Show perlin issue

src/effects/SkPerlinNoiseShader.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 "SkDither.h"
 #include "SkPerlinNoiseShader.h"
+#include "SkColorFilter.h"
 #include "SkFlattenableBuffers.h"
 #include "SkShader.h"
 #include "SkUnPreMultiply.h"
 #include "SkString.h"
 
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #include "GrCoordTransform.h"
 #include "gl/GrGLEffect.h"
 #include "GrTBackendEffectFactory.h"
@@ skipping 1268 matching lines @@
 
     const GrSimplexNoiseEffect& turbulence = drawEffect.castEffect<GrSimplexNoiseEffect>();
     uman.set1f(fSeedUni, turbulence.seed());
 }
 
 /////////////////////////////////////////////////////////////////////
 
 GrEffectRef* SkPerlinNoiseShader::asNewEffect(GrContext* context, const SkPaint& paint) const {
     SkASSERT(NULL != context);
 
+    if (0 == fNumOctaves) {
+        SkColor clearColor = 0;
+        if (kFractalNoise_Type == fType) {
+            clearColor = SkColorSetARGB(paint.getAlpha() / 2, 127, 127, 127);
+        }
+        SkAutoTUnref<SkColorFilter> cf(SkColorFilter::CreateModeFilter(

[bsalomon, 2013/11/05 20:30:22]

Ha.. ok.

+                                                clearColor, SkXfermode::kSrc_Mode));
+        return cf->asNewEffect(context);
+    }
+
     // Either we don't stitch tiles, either we have a valid tile size
     SkASSERT(!fStitchTiles || !fTileSize.isEmpty());
 
 #ifdef SK_USE_SIMPLEX_NOISE
     // Simplex noise is currently disabled but can be enabled by defining SK_USE_SIMPLEX_NOISE
     sk_ignore_unused_variable(context);
     GrEffectRef* effect =
         GrSimplexNoiseEffect::Create(fType, fPaintingData->fBaseFrequency,
                                      fNumOctaves, fStitchTiles, fSeed,
                                      this->getLocalMatrix(), paint.getAlpha());
@@ skipping 59 matching lines @@
     str->append(" seed: ");
     str->appendScalar(fSeed);
     str->append(" stitch tiles: ");
     str->append(fStitchTiles ? "true " : "false ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif