from GUI_Private.h:580
void GUI__DrawBitmap16bpp (int x0,
int y0,
int xsize,
int ysize,
const U8 * pPixel,
const LCD_LOGPALETTE * pLogPal,
int xMag,
int yMag,
tLCDDEV_Index2Color * pfIndex2Color,
const LCD_API_COLOR_CONV * pColorConvAPI);