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 re
   7 import Image, ImageFont, ImageDraw, ImageFilter
   8 from StringIO import StringIO
   9 from librarian import get_resource, OutputFile
  10
  11
  12 class TextBox(object):
  13     """Creates an Image with a series of centered strings."""
  14
  15     SHADOW_X = 3
  16     SHADOW_Y = 3
  17     SHADOW_BLUR = 3
  18
  19     def __init__(self, max_width, max_height, padding_x=None, padding_y=None):
  20         if padding_x is None:
  21             padding_x = self.SHADOW_X + self.SHADOW_BLUR
  22         if padding_y is None:
  23             padding_y = self.SHADOW_Y + self.SHADOW_BLUR
  24
  25         self.max_width = max_width
  26         self.max_text_width = max_width - 2 * padding_x
  27         self.padding_y = padding_y
  28         self.height = padding_y
  29         self.img = Image.new('RGBA', (max_width, max_height))
  30         self.draw = ImageDraw.Draw(self.img)
  31         self.shadow_img = None
  32         self.shadow_draw = None
  33
  34     def skip(self, height):
  35         """Skips some vertical space."""
  36         self.height += height
  37
  38     def text(self, text, color='#000', font=None, line_height=20,
  39              shadow_color=None):
  40         """Writes some centered text."""
  41         text = re.sub(r'\s+', ' ', text)
  42         if shadow_color:
  43             if not self.shadow_img:
  44                 self.shadow_img = Image.new('RGBA', self.img.size)
  45                 self.shadow_draw = ImageDraw.Draw(self.shadow_img)
  46         while text:
  47             line = text
  48             line_width = self.draw.textsize(line, font=font)[0]
  49             while line_width > self.max_text_width:
  50                 parts = line.rsplit(' ', 1)
  51                 if len(parts) == 1:
  52                     line_width = self.max_text_width
  53                     break
  54                 line = parts[0]
  55                 line_width = self.draw.textsize(line, font=font)[0]
  56             line = line.strip() + ' '
  57
  58             pos_x = (self.max_width - line_width) / 2
  59
  60             if shadow_color:
  61                 self.shadow_draw.text(
  62                         (pos_x + self.SHADOW_X, self.height + self.SHADOW_Y),
  63                         line, font=font, fill=shadow_color
  64                 )
  65
  66             self.draw.text((pos_x, self.height), line, font=font, fill=color)
  67             self.height += line_height
  68             # go to next line
  69             text = text[len(line):]
  70
  71     def image(self):
  72         """Creates the actual Image object."""
  73         image = Image.new('RGBA', (self.max_width,
  74                                    self.height + self.padding_y))
  75         if self.shadow_img:
  76             shadow = self.shadow_img.filter(ImageFilter.BLUR)
  77             image.paste(shadow, (0, 0), shadow)
  78             image.paste(self.img, (0, 0), self.img)
  79         else:
  80             image.paste(self.img, (0, 0))
  81         return image
  82
  83
  84 class Cover(object):
  85     """Abstract base class for cover images generator."""
  86     width = 600
  87     height = 800
  88     background_color = '#fff'
  89     background_img = None
  90
  91     author_top = 100
  92     author_margin_left = 20
  93     author_margin_right = 20
  94     author_lineskip = 40
  95     author_color = '#000'
  96     author_shadow = None
  97     author_font = None
  98
  99     title_top = 100
 100     title_margin_left = 20
 101     title_margin_right = 20
 102     title_lineskip = 54
 103     title_color = '#000'
 104     title_shadow = None
 105     title_font = None
 106
 107     logo_bottom = None
 108     logo_width = None
 109     uses_dc_cover = False
 110
 111     format = 'JPEG'
 112
 113     exts = {
 114         'JPEG': 'jpg',
 115         'PNG': 'png',
 116         }
 117
 118     mime_types = {
 119         'JPEG': 'image/jpeg',
 120         'PNG': 'image/png',
 121         }
 122
 123     def __init__(self, book_info, format=None):
 124         self.author = ", ".join(auth.readable() for auth in book_info.authors)
 125         self.title = book_info.title
 126         if format is not None:
 127             self.format = format
 128
 129     def pretty_author(self):
 130         """Allows for decorating author's name."""
 131         return self.author
 132
 133     def pretty_title(self):
 134         """Allows for decorating title."""
