Consolidate GPU buffer implementations

src/gpu/GrIndexBuffer.h

-
-/*
- * Copyright 2010 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-
-
-#ifndef GrIndexBuffer_DEFINED
-#define GrIndexBuffer_DEFINED
-
-#include "GrGeometryBuffer.h"
-
-
-class GrIndexBuffer : public GrGeometryBuffer {
-public:
-    static void ComputeScratchKey(size_t size, bool dynamic, GrScratchKey* key) {
-        static const GrScratchKey::ResourceType kType = GrScratchKey::GenerateResourceType();
-
-        GrScratchKey::Builder builder(key, kType, 2);
-
-        builder[0] = SkToUInt(size);
-        builder[1] = dynamic ? 1 : 0;
-    }
-
-    /**
-     * Retrieves the maximum number of quads that could be rendered
-     * from the index buffer (using kTriangles_GrPrimitiveType).
-     * @return the maximum number of quads using full size of index buffer.
-     */
-    int maxQuads() const {
-        return static_cast<int>(this->gpuMemorySize() / (sizeof(uint16_t) * 6));
-    }
-protected:
-    GrIndexBuffer(GrGpu* gpu, size_t gpuMemorySize, bool dynamic, bool cpuBacked)
-        : INHERITED(gpu, gpuMemorySize, dynamic, cpuBacked) {
-        // We currently only make buffers scratch if they're both pow2 sized and not cpuBacked.
-        if (!cpuBacked && SkIsPow2(gpuMemorySize)) {
-            GrScratchKey key;
-            ComputeScratchKey(gpuMemorySize, dynamic, &key);
-            this->setScratchKey(key);
-        }
-    }
-
-private:
-    typedef GrGeometryBuffer INHERITED;
-};
-
-#endif