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