Use highp for distance field texture coord varyings.

src/gpu/effects/GrDistanceFieldTextureEffect.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 "GrDistanceFieldTextureEffect.h"
 #include "GrFontAtlasSizes.h"
 #include "GrInvariantOutput.h"
@@ skipping 32 matching lines @@
         GrGLGPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
         SkAssertResult(fsBuilder->enableFeature(
                 GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 
         GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
 
         // emit attributes
         vsBuilder->emitAttributes(dfTexEffect);
 
         GrGLVertToFrag st(kVec2f_GrSLType);
-        args.fPB->addVarying("IntTextureCoords", &st);
+        args.fPB->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision);
         vsBuilder->codeAppendf("%s = %s;", st.vsOut(), dfTexEffect.inTextureCoords()->fName);
         
         GrGLVertToFrag uv(kVec2f_GrSLType);
-        args.fPB->addVarying("TextureCoords", &uv);
+        args.fPB->addVarying("TextureCoords", &uv, kHigh_GrSLPrecision);
         // this is only used with text, so our texture bounds always match the glyph atlas
         vsBuilder->codeAppendf("%s = vec2(" GR_FONT_ATLAS_RECIP_WIDTH ", "
                                GR_FONT_ATLAS_RECIP_HEIGHT ")*%s;", uv.vsOut(),
                                dfTexEffect.inTextureCoords()->fName);
 
         // Setup pass through color
         this->setupColorPassThrough(pb, local.fInputColorType, args.fOutputColor,
                                     dfTexEffect.inColor(), &fColorUniform);
 
         // Setup position
@@ skipping 260 matching lines @@
         GrGLGPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
         SkAssertResult(fsBuilder->enableFeature(
                                      GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 
         GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
 
         // emit attributes
         vsBuilder->emitAttributes(dfTexEffect);
 
         GrGLVertToFrag v(kVec2f_GrSLType);
-        args.fPB->addVarying("TextureCoords", &v);
+        args.fPB->addVarying("TextureCoords", &v, kHigh_GrSLPrecision);
 
         // setup pass through color
         this->setupColorPassThrough(pb, local.fInputColorType, args.fOutputColor,
                                     dfTexEffect.inColor(), &fColorUniform);
 
         vsBuilder->codeAppendf("%s = %s;", v.vsOut(), dfTexEffect.inTextureCoords()->fName);
 
         // Setup position
         this->setupPosition(pb, gpArgs, dfTexEffect.inPosition()->fName, dfTexEffect.viewMatrix());
 
@@ skipping 220 matching lines @@
                 args.fGP.cast<GrDistanceFieldLCDTextureEffect>();
         const DistanceFieldLCDBatchTracker& local = args.fBT.cast<DistanceFieldLCDBatchTracker>();
         GrGLGPBuilder* pb = args.fPB;
 
         GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
 
         // emit attributes
         vsBuilder->emitAttributes(dfTexEffect);
 
         GrGLVertToFrag st(kVec2f_GrSLType);
-        args.fPB->addVarying("IntTextureCoords", &st);
+        args.fPB->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision);
         vsBuilder->codeAppendf("%s = %s;", st.vsOut(), dfTexEffect.inTextureCoords()->fName);
         
         GrGLVertToFrag uv(kVec2f_GrSLType);
-        args.fPB->addVarying("TextureCoords", &uv);
+        args.fPB->addVarying("TextureCoords", &uv, kHigh_GrSLPrecision);
         // this is only used with text, so our texture bounds always match the glyph atlas
         vsBuilder->codeAppendf("%s = vec2(" GR_FONT_ATLAS_RECIP_WIDTH ", "
                                GR_FONT_ATLAS_RECIP_HEIGHT ")*%s;", uv.vsOut(),
                                dfTexEffect.inTextureCoords()->fName);
         
         // setup pass through color
         this->setupColorPassThrough(pb, local.fInputColorType, args.fOutputColor, NULL,
                                     &fColorUniform);
 
         // Setup position
@@ skipping 262 matching lines @@
     uint32_t flags = kUseLCD_DistanceFieldEffectFlag;
     flags |= random->nextBool() ? kUniformScale_DistanceFieldEffectMask : 0;
     flags |= random->nextBool() ? kBGR_DistanceFieldEffectFlag : 0;
     return GrDistanceFieldLCDTextureEffect::Create(GrRandomColor(random),
                                                    GrProcessorUnitTest::TestMatrix(random),
                                                    textures[texIdx], params,
                                                    textures[texIdx2], params2,
                                                    textColor,
                                                    flags);
 }