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What does the SetColorKey function return? You need to check this. If it doesn't return DD_OK, you've got a problem. If would suggestion logging every function's return value somewhere to aid in your debugging.
What does your blitting code look like? I'm assuming you're using the DDBLT_KEYSRC flag in your Blt function call.
A little more info might help us in helping you.
=============================================
DDInit SUCCESS // sets up everything. screen width,height and bpp are #defines
DDCreateSurface SUCCESS // creates the lpddsring surface
DDSetColorKey SUCCESS // sets the RGB(250,0,218) into lpddsring surface
DDReLoadBitmap SUCCESS // loads the .dib into the lpddsring surface
=============================================
I made my .dib in PaintShopPro and it saves the .dib as 24bit, which doesn't seem to have any effect when displaying on a 16bit surface (cause the picture comes up fine...). Here's what my BltSurface functions looks like (i overloaded it):
=============================================
int BltSurface(LPDIRECTDRAWSURFACE7 lpdds, RECT dest, RECT source)
{
if(lpddsback->Blt(&dest,lpdds,&source,DDBLT_WAIT | DDBLT_KEYSRC,NULL)!=DD_OK)
return 0;
// everything ok
return 1;
}
/////////////////////////////////////////////
int BltSurface(LPDIRECTDRAWSURFACE7 source, int w, int h, int x, int y)
{
// w = width, h = height, x and y are where on the screen
RECT rcRect;
rcRect.left = 0;
rcRect.top = 0;
rcRect.right = w;
rcRect.bottom = h;
if(lpddsback->BltFast(x,y,source,&rcRect,DDBLTFAST_SRCCOLORKEY)!=DD_OK)
return 0;
return 1;
}
=============================================
I tried both functions, also by commenting the one that i wasn't testing, but neither seems to skip that color i chose. I wonder if it's the way PaintShopPro5 saves the RGB components...?
I'd put the .dib/.bmp file up here so you could test it out if you wanted to, if i knew how. Of course, i'd save it as .jpg first 
1) Converting from 24-bit to 16-bit will loose color precision. I.e. your color mask may end up beeing slightly different from what you intended. Use a color like pure blue instead (0,0,255)....
2) Jpeg is NOT a good idea when using color keying due to color distortion (I.e. posting a JPEG for people to test with will not give any good results )
/Niels
DDSetColorKey(lpddsring,RGB16(240,0,218));
I hope it doesn't build an RGB565 color! Even though your surface is 16 bit, you must pass a 24 bit color to DDSetColorKey. Use the standard RGB macro instead. Look at DDUtil.cpp to see why.
On the other hand, when you use SetColorKey, you would pass it an RGB565 color. Stupid isn't it?
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Visit the homepage of my (soon to be 'net multiplayer) Tank Game at http://members.home.net/chris-man
I'm currently creating a ddraw library, and i've run into a problem that i haven't figured out to fix (I'm using DirectX7 btw). I've made a program to make sure my library is working correctly.
The program currently sets up directdraw,creates a surface to hold a bitmap,loads the bitmap, sets the colorkey, blts the surface into lpddsback, and then flips.
I made RGB(250,0,218) as my colorkey in PaintShopPro5, and set up the color key like this:
DDSetColorKey(lpddsring,RGB16(240,0,218));
// lpddsring being the surface holding the .bmp, er .dib (i've tried both extensions)
Anyway, when i run it, i can still see the pink around the picture (a ring of fire). I even tried this setting:
DDSetColorKey(lpddsring,CLR_INVALID)
but still no success (and yes, the pink is in coord (0,0)). The blt function uses the DDBLT_KEYSRC flag too...
Can anyone help me out here?
Well, thanks for the help guys hehe =).
