Factory methods for heap-allocated SkImageFilter objects.

src/effects/SkDisplacementMapEffect.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDisplacementMapEffect.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkUnPreMultiply.h"
 #include "SkColorPriv.h"
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #include "GrCoordTransform.h"
 #include "gl/GrGLEffect.h"
 #include "GrTBackendEffectFactory.h"
 #include "SkImageFilterUtils.h"
 #endif
 
 namespace {
 
+#define kChannelSelectorKeyBits 3; // Max value is 4, so 3 bits are required at most
+
 template<SkDisplacementMapEffect::ChannelSelectorType type>
 uint32_t getValue(SkColor, const SkUnPreMultiply::Scale*) {
     SkDEBUGFAIL("Unknown channel selector");
     return 0;
 }
 
 template<> uint32_t getValue<SkDisplacementMapEffect::kR_ChannelSelectorType>(
     SkColor l, const SkUnPreMultiply::Scale* table) {
     return SkUnPreMultiply::ApplyScale(table[SkGetPackedA32(l)], SkGetPackedR32(l));
 }
@@ skipping 561 matching lines @@
                colorTex->origin() == kTopLeft_GrSurfaceOrigin ?
                SkScalarToFloat(scaleY) : SkScalarToFloat(-scaleY));
 }
 
 GrGLEffect::EffectKey GrGLDisplacementMapEffect::GenKey(const GrDrawEffect& drawEffect,
                                                         const GrGLCaps&) {
     const GrDisplacementMapEffect& displacementMap =
         drawEffect.castEffect<GrDisplacementMapEffect>();
 
     EffectKey xKey = displacementMap.xChannelSelector();
-    EffectKey yKey = displacementMap.yChannelSelector() << SkDisplacementMapEffect::kKeyBits;
+    EffectKey yKey = displacementMap.yChannelSelector() << kChannelSelectorKeyBits;
 
     return xKey | yKey;
 }
 #endif