Check the framebuffer format against a format, not a texture target

The previous code was comparing QGLFramebufferObjectFormat::textureTarget()
against GL_RGB to determine if alpha was present.  This should be
internalTextureFormat() instead.

Reviewed-by: Sarah Smith

1 files changed, 1 insertions, 1 deletions

diff --git a/src/opengl/qglframebufferobject.cpp b/src/opengl/qglframebufferobject.cpp
index 3e54b353fa..558520823d 100644
--- a/src/opengl/qglframebufferobject.cpp
+++ b/src/opengl/qglframebufferobject.cpp
@@ -988,7 +988,7 @@ QImage QGLFramebufferObject::toImage() const
     bool wasBound = isBound();
     if (!wasBound)
         const_cast<QGLFramebufferObject *>(this)->bind();
-    QImage image = qt_gl_read_framebuffer(d->size, format().textureTarget() != GL_RGB, true);
+    QImage image = qt_gl_read_framebuffer(d->size, format().internalTextureFormat() != GL_RGB, true);
     if (!wasBound)
         const_cast<QGLFramebufferObject *>(this)->release();