#pragma mark -#pragma mark - 缩放处理+ (UIImage *)scaleImage:(UIImage *)image withScale:(float)scale{    UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scale, image.size.height * scale));        [image drawInRect:CGRectMake(0, 0, image.size.width * scale, image.size.height * scale)];    UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();        UIGraphicsEndImageContext();        return scaledImage;}+ (UIImage *)scaleImage:(UIImage *)image toSize:(CGSize)size{    UIGraphicsBeginImageContext(CGSizeMake(size.width, size.height));        [image drawInRect:CGRectMake(0, 0, size.width, size.height)];    UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();        UIGraphicsEndImageContext();        return scaledImage;}#pragma mark -#pragma mark - 马赛克处理static CGContextRef CreateRGBABitmapContext (CGImageRef inImage){    CGContextRef context = NULL;    CGColorSpaceRef colorSpace;    void *bitmapData; //内存空间的指针，该内存空间的大小等于图像使用RGB通道所占用的字节数。    int bitmapByteCount;    int bitmapBytesPerRow;        size_t pixelsWide = CGImageGetWidth(inImage); //获取横向的像素点的个数    size_t pixelsHigh = CGImageGetHeight(inImage);        bitmapBytesPerRow    = (pixelsWide * 4); //每一行的像素点占用的字节数，每个像素点的ARGB四个通道各占8个bit(0-255)的空间    bitmapByteCount    = (bitmapBytesPerRow * pixelsHigh); //计算整张图占用的字节数        colorSpace = CGColorSpaceCreateDeviceRGB();//创建依赖于设备的RGB通道    //分配足够容纳图片字节数的内存空间    bitmapData = malloc( bitmapByteCount );    //创建CoreGraphic的图形上下文，该上下文描述了bitmaData指向的内存空间需要绘制的图像的一些绘制参数    context = CGBitmapContextCreate (bitmapData,                                     pixelsWide,                                     pixelsHigh,                                     8,                                     bitmapBytesPerRow,                                     colorSpace,                                     kCGImageAlphaPremultipliedLast);    //Core Foundation中通过含有Create、Alloc的方法名字创建的指针，需要使用CFRelease()函数释放    CGColorSpaceRelease( colorSpace );    return context;}static unsigned char *RequestImagePixelData(UIImage *inImage){    CGImageRef img = [inImage CGImage];    CGSize size = [inImage size];    //使用上面的函数创建上下文    CGContextRef cgctx = CreateRGBABitmapContext(img);        CGRect rect = {
   {0,0},{size.width, size.height}};    //将目标图像绘制到指定的上下文，实际为上下文内的bitmapData。    CGContextDrawImage(cgctx, rect, img);    unsigned char *data = CGBitmapContextGetData (cgctx);    //释放上面的函数创建的上下文    CGContextRelease(cgctx);    return data;}+ (UIImage *)mosaicImage:(UIImage *)image withLevel:(int)level{    unsigned char *imgPixel = RequestImagePixelData(image);    CGImageRef inImageRef = [image CGImage];    GLuint width = CGImageGetWidth(inImageRef);    GLuint height = CGImageGetHeight(inImageRef);    unsigned char prev[4] = {0};    int bytewidth = width*4;    int i,j;    int val = level;    for(i=0;i