src/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 from __future__ import unicode_literals
   7
   8 import re
   9 from PIL import Image, ImageFont, ImageDraw, ImageFilter
  10 from six import BytesIO
  11 from librarian import get_resource, OutputFile, URLOpener
  12
  13
  14 class Metric(object):
  15     """Gets metrics from an object, scaling it by a factor."""
  16     def __init__(self, obj, scale):
  17         self._obj = obj
  18         self._scale = float(scale)
  19
  20     def __getattr__(self, name):
  21         src = getattr(self._obj, name)
  22         if src and self._scale:
  23             return type(src)(self._scale * src)
  24         else:
  25             return src
  26
  27
  28 class TextBox(object):
  29     """Creates an Image with a series of centered strings."""
  30
  31     SHADOW_X = 3
  32     SHADOW_Y = 3
  33     SHADOW_BLUR = 3
  34
  35     def __init__(self, max_width, max_height, padding_x=None, padding_y=None):
  36         if padding_x is None:
  37             padding_x = self.SHADOW_X + self.SHADOW_BLUR
  38         if padding_y is None:
  39             padding_y = self.SHADOW_Y + self.SHADOW_BLUR
  40
  41         self.max_width = max_width
  42         self.max_text_width = max_width - 2 * padding_x
  43         self.padding_y = padding_y
  44         self.height = padding_y
  45         self.img = Image.new('RGBA', (max_width, max_height))
  46         self.draw = ImageDraw.Draw(self.img)
  47         self.shadow_img = None
  48         self.shadow_draw = None
  49
  50     def skip(self, height):
  51         """Skips some vertical space."""
  52         self.height += height
  53
  54     def text(self, text, color='#000', font=None, line_height=20,
  55              shadow_color=None):
  56         """Writes some centered text."""
  57         text = re.sub(r'\s+', ' ', text)
  58         if shadow_color:
  59             if not self.shadow_img:
  60                 self.shadow_img = Image.new('RGBA', self.img.size)
  61                 self.shadow_draw = ImageDraw.Draw(self.shadow_img)
  62         while text:
  63             line = text
  64             line_width = self.draw.textsize(line, font=font)[0]
  65             while line_width > self.max_text_width:
  66                 parts = line.rsplit(' ', 1)
  67                 if len(parts) == 1:
  68                     line_width = self.max_text_width
  69                     break
  70                 line = parts[0]
  71                 line_width = self.draw.textsize(line, font=font)[0]
  72             line = line.strip() + ' '
  73
  74             pos_x = (self.max_width - line_width) // 2
  75
  76             if shadow_color:
  77                 self.shadow_draw.text(
  78                         (pos_x + self.SHADOW_X, self.height + self.SHADOW_Y),
  79                         line, font=font, fill=shadow_color
  80                 )
  81
  82             self.draw.text((pos_x, self.height), line, font=font, fill=color)
  83             self.height += line_height
  84             # go to next line
  85             text = text[len(line):]
  86
  87     def image(self):
  88         """Creates the actual Image object."""
  89         image = Image.new('RGBA', (self.max_width,
  90                                    self.height + self.padding_y))
  91         if self.shadow_img:
  92             shadow = self.shadow_img.filter(ImageFilter.BLUR)
  93             image.paste(shadow, (0, 0), shadow)
  94             image.paste(self.img, (0, 0), self.img)
  95         else:
  96             image.paste(self.img, (0, 0))
  97         return image
  98
  99
 100 class Cover(object):
 101     """Abstract base class for cover images generator."""
