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 from PIL import Image, ImageFont, ImageDraw, ImageFilter, ImageEnhance
   8 from StringIO import StringIO
   9 from librarian import get_resource, OutputFile, URLOpener
  10
  11
  12 class Metric(object):
  13     """Gets metrics from an object, scaling it by a factor."""
  14     def __init__(self, obj, scale):
  15         self._obj = obj
  16         self._scale = float(scale)
  17
  18     def __getattr__(self, name):
  19         src = getattr(self._obj, name)
  20         if src and self._scale:
  21             src = type(src)(self._scale * src)
  22         return src
  23
  24
  25 class TextBox(object):
  26     """Creates an Image with a series of centered strings."""
  27
  28     SHADOW_X = 3
  29     SHADOW_Y = 3
  30     SHADOW_BLUR = 3
  31
  32     def __init__(self, max_width, max_height, padding_x=None, padding_y=None):
  33         if padding_x is None:
  34             padding_x = self.SHADOW_X + self.SHADOW_BLUR
  35         if padding_y is None:
  36             padding_y = self.SHADOW_Y + self.SHADOW_BLUR
  37
  38         self.max_width = max_width
  39         self.max_text_width = max_width - 2 * padding_x
  40         self.padding_y = padding_y
  41         self.height = padding_y
  42         self.img = Image.new('RGBA', (max_width, max_height))
  43         self.draw = ImageDraw.Draw(self.img)
  44         self.shadow_img = None
  45         self.shadow_draw = None
  46
  47     def skip(self, height):
  48         """Skips some vertical space."""
  49         self.height += height
  50
  51     def text(self, text, color='#000', font=None, line_height=20,
  52              shadow_color=None):
  53         """Writes some centered text."""
  54         text = re.sub(r'\s+', ' ', text)
  55         if shadow_color:
  56             if not self.shadow_img:
  57                 self.shadow_img = Image.new('RGBA', self.img.size)
  58                 self.shadow_draw = ImageDraw.Draw(self.shadow_img)
  59         while text:
  60             line = text
  61             line_width = self.draw.textsize(line, font=font)[0]
  62             while line_width > self.max_text_width:
  63                 parts = line.rsplit(' ', 1)
  64                 if len(parts) == 1:
  65                     line_width = self.max_text_width
  66                     break
  67                 line = parts[0]
  68                 line_width = self.draw.textsize(line, font=font)[0]
  69             line = line.strip() + ' '
  70
  71             pos_x = (self.max_width - line_width) / 2
  72
  73             if shadow_color:
  74                 self.shadow_draw.text(
  75                         (pos_x + self.SHADOW_X, self.height + self.SHADOW_Y),
  76                         line, font=font, fill=shadow_color
  77                 )
  78
  79             self.draw.text((pos_x, self.height), line, font=font, fill=color)
  80             self.height += line_height
  81             # go to next line
  82             text = text[len(line):]
  83
  84     def image(self):
  85         """Creates the actual Image object."""
  86         image = Image.new('RGBA', (self.max_width,
  87                                    self.height + self.padding_y))
  88         if self.shadow_img:
  89             shadow = self.shadow_img.filter(ImageFilter.BLUR)
  90             image.paste(shadow, (0, 0), shadow)
  91             image.paste(self.img, (0, 0), self.img)
  92         else:
  93             image.paste(self.img, (0, 0))
  94         return image
  95
  96
  97 class Cover(object):
  98     """Abstract base class for cover images generator."""
  99     width = 600
 100     height = 800
 101     background_color = '#fff'
 102     background_img = None
 103
 104     author_top = 100
 105     author_margin_left = 20
 106     author_margin_right = 20
 107     author_lineskip = 40
 108     author_color = '#000'
 109     author_shadow = None
 110     author_font_ttf = get_resource('fonts/DejaVuSerif.ttf')
 111     author_font_size = 30
 112
 113     title_top = 100
 114     title_margin_left = 20
 115     title_margin_right = 20
 116     title_lineskip = 54
 117     title_color = '#000'
 118     title_shadow = None
 119     title_font_ttf = get_resource('fonts/DejaVuSerif.ttf')
 120     title_font_size = 40
 121
 122     logo_bottom = None
 123     logo_width = None
 124     uses_dc_cover = False
 125
 126     format = 'JPEG'
 127     scale = 1
 128     scale_after = 1
 129
 130     exts = {
 131         'JPEG': 'jpg',
 132         'PNG': 'png',
 133         }
 134
 135     mime_types = {
 136         'JPEG': 'image/jpeg',
 137         'PNG': 'image/png',
 138         }
 139
 140     def __init__(self, book_info, format=None, width=None, height=None):
 141         self.author = ", ".join(auth.readable() for auth in book_info.authors)
 142         self.title = book_info.title
 143         if format is not None:
 144             self.format = format
 145         scale = max(float(width or 0) / self.width, float(height or 0) / self.height)
 146         if scale >= 1:
 147             self.scale = scale
 148         elif scale:
 149             self.scale_after = scale
 150
 151     def pretty_author(self):
 152         """Allows for decorating author's name."""
