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a246ccca | 1 | # GNU MediaGoblin -- federated, autonomous media hosting |
cf29e8a8 | 2 | # Copyright (C) 2011, 2012 MediaGoblin contributors. See AUTHORS. |
a246ccca JW |
3 | # |
4 | # This program is free software: you can redistribute it and/or modify | |
5 | # it under the terms of the GNU Affero General Public License as published by | |
6 | # the Free Software Foundation, either version 3 of the License, or | |
7 | # (at your option) any later version. | |
8 | # | |
9 | # This program is distributed in the hope that it will be useful, | |
10 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | # GNU Affero General Public License for more details. | |
13 | # | |
14 | # You should have received a copy of the GNU Affero General Public License | |
15 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | ||
17 | import Image | |
18 | import ImageFont | |
19 | import ImageDraw | |
20 | import logging | |
21 | import pkg_resources | |
22 | import os | |
23 | ||
24 | _log = logging.getLogger(__name__) | |
25 | ||
26 | class AsciiToImage(object): | |
27 | ''' | |
28 | Converter of ASCII art into image files, preserving whitespace | |
29 | ||
30 | kwargs: | |
31 | - font: Path to font file | |
32 | default: fonts/Inconsolata.otf | |
33 | - font_size: Font size, ``int`` | |
34 | default: 11 | |
35 | ''' | |
36 | ||
37 | # Font file path | |
38 | _font = None | |
39 | ||
40 | _font_size = 11 | |
41 | ||
42 | # ImageFont instance | |
43 | _if = None | |
44 | ||
45 | # ImageFont | |
46 | _if_dims = None | |
47 | ||
48 | # Image instance | |
49 | _im = None | |
50 | ||
51 | def __init__(self, **kw): | |
52 | if kw.get('font'): | |
53 | self._font = kw.get('font') | |
54 | else: | |
55 | self._font = pkg_resources.resource_filename( | |
56 | 'mediagoblin.media_types.ascii', | |
57 | os.path.join('fonts', 'Inconsolata.otf')) | |
58 | ||
59 | if kw.get('font_size'): | |
60 | self._font_size = kw.get('font_size') | |
61 | ||
62 | _log.info('Setting font to {0}, size {1}'.format( | |
63 | self._font, | |
64 | self._font_size)) | |
65 | ||
66 | self._if = ImageFont.truetype( | |
67 | self._font, | |
68 | self._font_size) | |
69 | ||
70 | # ,-,-^-'-^'^-^'^-'^-. | |
71 | # ( I am a wall socket )Oo, ___ | |
72 | # `-.,.-.,.-.-.,.-.--' ' ` | |
73 | # Get the size, in pixels of the '.' character | |
74 | self._if_dims = self._if.getsize('.') | |
75 | # `---' | |
76 | ||
77 | def convert(self, text, destination): | |
78 | # TODO: Detect if text is a file-like, if so, act accordingly | |
79 | im = self._create_image(text) | |
80 | ||
81 | # PIL's Image.save will handle both file-likes and paths | |
82 | if im.save(destination): | |
83 | _log.info('Saved image in {0}'.format( | |
84 | destination)) | |
85 | ||
86 | def _create_image(self, text): | |
87 | ''' | |
88 | Write characters to a PIL image canvas. | |
89 | ||
90 | TODO: | |
91 | - Character set detection and decoding, | |
92 | http://pypi.python.org/pypi/chardet | |
93 | ''' | |
94 | # TODO: Account for alternative line endings | |
95 | lines = text.split('\n') | |
96 | ||
97 | line_lengths = [len(i) for i in lines] | |
98 | ||
99 | # Calculate destination size based on text input and character size | |
100 | im_dims = ( | |
101 | max(line_lengths) * self._if_dims[0], | |
102 | len(line_lengths) * self._if_dims[1]) | |
103 | ||
104 | _log.info('Destination image dimensions will be {0}'.format( | |
105 | im_dims)) | |
106 | ||
107 | im = Image.new( | |
108 | 'RGBA', | |
109 | im_dims, | |
110 | (255, 255, 255, 0)) | |
111 | ||
112 | draw = ImageDraw.Draw(im) | |
113 | ||
114 | char_pos = [0, 0] | |
115 | ||
116 | for line in lines: | |
117 | line_length = len(line) | |
118 | ||
119 | _log.debug('Writing line at {0}'.format(char_pos)) | |
120 | ||
121 | for _pos in range(0, line_length): | |
122 | char = line[_pos] | |
123 | ||
124 | px_pos = self._px_pos(char_pos) | |
125 | ||
126 | _log.debug('Writing character "{0}" at {1} (px pos {2}'.format( | |
127 | char, | |
128 | char_pos, | |
129 | px_pos)) | |
130 | ||
131 | draw.text( | |
132 | px_pos, | |
133 | char, | |
134 | font=self._if, | |
135 | fill=(0, 0, 0, 255)) | |
136 | ||
137 | char_pos[0] += 1 | |
138 | ||
139 | # Reset X position, increment Y position | |
140 | char_pos[0] = 0 | |
141 | char_pos[1] += 1 | |
142 | ||
143 | return im | |
144 | ||
145 | def _px_pos(self, char_pos): | |
146 | ''' | |
147 | Helper function to calculate the pixel position based on | |
148 | character position and character dimensions | |
149 | ''' | |
150 | px_pos = [0, 0] | |
151 | for index, val in zip(range(0, len(char_pos)), char_pos): | |
152 | px_pos[index] = char_pos[index] * self._if_dims[index] | |
153 | ||
154 | return px_pos | |
155 | ||
156 | ||
157 | if __name__ == "__main__": | |
158 | import urllib | |
159 | txt = urllib.urlopen('file:///home/joar/Dropbox/ascii/install-all-the-dependencies.txt') | |
160 | ||
161 | _log.setLevel(logging.DEBUG) | |
162 | logging.basicConfig() | |
163 | ||
164 | converter = AsciiToImage() | |
165 | ||
166 | converter.convert(txt.read(), '/tmp/test.png') | |
167 | ||
168 | ''' | |
169 | im, x, y, duration = renderImage(h, 10) | |
170 | print "Rendered image in %.5f seconds" % duration | |
171 | im.save('tldr.png', "PNG") | |
172 | ''' |