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Make QT_MAC_OPENGL_SURFACE_ORDER=-1 work better

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Mark the window as not opaque and give it a transparent
background when layering OpenGL below the window.

Change-Id: I2188842249c592f17619f7a2c3ef1fd30958987e
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
This commit is contained in:
Morten Johan Sørvig 2014-05-22 09:38:34 +02:00 committed by The Qt Project
parent 1ac0f953ba
commit b214c177ea
1 changed files with 13 additions and 2 deletions
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15
src/plugins/platforms/cocoa/qcocoawindow.mm
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@ -999,9 +999,14 @@ bool QCocoaWindow::isExposed() const
bool QCocoaWindow::isOpaque() const
{
// OpenGL surfaces can be ordered either above(default) or below the NSWindow.
// When ordering below the window must be tranclucent.
static GLint openglSourfaceOrder = qt_mac_resolveOption(1, "QT_MAC_OPENGL_SURFACE_ORDER");
bool translucent = (window()->format().alphaBufferSize() > 0
|| window()->opacity() < 1
|| (m_qtView && [m_qtView hasMask]));
|| (m_qtView && [m_qtView hasMask]))
|| (surface()->supportsOpenGL() && openglSourfaceOrder == -1);
return !translucent;
}
@ -1402,7 +1407,13 @@ QCocoaNSWindow * QCocoaWindow::createNSWindow()
NSInteger level = windowLevel(flags);
[createdWindow setLevel:level];
if (window()->format().alphaBufferSize() > 0) {
// OpenGL surfaces can be ordered either above(default) or below the NSWindow.
// When ordering below the window must be tranclucent and have a clear background color.
static GLint openglSourfaceOrder = qt_mac_resolveOption(1, "QT_MAC_OPENGL_SURFACE_ORDER");
bool isTranslucent = window()->format().alphaBufferSize() > 0
|| (surface()->supportsOpenGL() && openglSourfaceOrder == -1);
if (isTranslucent) {
[createdWindow setBackgroundColor:[NSColor clearColor]];
[createdWindow setOpaque:NO];
}