Capture the raw screen pixels in OSX. Then saves to a file for debugging.

capture.cpp

void captureScreen()
{
    CGImageRef image_ref = CGDisplayCreateImage(CGMainDisplayID());    
    CGDataProviderRef provider = CGImageGetDataProvider(image_ref);
    CFDataRef dataref = CGDataProviderCopyData(provider);
    size_t width, height;
    width = CGImageGetWidth(image_ref);
    height = CGImageGetHeight(image_ref);
    size_t bpp = CGImageGetBitsPerPixel(image_ref) / 8;
    uint8 *pixels = malloc(width * height * bpp);
    memcpy(pixels, CFDataGetBytePtr(dataref), width * height * bpp);
    CFRelease(dataref);
    CGImageRelease(image_ref);
    FILE *stream = fopen("/Users/robert/Desktop/screencap.raw", "w+");
    fwrite(pixels, bpp, width * height, stream);
    fclose(stream);
    free(pixels);
}

Anyone looking to capture part of the screen, replace CGImageRef image_ref = CGDisplayCreateImage(CGMainDisplayID()); with the following:

    CGRect rect = CGRectMake(x, y, width, height);
    CGImageRef image_ref = CGDisplayCreateImageForRect(kCGDirectMainDisplay, rect);

I like your version @kwhat https://github.com/kwhat/libscreencapture/blob/master/src/darwin/screen_capture.c awesome you are making a multi-platform library!!!