Extract gpu line dashing to GrDashLinePathRenderer

Move line dashing logic from GrContext::drawPath to
GrDashLinePathRenderer. This makes it possible to let path renderers render arbitrary dashed paths.

End goal is to implement dashing in GrStencilAndCoverPathRenderer.

Review URL: https://codereview.chromium.org/1100073003

1 files changed, 46 insertions, 0 deletions

diff --git a/src/gpu/GrDashLinePathRenderer.h b/src/gpu/GrDashLinePathRenderer.h
new file mode 100644
index 0000000000..632f30a898
--- /dev/null
+++ b/src/gpu/GrDashLinePathRenderer.h
@@ -0,0 +1,46 @@
+
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrDashLinePathRenderer_DEFINED
+#define GrDashLinePathRenderer_DEFINED
+
+#include "GrPathRenderer.h"
+
+class GrDashLinePathRenderer : public GrPathRenderer {
+public:
+    GrDashLinePathRenderer(GrContext*);
+    ~GrDashLinePathRenderer();
+
+    bool canDrawPath(const GrDrawTarget*,
+                     const GrPipelineBuilder*,
+                     const SkMatrix& viewMatrix,
+                     const SkPath&,
+                     const GrStrokeInfo&,
+                     bool antiAlias) const override;
+
+protected:
+    StencilSupport onGetStencilSupport(const GrDrawTarget*,
+                                       const GrPipelineBuilder*,
+                                       const SkPath&,
+                                       const GrStrokeInfo&) const override {
+      return kNoSupport_StencilSupport;
+    }
+
+    bool onDrawPath(GrDrawTarget*,
+                    GrPipelineBuilder*,
+                    GrColor,
+                    const SkMatrix& viewMatrix,
+                    const SkPath&,
+                    const GrStrokeInfo&,
+                    bool antiAlias) override;
+    SkAutoTUnref<GrGpu> fGpu;
+    typedef GrPathRenderer INHERITED;
+};
+
+
+#endif