# -*- 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 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): """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(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_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 scale_after = 1 exts = { 'JPEG': 'jpg', 'PNG': 'png', } mime_types = { 'JPEG': 'image/jpeg', 'PNG': 'image/png', } 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 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.""" 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 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 self.mime_types[self.format] def ext(self): return self.exts[self.format] def save(self, *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): """Wolne Lektury cover without logos.""" width = 600 height = 833 uses_dc_cover = True author_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf') author_font_size = 20 author_lineskip = 30 title_font_ttf = get_resource('fonts/DejaVuSerif-Bold.ttf') title_font_size = 30 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_color = '#000' box_position = 'middle' background_color = '#444' author_color = '#444' background_img = get_resource('res/cover.png') format = 'JPEG' 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', } 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 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() def pretty_author(self): return self.author.upper() 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 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) 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 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) 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 src = src.resize(resized, Image.ANTIALIAS) src = src.crop((0, cut, src.size[0], src.size[1] - cut)) else: resized = ( src.size[0] * trg_size[1] / src.size[1], trg_size[1], ) cut = (resized[0] - trg_size[0]) / 2 src = src.resize(resized, Image.ANTIALIAS) src = src.crop((cut, 0, src.size[0] - cut, src.size[1])) img.paste(src, (metr.bar_width, 0)) del src img = self.add_box(img) # img = self.add_cut_lines(img) return img class WLNoBoxCover(WLCover): def add_box(self, 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 height = 730 author_top = 73 title_top = 73 logo_bottom = 25 logo_width = 250 class PrestigioCover(Cover): width = 580 height = 783 background_img = get_resource('res/cover-prestigio.png') author_top = 446 author_margin_left = 118 author_margin_right = 62 author_lineskip = 60 author_color = '#fff' author_shadow = '#000' author_font_ttf = get_resource('fonts/JunicodeWL-Italic.ttf') author_font_size = 50 title_top = 0 title_margin_left = 118 title_margin_right = 62 title_lineskip = 60 title_color = '#fff' title_shadow = '#000' title_font_ttf = get_resource('fonts/JunicodeWL-Italic.ttf') title_font_size = 50 def pretty_title(self): return u"„%s”" % self.title class BookotekaCover(Cover): width = 2140 height = 2733 background_img = get_resource('res/cover-bookoteka.png') author_top = 480 author_margin_left = 307 author_margin_right = 233 author_lineskip = 156 author_color = '#d9d919' 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_font_ttf = get_resource('fonts/JunicodeWL-Regular.ttf') title_font_size = 140 format = 'PNG' class GandalfCover(Cover): width = 600 height = 730 background_img = get_resource('res/cover-gandalf.png') 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' 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)