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lyx_mirror/lib/scripts/legacy_lyxpreview2ppm.py
Juergen Spitzmueller 7945ba0cb0 Load color before polyglossia also in preview snippets 
This fixes an error in the preview generation with polyglossia
and bidi that prevents snippet generation (and consequently also
"math as image" xhtml output).

Fixes: #10716.
2017-07-11 10:03:03 +02:00

588 lines
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Python
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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).
# * pdftocairo (optional).
# * epstopdf (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 pdftocairo or gs to produce bitmaps
# 4) Otherwise call pdftocairo or 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 pdftocairo or 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.
# If possible, the script will use pdftocairo instead of gs,
# as it's much faster and gives better results.
import glob, os, pipes, re, sys, tempfile
from lyxpreview_tools import check_latex_log, copyfileobj, error, filter_pages,\
find_exe, find_exe_or_terminate, join_metrics_and_rename, latex_commands, \
latex_file_re, make_texcolor, 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 = float(match.group(2))
descent = float(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 = float(match.group(2))
tp_ascent = float(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(repr(sys.exc_info()[0]) + ',' + repr(sys.exc_info()[1]))
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 = float(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 = float(match.group(1))
found_magnification = 1
continue
except:
warning('Warning in extract_resolution! Unable to open "%s"' % log_file)
warning(repr(sys.exc_info()[0]) + ',' + repr(sys.exc_info()[1]))
# 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_polyglossia_re = re.compile(b"\\s*\\\\usepackage{polyglossia}")
use_preview_re = re.compile(b"\\s*\\\\usepackage\\[([^]]+)\\]{preview}")
fg_color_gr = make_texcolor(fg_color, True)
bg_color_gr = make_texcolor(bg_color, True)
tmp = tempfile.TemporaryFile()
success = 0
try:
f = open(latex_file, 'rb')
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(repr(sys.exc_info()[0]) + ',' + repr(sys.exc_info()[1]))
polyglossia = False
for line in f.readlines():
if success:
tmp.write(line)
continue
match = use_preview_re.match(line)
polymatch = use_polyglossia_re.match(line)
# Package order:
# * if polyglossia is used, we need to load color before that
# (also, we do not have to load lmodern)
# * else, color should be loaded before preview
if match == None:
if polymatch == None:
tmp.write(line)
continue
else:
tmp.write(b"""
\\usepackage{color}
\\definecolor{fg}{rgb}{%s}
\\definecolor{bg}{rgb}{%s}
\\pagecolor{bg}
\\usepackage{polyglossia}
""" % (fg_color_gr, bg_color_gr))
polyglossia = True
continue
success = 1
# Preview options: add the options lyx and tightpage
previewopts = match.group(1)
if not polyglossia:
tmp.write(b"""
\\usepackage{color}
\\definecolor{fg}{rgb}{%s}
\\definecolor{bg}{rgb}{%s}
\\pagecolor{bg}
\\usepackage[%s,tightpage]{preview}
\\makeatletter
\\def\\t@a{cmr}
\\if\\f@family\\t@a
\\IfFileExists{lmodern.sty}{\\usepackage{lmodern}}{\\usepackage{ae,aecompl}}
\\fi
\\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, previewopts))
else:
tmp.write(b"""
\\usepackage[%s,tightpage]{preview}
\\makeatletter
\\g@addto@macro\\preview{\\begingroup\\color{bg}\\special{ps::clippath fill}\\color{fg}}
\\g@addto@macro\\endpreview{\\endgroup}
\\makeatother
""" % previewopts)
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 = tempfile.TemporaryFile()
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 = int(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:
progress("Will try to recover from %s failure" % latex)
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,
use_pdftocairo, conv, gs_device, gs_ext, alpha, resolution, output_format):
error_count = 0
# Search for pdflatex executable
pdflatex = find_exe(["pdflatex"])
if pdflatex == None:
warning("Can't find pdflatex. Some pages failed with all the possible routes.")
failed_pages = []
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
error_pages = []
pdflatex_status, pdflatex_stdout = run_latex(pdflatex, pdf_latex_file)
if pdflatex_status:
error_pages = check_latex_log(latex_file_re.sub(".log", pdf_latex_file))
pdf_file = latex_file_re.sub(".pdf", pdf_latex_file)
latex_file_root = latex_file_re.sub("", pdf_latex_file)
# Converter call to produce bitmaps
if use_pdftocairo:
conv_call = '%s -png -transp -r %d "%s" "%s"' \
% (conv, resolution, pdf_file, latex_file_root)
conv_status, conv_stdout = run_command(conv_call)
if not conv_status:
seqnum_re = re.compile("-([0-9]+)")
for name in glob.glob("%s-*.png" % latex_file_root):
match = seqnum_re.search(name)
if match != None:
new_name = seqnum_re.sub(str(int(match.group(1))), name)
os.rename(name, new_name)
else:
conv_call = '%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=%s ' \
'-sOutputFile="%s%%d.%s" ' \
'-dGraphicsAlphaBit=%d -dTextAlphaBits=%d ' \
'-r%f "%s"' \
% (conv, gs_device, latex_file_root, \
gs_ext, alpha, alpha, resolution, pdf_file)
conv_status, conv_stdout = run_command(conv_call)
if conv_status:
