Merge remote-tracking branch 'origin/4.7' into qt-master-from-4.7

Conflicts:
	src/opengl/qwindowsurface_gl.cpp

1 files changed, 24 insertions, 7 deletions

diff --git a/src/opengl/qwindowsurface_gl.cpp b/src/opengl/qwindowsurface_gl.cpp
index 2ccbc50..eae1c9b 100644
--- a/src/opengl/qwindowsurface_gl.cpp
+++ b/src/opengl/qwindowsurface_gl.cpp
@@ -493,6 +493,14 @@ void QGLWindowSurface::hijackWindow(QWidget *widget)
     }
     bool swapBehaviourPreserved = (ctx->d_func()->eglContext->configAttrib(EGL_SWAP_BEHAVIOR) != EGL_BUFFER_PRESERVED)
         || (ctx->d_func()->eglContext->configAttrib(EGL_SURFACE_TYPE)&EGL_SWAP_BEHAVIOR_PRESERVED_BIT);
+    if (ctx->d_func()->eglContext->configAttrib(EGL_SURFACE_TYPE)&EGL_SWAP_BEHAVIOR_PRESERVED_BIT) {
+        EGLint swapBehavior;
+        if (eglQuerySurface(ctx->d_func()->eglContext->display(), ctx->d_func()->eglSurface
+                            , EGL_SWAP_BEHAVIOR, &swapBehavior)) {
+            swapBehaviourPreserved = (swapBehavior == EGL_BUFFER_PRESERVED);
+        }
+    }
+
     if (!swapBehaviourPreserved && !haveNOKSwapRegion)
         d_ptr->partialUpdateSupport = false; // Force full-screen updates
     else
@@ -541,6 +549,7 @@ static void drawTexture(const QRectF &rect, GLuint tex_id, const QSize &texSize,
 void QGLWindowSurface::beginPaint(const QRegion &)
 {
     d_ptr->did_paint = true;
+    updateGeometry();
 
     if (!context())
         return;
@@ -912,14 +921,22 @@ void QGLWindowSurface::updateGeometry() {
         ctx->d_func()->eglSurface = QEgl::createSurface(ctx->device(),
                                            ctx->d_func()->eglContext->config());
 
-#if !defined(QGL_NO_PRESERVED_SWAP)
-        eglGetError();  // Clear error state first.
-        eglSurfaceAttrib(QEgl::display(), ctx->d_func()->eglSurface,
-                                    EGL_SWAP_BEHAVIOR, EGL_BUFFER_PRESERVED);
-        if (eglGetError() != EGL_SUCCESS) {
-            qWarning("QGLWindowSurface: could not restore preserved swap behaviour");
+        eglGetError();  // Clear error state.
+        if (hasPartialUpdateSupport()) {
+            eglSurfaceAttrib(ctx->d_func()->eglContext->display(),
+                                            ctx->d_func()->eglSurface,
+                                            EGL_SWAP_BEHAVIOR, EGL_BUFFER_PRESERVED);
+
+            if (eglGetError() != EGL_SUCCESS)
+                qWarning("QGLWindowSurface: could not enable preserved swap behaviour");
+        } else {
+            eglSurfaceAttrib(ctx->d_func()->eglContext->display(),
+                                            ctx->d_func()->eglSurface,
+                                            EGL_SWAP_BEHAVIOR, EGL_BUFFER_DESTROYED);
+
+            if (eglGetError() != EGL_SUCCESS)
+                qWarning("QGLWindowSurface: could not enable destroyed swap behaviour");
         }
-#endif
     }
 #endif