圆角处理图片

作者: 小慕汐 | 来源:发表于2018-08-28 16:04 被阅读9次

public class DrawableUtils {
    
    /**
    * 将图片的四角圆弧化
    *
    * @param bitmap      原图
    * @param roundPixels 弧度
    * @return
    */
    public static Bitmap getRoundCornerImage(Bitmap bitmap, int roundPixels, int roundType) {
       int    width           = bitmap.getWidth();
       int    height          = bitmap.getHeight();
       Path   path            = checkRect(width, height, roundPixels, roundType);
       Bitmap roundRoundImage = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
       Canvas canvas          = new Canvas(roundRoundImage);
       Paint  paint           = new Paint();
       paint.setAntiAlias(true);// 抗锯齿
       paint.setFilterBitmap(true);// 抗锯齿
       
       paint.setColor(0xFF000000);
       canvas.drawPath(path, paint);
       paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));//设置相交模式
       
       canvas.drawBitmap(bitmap, 0, 0, paint);
       return roundRoundImage;
    }
    
    public static Path checkRect(int width, int height, int roundPixels, int roundType) {
       Path  path = new Path();
       RectF rect = new RectF(0, 0, width, height);
       path.addRoundRect(rect, roundPixels, roundPixels, Path.Direction.CCW);
       if ((roundType & ROUND_LEFT_TOP) == 0) {
          path.addRect(0, 0, roundPixels, roundPixels, Path.Direction.CCW);
       }
       if ((roundType & ROUND_RIGHT_TOP) == 0) {
          path.addRect(width - roundPixels, 0, width, roundPixels, Path.Direction.CCW);
       }
       if ((roundType & ROUND_LEFT_BOTTOM) == 0) {
          path.addRect(0, height - roundPixels, roundPixels, height, Path.Direction.CCW);
       }
       if ((roundType & ROUND_RIGHT_BOTTOM) == 0) {
          path.addRect(width - roundPixels, height - roundPixels, width, height, Path.Direction.CCW);
       }
       return path;
    }
    
    public static final int ROUND_LEFT_TOP     = 8;
    public static final int ROUND_RIGHT_TOP    = 4;
    public static final int ROUND_LEFT_BOTTOM  = 2;
    public static final int ROUND_RIGHT_BOTTOM = 1;
}

用int的低位来表示各种状态：