Saving image as icns

[AdrianBV]

hi to all.

 

I've been beating my head against the wall for a couple of days now trying to save a image as a valid ICNS file ( ICNS is the icon format for Mac OS ).
 

Let's say I have a image of 128 x 128. I've managed to get the color and opacity for each pixel but I'm not really sure how the ICNS file format wants this data compressed.

 

I found some pseudo-code but i can't figure out from that what I have to do: http://www.macdisk.com/maciconen.php3#RLE

 

More info about icns file can be found on wiki: http://en.wikipedia.org/wiki/Apple_Icon_Image

 

Does anybody have any good ideeas about this ?

 

As wiki says, ( for example ) the 128 x 128 icns file should have the header it32, the 48x48 ih32, the 32x32 - il32 and the 16x16 - is32

		$im = imagecreatefrompng("128.png");
		$width = imagesx( $im );
		$height = imagesy( $im );		
		$pixel_data = array();
		$opacity_data = array();
		$current_opacity_val = 0;
		for ( $y = $height - 1; $y >= 0; $y-- ) {
			for ( $x = 0; $x < $width; $x++ ) {
				$color = imagecolorat( $im, $x, $y );
				$alpha = ( $color & 0x7F000000 ) >> 24;
				$alpha = ( 1 - ( $alpha / 127 ) ) * 255;
				$color &= 0xFFFFFF;
				$color |= 0xFF000000 & ( $alpha << 24 );
				$pixel_data[] = $color;
				$opacity = ( $alpha <= 127 ) ? 1 : 0;
				$current_opacity_val = ( $current_opacity_val << 1 ) | $opacity;
				if ( ( ( $x + 1 ) % 32 ) == 0 ) {
					$opacity_data[] = $current_opacity_val;
					$current_opacity_val = 0;
				}
			}
			if ( ( $x % 32 ) > 0 ) {
				while ( ( $x++ % 32 ) > 0 )
					$current_opacity_val = $current_opacity_val << 1;
				
				$opacity_data[] = $current_opacity_val;
				$current_opacity_val = 0;
			}
		}

Thanks in advance for any help you can offer.

[AdrianBV]

Nobody ?