1 ;;;; This file is part of LilyPond, the GNU music typesetter.
3 ;;;; Copyright (C) 2005--2009 Jan Nieuwenhuizen <janneke@gnu.org>
5 ;;;; LilyPond is free software: you can redistribute it and/or modify
6 ;;;; it under the terms of the GNU General Public License as published by
7 ;;;; the Free Software Foundation, either version 3 of the License, or
8 ;;;; (at your option) any later version.
10 ;;;; LilyPond is distributed in the hope that it will be useful,
11 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
12 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 ;;;; GNU General Public License for more details.
15 ;;;; You should have received a copy of the GNU General Public License
16 ;;;; along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
18 (define-module (scm ps-to-png))
30 ;; gettext wrapper for guile < 1.7.2
31 (if (defined? 'gettext)
32 (define-public _ gettext)
33 (define-public (_ x) x))
38 (car (string-tokenize (vector-ref (uname) 0) char-set:letter)))))
40 (define (re-sub re sub string)
41 (regexp-substitute/global #f re string 'pre sub 'post))
43 (define (search-executable names)
44 (define (helper path lst)
47 (if (search-path path (car lst)) (car lst)
48 (helper path (cdr lst)))))
50 (let ((path (parse-path (getenv "PATH"))))
54 (search-executable '("gs-nox" "gs-8.15" "gs")))
56 (define (gulp-port port max-length)
57 (let ((str (make-string max-length)))
58 (read-string!/partial str port 0 max-length)
61 (define-public (gulp-file file-name . max-size)
62 (ly:gulp-file file-name (if (pair? max-size) (car max-size))))
64 ;; copy of ly:system. ly:* not available via lilypond-ps2png.scm
65 (define (my-system be-verbose exit-on-error cmd)
69 (format (current-error-port) (_ "Invoking `~a'...") cmd)
70 (newline (current-error-port))))
71 (set! status (system cmd))
72 (if (not (= status 0))
74 (format (current-error-port)
75 (format #f (_ "~a exited with status: ~S") "GS" status))
76 (if exit-on-error (exit 1))))
79 (define (scale-down-image be-verbose factor file)
82 (old (string-append file ".old")))
84 (rename-file file old)
88 "pngtopnm ~a | pnmscale -reduce ~a 2>/dev/null | pnmtopng -compression 9 2>/dev/null > ~a"
94 (define-public (ps-page-count ps-name)
95 (let* ((byte-count 10240)
96 (header (gulp-file ps-name byte-count))
97 (first-null (string-index header #\nul))
98 (match (string-match "%%Pages: ([0-9]+)"
99 (if (number? first-null)
100 (substring header 0 first-null)
102 (if match (string->number (match:substring match 1)) 0)))
104 (define-public (make-ps-images ps-name . rest)
111 (be-verbose (ly:get-option 'verbose))
112 (pixmap-format 'png16m)
113 (anti-alias-factor 1))
115 (let* ((format-str (format "~a" pixmap-format))
117 ((string-contains format-str "png") "png")
118 ((string-contains format-str "jpg") "jpeg")
119 ((string-contains format-str "jpeg") "jpeg")
121 (ly:error "Unknown pixmap format ~a" pixmap-format))))
122 (base (dir-basename ps-name ".ps" ".eps"))
123 (png1 (format "~a.~a" base extension))
124 (pngn (format "~a-page%d.~a" base extension))
125 (page-count (ps-page-count ps-name))
126 (multi-page? (> page-count 1))
127 (output-file (if multi-page? pngn png1))
131 (format #f "-dDEVICEWIDTHPOINTS=~,2f -dDEVICEHEIGHTPOINTS=~,2f"
132 page-width page-height)
137 -dGraphicsAlphaBits=4\
146 (if be-verbose "" "-q")
150 (* anti-alias-factor resolution) ps-name))
154 ;; The wrapper on windows cannot handle `=' signs,
155 ;; gs has a workaround with #.
156 (if (eq? PLATFORM 'windows)
158 (set! cmd (re-sub "=" "#" cmd))
159 (set! cmd (re-sub "-dSAFER " "" cmd))))
161 (set! status (my-system be-verbose #f cmd))
167 (format "~a-page~a.png" base (1+ n)))
169 (list (format "~a.png" base))))
171 (if (not (= 0 status))
173 (map delete-file files)
176 (if (and rename-page-1 multi-page?)
178 (rename-file (re-sub "%d" "1" pngn) png1)
184 (if (not (= 1 anti-alias-factor))
186 (lambda (f) (scale-down-image be-verbose anti-alias-factor f)) files))