoomController::eForHitTesting)).IsIdentity()) {
+      if (sampler->HasUnusedAsyncTransform(i)) {
         aManager->UnusedApzTransformWarning();
         break;
       }
     }
   }
-  }
 }
 
 ContainerLayerComposite::ContainerLayerComposite(LayerManagerComposite *aManager)

gfx/layers/composite/ContainerLayerComposite.h

@@ -16,6 +16,7 @@
 namespace mozilla {
 namespace layers {
 
+class APZSampler;
 class CompositableHost;
 class CompositingRenderTarget;
 struct PreparedData;
@@ -54,7 +55,9 @@ class ContainerLayerComposite : public ContainerLayer,
                         const RenderTargetIntRect& aClipRect);
 
   template<class ContainerT>
-  void RenderMinimap(ContainerT* aContainer, LayerManagerComposite* aManager,
+  void RenderMinimap(ContainerT* aContainer,
+                     const RefPtr<APZSampler>& aSampler,
+                     LayerManagerComposite* aManager,
                      const RenderTargetIntRect& aClipRect, Layer* aLayer);
 public:
   explicit ContainerLayerComposite(LayerManagerComposite *aManager);