lyx_mirror/lib/scripts/legacy_lyxpreview2ppm.py

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# -*- coding: utf-8 -*-
# file legacy_lyxpreview2ppm.py
# This file is part of LyX, the document processor.
# Licence details can be found in the file COPYING.
# author Angus Leeming
# Full author contact details are available in file CREDITS
# with much advice from members of the preview-latex project:
# David Kastrup, dak@gnu.org and
# Jan-Åke Larsson, jalar@mai.liu.se.
# and with much help testing the code under Windows from
# Paul A. Rubin, rubin@msu.edu.
# This script takes a LaTeX file and generates a collection of
# png or ppm image files, one per previewed snippet.
# Example usage:
# legacy_lyxpreview2bitmap.py 0lyxpreview.tex 128 ppm 000000 faf0e6
# This script takes five arguments:
# TEXFILE: the name of the .tex file to be converted.
# SCALEFACTOR: a scale factor, used to ascertain the resolution of the
# generated image which is then passed to gs.
# OUTPUTFORMAT: the format of the output bitmap image files.
# This particular script can produce only "ppm" format output.
# FG_COLOR: the foreground color as a hexadecimal string, eg '000000'.
# BG_COLOR: the background color as a hexadecimal string, eg 'faf0e6'.
# Decomposing TEXFILE's name as DIR/BASE.tex, this script will,
# if executed successfully, leave in DIR:
# * a (possibly large) number of image files with names
# like BASE[0-9]+.(ppm|png)
# * a file BASE.metrics, containing info needed by LyX to position
# the images correctly on the screen.
# The script uses several external programs and files:
# * python 2.4 or later (subprocess module);
# * A latex executable;
# * preview.sty;
# * dvips;
# * gs;
# * pdflatex (optional);
# * pnmcrop (optional).
# preview.sty is part of the preview-latex project
# http://preview-latex.sourceforge.net/
# Alternatively, it can be obtained from
# CTAN/support/preview-latex/
# What does this script do?
# [legacy_conversion]
# 0) Process command-line arguments
# [legacy_conversion_step1]
# 1) Call latex to create a DVI file from LaTeX
# [legacy_conversion_step2]
# 2) Call dvips to create one PS file for each DVI page
# [legacy_conversion_step3]
# 3) If dvips fails look for PDF and call gs to produce bitmaps
# 4) Otherwise call gs on each PostScript file to produce bitmaps
# [legacy_conversion_pdflatex]
# 5) Keep track of pages on which gs failed and pass them to pdflatex
# 6) Call gs on the PDF output from pdflatex to produce bitmaps
# 7) Extract and write to file (or return to lyxpreview2bitmap)
# metrics from both methods (standard and pdflatex)
# The script uses the old dvi->ps->png conversion route,
# which is good when using PSTricks, TikZ or other packages involving
# PostScript literals (steps 1, 2, 4).
# This script also generates bitmaps from PDF created by a call to
# lyxpreview2bitmap.py passing "pdflatex" to the CONVERTER parameter
# (step 3).
# Finally, there's also has a fallback method based on pdflatex, which
# is required in certain cases, if hyperref is active for instance,
# (step 5, 6).
# If possible, dvipng should be used, as it's much faster.
import glob, os, pipes, re, string, sys
from lyxpreview_tools import copyfileobj, error, filter_pages, find_exe, \
find_exe_or_terminate, join_metrics_and_rename, latex_commands, \
latex_file_re, make_texcolor, mkstemp, pdflatex_commands, progress, \
run_command, run_latex, warning, write_metrics_info
def usage(prog_name):
