bitmap(0, 0) = ff6e90be
png(0, 0) = ff6e90be
sdlbmp(0, 0) = 6e90be

bitmap(31, 0) = ff6e90be
png(31, 0) = ff6e90be
sdlbmp(31, 0) = 6e90be

NOTE: ff6e90be = R(110) G(144) B(190)

bitmap->format->Rmask ff0000
png->format->Rmask ff0000
sdlbmp->format->Rmask ff0000

bitmap->format->Gmask ff00
png->format->Gmask ff00
sdlbmp->format->Gmask ff00

bitmap->format->Rshift 10
png->format->Rshift 10
sdlbmp->format->Rshift 10

bitmap->format->Gshift 8
png->format->Gshift 8
sdlbmp->format->Gshift 8