Refactoring ImageBuffer to decouple it from Canvas2DLayerBridge

Source/core/platform/graphics/filters/FETile.cpp

Index: Source/core/platform/graphics/filters/FETile.cpp
diff --git a/Source/core/platform/graphics/filters/FETile.cpp b/Source/core/platform/graphics/filters/FETile.cpp
index 44d9b749283aed242bbf21a1d767710743d7e97b..5140847c2c800cdb850eeb6a566c20fc50078f43 100644
--- a/Source/core/platform/graphics/filters/FETile.cpp
+++ b/Source/core/platform/graphics/filters/FETile.cpp
@@ -29,6 +29,8 @@
 #include "core/platform/graphics/GraphicsContext.h"
 #include "core/platform/graphics/Pattern.h"
 #include "core/platform/graphics/filters/SkiaImageFilterBuilder.h"
+#include "core/platform/graphics/gpu/AcceleratedImageBufferSurface.h"
+#include "platform/graphics/UnacceleratedImageBufferSurface.h"
 #include "platform/text/TextStream.h"
 #include "platform/transforms/AffineTransform.h"
 #include "third_party/skia/include/core/SkDevice.h"
@@ -66,15 +68,24 @@ void FETile::applySoftware()
         tileRect.scale(filter->filterResolution().width(), filter->filterResolution().height());
     }
 
-    OwnPtr<ImageBuffer> tileImage = ImageBuffer::createBufferForTile(tileRect.size(), tileRect.size(), filter()->renderingMode());
-    if (!tileImage)
+    OwnPtr<ImageBufferSurface> surface;
+    IntSize intTileSize = roundedIntSize(tileRect.size());
+    if (filter()->isAccelerated()) {
+        surface = adoptPtr(new AcceleratedImageBufferSurface(intTileSize));
+    }
+    if (!surface || !surface->isValid()) {
+        surface = adoptPtr(new UnacceleratedImageBufferSurface(intTileSize));
+    }
+    if (!surface->isValid())
         return;
+    ImageBuffer tileImage(surface.release());
 
-    GraphicsContext* tileImageContext = tileImage->context();
+    GraphicsContext* tileImageContext = tileImage.context();
+    tileImageContext->scale(FloatSize(intTileSize.width() / tileRect.width(), intTileSize.height() / tileRect.height()));
     tileImageContext->translate(-inMaxEffectLocation.x(), -inMaxEffectLocation.y());
     tileImageContext->drawImageBuffer(in->asImageBuffer(), in->absolutePaintRect().location());
 
-    RefPtr<Pattern> pattern = Pattern::create(tileImage->copyImage(CopyBackingStore), true, true);
+    RefPtr<Pattern> pattern = Pattern::create(tileImage.copyImage(CopyBackingStore), true, true);
 
     AffineTransform patternTransform;
     patternTransform.translate(inMaxEffectLocation.x() - maxEffectLocation.x(), inMaxEffectLocation.y() - maxEffectLocation.y());