debugger: Abandon context when Qt changes it without notice

debugger/QT/SkGLWidget.cpp

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkGLWidget.h"
@@ skipping 14 matching lines @@
     setFormat(currentFormat);
 }
 
 void SkGLWidget::initializeGL() {
     if (!fCurIntf) {
         fCurIntf.reset(GrGLCreateNativeInterface());
     }
     if (!fCurIntf) {
         return;
     }
-    if (!fCurContext) {
-        fCurContext.reset(GrContext::Create(kOpenGL_GrBackend, (GrBackendContext) fCurIntf.get()));
-    }
-    if (!fCurContext) {
-        return;
-    }
-
     // The call may come multiple times, for example after setSampleCount().  The QGLContext will be
     // different, but we do not have a mechanism to catch the destroying of QGLContext, so that
-    // proper resource cleanup could be made. Instead, we assume that the underlying GL context
-    // never actually changes. If it would, we could not destroy the resources.
+    // proper resource cleanup could be made.
+    if (fCurContext) {
+        fCurContext->abandonContext();
+    }
     fGpuDevice.reset(NULL);
     fCanvas.reset(NULL);
+
+    fCurContext.reset(GrContext::Create(kOpenGL_GrBackend, (GrBackendContext) fCurIntf.get()));
 }
 
 void SkGLWidget::createRenderTarget() {
     if (!fCurContext) {
         return;
     }
 
     glDisable(GL_SCISSOR_TEST);
     glStencilMask(0xffffffff);
     glClearStencil(0);
@@ skipping 11 matching lines @@
     fCanvas.reset(new SkCanvas(fGpuDevice));
 }
 
 void SkGLWidget::resizeGL(int w, int h) {
     SkASSERT(w == this->width() && h == this->height());
     this->createRenderTarget();
 }
 
 void SkGLWidget::paintGL() {
     if (!this->isHidden() && fCanvas) {
+        fCurContext->resetContext();
         fDebugger->draw(fCanvas.get());
         // TODO(chudy): Implement an optional flush button in Gui.
         fCanvas->flush();
         emit drawComplete();
     }
 }
 
 GrBackendRenderTargetDesc SkGLWidget::getDesc(int w, int h) {
     GrBackendRenderTargetDesc desc;
     desc.fWidth = SkScalarRoundToInt(this->width());
     desc.fHeight = SkScalarRoundToInt(this->height());
     desc.fConfig = kSkia8888_GrPixelConfig;
     GR_GL_GetIntegerv(fCurIntf, GR_GL_SAMPLES, &desc.fSampleCnt);
     GR_GL_GetIntegerv(fCurIntf, GR_GL_STENCIL_BITS, &desc.fStencilBits);
     GrGLint buffer;
     GR_GL_GetIntegerv(fCurIntf, GR_GL_FRAMEBUFFER_BINDING, &buffer);
     desc.fRenderTargetHandle = buffer;
 
     return desc;
 }
 
 #endif