Function ILAPIENTRY ilClampNTSC

DevIL/src-IL/src/il_manip.cpp:1129–1154

Clamps data values of unsigned bytes from 16 to 235 for display on an NTSC television. Reasoning for this is given at http://msdn.microsoft.com/en-us/library/bb174608.aspx.

//   NTSC television.  Reasoning for this is given at
//   http://msdn.microsoft.com/en-us/library/bb174608.aspx.
ILboolean ILAPIENTRY ilClampNTSC(void)
{
	ILuint x, y, z, c;
	ILuint Offset = 0;

    if (iCurImage == NULL) {
        ilSetError(IL_ILLEGAL_OPERATION);
        return IL_FALSE;
    }

	if (iCurImage->Type != IL_UNSIGNED_BYTE)  // Should we set an error here?
		return IL_FALSE;

	for (z = 0; z < iCurImage->Depth; z++) {
		for (y = 0; y < iCurImage->Height; y++) {
			for (x = 0; x < iCurImage->Width; x++) {
				for (c = 0; c < iCurImage->Bpp; c++) {
					iCurImage->Data[Offset + c] = IL_LIMIT(iCurImage->Data[Offset + c], 16, 235);
				}
			Offset += iCurImage->Bpp;
			}
		}
	}

	return IL_TRUE;
}