[SDL] Small Blit program won't run unless breakpoint set (Mac/XCode)

[Michael Ryan Bannon]

Hello,

In the attempts to make an example for another problem I was having, I 
started to put together a code sample.  But, naturally, I can't get the code 
sample to work.

The following is the beginning of my sample.  Two problems: first, it only 
works if I set a breakpoint early in the "main" and second, the alpha calls 
aren't doing anything.

==========================================
#include <Carbon/Carbon.h>
#include <SDL/SDL.h>
#include <SDL_image/SDL_image.h>

void GetPixelData(void** aData, int* aSize, const char* aPath)
{
    // Get file ref.
    FSRef fileRef;
    FSPathMakeRef((const UInt8*)(aPath), &fileRef, NULL);

    // Get catalog info and data fork name (which is nothing).
    FSCatalogInfo catalogInfo;
    FSGetCatalogInfo(&fileRef, kFSCatInfoDataSizes, &catalogInfo, NULL, 
NULL, NULL);
    HFSUniStr255 dataForkName;
    FSGetDataForkName(&dataForkName);

    // Open data fork.
    SInt16 dataForkNumber = -1;
    OSStatus error = FSOpenFork(&fileRef, dataForkName.length, 
dataForkName.unicode, fsCurPerm, &dataForkNumber);

    // Get position of fork.
    SInt64 position = -1;
    error = FSGetForkPosition(dataForkNumber, &position);

    // Set size.
    *aSize = catalogInfo.dataLogicalSize;

    // Read the fork.
    ByteCount actualCount;
    *aData = new char[*aSize];
    error = FSReadFork(dataForkNumber, fsFromStart, position, *aSize, 
(void*)(*aData), &actualCount);

    // Close the fork.
    FSCloseFork(dataForkNumber);
}


int main(int argc, char*argv[])
{
 // Initialize SDL with the given driverName.  This driver is specified by 
setting the
 // environment variable, "SDL_VIDEODRIVER" to driverName.
    int error = SDL_Init(SDL_INIT_VIDEO);
 SDL_putenv("SDL_VIDEODRIVER=Quartz");

    // Create window and display surface.
 SDL_Surface* pDisplaySurface = SDL_SetVideoMode(800, 600, 32, 
SDL_SWSURFACE);
    pDisplaySurface->format->Amask = 0;

    // Get pixel data.
    void* pPixelDataOne;
    int sizePixelDataOne = 0;
    GetPixelData(&pPixelDataOne, &sizePixelDataOne, "/1.jpg");

    // Create surfaces.
 SDL_RWops *rwOne = SDL_RWFromMem(pPixelDataOne, sizePixelDataOne);
 SDL_Surface *pSurfaceOne = IMG_Load_RW(rwOne, 0);

    // Display
    int alpha = 0;
    while(true)
    {
        alpha += 10;
        if(alpha > 255)
        {
            alpha = 0;
        }
        pSurfaceOne->format->Amask = 0;
        SDL_SetAlpha(pSurfaceOne, SDL_SRCALPHA, alpha);
        SDL_BlitSurface(pSurfaceOne, NULL, pDisplaySurface, NULL);
    }

    return 0;
}
==========================================

Please note that I'm using XCode 2.3 on Mac OS 10.4.6.  The SDL frameworks 
are universal binary (as is my project).  The code is experiencing problems 
with both the PPC and i386.  Also I just stuck my jpg resource (1.jpg) in 
the volume root...I'm lazy.

Thanks,

Ryan

ps - I now it sounds stupid that I couldn't make a simple sample even though 
I had an already working bigger SDL project, but I'm working on a port...so 
it wasn't originally my code :)