Only assert that conic/quad effects get created if they are to be used.

src/gpu/GrAAHairLinePathRenderer.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrAAHairLinePathRenderer.h"
 
 #include "GrContext.h"
@@ skipping 938 matching lines @@
         // perspective.
         if (target->getDrawState().getViewMatrix().hasPerspective()) {
             asr.set(target, GrDrawTarget::kPreserve_ASRInit);
         } else if (!asr.setIdentity(target, GrDrawTarget::kPreserve_ASRInit)) {
             return false;
         }
         GrDrawState* drawState = target->drawState();
 
         static const int kEdgeAttrIndex = 1;
 
-        GrEffectRef* hairQuadEffect = GrQuadEffect::Create(kHairAA_GrBezierEdgeType,
-                                                           *target->caps());
-        GrEffectRef* hairConicEffect = GrConicEffect::Create(kHairAA_GrBezierEdgeType,
-                                                             *target->caps());
-        SkASSERT(hairQuadEffect && hairConicEffect);
-
         // Check devBounds
         SkASSERT(check_bounds<BezierVertex>(drawState, devBounds, arg.vertices(),
                                             kVertsPerQuad * quadCnt + kVertsPerQuad * conicCnt));
 
-        {
+        if (quadCnt > 0) {
+            GrEffectRef* hairQuadEffect = GrQuadEffect::Create(kHairAA_GrBezierEdgeType,
+                                                               *target->caps());
+            SkASSERT(NULL != hairQuadEffect);
             GrDrawState::AutoRestoreEffects are(drawState);
             target->setIndexSourceToBuffer(fQuadsIndexBuffer);
+            drawState->addCoverageEffect(hairQuadEffect, kEdgeAttrIndex)->unref();
             int quads = 0;
-            drawState->addCoverageEffect(hairQuadEffect, kEdgeAttrIndex)->unref();
             while (quads < quadCnt) {
                 int n = GrMin(quadCnt - quads, kNumQuadsInIdxBuffer);
                 target->drawIndexed(kTriangles_GrPrimitiveType,
                                     kVertsPerQuad*quads,               // startV
                                     0,                                 // startI
                                     kVertsPerQuad*n,                   // vCount
                                     kIdxsPerQuad*n,                    // iCount
                                     &devBounds);
                 quads += n;
             }
         }
 
-        {
+        if (conicCnt > 0) {
             GrDrawState::AutoRestoreEffects are(drawState);
+            GrEffectRef* hairConicEffect = GrConicEffect::Create(kHairAA_GrBezierEdgeType,
+                                                                 *target->caps());
+            SkASSERT(NULL != hairConicEffect);
+            drawState->addCoverageEffect(hairConicEffect, 1, 2)->unref();
             int conics = 0;
-            drawState->addCoverageEffect(hairConicEffect, 1, 2)->unref();
             while (conics < conicCnt) {
                 int n = GrMin(conicCnt - conics, kNumQuadsInIdxBuffer);
                 target->drawIndexed(kTriangles_GrPrimitiveType,
                                     kVertsPerQuad*(quadCnt + conics),  // startV
                                     0,                                 // startI
                                     kVertsPerQuad*n,                   // vCount
                                     kIdxsPerQuad*n,                    // iCount
                                     &devBounds);
                 conics += n;
             }
         }
     }
 
     target->resetIndexSource();
 
     return true;
 }