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a52418b360
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@7651 a592a061-630c-0410-9148-cb99ea01b6c8
232 lines
6.4 KiB
Bash
232 lines
6.4 KiB
Bash
#! /bin/sh
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# file lyxpreview2bitmap.sh
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# This file is part of LyX, the document processor.
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# Licence details can be found in the file COPYING.
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#
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# author Angus Leeming
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# with much advice from David Kastrup, david.kastrup@t-online.de.
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#
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# Full author contact details are available in file CREDITS
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# This script takes a LaTeX file and generates bitmap image files,
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# one per page.
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# The idea is to use it with preview.sty from the preview-latex project
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# (http://preview-latex.sourceforge.net/) to create small bitmap
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# previews of things like math equations.
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# preview.sty can be obtained from
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# CTAN/macros/latex/contrib/supported/preview.
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# This script takes three arguments:
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# TEXFILE: the name of the .tex file to be converted.
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# SCALEFACTOR: a scale factor, used to ascertain the resolution of the
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# generated image which is then passed to gs.
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# OUTPUTFORMAT: the format of the output bitmap image files.
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# Two formats are recognised: "ppm" and "png".
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# If successful, this script will leave in dir ${DIR}:
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# a (possibly large) number of image files with names like
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# ${BASE}\([0-9]*\).${SUFFIX} where SUFFIX is ppm or png.
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# a file containing info needed by LyX to position the images correctly
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# on the screen.
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# ${BASE}.metrics
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# All other files ${BASE}* will be deleted.
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# A quick note on the choice of OUTPUTFORMAT:
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# In general files in PPM format are 10-100 times larger than the
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# equivalent files in PNG format. Larger files results in longer
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# reading and writing times as well as greater disk usage.
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# However, whilst the Qt image loader can load files in PNG format
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# without difficulty, the xforms image loader cannot. They must first
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# be converted to a loadable format (eg PPM!). Thus, previews will take
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# longer to appear if the xforms loader is used to load snippets in
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# PNG format.
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# You can always experiment by adding a line to your
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# ${LYXUSERDIR}/preferences file
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# \converter lyxpreview ${FORMAT} "lyxpreview2bitmap.sh" ""
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# where ${FORMAT} is either ppm or png.
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# These four programs are used by the script.
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# Adjust their names to suit your setup.
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test -n "$LATEX" || LATEX=latex
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DVIPS=dvips
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GS=gs
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PNMCROP=pnmcrop
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readonly LATEX DVIPS GS PNMCROP
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# Three helper functions.
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FIND_IT ()
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{
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test $# -eq 1 || exit 1
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type $1 > /dev/null || {
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echo "Unable to find \"$1\". Please install."
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exit 1
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}
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}
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BAIL_OUT ()
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{
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test $# -eq 1 && echo $1
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# Remove everything except the original .tex file.
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FILES=`ls ${BASE}* | sed -e "/${BASE}\.tex/d"`
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rm -f ${FILES} texput.log
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echo "Leaving ${BASE}.tex in ${DIR}"
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exit 1
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}
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REQUIRED_VERSION ()
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{
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test $# -eq 1 || exit 1
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echo "We require preview.sty version 0.73 or newer. You're using"
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grep 'Package: preview' $1
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}
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# Preliminary check.
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if [ $# -ne 3 ]; then
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exit 1
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fi
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# We use latex, dvips and gs, so check that they're all there.
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FIND_IT ${LATEX}
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FIND_IT ${DVIPS}
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FIND_IT ${GS}
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# Extract the params from the argument list.
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DIR=`dirname $1`
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BASE=`basename $1 .tex`
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SCALEFACTOR=$2
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if [ "$3" = "ppm" ]; then
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GSDEVICE=pnmraw
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GSSUFFIX=ppm
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elif [ "$3" = "png" ]; then
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GSDEVICE=png16m
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GSSUFFIX=png
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else
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BAIL_OUT "Unrecognised output format ${OUTPUTFORMAT}. \
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Expected either \"ppm\" or \"png\"."
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fi
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# Initialise some variables.
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TEXFILE=${BASE}.tex
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LOGFILE=${BASE}.log
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DVIFILE=${BASE}.dvi
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PSFILE=${BASE}.ps
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METRICSFILE=${BASE}.metrics
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readonly TEXFILE LOGFILE DVIFILE PSFILE METRICSFILE
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# LaTeX -> DVI.