 135         return self.title
 136
 137     def image(self):
 138         img = Image.new('RGB', (self.width, self.height), self.background_color)
 139
 140         if self.background_img:
 141             background = Image.open(self.background_img)
 142             img.paste(background, None, background)
 143             del background
 144
 145         # WL logo
 146         if self.logo_width:
 147             logo = Image.open(get_resource('res/wl-logo.png'))
 148             logo = logo.resize((self.logo_width, logo.size[1] * self.logo_width / logo.size[0]))
 149             img.paste(logo, ((self.width - self.logo_width) / 2, img.size[1] - logo.size[1] - self.logo_bottom))
 150
 151         top = self.author_top
 152         tbox = TextBox(
 153             self.width - self.author_margin_left - self.author_margin_right,
 154             self.height - top,
 155             )
 156         author_font = self.author_font or ImageFont.truetype(
 157             get_resource('fonts/DejaVuSerif.ttf'), 30)
 158         tbox.text(self.pretty_author(), self.author_color, author_font,
 159             self.author_lineskip, self.author_shadow)
 160         text_img = tbox.image()
 161         img.paste(text_img, (self.author_margin_left, top), text_img)
 162
 163         top += text_img.size[1] + self.title_top
 164         tbox = TextBox(
 165             self.width - self.title_margin_left - self.title_margin_right,
 166             self.height - top,
 167             )
 168         title_font = self.author_font or ImageFont.truetype(
 169             get_resource('fonts/DejaVuSerif.ttf'), 40)
 170         tbox.text(self.pretty_title(), self.title_color, title_font,
 171             self.title_lineskip, self.title_shadow)
 172         text_img = tbox.image()
 173         img.paste(text_img, (self.title_margin_left, top), text_img)
 174
 175         return img
 176
 177     def mime_type(self):
 178         return self.mime_types[self.format]
 179
 180     def ext(self):
 181         return self.exts[self.format]
 182
 183     def save(self, *args, **kwargs):
 184         return self.image().save(format=self.format, *args, **kwargs)
 185
 186     def output_file(self, *args, **kwargs):
 187         imgstr = StringIO()
 188         self.save(imgstr, *args, **kwargs)
 189         return OutputFile.from_string(imgstr.getvalue())
 190
 191
 192 class WLCover(Cover):
 193     """Default Wolne Lektury cover generator."""
 194     width = 600
 195     height = 833
 196     uses_dc_cover = True
 197     author_font = ImageFont.truetype(
 198         get_resource('fonts/JunicodeWL-Regular.ttf'), 20)
 199     author_lineskip = 30
 200     title_font = ImageFont.truetype(
 201         get_resource('fonts/DejaVuSerif-Bold.ttf'), 30)
 202     title_lineskip = 40
 203     title_box_width = 350
 204     bar_width = 35
 205     background_color = '#444'
 206     author_color = '#444'
 207     default_background = get_resource('res/cover.png')
 208     format = 'JPEG'
 209
 210     epoch_colors = {
 211         u'Starożytność': '#9e3610',
 212         u'Średniowiecze': '#564c09',
 213         u'Renesans': '#8ca629',
 214         u'Barok': '#a6820a',
 215         u'Oświecenie': '#f2802e',
 216         u'Romantyzm': '#db4b16',
 217         u'Pozytywizm': '#961060',
 218         u'Modernizm': '#7784e0',
 219         u'Dwudziestolecie międzywojenne': '#3044cf',
 220         u'Współczesność': '#06393d',
 221     }
 222
 223     def __init__(self, book_info, format=None, image_cache=None):
 224         super(WLCover, self).__init__(book_info, format=format)
 225         self.kind = book_info.kind
 226         self.epoch = book_info.epoch
 227         if book_info.cover_url:
 228             from urllib2 import urlopen
 229             from StringIO import StringIO
 230
 231             url = book_info.cover_url
 232             bg_src = None
 233             if image_cache:
 234                 from urllib import quote
 235                 try:
 236                     bg_src = urlopen(image_cache + quote(url, safe=""))
 237                 except:
 238                     pass
 239             if bg_src is None:
 240                 bg_src = urlopen(url)
 241             self.background_img = StringIO(bg_src.read())
 242             bg_src.close()
 243         else:
 244             self.background_img = self.default_background
 245
 246     def pretty_author(self):
 247         return self.author.upper()
 248
 249     def image(self):
 250         img = Image.new('RGB', (self.width, self.height), self.background_color)
 251         draw = ImageDraw.Draw(img)
 252
 253         if self.epoch in self.epoch_colors:
 254             epoch_color = self.epoch_colors[self.epoch]
