Add canFilterMaskGPU & filterMaskGPU to SkMaskFilter

src/core/SkMaskFilter.cpp

Index: src/core/SkMaskFilter.cpp
===================================================================
--- src/core/SkMaskFilter.cpp	(revision 9864)
+++ src/core/SkMaskFilter.cpp	(working copy)
@@ -11,7 +11,11 @@
 #include "SkBlitter.h"
 #include "SkBounder.h"
 #include "SkDraw.h"
+#include "SkGr.h"
+#include "SkGrPixelRef.h"
 #include "SkRasterClip.h"
+#include "SkTypes.h"
+#include "GrTexture.h"
 
 
 SK_DEFINE_INST_COUNT(SkMaskFilter)
@@ -266,10 +270,60 @@
     return kUnimplemented_FilterReturn;
 }
 
-SkMaskFilter::BlurType SkMaskFilter::asABlur(BlurInfo*) const {
-    return kNone_BlurType;
+bool SkMaskFilter::asNewEffect(GrEffectRef** effect, GrTexture*) const {
+    return false;
 }
 
+bool SkMaskFilter::canFilterMaskGPU(const SkRect& devBounds, 
+                                    const SkIRect& clipBounds,
+                                    const SkMatrix& ctm,
+                                    SkRect* maskRect) const {
+    return false;
+}
+
+bool SkMaskFilter::filterMaskGPU(GrContext* context,
+                                 const SkBitmap& srcBM, 
+                                 const SkRect& maskRect, 
+                                 SkBitmap* resultBM) const {
+    SkAutoTUnref<GrTexture> src;
+    if (NULL == srcBM.getTexture()) {
+        GrTextureDesc desc;
+        desc.fConfig    = SkBitmapConfig2GrPixelConfig(srcBM.config());
+        desc.fWidth     = srcBM.width();
+        desc.fHeight    = srcBM.height();
+
+        SkAutoLockPixels alp(srcBM);
+
+        src.reset(context->createUncachedTexture(desc, 
+                                                 srcBM.getPixels(), 
+                                                 srcBM.rowBytes()));
+        if (NULL == src.get()) {
+            return false;
+        }
+    } else {
+        src.reset((GrTexture*) srcBM.getTexture());
+        src.get()->ref();
+    }
+    GrTexture* dst;
+
+    bool result = this->filterMaskGPU(src, maskRect, &dst, false);
+    if (!result) {
+        return false;
+    }
+
+    resultBM->setConfig(srcBM.config(), dst->width(), dst->height());
+    resultBM->setPixelRef(SkNEW_ARGS(SkGrPixelRef, (dst)))->unref();
+    dst->unref();
+    return true;
+}
+
+bool SkMaskFilter::filterMaskGPU(GrTexture* src, 
+                                 const SkRect& maskRect, 
+                                 GrTexture** result,
+                                 bool canOverwriteSrc) const {
+    return false;
+}
+
 void SkMaskFilter::computeFastBounds(const SkRect& src, SkRect* dst) const {
     SkMask  srcM, dstM;