Bug 1388634 - Set correct sampling filter when pushing image. r=kats

MozReview-Commit-ID: BkKbL2l0AYb

--HG--
extra : rebase_source : 0fb6b785ddf00df2aa1452c3b16cbad3978386df

gfx/layers/wr/WebRenderLayerManager.cpp

@@ -368,9 +368,9 @@ WebRenderLayerManager::PushImage(nsDisplayItem* aItem,
     return false;
   }
 
-  wr::ImageRendering filter = wr::ImageRendering::Auto;
   auto r = aSc.ToRelativeLayoutRect(aRect);
-  aBuilder.PushImage(r, r, filter, key.value());
+  SamplingFilter sampleFilter = nsLayoutUtils::GetSamplingFilterForFrame(aItem->Frame());
+  aBuilder.PushImage(r, r, wr::ToImageRendering(sampleFilter), key.value());
 
   return true;
 }
@@ -557,9 +557,10 @@ WebRenderLayerManager::PushItemAsImage(nsDisplayItem* aItem,
   }
 
   wr::LayoutRect dest = aSc.ToRelativeLayoutRect(imageRect + offset);
+  SamplingFilter sampleFilter = nsLayoutUtils::GetSamplingFilterForFrame(aItem->Frame());
   aBuilder.PushImage(dest,
                      dest,
-                     wr::ImageRendering::Auto,
+                     wr::ToImageRendering(sampleFilter),
                      fallbackData->GetKey().value());
   return true;
 }

layout/painting/nsImageRenderer.cpp

@@ -657,9 +657,11 @@ nsImageRenderer::BuildWebRenderDisplayItems(nsPresContext*       aPresContext,
 
       LayoutDeviceSize gapSize = LayoutDeviceSize::FromAppUnits(
           aRepeatSize - aDest.Size(), appUnitsPerDevPixel);
+
+      SamplingFilter samplingFilter = nsLayoutUtils::GetSamplingFilterForFrame(mForFrame);
       aBuilder.PushImage(fill, clip,
                          wr::ToLayoutSize(destRect.Size()), wr::ToLayoutSize(gapSize),
-                         wr::ImageRendering::Auto, key.value());
+                         wr::ToImageRendering(samplingFilter), key.value());
       break;
     }
     default: