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DDRAW Transparency in 16 bit mode

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on 16 bit rgb mode how can i make bitmap transparent ?? suppose i want to disable the white colour then what should i use ?? here is my code but it isnt working lpBmp=Bitmapimage; DDCOLORKEY key; key.dwColorSpaceLowValue=0;//RGB16BIT(255,255,255); key.dwColorSpaceHighValue=255;//RGB16BIT(255,255,255); lpDDSPrimary->SetColorKey(DDCKEY_SRCBLT,&key); lpDDSPrimary->BltFast(x,y,lpBmp,0,FALSE);

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