Hello all.
I'm having a heck of a time getting my first Image I/O reader done; I'm
hoping someone here can help me out. I've been using the Image I/O
guide to help me out, and I'm able to properly read in my image now, but
I have not been able to properly construct my BufferedImage to return
from read() yet.
The image I am dealing with a sprite format for a small game. It can
hold more then 1 image per file and has a 1024 byte palette at the end
of the file. I am able to read all the information out correctly, and I
can even write a BMP file to the drive. But I'm lost in getting all
that data into the BufferedImage.
Based on looking at the com.sun.imageio.plugins.gif.GIFImageReader
class, I put together the following getImageTypes() function:
public Iterator getImageTypes(int imageIndex) throws IOException {
readHeader();
/** verify the index is valid */
if (imageIndex < 0 || imageIndex >= imgCount)
throw new IndexOutOfBoundsException("bad index");
/** output file is 8-bit */
int bits = 8;
int lutLength = 1 << bits;
byte[] r = new byte[lutLength];
byte[] g = new byte[lutLength];
byte[] b = new byte[lutLength];
byte[] a = new byte[lutLength];
int rgbIndex = 0;
for (int i=0; i < sprPalette.length / 4; i++) {
r[i] = sprPalette[rgbIndex++];
g[i] = sprPalette[rgbIndex++];
b[i] = sprPalette[rgbIndex++];
a[i] = sprPalette[rgbIndex++];
}
ImageTypeSpecifier imageType = ImageTypeSpecifier.createIndexed(
r, g, b, a, bits, DataBuffer.TYPE_BYTE);
ArrayList list = new ArrayList();
list.add(imageType);
return list.iterator();
}
I'm almost positive my RPBA order is incorrect, but that *should* just
result in funky colors in my final image. Yes?
I thought about including the block of code that I currently have setup
to create my BufferedImage, but why mock myself further. :) The data I
have is actually very easy to explain... in the uncompressed state, it
is a valid BMP image data block and be written straight out to file as such.
With a properly constructed ImageTypeSpecifier, how could I take a
valid BMP image data block and construct a BufferedImage suitable for
output?
I did a short search for the JAI Image I/O API source, for the BMP
reader, but couldn't find it.
Any help in this matter is greatly appreciated! I have been fighting
this for days.
Nick
===========================================================================
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff JAVA2D-INTEREST". For general help, send email to
[EMAIL PROTECTED] and include in the body of the message "help".