 102     width = 600
 103     height = 800
 104     background_color = '#fff'
 105     background_img = None
 106
 107     author_top = 100
 108     author_margin_left = 20
 109     author_margin_right = 20
 110     author_lineskip = 40
 111     author_color = '#000'
 112     author_shadow = None
 113     author_font_ttf = get_resource('fonts/DejaVuSerif.ttf')
 114     author_font_size = 30
 115
 116     title_top = 100
 117     title_margin_left = 20
 118     title_margin_right = 20
 119     title_lineskip = 54
 120     title_color = '#000'
 121     title_shadow = None
 122     title_font_ttf = get_resource('fonts/DejaVuSerif.ttf')
 123     title_font_size = 40
 124
 125     logo_bottom = None
 126     logo_width = None
 127     uses_dc_cover = False
 128
 129     format = 'JPEG'
 130     scale = 1
 131     scale_after = 1
 132
 133     exts = {
 134         'JPEG': 'jpg',
 135         'PNG': 'png',
 136         }
 137
 138     mime_types = {
 139         'JPEG': 'image/jpeg',
 140         'PNG': 'image/png',
 141         }
 142
 143     def __init__(self, book_info, format=None, width=None, height=None):
 144         self.authors = [auth.readable() for auth in book_info.authors]
 145         self.title = book_info.title
 146         if format is not None:
 147             self.format = format
 148         if width and height:
 149             self.height = int(round(height * self.width / width))
 150         scale = max(float(width or 0) / self.width,
 151                     float(height or 0) / self.height)
 152         if scale >= 1:
 153             self.scale = scale
 154         elif scale:
 155             self.scale_after = scale
 156
 157     def pretty_authors(self):
 158         """Allows for decorating authors' names."""
 159         return [self.authors]
 160
 161     def pretty_title(self):
 162         """Allows for decorating title."""
 163         return self.title
 164
 165     def image(self):
 166         metr = Metric(self, self.scale)
 167         img = Image.new('RGB', (metr.width, metr.height),
 168                         self.background_color)
 169
 170         if self.background_img:
 171             background = Image.open(self.background_img)
 172             img.paste(background, None, background)
 173             del background
 174
 175         # WL logo
 176         if metr.logo_width:
 177             logo = Image.open(get_resource('res/wl-logo.png'))
 178             logo = logo.resize((
 179                 metr.logo_width,
 180                 int(round(logo.size[1] * metr.logo_width / logo.size[0]))
 181             ))
 182             img.paste(logo, (
 183                 (metr.width - metr.logo_width) // 2,
 184                 img.size[1] - logo.size[1] - metr.logo_bottom
 185             ))
 186
 187         top = metr.author_top
 188         tbox = TextBox(
 189             metr.width - metr.author_margin_left - metr.author_margin_right,
 190             metr.height - top,
 191             )
 192
 193         author_font = ImageFont.truetype(
 194             self.author_font_ttf, metr.author_font_size,
 195             layout_engine=ImageFont.LAYOUT_BASIC)
 196         for pa in self.pretty_authors():
 197             tbox.text(pa, self.author_color, author_font, metr.author_lineskip,
 198                       self.author_shadow)
 199         text_img = tbox.image()
 200         img.paste(text_img, (metr.author_margin_left, top), text_img)
 201
 202         top += text_img.size[1] + metr.title_top
 203         tbox = TextBox(
 204             metr.width - metr.title_margin_left - metr.title_margin_right,
 205             metr.height - top,
 206             )
 207         title_font = ImageFont.truetype(
 208             self.title_font_ttf, metr.title_font_size,
 209             layout_engine=ImageFont.LAYOUT_BASIC)
 210         tbox.text(self.pretty_title(), self.title_color, title_font,
 211                   metr.title_lineskip, self.title_shadow)
 212         text_img = tbox.image()
 213         img.paste(text_img, (metr.title_margin_left, top), text_img)
 214
 215         return img
 216
 217     def final_image(self):
 218         img = self.image()
 219         if self.scale_after != 1:
 220             img = img.resize((
 221                     int(round(img.size[0] * self.scale_after)),
 222                     int(round(img.size[1] * self.scale_after))),
 223                 Image.ANTIALIAS)
 224         return img
 225
 226     def mime_type(self):
 227         return self.mime_types[self.format]
 228
 229     def ext(self):
 230         return self.exts[self.format]
 231
 232     def save(self, *args, **kwargs):
 233         default_kwargs = {
 234                 'format': self.format,
 235                 'quality': 95,
 236         }
 237         default_kwargs.update(kwargs)
 238         return self.final_image().save(*args, **default_kwargs)
 239
 240     def output_file(self, *args, **kwargs):
 241         imgstr = BytesIO()
 242         self.save(imgstr, *args, **kwargs)
 243         return OutputFile.from_bytes(imgstr.getvalue())
 244
 245
 246 class WLCover(Cover):
 247     """Wolne Lektury cover without logos."""