 153         return self.author
 154
 155     def pretty_title(self):
 156         """Allows for decorating title."""
 157         return self.title
 158
 159     def image(self):
 160         metr = Metric(self, self.scale)
 161         img = Image.new('RGB', (metr.width, metr.height), self.background_color)
 162
 163         if self.background_img:
 164             background = Image.open(self.background_img)
 165             img.paste(background, None, background)
 166             del background
 167
 168         # WL logo
 169         if metr.logo_width:
 170             logo = Image.open(get_resource('res/wl-logo.png'))
 171             logo = logo.resize((metr.logo_width, logo.size[1] * metr.logo_width / logo.size[0]))
 172             img.paste(logo, ((metr.width - metr.logo_width) / 2, img.size[1] - logo.size[1] - metr.logo_bottom))
 173
 174         top = metr.author_top
 175         tbox = TextBox(
 176             metr.width - metr.author_margin_left - metr.author_margin_right,
 177             metr.height - top,
 178             )
 179
 180         author_font = ImageFont.truetype(
 181             self.author_font_ttf, metr.author_font_size)
 182         tbox.text(self.pretty_author(), self.author_color, author_font,
 183             metr.author_lineskip, self.author_shadow)
 184         text_img = tbox.image()
 185         img.paste(text_img, (metr.author_margin_left, top), text_img)
 186
 187         top += text_img.size[1] + metr.title_top
 188         tbox = TextBox(
 189             metr.width - metr.title_margin_left - metr.title_margin_right,
 190             metr.height - top,
 191             )
 192         title_font = ImageFont.truetype(
 193             self.title_font_ttf, metr.title_font_size)
 194         tbox.text(self.pretty_title(), self.title_color, title_font,
 195             metr.title_lineskip, self.title_shadow)
 196         text_img = tbox.image()
 197         img.paste(text_img, (metr.title_margin_left, top), text_img)
 198
 199         return img
 200
 201     def final_image(self):
 202         img = self.image()
 203         if self.scale_after != 1:
 204             img = img.resize((
 205                     int(round(img.size[0] * self.scale_after)),
 206                     int(round(img.size[1] * self.scale_after))),
 207                 Image.ANTIALIAS)
 208         return img
 209
 210     def mime_type(self):
 211         return self.mime_types[self.format]
 212
 213     def ext(self):
 214         return self.exts[self.format]
 215
 216     def save(self, *args, **kwargs):
 217         return self.final_image().save(format=self.format, quality=95, *args, **kwargs)
 218
 219     def output_file(self, *args, **kwargs):
 220         imgstr = StringIO()
 221         self.save(imgstr, *args, **kwargs)
 222         return OutputFile.from_string(imgstr.getvalue())
 223
 224
 225 class WLCover(Cover):
 226     """Wolne Lektury cover without logos."""
