android 图片处理之制作圆角图片

以下是改进一个前人做的圆角图片的例子，少创建一次bitmap
public static Bitmap roundCorners(final Bitmap source, final float radius) {
        int width = source.getWidth();
        int height = source.getHeight();
 
        Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setColor(android.graphics.Color.WHITE);
 
        Bitmap clipped = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(clipped);
        canvas.drawRoundRect(new RectF(0, 0, width, height), radius, radius,
                paint);
        
        paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(source, 0, 0, paint);
        
        source.recycle();
 
        return clipped;
    }
 
 
原例：
    /**
     * Round the corners of a {@link Bitmap}
     *
     * @param source
     * @param radius
     * @return rounded corner bitmap
     */
    public static Bitmap roundCorners(final Bitmap source, final float radius) {
        int width = source.getWidth();
        int height = source.getHeight();
 
        Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setColor(WHITE);
 
        Bitmap clipped = Bitmap.createBitmap(width, height, ARGB_8888);
        Canvas canvas = new Canvas(clipped);
        canvas.drawRoundRect(new RectF(0, 0, width, height), radius, radius,
                paint);
        paint.setXfermode(new PorterDuffXfermode(DST_IN));
 
        Bitmap rounded = Bitmap.createBitmap(width, height, ARGB_8888);
        canvas = new Canvas(rounded);
        canvas.drawBitmap(source, 0, 0, null);
        canvas.drawBitmap(clipped, 0, 0, paint);
 
        source.recycle();
        clipped.recycle();
 
        return rounded;
    }
 

补充：移动开发 , Android ,

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