return "Usage: %s <latex file> <dpi> ppm <fg color> <bg color>\n" \
"\twhere the colors are hexadecimal strings, eg 'faf0e6'" \
% prog_name
# Returns a list of tuples containing page number and ascent fraction
# extracted from dvipng output.
# Use write_metrics_info to create the .metrics file with this info
def legacy_extract_metrics_info(log_file):
log_re = re.compile("Preview: ([ST])")
data_re = re.compile("(-?[0-9]+) (-?[0-9]+) (-?[0-9]+) (-?[0-9]+)")
tp_ascent = 0.0
tp_descent = 0.0
success = 0
results = []
try:
for line in open(log_file, 'r').readlines():
match = log_re.match(line)
if match == None:
continue
snippet = (match.group(1) == 'S')
success = 1
match = data_re.search(line)
if match == None:
error("Unexpected data in %s\n%s" % (log_file, line))
if snippet:
ascent = string.atof(match.group(2))
descent = string.atof(match.group(3))
frac = 0.5
if ascent == 0 and descent == 0:
# This is an empty image, forbid its display
frac = -1.0
elif ascent >= 0 or descent >= 0:
ascent = ascent + tp_ascent
descent = descent - tp_descent
if abs(ascent + descent) > 0.1:
frac = ascent / (ascent + descent)
# Sanity check
if frac < 0 or frac > 1:
frac = 0.5
results.append((int(match.group(1)), frac))
else:
tp_descent = string.atof(match.group(2))
tp_ascent = string.atof(match.group(4))
except:
# Unable to open the file, but do nothing here because
# the calling function will act on the value of 'success'.
warning('Warning in legacy_extract_metrics_info! Unable to open "%s"' % log_file)
warning(`sys.exc_type` + ',' + `sys.exc_value`)
if success == 0:
error("Failed to extract metrics info from %s" % log_file)
return results
def extract_resolution(log_file, dpi):
fontsize_re = re.compile("Preview: Fontsize")
magnification_re = re.compile("Preview: Magnification")
extract_decimal_re = re.compile("([0-9\.]+)")
extract_integer_re = re.compile("([0-9]+)")
found_fontsize = 0
found_magnification = 0
# Default values
magnification = 1000.0
fontsize = 10.0
try:
for line in open(log_file, 'r').readlines():
if found_fontsize and found_magnification:
break
if not found_fontsize:
match = fontsize_re.match(line)
if match != None:
match = extract_decimal_re.search(line)
if match == None:
error("Unable to parse: %s" % line)
fontsize = string.atof(match.group(1))
found_fontsize = 1
continue
if not found_magnification:
match = magnification_re.match(line)
if match != None:
match = extract_integer_re.search(line)
if match == None:
error("Unable to parse: %s" % line)
magnification = string.atof(match.group(1))
found_magnification = 1
continue
except:
warning('Warning in extract_resolution! Unable to open "%s"' % log_file)
warning(`sys.exc_type` + ',' + `sys.exc_value`)
# This is safe because both fontsize and magnification have
# non-zero default values.
return dpi * (10.0 / fontsize) * (1000.0 / magnification)
def legacy_latex_file(latex_file, fg_color, bg_color):
use_preview_re = re.compile(r"\s*\\usepackage\[([^]]+)\]{preview}")
fg_color_gr = make_texcolor(fg_color, True)
bg_color_gr = make_texcolor(bg_color, True)
tmp = mkstemp()
success = 0
try:
f = open(latex_file, 'r')
except:
# Unable to open the file, but do nothing here because
# the calling function will act on the value of 'success'.
warning('Warning in legacy_latex_file! Unable to open "%s"' % latex_file)
warning(`sys.exc_type` + ',' + `sys.exc_value`)
for line in f.readlines():
if success:
tmp.write(line)
continue
match = use_preview_re.match(line)
if match == None:
tmp.write(line)
continue
success = 1
# Package order: color should be loaded before preview
# Preview options: add the options lyx and tightpage
tmp.write(r"""
\usepackage{color}
\definecolor{fg}{rgb}{%s}
\definecolor{bg}{rgb}{%s}
\pagecolor{bg}
\usepackage[%s,tightpage]{preview}
\makeatletter
\g@addto@macro\preview{\begingroup\color{bg}\special{ps::clippath fill}\color{fg}}
\g@addto@macro\endpreview{\endgroup}
\makeatother
""" % (fg_color_gr, bg_color_gr, match.group(1)))
if success:
copyfileobj(tmp, open(latex_file,"wb"), 1)
return success
def crop_files(pnmcrop, basename):
t = pipes.Template()
t.append('%s -left' % pnmcrop, '--')
t.append('%s -right' % pnmcrop, '--')
for file in glob.glob("%s*.ppm" % basename):
tmp = mkstemp()
new = t.open(file, "r")
copyfileobj(new, tmp)
if not new.close():
copyfileobj(tmp, open(file,"wb"), 1)
def legacy_conversion(argv, skipMetrics = False):
