1 /*
2  * Copyright 2014 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #ifndef GrSurfacePriv_DEFINED
9 #define GrSurfacePriv_DEFINED
10 
11 #include "GrSurface.h"
12 
13 /** Class that adds methods to GrSurface that are only intended for use internal to Skia.
14     This class is purely a privileged window into GrSurface. It should never have additional data
15     members or virtual methods.
16     Non-static methods that are not trivial inlines should be spring-boarded (e.g. declared and
17     implemented privately in GrSurface with a inline public method here). */
18 class GrSurfacePriv {
19 public:
20     /** Helpers used in read/write pixels implementations. The parameters are adjusted so that the
21         read/write respects the bounds of a surface. If the input *rowBytes is 0 it will be
22         the tight row bytes (based on width and bpp) on output. */
23     static bool AdjustReadPixelParams(int surfaceWidth,
24                                       int surfaceHeight,
25                                       size_t bpp,
26                                       int* left, int* top, int* width, int* height,
27                                       void** data,
28                                       size_t* rowBytes);
29     static bool AdjustWritePixelParams(int surfaceWidth,
30                                       int surfaceHeight,
31                                       size_t bpp,
32                                       int* left, int* top, int* width, int* height,
33                                       const void** data,
34                                       size_t* rowBytes);
35 
36     bool hasPendingRead() const { return fSurface->hasPendingRead(); }
37     bool hasPendingWrite() const { return fSurface->hasPendingWrite(); }
38     bool hasPendingIO() const { return fSurface->hasPendingIO(); }
39     bool hasUniqueRef() const { return fSurface->internalHasUniqueRef(); }
40 
41 private:
42     explicit GrSurfacePriv(GrSurface* surface) : fSurface(surface) {}
43     GrSurfacePriv(const GrSurfacePriv&); // unimpl
44     GrSurfacePriv& operator=(const GrSurfacePriv&); // unimpl
45 
46     // No taking addresses of this type.
47     const GrSurfacePriv* operator&() const;
48     GrSurfacePriv* operator&();
49 
50     GrSurface* fSurface;
51 
52     friend class GrSurface; // to construct/copy this type.
53 };
54 
55 inline GrSurfacePriv GrSurface::surfacePriv() { return GrSurfacePriv(this); }
56 
57 inline const GrSurfacePriv GrSurface::surfacePriv() const {
58     return GrSurfacePriv(const_cast<GrSurface*>(this));
59 }
60 
61 #endif
62