Package: pdfposter
Version: 0.4.4-2
Severity: wishlist
Tags: patch upstream
Forwarded: http://pdfposter.origo.ethz.ch/node/39
At the moment, pdfposter prints full-bleed to the edge of the pages.
Most real-world printers can't handle this, so it leaves gaps in the
printed material as a result.
The attached patch applies to pdfposter 0.5.0 and creates an overlap
option. It was originally reported to upstream at
http://pdfposter.origo.ethz.ch/node/39, and the patch was updated by
me, as noted in the upstream bug log.
This is not the full fix for full-bleed printing, but it's a start,
and it certainly makes it easier to re-assemble pages after printing.
--dkg
-- System Information:
Debian Release: wheezy/sid
APT prefers testing
APT policy: (500, 'testing'), (200, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Kernel: Linux 3.1.0-1-686-pae (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages pdfposter depends on:
ii python 2.7.2-9
ii python-pypdf 1.13-1
ii python-support 1.0.14
pdfposter recommends no packages.
pdfposter suggests no packages.
-- no debconf information
--- a/pdftools/pdfposter/__init__.py
+++ b/pdftools/pdfposter/__init__.py
@@ -32,6 +32,7 @@
import math
DEFAULT_MEDIASIZE = 'a4'
+DEFAULT_OVERLAP_PERCENT = 0
mm = 72 / 25.4
@@ -136,12 +137,12 @@
log(18, 'Rotating %s specs to portrait format', which)
return True
-def decide_num_pages(inbox, mediabox, posterbox, scale=None):
+def decide_num_pages(inbox, mediabox, posterbox, scale=None, overlap=0.01*DEFAULT_OVERLAP_PERCENT):
"""decide on number of pages"""
# avoid changing original posterbox when handling multiple pages
# (if --scale, posterbox is None)
posterbox = posterbox and posterbox.copy()
- cutmargin = {'x': 0, 'y': 0} # todo
+ cutmargin = {'x': mediabox['width']*overlap, 'y': mediabox['height']*overlap} # todo
whitemargin = {'x': 0, 'y': 0} # todo
# media and image sizes (inbox) are fixed already
# available drawing area per sheet
@@ -240,16 +241,17 @@
page[NameObject('/Contents')] = content
-def posterize(outpdf, page, mediabox, posterbox, scale):
+def posterize(outpdf, page, mediabox, posterbox, scale, overlap=0.01*DEFAULT_OVERLAP_PERCENT):
"""
page: input page
mediabox : size secs of the media to print on
posterbox: size secs of the resulting poster
scale: scale factor (to be used instead of posterbox)
+ overlap: proportion of expected overlap per output page
"""
inbox = rectangle2box(page.artBox)
ncols, nrows, scale, rotate = decide_num_pages(inbox, mediabox,
- posterbox, scale)
+ posterbox, scale, overlap)
mediabox = mediabox.copy()
_scale_pdf_page(page, scale)
if rotate:
@@ -257,8 +259,8 @@
rotate_box(inbox)
rotate_box(mediabox)
# area to put on each page (allows for overlay of margin)
- h_step = mediabox['width'] - mediabox['offset_x']
- v_step = mediabox['height'] - mediabox['offset_y']
+ h_wid = mediabox['width'] - mediabox['offset_x']
+ v_hi = mediabox['height'] - mediabox['offset_y']
trimbox = rectangle2box(page.trimBox)
h_pos = float(trimbox['offset_x'])
@@ -272,15 +274,15 @@
# transparent fill box behind, so the real content is in
# the lower left corner
newpage.mediaBox = RectangleObject((h_pos, v_pos,
- h_pos + h_step,
- v_pos + v_step))
+ h_pos + h_wid,
+ v_pos + v_hi))
newpage.trimBox = RectangleObject((h_pos, v_pos,
- min(h_max, h_pos + h_step),
- min(v_max, v_pos + v_step)))
+ min(h_max, h_pos + h_wid),
+ min(v_max, v_pos + v_hi)))
newpage.cropBox = newpage.artBox = newpage.trimBox
outpdf.addPage(newpage)
- v_pos += v_step
- h_pos += h_step
+ v_pos += v_hi*(1-overlap)
+ h_pos += h_wid*(1-overlap)
def password_hook():
import getpass
@@ -308,6 +310,7 @@
for i, page in enumerate(inpdf.pages):
log(19, '---- processing page %i -----', i+1)
- posterize(outpdf, page, opts.media_size, opts.poster_size, opts.scale)
+ posterize(outpdf, page, opts.media_size, opts.poster_size, opts.scale,
+ opts.overlap_percent*0.01)
if not opts.dry_run:
outpdf.write(open(outfilename, 'wb'))
--- a/pdftools/pdfposter/cmd.py
+++ b/pdftools/pdfposter/cmd.py
@@ -23,7 +23,7 @@
__copyright__ = "Copyright 2008-2009 by Hartmut Goebel <h.goe...@goebel-consult.de>"
__licence__ = "GNU General Public License version 3 (GPL v3)"
-from . import main, __version__, DEFAULT_MEDIASIZE, papersizes, DecryptionError
+from . import main, __version__, DEFAULT_OVERLAP_PERCENT, DEFAULT_MEDIASIZE, papersizes, DecryptionError
import re
# pattern for parsing user textual box spec
@@ -92,6 +92,8 @@
help='Specify the poster size (defaults to media size). ')
group.add_option('-s', '--scale', type=float,
help='Specify a linear scaling factor to produce the poster.')
+ group.add_option('-O', '--overlap-percent', type=float, default = DEFAULT_OVERLAP_PERCENT,
+ help='Image overlap (default: %g).' % DEFAULT_OVERLAP_PERCENT)
opts, args = parser.parse_args()
--- a/pdfposter.1
+++ b/pdfposter.1
@@ -102,6 +102,16 @@
.B \-n , \-\-dry\-run
Show what would have been done, but do not generate files.
+.TP
+.B \-O , \-\-overlap\-percent NNN
+Specify amount to overlap of adjacent pages. If this factor is
+positive, the input pages actually overlap (or often only their
+margins overlap harmlessly). A negative factor increases gaps between
+pages. The factor is given in percent of the media page size. Default
+0.
+.B \-O 5
+ is suggested for an approximation of collapsing margins.
+
.UNINDENT
.SS Defining Output
