File: aalib.py

package info (click to toggle)
python-aalib 0.3.2-1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 132 kB
  • ctags: 96
  • sloc: python: 302; sh: 12; makefile: 7
file content (330 lines) | stat: -rw-r--r-- 9,754 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
# encoding=UTF-8

# Copyright © 2009-2015 Jakub Wilk <jwilk@jwilk.net>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the “Software”), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

'''
interface to AAlib, an ASCII art library
'''

import ctypes

libaa = ctypes.CDLL('libaa.so.1')

class Font(ctypes.Structure):
    pass

FontPtr = ctypes.POINTER(Font)

class Structure(ctypes.Structure):
    def clone(self):
        clone = type(self)()
        ctypes.pointer(clone)[0] = self
        return clone

class HardwareSettings(Structure):
    _pack_ = 4
    _fields_ = [
        ('font', FontPtr),
        ('options', ctypes.c_int),
        ('min_width', ctypes.c_int),
        ('min_height', ctypes.c_int),
        ('max_width', ctypes.c_int),
        ('max_height', ctypes.c_int),
        ('recommended_width', ctypes.c_int),
        ('recommended_height', ctypes.c_int),
        ('physical_width', ctypes.c_int),
        ('physical_height', ctypes.c_int),
        ('width', ctypes.c_int),
        ('height', ctypes.c_int),
        ('dim_value', ctypes.c_double),
        ('bold_value', ctypes.c_double),
    ]

HardwareSettingsPtr = ctypes.POINTER(HardwareSettings)

OPTION_NORMAL_MASK = 1
OPTION_DIM_MASK = 2
OPTION_BRIGHT_MASK = 4
OPTION_BOLD_MASK = 8
OPTION_REVERSE_MASK = 16
OPTION_ALL_MASKS = 128
OPTION_8BITS = 256

ATTRIBUTE_NORMAL = 0
ATTRIBUTE_DIM = 1
ATTRIBUTE_BRIGHT = 2
ATTRIBUTE_BOLD = 3
ATTRIBUTE_REVERSE = 4

DEFAULT_HARDWARE_SETTINGS = HardwareSettings.in_dll(libaa, 'aa_defparams')

class RenderSettings(Structure):
    _pack_ = 4
    _fields_ = [
        ('brightness', ctypes.c_int),
        ('contrast', ctypes.c_int),
        ('gamma', ctypes.c_float),
        ('dithering_mode', ctypes.c_int),
        ('inversion', ctypes.c_int),
        ('random', ctypes.c_int),
    ]

RenderSettingsPtr = ctypes.POINTER(RenderSettings)

DEFAULT_RENDER_SETTINGS = RenderSettings.in_dll(libaa, 'aa_defrenderparams')

DITHER_NONE = 0
DITHER_ERROR_DISTRIBUTION = 1
DITHER_FLOYD_STEINBERG = 2

class Driver(Structure):
    pass

DriverPtr = ctypes.POINTER(Driver)

class Context(Structure):
    pass

ContextPtr = ctypes.POINTER(Context)

aa_init = libaa.aa_init
aa_init.argtypes = [DriverPtr, HardwareSettingsPtr, ctypes.c_void_p]
aa_init.restype = ContextPtr

aa_close = libaa.aa_close
aa_close.argtypes = [ContextPtr]

aa_image = libaa.aa_image
aa_image.argtypes = [ContextPtr]
aa_image.restype = ctypes.POINTER(ctypes.c_ubyte)

aa_text = libaa.aa_text
aa_text.argtypes = [ContextPtr]
aa_text.restype = ctypes.POINTER(ctypes.c_ubyte)

aa_attrs = libaa.aa_attrs
aa_attrs.argtypes = [ContextPtr]
aa_attrs.restype = ctypes.POINTER(ctypes.c_ubyte)

aa_imgwidth = libaa.aa_imgwidth
aa_imgwidth.argtypes = [ContextPtr]
aa_imgwidth.restype = ctypes.c_int

aa_imgheight = libaa.aa_imgheight
aa_imgheight.argtypes = [ContextPtr]
aa_imgheight.restype = ctypes.c_int

aa_scrwidth = libaa.aa_scrwidth
aa_scrwidth.argtypes = [ContextPtr]
aa_scrwidth.restype = ctypes.c_int

aa_scrheight = libaa.aa_scrheight
aa_scrheight.argtypes = [ContextPtr]
aa_scrheight.restype = ctypes.c_int

aa_render = libaa.aa_render
aa_render.argtypes = [ContextPtr, RenderSettingsPtr] + 4 * [ctypes.c_int]

aa_mem_d = Driver.in_dll(libaa, 'mem_d')

class ScreenInitializationFailed(Exception):
    pass

class NoImageBuffer(Exception):
    pass

class Screen(object):

    def _get_default_settings(self):
        return DEFAULT_HARDWARE_SETTINGS.clone()

    def __init__(self, **kwargs):
        '''Initialize the virtual screen.

