Make filters use SkImage instead of SkBitmap

src/core/SkPaintPriv.cpp

Index: src/core/SkPaintPriv.cpp
diff --git a/src/core/SkPaintPriv.cpp b/src/core/SkPaintPriv.cpp
index c6957cd1cafe29ba19b76937a3d10999c7680927..c5422fa06bc359151b7e17e2a349f339b98c8508 100644
--- a/src/core/SkPaintPriv.cpp
+++ b/src/core/SkPaintPriv.cpp
@@ -9,6 +9,7 @@
 
 #include "SkBitmap.h"
 #include "SkColorFilter.h"
+#include "SkImage.h"
 #include "SkPaint.h"
 #include "SkShader.h"
 
@@ -49,3 +50,16 @@ bool isPaintOpaque(const SkPaint* paint, const SkBitmap* bmpReplacesShader) {
 
     return isPaintOpaque(paint, contentType);
 }
+
+bool isPaintOpaque(const SkPaint* paint, const SkImage* imageReplacesShader) {
+    SkPaintBitmapOpacity contentType;
+
+    if (!imageReplacesShader)
+        contentType = kNoBitmap_SkPaintBitmapOpacity;
+    else if (imageReplacesShader->isOpaque())
+        contentType = kOpaque_SkPaintBitmapOpacity;
+    else
+        contentType = kUnknown_SkPaintBitmapOpacity;
+
+    return isPaintOpaque(paint, contentType);
+}