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Rework preview generation to use Jan-��ke Larsson's dvipng.
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@8655 a592a061-630c-0410-9148-cb99ea01b6c8
This commit is contained in:
Angus Leeming
parent
7b511275f6
commit
8be99f7b3b
@ -1,3 +1,9 @@
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2004-04-15 Angus Leeming <leeming@lyx.org>
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* scripts/lyxpreview2bitmap.sh: removed.
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* scripts/lyxpreview2bitmap.py: added. Uses Jan-Åke Larsson's dvipng
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to perform the conversion.
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2004-04-12 Georg Baum <Georg.Baum@post.rwth-aachen.de>
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* configure.m4: merge \viewer and \format. Add editor to \format
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196
lib/scripts/lyxpreview2bitmap.py
Executable file
196
lib/scripts/lyxpreview2bitmap.py
Executable file
@ -0,0 +1,196 @@
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#! /usr/bin/env python
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# file lyxpreview2bitmap.py
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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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# author Angus Leeming
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# with much advice from members of the preview-latex project:
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# David Kastrup, dak@gnu.org and
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# Jan-Åke Larsson, jalar@mai.liu.se.
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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 a collection of
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# png or ppm image files, one per previewed snippet.
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# Pre-requisites:
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# * A latex executable;
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# * preview.sty;
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# * dvipng;
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# * pngtoppm (if outputing ppm format images).
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# preview.sty and dvipng are part of the preview-latex project
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# http://preview-latex.sourceforge.net/
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# preview.sty can alternatively be obtained from
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# CTAN/support/preview-latex/
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# Example usage:
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# lyxpreview2bitmap.py png 0lyxpreview.tex 128 000000 faf0e6
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# This script takes five arguments:
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# FORMAT: either 'png' or 'ppm'. The desired output format.
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# TEXFILE: the name of the .tex file to be converted.
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# DPI: a scale factor, passed to dvipng.
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# FG_COLOR: the foreground color as a hexadecimal string, eg '000000'.
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# BG_COLOR: the background color as a hexadecimal string, eg 'faf0e6'.
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# Decomposing TEXFILE's name as DIR/BASE.tex, this script will,
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# if executed successfully, leave in DIR:
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# * a (possibly large) number of image files with names
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# like BASE[0-9]+.png
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# * a file BASE.metrics, containing info needed by LyX to position
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# the images correctly on the screen.
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import glob, os, re, string, sys
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# Pre-compiled regular expressions.
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hexcolor_re = re.compile("^[0-9a-fA-F]{6}$")
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latex_file_re = re.compile("\.tex$")
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def usage(prog_name):
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return "Usage: %s <latex file> <dpi> <fg color> <bg color>\n"\
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"\twhere the colors are hexadecimal strings, eg 'faf0e6'"\
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% prog_name
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def error(message):
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sys.stderr.write(message + '\n')
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sys.exit(1)
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def find_exe(candidates, path):
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for prog in candidates:
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for directory in path:
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full_path = os.path.join(directory, prog)
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if os.access(full_path, os.X_OK):
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return full_path
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return None
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def find_exe_or_terminate(candidates, path):
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exe = find_exe(candidates, path)
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if exe == None:
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error("Unable to find executable from '%s'" % string.join(candidates))
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return exe
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def run_command(cmd):
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handle = os.popen(cmd, 'r')
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cmd_stdout = handle.read()
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cmd_status = handle.close()
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return cmd_status, cmd_stdout
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def make_texcolor(hexcolor):
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# Test that the input string contains 6 hexadecimal chars.
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if not hexcolor_re.match(hexcolor):
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error("Cannot convert color '%s'" % hexcolor)
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red = float(string.atoi(hexcolor[0:2], 16)) / 255.0
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green = float(string.atoi(hexcolor[2:4], 16)) / 255.0
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blue = float(string.atoi(hexcolor[4:6], 16)) / 255.0
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return "rgb %f %f %f" % (red, green, blue)
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def extract_metrics_info(dvipng_stdout, metrics_file):
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metrics = open(metrics_file, 'w')
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metrics_re = re.compile("\[([0-9]+) depth=([0-9]+) height=([0-9]+)\]")
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success = 0
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pos = 0
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while 1:
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match = metrics_re.search(dvipng_stdout, pos)
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if match == None:
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break
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success = 1
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# Calculate the 'ascent fraction'.
