Make "priv" classes for GrTexure and GrSurface.

src/gpu/GrSurfacePriv.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 GrSurfacePriv_DEFINED
+#define GrSurfacePriv_DEFINED
+
+#include "GrSurface.h"
+
+/** Class that adds methods to GrSurface that are only intended for use internal to Skia.
+    This class is purely a privileged window into GrSurface. It should never have additional data
+    members or virtual methods.
+    Non-static methods that are not trivial inlines should be spring-boarded (e.g. declared and
+    implemented privately in GrSurface with a inline public method here). */
+class GrSurfacePriv {
+public:
+    /**
+     * Derive a SkImageInfo from the surface's descriptor. This is lossy as ImageInfo has fields not
+     * known to GrSurface (e.g. alphaType).
+     */
+    SkImageInfo info() const { return fSurface->info(); }
+
+    /**
+     * Checks whether this GrSurface refers to the same GPU object as other. This
+     * catches the case where a GrTexture and GrRenderTarget refer to the same
+     * GPU memory.
+     */
+    bool isSameAs(const GrSurface* other) const { return fSurface->isSameAs(other); }
+
+    /**
+     * Write the contents of the surface to a PNG. Returns true if successful.
+     * @param filename      Full path to desired file
+     */
+    bool savePixels(const char* filename) { return fSurface->savePixels(filename); }
+
+    bool hasPendingRead() const { return fSurface->hasPendingRead(); }
+    bool hasPendingWrite() const { return fSurface->hasPendingWrite(); }
+    bool hasPendingIO() const { return fSurface->hasPendingIO(); }
+
+private:
+    GrSurfacePriv(GrSurface* surface) : fSurface(surface) { }
+    GrSurfacePriv(const GrSurfacePriv& that) : fSurface(that.fSurface) { }
+    GrSurfacePriv& operator=(const GrSurface&); // unimpl
+
+    // No taking addresses of this type.
+    const GrSurfacePriv* operator&() const;
+    GrSurfacePriv* operator&();
+
+    GrSurface* fSurface;
+
+    friend class GrSurface; // to construct/copy this type.
+};
+
+inline GrSurfacePriv GrSurface::surfacePriv() { return GrSurfacePriv(this); }
+
+inline const GrSurfacePriv GrSurface::surfacePriv() const {
+    return GrSurfacePriv(const_cast<GrSurface*>(this));
+}
+
+#endif