fix chapter titles in toc

[librarian.git] / librarian / cover.py

diff --git a/librarian/cover.py b/librarian/cover.py
index 0416628..6390f8a 100644 (file)
--- a/librarian/cover.py
+++ b/librarian/cover.py
@@ -3,8 +3,24 @@
 # This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #
 # This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #

-import Image, ImageFont, ImageDraw, ImageFilter
-from librarian import get_resource
+import re
+from PIL import Image, ImageFont, ImageDraw, ImageFilter
+from StringIO import StringIO
+from librarian import get_resource, OutputFile, URLOpener
+
+
+class Metric(object):
+    """Gets metrics from an object, scaling it by a factor."""
+    def __init__(self, obj, scale):
+        self._obj = obj
+        self._scale = float(scale)
+
+    def __getattr__(self, name):
+        src = getattr(self._obj, name)
+        if src and self._scale:
+            return type(src)(self._scale * src)
+        else:
+            return src

 
 
 class TextBox(object):
 
 
 class TextBox(object):


@@ -33,9 +49,10 @@ class TextBox(object):
         """Skips some vertical space."""
         self.height += height
 
         """Skips some vertical space."""
         self.height += height
 

-    def text(self, text, color='#000', font=None, line_height=20, 
+    def text(self, text, color='#000', font=None, line_height=20,

              shadow_color=None):
         """Writes some centered text."""
              shadow_color=None):
         """Writes some centered text."""

+        text = re.sub(r'\s+', ' ', text)

         if shadow_color:
             if not self.shadow_img:
                 self.shadow_img = Image.new('RGBA', self.img.size)
         if shadow_color:
             if not self.shadow_img:
                 self.shadow_img = Image.new('RGBA', self.img.size)


@@ -91,7 +108,8 @@ class Cover(object):
     author_lineskip = 40
     author_color = '#000'
     author_shadow = None
     author_lineskip = 40
     author_color = '#000'
     author_shadow = None

-    author_font = None
+    author_font_ttf = get_resource('fonts/DejaVuSerif.ttf')
+    author_font_size = 30

 
     title_top = 100
     title_margin_left = 20
 
     title_top = 100
     title_margin_left = 20


@@ -99,13 +117,16 @@ class Cover(object):
     title_lineskip = 54
     title_color = '#000'
     title_shadow = None
     title_lineskip = 54
     title_color = '#000'
     title_shadow = None

-    title_font = None
+    title_font_ttf = get_resource('fonts/DejaVuSerif.ttf')
+    title_font_size = 40

 
     logo_bottom = None
     logo_width = None
     uses_dc_cover = False
 
     format = 'JPEG'
 
     logo_bottom = None
     logo_width = None
     uses_dc_cover = False
 
     format = 'JPEG'

+    scale = 1
+    scale_after = 1

 
     exts = {
         'JPEG': 'jpg',
 
     exts = {
         'JPEG': 'jpg',


@@ -117,9 +138,18 @@ class Cover(object):
         'PNG': 'image/png',
         }
 
         'PNG': 'image/png',
         }
 

-    def __init__(self, book_info):
+    def __init__(self, book_info, format=None, width=None, height=None):

         self.author = ", ".join(auth.readable() for auth in book_info.authors)
         self.title = book_info.title
         self.author = ", ".join(auth.readable() for auth in book_info.authors)
         self.title = book_info.title

+        if format is not None:
+            self.format = format
+        if width and height:
+            self.height = height * self.width / width
+        scale = max(float(width or 0) / self.width, float(height or 0) / self.height)
+        if scale >= 1:
+            self.scale = scale
+        elif scale:
+            self.scale_after = scale

 
     def pretty_author(self):
         """Allows for decorating author's name."""
 
     def pretty_author(self):
         """Allows for decorating author's name."""


