Hi, I think that everybody will agree that image rendering in TeXmacs is currently quite broken.
If I understand correctly, an imported image is first converted to eps. (I
think using the scheme conversion methods). Then, when the image is displayed,
src/Plugins/Ghostscript/gs_utilities.cpp
Is called, which is hard coded to use gs with certain parameters. Then, when
the file is exported, the image is again converted, if necessary. I think
TeXmacs should keep the image in the original format, and render it from there.
On printing it might be converted, or not. And, I think that image rendering
should be done in the background so that TeXmacs does not get stuck every time
an image is displayed....
As a temporary remedy, I added a hack...
First of all, calling gs is not hard coded in TeXmacs. Instead an external
script is called. (hard coded in my version ;)
Since we use an external script, we can try different things... maybe use gs
correctly, or some such.
The script I ended up using simply calls gs exactly like TeXmacs originally
did, except that it caches images. So if an image is rendered once in a certain
resolution, the cached version is used, instead. The cache uses
~/.imagecache/[CRC32 of image]/img_404x449_90x90.png
Where 404x449_90x90 are the requested resolutions of the image.
For now, it works nicely for me. Sadly, there isn't really a facility to redraw
an image when something goes wrong, so you might have to erase ~/.imagecache
This whole thing is a horrible hack. But since I work with images that take 20
seconds or more to render (just a simple 50x100 density plot from R, nothing
fancy), and a document will have many of those, scrolling through the document
was really maddening.
Anyway, here is the script and the edits.
The edit to src/Plugins/Ghostscript/gs_utilities.cpp is to replace gs_to_png
with:
----
void
gs_to_png (url image, url png, int w, int h) {
#if defined (__MINGW__) || defined (__MINGW32__)
string cmd= "\"";
cmd << get_env ("TEXMACS_PATH") << string ("\\bin\\gswin32c\" ");
#else
string cmd= "/usr/local/bin/ps_to_png ";
#endif
cmd << " " << as_string (w) << " " << as_string (h) << " ";
int bbw, bbh;
int rw, rh;
gs_image_size (image, bbw, bbh);
rw= (w*72-1)/bbw+1;
rh= (h*72-1)/bbh+1;
cmd << " " << as_string (rw) << " " << as_string (rh) << " ";
cmd << " " << sys_concretize (png) << " ";
cmd << sys_concretize (image);
system (cmd);
}
----
What do you think?
Michael
ps_to_png
Description: Binary data
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