From 973de6713e3702b01bf2912e0c0210472748e074 Mon Sep 17 00:00:00 2001
From: Bas Schouten <bschouten@mozilla.com>
Date: Wed, 20 Sep 2017 14:57:25 +0200
Subject: [PATCH] Bug 1400573: Back out initial fix for bug 1392453. r=mchang

MozReview-Commit-ID: 3c3vJbL4kXS
---
 gfx/2d/DrawTargetD2D1.cpp | 39 +++++++--------------------------------
 gfx/2d/DrawTargetD2D1.h   | 10 ++--------
 2 files changed, 9 insertions(+), 40 deletions(-)

diff --git a/gfx/2d/DrawTargetD2D1.cpp b/gfx/2d/DrawTargetD2D1.cpp
index 2ad9240f039a..88dc187d80ca 100644
--- a/gfx/2d/DrawTargetD2D1.cpp
+++ b/gfx/2d/DrawTargetD2D1.cpp
@@ -238,8 +238,7 @@ DrawTargetD2D1::DrawSurface(SourceSurface *aSurface,
     mDC->FillRectangle(D2DRect(aDest), brush);
   }
 
-  Rect destBounds = mTransform.TransformBounds(aDest);
-  FinalizeDrawing(aOptions.mCompositionOp, ColorPattern(Color()), &destBounds);
+  FinalizeDrawing(aOptions.mCompositionOp, ColorPattern(Color()));
 }
 
 void
@@ -1345,7 +1344,7 @@ DrawTargetD2D1::PrepareForDrawing(CompositionOp aOp, const Pattern &aPattern)
 }
 
 void
-DrawTargetD2D1::FinalizeDrawing(CompositionOp aOp, const Pattern &aPattern, const Rect* aAffectedRect /* = nullptr */)
+DrawTargetD2D1::FinalizeDrawing(CompositionOp aOp, const Pattern &aPattern)
 {
   bool patternSupported = IsPatternSupportedByD2D(aPattern);
 
@@ -1408,25 +1407,15 @@ DrawTargetD2D1::FinalizeDrawing(CompositionOp aOp, const Pattern &aPattern, cons
       return;
     }
 
-    Point outOffset;
-    // We don't need to preserve the current content of this layer if the output
+    // We don't need to preserve the current content of this layer as the output
     // of the blend effect should completely replace it.
-    bool shouldPreserveContent = !!aAffectedRect && !aAffectedRect->Contains(Rect(0, 0, mSize.width, mSize.height));
-    RefPtr<ID2D1Image> tmpImage = GetImageForLayerContent(shouldPreserveContent, aAffectedRect, &outOffset);
+    RefPtr<ID2D1Image> tmpImage = GetImageForLayerContent(false);
     if (!tmpImage) {
       return;
     }
 
     blendEffect->SetInput(0, tmpImage);
     blendEffect->SetInput(1, source);
-
-    if (outOffset != Point()) {
-      RefPtr<ID2D1Effect> transformEffect;
-      mDC->CreateEffect(CLSID_D2D12DAffineTransform, getter_AddRefs(transformEffect));
-      transformEffect->SetInput(0, tmpImage);
-      transformEffect->SetValue(D2D1_2DAFFINETRANSFORM_PROP_TRANSFORM_MATRIX, D2D1::Matrix3x2F::Translation(outOffset.x, outOffset.y));
-      blendEffect->SetInputEffect(0, transformEffect);
-    }
     blendEffect->SetValue(D2D1_BLEND_PROP_MODE, D2DBlendMode(aOp));
 
     mDC->DrawImage(blendEffect, D2D1_INTERPOLATION_MODE_NEAREST_NEIGHBOR, D2D1_COMPOSITE_MODE_BOUNDED_SOURCE_COPY);
@@ -1518,14 +1507,10 @@ DrawTargetD2D1::GetDeviceSpaceClipRect(D2D1_RECT_F& aClipRect, bool& aIsPixelAli
 }
 
 already_AddRefed<ID2D1Image>
-DrawTargetD2D1::GetImageForLayerContent(bool aShouldPreserveContent, const Rect* aBounds /* = nullptr */, Point* aOutOffset /* = nullptr */) 
+DrawTargetD2D1::GetImageForLayerContent(bool aShouldPreserveContent)
 {
   PopAllClips();
 
