path: root/src/opengl
diff options
Diffstat (limited to 'src/opengl')
2 files changed, 8 insertions, 0 deletions
diff --git a/src/opengl/qgl.cpp b/src/opengl/qgl.cpp
index e602a05af9..637cfc55a8 100644
--- a/src/opengl/qgl.cpp
+++ b/src/opengl/qgl.cpp
@@ -4083,6 +4083,11 @@ QPixmap QGLWidget::renderPixmap(int w, int h, bool useContext)
Depending on your hardware, you can explicitly select which color
buffer to grab with a glReadBuffer() call before calling this
+ On QNX the back buffer is not preserved when swapBuffers() is called. The back buffer
+ where this function reads from, might thus not contain the same content as the front buffer.
+ In order to retrieve what is currently visible on the screen, swapBuffers()
+ has to be executed prior to this function call.
QImage QGLWidget::grabFrameBuffer(bool withAlpha)
diff --git a/src/opengl/qglframebufferobject.cpp b/src/opengl/qglframebufferobject.cpp
index d636da91b5..bd8bc2f64a 100644
--- a/src/opengl/qglframebufferobject.cpp
+++ b/src/opengl/qglframebufferobject.cpp
@@ -1114,6 +1114,9 @@ QGLFramebufferObjectFormat QGLFramebufferObject::format() const
\fn QImage QGLFramebufferObject::toImage() const
Returns the contents of this framebuffer object as a QImage.
+ On QNX the back buffer is not preserved when a buffer swap occures. So this function
+ might return old content.
QImage QGLFramebufferObject::toImage() const