 227     width = 600
 228     height = 833
 229     uses_dc_cover = True
 230     author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 231     author_font_size = 20
 232     author_lineskip = 30
 233     title_font_ttf = get_resource('fonts/DejaVuSerif-Bold.ttf')
 234     title_font_size = 30
 235     title_lineskip = 40
 236     title_box_width = 350
 237
 238     box_top_margin = 100
 239     box_bottom_margin = 100
 240     box_padding_y = 20
 241     box_above_line = 10
 242     box_below_line = 15
 243     box_line_left = 75
 244     box_line_right = 275
 245     box_line_width = 2
 246
 247     logo_top = 15
 248     logo_width = 140
 249
 250     bar_width = 35
 251     background_color = '#444'
 252     author_color = '#444'
 253     default_background = get_resource('res/cover.png')
 254     format = 'JPEG'
 255
 256     epoch_colors = {
 257         u'Starożytność': '#9e3610',
 258         u'Średniowiecze': '#564c09',
 259         u'Renesans': '#8ca629',
 260         u'Barok': '#a6820a',
 261         u'Oświecenie': '#f2802e',
 262         u'Romantyzm': '#db4b16',
 263         u'Pozytywizm': '#961060',
 264         u'Modernizm': '#7784e0',
 265         u'Dwudziestolecie międzywojenne': '#3044cf',
 266         u'Współczesność': '#06393d',
 267     }
 268
 269     def __init__(self, book_info, format=None, width=None, height=None, with_logo=False):
 270         super(WLCover, self).__init__(book_info, format=format, width=width, height=height)
 271         self.kind = book_info.kind
 272         self.epoch = book_info.epoch
 273         self.with_logo = with_logo
 274         if book_info.cover_url:
 275             url = book_info.cover_url
 276             bg_src = None
 277             if bg_src is None:
 278                 bg_src = URLOpener().open(url)
 279             self.background_img = StringIO(bg_src.read())
 280             bg_src.close()
 281         else:
 282             self.background_img = self.default_background
 283
 284     def pretty_author(self):
 285         return self.author.upper()
 286
 287     def image(self):
 288         metr = Metric(self, self.scale)
 289         img = Image.new('RGB', (metr.width, metr.height), self.background_color)
 290         draw = ImageDraw.Draw(img)
 291
 292         if self.epoch in self.epoch_colors:
 293             epoch_color = self.epoch_colors[self.epoch]
 294         else:
 295             epoch_color = '#000'
 296         draw.rectangle((0, 0, metr.bar_width, metr.height), fill=epoch_color)
 297
 298         if self.background_img:
 299             src = Image.open(self.background_img)
 300             trg_size = (metr.width - metr.bar_width, metr.height)
 301             if src.size[0] * trg_size[1] < src.size[1] * trg_size[0]:
 302                 resized = (
 303                     trg_size[0],
 304                     src.size[1] * trg_size[0] / src.size[0]
 305                 )
 306                 cut = (resized[1] - trg_size[1]) / 2
 307                 src = src.resize(resized, Image.ANTIALIAS)
 308                 src = src.crop((0, cut, src.size[0], src.size[1] - cut))
 309             else:
 310                 resized = (
 311                     src.size[0] * trg_size[1] / src.size[1],
 312                     trg_size[1],
 313                 )
 314                 cut = (resized[0] - trg_size[0]) / 2
 315                 src = src.resize(resized, Image.ANTIALIAS)
 316                 src = src.crop((cut, 0, src.size[0] - cut, src.size[1]))
 317
 318             img.paste(src, (metr.bar_width, 0))
 319             del src
 320
 321         box = TextBox(metr.title_box_width, metr.height, padding_y=metr.box_padding_y)
 322         author_font = ImageFont.truetype(
 323             self.author_font_ttf, metr.author_font_size)
 324         box.text(self.pretty_author(),
 325                  font=author_font,
 326                  line_height=metr.author_lineskip,
 327                  color=self.author_color,
 328                  shadow_color=self.author_shadow,
 329                 )
 330
 331         box.skip(metr.box_above_line)
 332         box.draw.line((metr.box_line_left, box.height, metr.box_line_right, box.height),
 333                 fill=self.author_color, width=metr.box_line_width)
 334         box.skip(metr.box_below_line)
 335
 336         title_font = ImageFont.truetype(
 337             self.title_font_ttf, metr.title_font_size)
 338         box.text(self.pretty_title(),
 339                  line_height=metr.title_lineskip,
 340                  font=title_font,
 341                  color=epoch_color,
 342                  shadow_color=self.title_shadow,
 343                 )
 344
 345         if self.with_logo:
 346             logo = Image.open(get_resource('res/wl-logo-mono.png'))
 347             logo = logo.resize((metr.logo_width, logo.size[1] * metr.logo_width / logo.size[0]), Image.ANTIALIAS)
 348             alpha = logo.split()[3]
 349             alpha = ImageEnhance.Brightness(alpha).enhance(.75)
 350             logo.putalpha(alpha)
 351             box.skip(metr.logo_top + logo.size[1])
 352
 353         box_img = box.image()
 354