-  if (aOutOffset) {
-    *aOutOffset = Point();
-  }
-
   if (!CurrentLayer().mCurrentList) {
     RefPtr<ID2D1Bitmap> tmpBitmap;
     HRESULT hr = mDC->CreateBitmap(D2DIntSize(mSize), D2D1::BitmapProperties(D2DPixelFormat(mFormat)), getter_AddRefs(tmpBitmap));
@@ -1555,20 +1540,10 @@ DrawTargetD2D1::GetImageForLayerContent(bool aShouldPreserveContent, const Rect*
         D2D1::BitmapProperties1(D2D1_BITMAP_OPTIONS_TARGET,
                                 D2D1::PixelFormat(DXGI_FORMAT_B8G8R8A8_UNORM,
                                                   D2D1_ALPHA_MODE_PREMULTIPLIED));
-      D2D1_SIZE_U size = mBitmap->GetPixelSize();
-      D2D1_POINT_2F offset = D2D1::Point2F();
-      if (aBounds) {
-        size.width = aBounds->width;
-        size.height = aBounds->height;
-        offset.x = -aBounds->x;
-        offset.y = -aBounds->y;
-        aOutOffset->x = aBounds->x;
-        aOutOffset->y = aBounds->y;
-      }
-      mDC->CreateBitmap(size, nullptr, 0, &props, getter_AddRefs(tmpBitmap));
+      mDC->CreateBitmap(mBitmap->GetPixelSize(), nullptr, 0, &props, getter_AddRefs(tmpBitmap));
       mDC->SetTransform(D2D1::IdentityMatrix());
       mDC->SetTarget(tmpBitmap);
-      mDC->DrawImage(list, offset, D2D1_INTERPOLATION_MODE_NEAREST_NEIGHBOR, D2D1_COMPOSITE_MODE_BOUNDED_SOURCE_COPY);
+      mDC->DrawImage(list, D2D1_INTERPOLATION_MODE_NEAREST_NEIGHBOR, D2D1_COMPOSITE_MODE_BOUNDED_SOURCE_COPY);
       mDC->SetTarget(CurrentTarget());
     }
 
diff --git a/gfx/2d/DrawTargetD2D1.h b/gfx/2d/DrawTargetD2D1.h
index f924f5495b74..3d9ac21cba29 100644
--- a/gfx/2d/DrawTargetD2D1.h
+++ b/gfx/2d/DrawTargetD2D1.h
@@ -180,9 +180,7 @@ private:
   void MarkChanged();
   bool ShouldClipTemporarySurfaceDrawing(CompositionOp aOp, const Pattern& aPattern, bool aClipIsComplex);
   void PrepareForDrawing(CompositionOp aOp, const Pattern &aPattern);
-  // aAffectedRect may be used to supply the bounds of the drawing operations in order to prevent
-  // excessive surface area being operated on
-  void FinalizeDrawing(CompositionOp aOp, const Pattern &aPattern, const Rect* aAffectedRect = nullptr);
+  void FinalizeDrawing(CompositionOp aOp, const Pattern &aPattern);
   void FlushTransformToDC() {
     if (mTransformDirty) {
       mDC->SetTransform(D2DMatrix(mTransform));
@@ -192,11 +190,7 @@ private:
   void AddDependencyOnSource(SourceSurfaceD2D1* aSource);
 
   // Must be called with all clips popped and an identity matrix set.
-  // aBounds can be specified to allow the function to return only part of the layer contents
-  // aOutOffset will return the offset that should be applied to move the ID2D1Image onto the
-  // correct portion of the destination layer. If !aBounds this will always be 0,0 and can be
-  // ignored.
-  already_AddRefed<ID2D1Image> GetImageForLayerContent(bool aShouldPreserveContent = true, const Rect* aBounds = nullptr, Point* aOutOffset = nullptr);
+  already_AddRefed<ID2D1Image> GetImageForLayerContent(bool aShouldPreserveContent = true);
 
   ID2D1Image* CurrentTarget()
   {