 248     width = 600
 249     height = 833
 250     uses_dc_cover = True
 251     author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 252     author_font_size = 20
 253     author_lineskip = 30
 254     title_font_ttf = get_resource('fonts/DejaVuSerif-Bold.ttf')
 255     title_font_size = 30
 256     title_lineskip = 40
 257     title_box_width = 350
 258
 259     box_top_margin = 100
 260     box_bottom_margin = 100
 261     box_padding_y = 20
 262     box_above_line = 10
 263     box_below_line = 15
 264     box_line_left = 75
 265     box_line_right = 275
 266     box_line_width = 2
 267
 268     logo_top = 15
 269     logo_width = 140
 270
 271     bar_width = 35
 272     bar_color = '#000'
 273     box_position = 'middle'
 274     background_color = '#444'
 275     author_color = '#444'
 276     background_img = get_resource('res/cover.png')
 277     format = 'JPEG'
 278
 279     epoch_colors = {
 280         u'Starożytność': '#9e3610',
 281         u'Średniowiecze': '#564c09',
 282         u'Renesans': '#8ca629',
 283         u'Barok': '#a6820a',
 284         u'Oświecenie': '#f2802e',
 285         u'Romantyzm': '#db4b16',
 286         u'Pozytywizm': '#961060',
 287         u'Modernizm': '#7784e0',
 288         u'Dwudziestolecie międzywojenne': '#3044cf',
 289         u'Współczesność': '#06393d',
 290     }
 291
 292     kind_box_position = {
 293         u'Liryka': 'top',
 294         u'Epika': 'bottom',
 295     }
 296
 297     def __init__(self, book_info, format=None, width=None, height=None,
 298                  bleed=0):
 299         super(WLCover, self).__init__(book_info, format=format, width=width,
 300                                       height=height)
 301         # Set box position.
 302         self.box_position = book_info.cover_box_position or \
 303             self.kind_box_position.get(book_info.kind, self.box_position)
 304         # Set bar color.
 305         if book_info.cover_bar_color == 'none':
 306             self.bar_width = 0
 307         else:
 308             self.bar_color = book_info.cover_bar_color or \
 309                 self.epoch_colors.get(book_info.epoch, self.bar_color)
 310         # Set title color.
 311         self.title_color = self.epoch_colors.get(book_info.epoch,
 312                                                  self.title_color)
 313
 314         self.bleed = bleed
 315         self.box_top_margin += bleed
 316         self.box_bottom_margin += bleed
 317         self.bar_width += bleed
 318
 319         if book_info.cover_url:
 320             url = book_info.cover_url
 321             bg_src = None
 322             if bg_src is None:
 323                 bg_src = URLOpener().open(url)
 324             self.background_img = BytesIO(bg_src.read())
 325             bg_src.close()
 326
 327     def pretty_authors(self):
 328         return [a.upper() for a in self.authors]
 329
 330     def add_box(self, img):
 331         if self.box_position == 'none':
 332             return img
 333
 334         metr = Metric(self, self.scale)
 335
 336         # Write author name.
 337         box = TextBox(metr.title_box_width, metr.height,
 338                       padding_y=metr.box_padding_y)
 339         author_font = ImageFont.truetype(
 340             self.author_font_ttf, metr.author_font_size,
 341             layout_engine=ImageFont.LAYOUT_BASIC)
 342         for pa in self.pretty_authors():
 343             box.text(pa, font=author_font, line_height=metr.author_lineskip,
 344                      color=self.author_color, shadow_color=self.author_shadow)
 345
 346         box.skip(metr.box_above_line)
 347         box.draw.line(
 348             (metr.box_line_left, box.height, metr.box_line_right, box.height),
 349             fill=self.author_color, width=metr.box_line_width
 350         )
 351         box.skip(metr.box_below_line)
 352
 353         # Write title.
