Function GetBitsFromMask

DevIL/src-IL/src/il_dds.cpp:1870–1894

@TODO: Look at using the BSF/BSR operands for inline ASM here.

// @TODO:  Look at using the BSF/BSR operands for inline ASM here.
void GetBitsFromMask(ILuint Mask, ILuint *ShiftLeft, ILuint *ShiftRight)
{
	ILuint Temp, i;

	if (Mask == 0) {
		*ShiftLeft = *ShiftRight = 0;
		return;
	}

	Temp = Mask;
	for (i = 0; i < 32; i++, Temp >>= 1) {
		if (Temp & 1)
			break;
	}
	*ShiftRight = i;

	// Temp is preserved, so use it again:
	for (i = 0; i < 8; i++, Temp >>= 1) {
		if (!(Temp & 1))
			break;
	}
	*ShiftLeft = 8 - i;

	return;
}


//