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cd ${DIR}
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${LATEX} ${TEXFILE} ||
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{
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BAIL_OUT "Failed: ${LATEX} ${TEXFILE}"
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}
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# Parse ${LOGFILE} to obtain bounding box info to output to
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# ${METRICSFILE}.
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# This extracts lines starting "Preview: Tightpage" and
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# "Preview: Snippet".
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grep -E 'Preview: [ST]' ${LOGFILE} > ${METRICSFILE} ||
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{
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REQUIRED_VERSION ${LOGFILE}
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BAIL_OUT "Failed: grep -E 'Preview: [ST]' ${LOGFILE}"
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}
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# Parse ${LOGFILE} to obtain ${RESOLUTION} for the gs process to follow.
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# 1. Extract font size from a line like "Preview: Fontsize 20.74pt"
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# Use grep for speed and because it gives an error if the line is
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# not found.
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LINE=`grep 'Preview: Fontsize' ${LOGFILE}` ||
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{
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REQUIRED_VERSION ${LOGFILE}
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BAIL_OUT "Failed: grep 'Preview: Fontsize' ${LOGFILE}"
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}
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# The sed script strips out everything that won't form a decimal number
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# from the line. It bails out after the first match has been made in
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# case there are multiple lines "Preview: Fontsize". (There shouldn't
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# be.)
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# Note: use "" quotes in the echo to preserve newlines.
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LATEXFONT=`echo "${LINE}" | sed 's/[^0-9\.]//g; 1q'`
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# 2. Extract magnification from a line like
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# "Preview: Magnification 2074"
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# If no such line found, default to MAGNIFICATION=1000.
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LINE=`grep 'Preview: Magnification' ${LOGFILE}`
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if LINE=`grep 'Preview: Magnification' ${LOGFILE}`; then
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# Strip out everything that won't form an /integer/.
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MAGNIFICATION=`echo "${LINE}" | sed 's/[^0-9]//g; 1q'`
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else
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MAGNIFICATION=1000
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fi
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# 3. Compute resolution.
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# "bc" allows floating-point arithmetic, unlike "expr" or "dc".
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RESOLUTION=`echo "scale=2; \
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${SCALEFACTOR} * (10/${LATEXFONT}) * (1000/${MAGNIFICATION})" \
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| bc`
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# DVI -> PostScript
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${DVIPS} -o ${PSFILE} ${DVIFILE} ||
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{
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BAIL_OUT "Failed: ${DVIPS} -o ${PSFILE} ${DVIFILE}"
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}
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# PostScript -> Bitmap files
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# Older versions of gs have problems with a large degree of
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# anti-aliasing at high resolutions
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# test expects integer arguments.
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# ${RESOLUTION} may be a float. Truncate it.
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INT_RESOLUTION=`echo "${RESOLUTION} / 1" | bc`
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ALPHA=4
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if [ ${INT_RESOLUTION} -gt 150 ]; then
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ALPHA=2
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fi
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${GS} -q -dNOPAUSE -dBATCH -dSAFER \
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-sDEVICE=${GSDEVICE} -sOutputFile=${BASE}%d.${GSSUFFIX} \
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-dGraphicsAlphaBit=${ALPHA} -dTextAlphaBits=${ALPHA} \
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-r${RESOLUTION} ${PSFILE} ||
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{
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BAIL_OUT "Failed: ${GS} ${PSFILE}"
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}
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# All has been successful, so remove everything except the bitmap files
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# and the metrics file.
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FILES=`ls ${BASE}* | sed -e "/${BASE}.metrics/d" \
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-e "/${BASE}\([0-9]*\).${GSSUFFIX}/d"`
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rm -f ${FILES} texput.log
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# The bitmap files can have large amounts of whitespace to the left and
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# right. This can be cropped if so desired.
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CROP=1
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type ${PNMCROP} > /dev/null || CROP=0
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# There's no point cropping the image if using PNG images. If you want to
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# crop, use PPM.
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# Apparently dvipng will support cropping at some stage in the future...
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if [ ${CROP} -eq 1 -a "${GSDEVICE}" = "pnmraw" ]; then
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for FILE in ${BASE}*.${GSSUFFIX}
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do
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if ${PNMCROP} -left ${FILE} 2> /dev/null |\
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${PNMCROP} -right 2> /dev/null > ${BASE}.tmp; then
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mv ${BASE}.tmp ${FILE}
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else
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rm -f ${BASE}.tmp
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fi
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done
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rm -f ${BASE}.tmp
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fi
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echo "Previews generated!"
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