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descent = string.atof(match.group(2))
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ascent = string.atof(match.group(3))
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frac = 0.5
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if abs(ascent + descent) > 0.1:
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frac = ascent / (ascent + descent)
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metrics.write("Snippet %s %f\n" % (match.group(1), frac))
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pos = match.end(3) + 2
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return success
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def convert_to_ppm_format(pngtopnm, basename):
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png_file_re = re.compile("\.png$")
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for png_file in glob.glob("%s*.png" % basename):
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ppm_file = png_file_re.sub(".ppm", png_file)
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p2p_cmd = "%s %s" % (pngtopnm, png_file)
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p2p_status, p2p_stdout = run_command(p2p_cmd)
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if p2p_status != None:
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error("Unable to convert %s to ppm format" % png_file)
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ppm = open(ppm_file, 'w')
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ppm.write(p2p_stdout)
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os.remove(png_file)
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def main(argv):
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# Parse and manipulate the command line arguments.
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if len(argv) != 6:
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error(usage(argv[0]))
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output_format = string.lower(argv[1])
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dir, latex_file = os.path.split(argv[2])
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if len(dir) != 0:
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os.chdir(dir)
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dpi = string.atoi(argv[3])
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fg_color = make_texcolor(argv[4])
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bg_color = make_texcolor(argv[5])
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# External programs used by the script.
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path = string.split(os.getenv("PATH"), os.pathsep)
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latex = find_exe_or_terminate(["pplatex", "latex2e", "latex"], path)
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dvipng = find_exe_or_terminate(["dvipng"], path)
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pngtopnm = ""
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if output_format == "ppm":
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pngtopnm = find_exe_or_terminate(["pngtopnm"], path)
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# Compile the latex file.
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latex_call = "%s %s" % (latex, latex_file)
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latex_status, latex_stdout = run_command(latex_call)
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if latex_status != None:
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error("%s failed to compile %s" \
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% (os.path.basename(latex), latex_file))
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# Run the dvi file through dvipng.
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dvi_file = latex_file_re.sub(".dvi", latex_file)
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dvipng_call = "%s -Ttight -depth -height -D %d -fg '%s' -bg '%s' %s" \
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% (dvipng, dpi, fg_color, bg_color, dvi_file)
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dvipng_status, dvipng_stdout = run_command(dvipng_call)
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if dvipng_status != None:
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error("%s failed to generate images from %s" \
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% (os.path.basename(dvipng), dvi_file))
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# Extract metrics info from dvipng_stdout.
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metrics_file = latex_file_re.sub(".metrics", latex_file)
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if not extract_metrics_info(dvipng_stdout, metrics_file):
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error("Failed to extract metrics info from dvipng")
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# Convert images to ppm format if necessary.
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if output_format == "ppm":
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convert_to_ppm_format(pngtopnm, latex_file_re.sub("", latex_file))
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if __name__ == "__main__":
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main(sys.argv)
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@ -1,231 +0,0 @@
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#! /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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@ -1,3 +1,16 @@
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2004-04-15 Angus Leeming <leeming@lyx.org>
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* PreviewLoader.C (startLoading): change arguments passed to the
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preview-generation script to include the foreground and background
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colours.
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(dumpPreamble): no longer write the foreground and background
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colours to the latex file as PostScript specials.
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(setConverter): consider only those 'to' formats that are
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loadable natively by the GUI library, rather than all formats
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for which a converter exists.
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(setAscentFractions): re-written to parse much simplified metrics
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file.
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2004-04-13 Angus Leeming <leeming@lyx.org>
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* PreviewLoader.C (dumpPreamble):
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@ -12,6 +12,7 @@
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#include "PreviewLoader.h"
|
||||
#include "PreviewImage.h"
|
||||
#include "GraphicsCache.h"
|
||||
|
||||
#include "buffer.h"
|
||||
#include "converter.h"
|
||||
@ -492,10 +493,12 @@ void PreviewLoader::Impl::startLoading()
|
||||
|
||||
// The conversion command.
|
||||
ostringstream cs;
|
||||
cs << pconverter_->command << ' ' << latexfile << ' '
|
||||
<< int(font_scaling_factor_) << ' ' << pconverter_->to;
|
||||
cs << pconverter_->command << ' ' << pconverter_->to << ' '
|
||||
<< latexfile << ' ' << int(font_scaling_factor_) << ' '
|
||||
<< lyx_gui::hexname(LColor::preview) << ' '
|
||||
<< lyx_gui::hexname(LColor::background);
|
||||
|
||||
string const command = "sh " + support::LibScriptSearch(cs.str());
|
||||
string const command = support::LibScriptSearch(cs.str());
|
||||
|
||||
// Initiate the conversion from LaTeX to bitmap images files.
