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, URLOpener
  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             url = book_info.cover_url
 229             bg_src = None
 230             if image_cache:
 231                 from urllib import quote
 232                 try:
 233                     bg_src = URLOpener().open(image_cache + quote(url, safe=""))
 234                 except:
 235                     pass
 236             if bg_src is None:
 237                 bg_src = URLOpener().open(url)
 238             self.background_img = StringIO(bg_src.read())
 239             bg_src.close()
 240         else:
 241             self.background_img = self.default_background
 242
 243     def pretty_author(self):
 244         return self.author.upper()
 245
 246     def image(self):
 247         img = Image.new('RGB', (self.width, self.height), self.background_color)
 248         draw = ImageDraw.Draw(img)
 249
 250         if self.epoch in self.epoch_colors:
 251             epoch_color = self.epoch_colors[self.epoch]
 252         else:
 253             epoch_color = '#000'
 254         draw.rectangle((0, 0, self.bar_width, self.height), fill=epoch_color)
 255
 256         if self.background_img:
 257             src = Image.open(self.background_img)
 258             trg_size = (self.width - self.bar_width, self.height)
 259             if src.size[0] * trg_size[1] < src.size[1] * trg_size[0]:
 260                 resized = (
 261                     trg_size[0],
 262                     src.size[1] * trg_size[0] / src.size[0]
 263                 )
 264                 cut = (resized[1] - trg_size[1]) / 2
 265                 src = src.resize(resized)
 266                 src = src.crop((0, cut, src.size[0], src.size[1] - cut))
 267             else:
 268                 resized = (
 269                     src.size[0] * trg_size[1] / src.size[1],
 270                     trg_size[1],
 271                 )
 272                 cut = (resized[0] - trg_size[0]) / 2
 273                 src = src.resize(resized)
 274                 src = src.crop((cut, 0, src.size[0] - cut, src.size[1]))
 275
 276             img.paste(src, (self.bar_width, 0))
 277             del src
 278
 279         box = TextBox(self.title_box_width, self.height, padding_y=20)
 280         box.text(self.pretty_author(),
 281                  font=self.author_font,
 282                  line_height=self.author_lineskip,
 283                  color=self.author_color,
 284                  shadow_color=self.author_shadow,
 285                 )
 286
 287         box.skip(10)
 288         box.draw.line((75, box.height, 275, box.height),
 289                 fill=self.author_color, width=2)
 290         box.skip(15)
 291
 292         box.text(self.pretty_title(),
 293                  line_height=self.title_lineskip,
 294                  font=self.title_font,
 295                  color=epoch_color,
 296                  shadow_color=self.title_shadow,
 297                 )
 298         box_img = box.image()
 299
 300         if self.kind == 'Liryka':
 301             # top
 302             box_top = 100
 303         elif self.kind == 'Epika':
 304             # bottom
 305             box_top = self.height - 100 - box_img.size[1]
 306         else:
 307             # center
 308             box_top = (self.height - box_img.size[1]) / 2
 309
 310         box_left = self.bar_width + (self.width - self.bar_width -
 311                         box_img.size[0]) / 2
 312         draw.rectangle((box_left, box_top,
 313             box_left + box_img.size[0], box_top + box_img.size[1]),
 314             fill='#fff')
 315         img.paste(box_img, (box_left, box_top), box_img)
 316
 317         return img
 318
 319
 320
 321 class VirtualoCover(Cover):
 322     width = 600
 323     height = 730
 324     author_top = 73
 325     title_top = 73
 326     logo_bottom = 25
 327     logo_width = 250
 328
 329
 330 class PrestigioCover(Cover):
 331     width = 580
 332     height = 783
 333     background_img = get_resource('res/cover-prestigio.png')
 334
 335     author_top = 446
 336     author_margin_left = 118
 337     author_margin_right = 62
 338     author_lineskip = 60
 339     author_color = '#fff'
 340     author_shadow = '#000'
 341     author_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Italic.ttf'), 50)
 342
 343     title_top = 0
 344     title_margin_left = 118
 345     title_margin_right = 62
 346     title_lineskip = 60
 347     title_color = '#fff'
 348     title_shadow = '#000'
 349     title_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Italic.ttf'), 50)
 350
 351     def pretty_title(self):
 352         return u"„%s”" % self.title
 353
 354
 355 class BookotekaCover(Cover):
 356     width = 2140
 357     height = 2733
 358     background_img = get_resource('res/cover-bookoteka.png')
 359
 360     author_top = 480
 361     author_margin_left = 307
 362     author_margin_right = 233
 363     author_lineskip = 156
 364     author_color = '#d9d919'
 365     author_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 130)
 366
 367     title_top = 400
 368     title_margin_left = 307
 369     title_margin_right = 233
 370     title_lineskip = 168
 371     title_color = '#d9d919'
 372     title_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 140)
 373
 374     format = 'PNG'
 375
 376
 377 class GandalfCover(Cover):
 378     width = 600
 379     height = 730
 380     background_img = get_resource('res/cover-gandalf.png')
 381     author_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 30)
 382     title_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 40)
 383     logo_bottom = 25
 384     logo_width = 250
 385     format = 'PNG'