Home | History | Annotate | Download | only in gpu 
      1 /*
      2  * Copyright 2012 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 
      9 #ifndef GrSurface_DEFINED
     10 #define GrSurface_DEFINED
     11 
     12 #include "GrTypes.h"
     13 #include "GrGpuResource.h"
     14 #include "SkImageInfo.h"
     15 #include "SkRect.h"
     16 
     17 class GrRenderTarget;
     18 class GrSurfacePriv;
     19 class GrTexture;
     20 
     21 class SK_API GrSurface : public GrGpuResource {
     22 public:
     23     /**
     24      * Retrieves the width of the surface.
     25      */
     26     int width() const { return fWidth; }
     27 
     28     /**
     29      * Retrieves the height of the surface.
     30      */
     31     int height() const { return fHeight; }
     32 
     33     /**
     34      * Helper that gets the width and height of the surface as a bounding rectangle.
     35      */
     36     SkRect getBoundsRect() const { return SkRect::MakeIWH(this->width(), this->height()); }
     37 
     38     /**
     39      * Retrieves the pixel config specified when the surface was created.
     40      * For render targets this can be kUnknown_GrPixelConfig
     41      * if client asked us to render to a target that has a pixel
     42      * config that isn't equivalent with one of our configs.
     43      */
     44     GrPixelConfig config() const { return fConfig; }
     45 
     46     /**
     47      * @return the texture associated with the surface, may be null.
     48      */
     49     virtual GrTexture* asTexture() { return nullptr; }
     50     virtual const GrTexture* asTexture() const { return nullptr; }
     51 
     52     /**
     53      * @return the render target underlying this surface, may be null.
     54      */
     55     virtual GrRenderTarget* asRenderTarget() { return nullptr; }
     56     virtual const GrRenderTarget* asRenderTarget() const { return nullptr; }
     57 
     58     /** Access methods that are only to be used within Skia code. */
     59     inline GrSurfacePriv surfacePriv();
     60     inline const GrSurfacePriv surfacePriv() const;
     61 
     62     static size_t WorstCaseSize(const GrSurfaceDesc& desc, bool useNextPow2 = false);
     63     static size_t ComputeSize(GrPixelConfig config, int width, int height, int colorSamplesPerPixel,
     64                               GrMipMapped, bool useNextPow2 = false);
     65 
     66 protected:
     67     // Methods made available via GrSurfacePriv
     68     bool hasPendingRead() const;
     69     bool hasPendingWrite() const;
     70     bool hasPendingIO() const;
     71 
     72     // Provides access to methods that should be public within Skia code.
     73     friend class GrSurfacePriv;
     74 
     75     GrSurface(GrGpu* gpu, const GrSurfaceDesc& desc)
     76             : INHERITED(gpu)
     77             , fConfig(desc.fConfig)
     78             , fWidth(desc.fWidth)
     79             , fHeight(desc.fHeight) {}
     80     ~GrSurface() override {}
     81 
     82 
     83     void onRelease() override;
     84     void onAbandon() override;
     85 
     86 private:
     87     GrPixelConfig        fConfig;
     88     int                  fWidth;
     89     int                  fHeight;
     90 
     91     typedef GrGpuResource INHERITED;
     92 };
     93 
     94 #endif
     95