librarian/cover.py

   1 # -*- coding: utf-8 -*-
   2 #
   3 # This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
   4 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   5 #
   6 import Image, ImageFont, ImageDraw, ImageFilter
   7 from librarian import get_resource
   8
   9
  10 class TextBox(object):
  11     """Creates an Image with a series of centered strings."""
  12
  13     SHADOW_X = 3
  14     SHADOW_Y = 3
  15     SHADOW_BLUR = 3
  16
  17     def __init__(self, max_width, max_height, padding_x=None, padding_y=None):
  18         if padding_x is None:
  19             padding_x = self.SHADOW_X + self.SHADOW_BLUR
  20         if padding_y is None:
  21             padding_y = self.SHADOW_Y + self.SHADOW_BLUR
  22
  23         self.max_width = max_width
  24         self.max_text_width = max_width - 2 * padding_x
  25         self.padding_y = padding_y
  26         self.height = padding_y
  27         self.img = Image.new('RGBA', (max_width, max_height))
  28         self.draw = ImageDraw.Draw(self.img)
  29         self.shadow_img = None
  30         self.shadow_draw = None
  31
  32     def skip(self, height):
  33         """Skips some vertical space."""
  34         self.height += height
  35
  36     def text(self, text, color='#000', font=None, line_height=20,
  37              shadow_color=None, shortener=None):
  38         """Writes some centered text."""
  39         if shadow_color:
  40             if not self.shadow_img:
  41                 self.shadow_img = Image.new('RGBA', self.img.size)
  42                 self.shadow_draw = ImageDraw.Draw(self.shadow_img)
  43         while text:
  44             if shortener:
  45                 for line in shortener(text):
  46                     if text_draw.textsize(line, font=font)[0] <= self.max_text_width:
  47                         break
  48                 text = ''
  49             else:
  50                 line = text
  51                 line_width = self.draw.textsize(line, font=font)[0]
  52                 while line_width > self.max_text_width:
  53                     parts = line.rsplit(' ', 1)
  54                     if len(parts) == 1:
  55                         line_width = self.max_text_width
  56                         break
  57                     line = parts[0]
  58                     line_width = self.draw.textsize(line, font=font)[0]
  59
  60             line = line.strip() + ' '
  61
  62             pos_x = (self.max_width - line_width) / 2
  63
  64             if shadow_color:
  65                 self.shadow_draw.text(
  66                         (pos_x + self.SHADOW_X, self.height + self.SHADOW_Y),
  67                         line, font=font, fill=shadow_color
  68                 )
  69
  70             self.draw.text((pos_x, self.height), line, font=font, fill=color)
  71             self.height += line_height
  72             # go to next line
  73             text = text[len(line):]
  74
  75     @staticmethod
  76     def person_shortener(text):
  77         yield text
  78         chunks = text.split()
  79         n_chunks = len(chunks)
  80         # make initials from given names, starting from last
  81         for i in range(n_chunks - 2, -1, -1):
  82             chunks[i] = chunks[i][0] + '.'
  83             yield " ".join(chunks)
  84         # remove given names initials, starting from last
  85         while len(chunks) > 2:
  86             del chunks[1]
  87             yield " ".join(chunks)
  88
  89     @staticmethod
  90     def title_shortener(text):
  91         yield text
  92         chunks = text.split()
  93         n_chunks = len(chunks)
  94         # remove words, starting from last one
  95         while len(chunks) > 1:
  96             del chunks[-1]
  97             yield " ".join(chunks) + u'…'
  98
  99     def image(self):
 100         """Creates the actual Image object."""
 101         image = Image.new('RGBA', (self.max_width,
 102                                    self.height + self.padding_y))
 103         if self.shadow_img:
 104             shadow = self.shadow_img.filter(ImageFilter.BLUR)
 105             image.paste(shadow, (0, 0), shadow)
 106             image.paste(self.img, (0, 0), self.img)
 107         else:
 108             image.paste(self.img, (0, 0))
 109         return image
 110
 111
 112 class Cover(object):
 113     """Abstract base class for cover images generator."""
 114     width = 600
 115     height = 800
 116     background_color = '#fff'
 117     background_img = None
 118
 119     author_align = 'c'
 120     author_top = 100
 121     author_margin_left = 20
 122     author_margin_right = 20
 123     author_lineskip = 40
 124     author_color = '#000'
 125     author_shadow = None
 126     author_font = None
 127     author_wrap = True
 128
 129     title_align = 'c'
 130     title_top = 100
 131     title_margin_left = 20
 132     title_margin_right = 20
 133     title_lineskip = 54
 134     title_color = '#000'
 135     title_shadow = None
 136     title_font = None
 137     title_wrap = True
 138
 139     logo_bottom = None
 140     logo_width = None
 141     uses_dc_cover = False
 142
 143     format = 'JPEG'
 144
 145     exts = {
 146         'JPEG': 'jpg',
 147         'PNG': 'png',
 148         }
 149
 150     mime_types = {
 151         'JPEG': 'image/jpeg',
 152         'PNG': 'image/png',
 153         }
 154
 155     def __init__(self, book_info):
 156         self.author = ", ".join(auth.readable() for auth in book_info.authors)
 157         self.title = book_info.title
 158
 159     def pretty_author(self):
 160         """Allows for decorating author's name."""
