Add GrEllipseEdgeEffect

src/gpu/GrSWMaskHelper.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 "GrSWMaskHelper.h"
 #include "GrDrawState.h"
 #include "GrGpu.h"
@@ skipping 175 matching lines @@
                                               GrDrawTarget* target,
                                               const GrIRect& rect) {
     GrDrawState* drawState = target->drawState();
 
     GrDrawState::AutoDeviceCoordDraw adcd(drawState);
     if (!adcd.succeeded()) {
         return;
     }
     enum {
         // the SW path renderer shares this stage with glyph
-        // rendering (kGlyphMaskStage in GrBatchedTextContext)
+        // rendering (kGlyphMaskStage in GrTextContext)
+        // && edge rendering (kEdgeEffectStage in GrContext)
         kPathMaskStage = GrPaint::kTotalStages,
     };
     GrAssert(!drawState->isStageEnabled(kPathMaskStage));
     drawState->createTextureEffect(kPathMaskStage, texture, SkMatrix::I());
     SkScalar w = SkIntToScalar(rect.width());
     SkScalar h = SkIntToScalar(rect.height());
     GrRect maskRect = GrRect::MakeWH(w / texture->width(),
                                      h / texture->height());
 
     GrRect dstRect = GrRect::MakeLTRB(
                             SK_Scalar1 * rect.fLeft,
                             SK_Scalar1 * rect.fTop,
                             SK_Scalar1 * rect.fRight,
                             SK_Scalar1 * rect.fBottom);
     target->drawRect(dstRect, NULL, &maskRect, NULL, kPathMaskStage);
     drawState->disableStage(kPathMaskStage);
 }