--- /dev/null
+# -*- coding: utf-8 -*-
+#
+# This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
+# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
+#
+import re
+from PIL import Image, ImageFont, ImageDraw, ImageFilter, ImageEnhance
+from StringIO import StringIO
+from librarian import DCNS, URLOpener
+from librarian.output import OutputFile
+from librarian.utils import get_resource
+from librarian.formats import Format
+
+
+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:
+ src = type(src)(self._scale * src)
+ return src
+
+
+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
+ 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
+ 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(Format):
+ """Base class for cover images generator."""
+ format_name = u"cover image"
+
+ 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_ttf = get_resource('fonts/DejaVuSerif.ttf')
+ author_font_size = 30
+
+ title_top = 100
+ title_margin_left = 20
+ title_margin_right = 20
+ title_lineskip = 54
+ title_color = '#000'
+ title_shadow = 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'
+ scale = 1
+
+ exts = {
+ 'JPEG': 'jpg',
+ 'PNG': 'png',
+ }
+
+ mime_types = {
+ 'JPEG': 'image/jpeg',
+ 'PNG': 'image/png',
+ }
+
+ def __init__(self, doc, format=None, width=None, height=None):
+ self.author = ", ".join(auth for auth in doc.meta.get(DCNS('creator')))
+ self.title = doc.meta.title()
+ if format is not None:
+ self.format = format
+ scale = max(float(width or 0) / self.width, float(height or 0) / self.height)
+ if scale:
+ self.scale = scale
+
+ 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):
+ 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)
+ img.paste(background, None, background)
+ del background
+
+ # WL logo
+ if metr.logo_width:
+ logo = Image.open(get_resource('res/wl-logo.png'))
+ 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 = metr.author_top
+ tbox = TextBox(
+ metr.width - metr.author_margin_left - metr.author_margin_right,
+ metr.height - top,
+ )
+
+ 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()
+ img.paste(text_img, (metr.author_margin_left, top), text_img)
+
+ top += text_img.size[1] + metr.title_top
+ tbox = TextBox(
+ metr.width - metr.title_margin_left - metr.title_margin_right,
+ metr.height - top,
+ )
+ 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()
+ img.paste(text_img, (metr.title_margin_left, top), text_img)
+
+ return img
+ imgstr = StringIO()
+ img.save(imgstr, format=self.format, quality=95)
+ OutputFile.from_string(imgstr.getvalue())
+
+ def mime_type(self):
+ return self.mime_types[self.format]
+
+ @property
+ def format_ext(self):
+ return self.exts[self.format]
+
+ def save(self, *args, **kwargs):
+ return self.image().save(format=self.format, quality=95, *args, **kwargs)
+
+ def build(self, *args, **kwargs):
+ imgstr = StringIO()
+ self.save(imgstr, *args, **kwargs)
+ return OutputFile.from_string(imgstr.getvalue())
fnp / librarian.git / blobdiff