 161         return self.author
 162
 163     def pretty_title(self):
 164         """Allows for decorating title."""
 165         return self.title
 166
 167     def image(self):
 168         img = Image.new('RGB', (self.width, self.height), self.background_color)
 169
 170         if self.background_img:
 171             background = Image.open(self.background_img)
 172             try:
 173                 img.paste(background, None, background)
 174             except ValueError, e:
 175                 img.paste(background)
 176             del background
 177
 178         # WL logo
 179         if self.logo_width:
 180             logo = Image.open(get_resource('res/wl-logo.png'))
 181             logo = logo.resize((self.logo_width, logo.size[1] * self.logo_width / logo.size[0]))
 182             img.paste(logo, ((self.width - self.logo_width) / 2, img.size[1] - logo.size[1] - self.logo_bottom))
 183
 184         top = self.author_top
 185         tbox = TextBox(
 186             self.width - self.author_margin_left - self.author_margin_right,
 187             self.height - top,
 188             )
 189         author_font = self.author_font or ImageFont.truetype(
 190             get_resource('fonts/DejaVuSerif.ttf'), 30)
 191         author_shortener = None if self.author_wrap else TextBox.person_shortener
 192         tbox.text(self.pretty_author(), self.author_color, author_font,
 193             self.author_lineskip, self.author_shadow, author_shortener)
 194         text_img = tbox.image()
 195         img.paste(text_img, (self.author_margin_left, top), text_img)
 196
 197         top += text_img.size[1] + self.title_top
 198         tbox = TextBox(
 199             self.width - self.title_margin_left - self.title_margin_right,
 200             self.height - top,
 201             )
 202         title_font = self.author_font or ImageFont.truetype(
 203             get_resource('fonts/DejaVuSerif.ttf'), 40)
 204         title_shortener = None if self.title_wrap else TextBox.title_shortener
 205         tbox.text(self.pretty_title(), self.title_color, title_font,
 206             self.title_lineskip, self.title_shadow, title_shortener)
 207         text_img = tbox.image()
 208         img.paste(text_img, (self.title_margin_left, top), text_img)
 209
 210         return img
 211
 212     def mime_type(self):
 213         return self.mime_types[self.format]
 214
 215     def ext(self):
 216         return self.exts[self.format]
 217
 218     def save(self, *args, **kwargs):
 219         return self.image().save(format=self.format, *args, **kwargs)
 220
 221
 222 class WLCover(Cover):
 223     """Default Wolne Lektury cover generator."""
 224     uses_dc_cover = True
 225     author_font = ImageFont.truetype(
 226         get_resource('fonts/JunicodeWL-Regular.ttf'), 20)
 227     author_lineskip = 30
 228     title_font = ImageFont.truetype(
 229         get_resource('fonts/DejaVuSerif-Bold.ttf'), 30)
 230     title_lineskip = 40
 231     title_box_width = 350
 232     bar_width = 35
 233     background_color = '#444'
 234     author_color = '#444'
 235     default_background = get_resource('res/cover.png')
 236     format = 'JPEG'
 237
 238     epochs = {
 239         u'Starożytność': 0,
 240         u'Średniowiecze': 30,
 241         u'Renesans': 60,
 242         u'Barok': 90,
 243         u'Oświecenie': 120,
 244         u'Romantyzm': 150,
 245         u'Pozytywizm': 180,
 246         u'Modernizm': 210,
 247         u'Dwudziestolecie międzywojenne': 240,
 248         u'Współczesność': 270,
 249     }
 250
 251     def __init__(self, book_info):
 252         super(WLCover, self).__init__(book_info)
 253         self.kind = book_info.kind
 254         self.epoch = book_info.epoch
 255         if book_info.cover_url:
 256             from urllib2 import urlopen
 257             from StringIO import StringIO
 258
 259             bg_src = urlopen(book_info.cover_url)
 260             self.background_img = StringIO(bg_src.read())
 261             bg_src.close()
 262         else:
 263             self.background_img = self.default_background
 264
 265     def pretty_author(self):
 266         return self.author.upper()
 267
 268     def image(self):
 269         from colorsys import hsv_to_rgb
 270
 271         img = Image.new('RGB', (self.width, self.height), self.background_color)
 272         draw = ImageDraw.Draw(img)
 273
 274         if self.epoch in self.epochs:
 275             epoch_color = tuple(int(255 * c) for c in hsv_to_rgb(
 276                     float(self.epochs[self.epoch]) / 360, .7, .7))
 277         else:
 278             epoch_color = '#000'
 279         draw.rectangle((0, 0, self.bar_width, self.height), fill=epoch_color)
 280
 281         if self.background_img:
 282             src = Image.open(self.background_img)
 283             trg_size = (self.width - self.bar_width, self.height)
 284             if src.size[0] * trg_size[1] < src.size[1] * trg_size[0]:
 285                 resized = (
 286                     trg_size[0],
 287                     src.size[1] * trg_size[0] / src.size[0]
 288                 )
 289                 cut = (resized[1] - trg_size[1]) / 2
 290                 src = src.resize(resized)
