CODEWITHSUNDEEP
java-mefonts
Ali.M
Ali.M

Reputation: 311

j2me: using custom fonts(bitmap) performance


I want to use custom fonts in my j2me application. so I created a png file contains all needed glyph and an array of glyphs width and another for glyphs offset in PNG file.

Now, I want to render a text in my app using above font within a gameCanvas class. but when I use the following code, rendering text in real device is very slow.

Note: the text is coded(for some purposes) to bytes and stored in this.text variable. 242=[space],241=[\n] and 243=[\r].

int textIndex = 0;
while(textIndex < this.text.length)
{
  int index = this.text[textIndex] & 0xFF;
  if(index > 243)
  {
      continue;
  }
  else if(index == 242) lineLeft += 3;
  else if(index == 241 || index == 243) 
  {
      top += font.getHeight();
      lineLeft = 0;
      continue;
  }
  else
  {
    lineLeft += widths[index];
    if(lineLeft <= getWidth()) 
        lineLeft = 0;
    int left = starts[index];
    int charWidth = widths[index];
    try{
        bg.drawRegion(font, left, 0, charWidth, font.getHeight(), 0, lineLeft, top, Graphics.LEFT|Graphics.TOP);
    }catch(Exception ee)
    {
    }
  }
  textIndex++;
}

Can anyone help me to improve performance and speed in my code?

At end sorry for my bad English and thanks in advanced.:)

Edit: I changed line

 bg.drawRegion(font, left, 0, charWidth, font.getHeight(), 0, lineLeft, top, Graphics.LEFT|Graphics.TOP);

To:

bg.clipRect(left, top, charWidth, font.getHeight());
bg.drawImage(font, lineLeft - left, top,0)
bg.setClip(0, 0, getWidth(), getHeight());

but there was no difference in speed!!

any help please!!

Can anyone plz help me to improve my app?

text will appear after 2-3 seconds in real device by this code, I want reduce this time to milliseconds. this is very important for me.

Can I use threads? If yes, How?

Upvotes: 1

Views: 1266

Answers (2)

Kiran Kuppa
Kiran Kuppa

Reputation: 1457

I would advice you to look into this library. The implementation is quite good and makes use of industry standard design patters ( Flyweight pattern, predominantly) and robust.

Upvotes: 0

Wonil
Wonil

Reputation: 6727

I can't sure why your code's performance is not good in real device. But, how about refer some well known open source J2ME libraries to check it's text drawing implementation for example, LWUIT.

http://java.net/projects/lwuit/sources/svn/content/LWUIT_1_5/UI/src/com/sun/lwuit/CustomFont.java?rev=1628

You can find from the above link it's font drawing implementation. It uses drawImage rather than drawRegion.

Upvotes: 2

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