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Diffstat (limited to 'src/openvg/qwindowsurface_vgegl.cpp')
-rw-r--r--src/openvg/qwindowsurface_vgegl.cpp9
1 files changed, 5 insertions, 4 deletions
diff --git a/src/openvg/qwindowsurface_vgegl.cpp b/src/openvg/qwindowsurface_vgegl.cpp
index 866453f..3205a11 100644
--- a/src/openvg/qwindowsurface_vgegl.cpp
+++ b/src/openvg/qwindowsurface_vgegl.cpp
@@ -269,19 +269,20 @@ static QEglContext *createContext(QPaintDevice *device)
configProps.setPixelFormat(QImage::Format_ARGB32); // XXX
configProps.setValue(EGL_ALPHA_MASK_SIZE, 1);
#ifdef EGL_VG_ALPHA_FORMAT_PRE_BIT
- configProps.setValue(EGL_SURFACE_TYPE, EGL_WINDOW_BIT |
- EGL_VG_ALPHA_FORMAT_PRE_BIT);
+ configProps.setValue(EGL_SURFACE_TYPE, EGL_WINDOW_BIT
+ | EGL_SWAP_BEHAVIOR_PRESERVED_BIT
+ | EGL_VG_ALPHA_FORMAT_PRE_BIT);
configProps.setRenderableType(QEgl::OpenVG);
if (!context->chooseConfig(configProps)) {
// Try again without the "pre" bit.
- configProps.setValue(EGL_SURFACE_TYPE, EGL_WINDOW_BIT);
+ configProps.setValue(EGL_SURFACE_TYPE, EGL_WINDOW_BIT | EGL_SWAP_BEHAVIOR_PRESERVED_BIT);
if (!context->chooseConfig(configProps)) {
delete context;
return 0;
}
}
#else
- configProps.setValue(EGL_SURFACE_TYPE, EGL_WINDOW_BIT);
+ configProps.setValue(EGL_SURFACE_TYPE, EGL_WINDOW_BIT | EGL_SWAP_BEHAVIOR_PRESERVED_BIT);
configProps.setRenderableType(QEgl::OpenVG);
if (!context->chooseConfig(configProps)) {
delete context;