== About texvc ==
texvc takes LaTeX-compatible equations and produces formatted output in
-HTML, MathML, and (via LaTeX/dvips/ImageMagick) rasterized PNG images.
+HTML, MathML, and (via LaTeX/dvipng) rasterized PNG images.
Input data is parsed and scrutinized for safety, and the output includes
an estimate of whether the code is simple enough that HTML rendering will
look acceptable.
The makefile requires GNU make.
-Rasterization is done via LaTeX, dvips, and ImageMagick. These need
-to be installed and in the PATH: latex, dvips, convert
+Rasterization is done via LaTeX, dvipng. These need
+to be installed and in the PATH: latex, dvipng
+
+AMS* packages for LaTeX also need to be installed. Without AMS* some
+equations will render correctly while others won't render.
+Most distributions of TeX already contain AMS*.
+In Debian/Ubuntu you need to install tetex-extra.
To work properly with rendering non-ASCII Unicode characters, a
supplemental TeX package is needed (cjk-latex in Debian)
the user account the web server runs under; if you don't control the server,
you may have to make them world-writable.
+If some equations render correctly while others don't, you probably don't have
+AMS* packages for LaTeX installed. Most distributions of TeX come with AMS*.
+In Debian/Ubuntu AMS* is in tetex-extra package.
+To check if that is the problem you can try those two equations:
+ x + y
+ x \implies y
+The first uses only standard LaTeX, while the second uses symbol \implies from AMS*.
+If the first renders, but the second doesn't, you need to install AMS*.
+
== Hacking ==
Before you start hacking on the math package its good to know the workflow,
2. texvc does its magic, which is basically to check for invalid latex code.
3. texvc takes the user input if valid and creates a latex file containing it, see
get_preface in texutil.ml
-4. latex(1) gets called to create a .dvi file, the a .ps file is created from the
- .dvi file using dvips(1), and finally convert(1) creates a .png file from
- the .ps file. See render.ml for this process (commenting out the removal of
+4. dvipng(1) gets called to create a .png file
+ See render.ml for this process (commenting out the removal of
the temporary file is useful for debugging).