I cannot find where Carbon makes code for TPenMode (I need to see why one mode works bad, pmNotXor)

I search TPenMode and find only gtk3 items??

+Search for "TPenMode" in "/home/user/lazarus/lcl/interfaces" (4 matches in 1 files)
</home/user/lazarus/lcl/interfaces>: #4
<gtk3>: #4
<gtk3objects.pas>: #4

                 <(98)>:     FPenMode: TPenMode;
                 <(110)>:     procedure SetPenMode(AValue: TPenMode);
                 <(123)>:     property Mode: TPenMode read FPenMode

write SetPenMode;

                 <(782)>: procedure TGtk3Pen.SetPenMode(AValue: TPenMode);

+Search for "pmNot" in "/home/user/lazarus/lcl/interfaces" (5 matches in 1 files)
</home/user/lazarus/lcl/interfaces>: #5
<gtk3>: #5
<gtk3objects.pas>: #5
<(1005)>: pmNotXor: cairo_set_operator(Widget, CAIRO_OPERATOR_XOR);
<(1007)>: pmNot,
<(1009)>: pmNotCopy,
<(1015)>: pmNotMerge,
<(1017)>: pmNotMask,}

so where widgetsets do it? How to fix pmXor/pmNotXor?

I found it- it is R2_nnnn int values, for each of TPenMode values. Alexey