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List:       freetype-devel
Subject:    Re: FreeType INSTCTRL behavior (Po Lu)
From:       Alexei Podtelezhnikov <apodtele () gmail ! com>
Date:       2023-02-13 22:43:37
Message-ID: CAJU=AjXXk=4sVuiZDGq0A-cmnXR62CRM2TkhFamw9y+BTyUa1g () mail ! gmail ! com
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> /* UNDOCUMENTED!  The MS rasterizer doesn't allow the following */
> /* graphics state variables to be modified by the CVT program.  */

On Mon, Feb 13, 2023 at 3:50 PM Hin-Tak Leung
<htl10@users.sourceforge.net> wrote:
> I think it is probably mis-documented - the projection vector and rp1 are not even \
> per-glyph/contour parameter, but per contour fragment....

It does say that "Some [not all] state variables can be reset in the
CVT Program." (1)
Then it says that "instructions intended to move points within a
particular glyph outline cannot be used in the CV Program." (2)
I suppose you can figure out that projection vectors and references
are *intended to move points*. It could be clarified.

(1) https://learn.microsoft.com/en-us/typography/opentype/spec/tt_graphics_state
(2) https://learn.microsoft.com/en-us/typography/opentype/spec/prep


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