In the code below, the PNG image I'm loading is not displayed immediately. I've
been unable to overcome the delay before it is displayed, although I'm told the
image should be ready to display immediately after loading (i.e., the
constructor returns). What am I doing wrong?
Thanks,
Robb.
<code>
------------------------
#include <FL/Fl.H>
#include <FL/Fl_Shared_Image.H>
#include <FL/Fl_Single_Window.H>
#include <FL/Fl_PNG_Image.H>
#include <FL/Fl_Button.H>
// for usleep used in main()
#include <unistd.h>
class splashWindow : public Fl_Window {
Fl_PNG_Image *pBGImage;
protected:
virtual void draw() {
Fl_Window::draw(); // Draw window widget first
if ( pBGImage )
pBGImage->draw(x(),y()); // draw PNG image
over the above
}
public:
// Constructor
splashWindow(int X, int Y, int W, int H, char *pszTitle, char
*pszBGImage) : Fl_Window(X,Y,W,H) {
pBGImage = new Fl_PNG_Image( pszBGImage );
border(0);
end();
// flush(); // give fltk some cpu to update the
screen
// show();
}
};
class myWindow : public Fl_Window {
splashWindow *pSplashWin;
public:
void show() {
Fl_Window::show(); // Show main window widget
first
if (pSplashWin) {
// Cleanup
remove( pSplashWin ); // remove splash window
delete( pSplashWin ); // deallocate it
pSplashWin = 0;
}
} // show()
// Constructor
myWindow(int X, int Y, int W, int H) : Fl_Window(X,Y,W,H) {
splashWindow *pTmp;
pSplashWin = 0;
// Create Splash Screen child window
pTmp = new splashWindow( X, Y, W, H, "My Splash",
"./splash-bg3.png" );
// Fl::flush();
// Fl::check(); // give fltk some cpu to update
the screen
// Add a button to the main screen, so we know when it's
displayed.
Fl_Button *btn1 = new Fl_Button(40, 40, 200, 200, "MAIN WINDOW"
);
end();
show();
Fl::check(); // give fltk some cpu to update
the screen
// Fl::flush();
pSplashWin = pTmp;
}
};
int main(int argc, char ** argv) {
fl_register_images();
Fl::scheme("plastic");
Fl_Window *pWin = new myWindow(0, 0, 640, 480);
// wait while splash is displayed
/*
There is a noticeable delay before the PNG image appears,
because the
picture is NOT rendered by the first itteration of the loop
below.
The picture is rendered when Fl::check() is called.
I tried numerous different things (see constructor above), in
order to
"flush" the PNG image to the display immediately, but nothing
worked.
*/
for (int i=0; i<3; i++ ) {
usleep( 1000000 );
Fl::check();
}
// Now show the main window - this will remove the splash screen
pWin->show();
return Fl::run();
}
------------------------
<end code>
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