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         for pa in self.pretty_authors():
 196             tbox.text(pa, self.author_color, author_font, metr.author_lineskip,
 197                       self.author_shadow)
 198         text_img = tbox.image()
 199         img.paste(text_img, (metr.author_margin_left, top), text_img)
 200
 201         top += text_img.size[1] + metr.title_top
 202         tbox = TextBox(
 203             metr.width - metr.title_margin_left - metr.title_margin_right,
 204             metr.height - top,
 205             )
 206         title_font = ImageFont.truetype(
 207             self.title_font_ttf, metr.title_font_size)
 208         tbox.text(self.pretty_title(), self.title_color, title_font,
 209                   metr.title_lineskip, self.title_shadow)
 210         text_img = tbox.image()
 211         img.paste(text_img, (metr.title_margin_left, top), text_img)
 212
 213         return img
 214
 215     def final_image(self):
 216         img = self.image()
 217         if self.scale_after != 1:
 218             img = img.resize((
 219                     int(round(img.size[0] * self.scale_after)),
 220                     int(round(img.size[1] * self.scale_after))),
 221                 Image.ANTIALIAS)
 222         return img
 223
 224     def mime_type(self):
 225         return self.mime_types[self.format]
 226
 227     def ext(self):
 228         return self.exts[self.format]
 229
 230     def save(self, *args, **kwargs):
 231         default_kwargs = {
 232                 'format': self.format,
 233                 'quality': 95,
 234         }
 235         default_kwargs.update(kwargs)
 236         return self.final_image().save(*args, **default_kwargs)
 237
 238     def output_file(self, *args, **kwargs):
 239         imgstr = BytesIO()
 240         self.save(imgstr, *args, **kwargs)
 241         return OutputFile.from_bytes(imgstr.getvalue())
 242
 243
 244 class WLCover(Cover):
 245     """Wolne Lektury cover without logos."""
 246     width = 600
 247     height = 833
 248     uses_dc_cover = True
 249     author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 250     author_font_size = 20
 251     author_lineskip = 30
 252     title_font_ttf = get_resource('fonts/DejaVuSerif-Bold.ttf')
 253     title_font_size = 30
 254     title_lineskip = 40
 255     title_box_width = 350
 256
 257     box_top_margin = 100
 258     box_bottom_margin = 100
 259     box_padding_y = 20
 260     box_above_line = 10
 261     box_below_line = 15
 262     box_line_left = 75
 263     box_line_right = 275
 264     box_line_width = 2
 265
 266     logo_top = 15
 267     logo_width = 140
 268
 269     bar_width = 35
 270     bar_color = '#000'
 271     box_position = 'middle'
 272     background_color = '#444'
 273     author_color = '#444'
 274     background_img = get_resource('res/cover.png')
 275     format = 'JPEG'
 276
 277     epoch_colors = {
 278         u'Starożytność': '#9e3610',
 279         u'Średniowiecze': '#564c09',
 280         u'Renesans': '#8ca629',
 281         u'Barok': '#a6820a',
 282         u'Oświecenie': '#f2802e',
 283         u'Romantyzm': '#db4b16',
 284         u'Pozytywizm': '#961060',
 285         u'Modernizm': '#7784e0',
 286         u'Dwudziestolecie międzywojenne': '#3044cf',
 287         u'Współczesność': '#06393d',
 288     }
 289
 290     kind_box_position = {
 291         u'Liryka': 'top',
 292         u'Epika': 'bottom',
 293     }
 294
 295     def __init__(self, book_info, format=None, width=None, height=None,
 296                  bleed=0):
 297         super(WLCover, self).__init__(book_info, format=format, width=width,
 298                                       height=height)
 299         # Set box position.
 300         self.box_position = book_info.cover_box_position or \
 301             self.kind_box_position.get(book_info.kind, self.box_position)
 302         # Set bar color.
 303         if book_info.cover_bar_color == 'none':
 304             self.bar_width = 0
 305         else:
 306             self.bar_color = book_info.cover_bar_color or \
 307                 self.epoch_colors.get(book_info.epoch, self.bar_color)
 308         # Set title color.