        Possible keyword arguments:
        - `font`,
        - `options`,
        - `min_width`, `min_height` (in pixels),
        - `max_width`, `max_height` (in pixels),
        - `recommended_width`, `recommended_height` (in pixels),
        - `width`, `height` (in pixels),
        - `physical_width`, `physical_height` (in mm),
        - `dim_value`,
        - `bold_value`.
        '''
        settings = self._get_default_settings()
        for k, v in kwargs.iteritems():
            setattr(settings, k, v)
        context = self._context = aa_init(ctypes.pointer(aa_mem_d), ctypes.pointer(settings), None)
        if context is None:
            raise ScreenInitializationFailed
        self._render_width = aa_scrwidth(context)
        self._render_height = aa_scrheight(context)
        self._virtual_width = aa_imgwidth(context)
        self._virtual_height = aa_imgheight(context)
        self._framebuffer = aa_image(context)

    def close(self):
        try:
            context = self._context
        except AttributeError:
            return
        aa_close(context)
        del self._context

    @property
    def render_width(self):
        '''Width of rendered image, in pixels.'''
        return self._render_width

    @property
    def render_height(self):
        '''Height of rendered image, in pixels.'''
        return self._render_height

    @property
    def render_size(self):
        '''Size of rendered image, in pixels.'''
        return self._render_width, self._render_height

    @property
    def virtual_width(self):
        '''Height of the virtual screen, in pixels.'''
        return self._virtual_width

    @property
    def virtual_height(self):
        '''Height of the virtual screen, in pixels.'''
        return self._virtual_height

    @property
    def virtual_size(self):
        '''Size of the virtual screen, in pixels.'''
        return self._virtual_width, self._virtual_height

    def __setitem__(self, xy, value):
        '''Put a pixel on the virtual screen.'''
        (x, y) = xy
        self._framebuffer[y * self._virtual_width + x] = value

    def put_image(self, xy, image):
        virtual_width = self._virtual_width
        virtual_height = self._virtual_height
        (x0, y0) = xy
        (image_width, image_height) = image.size
        for y in xrange(max(y0, 0), min(y0 + image_height, virtual_height)):
            p = y * virtual_width
            for x in xrange(max(x0, 0), min(x0 + image_width, virtual_width)):
                self._framebuffer[p + x] = image.getpixel((x - x0, y - y0))

    def __getitem__(self, xy):
        '''Get a pixel from the virtual screen.'''
        (x, y) = xy
        return self._framebuffer[y * self._virtual_width + x]

    def render(self, **kwargs):
        '''Render the image.

        Possible keyword arguments:
        - `brightness`,
        - `contrast`,
        - `gamma`,
        - `dithering_mode` (see `DITHER_*` constants),
        - `inversion`,
        - `random`.
        '''
        settings = DEFAULT_RENDER_SETTINGS.clone()
        for k, v in kwargs.iteritems():
            setattr(settings, k, v)
        context = self._context
        buffer = aa_image(context)
        if buffer is None:
            raise NoImageBuffer
        width, height = self._render_width, self._render_height
        aa_render(context, settings, 0, 0, width, height)
        text = aa_text(context)
        attrs = aa_attrs(context)
        return [
            [
                (chr(text[y * width + x]), attrs[y * width + x])
                for x in xrange(width)
            ]
            for y in xrange(height)
        ]

    def __del__(self):
        self.close()

class AsciiScreen(Screen):

    '''Pure ASCII screen.'''

    _formats = {ATTRIBUTE_NORMAL: '{s}'}

    def _get_default_settings(self):
        settings = Screen._get_default_settings(self)
        settings.options = OPTION_NORMAL_MASK
        return settings

    def render(self, **kwargs):
        raw = Screen.render(self, **kwargs)
        return '\n'.join(
            ''.join(self._formats[attr].format(s=ch) for (ch, attr) in line)
            for line in raw
        )
    render.__doc__ = Screen.render.__doc__

class AnsiScreen(AsciiScreen):

    '''Screen that uses ANSI escape sequences.'''

    _formats = {
        ATTRIBUTE_NORMAL: '{s}',
        ATTRIBUTE_BRIGHT: '\x1b[1m{s}\x1b[0m',
    }

    def _get_default_settings(self):
        settings = Screen._get_default_settings(self)
        settings.options = OPTION_NORMAL_MASK | OPTION_BRIGHT_MASK
        return settings

class LinuxScreen(AsciiScreen):

    '''Screen that uses Linux console escape sequences.'''

    _formats = {
        ATTRIBUTE_NORMAL: '{s}',
        ATTRIBUTE_BOLD: '\x1b[1m{s}\x1b[0m',
        ATTRIBUTE_DIM: '\x1b[30;1m{s}\x1b[0m',
        ATTRIBUTE_REVERSE: '\x1b[7m{s}\x1b[0m',
    }

    def _get_default_settings(self):
        settings = Screen._get_default_settings(self)
        settings.options = OPTION_NORMAL_MASK | OPTION_BOLD_MASK | OPTION_DIM_MASK | OPTION_REVERSE_MASK
        return settings

__all__ = (
    'AsciiScreen', 'AnsiScreen', 'LinuxScreen', 'ScreenInitializationFailed',
    'DITHER_NONE', 'DITHER_ERROR_DISTRIBUTION', 'DITHER_FLOYD_STEINBERG',
)

# vim:ts=4 sts=4 sw=4 et