Android 图片基本处理代码段

ImageUtil.java

public class ImageUtil {
    
    /**
     * 图片变灰
     * @param bmpOriginal
     * @return
     */
    public static Bitmap toGrayscale(Bitmap bmpOriginal) {
        int width, height;
        height = bmpOriginal.getHeight();
        width = bmpOriginal.getWidth();

        Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas c = new Canvas(bmpGrayscale);
        Paint paint = new Paint();
        ColorMatrix cm = new ColorMatrix();
        cm.setSaturation(0);
        ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
        paint.setColorFilter(f);
        c.drawBitmap(bmpOriginal, 0, 0, paint);
        return bmpGrayscale;
    }

    // 对Bitmap做高斯模糊处理
    public static Bitmap fastblur(Bitmap sentBitmap, int radius) {

        // Stack Blur v1.0 from
        // http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
        //
        // Java Author: Mario Klingemann <mario at quasimondo.com>
        // http://incubator.quasimondo.com
        // created Feburary 29, 2004
        // Android port : Yahel Bouaziz <yahel at kayenko.com>
        // http://www.kayenko.com
        // ported april 5th, 2012

        // This is a compromise between Gaussian Blur and Box blur
        // It creates much better looking blurs than Box Blur, but is
        // 7x faster than my Gaussian Blur implementation.
        //
        // I called it Stack Blur because this describes best how this
        // filter works internally: it creates a kind of moving stack
        // of colors whilst scanning through the image. Thereby it
        // just has to add one new block of color to the right side
        // of the stack and remove the leftmost color. The remaining
        // colors on the topmost layer of the stack are either added on
        // or reduced by one, depending on if they are on the right or
        // on the left side of the stack.
        //
        // If you are using this algorithm in your code please add
        // the following line:
        //
        // Stack Blur Algorithm by Mario Klingemann <mario@quasimondo.com>

        Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);

        if (radius < 1) {
            return (null);
        }

        int w = bitmap.getWidth();
        int h = bitmap.getHeight();

        int[] pix = new int[w * h];
        Log.e("pix", w + " " + h + " " + pix.length);
        bitmap.getPixels(pix, 0, w, 0, 0, w, h);

        int wm = w - 1;
        int hm = h - 1;
        int wh = w * h;
        int div = radius + radius + 1;

        int r[] = new int[wh];
        int g[] = new int[wh];
        int b[] = new int[wh];
        int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;
        int vmin[] = new int[Math.max(w, h)];

        int divsum = (div + 1) >> 1;
        divsum *= divsum;
        int dv[] = new int[256 * divsum];
        for (i = 0; i < 256 * divsum; i++) {
            dv[i] = (i / divsum);
        }

        yw = yi = 0;

        int[][] stack = new int[div][3];
        int stackpointer;
        int stackstart;
        int[] sir;
        int rbs;
        int r1 = radius + 1;
        int routsum, goutsum, boutsum;
        int rinsum, ginsum, binsum;

        for (y = 0; y < h; y++) {
            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
            for (i = -radius; i <= radius; i++) {
                p = pix[yi + Math.min(wm, Math.max(i, 0))];
                sir = stack[i + radius];
                sir[0] = (p & 0xff0000) >> 16;
                sir[1] = (p & 0x00ff00) >> 8;
                sir[2] = (p & 0x0000ff);
                rbs = r1 - Math.abs(i);
                rsum += sir[0] * rbs;
                gsum += sir[1] * rbs;
                bsum += sir[2] * rbs;
                if (i > 0) {
                    rinsum += sir[0];
                    ginsum += sir[1];
                    binsum += sir[2];
                } else {
                    routsum += sir[0];
                    goutsum += sir[1];
                    boutsum += sir[2];
                }
            }
            stackpointer = radius;

            for (x = 0; x < w; x++) {

                r[yi] = dv[rsum];
                g[yi] = dv[gsum];
                b[yi] = dv[bsum];

                rsum -= routsum;
                gsum -= goutsum;
                bsum -= boutsum;

                stackstart = stackpointer - radius + div;
                sir = stack[stackstart % div];

                routsum -= sir[0];
                goutsum -= sir[1];
                boutsum -= sir[2];

                if (y == 0) {
                    vmin[x] = Math.min(x + radius + 1, wm);
                }
                p = pix[yw + vmin[x]];

                sir[0] = (p & 0xff0000) >> 16;
                sir[1] = (p & 0x00ff00) >> 8;
                sir[2] = (p & 0x0000ff);

                rinsum += sir[0];
                ginsum += sir[1];
                binsum += sir[2];

                rsum += rinsum;
                gsum += ginsum;
                bsum += binsum;

                stackpointer = (stackpointer + 1) % div;
                sir = stack[(stackpointer) % div];

                routsum += sir[0];
                goutsum += sir[1];
                boutsum += sir[2];

                rinsum -= sir[0];
                ginsum -= sir[1];
                binsum -= sir[2];