 354         title_font = ImageFont.truetype(
 355             self.title_font_ttf, metr.title_font_size,
 356             layout_engine=ImageFont.LAYOUT_BASIC)
 357         box.text(self.pretty_title(),
 358                  line_height=metr.title_lineskip,
 359                  font=title_font,
 360                  color=self.title_color,
 361                  shadow_color=self.title_shadow)
 362
 363         box_img = box.image()
 364
 365         # Find box position.
 366         if self.box_position == 'top':
 367             box_top = metr.box_top_margin
 368         elif self.box_position == 'bottom':
 369             box_top = metr.height - metr.box_bottom_margin - box_img.size[1]
 370         else:   # Middle.
 371             box_top = (metr.height - box_img.size[1]) // 2
 372
 373         box_left = metr.bar_width + (
 374             metr.width - metr.bar_width - box_img.size[0]
 375         ) // 2
 376
 377         # Draw the white box.
 378         ImageDraw.Draw(img).rectangle(
 379             (
 380                 box_left,
 381                 box_top,
 382                 box_left + box_img.size[0],
 383                 box_top + box_img.size[1]
 384             ),
 385             fill='#fff'
 386         )
 387         # Paste the contents into the white box.
 388         img.paste(box_img, (box_left, box_top), box_img)
 389         return img
 390
 391     def add_cut_lines(self, img):
 392         line_ratio = 0.5
 393         if self.bleed == 0:
 394             return img
 395         metr = Metric(self, self.scale)
 396         draw = ImageDraw.Draw(img)
 397         for corner_x, corner_y in (
 398                 (0, 0), (metr.width, 0),
 399                 (0, metr.height), (metr.width, metr.height)
 400                 ):
 401             dir_x = 1 if corner_x == 0 else -1
 402             dir_y = 1 if corner_y == 0 else -1
 403             for offset in (-1, 0, 1):
 404                 draw.line(
 405                     (
 406                         corner_x,
 407                         corner_y + dir_y * metr.bleed + offset,
 408                         corner_x + dir_x * metr.bleed * line_ratio,
 409                         corner_y + dir_y * metr.bleed + offset
 410                     ),
 411                     fill='black' if offset == 0 else 'white',
 412                     width=1
 413                 )
 414                 draw.line(
 415                     (
 416                         corner_x + dir_x * metr.bleed + offset,
 417                         corner_y,
 418                         corner_x + dir_x * metr.bleed + offset,
 419                         corner_y + dir_y * metr.bleed * line_ratio
 420                     ),
 421                     fill='black' if offset == 0 else 'white',
 422                     width=1
 423                 )
 424         return img
 425
 426     def image(self):
 427         metr = Metric(self, self.scale)
 428         img = Image.new('RGB', (metr.width, metr.height),
 429                         self.background_color)
 430         draw = ImageDraw.Draw(img)
 431
 432         draw.rectangle((0, 0, metr.bar_width, metr.height),
 433                        fill=self.bar_color)
 434
 435         if self.background_img:
 436             src = Image.open(self.background_img)
 437             trg_size = (metr.width - metr.bar_width, metr.height)
 438             if src.size[0] * trg_size[1] < src.size[1] * trg_size[0]:
 439                 resized = (
