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
 129     exts = {
 130         'JPEG': 'jpg',
 131         'PNG': 'png',
 132         }
 133
 134     mime_types = {
 135         'JPEG': 'image/jpeg',
 136         'PNG': 'image/png',
 137         }
 138
 139     def __init__(self, book_info, format=None, width=None, height=None):
 140         self.author = ", ".join(auth.readable() for auth in book_info.authors)
 141         self.title = book_info.title
 142         if format is not None:
 143             self.format = format
 144         scale = max(float(width or 0) / self.width, float(height or 0) / self.height)
 145         if scale:
 146             self.scale = scale
 147
 148     def pretty_author(self):
 149         """Allows for decorating author's name."""
 150         return self.author
 151
 152     def pretty_title(self):
 153         """Allows for decorating title."""
 154         return self.title
 155
 156     def image(self):
 157         metr = Metric(self, self.scale)
 158         img = Image.new('RGB', (metr.width, metr.height), self.background_color)
 159
 160         if self.background_img:
 161             background = Image.open(self.background_img)
 162             img.paste(background, None, background)
 163             del background
 164
 165         # WL logo
 166         if metr.logo_width:
 167             logo = Image.open(get_resource('res/wl-logo.png'))
 168             logo = logo.resize((metr.logo_width, logo.size[1] * metr.logo_width / logo.size[0]))
 169             img.paste(logo, ((metr.width - metr.logo_width) / 2, img.size[1] - logo.size[1] - metr.logo_bottom))
 170
 171         top = metr.author_top
 172         tbox = TextBox(
 173             metr.width - metr.author_margin_left - metr.author_margin_right,
 174             metr.height - top,
 175             )
 176
 177         author_font = ImageFont.truetype(
 178             self.author_font_ttf, metr.author_font_size)
 179         tbox.text(self.pretty_author(), self.author_color, author_font,
 180             metr.author_lineskip, self.author_shadow)
 181         text_img = tbox.image()
 182         img.paste(text_img, (metr.author_margin_left, top), text_img)
 183
 184         top += text_img.size[1] + metr.title_top
 185         tbox = TextBox(
 186             metr.width - metr.title_margin_left - metr.title_margin_right,
 187             metr.height - top,
 188             )
 189         title_font = ImageFont.truetype(
 190             self.title_font_ttf, metr.title_font_size)
 191         tbox.text(self.pretty_title(), self.title_color, title_font,
 192             metr.title_lineskip, self.title_shadow)
 193         text_img = tbox.image()
 194         img.paste(text_img, (metr.title_margin_left, top), text_img)
 195
 196         return img
 197
 198     def mime_type(self):
 199         return self.mime_types[self.format]
 200
 201     def ext(self):
 202         return self.exts[self.format]
 203
 204     def save(self, *args, **kwargs):
 205         return self.image().save(format=self.format, quality=95, *args, **kwargs)
 206
 207     def output_file(self, *args, **kwargs):
 208         imgstr = StringIO()
 209         self.save(imgstr, *args, **kwargs)
 210         return OutputFile.from_string(imgstr.getvalue())
 211
 212
 213 class WLCover(Cover):
 214     """Default Wolne Lektury cover generator."""
 215     width = 600
 216     height = 833
 217     uses_dc_cover = True
 218     author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 219     author_font_size = 20
 220     author_lineskip = 30
 221     title_font_ttf = get_resource('fonts/DejaVuSerif-Bold.ttf')
 222     title_font_size = 30
 223     title_lineskip = 40
 224     title_box_width = 350
 225
 226     box_top_margin = 100
 227     box_bottom_margin = 100
 228     box_padding_y = 20
 229     box_above_line = 10
 230     box_below_line = 15
 231     box_line_left = 75
 232     box_line_right = 275
 233     box_line_width = 2
 234
 235     logo_top = 15
 236     logo_width = 140
 237
 238     bar_width = 35
 239     background_color = '#444'
 240     author_color = '#444'
 241     default_background = get_resource('res/cover.png')
 242     format = 'JPEG'
 243
 244     epoch_colors = {
 245         u'Starożytność': '#9e3610',
 246         u'Średniowiecze': '#564c09',
 247         u'Renesans': '#8ca629',
 248         u'Barok': '#a6820a',
 249         u'Oświecenie': '#f2802e',
 250         u'Romantyzm': '#db4b16',
 251         u'Pozytywizm': '#961060',
 252         u'Modernizm': '#7784e0',
 253         u'Dwudziestolecie międzywojenne': '#3044cf',
 254         u'Współczesność': '#06393d',
 255     }
 256
 257     def __init__(self, book_info, format=None, width=None, height=None, with_logo=False):
 258         super(WLCover, self).__init__(book_info, format=format, width=width, height=height)
 259         self.kind = book_info.kind
 260         self.epoch = book_info.epoch
 261         self.with_logo = with_logo
 262         if book_info.cover_url:
 263             url = book_info.cover_url
 264             bg_src = None
 265             if bg_src is None:
 266                 bg_src = URLOpener().open(url)
 267             self.background_img = StringIO(bg_src.read())
 268             bg_src.close()
 269         else:
 270             self.background_img = self.default_background
 271
 272     def pretty_author(self):
 273         return self.author.upper()
 274
 275     def image(self):
 276         metr = Metric(self, self.scale)
 277         img = Image.new('RGB', (metr.width, metr.height), self.background_color)
 278         draw = ImageDraw.Draw(img)
 279
 280         if self.epoch in self.epoch_colors:
 281             epoch_color = self.epoch_colors[self.epoch]
 282         else:
 283             epoch_color = '#000'