                yi++;
            }
            yw += w;
        }
        for (x = 0; x < w; x++) {
            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
            yp = -radius * w;
            for (i = -radius; i <= radius; i++) {
                yi = Math.max(0, yp) + x;

                sir = stack[i + radius];

                sir[0] = r[yi];
                sir[1] = g[yi];
                sir[2] = b[yi];

                rbs = r1 - Math.abs(i);

                rsum += r[yi] * rbs;
                gsum += g[yi] * rbs;
                bsum += b[yi] * rbs;

                if (i > 0) {
                    rinsum += sir[0];
                    ginsum += sir[1];
                    binsum += sir[2];
                } else {
                    routsum += sir[0];
                    goutsum += sir[1];
                    boutsum += sir[2];
                }

                if (i < hm) {
                    yp += w;
                }
            }
            yi = x;
            stackpointer = radius;
            for (y = 0; y < h; y++) {
                // Preserve alpha channel: ( 0xff000000 & pix[yi] )
                pix[yi] = ( 0xff000000 & pix[yi] ) | ( dv[rsum] << 16 ) | ( dv[gsum] << 8 ) | dv[bsum];

                rsum -= routsum;
                gsum -= goutsum;
                bsum -= boutsum;

                stackstart = stackpointer - radius + div;
                sir = stack[stackstart % div];

                routsum -= sir[0];
                goutsum -= sir[1];
                boutsum -= sir[2];

                if (x == 0) {
                    vmin[y] = Math.min(y + r1, hm) * w;
                }
                p = x + vmin[y];

                sir[0] = r[p];
                sir[1] = g[p];
                sir[2] = b[p];

                rinsum += sir[0];
                ginsum += sir[1];
                binsum += sir[2];

                rsum += rinsum;
                gsum += ginsum;
                bsum += binsum;

                stackpointer = (stackpointer + 1) % div;
                sir = stack[stackpointer];

                routsum += sir[0];
                goutsum += sir[1];
                boutsum += sir[2];

                rinsum -= sir[0];
                ginsum -= sir[1];
                binsum -= sir[2];

                yi += w;
            }
        }
        bitmap.setPixels(pix, 0, w, 0, 0, w, h);

        return (bitmap);
    }   
    //放大缩小图片    
    public static Bitmap zoomBitmap(Bitmap bitmap,int w,int h){    
        int width = bitmap.getWidth();    
        int height = bitmap.getHeight();    
        Matrix matrix = new Matrix();    
        float scaleWidht = ((float)w / width);    
        float scaleHeight = ((float)h / height);    
        matrix.postScale(scaleWidht, scaleHeight);    
        Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);    
        return newbmp;    
    }    
    //将Drawable转化为Bitmap    
     public static Bitmap drawableToBitmap(Drawable drawable){    
            int width = drawable.getIntrinsicWidth();    
            int height = drawable.getIntrinsicHeight();    
            Bitmap bitmap = Bitmap.createBitmap(width, height,    
                    drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888    
                            : Bitmap.Config.RGB_565);    
            Canvas canvas = new Canvas(bitmap);    
            drawable.setBounds(0,0,width,height);    
            drawable.draw(canvas);    
            return bitmap;    
                
        }    
         
     //获得圆角图片的方法    
    public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPx){    
            
        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap    
                .getHeight(), Config.ARGB_8888);    
        Canvas canvas = new Canvas(output);    
     
        final int color = 0xff424242;    
        final Paint paint = new Paint();    
        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());    
        final RectF rectF = new RectF(rect);    
     
        paint.setAntiAlias(true);    
        canvas.drawARGB(0, 0, 0, 0);    
        paint.setColor(color);    
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);    
     
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));    
        canvas.drawBitmap(bitmap, rect, rect, paint);    
     
        return output;    
    }    
    //获得带倒影的图片方法    
    public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap){    
        final int reflectionGap = 4;    
        int width = bitmap.getWidth();    
        int height = bitmap.getHeight();    
            
        Matrix matrix = new Matrix();    
        matrix.preScale(1, -1);    
            
        Bitmap reflectionImage = Bitmap.createBitmap(bitmap,     
                0, height/2, width, height/2, matrix, false);    
            
        Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height/2), Config.ARGB_8888);    
            
        Canvas canvas = new Canvas(bitmapWithReflection);    
        canvas.drawBitmap(bitmap, 0, 0, null);    
        Paint deafalutPaint = new Paint();    
        canvas.drawRect(0, height,width,height + reflectionGap,    
                deafalutPaint);    
            
        canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);    
            
        Paint paint = new Paint();    
        LinearGradient shader = new LinearGradient(0,    
                bitmap.getHeight(), 0, bitmapWithReflection.getHeight()    
                + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);    
        paint.setShader(shader);    
        // Set the Transfer mode to be porter duff and destination in    
        paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));    
        // Draw a rectangle using the paint with our linear gradient    
        canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()    
                + reflectionGap, paint);    
     
        return bitmapWithReflection;    
    }    
        
}