 440                     trg_size[0],
 441                     int(round(src.size[1] * trg_size[0] / src.size[0]))
 442                 )
 443                 cut = (resized[1] - trg_size[1]) // 2
 444                 src = src.resize(resized, Image.ANTIALIAS)
 445                 src = src.crop((0, cut, src.size[0], src.size[1] - cut))
 446             else:
 447                 resized = (
 448                     int(round(src.size[0] * trg_size[1] / src.size[1])),
 449                     trg_size[1],
 450                 )
 451                 cut = (resized[0] - trg_size[0]) // 2
 452                 src = src.resize(resized, Image.ANTIALIAS)
 453                 src = src.crop((cut, 0, src.size[0] - cut, src.size[1]))
 454
 455             img.paste(src, (metr.bar_width, 0))
 456             del src
 457
 458         img = self.add_box(img)
 459
 460         # img = self.add_cut_lines(img)
 461
 462         return img
 463
 464
 465 class WLNoBoxCover(WLCover):
 466     def add_box(self, img):
 467         return img
 468
 469
 470 class LogoWLCover(WLCover):
 471     gradient_height = 90
 472     gradient_logo_height = 60
 473     gradient_logo_margin_right = 30
 474     gradient_logo_spacing = 40
 475     gradient_color = '#000'
 476     gradient_opacity = .6
 477     gradient_logos = [
 478         'res/wl-logo-white.png',
 479         'res/fnp-logo-white.png',
 480     ]
 481
 482     def __init__(self, book_info, *args, **kwargs):
 483         super(LogoWLCover, self).__init__(book_info, *args, **kwargs)
 484         self.gradient_height += self.bleed
 485         self.gradient_logo_margin_right += self.bleed
 486
 487         self.additional_cover_logos = [
 488             BytesIO(URLOpener().open(cover_logo_url).read())
 489             for cover_logo_url in book_info.cover_logo_urls
 490         ]
 491
 492     def image(self):
 493         img = super(LogoWLCover, self).image()
 494         metr = Metric(self, self.scale)
 495         gradient = Image.new(
 496             'RGBA',
 497             (metr.width - metr.bar_width, metr.gradient_height),
 498             self.gradient_color
 499         )
 500         gradient_mask = Image.new(
 501             'L',
 502             (metr.width - metr.bar_width, metr.gradient_height)
 503         )
 504         draw = ImageDraw.Draw(gradient_mask)
 505         for line in range(0, metr.gradient_height):
 506             draw.line(
 507                 (0, line, metr.width - metr.bar_width, line),
 508                 fill=int(
 509                     255 * self.gradient_opacity * line / metr.gradient_height
 510                 )
 511             )
 512         img.paste(gradient,
 513                   (metr.bar_width, metr.height - metr.gradient_height),
 514                   mask=gradient_mask)
 515
 516         cursor = metr.width - metr.gradient_logo_margin_right
 517         logo_top = int(
 518             metr.height
 519             - metr.gradient_height / 2
 520             - metr.gradient_logo_height / 2 - metr.bleed / 2
 521         )
 522
 523         logos = [
 524             get_resource(logo_path)
 525             for logo_path in self.gradient_logos[::-1]
 526         ]
 527         logos = logos + self.additional_cover_logos
 528         logos = [
 529             Image.open(logo_bytes).convert('RGBA')
 530             for logo_bytes in logos
 531         ]
 532
 533         # See if logos fit into the gradient. If not, scale down accordingly.