@@ -130,7 +160,8 @@ class Cover(object):
         return self.title
 
     def image(self):
         return self.title
 
     def image(self):

-        img = Image.new('RGB', (self.width, self.height), self.background_color)
+        metr = Metric(self, self.scale)
+        img = Image.new('RGB', (metr.width, metr.height), self.background_color)

 
         if self.background_img:
             background = Image.open(self.background_img)
 
         if self.background_img:
             background = Image.open(self.background_img)


@@ -138,35 +169,43 @@ class Cover(object):
             del background
 
         # WL logo
             del background
 
         # WL logo

-        if self.logo_width:
+        if metr.logo_width:

             logo = Image.open(get_resource('res/wl-logo.png'))
             logo = Image.open(get_resource('res/wl-logo.png'))

-            logo = logo.resize((self.logo_width, logo.size[1] * self.logo_width / logo.size[0]))
-            img.paste(logo, ((self.width - self.logo_width) / 2, img.size[1] - logo.size[1] - self.logo_bottom))
+            logo = logo.resize((metr.logo_width, logo.size[1] * metr.logo_width / logo.size[0]))
+            img.paste(logo, ((metr.width - metr.logo_width) / 2, img.size[1] - logo.size[1] - metr.logo_bottom))

 
 

-        top = self.author_top
+        top = metr.author_top

         tbox = TextBox(
         tbox = TextBox(

-            self.width - self.author_margin_left - self.author_margin_right,
-            self.height - top,
+            metr.width - metr.author_margin_left - metr.author_margin_right,
+            metr.height - top,

             )
             )

-        author_font = self.author_font or ImageFont.truetype(
-            get_resource('fonts/DejaVuSerif.ttf'), 30)
-        tbox.text(self.pretty_author(), self.author_color, author_font,
-            self.author_lineskip, self.author_shadow)
+            
+        author_font = ImageFont.truetype(
+            self.author_font_ttf, metr.author_font_size)
+        tbox.text(self.pretty_author(), self.author_color, author_font, metr.author_lineskip, self.author_shadow)

         text_img = tbox.image()
         text_img = tbox.image()

-        img.paste(text_img, (self.author_margin_left, top), text_img)
-        
-        top += text_img.size[1] + self.title_top
+        img.paste(text_img, (metr.author_margin_left, top), text_img)
+
+        top += text_img.size[1] + metr.title_top

         tbox = TextBox(
         tbox = TextBox(

-            self.width - self.title_margin_left - self.title_margin_right,
-            self.height - top,
+            metr.width - metr.title_margin_left - metr.title_margin_right,
+            metr.height - top,

             )
             )

-        title_font = self.author_font or ImageFont.truetype(
-            get_resource('fonts/DejaVuSerif.ttf'), 40)
-        tbox.text(self.pretty_title(), self.title_color, title_font,
-            self.title_lineskip, self.title_shadow)
+        title_font = ImageFont.truetype(
+            self.title_font_ttf, metr.title_font_size)
+        tbox.text(self.pretty_title(), self.title_color, title_font, metr.title_lineskip, self.title_shadow)

         text_img = tbox.image()
         text_img = tbox.image()

-        img.paste(text_img, (self.title_margin_left, top), text_img)
+        img.paste(text_img, (metr.title_margin_left, top), text_img)
+
+        return img

 
 

+    def final_image(self):
+        img = self.image()
+        if self.scale_after != 1:
+            img = img.resize((
+                    int(round(img.size[0] * self.scale_after)),
+                    int(round(img.size[1] * self.scale_after))),
+                Image.ANTIALIAS)

         return img
 
     def mime_type(self):
         return img
 
     def mime_type(self):


@@ -176,78 +215,184 @@ class Cover(object):
         return self.exts[self.format]
 
     def save(self, *args, **kwargs):
         return self.exts[self.format]
 
     def save(self, *args, **kwargs):

-        return self.image().save(format=self.format, *args, **kwargs)
+        default_kwargs = {
+                'format': self.format,
+                'quality': 95,
+        }
+        default_kwargs.update(kwargs)
+        return self.final_image().save(*args, **default_kwargs)
+
+    def output_file(self, *args, **kwargs):
+        imgstr = StringIO()
+        self.save(imgstr, *args, **kwargs)
+        return OutputFile.from_string(imgstr.getvalue())

 
 
 class WLCover(Cover):
 
 
 class WLCover(Cover):

