24bit to 16bit??Q

dream

????:
??????:
????24bit?bmp?n???6bit?bmp?n, ????r??:
????data structure
????BITMAP_FILE, ????BITMAP_IMAGE, ?????:
XXXX24_TAG
{
   int xxx,
   int yyy,
   BYTE *buffer;  //????bmp???image data---24bit, 3?8bit
}
xxxx16_TAG
{
   int xxx,
   int yyy,
   WORD *buffer;  //?????????, ?????6bit?image data, 1?16bit
}

????24bit????6bit??,  ??????16bit?????, ??16bit???????dd surface??D, ??????, ????r?s????, ??xc0000005, ?de_bug?y?, ?????4bit?Q??6bit, ???6bit?????16bit????r??, ?????4bit??Q??6bit???????surface, ?s?]?????, ???r???!! ??????bit, ???bit???Q????...
???????????, ??????????4bit?.bmp?Q??6bit, ????????????, ??????????????,
????????!!!!!!  [em20]

sea_bug

????????????24bit?????16bit?????(565?555)?????????24bit???16bit?

dream

???565???, ?24bit??16bit?]????, ???????D?Q???16bit?????data structure??????, ????????????????
????ode:
dest_ptr   = (WORD*)image->buffer;//16bit???????member                               
WORD buffer=0; //buffer store the 16bit data                               
for(int index_y = 0; index_y < bitmap->bitmapinfoheader.biHeight; index_y++)                //copy the source to dest, line by line
{
for(int index_x = 0; index_x < bitmap->bitmapinfoheader.biWidth; index_x++)
{
                       
UCHAR blue        =(bitmap->buffer[index_y*bitmap->bitmapinfoheader.biHeight*3 + index_x*3+0])>>3;
UCHAR green        =(bitmap->buffer[index_y*bitmap->bitmapinfoheader.biHeight*3 + index_x*3+1])>>3;
UCHAR red        =(bitmap->buffer[index_y*bitmap->bitmapinfoheader.biHeight*3 + index_x*3+2])>>3;

buffer = _RGB16BIT565(red, green, blue);
                       
dest_ptr[index_x + (index_y * (image->width))] = buffer;
}

dancer

0xc0000005??????????????????