Code off

Welcome to the first annual /prog/ Code off !

The language will be C.

Compeptitors include (in no particular order):

Mr. Ribs
Xarn
FV
Anonymous
W. T. Snacks

Rumor has it, that there may be a special guest appearance from either The Sussman or
Leah Culver.

What's the point of this, you ask?

It's to determine who is an EXPERT PROGRAMMER.

Marking criteria:

Optimization
Elegance

Bonus marks:
indentation

Good luck!

#include <Carbon/Carbon.h>

CGImageRef LoadJPEGImageAtFileSystemPath(const char *path)
{
    CFURLRef url;
    CGDataProviderRef dataProvider;
    CGImageRef image = NULL;
    url = CFURLCreateFromFileSystemRepresentation(kCFAllocatorDefault,
        (const UInt8 *)path, strlen(path), false);
    if (dataProvider = CGDataProviderCreateWithURL(url))
    {
        image = CGImageCreateWithJPEGDataProvider(dataProvider, NULL,
            true, kCGRenderingIntentPerceptual);
        CGDataProviderRelease(dataProvider);
    }
    CFRelease(url);
    return image;
}
void InitializeDisplaySystem()
{
    ProcessSerialNumber psn = {0, kCurrentProcess};
    TransformProcessType(&psn, kProcessTransformToForegroundApplication);
    SetFrontProcess(&psn);
}
WindowRef CreateWindowForImage(CGImageRef image)
{
    Rect bounds;
    size_t width, height;
    WindowRef window;
    GetAvailableWindowPositioningBounds(NULL, &bounds);
    width = CGImageGetWidth(image);
    height = CGImageGetHeight(image);
    if (bounds.right - bounds.left > width)
    {
        bounds.left = (bounds.left + bounds.right - width) / 2;
        bounds.right = bounds.left + width;
    }
    if (bounds.bottom - bounds.top > height)
    {
        bounds.top = (bounds.top + bounds.bottom - height) / 2;
        bounds.bottom = bounds.top + height;
    }
    CreateNewWindow(kPlainWindowClass, kWindowNoAttributes, &bounds,
        &window);
    return window;
}
void RenderTwoImagesBlendedTogetherIntoWindow(WindowRef window,
    CGImageRef firstImage, CGImageRef secondImage)
{
    CGContextRef context;
    CGRect drawArea = CGRectMake(0, 0, CGImageGetWidth(firstImage),
        CGImageGetHeight(firstImage));
    QDBeginCGContext(GetWindowPort(window), &context);
    CGContextSaveGState(context);
    CGContextDrawImage(context, drawArea, firstImage);
    CGContextSetAlpha(context, 0.5);
    CGContextDrawImage(context, drawArea, secondImage);
    CGContextRestoreGState(context);
    QDEndCGContext(GetWindowPort(window), &context);
}
OSStatus HandleExitEvent(EventHandlerCallRef inHandlerCallRef,
    EventRef inEvent, void *inUserData)
{
    QuitApplicationEventLoop();
    return noErr;
}
void DoEventLoop(WindowRef window)
{
    EventTypeSpec exitEvents[2] = {
        {kEventClassKeyboard, kEventRawKeyDown},
        {kEventClassMouse, kEventMouseDown}
    };
    InstallWindowEventHandler(window, HandleExitEvent, 2, exitEvents,
        NULL, NULL);
    RunApplicationEventLoop();
}
int main(int argc, char *argv[])
{
    CGImageRef image1, image2;
    WindowRef window;
    if (argc != 3) errx(1, "U MENA ARGS?");
    image1 = LoadJPEGImageAtFileSystemPath(argv[1]);
    image2 = LoadJPEGImageAtFileSystemPath(argv[2]);
    if (!image1 || !image2) errx(2, "images no load");
    InitializeDisplaySystem();
    window = CreateWindowForImage(image1);
    ShowWindow(window);
    RenderTwoImagesBlendedTogetherIntoWindow(window, image1, image2);
    DoEventLoop(window);
    return 0;
}