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 Image, ImageFont, ImageDraw, ImageFilter
   7 from librarian import get_resource
   8
   9
  10 class Cover(object):
  11     width = 600
  12     height = 800
  13     background_color = '#fff'
  14     background_img = None
  15
  16     author_top = 100
  17     author_margin_left = 20
  18     author_margin_right = 20
  19     author_lineskip = 40
  20     author_color = '#000'
  21     author_shadow = None
  22     author_font = None
  23
  24     title_top = 100
  25     title_margin_left = 20
  26     title_margin_right = 20
  27     title_lineskip = 54
  28     title_color = '#000'
  29     title_shadow = None
  30     title_font = None
  31
  32     logo_bottom = None
  33     logo_width = None
  34
  35     format = 'JPEG'
  36
  37
  38     exts = {
  39         'JPEG': 'jpg',
  40         'PNG': 'png',
  41         }
  42
  43     mime_types = {
  44         'JPEG': 'image/jpeg',
  45         'PNG': 'image/png',
  46         }
  47
  48
  49     @staticmethod
  50     def draw_centered_text(text, img, font, margin_left, width, pos_y, lineskip, color, shadow_color):
  51         if shadow_color:
  52             shadow_img = Image.new('RGBA', img.size)
  53             shadow_draw = ImageDraw.Draw(shadow_img)
  54         text_img = Image.new('RGBA', img.size)
  55         text_draw = ImageDraw.Draw(text_img)
  56         while text:
  57             line = text
  58             while text_draw.textsize(line, font=font)[0] > width:
  59                 try:
  60                     line, ext = line.rsplit(' ', 1)
  61                 except:
  62                     break
  63             pos_x = margin_left + (width - text_draw.textsize(line, font=font)[0]) / 2
  64             if shadow_color:
  65                 shadow_draw.text((pos_x + 3, pos_y + 3), line, font=font, fill=shadow_color)
  66             text_draw.text((pos_x, pos_y), line, font=font, fill=color)
  67             pos_y += lineskip
  68             text = text[len(line)+1:]
  69         if shadow_color:
  70             shadow_img = shadow_img.filter(ImageFilter.BLUR)
  71             img.paste(shadow_img, None, shadow_img)
  72         img.paste(text_img, None, text_img)
  73         return pos_y
  74
  75
  76     def __init__(self, author='', title=''):
  77         self.author = author
  78         self.title = title
  79
  80     def pretty_author(self):
  81         return self.author
  82
  83     def pretty_title(self):
  84         return self.title
  85
  86     def image(self):
  87         img = Image.new('RGB', (self.width, self.height), self.background_color)
  88
  89         if self.background_img:
  90             background = Image.open(self.background_img)
  91             img.paste(background, None, background)
  92             del background
  93
  94         # WL logo
  95         if self.logo_width:
  96             logo = Image.open(get_resource('res/wl-logo.png'))
  97             logo = logo.resize((self.logo_width, logo.size[1] * self.logo_width / logo.size[0]))
  98             img.paste(logo, ((self.width - self.logo_width) / 2, img.size[1] - logo.size[1] - self.logo_bottom))
  99
 100         author_font = self.author_font or ImageFont.truetype(get_resource('fonts/DejaVuSerif.ttf'), 30)
 101         title_y = self.draw_centered_text(self.pretty_author(), img, author_font,
 102                     self.author_margin_left, self.width - self.author_margin_left - self.author_margin_right, self.author_top,
 103                     self.author_lineskip, self.author_color, self.author_shadow) + self.title_top
 104         title_font = self.title_font or ImageFont.truetype(get_resource('fonts/DejaVuSerif.ttf'), 40)
 105         self.draw_centered_text(self.pretty_title(), img, title_font,
 106                     self.title_margin_left, self.width - self.title_margin_left - self.title_margin_right, title_y,
 107                     self.title_lineskip, self.title_color, self.title_shadow)
 108
 109         return img
 110
 111     def mime_type(self):
 112         return self.mime_types[self.format]
 113
 114     def ext(self):
 115         return self.exts[self.format]
 116
 117     def save(self, *args, **kwargs):
 118         return self.image().save(*args, format=self.format, **kwargs)
 119
 120
 121
 122 class VirtualoCover(Cover):
 123     width = 600
 124     height = 730
 125     author_top = 73
 126     title_top = 73
 127     logo_bottom = 0
 128     logo_width = 300
 129
 130
 131 class PrestigioCover(Cover):
 132     width = 580
 133     height = 783
 134     background_img = get_resource('res/cover-prestigio.png')
 135
 136     author_top = 446
 137     author_margin_left = 118
 138     author_margin_right = 62
 139     author_lineskip = 60
 140     author_color = '#fff'
 141     author_shadow = '#000'
 142     author_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Italic.ttf'), 50)
 143
 144     title_top = 0
 145     title_margin_left = 118
 146     title_margin_right = 62
 147     title_lineskip = 60
 148     title_color = '#fff'
 149     title_shadow = '#000'
 150     title_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Italic.ttf'), 50)
 151
 152     def pretty_title(self):
 153         return u"„%s”" % self.title
 154
 155
 156 class BookotekaCover(Cover):
 157     width = 2140
 158     height = 2733
 159     background_img = get_resource('res/cover-bookoteka.png')
 160
 161     author_top = 480
 162     author_margin_left = 307
 163     author_margin_right = 233
 164     author_lineskip = 156
 165     author_color = '#d9d919'
 166     author_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 130)
 167
 168     title_top = 400
 169     title_margin_left = 307
 170     title_margin_right = 233
 171     title_lineskip = 168
 172     title_color = '#d9d919'
 173     title_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 140)
 174
 175     format = 'PNG'