MacArthur, Ian (SELEX GALILEO, UK) schrieb:
> of course.
Finally I found what causes my problem - it is because of the menu!
When I call my offscreen-drawing from a button, it works, when I call it
from the menu, it fails "X_FreePixmap: BadPixmap (invalid Pixmap
parameter) 0x340001e". This is easy to solve (timer), but was hard to
find...
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Menu_Bar.H>
#include <FL/fl_draw.H>
#include <FL/x.H>
#include "write_png.h"
#include <w_time.h>
Fl_Window* pMW= 0;
void Cb_Bn(Fl_Widget* o, void* v)
{
enum { ow= 400, oh= 400 };
if (Fl_Offscreen OF= fl_create_offscreen(ow, oh))
{
fl_begin_offscreen(OF);
fl_rectf(0, 0, ow, oh, Fl_Color(w_time().Seconds()% 15));
for (int i= 10; i< 100; i+= 10) fl_rect(i, i, ow -2*i, oh -2*i,
Fl_Color(i%15));
if (unsigned char* pImage= fl_read_image(0, 0, 0, ow, oh, 0))
{ // Get image
write_png("/home/ed/temp/test.png", pImage, ow, oh, 3);
delete[] pImage;
}
fl_end_offscreen();
fl_delete_offscreen(OF);
}
}
int main()
{
Fl_Window Win(100, 100, 640, 480, "Offscreen Image");
pMW= &Win;
Fl_Menu_Bar *pMenu= new Fl_Menu_Bar(0, 0, Win.w(), 25);
pMenu->add("&Draw-Demo",0,0,0,FL_SUBMENU);
pMenu->add("Draw-Demo/&Export", 0, Cb_Bn);
Fl_Button* pB= new Fl_Button(10, 100, 100, 100, "&Export Png");
Win.resizable(pMW);
pB->callback(Cb_Bn, 0);
pB->when(FL_WHEN_RELEASE);
Win.end();
Win.show();
return Fl::run();
}
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