Add appendPrecisionModifier method to GrGLSLShaderBuilder

src/effects/SkBlurMaskFilter.cpp

 /*
  * Copyright 2006 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 "SkBlurMaskFilter.h"
 #include "SkBlurMask.h"
 #include "SkGpuBlurUtils.h"
@@ skipping 705 matching lines @@
 
 
 void GrGLRectBlurEffect::emitCode(EmitArgs& args) {
     const GrRectBlurEffect& rbe = args.fFp.cast<GrRectBlurEffect>();
 
     GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
 
     const char *rectName;
     const char *profileSizeName;
 
-    const char* precisionString = GrGLSLShaderVar::PrecisionString(args.fGLSLCaps, rbe.precision());
+    SkString precisionString;
+    if (args.fGLSLCaps->usesPrecisionModifiers()) {
+        precisionString.printf("%s ", GrGLSLPrecisionString(rbe.precision()));
+    }
     fProxyRectUniform = uniformHandler->addUniform(kFragment_GrShaderFlag,
                                                    kVec4f_GrSLType,
                                                    rbe.precision(),
                                                    "proxyRect",
                                                    &rectName);
     fProfileSizeUniform = uniformHandler->addUniform(kFragment_GrShaderFlag,
                                                      kFloat_GrSLType,
                                                      kDefault_GrSLPrecision,
                                                      "profileSize",
                                                      &profileSizeName);
 
     GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
     const char *fragmentPos = fragBuilder->fragmentPosition();
 
     if (args.fInputColor) {
         fragBuilder->codeAppendf("vec4 src=%s;", args.fInputColor);
     } else {
         fragBuilder->codeAppendf("vec4 src=vec4(1);");
     }
 
-    fragBuilder->codeAppendf("%s vec2 translatedPos = %s.xy - %s.xy;", precisionString, fragmentPos,
+    fragBuilder->codeAppendf("%s vec2 translatedPos = %s.xy - %s.xy;", precisionString.c_str(),
+                             fragmentPos, rectName);
+    fragBuilder->codeAppendf("%s float width = %s.z - %s.x;", precisionString.c_str(), rectName,
                              rectName);
-    fragBuilder->codeAppendf("%s float width = %s.z - %s.x;", precisionString, rectName, rectName);
-    fragBuilder->codeAppendf("%s float height = %s.w - %s.y;", precisionString, rectName, rectName);
+    fragBuilder->codeAppendf("%s float height = %s.w - %s.y;", precisionString.c_str(), rectName,
+                             rectName);
 
-    fragBuilder->codeAppendf("%s vec2 smallDims = vec2(width - %s, height - %s);", precisionString,
-                             profileSizeName, profileSizeName);
-    fragBuilder->codeAppendf("%s float center = 2.0 * floor(%s/2.0 + .25) - 1.0;", precisionString,
-                             profileSizeName);
-    fragBuilder->codeAppendf("%s vec2 wh = smallDims - vec2(center,center);", precisionString);
+    fragBuilder->codeAppendf("%s vec2 smallDims = vec2(width - %s, height - %s);",
+                             precisionString.c_str(), profileSizeName, profileSizeName);
+    fragBuilder->codeAppendf("%s float center = 2.0 * floor(%s/2.0 + .25) - 1.0;",
+                             precisionString.c_str(), profileSizeName);
+    fragBuilder->codeAppendf("%s vec2 wh = smallDims - vec2(center,center);",
+                             precisionString.c_str());
 
     OutputRectBlurProfileLookup(fragBuilder, args.fSamplers[0], "horiz_lookup", profileSizeName,
                                 "translatedPos.x", "width", "wh.x");
     OutputRectBlurProfileLookup(fragBuilder, args.fSamplers[0], "vert_lookup", profileSizeName,
                                 "translatedPos.y", "height", "wh.y");
 
     fragBuilder->codeAppendf("float final = horiz_lookup * vert_lookup;");
     fragBuilder->codeAppendf("%s = src * final;", args.fOutputColor);
 }
 
@@ skipping 542 matching lines @@
     } else {
         str->append("None");
     }
     str->append("))");
 }
 #endif
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkBlurMaskFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkBlurMaskFilterImpl)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END