 255         else:
 256             epoch_color = '#000'
 257         draw.rectangle((0, 0, self.bar_width, self.height), fill=epoch_color)
 258
 259         if self.background_img:
 260             src = Image.open(self.background_img)
 261             trg_size = (self.width - self.bar_width, self.height)
 262             if src.size[0] * trg_size[1] < src.size[1] * trg_size[0]:
 263                 resized = (
 264                     trg_size[0],
 265                     src.size[1] * trg_size[0] / src.size[0]
 266                 )
 267                 cut = (resized[1] - trg_size[1]) / 2
 268                 src = src.resize(resized)
 269                 src = src.crop((0, cut, src.size[0], src.size[1] - cut))
 270             else:
 271                 resized = (
 272                     src.size[0] * trg_size[1] / src.size[1],
 273                     trg_size[1],
 274                 )
 275                 cut = (resized[0] - trg_size[0]) / 2
 276                 src = src.resize(resized)
 277                 src = src.crop((cut, 0, src.size[0] - cut, src.size[1]))
 278
 279             img.paste(src, (self.bar_width, 0))
 280             del src
 281
 282         box = TextBox(self.title_box_width, self.height, padding_y=20)
 283         box.text(self.pretty_author(),
 284                  font=self.author_font,
 285                  line_height=self.author_lineskip,
 286                  color=self.author_color,
 287                  shadow_color=self.author_shadow,
 288                 )
 289
 290         box.skip(10)
 291         box.draw.line((75, box.height, 275, box.height),
 292                 fill=self.author_color, width=2)
 293         box.skip(15)
 294
 295         box.text(self.pretty_title(),
 296                  line_height=self.title_lineskip,
 297                  font=self.title_font,
 298                  color=epoch_color,
 299                  shadow_color=self.title_shadow,
 300                 )
 301         box_img = box.image()
 302
 303         if self.kind == 'Liryka':
 304             # top
 305             box_top = 100
 306         elif self.kind == 'Epika':
 307             # bottom
 308             box_top = self.height - 100 - box_img.size[1]
 309         else:
 310             # center
 311             box_top = (self.height - box_img.size[1]) / 2
 312
 313         box_left = self.bar_width + (self.width - self.bar_width -
 314                         box_img.size[0]) / 2
 315         draw.rectangle((box_left, box_top,
 316             box_left + box_img.size[0], box_top + box_img.size[1]),
 317             fill='#fff')
 318         img.paste(box_img, (box_left, box_top), box_img)
 319
 320         return img
 321
 322
 323
 324 class VirtualoCover(Cover):
 325     width = 600
 326     height = 730
 327     author_top = 73
 328     title_top = 73
 329     logo_bottom = 25
 330     logo_width = 250
 331
 332
 333 class PrestigioCover(Cover):
 334     width = 580
 335     height = 783
 336     background_img = get_resource('res/cover-prestigio.png')
 337
 338     author_top = 446
 339     author_margin_left = 118
 340     author_margin_right = 62
 341     author_lineskip = 60
 342     author_color = '#fff'
 343     author_shadow = '#000'
 344     author_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Italic.ttf'), 50)
 345
 346     title_top = 0
 347     title_margin_left = 118
 348     title_margin_right = 62
 349     title_lineskip = 60
 350     title_color = '#fff'
 351     title_shadow = '#000'
 352     title_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Italic.ttf'), 50)
 353
 354     def pretty_title(self):
 355         return u"„%s”" % self.title
 356
 357
 358 class BookotekaCover(Cover):
 359     width = 2140
 360     height = 2733
 361     background_img = get_resource('res/cover-bookoteka.png')
 362
 363     author_top = 480
 364     author_margin_left = 307
 365     author_margin_right = 233
 366     author_lineskip = 156
 367     author_color = '#d9d919'
 368     author_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 130)
 369
 370     title_top = 400
 371     title_margin_left = 307
 372     title_margin_right = 233
 373     title_lineskip = 168
 374     title_color = '#d9d919'
 375     title_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 140)
 376
 377     format = 'PNG'
 378
 379
 380 class GandalfCover(Cover):
 381     width = 600
 382     height = 730
 383     background_img = get_resource('res/cover-gandalf.png')
 384     author_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 30)
 385     title_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 40)
 386     logo_bottom = 25
 387     logo_width = 250
 388     format = 'PNG'