ImageHelper.java 文件源码

public static Bitmap getRoundedCornerAndLightenBitmap(Bitmap bitmap, int cornerRadiusInPixels, boolean captureCircle) {
    Bitmap output = Bitmap.createBitmap(
            bitmap.getWidth(),
            bitmap.getHeight(),
            Bitmap.Config.ARGB_4444);
    Canvas canvas = new Canvas(output);

    final int color = 0xffffffff;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0,
            0,
            bitmap.getWidth(),
            bitmap.getHeight());
    final RectF rectF = new RectF(rect);
    final float roundPx = cornerRadiusInPixels;

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    if (captureCircle) {
        canvas.drawCircle(rectF.centerX(),
                rectF.centerY(),
                bitmap.getWidth() / 2,
                paint);
    } else {
        canvas.drawRoundRect(rectF,
                roundPx,
                roundPx,
                paint);
    }

    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    ColorFilter filter = new LightingColorFilter(0xFFFFFFFF, 0x00222222); // lighten
    //ColorFilter filter = new LightingColorFilter(0xFF7F7F7F, 0x00000000);    // darken
    paint.setColorFilter(filter);
    canvas.drawBitmap(bitmap, rect, rect, paint);

    return output;
}