Re: Skia-based ot-svg renderer hook to freetype

[Hin-Tak Leung]

Actually Adobe/Mozilla OT-SVG fonts do *not* return EM, EM but something like a few hundred, a few hundred.

The bug fix in freetype2-demos I submitted was that, if it comes out as 1,1, it means EM, EM (1024, 2048 or there abouts).

Search for "memory exhaustion" in the freetype2-demos commit log, as I suggested. It isn't that hard to find.

On Thursday, 6 July 2023 at 06:36:49 GMT+8, Hin-Tak Leung <htl10@users.sourceforge.net> wrote:

It is the result from the "intrinsic dimensions" routine - (there is a routine of that sort of name in both rsvg and skia). It returns some larger numbers, EM,EM I think for Adobe/Mozilla OT-SVG fonts, but 1,1 from rsvg and 0,0 from skia for Google-origin OT-SVG fonts.

Clear enough?

On Wednesday, 5 July 2023 at 22:00:54 GMT+8, Cosimo Lupo <cosimo@anthrotype.com> wrote:

I have no idea what you're talking about. Please, clarify what this difference is supposed to be, otherwise this is just spreading rumors.

On Wed, Jul 5, 2023 at 2:33 PM Hin-Tak Leung <htl10@users.sourceforge.net> wrote:

On Wednesday, 5 July 2023 at 20:49:42 GMT+8, Hin-Tak Leung <htl10@users.sourceforge.net> wrote:

> On Wednesday, 5 July 2023 at 03:24:11 GMT+8, Cosimo Lupo <cosimo@anthrotype.com> wrote:

> > Hin-Tak, what do you mean by "Google OT-SVG fonts"? They're only one OT-SVG format.

> Yes and no. I don't have that many OT-SVG fonts - 3 from Adobe/Mozilla sources, and the rest (more than 2 and less than 10) from Google Fonts. The two sets behave differently, and get processed by two different code paths in freetype2-demos. The Google set triggers the memory exhaustion bug I fixed in freetype2-demos about a month ago; the Adobe/Mozilla set does not.

> That was all part of the activities around the time with the Google font SVG subsetting bug. Look at the freetype2-demo log around the same time you investigated and fixed the subletting bug.

Actually having looked at Skia and skia-python's SVG related functionality last night, Skia also follows two slightly different code paths for the two "types" of OT-SVG fonts. There will be a small "if x else ..." clause separating the two in Skia related code, if /when I finish.