Allow single-pass filters (which use asNewEffect()) to participate in the image filter DAG. This w…

src/effects/SkMatrixConvolutionImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMatrixConvolutionImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 542 matching lines @@
     return GrMatrixConvolutionEffect::Create(textures[texIdx],
                                              kernelSize,
                                              kernel.get(),
                                              gain,
                                              bias,
                                              target,
                                              tileMode,
                                              convolveAlpha);
 }
 
-bool SkMatrixConvolutionImageFilter::asNewEffect(GrEffectRef** effect,
-                                                 GrTexture* texture) const {
-    bool ok = fKernelSize.width() * fKernelSize.height() <= MAX_KERNEL_SIZE;
-    if (ok && effect) {
-        *effect = GrMatrixConvolutionEffect::Create(texture,
-                                                    fKernelSize,
-                                                    fKernel,
-                                                    fGain,
-                                                    fBias,
-                                                     fTarget,
-                                                     fTileMode,
-                                                     fConvolveAlpha);
-    }
-    return ok;
+bool SkMatrixConvolutionImageFilter::canFilterImageGPU() const {
+    return fKernelSize.width() * fKernelSize.height() <= MAX_KERNEL_SIZE;
+}
+
+GrEffectRef* SkMatrixConvolutionImageFilter::asNewEffect(GrTexture* texture) const {
+    SkASSERT(fKernelSize.width() * fKernelSize.height() <= MAX_KERNEL_SIZE);
+    return GrMatrixConvolutionEffect::Create(texture,
+                                             fKernelSize,
+                                             fKernel,
+                                             fGain,
+                                             fBias,
+                                             fTarget,
+                                             fTileMode,
+                                             fConvolveAlpha);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #endif