高斯模糊

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public class FastBlur {    /**     * 水平方向模糊度     */    private static float hRadius = 10;    /**     * 竖直方向模糊度     */    private static float vRadius = 10;    /**     * 模糊迭代度     */    private static int iterations = 7;    /**     * 高斯模糊     */    public static Drawable BoxBlurFilter(Bitmap bmp) {        int width = bmp.getWidth();        int height = bmp.getHeight();        int[] inPixels = new int[width * height];        int[] outPixels = new int[width * height];        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);        bmp.getPixels(inPixels, 0, width, 0, 0, width, height);        for (int i = 0; i < iterations; i++) {            blur(inPixels, outPixels, width, height, hRadius);            blur(outPixels, inPixels, height, width, vRadius);        }        blurFractional(inPixels, outPixels, width, height, hRadius);        blurFractional(outPixels, inPixels, height, width, vRadius);        bitmap.setPixels(inPixels, 0, width, 0, 0, width, height);        Drawable drawable = new BitmapDrawable(bitmap);        return drawable;    }    public static void blur(int[] in, int[] out, int width, int height, float radius) {        int widthMinus1 = width - 1;        int r = (int) radius;        int tableSize = 2 * r + 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 = -r; i <= r; i++) {                int rgb = in[inIndex + 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 + r + 1;                if (i1 > widthMinus1)                    i1 = widthMinus1;                int i2 = x - r;                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;        }    }    public static void blurFractional(int[] in, int[] out, int width, int height, float radius) {        radius -= (int) radius;        float f = 1.0f / (1 + 2 * radius);        int inIndex = 0;        for (int y = 0; y < height; y++) {            int outIndex = y;            out[outIndex] = in[0];            outIndex += height;            for (int x = 1; x < width - 1; x++) {                int i = inIndex + x;                int rgb1 = in[i - 1];                int rgb2 = in[i];                int rgb3 = in[i + 1];                int a1 = (rgb1 >> 24) & 0xff;                int r1 = (rgb1 >> 16) & 0xff;                int g1 = (rgb1 >> 8) & 0xff;                int b1 = rgb1 & 0xff;                int a2 = (rgb2 >> 24) & 0xff;                int r2 = (rgb2 >> 16) & 0xff;                int g2 = (rgb2 >> 8) & 0xff;                int b2 = rgb2 & 0xff;                int a3 = (rgb3 >> 24) & 0xff;                int r3 = (rgb3 >> 16) & 0xff;                int g3 = (rgb3 >> 8) & 0xff;                int b3 = rgb3 & 0xff;                a1 = a2 + (int) ((a1 + a3) * radius);                r1 = r2 + (int) ((r1 + r3) * radius);                g1 = g2 + (int) ((g1 + g3) * radius);                b1 = b2 + (int) ((b1 + b3) * radius);                a1 *= f;                r1 *= f;                g1 *= f;                b1 *= f;                out[outIndex] = (a1 << 24) | (r1 << 16) | (g1 << 8) | b1;                outIndex += height;            }            out[outIndex] = in[width - 1];            inIndex += width;        }    }    public static int clamp(int x, int a, int b) {        return (x < a) ? a : (x > b) ? b : x;    }}
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