Implement stroking a path with nv_path_rendering

Initialize the path stroke properties in the GrGLPath constructor.
Use StencilStrokePath and CoverStrokePath to stroke the path.

The order of the GL calls is:
1. StencilFill, if needed
2. StencilStroke, if needed
2a. CoverStroke, if stroke was applied
2b. CoverFill, if stroke was not applied

The reason for not pairing StencilFill + CoverFill, StencilStroke +
CoverStroke is that Skia API does not allow separate fill and stroke
color within one call. Covering the stroke bounding box should also
cover the fill bounding box.

Causes different rendering in gm/dashcubics due to different rendering
algorithm. (?) (TODO: this should be resolved somehow.)

R=bsalomon@google.com, markkilgard@gmail.com, cdalton@nvidia.com

Author: kkinnunen@nvidia.com

Review URL: https://codereview.chromium.org/23440049

git-svn-id: http://skia.googlecode.com/svn/trunk@11672 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 8 insertions, 1 deletions

diff --git a/src/gpu/GrPath.h b/src/gpu/GrPath.h
index c7e7f92064..37dc9591a6 100644
--- a/src/gpu/GrPath.h
+++ b/src/gpu/GrPath.h
@@ -10,17 +10,24 @@
 
 #include "GrResource.h"
 #include "SkRect.h"
+#include "SkStrokeRec.h"
 
 class GrPath : public GrResource {
 public:
     SK_DECLARE_INST_COUNT(GrPath);
 
-    GrPath(GrGpu* gpu, bool isWrapped) : INHERITED(gpu, isWrapped) {}
+    GrPath(GrGpu* gpu, bool isWrapped, const SkStrokeRec& stroke)
+        : INHERITED(gpu, isWrapped),
+          fStroke(stroke) {
+    }
 
     const SkRect& getBounds() const { return fBounds; }
 
+    const SkStrokeRec& getStroke() const { return fStroke; }
+
 protected:
     SkRect fBounds;
+    SkStrokeRec fStroke;
 
 private:
     typedef GrResource INHERITED;