-    """Default Wolne Lektury cover generator."""
+    """Wolne Lektury cover without logos."""
+    width = 600
+    height = 833

     uses_dc_cover = True
     uses_dc_cover = True

-    author_font = ImageFont.truetype(
-        get_resource('fonts/JunicodeWL-Regular.ttf'), 20)
+    author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
+    author_font_size = 20

     author_lineskip = 30
     author_lineskip = 30

-    title_font = ImageFont.truetype(
-        get_resource('fonts/DejaVuSerif-Bold.ttf'), 30)
+    title_font_ttf = get_resource('fonts/DejaVuSerif-Bold.ttf')
+    title_font_size = 30

     title_lineskip = 40
     title_box_width = 350
     title_lineskip = 40
     title_box_width = 350

+
+    box_top_margin = 100
+    box_bottom_margin = 100
+    box_padding_y = 20
+    box_above_line = 10
+    box_below_line = 15
+    box_line_left = 75
+    box_line_right = 275
+    box_line_width = 2
+
+    logo_top = 15
+    logo_width = 140
+

     bar_width = 35
     bar_width = 35

+    bar_color = '#000'
+    box_position = 'middle'

     background_color = '#444'
     author_color = '#444'
     background_color = '#444'
     author_color = '#444'

-    default_background = get_resource('res/background.jpg')
+    background_img = get_resource('res/cover.png')

     format = 'JPEG'
 
     format = 'JPEG'
 

-    epochs = {
-        u'Starożytność': 0,
-        u'Średniowiecze': 30,
-        u'Renesans': 60,
-        u'Barok': 90,
-        u'Oświecenie': 120,
-        u'Romantyzm': 150,
-        u'Pozytywizm': 180,
-        u'Modernizm': 210,
-        u'Dwudziestolecie międzywojenne': 240,
-        u'Współczesność': 270,
+    epoch_colors = {
+        u'Starożytność': '#9e3610',
+        u'Średniowiecze': '#564c09',
+        u'Renesans': '#8ca629',
+        u'Barok': '#a6820a',
+        u'Oświecenie': '#f2802e',
+        u'Romantyzm': '#db4b16',
+        u'Pozytywizm': '#961060',
+        u'Modernizm': '#7784e0',
+        u'Dwudziestolecie międzywojenne': '#3044cf',
+        u'Współczesność': '#06393d',

     }
 
     }
 

-    def __init__(self, book_info):
-        super(WLCover, self).__init__(book_info)
-        self.kind = book_info.kind
-        self.epoch = book_info.epoch
-        if book_info.cover_url:
-            from urllib2 import urlopen
-            from StringIO import StringIO
+    kind_box_position = {
+        u'Liryka': 'top',
+        u'Epika': 'bottom',
+    }
+
+    def __init__(self, book_info, format=None, width=None, height=None, bleed=0):
+        super(WLCover, self).__init__(book_info, format=format, width=width, height=height)
+        # Set box position.
+        self.box_position = book_info.cover_box_position or \
+            self.kind_box_position.get(book_info.kind, self.box_position)
+        # Set bar color.
+        if book_info.cover_bar_color == 'none':
+            self.bar_width = 0
+        else:
+            self.bar_color = book_info.cover_bar_color or \
+                self.epoch_colors.get(book_info.epoch, self.bar_color)
+        # Set title color.
+        self.title_color = self.epoch_colors.get(book_info.epoch, self.title_color)
+
+        self.bleed = bleed
+        self.box_top_margin += bleed
+        self.box_bottom_margin += bleed
+        self.bar_width += bleed

 
 

-            bg_src = urlopen(book_info.cover_url)
+        if book_info.cover_url:
+            url = book_info.cover_url
+            bg_src = None
+            if bg_src is None:
+                bg_src = URLOpener().open(url)

             self.background_img = StringIO(bg_src.read())
             bg_src.close()
             self.background_img = StringIO(bg_src.read())
             bg_src.close()

-        else:
-            self.background_img = self.default_background

 
     def pretty_author(self):
         return self.author.upper()
 
 
     def pretty_author(self):
         return self.author.upper()
 

