Png Loading

[FatalError]

Hi !
Is it normal that it takes about 3 seconds to load a 176x208 png image on a 7650 (the real device).
Don't you think it's a long long time... we have to wait 3 seconds in the menus for examples just to show a credits screen !!!

All I do is a
Image tmp = mage.createImage(fileName);

Does someone has an idea or a comment ?

Thanks

[killarkai]

you might want to show your full source code, coz i do load big images but it doesn't require 3 seconds. Did you try on the actual device?

[FatalError]

Here's my code. Note that I tested on the real Nokia 7650 and it takes about 3 seconds to switch between images. The images are 176x208 png of about 20Ko.
Thanks

public class ScreenManager extends FullCanvas implements Runnable
{
protected Image background;
protected Graphics backgroundGfx;
protected Midlet parent = null;
private static ScreenManager instance = null;
private Thread t;
private byte state; // state of the game

private ScreenManager(Midlet parent)
{
this.parent = parent; // save the parent
state = 0;
t=new Thread(this);
t.start();
try
{
background = Image.createImage(GfxSystem.gfxDir+"title.png");
backgroundGfx = background.getGraphics();
}
catch( Exception e )
{
System.out.println(e.getMessage());
}
} /* constructor Screen */

public static void initInstance(Midlet parent)
{
if( instance == null )
instance = new ScreenManager(parent);
} /* initInstance */

public static ScreenManager getInstance()
{
return instance;
} /* getInstance */

protected void paint( Graphics g )
{
g.drawImage( background,0,0,0 );
} /* paint */

/**
* keyPressed
*
* called if a key has been hit
*/
protected void keyPressed( int keyCode )
{
String backFile = null;
if ( state == 0 )
backFile = new String("credits.png");
if ( state == 1 )
backFile = new String("gamescreen.png");
if ( state == 2 )
backFile = new String("title.png");
if( state == 3 )
parent.notifyDestroyed();
state++;
try
{
background = Image.createImage(GfxSystem.gfxDir+backFile);
backgroundGfx = background.getGraphics();
}
catch( Exception e )
{
System.out.println(e.getMessage());
parent.notifyDestroyed();
}

} /* keyPressed */

/**
* run
*/
public void run()
{
running = true;
while( running )
{
repaint();
} // end while running
} /* run */

} /* Screen class */

[shmoove]

Loading an Image should definitely take a lot less than a few seconds.

public void run()
{
running = true;
while( running )
{
repaint();
} // end while running
} /* run */

I think this is your problem. You are queuing up a LOT of repaint()s without waiting for the previous ones to finish, so I think you app just spends a while catching up on old repaint()s after you have changed the picture. Try with a serviceRepaints() in there right after the repaint(). Or even better find a more appropiate way to animate the canvas...

shmoove

[tinkezione]

Paint doesn't seem to do anything else but just put the image to the screen. Why bother doing that repeatedly if a simple repaint(); with serviceRepaints(); call in the key detection method will do the trick as well?

Kind regards,
Tinke / FN

[FatalError]

you were right, it was this thread who ran again and again.
The code is a very simplified version... I need to repaint continusly
because they are a lot of things moving on the screen.
But now it's ok, I stop the thread when I don't need to draw the screen
Thanks