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
hasPendingRead()36 bool hasPendingRead() const { return fSurface->hasPendingRead(); }
hasPendingWrite()37 bool hasPendingWrite() const { return fSurface->hasPendingWrite(); }
hasPendingIO()38 bool hasPendingIO() const { return fSurface->hasPendingIO(); }
39
40 private:
GrSurfacePriv(GrSurface * surface)41 explicit GrSurfacePriv(GrSurface* surface) : fSurface(surface) {}
42 GrSurfacePriv(const GrSurfacePriv&); // unimpl
43 GrSurfacePriv& operator=(const GrSurfacePriv&); // unimpl
44
45 // No taking addresses of this type.
46 const GrSurfacePriv* operator&() const;
47 GrSurfacePriv* operator&();
48
49 GrSurface* fSurface;
50
51 friend class GrSurface; // to construct/copy this type.
52 };
53
surfacePriv()54 inline GrSurfacePriv GrSurface::surfacePriv() { return GrSurfacePriv(this); }
55
surfacePriv()56 inline const GrSurfacePriv GrSurface::surfacePriv() const {
57 return GrSurfacePriv(const_cast<GrSurface*>(this));
58 }
59
60 #endif
61