-    def image(self):
-        from colorsys import hsv_to_rgb
+    def add_box(self, img):
+        if self.box_position == 'none':
+            return img
+
+        metr = Metric(self, self.scale)
+
+        # Write author name.
+        box = TextBox(metr.title_box_width, metr.height, padding_y=metr.box_padding_y)
+        author_font = ImageFont.truetype(
+            self.author_font_ttf, metr.author_font_size)
+        box.text(self.pretty_author(),
+                 font=author_font,
+                 line_height=metr.author_lineskip,
+                 color=self.author_color,
+                 shadow_color=self.author_shadow)
+
+        box.skip(metr.box_above_line)
+        box.draw.line((metr.box_line_left, box.height, metr.box_line_right, box.height),
+                      fill=self.author_color, width=metr.box_line_width)
+        box.skip(metr.box_below_line)
+
+        # Write title.
+        title_font = ImageFont.truetype(
+            self.title_font_ttf, metr.title_font_size)
+        box.text(self.pretty_title(),
+                 line_height=metr.title_lineskip,
+                 font=title_font,
+                 color=self.title_color,
+                 shadow_color=self.title_shadow)
+
+        box_img = box.image()
+
+        # Find box position.
+        if self.box_position == 'top':
+            box_top = metr.box_top_margin
+        elif self.box_position == 'bottom':
+            box_top = metr.height - metr.box_bottom_margin - box_img.size[1]
+        else:   # Middle.
+            box_top = (metr.height - box_img.size[1]) / 2
+
+        box_left = metr.bar_width + (metr.width - metr.bar_width - box_img.size[0]) / 2
+
+        # Draw the white box.
+        ImageDraw.Draw(img).rectangle(
+            (box_left, box_top, box_left + box_img.size[0], box_top + box_img.size[1]), fill='#fff')
+        # Paste the contents into the white box.
+        img.paste(box_img, (box_left, box_top), box_img)
+        return img

 
 

-        img = Image.new('RGB', (self.width, self.height), self.background_color)
+    def add_cut_lines(self, img):
+        line_ratio = 0.5
+        if self.bleed == 0:
+            return img
+        metr = Metric(self, self.scale)

         draw = ImageDraw.Draw(img)
         draw = ImageDraw.Draw(img)

+        for corner_x, corner_y in ((0, 0), (metr.width, 0), (0, metr.height), (metr.width, metr.height)):
+            dir_x = 1 if corner_x == 0 else -1
+            dir_y = 1 if corner_y == 0 else -1
+            for offset in (-1, 0, 1):
+                draw.line((corner_x, corner_y + dir_y * metr.bleed + offset,
+                           corner_x + dir_x * metr.bleed * line_ratio, corner_y + dir_y * metr.bleed + offset),
+                          fill='black' if offset == 0 else 'white', width=1)
+                draw.line((corner_x + dir_x * metr.bleed + offset, corner_y,
+                           corner_x + dir_x * metr.bleed + offset, corner_y + dir_y * metr.bleed * line_ratio),
+                          fill='black' if offset == 0 else 'white', width=1)
+        return img

 
 

-        if self.epoch in self.epochs:
-            epoch_color = tuple(int(255 * c) for c in hsv_to_rgb(
-                    float(self.epochs[self.epoch]) / 360, .7, .7))
-        else:
-            epoch_color = '#000'
-        draw.rectangle((0, 0, self.bar_width, self.height), fill=epoch_color)
+    def image(self):
+        metr = Metric(self, self.scale)
+        img = Image.new('RGB', (metr.width, metr.height), self.background_color)
+        draw = ImageDraw.Draw(img)
+
+        draw.rectangle((0, 0, metr.bar_width, metr.height), fill=self.bar_color)

 
         if self.background_img:
             src = Image.open(self.background_img)
 
         if self.background_img:
             src = Image.open(self.background_img)

-            trg_size = (self.width - self.bar_width, self.height)
+            trg_size = (metr.width - metr.bar_width, metr.height)

             if src.size[0] * trg_size[1] < src.size[1] * trg_size[0]:
                 resized = (
                     trg_size[0],
                     src.size[1] * trg_size[0] / src.size[0]
                 )
                 cut = (resized[1] - trg_size[1]) / 2
             if src.size[0] * trg_size[1] < src.size[1] * trg_size[0]:
                 resized = (
                     trg_size[0],
                     src.size[1] * trg_size[0] / src.size[0]
                 )
                 cut = (resized[1] - trg_size[1]) / 2

