Fix case where GrGLEffectMatrix gives back a dangling ptr for the coords var name.

src/gpu/effects/GrTextureDomainEffect.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrTextureDomainEffect.h"
 #include "GrSimpleTextureEffect.h"
 #include "GrTBackendEffectFactory.h"
@@ skipping 32 matching lines @@
 }
 
 void GrGLTextureDomainEffect::emitCode(GrGLShaderBuilder* builder,
                                        const GrDrawEffect& drawEffect,
                                        EffectKey key,
                                        const char* outputColor,
                                        const char* inputColor,
                                        const TextureSamplerArray& samplers) {
     const GrTextureDomainEffect& texDom = drawEffect.castEffect<GrTextureDomainEffect>();
 
-    const char* coords;
+    SkString coords;
     fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, &coords);
     const char* domain;
     fNameUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
                                     kVec4f_GrSLType, "TexDom", &domain);
     if (GrTextureDomainEffect::kClamp_WrapMode == texDom.wrapMode()) {
 
         builder->fsCodeAppendf("\tvec2 clampCoord = clamp(%s, %s.xy, %s.zw);\n",
-                                coords, domain, domain);
+                                coords.c_str(), domain, domain);
 
         builder->fsCodeAppendf("\t%s = ", outputColor);
         builder->appendTextureLookupAndModulate(GrGLShaderBuilder::kFragment_ShaderType,
                                                 inputColor,
                                                 samplers[0],
                                                 "clampCoord");
         builder->fsCodeAppend(";\n");
     } else {
         SkASSERT(GrTextureDomainEffect::kDecal_WrapMode == texDom.wrapMode());
 
         if (kImagination_GrGLVendor == builder->ctxInfo().vendor()) {
             // On the NexusS and GalaxyNexus, the other path (with the 'any'
             // call) causes the compilation error "Calls to any function that
             // may require a gradient calculation inside a conditional block
             // may return undefined results". This appears to be an issue with
             // the 'any' call since even the simple "result=black; if (any())
             // result=white;" code fails to compile.
             builder->fsCodeAppend("\tvec4 outside = vec4(0.0, 0.0, 0.0, 0.0);\n");
             builder->fsCodeAppend("\tvec4 inside = ");
             builder->appendTextureLookupAndModulate(GrGLShaderBuilder::kFragment_ShaderType,
                                                     inputColor,
                                                     samplers[0],
-                                                    coords);
+                                                    coords.c_str());
             builder->fsCodeAppend(";\n");
 
             builder->fsCodeAppendf("\tfloat x = abs(2.0*(%s.x - %s.x)/(%s.z - %s.x) - 1.0);\n",
-                                   coords, domain, domain, domain);
+                                   coords.c_str(), domain, domain, domain);
             builder->fsCodeAppendf("\tfloat y = abs(2.0*(%s.y - %s.y)/(%s.w - %s.y) - 1.0);\n",
-                                   coords, domain, domain, domain);
+                                   coords.c_str(), domain, domain, domain);
             builder->fsCodeAppend("\tfloat blend = step(1.0, max(x, y));\n");
             builder->fsCodeAppendf("\t%s = mix(inside, outside, blend);\n", outputColor);
         } else {
             builder->fsCodeAppend("\tbvec4 outside;\n");
-            builder->fsCodeAppendf("\toutside.xy = lessThan(%s, %s.xy);\n", coords, domain);
-            builder->fsCodeAppendf("\toutside.zw = greaterThan(%s, %s.zw);\n", coords, domain);
+            builder->fsCodeAppendf("\toutside.xy = lessThan(%s, %s.xy);\n", coords.c_str(), domain);
+            builder->fsCodeAppendf("\toutside.zw = greaterThan(%s, %s.zw);\n", coords.c_str(), domain);
             builder->fsCodeAppendf("\t%s = any(outside) ? vec4(0.0, 0.0, 0.0, 0.0) : ", outputColor);
             builder->appendTextureLookupAndModulate(GrGLShaderBuilder::kFragment_ShaderType,
                                                     inputColor,
                                                     samplers[0],
-                                                    coords);
+                                                    coords.c_str());
             builder->fsCodeAppend(";\n");
         }
     }
 }
 
 void GrGLTextureDomainEffect::setData(const GrGLUniformManager& uman,
                                       const GrDrawEffect& drawEffect) {
     const GrTextureDomainEffect& texDom = drawEffect.castEffect<GrTextureDomainEffect>();
     const SkRect& domain = texDom.domain();
 
@@ skipping 122 matching lines @@
     const SkMatrix& matrix = GrEffectUnitTest::TestMatrix(random);
     bool bilerp = random->nextBool();
     CoordsType coords = random->nextBool() ? kLocal_CoordsType : kPosition_CoordsType;
     return GrTextureDomainEffect::Create(textures[texIdx],
                                          matrix,
                                          domain,
                                          wrapMode,
                                          bilerp ? GrTextureParams::kBilerp_FilterMode : GrTextureParams::kNone_FilterMode,
                                          coords);
 }