 355         if self.kind == 'Liryka':
 356             # top
 357             box_top = metr.box_top_margin
 358         elif self.kind == 'Epika':
 359             # bottom
 360             box_top = metr.height - metr.box_bottom_margin - box_img.size[1]
 361         else:
 362             # center
 363             box_top = (metr.height - box_img.size[1]) / 2
 364
 365         box_left = metr.bar_width + (metr.width - metr.bar_width -
 366                         box_img.size[0]) / 2
 367         draw.rectangle((box_left, box_top,
 368             box_left + box_img.size[0], box_top + box_img.size[1]),
 369             fill='#fff')
 370         img.paste(box_img, (box_left, box_top), box_img)
 371
 372         if self.with_logo:
 373             img.paste(logo,
 374                 (box_left + (box_img.size[0] - logo.size[0]) / 2,
 375                     box_top + box_img.size[1] - metr.box_padding_y - logo.size[1]), mask=logo)
 376
 377         return img
 378
 379
 380 class LogoWLCover(WLCover):
 381     gradient_height = 90
 382     gradient_logo_height = 60
 383     gradient_logo_margin_right = 30
 384     gradient_logo_spacing = 40
 385     gradient_color = '#000'
 386     gradient_opacity = .6
 387     gradient_logos = [
 388         'res/wl-logo-white.png',
 389         'res/fnp-logo-white.png',
 390     ]
 391
 392     def image(self):
 393         img = super(LogoWLCover, self).image()
 394         metr = Metric(self, self.scale)
 395         gradient = Image.new('RGBA', (metr.width - metr.bar_width, metr.gradient_height), self.gradient_color)
 396         gradient_mask = Image.new('L', (metr.width - metr.bar_width, metr.gradient_height))
 397         draw = ImageDraw.Draw(gradient_mask)
 398         for line in range(0, metr.gradient_height):
 399             draw.line((0, line, metr.width - metr.bar_width, line), fill=int(255 * self.gradient_opacity * line / metr.gradient_height))
 400         img.paste(gradient,
 401             (metr.bar_width, metr.height - metr.gradient_height), mask=gradient_mask)
 402
 403         cursor = metr.width - metr.gradient_logo_margin_right
 404         logo_top = metr.height - metr.gradient_height / 2  - metr.gradient_logo_height / 2
 405         for logo_path in self.gradient_logos[::-1]:
 406             logo = Image.open(get_resource(logo_path))
 407             logo = logo.resize(
 408                 (logo.size[0] * metr.gradient_logo_height / logo.size[1], metr.gradient_logo_height),
 409                 Image.ANTIALIAS)
 410             cursor -= logo.size[0]
 411             img.paste(logo, (cursor, logo_top), mask=logo)
 412             cursor -= metr.gradient_logo_spacing
 413
 414         return img
 415
 416
 417 class EbookpointCover(LogoWLCover):
 418     gradient_logo_height = 58
 419     gradient_logo_spacing = 25
 420     gradient_logos = [
 421         'res/ebookpoint-logo-white.png',
 422         'res/wl-logo-white.png',
 423         'res/fnp-logo-white.png',
 424     ]
 425
 426
 427 class VirtualoCover(Cover):
 428     width = 600
 429     height = 730
 430     author_top = 73
 431     title_top = 73
 432     logo_bottom = 25
 433     logo_width = 250
 434
 435
 436 class PrestigioCover(Cover):
 437     width = 580
 438     height = 783
 439     background_img = get_resource('res/cover-prestigio.png')
 440
 441     author_top = 446
 442     author_margin_left = 118
 443     author_margin_right = 62
 444     author_lineskip = 60
 445     author_color = '#fff'
 446     author_shadow = '#000'
 447     author_font_ttf = get_resource('fonts/JunicodeWL-Italic.ttf')
 448     author_font_size = 50
 449
 450     title_top = 0
 451     title_margin_left = 118
 452     title_margin_right = 62
 453     title_lineskip = 60
 454     title_color = '#fff'
 455     title_shadow = '#000'
 456     title_font_ttf = get_resource('fonts/JunicodeWL-Italic.ttf')
 457     title_font_size = 50
 458
 459     def pretty_title(self):
 460         return u"„%s”" % self.title
 461
 462
 463 class BookotekaCover(Cover):
 464     width = 2140
 465     height = 2733
 466     background_img = get_resource('res/cover-bookoteka.png')
 467
 468     author_top = 480
 469     author_margin_left = 307
 470     author_margin_right = 233
 471     author_lineskip = 156
 472     author_color = '#d9d919'
 473     author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 474     author_font_size = 130
 475
 476     title_top = 400
 477     title_margin_left = 307
 478     title_margin_right = 233
 479     title_lineskip = 168
 480     title_color = '#d9d919'
 481     title_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 482     title_font_size = 140
 483
 484     format = 'PNG'
 485
 486
 487 class GandalfCover(Cover):
 488     width = 600
 489     height = 730
 490     background_img = get_resource('res/cover-gandalf.png')
 491     author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 492     author_font_size = 30
 493     title_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 494     title_font_size = 40
 495     logo_bottom = 25
 496     logo_width = 250
 497     format = 'PNG'
 498
 499
 500 DefaultEbookCover = LogoWLCover
 501