 309         self.title_color = self.epoch_colors.get(book_info.epoch,
 310                                                  self.title_color)
 311
 312         self.bleed = bleed
 313         self.box_top_margin += bleed
 314         self.box_bottom_margin += bleed
 315         self.bar_width += bleed
 316
 317         if book_info.cover_url:
 318             url = book_info.cover_url
 319             bg_src = None
 320             if bg_src is None:
 321                 bg_src = URLOpener().open(url)
 322             self.background_img = BytesIO(bg_src.read())
 323             bg_src.close()
 324
 325     def pretty_authors(self):
 326         return [a.upper() for a in self.authors]
 327
 328     def add_box(self, img):
 329         if self.box_position == 'none':
 330             return img
 331
 332         metr = Metric(self, self.scale)
 333
 334         # Write author name.
 335         box = TextBox(metr.title_box_width, metr.height,
 336                       padding_y=metr.box_padding_y)
 337         author_font = ImageFont.truetype(
 338             self.author_font_ttf, metr.author_font_size)
 339         for pa in self.pretty_authors():
 340             box.text(pa, font=author_font, line_height=metr.author_lineskip,
 341                      color=self.author_color, shadow_color=self.author_shadow)
 342
 343         box.skip(metr.box_above_line)
 344         box.draw.line(
 345             (metr.box_line_left, box.height, metr.box_line_right, box.height),
 346             fill=self.author_color, width=metr.box_line_width
 347         )
 348         box.skip(metr.box_below_line)
 349
 350         # Write title.
 351         title_font = ImageFont.truetype(
 352             self.title_font_ttf, metr.title_font_size)
 353         box.text(self.pretty_title(),
 354                  line_height=metr.title_lineskip,
 355                  font=title_font,
 356                  color=self.title_color,
 357                  shadow_color=self.title_shadow)
 358
 359         box_img = box.image()
 360
 361         # Find box position.
 362         if self.box_position == 'top':
 363             box_top = metr.box_top_margin
 364         elif self.box_position == 'bottom':
 365             box_top = metr.height - metr.box_bottom_margin - box_img.size[1]
 366         else:   # Middle.
 367             box_top = (metr.height - box_img.size[1]) // 2
 368
 369         box_left = metr.bar_width + (
 370             metr.width - metr.bar_width - box_img.size[0]
 371         ) // 2
 372
 373         # Draw the white box.
 374         ImageDraw.Draw(img).rectangle(
 375             (
 376                 box_left,
 377                 box_top,
 378                 box_left + box_img.size[0],
 379                 box_top + box_img.size[1]
 380             ),
 381             fill='#fff'
 382         )
 383         # Paste the contents into the white box.
 384         img.paste(box_img, (box_left, box_top), box_img)
 385         return img
 386
 387     def add_cut_lines(self, img):
 388         line_ratio = 0.5
 389         if self.bleed == 0:
 390             return img
 391         metr = Metric(self, self.scale)
 392         draw = ImageDraw.Draw(img)
 393         for corner_x, corner_y in (
 394                 (0, 0), (metr.width, 0),
 395                 (0, metr.height), (metr.width, metr.height)
 396                 ):
 397             dir_x = 1 if corner_x == 0 else -1
 398             dir_y = 1 if corner_y == 0 else -1
 399             for offset in (-1, 0, 1):
 400                 draw.line(
 401                     (
 402                         corner_x,
 403                         corner_y + dir_y * metr.bleed + offset,
 404                         corner_x + dir_x * metr.bleed * line_ratio,
 405                         corner_y + dir_y * metr.bleed + offset
 406                     ),
 407                     fill='black' if offset == 0 else 'white',
 408                     width=1
 409                 )
 410                 draw.line(
 411                     (
 412                         corner_x + dir_x * metr.bleed + offset,
 413                         corner_y,
 414                         corner_x + dir_x * metr.bleed + offset,
 415                         corner_y + dir_y * metr.bleed * line_ratio
