On Sun, 15 Feb 2015 07:47:59 +0100 (CET), Werner LEMBERG wrote:
I know FreeType can’t handle non-affine transformations—presumably
that is by design. But you could do what PostScript did, and have a
3×2 matrix that can only express affine transformations.
Shifting glyphs is *much* more
Shifting glyphs is *much* more common than rotating or shearing.
I guess one issue is that rotating and shearing will disable
hinting?
Yes.
But scaling will not, and that comes from the same matrix, doesn’t
it?
Scaling itself doesn't disable hinting, however, it gets applied
*after*
I’ve been wondering why FreeType uses only 2×2 matrices, so it has to
express translations with a separate vector. It is common in
graphics libraries to use homogeneous matrices (3×3 for 2D, 4×4 for 3D)
so all linear transformations can be encapsulated in a single matrix.
I know FreeType can’t
On Sun, 15 Feb 2015 07:47:59 +0100 (CET), Werner LEMBERG wrote:
Shifting glyphs is *much* more common than rotating or shearing.
Couple of points that occur to me:
* Shearing is often used to simulate italic.
* When you do want to bring in the other operations, being able to
combine them
* Shearing is often used to simulate italic.
Yes. In this special case, hinting along the vertical axis (which
happens before shearing) doesn't harm.
Werner
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