convert_wand_to_UIImage.m

- (UIImage *)imageFromWand:(MagickWand *)wand
{
    const char* map = "ARGB";
    NSInteger w = MagickGetImageWidth(wand);
    NSInteger h = MagickGetImageHeight(wand);
    
    NSInteger size = strlen(map) * w * h * sizeof(char);
    
    void* buffer = (void *)malloc(size);
    
    MagickExportImagePixels(wand, 0, 0, w, h, map, CharPixel, buffer);
    
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    
    CGContextRef contextRef =
        CGBitmapContextCreate(buffer,
                              w,
                              h,
                              8,
                              w * strlen(map),
                              colorSpace,
                              kCGImageAlphaPremultipliedFirst);
    
    CGImageRef cgImage = CGBitmapContextCreateImage(contextRef);
    
    UIImage *image = [[UIImage alloc] initWithCGImage:cgImage];
    
    CGImageRelease(cgImage);
    CGContextRelease(contextRef);
    CGColorSpaceRelease(colorSpace);
    
    free(buffer);
    
    return image;
}