 416                     ),
 417                     fill='black' if offset == 0 else 'white',
 418                     width=1
 419                 )
 420         return img
 421
 422     def image(self):
 423         metr = Metric(self, self.scale)
 424         img = Image.new('RGB', (metr.width, metr.height),
 425                         self.background_color)
 426         draw = ImageDraw.Draw(img)
 427
 428         draw.rectangle((0, 0, metr.bar_width, metr.height),
 429                        fill=self.bar_color)
 430
 431         if self.background_img:
 432             src = Image.open(self.background_img)
 433             trg_size = (metr.width - metr.bar_width, metr.height)
 434             if src.size[0] * trg_size[1] < src.size[1] * trg_size[0]:
 435                 resized = (
 436                     trg_size[0],
 437                     int(round(src.size[1] * trg_size[0] / src.size[0]))
 438                 )
 439                 cut = (resized[1] - trg_size[1]) // 2
 440                 src = src.resize(resized, Image.ANTIALIAS)
 441                 src = src.crop((0, cut, src.size[0], src.size[1] - cut))
 442             else:
 443                 resized = (
 444                     int(round(src.size[0] * trg_size[1] / src.size[1])),
 445                     trg_size[1],
 446                 )
 447                 cut = (resized[0] - trg_size[0]) // 2
 448                 src = src.resize(resized, Image.ANTIALIAS)
 449                 src = src.crop((cut, 0, src.size[0] - cut, src.size[1]))
 450
 451             img.paste(src, (metr.bar_width, 0))
 452             del src
 453
 454         img = self.add_box(img)
 455
 456         # img = self.add_cut_lines(img)
 457
 458         return img
 459
 460
 461 class WLNoBoxCover(WLCover):
 462     def add_box(self, img):
 463         return img
 464
 465
 466 class LogoWLCover(WLCover):
 467     gradient_height = 90
 468     gradient_logo_height = 60
 469     gradient_logo_margin_right = 30
 470     gradient_logo_spacing = 40
 471     gradient_color = '#000'
 472     gradient_opacity = .6
 473     gradient_logos = [
 474         'res/wl-logo-white.png',
 475         'res/fnp-logo-white.png',
 476     ]
 477
 478     def __init__(self, book_info, *args, **kwargs):
 479         super(LogoWLCover, self).__init__(book_info, *args, **kwargs)
 480         self.gradient_height += self.bleed
 481         self.gradient_logo_margin_right += self.bleed
 482
 483         self.additional_cover_logos = [
 484             BytesIO(URLOpener().open(cover_logo_url).read())
 485             for cover_logo_url in book_info.cover_logo_urls
 486         ]
 487
 488     def image(self):
 489         img = super(LogoWLCover, self).image()
 490         metr = Metric(self, self.scale)
 491         gradient = Image.new(
 492             'RGBA',
 493             (metr.width - metr.bar_width, metr.gradient_height),
 494             self.gradient_color
 495         )
 496         gradient_mask = Image.new(
 497             'L',
 498             (metr.width - metr.bar_width, metr.gradient_height)
 499         )
 500         draw = ImageDraw.Draw(gradient_mask)
 501         for line in range(0, metr.gradient_height):
 502             draw.line(
 503                 (0, line, metr.width - metr.bar_width, line),
 504                 fill=int(
 505                     255 * self.gradient_opacity * line / metr.gradient_height
 506                 )
 507             )
 508         img.paste(gradient,
 509                   (metr.bar_width, metr.height - metr.gradient_height),
 510                   mask=gradient_mask)
 511
 512         cursor = metr.width - metr.gradient_logo_margin_right
 513         logo_top = int(
 514             metr.height
 515             - metr.gradient_height / 2
 516             - metr.gradient_logo_height / 2 - metr.bleed / 2
 517         )
 518
 519         logos = [
 520             get_resource(logo_path)
 521             for logo_path in self.gradient_logos[::-1]
 522         ]
 523         logos = logos + self.additional_cover_logos
 524         logos = [
 525             Image.open(logo_bytes).convert('RGBA')
 526             for logo_bytes in logos
 527         ]
 528
 529         # See if logos fit into the gradient. If not, scale down accordingly.
