Bug 1400382 - Implement CreateWebRenderCommands for nsDisplayTextOverflow. r=mstange

MozReview-Commit-ID: EQtFvLQCT2U

--HG--
extra : rebase_source : 12548860b96a7a700c793d9cc8c2164e32e568fb

layout/base/nsLayoutUtils.cpp

@@ -124,6 +124,7 @@
 #include "DisplayItemClip.h"
 #include "mozilla/layers/WebRenderLayerManager.h"
 #include "prenv.h"
+#include "TextDrawTarget.h"
 
 #ifdef MOZ_XUL
 #include "nsXULPopupManager.h"
@@ -6067,6 +6068,29 @@ nsLayoutUtils::PaintTextShadow(const nsIFrame* aFrame,
 
     nsPresContext* presCtx = aFrame->PresContext();
     nsContextBoxBlur contextBoxBlur;
+
+    nscolor shadowColor;
+    if (shadowDetails->mHasColor)
+      shadowColor = shadowDetails->mColor;
+    else
+      shadowColor = aForegroundColor;
+
+    // Webrender just needs the shadow details
+    if (auto* textDrawer = aContext->GetTextDrawer()) {
+      wr::TextShadow wrShadow;
+
+      wrShadow.offset = {
+        presCtx->AppUnitsToFloatDevPixels(shadowDetails->mXOffset),
+        presCtx->AppUnitsToFloatDevPixels(shadowDetails->mYOffset)
+      };
+
+      wrShadow.blur_radius = presCtx->AppUnitsToFloatDevPixels(shadowDetails->mRadius);
+      wrShadow.color = wr::ToColorF(ToDeviceColor(shadowColor));
+
+      textDrawer->AppendShadow(wrShadow);
+      return;
+    }
+
     gfxContext* shadowContext = contextBoxBlur.Init(shadowRect, 0, blurRadius,
                                                     presCtx->AppUnitsPerDevPixel(),
                                                     aDestCtx, aDirtyRect, nullptr,
@@ -6074,11 +6098,7 @@ nsLayoutUtils::PaintTextShadow(const nsIFrame* aFrame,
     if (!shadowContext)
       continue;
 
-    nscolor shadowColor;
-    if (shadowDetails->mHasColor)
-      shadowColor = shadowDetails->mColor;
-    else
-      shadowColor = aForegroundColor;
+    
 
     aDestCtx->Save();
     aDestCtx->NewPath();

layout/generic/TextOverflow.cpp

@@ -24,6 +24,7 @@
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/Likely.h"
 #include "nsISelection.h"
+#include "TextDrawTarget.h"
 
 namespace mozilla {
 namespace css {
@@ -208,6 +209,13 @@ public:
   }
   void PaintTextToContext(gfxContext* aCtx,
                           nsPoint aOffsetFromRect);
+
+  virtual bool CreateWebRenderCommands(mozilla::wr::DisplayListBuilder& aBuilder,
+                                       mozilla::wr::IpcResourceUpdateQueue& aResources,
+                                       const StackingContextHelper& aSc,
+                                       layers::WebRenderLayerManager* aManager,
+                                       nsDisplayListBuilder* aDisplayListBuilder) override;
+
   NS_DISPLAY_DECL_NAME("TextOverflow", TYPE_TEXT_OVERFLOW)
 private:
   nsRect          mRect;   // in reference frame coordinates
@@ -278,6 +286,43 @@ nsDisplayTextOverflowMarker::PaintTextToContext(gfxContext* aCtx,
   }
 }
 
+bool
+nsDisplayTextOverflowMarker::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder& aBuilder,
+                                                     mozilla::wr::IpcResourceUpdateQueue& aResources,
+                                                     const StackingContextHelper& aSc,
+                                                     layers::WebRenderLayerManager* aManager,
+                                                     nsDisplayListBuilder* aDisplayListBuilder)
+{
+  if (!aManager->IsLayersFreeTransaction() ||
+      !gfxPrefs::LayersAllowTextLayers() ||
+      !CanUseAdvancedLayer(aDisplayListBuilder->GetWidgetLayerManager())) {
+      return false;
+  }
+
+  bool snap;
+  nsRect bounds = GetBounds(aDisplayListBuilder, &snap);
+  if (bounds.IsEmpty()) {
+    return true;
+  }
+
+  // Run the rendering algorithm to capture the glyphs and shadows
+  RefPtr<TextDrawTarget> textDrawer = new TextDrawTarget();
+  RefPtr<gfxContext> captureCtx = gfxContext::CreateOrNull(textDrawer);
+  // TextOverflowMarker only draws glyphs
+  textDrawer->StartDrawing(TextDrawTarget::Phase::eGlyphs);
+  Paint(aDisplayListBuilder, captureCtx);
+
+  if (!textDrawer->CanSerializeFonts()) {
+    return false;
+  }
+
+  textDrawer->CreateWebRenderCommands(aBuilder, aSc, aManager, this, bounds);
+
+
+  return true;
+}
+
+
 TextOverflow::TextOverflow(nsDisplayListBuilder* aBuilder,
                            nsIFrame* aBlockFrame)
   : mContentArea(aBlockFrame->GetWritingMode(),