Albrecht, Alvin, Ian:
I recoded a bit, in particular I derived a class from
Fl_Double_Window. Now the area of the main window which is covered by
the Fl_File_Chooser when starting to save is dumped as a black region.
If the Fl_File_Chooser doesn't cover at all the window the dump is Ok.
Using fl_begin_offscreen()/fl_end_offscreen() does not alter the
result. I guess that a really quick-and-dirty solution would be to add
a time delay before reading. The code follows.
Rodrigo
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Button.H>
#include <FL/fl_draw.H>
#include <FL/x.H>
#include <FL/Fl_File_Chooser.H>
#include <stdlib.h>
#include <stdio.h>
class MyWindow : public Fl_Double_Window {
public:
MyWindow(int x, int y, int w, int h, const char
*l):Fl_Double_Window(x, y, w, h, l){}
void save_pnm(const char *name){
Fl_Offscreen off = fl_create_offscreen(w(), h());
FILE *fp;
if ((fp = fopen(name, "w+")) == 0) {
perror("open");
return;
}
uchar *buf = (uchar*)malloc(3*w()*h()*sizeof(uchar));
make_current();
//fl_begin_offscreen(off);
for (int i = 0; i < children(); i++){
child(i)->damage(FL_DAMAGE_ALL);
child(i)->redraw();
}
redraw();
Fl::flush();
fl_read_image(buf, 0, 0, w(), h());
//fl_end_offscreen();
fprintf(fp, "P6\n%d %d\n255\n", w(), h());
fwrite((uchar*)buf, w()*h()*3, 1, fp);
fclose(fp);
free(buf);
fl_delete_offscreen(off);
return;
}
};
void wincb(Fl_Widget*, void *w){
MyWindow *win = (MyWindow*)w;
win->save_pnm("fig.pnm");
exit(0);
return;
}
void btncb(Fl_Widget*, void *w){
MyWindow *win = (MyWindow*)w;
Fl_File_Chooser chooser(".", "*.pnm", Fl_File_Chooser::CREATE,
"Save as PNM");
chooser.show();
while(chooser.shown()) Fl::wait();
if (chooser.value() != NULL){
win->save_pnm(chooser.value());
}
return;
}
int main(int argc, char *argv[]){
MyWindow win(10, 10, 200, 100, "Test");
Fl_Button btn(10, 10, win.w() - 20, win.h() - 20, "Save as PNM");
btn.callback(btncb, &win);
win.end();
win.callback(wincb, &win);
win.show();
return Fl::run();
}
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