> Is there a special way to connect fl_read_image() to offscreen buffer?
> Maybe the real problem comes from this function? Do I need some
> make_current()? But I'm using the offscreen inside of draw(), so drawing
> should work.
You need to "begin" the offscreen just before you call fl_read_image() and
"end" it once the read is complete. You can do that pretty much anywhere, not
just in a draw method, and that's one of the "advantages" of using the
offscreen approach...
/*****************************************************************************/
uchar *data_p = NULL;
static void cb_bt_grab(Fl_Button*, void*)
{
if(oscr) { // offscreen exists, grab something
if(data_p){
delete[] data_p;
data_p = NULL;
}
fl_begin_offscreen(oscr); /* Open the offscreen context for
drawing */
data_p = fl_read_image(data_p, 0, 0, os_w, os_h, 0);
write_png("Test1.png", data_p, os_w, os_h, 3, "SS7K-imageV2",
"Fixed Text String");
fl_end_offscreen(); // close the offscreen context
}
} // cb_bt_grab
/*****************************************************************************/
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