# Parse and manipulate the command line arguments.
if len(argv) == 7:
latex = [argv[6]]
elif len(argv) != 6:
error(usage(argv[0]))
else:
latex = None
dir, latex_file = os.path.split(argv[1])
if len(dir) != 0:
os.chdir(dir)
dpi = string.atoi(argv[2])
output_format = argv[3]
fg_color = argv[4]
bg_color = argv[5]
# External programs used by the script.
latex = find_exe_or_terminate(latex or latex_commands)
pdf_output = latex in pdflatex_commands
return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
bg_color, latex, pdf_output, skipMetrics)
# Add color info to the latex file, since ghostscript doesn't
# have the option to set foreground and background colors on
# the command line. Run the resulting file through latex.
def legacy_conversion_step1(latex_file, dpi, output_format, fg_color, bg_color,
latex, pdf_output = False, skipMetrics = False):
# Move color information, lyx and tightpage options into the latex file.
if not legacy_latex_file(latex_file, fg_color, bg_color):
error("""Unable to move the color information, and the lyx and tightpage
options of preview-latex, into the latex file""")
# Compile the latex file.
latex_status, latex_stdout = run_latex(latex, latex_file)
if latex_status:
return (latex_status, [])
if pdf_output:
return legacy_conversion_step3(latex_file, dpi, output_format, True, skipMetrics)
else:
return legacy_conversion_step2(latex_file, dpi, output_format, skipMetrics)
# Creates a new LaTeX file from the original with pages specified in
# failed_pages, pass it through pdflatex and updates the metrics
# from the standard legacy route
def legacy_conversion_pdflatex(latex_file, failed_pages, legacy_metrics, gs,
gs_device, gs_ext, alpha, resolution, output_format):
# Search for pdflatex executable
pdflatex = find_exe(["pdflatex"])
if pdflatex == None:
warning("Can't find pdflatex. Some pages failed with all the possible routes.")
else:
# Create a new LaTeX file from the original but only with failed pages
pdf_latex_file = latex_file_re.sub("_pdflatex.tex", latex_file)
filter_pages(latex_file, pdf_latex_file, failed_pages)
# pdflatex call
pdflatex_status, pdflatex_stdout = run_latex(pdflatex, pdf_latex_file)
pdf_file = latex_file_re.sub(".pdf", pdf_latex_file)
# GhostScript call to produce bitmaps
gs_call = '%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=%s ' \
'-sOutputFile="%s%%d.%s" ' \
'-dGraphicsAlphaBit=%d -dTextAlphaBits=%d ' \
'-r%f "%s"' \
% (gs, gs_device, latex_file_re.sub("", pdf_latex_file), \
gs_ext, alpha, alpha, resolution, pdf_file)
gs_status, gs_stdout = run_command(gs_call)
if gs_status:
# Give up!
warning("Some pages failed with all the possible routes")
else:
# We've done it!
pdf_log_file = latex_file_re.sub(".log", pdf_latex_file)
pdf_metrics = legacy_extract_metrics_info(pdf_log_file)
original_bitmap = latex_file_re.sub("%d." + output_format, pdf_latex_file)
destination_bitmap = latex_file_re.sub("%d." + output_format, latex_file)
# Join the metrics with the those from dvips and rename the bitmap images
join_metrics_and_rename(legacy_metrics, pdf_metrics, failed_pages,
original_bitmap, destination_bitmap)
