Add convex polygon rendering effect and GM to test it.

gm/beziereffects.cpp

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This test only works with the GPU backend.
 
 #include "gm.h"
 
 #if SK_SUPPORT_GPU
 
 #include "GrContext.h"
 #include "GrPathUtils.h"
 #include "GrTest.h"
 #include "SkColorPriv.h"
 #include "SkDevice.h"
 #include "SkGeometry.h"
 
 #include "effects/GrBezierEffect.h"
 
 // Position & KLM line eq values. These are the vertex attributes for Bezier curves. The last value
 // of the Vec4f is ignored.
-extern const GrVertexAttrib kAttribs[] = {
+static const GrVertexAttrib kAttribs[] = {

[bsalomon, 2014/01/29 20:18:30]

I think this will break some compilers because it is used as a template arg. Try
runs will find out...

[robertphillips, 2014/01/29 20:57:55]

Yep - I seem to recall the extern was required.

     {kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding},
     {kVec4f_GrVertexAttribType, sizeof(GrPoint), kEffect_GrVertexAttribBinding}
 };
 
 static inline SkScalar eval_line(const SkPoint& p, const SkScalar lineEq[3], SkScalar sign) {
     return sign * (lineEq[0] * p.fX + lineEq[1] * p.fY + lineEq[2]);
 }
 
 namespace skiagm {
 /**
@@ skipping 472 matching lines @@
     typedef GM INHERITED;
 };
 
 DEF_GM( return SkNEW(BezierCubicEffects); )
 DEF_GM( return SkNEW(BezierConicEffects); )
 DEF_GM( return SkNEW(BezierQuadEffects); )
 
 }
 
 #endif