Byte Swapping

[Gorecki]

I have a COLORREF DWORD value (0x00bbggrr) that I want to convert to a D3DCOLOR DWORD value (0x00rrggbb). As you can see the 2nd and 4th bytes need to be exchanged.

Any suggestions would be appreciated.

Gorecki

 

[KeithBrautigam]

It probably isn't the cleanest approach, but I think this will work:

// initialize to some value for the sake of this example
COLORREF cr = RGB( 0xAA, 0xBB, 0xCC );

// Swap blue and red
D3DCOLOR d3d = RGB( GetBValue( cr ), GetGValue( cr ), GetRValue( cr ) );

 

[Gorecki]

I figured it out a differnet way but yours should work as well.

//Get RGB Values from bits 0xRRGGBB00
wFromL = LOWORD(cc.rgbResult);
wFromH = HIWORD(cc.rgbResult);
bRed = LOBYTE(wFromL);
bGreen = HIBYTE(wFromL);
bBlue = LOBYTE(wFromH);
// Convert to 0x00RRGGBB
d3dcol = D3DCOLOR_XRGB(bRed,bGreen,bBlue);