BGRA与BGR的相互转换

BGRA转BGR
void BgraToBgr(BYTE *bgraData,int *bgraSize)
{
    for(int i=0,j=0; j<*bgraSize; i+=3,j+=4)
    {
        *(bgraData+i) = *(bgraData+j);
        *(bgraData+i+1) = *(bgraData+j+1);
        *(bgraData+i+2) = *(bgraData+j+2);
    }
    *bgraSize = *bgraSize/4*3;
}
 
BGR转BGRA
void BgrToBgra(BYTE **bgrData,int *bgrSize)
{
    int bgraSize = *bgrSize/3*4;
    BYTE *bgraData = new BYTE[bgraSize];
    for(int i=0, j=0; j < bgraSize; i+=3, j+=4)
    {
        *(bgraData+j) = *(*bgrData+i);
        *(bgraData+j+1) = *(*bgrData+i+1);
        *(bgraData+j+2) = *(*bgrData+i+2);
        *(bgraData+j+3) = 0;
    }
    free(*bgrData);
    *bgrData = bgraData;
    *bgrSize = bgraSize;
}