Distance field path optimizations and clean up.

src/gpu/effects/GrDistanceFieldTextureEffect.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDistanceFieldTextureEffect_DEFINED
 #define GrDistanceFieldTextureEffect_DEFINED
 
 #include "GrProcessor.h"
 #include "GrGeometryProcessor.h"
 
 class GrGLDistanceFieldTextureEffect;
 class GrGLDistanceFieldNoGammaTextureEffect;
 class GrGLDistanceFieldLCDTextureEffect;
 
 enum GrDistanceFieldEffectFlags {
     kSimilarity_DistanceFieldEffectFlag = 0x01,   // ctm is similarity matrix
     kRectToRect_DistanceFieldEffectFlag = 0x02,   // ctm maps rects to rects
     kUseLCD_DistanceFieldEffectFlag     = 0x04,   // use lcd text
     kBGR_DistanceFieldEffectFlag        = 0x08,   // lcd display has bgr order
     kPortrait_DistanceFieldEffectFlag   = 0x10,   // lcd display is in portrait mode (not used yet)
+
+    kInvalid_DistanceFieldEffectFlag    = 0x80,   // invalid state (for initialization)
     
     kUniformScale_DistanceFieldEffectMask = kSimilarity_DistanceFieldEffectFlag |
                                             kRectToRect_DistanceFieldEffectFlag,
     // The subset of the flags relevant to GrDistanceFieldTextureEffect
     kNonLCD_DistanceFieldEffectMask       = kSimilarity_DistanceFieldEffectFlag,
     // The subset of the flags relevant to GrDistanceFieldLCDTextureEffect
     kLCD_DistanceFieldEffectMask          = kSimilarity_DistanceFieldEffectFlag |
                                             kRectToRect_DistanceFieldEffectFlag |
                                             kUseLCD_DistanceFieldEffectFlag |
                                             kBGR_DistanceFieldEffectFlag,
@@ skipping 143 matching lines @@
     GrColor            fTextColor;
     uint32_t           fFlags;
     const GrShaderVar& fInTextureCoords;
 
     GR_DECLARE_GEOMETRY_PROCESSOR_TEST;
 
     typedef GrGeometryProcessor INHERITED;
 };
 
 #endif