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New reduceColors(): try JIMI ColorReducer first, which preserves transparency, but

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throws an exception for some images. If that fails, use the alternative color reduction code
from helma 1.2.
This commit is contained in:
hns 2003-08-07 13:04:05 +00:00
parent 17427e1e16
commit be94b98311
1 changed files with 25 additions and 15 deletions
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40
src/helma/image/SunImageWrapper.java
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@ -44,28 +44,38 @@ public class SunImageWrapper extends ImageWrapper {
}
/**
* Reduce the colors used in this image. Useful and necessary before saving
* the image as GIF file.
*
*
* @param colors ...
* @param colors the number of colors to use, usually <= 256.
*/
public void reduceColors(int colors) {
try {
int[][] pixels = getPixels();
int[] palette = Quantize.quantizeImage(pixels, colors);
int w = pixels.length;
int h = pixels[0].length;
int[] pix = new int[w * h];
// first, try to use JIMI's ColorReducer class. It is able to
// preserve transparency on GIF files, but does throw exceptions on some GIFs.
img = new ColorReducer(colors, false).getColorReducedImage(img);
} catch (Exception excpt) {
// JIMI sometimes fails to reduce colors, throwing an exception.
// Use our alternative Quantizer in this case.
System.err.println("Using alternative color reducer ("+excpt+")");
try {
int[][] pixels = getPixels();
int[] palette = Quantize.quantizeImage(pixels, colors);
int w = pixels.length;
int h = pixels[0].length;
int[] pix = new int[w * h];
// convert to RGB
for (int x = w; x-- > 0;) {
for (int y = h; y-- > 0;) {
pix[(y * w) + x] = palette[pixels[x][y]];
// convert to RGB
for (int x = w; x-- > 0;) {
for (int y = h; y-- > 0;) {
pix[(y * w) + x] = palette[pixels[x][y]];
}
}
}
img = imggen.createImage(new MemoryImageSource(w, h, pix, 0, w));
} catch (Exception x) {
// throw new RuntimeException (x.getMessage ());
img = imggen.createImage(new MemoryImageSource(w, h, pix, 0, w));
} catch (IOException ioxcpt) {
System.err.println("Error in reduceColors(): "+ioxcpt);
}
}
}