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

[Michael Ryan Bannon]

Sorry...I was not doing an SDL_UpdateRect on the display surface.  The jpeg 
appears each time, but the alpha calls that I'm doing still don't seem to be 
working.

"Michael Ryan Bannon" <ryan.bannon at humagade.com> wrote in message 
news:e8b8ck$olg$1 at sea.gmane.org...
> 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 :)