Add Gr*Proxy classes

include/gpu/GrSurfaceProxy.h

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrSurfaceProxy_DEFINED
+#define GrSurfaceProxy_DEFINED
+
+#include "GrGpuResource.h"
+
+class GrTextureProxy;
+class GrRenderTargetProxy;
+
+class GrSurfaceProxy : public GrIORef<GrSurfaceProxy> {
+public:
+    enum BackingFit {

[bsalomon, 2016/05/02 17:45:40]

Wondering if it would make sense to elevate the Loose/Tight enum you already
make in SkSpecialSurface.

[robertphillips, 2016/05/02 19:22:54]

Done.

+        kExact_BackingFit,
+        kApprox_BackingFit
+    };
+
+    const GrSurfaceDesc& desc() const { return fDesc; }
+
+    GrSurfaceOrigin origin() const {
+        SkASSERT(kTopLeft_GrSurfaceOrigin == fDesc.fOrigin ||
+                 kBottomLeft_GrSurfaceOrigin == fDesc.fOrigin);
+        return fDesc.fOrigin;
+    }
+    int width() const { return fDesc.fWidth; }
+    int height() const { return fDesc.fWidth; }
+    GrPixelConfig config() const { return fDesc.fConfig; }
+
+    uint32_t uniqueID() const { return fUniqueID; }
+
+    /**
+     * @return the texture proxy associated with the surface proxy, may be NULL.
+     */
+    virtual GrTextureProxy* asTextureProxy() { return nullptr; }
+    virtual const GrTextureProxy* asTextureProxy() const { return nullptr; }
+
+    /**
+     * @return the render target proxy associated with the surface proxy, may be NULL.
+     */
+    virtual GrRenderTargetProxy* asRenderTargetProxy() { return nullptr; }
+    virtual const GrRenderTargetProxy* asRenderTargetProxy() const { return nullptr; }
+
+protected:
+    GrSurfaceProxy(const GrSurfaceDesc& desc, BackingFit fit, SkBudgeted budgeted)
+        : fDesc(desc)
+        , fFit(fit)
+        , fBudgeted(budgeted)
+        , fUniqueID(CreateUniqueID()) {
+    }
+
+    virtual ~GrSurfaceProxy() {}
+
+    // For wrapped resources, 'fDesc' will always be filled in from the wrapped resource.
+    const GrSurfaceDesc fDesc;
+    const BackingFit    fFit;      // always exact for wrapped resources
+    const SkBudgeted    fBudgeted; // set from the backing resource for wrapped resources
+    const uint32_t      fUniqueID;
+
+private:
+    static uint32_t CreateUniqueID();
+
+    // See comment in GrGpuResource.h.
+    void notifyAllCntsAreZero(CntType) const {}
+    bool notifyRefCountIsZero() const { return false; }
+
+    typedef GrIORef<GrSurfaceProxy> INHERITED;
+
+    // to access notifyAllCntsAreZero and notifyRefCntIsZero.
+    friend class GrIORef<GrSurfaceProxy>;
+};
+
+#endif