Add GrEllipseEdgeEffect

src/gpu/GrTextContext.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
 #include "GrTextContext.h"
 #include "GrAtlas.h"
 #include "GrContext.h"
 #include "GrDrawTarget.h"
 #include "GrFontScaler.h"
 #include "GrIndexBuffer.h"
 #include "GrTextStrike.h"
 #include "GrTextStrike_impl.h"
 #include "SkPath.h"
 #include "SkStrokeRec.h"
 
 enum {
+    // glyph rendering shares this stage with edge rendering 
+    // (kEdgeEffectStage in GrContext) && SW path rendering 
+    // (kPathMaskStage in GrSWMaskHelper)
     kGlyphMaskStage = GrPaint::kTotalStages,
 };
 
 void GrTextContext::flushGlyphs() {
     if (NULL == fDrawTarget) {
         return;
     }
     GrDrawState* drawState = fDrawTarget->drawState();
     if (fCurrVertex > 0) {
         // setup our sampler state for our text texture/atlas
@@ skipping 209 matching lines @@
                                         SkFixedToFloat(vx + width),
                                         SkFixedToFloat(vy + height),
                                         2 * sizeof(SkPoint));
     fVertices[2*fCurrVertex+1].setRectFan(SkFixedToFloat(texture->normalizeFixedX(tx)),
                                           SkFixedToFloat(texture->normalizeFixedY(ty)),
                                           SkFixedToFloat(texture->normalizeFixedX(tx + width)),
                                           SkFixedToFloat(texture->normalizeFixedY(ty + height)),
                                           2 * sizeof(SkPoint));
     fCurrVertex += 4;
 }