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      1 /*
      2  * Copyright 2016 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 GrRenderTargetProxy_DEFINED
      9 #define GrRenderTargetProxy_DEFINED
     10 
     11 #include "GrRenderTarget.h"
     12 #include "GrSurfaceProxy.h"
     13 #include "GrTypes.h"
     14 
     15 class GrResourceProvider;
     16 
     17 // This class delays the acquisition of RenderTargets until they are actually
     18 // required
     19 // Beware: the uniqueID of the RenderTargetProxy will usually be different than
     20 // the uniqueID of the RenderTarget it represents!
     21 class GrRenderTargetProxy : virtual public GrSurfaceProxy {
     22 public:
     23     GrRenderTargetProxy* asRenderTargetProxy() override { return this; }
     24     const GrRenderTargetProxy* asRenderTargetProxy() const override { return this; }
     25 
     26     // Actually instantiate the backing rendertarget, if necessary.
     27     GrRenderTarget* instantiate(GrResourceProvider* resourceProvider);
     28 
     29     bool isStencilBufferMultisampled() const { return fDesc.fSampleCnt > 0; }
     30 
     31     /**
     32      * For our purposes, "Mixed Sampled" means the stencil buffer is multisampled but the color
     33      * buffer is not.
     34      */
     35     bool isMixedSampled() const { return fRenderTargetFlags & GrRenderTarget::Flags::kMixedSampled; }
     36 
     37     /**
     38      * "Unified Sampled" means the stencil and color buffers are both multisampled.
     39      */
     40     bool isUnifiedMultisampled() const { return fDesc.fSampleCnt > 0 && !this->isMixedSampled(); }
     41 
     42     /**
     43      * Returns the number of samples/pixel in the stencil buffer (Zero if non-MSAA).
     44      */
     45     int numStencilSamples() const { return fDesc.fSampleCnt; }
     46 
     47     /**
     48      * Returns the number of samples/pixel in the color buffer (Zero if non-MSAA or mixed sampled).
     49      */
     50     int numColorSamples() const { return this->isMixedSampled() ? 0 : fDesc.fSampleCnt; }
     51 
     52     int maxWindowRectangles(const GrCaps& caps) const;
     53 
     54     GrRenderTarget::Flags testingOnly_getFlags() const;
     55 
     56     // TODO: move this to a priv class!
     57     bool refsWrappedObjects() const;
     58 
     59 protected:
     60     friend class GrSurfaceProxy;  // for ctors
     61 
     62     // Deferred version
     63     GrRenderTargetProxy(const GrCaps&, const GrSurfaceDesc&,
     64                         SkBackingFit, SkBudgeted, uint32_t flags);
     65 
     66     // Wrapped version
     67     GrRenderTargetProxy(sk_sp<GrSurface>);
     68 
     69 private:
     70     size_t onGpuMemorySize() const override;
     71 
     72     // For wrapped render targets the actual GrRenderTarget is stored in the GrIORefProxy class.
     73     // For deferred proxies that pointer is filled in when we need to instantiate the
     74     // deferred resource.
     75 
     76     // These don't usually get computed until the render target is instantiated, but the render
     77     // target proxy may need to answer queries about it before then. And since in the deferred case
     78     // we know the newly created render target will be internal, we are able to precompute what the
     79     // flags will ultimately end up being. In the wrapped case we just copy the wrapped
     80     // rendertarget's info here.
     81     GrRenderTarget::Flags   fRenderTargetFlags;
     82 
     83     typedef GrSurfaceProxy INHERITED;
     84 };
     85 
     86 #endif
     87