-                src = src.resize(resized)
+                src = src.resize(resized, Image.ANTIALIAS)

                 src = src.crop((0, cut, src.size[0], src.size[1] - cut))
             else:
                 resized = (
                 src = src.crop((0, cut, src.size[0], src.size[1] - cut))
             else:
                 resized = (


@@ -255,53 +400,76 @@ class WLCover(Cover):
                     trg_size[1],
                 )
                 cut = (resized[0] - trg_size[0]) / 2
                     trg_size[1],
                 )
                 cut = (resized[0] - trg_size[0]) / 2

-                src = src.resize(resized)
+                src = src.resize(resized, Image.ANTIALIAS)

                 src = src.crop((cut, 0, src.size[0] - cut, src.size[1]))
                 src = src.crop((cut, 0, src.size[0] - cut, src.size[1]))

-            
-            img.paste(src, (self.bar_width, 0))
+
+            img.paste(src, (metr.bar_width, 0))

             del src
 
             del src
 

-        box = TextBox(self.title_box_width, self.height, padding_y=20)
-        box.text(self.pretty_author(), 
-                 font=self.author_font,
-                 line_height=self.author_lineskip,
-                 color=self.author_color,
-                 shadow_color=self.author_shadow,
-                )
+        img = self.add_box(img)

 
 

-        box.skip(10)
-        box.draw.line((75, box.height, 275, box.height), 
-                fill=self.author_color, width=2)
-        box.skip(15)
+        # img = self.add_cut_lines(img)

 
 

-        box.text(self.pretty_title(),
-                 line_height=self.title_lineskip,
-                 font=self.title_font,
-                 color=epoch_color,
-                 shadow_color=self.title_shadow,
-                )
-        box_img = box.image()
+        return img

 
 

-        if self.kind == 'Liryka':
-            # top
-            box_top = 100
-        elif self.kind == 'Epika':
-            # bottom
-            box_top = self.height - 100 - box_img.size[1]
-        else:
-            # center
-            box_top = (self.height - box_img.size[1]) / 2
-
-        box_left = self.bar_width + (self.width - self.bar_width - 
-                        box_img.size[0]) / 2
-        draw.rectangle((box_left, box_top, 
-            box_left + box_img.size[0], box_top + box_img.size[1]),
-            fill='#fff')
-        img.paste(box_img, (box_left, box_top), box_img)

 
 

+class WLNoBoxCover(WLCover):
+    def add_box(self, img):

         return img
 
 
         return img
 
 

+class LogoWLCover(WLCover):
+    gradient_height = 90
+    gradient_logo_height = 60
+    gradient_logo_margin_right = 30
+    gradient_logo_spacing = 40
+    gradient_color = '#000'
+    gradient_opacity = .6
+    gradient_logos = [
+        'res/wl-logo-white.png',
+        'res/fnp-logo-white.png',
+    ]
+
+    def __init__(self, *args, **kwargs):
+        super(LogoWLCover, self).__init__(*args, **kwargs)
+        self.gradient_height += self.bleed
+        self.gradient_logo_margin_right += self.bleed
+
+    def image(self):
+        img = super(LogoWLCover, self).image()
+        metr = Metric(self, self.scale)
+        gradient = Image.new('RGBA', (metr.width - metr.bar_width, metr.gradient_height), self.gradient_color)
+        gradient_mask = Image.new('L', (metr.width - metr.bar_width, metr.gradient_height))
+        draw = ImageDraw.Draw(gradient_mask)
+        for line in range(0, metr.gradient_height):
+            draw.line(
+                (0, line, metr.width - metr.bar_width, line),
+                fill=int(255 * self.gradient_opacity * line / metr.gradient_height))
+        img.paste(gradient, (metr.bar_width, metr.height - metr.gradient_height), mask=gradient_mask)
+
+        cursor = metr.width - metr.gradient_logo_margin_right
+        logo_top = metr.height - metr.gradient_height / 2 - metr.gradient_logo_height / 2 - metr.bleed / 2
+        for logo_path in self.gradient_logos[::-1]:
+            logo = Image.open(get_resource(logo_path))
+            logo = logo.resize(
+                (logo.size[0] * metr.gradient_logo_height / logo.size[1], metr.gradient_logo_height),
+                Image.ANTIALIAS)
+            cursor -= logo.size[0]
+            img.paste(logo, (cursor, logo_top), mask=logo)
+            cursor -= metr.gradient_logo_spacing
+
+        return img
+
+
+class EbookpointCover(LogoWLCover):
+    gradient_logo_height = 58
+    gradient_logo_spacing = 25
+    gradient_logos = [
+        'res/ebookpoint-logo-white.png',
+        'res/wl-logo-white.png',
+        'res/fnp-logo-white.png',
+    ]
+

