Improve NVPR stroke accuracy to fix thick strokes

src/gpu/gl/GrGLPath.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 "GrGLPath.h"
 #include "GrGLPathRendering.h"
@@ skipping 160 matching lines @@
     if (stroke.needToApply()) {
         SkASSERT(!stroke.isHairlineStyle());
         GR_GL_CALL(gpu->glInterface(),
             PathParameterf(pathID, GR_GL_PATH_STROKE_WIDTH, SkScalarToFloat(stroke.getWidth())));
         GR_GL_CALL(gpu->glInterface(),
             PathParameterf(pathID, GR_GL_PATH_MITER_LIMIT, SkScalarToFloat(stroke.getMiter())));
         GrGLenum join = join_to_gl_join(stroke.getJoin());
         GR_GL_CALL(gpu->glInterface(), PathParameteri(pathID, GR_GL_PATH_JOIN_STYLE, join));
         GrGLenum cap = cap_to_gl_cap(stroke.getCap());
         GR_GL_CALL(gpu->glInterface(), PathParameteri(pathID, GR_GL_PATH_END_CAPS, cap));
+        GR_GL_CALL(gpu->glInterface(), PathParameterf(pathID, GR_GL_PATH_STROKE_BOUND, 0.02f));
     }
 }
 
 GrGLPath::GrGLPath(GrGLGpu* gpu, const SkPath& path, const SkStrokeRec& stroke)
     : INHERITED(gpu, path, stroke),
       fPathID(gpu->glPathRendering()->genPaths(1)) {
 
     InitPathObject(gpu, fPathID, fSkPath, stroke);
 
     if (stroke.needToApply()) {
@@ skipping 10 matching lines @@
     }
 
     INHERITED::onRelease();
 }
 
 void GrGLPath::onAbandon() {
     fPathID = 0;
 
     INHERITED::onAbandon();
 }