Make SkOSWindow return the sample count and stencil bit count for its GL context.

samplecode/SampleApp.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 "SampleApp.h"
 
 #include "SkData.h"
 #include "SkCanvas.h"
@@ skipping 170 matching lines @@
 #if SK_ANGLE
             case kANGLE_DeviceType:
                 // ANGLE is really the only odd man out
                 fBackend = kANGLE_BackEndType;
                 break;
 #endif // SK_ANGLE
             default:
                 SkASSERT(false);
                 break;
         }
-
-        bool result = win->attach(fBackend, msaaSampleCount);
+        AttachmentInfo attachmentInfo;
+        bool result = win->attach(fBackend, msaaSampleCount, &attachmentInfo);
         if (!result) {
             SkDebugf("Failed to initialize GL");
             return;
         }
         fMSAASampleCount = msaaSampleCount;
 
         SkASSERT(NULL == fCurIntf);
         switch (win->getDeviceType()) {
             case kRaster_DeviceType:
                 // fallthrough
@@ skipping 79 matching lines @@
             }
         }
 #endif
 
         win->present();
     }
 
     virtual void windowSizeChanged(SampleWindow* win) {
 #if SK_SUPPORT_GPU
         if (fCurContext) {
-            win->attach(fBackend, fMSAASampleCount);
+            AttachmentInfo attachmentInfo;
+            win->attach(fBackend, fMSAASampleCount, &attachmentInfo);
 
             GrBackendRenderTargetDesc desc;
             desc.fWidth = SkScalarRound(win->width());
             desc.fHeight = SkScalarRound(win->height());
             desc.fConfig = kSkia8888_GrPixelConfig;
             desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
-            GR_GL_GetIntegerv(fCurIntf, GR_GL_SAMPLES, &desc.fSampleCnt);
-            GR_GL_GetIntegerv(fCurIntf, GR_GL_STENCIL_BITS, &desc.fStencilBits);
+            desc.fSampleCnt = attachmentInfo.fSampleCount;
+            desc.fStencilBits = attachmentInfo.fStencilBits;
             GrGLint buffer;
             GR_GL_GetIntegerv(fCurIntf, GR_GL_FRAMEBUFFER_BINDING, &buffer);
             desc.fRenderTargetHandle = buffer;
 
             SkSafeUnref(fCurRenderTarget);
             fCurRenderTarget = fCurContext->wrapBackendRenderTarget(desc);
         }
 #endif
     }
 
@@ skipping 2140 matching lines @@
     SkGraphics::Init();
     SkEvent::Init();
 }
 
 // FIXME: this should be in a header
 void application_term();
 void application_term() {
     SkEvent::Term();
     SkGraphics::Term();
 }