# Give up!
warning("Some pages failed with all the possible routes")
failed_pages = []
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)
# Invalidate metrics for pages that produced errors
if len(error_pages) > 0:
for index in error_pages:
pdf_metrics.pop(index - 1)
pdf_metrics.insert(index - 1, (index, -1.0))
error_count += 1
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)
return error_count
# 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 pdftocairo or 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"])
pdftocairo = find_exe(["pdftocairo"])
epstopdf = find_exe(["epstopdf"])
use_pdftocairo = pdftocairo != None and output_format == "png"
if use_pdftocairo and os.name == 'nt':
# On Windows, check for png support (see #10718)
conv_status, conv_stdout = run_command("%s --help" % pdftocairo)
use_pdftocairo = '-png' in conv_stdout
if use_pdftocairo:
conv = pdftocairo
else:
conv = gs
# Files to process
pdf_file = latex_file_re.sub(".pdf", latex_file)
ps_file = latex_file_re.sub(".ps", latex_file)
# The latex file name without extension
latex_file_root = latex_file_re.sub("", latex_file)
# Extract resolution data for the converter from the log file.
log_file = latex_file_re.sub(".log", latex_file)
resolution = extract_resolution(log_file, dpi)
# Check whether some pages produced errors
error_pages = check_latex_log(log_file)
# 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
if use_pdftocairo:
conv_call = '%s -png -transp -r %d "%s" "%s"' \
% (pdftocairo, resolution, pdf_file, latex_file_root)
conv_status, conv_stdout = run_command(conv_call)
if not conv_status:
seqnum_re = re.compile("-([0-9]+)")
for name in glob.glob("%s-*.png" % latex_file_root):
match = seqnum_re.search(name)
if match != None:
new_name = seqnum_re.sub(str(int(match.group(1))), name)
os.rename(name, new_name)
else:
conv_call = '%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=%s ' \
'-sOutputFile="%s%%d.%s" ' \
'-dGraphicsAlphaBit=%d -dTextAlphaBits=%d ' \
'-r%f "%s"' \
% (gs, gs_device, latex_file_root, \
gs_ext, alpha, alpha, resolution, pdf_file)
conv_status, conv_stdout = run_command(conv_call)
if conv_status:
error("Failed: %s %s" % (os.path.basename(conv), pdf_file))
else:
# Model for calling the converter on each file
if use_pdftocairo and epstopdf != None:
conv_call = '%s -png -transp -singlefile -r %d "%%s" "%s%%d"' \
% (pdftocairo, resolution, latex_file_root)
else:
conv_call = '%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=%s ' \
'-sOutputFile="%s%%d.%s" ' \
'-dGraphicsAlphaBit=%d -dTextAlphaBits=%d ' \
'-r%f "%%s"' \
% (gs, gs_device, latex_file_root, \
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_root)
ps_files.sort()
# Call the converter for each file
for file in ps_files:
i = i + 1
progress("Processing page %s, file %s" % (i, file))
if use_pdftocairo and epstopdf != None:
conv_name = "epstopdf"
conv_status, conv_stdout = run_command("%s --outfile=%s.pdf %s"
% (epstopdf, file, file))
if not conv_status:
conv_name = "pdftocairo"
file = file + ".pdf"
conv_status, conv_stdout = run_command(conv_call % (file, i))
else:
conv_name = "ghostscript"
conv_status, conv_stdout = run_command(conv_call % (i, file))
if conv_status:
# The converter failed, keep track of this
warning("%s failed on page %s, file %s" % (conv_name, i, file))
failed_pages.append(i)
# Pass failed pages to pdflatex
if len(failed_pages) > 0:
warning("Now trying to obtain failed previews through pdflatex")
error_count = legacy_conversion_pdflatex(latex_file, failed_pages,
legacy_metrics, use_pdftocairo, conv, gs_device, gs_ext, alpha,
resolution, output_format)
else:
error_count = 0
# Invalidate metrics for pages that produced errors
if len(error_pages) > 0:
for index in error_pages:
if index not in failed_pages:
legacy_metrics.pop(index - 1)
legacy_metrics.insert(index - 1, (index, -1.0))
error_count += 1
# Crop the ppm images
if pnmcrop != None and output_format == "ppm":
crop_files(pnmcrop, latex_file_root)
# 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)
if error_count:
warning("Failed to produce %d preview snippet(s)" % error_count)
return (0, legacy_metrics)
if __name__ == "__main__":
sys.exit(legacy_conversion(sys.argv)[0])
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