# The file has been processed through latex and we expect dvi output.
# Run dvips, taking note whether it was successful.
def legacy_conversion_step2(latex_file, dpi, output_format, skipMetrics = False):
# External programs used by the script.
dvips = find_exe_or_terminate(["dvips"])
# Run the dvi file through dvips.
dvi_file = latex_file_re.sub(".dvi", latex_file)
ps_file = latex_file_re.sub(".ps", latex_file)
dvips_call = '%s -i -o "%s" "%s"' % (dvips, ps_file, dvi_file)
dvips_failed = False
dvips_status, dvips_stdout = run_command(dvips_call)
if dvips_status:
warning('Failed: %s %s ... looking for PDF' \
% (os.path.basename(dvips), dvi_file))
dvips_failed = True
return legacy_conversion_step3(latex_file, dpi, output_format, dvips_failed, skipMetrics)
# Either latex and dvips have been run and we have a ps file, or
# pdflatex has been run and we have a pdf file. Proceed with gs.
def legacy_conversion_step3(latex_file, dpi, output_format, dvips_failed, skipMetrics = False):
# External programs used by the script.
gs = find_exe_or_terminate(["gswin32c", "gswin64c", "gs"])
pnmcrop = find_exe(["pnmcrop"])
# Files to process
pdf_file = latex_file_re.sub(".pdf", latex_file)
ps_file = latex_file_re.sub(".ps", latex_file)
# Extract resolution data for gs from the log file.
log_file = latex_file_re.sub(".log", latex_file)
resolution = extract_resolution(log_file, dpi)
# Older versions of gs have problems with a large degree of
# anti-aliasing at high resolutions
alpha = 4
if resolution > 150:
alpha = 2
gs_device = "png16m"
gs_ext = "png"
if output_format == "ppm":
gs_device = "pnmraw"
gs_ext = "ppm"
# Extract the metrics from the log file
legacy_metrics = legacy_extract_metrics_info(log_file)
# List of pages which failed to produce a correct output
failed_pages = []
# Generate the bitmap images
if dvips_failed:
# dvips failed, maybe there's a PDF, try to produce bitmaps
gs_call = '%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=%s ' \
'-sOutputFile="%s%%d.%s" ' \
'-dGraphicsAlphaBit=%d -dTextAlphaBits=%d ' \
'-r%f "%s"' \
% (gs, gs_device, latex_file_re.sub("", latex_file), \
gs_ext, alpha, alpha, resolution, pdf_file)
gs_status, gs_stdout = run_command(gs_call)
if gs_status:
error("Failed: %s %s" % (os.path.basename(gs), ps_file))
else:
# Model for calling gs on each file
gs_call = '%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=%s ' \
'-sOutputFile="%s%%d.%s" ' \
'-dGraphicsAlphaBit=%d -dTextAlphaBits=%d ' \
'-r%f "%%s"' \
% (gs, gs_device, latex_file_re.sub("", latex_file), \
gs_ext, alpha, alpha, resolution)
i = 0
# Collect all the PostScript files (like *.001, *.002, ...)
ps_files = glob.glob("%s.[0-9][0-9][0-9]" % latex_file_re.sub("", latex_file))
ps_files.sort()
# Call GhostScript for each file
for file in ps_files:
i = i + 1
progress("Processing page %s, file %s" % (i, file))
gs_status, gs_stdout = run_command(gs_call % (i, file))
if gs_status:
# gs failed, keep track of this
warning("Ghostscript failed on page %s, file %s" % (i, file))
failed_pages.append(i)
# Pass failed pages to pdflatex
if len(failed_pages) > 0:
legacy_conversion_pdflatex(latex_file, failed_pages, legacy_metrics, gs,
gs_device, gs_ext, alpha, resolution, output_format)
# Crop the images
if pnmcrop != None:
crop_files(pnmcrop, latex_file_re.sub("", latex_file))
# Allow to skip .metrics creation for custom management
# (see the dvipng method)
if not skipMetrics:
# Extract metrics info from the log file.
metrics_file = latex_file_re.sub(".metrics", latex_file)
write_metrics_info(legacy_metrics, metrics_file)
return (0, legacy_metrics)
if __name__ == "__main__":
sys.exit(legacy_conversion(sys.argv)[0])