|
||||
support::Forkedcall::SignalTypePtr
|
||||
@ -616,21 +619,8 @@ void PreviewLoader::Impl::dumpPreamble(ostream & os) const
|
||||
// Use the preview style file to ensure that each snippet appears on a
|
||||
// fresh page.
|
||||
os << "\n"
|
||||
<< "\\usepackage[active,delayed,dvips,tightpage,showlabels,lyx]{preview}\n"
|
||||
<< "\\usepackage[active,delayed,dvips,showlabels,lyx]{preview}\n"
|
||||
<< "\n";
|
||||
|
||||
// This piece of PostScript magic ensures that the foreground and
|
||||
// background colors are the same as the LyX screen.
|
||||
string fg = lyx_gui::hexname(LColor::preview);
|
||||
if (fg.empty()) fg = "000000";
|
||||
|
||||
string bg = lyx_gui::hexname(LColor::background);
|
||||
if (bg.empty()) bg = "ffffff";
|
||||
|
||||
os << "\\AtBeginDocument{\\AtBeginDvi{%\n"
|
||||
<< "\\special{!userdict begin/bop-hook{//bop-hook exec\n"
|
||||
<< '<' << fg << bg << ">{255 div}forall setrgbcolor\n"
|
||||
<< "clippath fill setrgbcolor}bind def end}}}\n";
|
||||
}
|
||||
|
||||
|
||||
@ -667,11 +657,14 @@ Converter const * setConverter()
|
||||
{
|
||||
string const from = "lyxpreview";
|
||||
|
||||
Formats::FormatList::const_iterator it = formats.begin();
|
||||
Formats::FormatList::const_iterator end = formats.end();
|
||||
typedef vector<string> FmtList;
|
||||
typedef lyx::graphics::Cache GCache;
|
||||
FmtList const loadableFormats = GCache::get().loadableFormats();
|
||||
FmtList::const_iterator it = loadableFormats.begin();
|
||||
FmtList::const_iterator const end = loadableFormats.end();
|
||||
|
||||
for (; it != end; ++it) {
|
||||
string const to = it->name();
|
||||
string const to = *it;
|
||||
if (from == to)
|
||||
continue;
|
||||
|
||||
@ -712,56 +705,30 @@ void setAscentFractions(vector<double> & ascent_fractions,
|
||||
|
||||
bool error = false;
|
||||
|
||||
// Tightpage dimensions affect all subsequent dimensions
|
||||
int tp_ascent;
|
||||
int tp_descent;
|
||||
int snippet_counter = 1;
|
||||
while (!in.eof() && it != end) {
|
||||
string snippet;
|
||||
int id;
|
||||
double ascent_fraction;
|
||||
|
||||
int snippet_counter = 0;
|
||||
while (!in.eof()) {
|
||||
// Expecting lines of the form
|
||||
// Preview: Tightpage tp_bl_x tp_bl_y tp_tr_x tp_tr_y
|
||||
// Preview: Snippet id ascent descent width
|
||||
string preview;
|
||||
string type;
|
||||
in >> preview >> type;
|
||||
in >> snippet >> id >> ascent_fraction;
|
||||
|
||||
if (!in.good())
|
||||
// eof after all
|
||||
break;
|
||||
|
||||
error = preview != "Preview:"
|
||||
|| (type != "Tightpage" && type != "Snippet");
|
||||
error = snippet != "Snippet";
|
||||
if (error)
|
||||
break;
|
||||
|
||||
if (type == "Tightpage") {
|
||||
int dummy;
|
||||
in >> dummy >> tp_descent >> dummy >> tp_ascent;
|
||||
error = id != snippet_counter;
|
||||
if (error)
|
||||
break;
|
||||
|
||||
error = !in.good();
|
||||
if (error)
|
||||
break;
|
||||
*it = ascent_fraction;
|
||||
|
||||
} else {
|
||||
int dummy;
|
||||
int snippet_id;
|
||||
int ascent;
|
||||
int descent;
|
||||
in >> snippet_id >> ascent >> descent >> dummy;
|
||||
|
||||
error = !in.good() || ++snippet_counter != snippet_id;
|
||||
if (error)
|
||||
break;
|
||||
|
||||
double const a = ascent + tp_ascent;
|
||||
double const d = descent - tp_descent;
|
||||
|
||||
if (!support::float_equal(a + d, 0, 0.1))
|
||||
*it = a / (a + d);
|
||||
|
||||
if (++it == end)
|
||||
break;
|
||||
}
|
||||
++snippet_counter;
|
||||
++it;
|
||||
}
|
||||
|
||||
if (error) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user