ImageUtils.java 文件源码

/**
 * 添加倒影
 *
 * @param src 源图片的
 * @param reflectionHeight 倒影高度
 * @param recycle 是否回收
 * @return 带倒影图片
 */
public static Bitmap addReflection(Bitmap src, int reflectionHeight, boolean recycle) {
    if (isEmptyBitmap(src)) {
        return null;
    }
    // 原图与倒影之间的间距
    final int REFLECTION_GAP = 0;
    int srcWidth = src.getWidth();
    int srcHeight = src.getHeight();
    Matrix matrix = new Matrix();
    matrix.preScale(1, -1);
    Bitmap reflectionBitmap = Bitmap.createBitmap(src, 0, srcHeight -
            reflectionHeight, srcWidth, reflectionHeight, matrix, false);
    Bitmap ret = Bitmap.createBitmap(srcWidth,
            srcHeight + reflectionHeight, src.getConfig());
    Canvas canvas = new Canvas(ret);
    canvas.drawBitmap(src, 0, 0, null);
    canvas.drawBitmap(reflectionBitmap, 0,
            srcHeight + REFLECTION_GAP, null);
    Paint paint = new Paint();
    paint.setAntiAlias(true);
    LinearGradient shader = new LinearGradient(0, srcHeight, 0,
            ret.getHeight() +
                    REFLECTION_GAP, 0x70FFFFFF, 0x00FFFFFF, Shader.TileMode.MIRROR);
    paint.setShader(shader);
    paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.DST_IN));
    canvas.drawRect(0,
            srcHeight + REFLECTION_GAP, srcWidth, ret.getHeight(), paint);
    if (!reflectionBitmap.isRecycled()) {
        reflectionBitmap.recycle();
    }
    if (recycle && !src.isRecycled()) {
        src.recycle();
    }
    return ret;
}