path: root/src/gui
diff options
authorAllan Sandfeld Jensen <>2016-08-23 13:55:08 +0200
committerTor Arne Vestbø <>2018-08-03 18:18:13 +0000
commit3014e2bf01ab256531f71dc97efcdaec07cd23cc (patch)
tree3f940198fab7dc8a1178a11f7ee10d9885ea4a31 /src/gui
parentb9b53adb69bd75e09b2ac96256594baa62c6c06d (diff)
Don't ignore alpha values in grabFramebuffer methods
Returns an ARGB32_Premultiplied image when the framebuffer is grabbed on a transparent QOpenGLWidget or QOpenGLWindow. Task-number: QTBUG-55245 Change-Id: I4b7778ecc38275be1ed9fb748c77c7e1f6b65a00 Reviewed-by: Tor Arne Vestbø <>
Diffstat (limited to 'src/gui')
1 files changed, 4 insertions, 2 deletions
diff --git a/src/gui/kernel/qopenglwindow.cpp b/src/gui/kernel/qopenglwindow.cpp
index c3a264f1e8..8b052d92ae 100644
--- a/src/gui/kernel/qopenglwindow.cpp
+++ b/src/gui/kernel/qopenglwindow.cpp
@@ -511,7 +511,7 @@ GLuint QOpenGLWindow::defaultFramebufferObject() const
extern Q_GUI_EXPORT QImage qt_gl_read_framebuffer(const QSize &size, bool alpha_format, bool include_alpha);
- Returns a 32-bit RGB image of the framebuffer.
+ Returns a copy of the framebuffer.
\note This is a potentially expensive operation because it relies on
glReadPixels() to read back the pixels. This may be slow and can stall the
@@ -531,7 +531,9 @@ QImage QOpenGLWindow::grabFramebuffer()
return QImage();
- QImage img = qt_gl_read_framebuffer(size() * devicePixelRatio(), false, false);
+ const bool hasAlpha = format().hasAlpha();
+ QImage img = qt_gl_read_framebuffer(size() * devicePixelRatio(), hasAlpha, hasAlpha);
return img;