Line data    Source code

       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 paramters 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           0 :     bool hasPendingWrite() const { return fSurface->hasPendingWrite(); }
      38           0 :     bool hasPendingIO() const { return fSurface->hasPendingIO(); }
      39             : 
      40             : private:
      41           0 :     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             : 
      54           0 : inline GrSurfacePriv GrSurface::surfacePriv() { return GrSurfacePriv(this); }
      55             : 
      56             : inline const GrSurfacePriv GrSurface::surfacePriv() const {
      57             :     return GrSurfacePriv(const_cast<GrSurface*>(this));
      58             : }
      59             : 
      60             : #endif