On 10/6/2025 10:50 AM, Max Chernoff via ntg-context wrote:
Hi Hans,
On Wed, 2025-03-19 at 03:51 -0600, Max Chernoff wrote:
Using the latest ConTeXt (2025.02.19), negative slants are broken with
compact fonts. Example document:
\definefontfeature[default][default][Slant=-1]
\startTEXpage
Hello, world!
\stopTEXpage
When compiled with "context", I get the error message
tex error > tex error on line 1 in file
./context-negative-slant.tex: Scale factor (-1000) should be in the range 0..100000
[...]
I'm going to use 0 instead of that illegal code value.
but when compiled with "context --nocompactfonts", I get the correct
result.
Negative slants still seem to be broken with the latest (2025.09.25
18:46). Applying the patch at the end of the email seems to fix things,
but it's more of a hack than a real solution since a negative "scale"
doesn't really make much sense.
Thanks,
-- Max
diff --git a/texmf-context/source/luametatex/source/tex/textypes.h
b/texmf-context/source/luametatex/source/tex/textypes.h
index 0fe86eb..c0d3488 100644
--- a/texmf-context/source/luametatex/source/tex/textypes.h
+++ b/texmf-context/source/luametatex/source/tex/textypes.h
@@ -219,7 +219,7 @@ extern halfword tex_badness(
# define min_space_factor 0 /*tex watch out:
|\spacefactor| cannot be zero but the sf code can!*/
# define max_space_factor 0x7FFF /*tex |077777| */
-# define min_scale_factor 0
+# define min_scale_factor -100000
# define max_scale_factor 100000 /*tex for now */
# define default_space_factor 1000
# define space_factor_threshold 2000
@@ -1116,4 +1116,3 @@ typedef enum tex_character_control_codes {
# define has_character_control(a,b) ((a & b) != 0)
# endif
That is indeed somewhat hackish. Actually
\glyphxscale -200 x
\glyphslant -100 x
are catched as they are internal integers that get clipped later on ...
we can either bark or just silently clip to 0 and 100K whichis more
consistent .. as you say, negative values make no sense
Hans
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