 534         space_for_logos = (
 535             metr.width
 536             - metr.bar_width
 537             - 2 * metr.gradient_logo_margin_right
 538         )
 539         widths = [
 540             logo.size[0] * metr.gradient_logo_height / logo.size[1]
 541             for logo in logos]
 542         taken_space = (
 543             sum(widths)
 544             + (len(logos) - 1) * (metr.gradient_logo_spacing)
 545         )
 546         logo_scale = (
 547             space_for_logos / taken_space
 548             if taken_space > space_for_logos else 1
 549         )
 550         logo_top += int(metr.gradient_logo_height * (1 - logo_scale) / 2)
 551
 552         for i, logo in enumerate(logos):
 553             logo = logo.resize(
 554                 (
 555                     int(round(widths[i] * logo_scale)),
 556                     int(round(metr.gradient_logo_height * logo_scale))
 557                 ),
 558                 Image.ANTIALIAS)
 559             cursor -= logo.size[0]
 560             img.paste(logo, (cursor, logo_top), mask=logo)
 561             cursor -= int(round(metr.gradient_logo_spacing * logo_scale))
 562
 563         return img
 564
 565
 566 class EbookpointCover(LogoWLCover):
 567     gradient_logo_height = 58
 568     gradient_logo_spacing = 25
 569     gradient_logos = [
 570         'res/ebookpoint-logo-white.png',
 571         'res/wl-logo-white.png',
 572         'res/fnp-logo-white.png',
 573     ]
 574
 575
 576 class VirtualoCover(Cover):
 577     width = 600
 578     height = 730
 579     author_top = 73
 580     title_top = 73
 581     logo_bottom = 25
 582     logo_width = 250
 583
 584
 585 class PrestigioCover(Cover):
 586     width = 580
 587     height = 783
 588     background_img = get_resource('res/cover-prestigio.png')
 589
 590     author_top = 446
 591     author_margin_left = 118
 592     author_margin_right = 62
 593     author_lineskip = 60
 594     author_color = '#fff'
 595     author_shadow = '#000'
 596     author_font_ttf = get_resource('fonts/JunicodeWL-Italic.ttf')
 597     author_font_size = 50
 598
 599     title_top = 0
 600     title_margin_left = 118
 601     title_margin_right = 62
 602     title_lineskip = 60
 603     title_color = '#fff'
 604     title_shadow = '#000'
 605     title_font_ttf = get_resource('fonts/JunicodeWL-Italic.ttf')
 606     title_font_size = 50
 607
 608     def pretty_title(self):
 609         return u"„%s”" % self.title
 610
 611
 612 class BookotekaCover(Cover):
 613     width = 2140
 614     height = 2733
 615     background_img = get_resource('res/cover-bookoteka.png')
 616
 617     author_top = 480
 618     author_margin_left = 307
 619     author_margin_right = 233
 620     author_lineskip = 156
 621     author_color = '#d9d919'
 622     author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 623     author_font_size = 130
 624
 625     title_top = 400
 626     title_margin_left = 307
 627     title_margin_right = 233
 628     title_lineskip = 168
 629     title_color = '#d9d919'
 630     title_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 631     title_font_size = 140
 632
 633     format = 'PNG'
 634
 635
 636 class GandalfCover(Cover):
 637     width = 600
 638     height = 730
 639     background_img = get_resource('res/cover-gandalf.png')
 640     author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 641     author_font_size = 30
 642     title_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 643     title_font_size = 40
 644     logo_bottom = 25
 645     logo_width = 250
 646     format = 'PNG'
 647
 648
 649 class KMLUCover(LogoWLCover):
 650     gradient_logo_height = 58
 651     gradient_logo_spacing = 25
 652     gradient_logos = [
 653         'res/kmlu-logo-white.png',
 654         'res/wl-logo-white.png',
 655         'res/fnp-logo-white.png',
 656     ]
 657
 658
 659 class MPWCover(LogoWLCover):
 660     gradient_logo_height = 58
 661     gradient_logo_spacing = 25
 662     gradient_logos = [
 663         'res/mpw-logo-white.png',
 664         'res/wl-logo-white.png',
 665         'res/fnp-logo-white.png',
 666     ]
 667
 668
 669 class AtriumCover(LogoWLCover):
 670     gradient_logo_height = 58
 671     gradient_logo_spacing = 25
 672     gradient_logos = [
 673         'res/atrium-logo.png',
 674         'res/wl-logo-white.png',
 675         'res/fnp-logo-white.png',
 676     ]
 677
 678
 679 COVER_CLASSES = {
 680     'default': LogoWLCover,
 681     'kmlu': KMLUCover,
 682     'mpw': MPWCover,
 683     'atrium': AtriumCover,
 684 }
 685
 686
 687 def make_cover(book_info, *args, **kwargs):
 688     if 'cover_class' in kwargs:
 689         cover_class_name = kwargs.pop('cover_class')
 690     else:
 691         cover_class_name = book_info.cover_class
 692     cover_class = COVER_CLASSES[cover_class_name]
 693     return cover_class(book_info, *args, **kwargs)