 284         draw.rectangle((0, 0, metr.bar_width, metr.height), fill=epoch_color)
 285
 286         if self.background_img:
 287             src = Image.open(self.background_img)
 288             trg_size = (metr.width - metr.bar_width, metr.height)
 289             if src.size[0] * trg_size[1] < src.size[1] * trg_size[0]:
 290                 resized = (
 291                     trg_size[0],
 292                     src.size[1] * trg_size[0] / src.size[0]
 293                 )
 294                 cut = (resized[1] - trg_size[1]) / 2
 295                 src = src.resize(resized, Image.ANTIALIAS)
 296                 src = src.crop((0, cut, src.size[0], src.size[1] - cut))
 297             else:
 298                 resized = (
 299                     src.size[0] * trg_size[1] / src.size[1],
 300                     trg_size[1],
 301                 )
 302                 cut = (resized[0] - trg_size[0]) / 2
 303                 src = src.resize(resized, Image.ANTIALIAS)
 304                 src = src.crop((cut, 0, src.size[0] - cut, src.size[1]))
 305
 306             img.paste(src, (metr.bar_width, 0))
 307             del src
 308
 309         box = TextBox(metr.title_box_width, metr.height, padding_y=metr.box_padding_y)
 310         author_font = ImageFont.truetype(
 311             self.author_font_ttf, metr.author_font_size)
 312         box.text(self.pretty_author(),
 313                  font=author_font,
 314                  line_height=metr.author_lineskip,
 315                  color=self.author_color,
 316                  shadow_color=self.author_shadow,
 317                 )
 318
 319         box.skip(metr.box_above_line)
 320         box.draw.line((metr.box_line_left, box.height, metr.box_line_right, box.height),
 321                 fill=self.author_color, width=metr.box_line_width)
 322         box.skip(metr.box_below_line)
 323
 324         title_font = ImageFont.truetype(
 325             self.title_font_ttf, metr.title_font_size)
 326         box.text(self.pretty_title(),
 327                  line_height=metr.title_lineskip,
 328                  font=title_font,
 329                  color=epoch_color,
 330                  shadow_color=self.title_shadow,
 331                 )
 332
 333         if self.with_logo:
 334             logo = Image.open(get_resource('res/wl-logo-mono.png'))
 335             logo = logo.resize((metr.logo_width, logo.size[1] * metr.logo_width / logo.size[0]), Image.ANTIALIAS)
 336             alpha = logo.split()[3]
 337             alpha = ImageEnhance.Brightness(alpha).enhance(.75)
 338             logo.putalpha(alpha)
 339             box.skip(metr.logo_top + logo.size[1])
 340
 341         box_img = box.image()
 342
 343         if self.kind == 'Liryka':
 344             # top
 345             box_top = metr.box_top_margin
 346         elif self.kind == 'Epika':
 347             # bottom
 348             box_top = metr.height - metr.box_bottom_margin - box_img.size[1]
 349         else:
 350             # center
 351             box_top = (metr.height - box_img.size[1]) / 2
 352
 353         box_left = metr.bar_width + (metr.width - metr.bar_width -
 354                         box_img.size[0]) / 2
 355         draw.rectangle((box_left, box_top,
 356             box_left + box_img.size[0], box_top + box_img.size[1]),
 357             fill='#fff')
 358         img.paste(box_img, (box_left, box_top), box_img)
 359
 360         if self.with_logo:
 361             img.paste(logo,
 362                 (box_left + (box_img.size[0] - logo.size[0]) / 2,
 363                     box_top + box_img.size[1] - metr.box_padding_y - logo.size[1]), mask=logo)
 364
 365         return img
 366
 367
 368 class VirtualoCover(Cover):
 369     width = 600
 370     height = 730
 371     author_top = 73
 372     title_top = 73
 373     logo_bottom = 25
 374     logo_width = 250
 375
 376
 377 class PrestigioCover(Cover):
 378     width = 580
 379     height = 783
 380     background_img = get_resource('res/cover-prestigio.png')
 381
 382     author_top = 446
 383     author_margin_left = 118
 384     author_margin_right = 62
 385     author_lineskip = 60
 386     author_color = '#fff'
 387     author_shadow = '#000'
 388     author_font_ttf = get_resource('fonts/JunicodeWL-Italic.ttf')
 389     author_font_size = 50
 390
 391     title_top = 0
 392     title_margin_left = 118
 393     title_margin_right = 62
 394     title_lineskip = 60
 395     title_color = '#fff'
 396     title_shadow = '#000'
 397     title_font_ttf = get_resource('fonts/JunicodeWL-Italic.ttf')
 398     title_font_size = 50
 399
 400     def pretty_title(self):
 401         return u"„%s”" % self.title
 402
 403
 404 class BookotekaCover(Cover):
 405     width = 2140
 406     height = 2733
 407     background_img = get_resource('res/cover-bookoteka.png')
 408
 409     author_top = 480
 410     author_margin_left = 307
 411     author_margin_right = 233
 412     author_lineskip = 156
 413     author_color = '#d9d919'
 414     author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 415     author_font_size = 130
 416
 417     title_top = 400
 418     title_margin_left = 307
 419     title_margin_right = 233
 420     title_lineskip = 168
 421     title_color = '#d9d919'
 422     title_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 423     title_font_size = 140
 424
 425     format = 'PNG'
 426
 427
 428 class GandalfCover(Cover):
 429     width = 600
 430     height = 730
 431     background_img = get_resource('res/cover-gandalf.png')
 432     author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 433     author_font_size = 30
 434     title_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
 435     title_font_size = 40
 436     logo_bottom = 25
 437     logo_width = 250
 438     format = 'PNG'