Mutable images and transparency

[done]

I had the same problem, using com.nokia.mid.ui.DirectGraphics helped.

Image myImage = Image.createImage ("/blah.png"
Image mutableImage = Image.createImage (100, 100);
Graphics gfx = mutableImage.getGraphics ();
DirectGraphics dg = DirectUtils.getDirectGraphics(gfx);
dg.drawImage (myImage, 0, 0, Graphics.TOP | Graphics.LEFT,0);
...
//transparency is kept now, don't ask me why
DirectGraphics dg = DirectUtils.getDirectGraphics(g);
dg.drawImage (mutableImage, 0, 0, Graphics.TOP | Graphics.LEFT);

hth, Dan

[Kiigan]

Really simple question (I think):

I have a PNG which has a single index transparent colour (0xffffff). If I load the image and display it using Image.createImage(...) and Graphics.drawImage (...) it displays correctly (i.e. transparent, so the background is visible).

e.g.
Image myImage = Image.createImage ("/blah.png"
...
// this looks correct
g.drawImage (myImage, 0, 0, Graphics.TOP | Graphics.LEFT);

HOWEVER if I create a new mutable Image using Image.createImage (width, height) and then clip and draw portions from the immutable image into it, and then draw the new mutable image, I lose the transparency information i.e. I have a big white box around the image

e.g.

Image myImage = Image.createImage ("/blah.png"
Image mutableImage = Image.createImage (100, 100);
Graphics gfx = mutableImage.getGraphics ();
gfx.drawImage (myImage, 0, 0, Graphics.TOP | Graphics.LEFT);
...
// this doesn't look correct
g.drawImage (mutableImage, 0, 0, Graphics.TOP | Graphics.LEFT);

Basically I'm writing a bitmap font system for a game menu, and I need a way to create mutable images containing menu elements (strings) that have been rendered. Is there a way to keep the transparency info, or to set it in the new mutable Image?

thanks

Ian