# 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
-from librarian import get_resource
+import re
+from PIL import Image, ImageFont, ImageDraw, ImageFilter
+from StringIO import StringIO
+from librarian import get_resource, IOFile
-def cover(width, height, author, title):
- def draw_centered_text(text, draw, font, width, pos_y, lineskip):
+class TextBox(object):
+ """Creates an Image with a series of centered strings."""
+
+ SHADOW_X = 3
+ SHADOW_Y = 3
+ SHADOW_BLUR = 3
+
+ def __init__(self, max_width, max_height, padding_x=None, padding_y=None):
+ if padding_x is None:
+ padding_x = self.SHADOW_X + self.SHADOW_BLUR
+ if padding_y is None:
+ padding_y = self.SHADOW_Y + self.SHADOW_BLUR
+
+ self.max_width = max_width
+ self.max_text_width = max_width - 2 * padding_x
+ self.padding_y = padding_y
+ self.height = padding_y
+ self.img = Image.new('RGBA', (max_width, max_height))
+ self.draw = ImageDraw.Draw(self.img)
+ self.shadow_img = None
+ self.shadow_draw = None
+
+ def skip(self, height):
+ """Skips some vertical space."""
+ self.height += height
+
+ def text(self, text, color='#000', font=None, line_height=20,
+ 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)
+ self.shadow_draw = ImageDraw.Draw(self.shadow_img)
while text:
line = text
- while draw.textsize(line, font=font)[0] > width:
- try:
- line, ext = line.rsplit(' ', 1)
- except:
+ line_width = self.draw.textsize(line, font=font)[0]
+ while line_width > self.max_text_width:
+ parts = line.rsplit(' ', 1)
+ if len(parts) == 1:
+ line_width = self.max_text_width
break
- draw.text(((img.size[0] - draw.textsize(line, font=font)[0]) / 2, pos_y), line, font=font, fill='#000')
- pos_y += lineskip
- text = text[len(line)+1:]
- return pos_y
+ line = parts[0]
+ line_width = self.draw.textsize(line, font=font)[0]
+ line = line.strip() + ' '
+
+ pos_x = (self.max_width - line_width) / 2
+
+ if shadow_color:
+ self.shadow_draw.text(
+ (pos_x + self.SHADOW_X, self.height + self.SHADOW_Y),
+ line, font=font, fill=shadow_color
+ )
+
+ self.draw.text((pos_x, self.height), line, font=font, fill=color)
+ self.height += line_height
+ # go to next line
+ text = text[len(line):]
+
+ def image(self):
+ """Creates the actual Image object."""
+ image = Image.new('RGBA', (self.max_width,
+ self.height + self.padding_y))
+ if self.shadow_img:
+ shadow = self.shadow_img.filter(ImageFilter.BLUR)
+ image.paste(shadow, (0, 0), shadow)
+ image.paste(self.img, (0, 0), self.img)
+ else:
+ image.paste(self.img, (0, 0))
+ return image
+
+
+class Cover(object):
+ """Abstract base class for cover images generator."""
+ width = 600
+ height = 800
+ background_color = '#fff'
+ background_img = None
+
+ author_top = 100
+ author_margin_left = 20
+ author_margin_right = 20
+ author_lineskip = 40
+ author_color = '#000'
+ author_shadow = None
+ author_font = None
+
+ title_top = 100
+ title_margin_left = 20
+ title_margin_right = 20
+ title_lineskip = 54
+ title_color = '#000'
+ title_shadow = None
+ title_font = None
+
+ logo_bottom = None
+ logo_width = None
+ uses_dc_cover = False
+
+ format = 'JPEG'
+
+ exts = {
+ 'JPEG': 'jpg',
+ 'PNG': 'png',
+ }
+
+ mime_types = {
+ 'JPEG': 'image/jpeg',
+ 'PNG': 'image/png',
+ }
+
+ def __init__(self, book_info, format=None):
+ self.author = ", ".join(auth.readable() for auth in book_info.authors)
+ self.title = book_info.title
+ if format is not None:
+ self.format = format
+
+ def pretty_author(self):
+ """Allows for decorating author's name."""
+ return self.author
+
+ def pretty_title(self):
+ """Allows for decorating title."""
+ return self.title
+
+ def image(self):
+ img = Image.new('RGB', (self.width, self.height), self.background_color)
+
+ if self.background_img:
+ background = Image.open(self.background_img)
+ img.paste(background, None, background)
+ del background
+
+ # WL logo
+ if self.logo_width:
+ 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))
+
+ top = self.author_top
+ tbox = TextBox(
+ self.width - self.author_margin_left - self.author_margin_right,
+ self.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)
+ text_img = tbox.image()
+ img.paste(text_img, (self.author_margin_left, top), text_img)
+
+ top += text_img.size[1] + self.title_top
+ tbox = TextBox(
+ self.width - self.title_margin_left - self.title_margin_right,
+ self.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)
+ text_img = tbox.image()
+ img.paste(text_img, (self.title_margin_left, top), text_img)
+ return img
- img = Image.new('RGB', (width, height), (255, 255, 255))
+ def mime_type(self):
+ return self.mime_types[self.format]
- # WL logo
- logo = Image.open(get_resource('pdf/wl-logo.png'))
- logo = logo.resize((img.size[0] / 2, logo.size[1] * img.size[0] / 2 / logo.size[0]))
- img.paste(logo, (width / 4, img.size[1] - logo.size[1]))
+ def ext(self):
+ return self.exts[self.format]
- draw = ImageDraw.Draw(img)
- author_font = ImageFont.truetype(get_resource('fonts/DejaVuSerif.ttf'), width/20)
- title_y = draw_centered_text(author, draw, author_font, width*9/10, height/10, width/15) + height/10
+ def save(self, *args, **kwargs):
+ return self.image().save(format=self.format, *args, **kwargs)
- title_font = ImageFont.truetype(get_resource('fonts/DejaVuSerif.ttf'), width/15)
- draw_centered_text(title, draw, title_font, width*9/10, title_y, width/11)
+ def output_file(self, *args, **kwargs):
+ imgstr = StringIO()
+ self.save(imgstr, *args, **kwargs)
+ return IOFile.from_string(imgstr.getvalue())
- return img
+ def for_pdf(self):
+ return IOFile.from_filename(get_resource('pdf/cover_image.sty'), {
+ 'cover.png': self.output_file(),
+ })
fnp / librarian.git / blobdiff