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