 291                 src = src.crop((0, cut, src.size[0], src.size[1] - cut))
 292             else:
 293                 resized = (
 294                     src.size[0] * trg_size[1] / src.size[1],
 295                     trg_size[1],
 296                 )
 297                 cut = (resized[0] - trg_size[0]) / 2
 298                 src = src.resize(resized)
 299                 src = src.crop((cut, 0, src.size[0] - cut, src.size[1]))
 300
 301             img.paste(src, (self.bar_width, 0))
 302             del src
 303
 304         box = TextBox(self.title_box_width, self.height, padding_y=20)
 305         box.text(self.pretty_author(),
 306                  font=self.author_font,
 307                  line_height=self.author_lineskip,
 308                  color=self.author_color,
 309                  shadow_color=self.author_shadow,
 310                 )
 311
 312         box.skip(10)
 313         box.draw.line((75, box.height, 275, box.height),
 314                 fill=self.author_color, width=2)
 315         box.skip(15)
 316
 317         box.text(self.pretty_title(),
 318                  line_height=self.title_lineskip,
 319                  font=self.title_font,
 320                  color=epoch_color,
 321                  shadow_color=self.title_shadow,
 322                 )
 323         box_img = box.image()
 324
 325         if self.kind == 'Liryka':
 326             # top
 327             box_top = 100
 328         elif self.kind == 'Epika':
 329             # bottom
 330             box_top = self.height - 100 - box_img.size[1]
 331         else:
 332             # center
 333             box_top = (self.height - box_img.size[1]) / 2
 334
 335         box_left = self.bar_width + (self.width - self.bar_width -
 336                         box_img.size[0]) / 2
 337         draw.rectangle((box_left, box_top,
 338             box_left + box_img.size[0], box_top + box_img.size[1]),
 339             fill='#fff')
 340         img.paste(box_img, (box_left, box_top), box_img)
 341
 342         return img
 343
 344
 345
 346 class VirtualoCover(Cover):
 347     width = 600
 348     height = 730
 349     author_top = 73
 350     title_top = 73
 351     logo_bottom = 25
 352     logo_width = 250
 353
 354
 355 class PrestigioCover(Cover):
 356     width = 580
 357     height = 783
 358     background_img = get_resource('res/cover-prestigio.png')
 359
 360     author_top = 446
 361     author_margin_left = 118
 362     author_margin_right = 62
 363     author_lineskip = 60
 364     author_color = '#fff'
 365     author_shadow = '#000'
 366     author_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Italic.ttf'), 50)
 367
 368     title_top = 0
 369     title_margin_left = 118
 370     title_margin_right = 62
 371     title_lineskip = 60
 372     title_color = '#fff'
 373     title_shadow = '#000'
 374     title_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Italic.ttf'), 50)
 375
 376     def pretty_title(self):
 377         return u"„%s”" % self.title
 378
 379
 380 class BookotekaCover(Cover):
 381     width = 2140
 382     height = 2733
 383     background_img = get_resource('res/cover-bookoteka.png')
 384
 385     author_top = 480
 386     author_margin_left = 307
 387     author_margin_right = 233
 388     author_lineskip = 156
 389     author_color = '#d9d919'
 390     author_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 130)
 391
 392     title_top = 400
 393     title_margin_left = 307
 394     title_margin_right = 233
 395     title_lineskip = 168
 396     title_color = '#d9d919'
 397     title_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 140)
 398
 399     format = 'PNG'
 400
 401
 402 class GandalfCover(Cover):
 403     width = 600
 404     height = 730
 405     background_img = get_resource('res/cover-gandalf.png')
 406     author_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 30)
 407     title_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 40)
 408     logo_bottom = 25
 409     logo_width = 250
 410     format = 'PNG'
 411
 412
 413 class ArtaTechCover(Cover):
 414     width = 600
 415     height = 800
 416     background_img = get_resource('res/cover-arta-tech.jpg')
 417     author_top = 132
 418     author_margin_left = 235
 419     author_margin_right = 23
 420     author_align = 'r'
 421     author_font = ImageFont.truetype(get_resource('fonts/DroidSans.ttf'), 32)
 422     author_color = '#555555'
 423     author_wrap = False
 424     title_top = 17
 425     title_margin_right = 21
 426     title_margin_left = 60
 427     title_align = 'r'
 428     title_font = ImageFont.truetype(get_resource('fonts/EBGaramond-Regular.ttf'), 42)
 429     title_color = '#222222'
 430     title_wrap = False
 431     format = 'JPEG'
 432
 433     def pretty_author(self):
 434         return self.author.upper()
 435
 436
 437 def ImageCover(img):
 438     """ a class factory for simple image covers """
 439     img = Image.open(img)
 440
 441     class ImgCover(Cover):
 442         def image(self):
 443             return img
 444
 445         @property
 446         def format(self):
 447             return self.image().format
 448
 449     return ImgCover