Improve quality of distance field rendering

src/gpu/GrAADistanceFieldPathRenderer.cpp

 
 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrAADistanceFieldPathRenderer.h"
 
@@ skipping 19 matching lines @@
 SK_CONF_DECLARE(bool, c_DumpPathCache, "gpu.dumpPathCache", false,
                 "Dump the contents of the path cache before every purge.");
 
 #ifdef DF_PATH_TRACKING
 static int g_NumCachedPaths = 0;
 static int g_NumFreedPaths = 0;
 #endif
 
 // mip levels
 static const int kSmallMIP = 32;
-static const int kMediumMIP = 64;
-static const int kLargeMIP = 128;
+static const int kMediumMIP = 78;
+static const int kLargeMIP = 192;
 
 ////////////////////////////////////////////////////////////////////////////////
 GrAADistanceFieldPathRenderer::GrAADistanceFieldPathRenderer(GrContext* context)
     : fContext(context)
     , fAtlas(NULL)
     , fEffectFlags(kInvalid_DistanceFieldEffectFlag) {
 }
 
 GrAADistanceFieldPathRenderer::~GrAADistanceFieldPathRenderer() {
     PathDataList::Iter iter;
@@ skipping 322 matching lines @@
     drawState->setGeometryProcessor(fCachedGeometryProcessor.get());
 
     vm.mapRect(&r);
     target->setIndexSourceToBuffer(fContext->getQuadIndexBuffer());
     target->drawIndexedInstances(kTriangles_GrPrimitiveType, 1, 4, 6, &r);
     target->resetVertexSource();
     
     return true;
 }