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-rw-r--r--src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx b/src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx
index 05f3bd598..68cb70833 100644
--- a/src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx
+++ b/src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx
@@ -870,7 +870,7 @@ void Fl_Xlib_Graphics_Driver::cache(Fl_Pixmap *pxm) {
Fl_Image_Surface *surf = new Fl_Image_Surface(pxm->data_w(), pxm->data_h());
Fl_Surface_Device::push_current(surf);
uchar **pbitmap = surf->driver()->mask_bitmap();
- *pbitmap = 0;
+ *pbitmap = (uchar*)1;// will instruct fl_draw_pixmap() to compute the image's mask
fl_draw_pixmap(pxm->data(), 0, 0, FL_BLACK);
uchar *bitmap = *pbitmap;
if (bitmap) {