X-Git-Url: https://git.mdrn.pl/librarian.git/blobdiff_plain/1e438727014e352799b4dfb8d3dfb2f8e7a58251..3b0b98465bc1862306b05bb8305a1abbf40ca310:/librarian/cover.py diff --git a/librarian/cover.py b/librarian/cover.py index a7fc674..2320f19 100644 --- a/librarian/cover.py +++ b/librarian/cover.py @@ -3,37 +3,193 @@ # 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): + try: + self.author = ", ".join(auth.readable() for auth in book_info.authors) + except AttributeError: + self.author = "" + 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(), + })