 530         space_for_logos = (
 531             metr.width
 532             - metr.bar_width
 533             - 2 * metr.gradient_logo_margin_right
 534         )
 535         widths = [
 536             logo.size[0] * metr.gradient_logo_height / logo.size[1]
 537             for logo in logos]
 538         taken_space = (
 539             sum(widths)
 540             + (len(logos) - 1) * (metr.gradient_logo_spacing)
 541         )
 542         logo_scale = (
 543             space_for_logos / taken_space
 544             if taken_space > space_for_logos else 1
 545         )
 546         logo_top += int(metr.gradient_logo_height * (1 - logo_scale) / 2)
 547
 548         for i, logo in enumerate(logos):
 549             logo = logo.resize(
 550                 (
 551                     int(round(widths[i] * logo_scale)),
 552                     int(round(metr.gradient_logo_height * logo_scale))
 553                 ),
 554                 Image.ANTIALIAS)
 555             cursor -= logo.size[0]
 556             img.paste(logo, (cursor, logo_top), mask=logo)
 557             cursor -= int(round(metr.gradient_logo_spacing * logo_scale))
 558
 559         return img
 560
 561
 562 class EbookpointCover(LogoWLCover):
 563     gradient_logo_height = 58
 564     gradient_logo_spacing = 25
 565     gradient_logos = [
 566         'res/ebookpoint-logo-white.png',
 567         'res/wl-logo-white.png',
 568         'res/fnp-logo-white.png',
 569     ]
 570
 571
 572 class VirtualoCover(Cover):
 573     width = 600
 574     height = 730
 575     author_top = 73
 576     title_top = 73
 577     logo_bottom = 25
 578     logo_width = 250
 579
 580
 581 class PrestigioCover(Cover):
 582     width = 580
 583     height = 783
 584     background_img = get_resource('res/cover-prestigio.png')
 585
 586     author_top = 446
 587     author_margin_left = 118
 588     author_margin_right = 62
 589     author_lineskip = 60
 590     author_color = '#fff'
 591     author_shadow = '#000'
 592     author_font_ttf = get_resource('fonts/JunicodeWL-Italic.ttf')
 593     author_font_size = 50
 594
 595     title_top = 0
 596     title_margin_left = 118
 597     title_margin_right = 62
 598     title_lineskip = 60
 599     title_color = '#fff'
 600     title_shadow = '#000'
 601     title_font_ttf = get_resource('fonts/JunicodeWL-Italic.ttf')
 602     title_font_size = 50
 603
 604     def pretty_title(self):
 605         return u"„%s”" % self.title
 606
 607
 608 class BookotekaCover(Cover):
 609     width = 2140
 610     height = 2733
 611     background_img = get_resource('res/cover-bookoteka.png')
 612
 613     author_top = 480
 614     author_margin_left = 307
 615     author_margin_right = 233
 616     author_lineskip = 156
 617     author_color = '#d9d919'
 618     author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 619     author_font_size = 130
 620
 621     title_top = 400
 622     title_margin_left = 307
 623     title_margin_right = 233
 624     title_lineskip = 168
 625     title_color = '#d9d919'
 626     title_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 627     title_font_size = 140
 628
 629     format = 'PNG'
 630
 631
 632 class GandalfCover(Cover):
 633     width = 600
 634     height = 730
 635     background_img = get_resource('res/cover-gandalf.png')
 636     author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 637     author_font_size = 30
 638     title_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 639     title_font_size = 40
 640     logo_bottom = 25
 641     logo_width = 250
 642     format = 'PNG'
 643
 644
 645 class KMLUCover(LogoWLCover):
 646     gradient_logo_height = 58
 647     gradient_logo_spacing = 25
 648     gradient_logos = [
 649         'res/kmlu-logo-white.png',
 650         'res/wl-logo-white.png',
 651         'res/fnp-logo-white.png',
 652     ]
 653
 654
 655 class MPWCover(LogoWLCover):
 656     gradient_logo_height = 58
 657     gradient_logo_spacing = 25
 658     gradient_logos = [
 659         'res/mpw-logo-white.png',
 660         'res/wl-logo-white.png',
 661         'res/fnp-logo-white.png',
 662     ]
 663
 664
 665 class AtriumCover(LogoWLCover):
 666     gradient_logo_height = 58
 667     gradient_logo_spacing = 25
 668     gradient_logos = [
 669         'res/atrium-logo.png',
 670         'res/wl-logo-white.png',
 671         'res/fnp-logo-white.png',
 672     ]
 673
 674
 675 COVER_CLASSES = {
 676     'default': LogoWLCover,
 677     'kmlu': KMLUCover,
 678     'mpw': MPWCover,
 679     'atrium': AtriumCover,
 680 }
 681
 682
 683 def make_cover(book_info, *args, **kwargs):
 684     if 'cover_class' in kwargs:
 685         cover_class_name = kwargs.pop('cover_class')
 686     else:
 687         cover_class_name = book_info.cover_class
 688     cover_class = COVER_CLASSES[cover_class_name]
 689     return cover_class(book_info, *args, **kwargs)