 
 class VirtualoCover(Cover):
     width = 600
 
 class VirtualoCover(Cover):
     width = 600


@@ -323,7 +491,8 @@ class PrestigioCover(Cover):
     author_lineskip = 60
     author_color = '#fff'
     author_shadow = '#000'
     author_lineskip = 60
     author_color = '#fff'
     author_shadow = '#000'

-    author_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Italic.ttf'), 50)
+    author_font_ttf = get_resource('fonts/JunicodeWL-Italic.ttf')
+    author_font_size = 50

 
     title_top = 0
     title_margin_left = 118
 
     title_top = 0
     title_margin_left = 118


@@ -331,7 +500,8 @@ class PrestigioCover(Cover):
     title_lineskip = 60
     title_color = '#fff'
     title_shadow = '#000'
     title_lineskip = 60
     title_color = '#fff'
     title_shadow = '#000'

-    title_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Italic.ttf'), 50)
+    title_font_ttf = get_resource('fonts/JunicodeWL-Italic.ttf')
+    title_font_size = 50

 
     def pretty_title(self):
         return u"„%s”" % self.title
 
     def pretty_title(self):
         return u"„%s”" % self.title


@@ -347,14 +517,16 @@ class BookotekaCover(Cover):
     author_margin_right = 233
     author_lineskip = 156
     author_color = '#d9d919'
     author_margin_right = 233
     author_lineskip = 156
     author_color = '#d9d919'

-    author_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 130)
+    author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
+    author_font_size = 130

 
     title_top = 400
     title_margin_left = 307
     title_margin_right = 233
     title_lineskip = 168
     title_color = '#d9d919'
 
     title_top = 400
     title_margin_left = 307
     title_margin_right = 233
     title_lineskip = 168
     title_color = '#d9d919'

-    title_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 140)
+    title_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
+    title_font_size = 140

 
     format = 'PNG'
 
 
     format = 'PNG'
 


@@ -363,8 +535,42 @@ class GandalfCover(Cover):
     width = 600
     height = 730
     background_img = get_resource('res/cover-gandalf.png')
     width = 600
     height = 730
     background_img = get_resource('res/cover-gandalf.png')

-    author_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 30)
-    title_font = ImageFont.truetype(get_resource('fonts/JunicodeWL-Regular.ttf'), 40)
+    author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
+    author_font_size = 30
+    title_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf')
+    title_font_size = 40

     logo_bottom = 25
     logo_width = 250
     format = 'PNG'
     logo_bottom = 25
     logo_width = 250
     format = 'PNG'

+
+
+class KMLUCover(LogoWLCover):
+    gradient_logo_height = 58
+    gradient_logo_spacing = 25
+    gradient_logos = [
+        'res/kmlu-logo-white.png',
+        'res/wl-logo-white.png',
+        'res/fnp-logo-white.png',
+    ]
+
+
+class MPWCover(LogoWLCover):
+    gradient_logo_height = 58
+    gradient_logo_spacing = 25
+    gradient_logos = [
+        'res/mpw-logo-white.png',
+        'res/wl-logo-white.png',
+        'res/fnp-logo-white.png',
+    ]
+
+
+COVER_CLASSES = {
+    'default': LogoWLCover,
+    'kmlu': KMLUCover,
+    'mpw': MPWCover,
+}
+
+
+def make_cover(book_info, *args, **kwargs):
+    cover_class = COVER_CLASSES[book_info.cover_class]
+    return cover_class(book_info, *args, **kwargs)