Add flag for window rectangles to GrRenderTarget

src/gpu/gl/GrGLRenderTarget.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLRenderTarget.h"
 
 #include "GrGLGpu.h"
 #include "GrGLUtil.h"
 #include "GrGpuResourcePriv.h"
 #include "GrRenderTargetPriv.h"
 #include "SkTraceMemoryDump.h"
 
 #define GPUGL static_cast<GrGLGpu*>(this->getGpu())
 #define GL_CALL(X) GR_GL_CALL(GPUGL->glInterface(), X)
 
 // Because this class is virtually derived from GrSurface we must explicitly call its constructor.
 // Constructor for wrapped render targets.
 GrGLRenderTarget::GrGLRenderTarget(GrGLGpu* gpu,
                                    const GrSurfaceDesc& desc,
                                    const IDDesc& idDesc,
                                    GrGLStencilAttachment* stencil)
     : GrSurface(gpu, desc)
-    , INHERITED(gpu, desc, idDesc.fSampleConfig, stencil) {
+    , INHERITED(gpu, desc, ComputeFlags(gpu->glCaps(), idDesc), stencil) {
     this->init(desc, idDesc);
     this->registerWithCacheWrapped();
 }
 
 GrGLRenderTarget::GrGLRenderTarget(GrGLGpu* gpu, const GrSurfaceDesc& desc,
                                    const IDDesc& idDesc)
     : GrSurface(gpu, desc)
-    , INHERITED(gpu, desc, idDesc.fSampleConfig) {
+    , INHERITED(gpu, desc, ComputeFlags(gpu->glCaps(), idDesc)) {
     this->init(desc, idDesc);
 }
 
+inline GrRenderTarget::Flags GrGLRenderTarget::ComputeFlags(const GrGLCaps& glCaps,
+                                                            const IDDesc& idDesc) {
+    Flags flags = Flags::kNone;
+    if (idDesc.fIsMixedSampled) {
+        SkASSERT(glCaps.usesMixedSamples() && idDesc.fRTFBOID); // FBO 0 can't be mixed sampled.
+        flags |= Flags::kMixedSampled;
+    }
+    if (glCaps.maxWindowRectangles() > 0 && idDesc.fRTFBOID) {
+        flags |= Flags::kWindowRectsSupport;
+    }
+    return flags;
+}
+
 void GrGLRenderTarget::init(const GrSurfaceDesc& desc, const IDDesc& idDesc) {
     fRTFBOID                = idDesc.fRTFBOID;
     fTexFBOID               = idDesc.fTexFBOID;
     fMSColorRenderbufferID  = idDesc.fMSColorRenderbufferID;
     fRTFBOOwnership         = idDesc.fRTFBOOwnership;
 
     fViewport.fLeft   = 0;
     fViewport.fBottom = 0;
     fViewport.fWidth  = desc.fWidth;
     fViewport.fHeight = desc.fHeight;
@@ skipping 169 matching lines @@
 int GrGLRenderTarget::totalSamples() const {
   int total_samples = this->msaaSamples();
 
   if (fTexFBOID != kUnresolvableFBOID) {
       // If we own the resolve buffer then that is one more sample per pixel.
       total_samples += 1;
   }
 
   return total_samples;
 }