public BufferedImage filter(BufferedImage src, BufferedImage dst) {
int width = src.getWidth();
int height = src.getHeight();
if (dst == null) dst = createCompatibleDestImage(src, null);
int[] inPixels = new int[width * height];
int[] outPixels = new int[width * height];
getRGB(src, 0, 0, width, height, inPixels);
if (premultiplyAlpha) ImageMath.premultiply(inPixels, 0, inPixels.length);
convolve(kernel, inPixels, outPixels, width, height, alpha, edgeAction);
if (premultiplyAlpha) ImageMath.unpremultiply(outPixels, 0, outPixels.length);
setRGB(dst, 0, 0, width, height, outPixels);
return dst;
}
public static void blur(int[] in, int[] out, int width, int height, int radius) {
int widthMinus1 = width - 1;
int tableSize = 2 * radius + 1;
int divide[] = new int[256 * tableSize];
for (int i = 0; i < 256 * tableSize; i++) divide[i] = i / tableSize;
int inIndex = 0;
for (int y = 0; y < height; y++) {
int outIndex = y;
int ta = 0, tr = 0, tg = 0, tb = 0;
for (int i = -radius; i <= radius; i++) {
int rgb = in[inIndex + ImageMath.clamp(i, 0, width - 1)];
ta += (rgb >> 24) & 0xff;
tr += (rgb >> 16) & 0xff;
tg += (rgb >> 8) & 0xff;
tb += rgb & 0xff;
}
for (int x = 0; x < width; x++) {
out[outIndex] = (divide[ta] << 24) | (divide[tr] << 16) | (divide[tg] << 8) | divide[tb];
int i1 = x + radius + 1;
if (i1 > widthMinus1) i1 = widthMinus1;
int i2 = x - radius;
if (i2 < 0) i2 = 0;
int rgb1 = in[inIndex + i1];
int rgb2 = in[inIndex + i2];
ta += ((rgb1 >> 24) & 0xff) - ((rgb2 >> 24) & 0xff);
tr += ((rgb1 & 0xff0000) - (rgb2 & 0xff0000)) >> 16;
tg += ((rgb1 & 0xff00) - (rgb2 & 0xff00)) >> 8;
tb += (rgb1 & 0xff) - (rgb2 & 0xff);
outIndex += height;
}
inIndex += width;
}
}