Incorrect rendering of * with UTF math fonts
Hi, Using * in superscripts gives wrong glyph size and spacing. For example, with LM math everyhing looks fine: \starttext $x^*$ vs $x^{\ast}$ \stoptext With Cambria, the result is OK (but you can still see the differences in the spacing of * in x^*) \usemodule[simplefonts] \setmathfont[Cambria] \starttext $x^*$ vs $x^{\ast}$ \stoptext With Neo Euler, $x^*$ look really bad. \usemodule[simplefonts] \setmathfont[Cambria] \starttext $x^*$ vs $x^{\ast}$ \stoptext I cannot figure out why this is happening. It definitely looks like a bug at the context end rather than a bug with the fonts. Aditya
Hi Aditya, I tried your code: as you say with LM there is no problem, but with the simplefonts module nothing i stypeset since I get an error message: <to be read again> \3>simplefonts:1-12pt-mm-mr--3 \font_helpers_preset_math_family_indeed ...csname \scriptfont #1\csname \??f... \font_helpers_set_math_family ...amily_indeed #1#2 \else \font_helpers_set_ma... \font_helpers_bidirectional_mathstrategy_nop ...r \textfont \c_font_fam_mr_r... <inserted text> ...bidirectional_mathstrategy_nop \fi \font_helpers_apply_co... \font_helpers_synchronize_math ...math_strategies \fi ... This is with ConTeXt ver: 2012.02.21 00:51 MKIV. Best regards: OK On 22 févr. 2012, at 20:52, Aditya Mahajan wrote:
Hi,
Using * in superscripts gives wrong glyph size and spacing.
For example, with LM math everyhing looks fine:
\starttext $x^*$ vs $x^{\ast}$ \stoptext
With Cambria, the result is OK (but you can still see the differences in the spacing of * in x^*)
\usemodule[simplefonts] \setmathfont[Cambria] \starttext $x^*$ vs $x^{\ast}$ \stoptext
With Neo Euler, $x^*$ look really bad.
\usemodule[simplefonts] \setmathfont[Cambria] \starttext $x^*$ vs $x^{\ast}$ \stoptext
I cannot figure out why this is happening. It definitely looks like a bug at the context end rather than a bug with the fonts.
Aditya
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Yes, I have it in /Library/Fonts/Microsoft/Cambria.ttf Maybe is it the wrong version? In my test files I have other instances where Cambria is used and correctly typeset, but with the new versions they don't typeset anymore. Best regards: OK On 22 févr. 2012, at 21:47, Wolfgang Schuster wrote:
Am 22.02.2012 um 21:31 schrieb Otared Kavian:
Hi Aditya,
I tried your code: as you say with LM there is no problem, but with the simplefonts module nothing i stypeset since I get an error message:
Do you have Cambria?
Wolfgang ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!
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Am 22.02.2012 um 22:28 schrieb Otared Kavian:
Yes, I have it in /Library/Fonts/Microsoft/Cambria.ttf Maybe is it the wrong version?
For math you need “Cambria Math.ttf” or “Cambria.ttc”.
In my test files I have other instances where Cambria is used and correctly typeset, but with the new versions they don't typeset anymore.
Cambria works for me: \usemodule[simplefonts] \setmainfont[Cambria] \setmathfont[Cambria] \starttext \input knuth \startformula 1 + 1 = 2 \stopformula \stoptext Wolfgang
On Wed, Feb 22, 2012 at 02:52:22PM -0500, Aditya Mahajan wrote:
Hi,
Using * in superscripts gives wrong glyph size and spacing.
For example, with LM math everyhing looks fine:
\starttext $x^*$ vs $x^{\ast}$ \stoptext
For me this is typeset using LM Type1 fonts, not the OpenType LM math font which explains why both are correct, after adding \setupbodyfont[modern] the first * is raised than the other but still readable.
With Cambria, the result is OK (but you can still see the differences in the spacing of * in x^*)
\usemodule[simplefonts] \setmathfont[Cambria] \starttext $x^*$ vs $x^{\ast}$ \stoptext
With Neo Euler, $x^*$ look really bad.
\usemodule[simplefonts] \setmathfont[Cambria] \starttext $x^*$ vs $x^{\ast}$ \stoptext
I cannot figure out why this is happening. It definitely looks like a bug at the context end rather than a bug with the fonts.
It seems that * in math mode should map to U+2217 (which is what \ast maps to) and not the ASCII asterisk. Regards, Khaled
On Wed, 22 Feb 2012, Khaled Hosny wrote:
On Wed, Feb 22, 2012 at 02:52:22PM -0500, Aditya Mahajan wrote:
Hi,
Using * in superscripts gives wrong glyph size and spacing.
For example, with LM math everyhing looks fine:
\starttext $x^*$ vs $x^{\ast}$ \stoptext
For me this is typeset using LM Type1 fonts, not the OpenType LM math font which explains why both are correct, after adding \setupbodyfont[modern] the first * is raised than the other but still readable.
With Cambria, the result is OK (but you can still see the differences in the spacing of * in x^*)
\usemodule[simplefonts] \setmathfont[Cambria] \starttext $x^*$ vs $x^{\ast}$ \stoptext
With Neo Euler, $x^*$ look really bad.
\usemodule[simplefonts] \setmathfont[Cambria] \starttext $x^*$ vs $x^{\ast}$ \stoptext
I cannot figure out why this is happening. It definitely looks like a bug at the context end rather than a bug with the fonts.
It seems that * in math mode should map to U+2217 (which is what \ast maps to) and not the ASCII asterisk.
Indeed. Making this change gives the correct result. @Hans, can you make the following change in char-def.lua --- char-def.old 2012-02-22 17:18:05.000000000 -0500 +++ char-def.lua 2012-02-22 17:19:06.000000000 -0500 @@ -382,8 +382,7 @@ description="ASTERISK", direction="on", linebreak="al", - mathclass="binary", - mathname="ast", + mathsymbol=0x2217, unicodeslot=0x002A, }, { Aditya
participants (4)
-
Aditya Mahajan -
Khaled Hosny -
Otared Kavian -
Wolfgang Schuster