Add a GrPathRange class

src/gpu/gl/GrGLPathRange.h

+
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrGLPathRange_DEFINED
+#define GrGLPathRange_DEFINED
+
+#include "../GrPathRange.h"
+#include "gl/GrGLFunctions.h"
+
+class GrGpuGL;
+
+/**
+ * Currently this represents a range of GL_NV_path_rendering Path IDs. If we
+ * support other GL path extensions then this would have to have a type enum
+ * and/or be subclassed.
+ */
+
+class GrGLPathRange : public GrPathRange {
+public:
+    GrGLPathRange(GrGpu*, size_t size, const SkStrokeRec&);
+    virtual ~GrGLPathRange();
+
+    GrGLuint basePathID() const { return fBasePathID; }
+
+    virtual void initAt(size_t index, const SkPath&);
+
+    // TODO: Use a better approximation for the individual path sizes.
+    virtual size_t gpuMemorySize() const SK_OVERRIDE {
+        return 100 * fNumDefinedPaths;
+    }
+
+protected:
+    virtual void onRelease() SK_OVERRIDE;
+    virtual void onAbandon() SK_OVERRIDE;
+
+private:
+    GrGLuint fBasePathID;
+    size_t fNumDefinedPaths;
+
+    typedef GrPathRange INHERITED;
+};
+
+#endif