diff options
Diffstat (limited to 'src/Fl_Screen_Driver.cxx')
| -rw-r--r-- | src/Fl_Screen_Driver.cxx | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/Fl_Screen_Driver.cxx b/src/Fl_Screen_Driver.cxx index c42cefe1c..4f4bbff7f 100644 --- a/src/Fl_Screen_Driver.cxx +++ b/src/Fl_Screen_Driver.cxx @@ -184,7 +184,8 @@ Image depths can differ between "to" and "from". will be partially overwritten with the new capture Return value: - An Fl_RGB_Image*, the depth of which is platform-dependent, containing the captured pixels. + An Fl_RGB_Image*, the depth of which is platform-dependent, containing the captured pixels, + or NULL if capture failed. */ Fl_RGB_Image *Fl_Screen_Driver::traverse_to_gl_subwindows(Fl_Group *g, int x, int y, int w, int h, Fl_RGB_Image *full_img) @@ -198,6 +199,7 @@ Fl_RGB_Image *Fl_Screen_Driver::traverse_to_gl_subwindows(Fl_Group *g, int x, in if (Fl_Window::current() != g) g->as_window()->make_current(); full_img = Fl::screen_driver()->read_win_rectangle(x, y, w, h); } + if (!full_img) return NULL; float full_img_scale = (full_img && w > 0 ? float(full_img->data_w())/w : 1); int n = g->children(); for (int i = 0; i < n; i++) { |