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ebook-converter/ebook_converter/ebooks/covers.py
gryf 79cad46732 Added epub write support
2020-04-13 12:46:37 +02:00

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#!/usr/bin/env python2
# vim:fileencoding=utf-8
from __future__ import absolute_import, division, print_function, unicode_literals
__license__ = 'GPL v3'
__copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
import re, random, unicodedata, numbers
from collections import namedtuple
from contextlib import contextmanager
from math import ceil, sqrt, cos, sin, atan2
from polyglot.builtins import iteritems, itervalues, map, zip, string_or_bytes
from itertools import chain
from PyQt5.Qt import (
QImage, Qt, QFont, QPainter, QPointF, QTextLayout, QTextOption,
QFontMetrics, QTextCharFormat, QColor, QRect, QBrush, QLinearGradient,
QPainterPath, QPen, QRectF, QTransform, QRadialGradient
)
from calibre import force_unicode, fit_image
from calibre.constants import __appname__, __version__
from calibre.ebooks.metadata import fmt_sidx
from calibre.ebooks.metadata.book.base import Metadata
from calibre.ebooks.metadata.book.formatter import SafeFormat
from calibre.gui2 import ensure_app, config, load_builtin_fonts, pixmap_to_data
from calibre.utils.cleantext import clean_ascii_chars, clean_xml_chars
from calibre.utils.config import JSONConfig
# Default settings {{{
cprefs = JSONConfig('cover_generation')
cprefs.defaults['title_font_size'] = 120 # px
cprefs.defaults['subtitle_font_size'] = 80 # px
cprefs.defaults['footer_font_size'] = 80 # px
cprefs.defaults['cover_width'] = 1200 # px
cprefs.defaults['cover_height'] = 1600 # px
cprefs.defaults['title_font_family'] = None
cprefs.defaults['subtitle_font_family'] = None
cprefs.defaults['footer_font_family'] = None
cprefs.defaults['color_themes'] = {}
cprefs.defaults['disabled_color_themes'] = []
cprefs.defaults['disabled_styles'] = []
cprefs.defaults['title_template'] = '<b>{title}'
cprefs.defaults['subtitle_template'] = '''{series:'test($, strcat("<i>", $, "</i> - ", raw_field("formatted_series_index")), "")'}'''
cprefs.defaults['footer_template'] = r'''program:
# Show at most two authors, on separate lines.
authors = field('authors');
num = count(authors, ' &amp; ');
authors = sublist(authors, 0, 2, ' &amp; ');
authors = list_re(authors, ' &amp; ', '(.+)', '<b>\1');
authors = re(authors, ' &amp; ', '<br>');
re(authors, '&amp;&amp;', '&amp;')
'''
Prefs = namedtuple('Prefs', ' '.join(sorted(cprefs.defaults)))
_use_roman = None
def get_use_roman():
global _use_roman
if _use_roman is None:
return config['use_roman_numerals_for_series_number']
return _use_roman
def set_use_roman(val):
global _use_roman
_use_roman = bool(val)
# }}}
# Draw text {{{
Point = namedtuple('Point', 'x y')
def parse_text_formatting(text):
pos = 0
tokens = []
for m in re.finditer(r'</?([a-zA-Z1-6]+)/?>', text):
q = text[pos:m.start()]
if q:
tokens.append((False, q))
tokens.append((True, (m.group(1).lower(), '/' in m.group()[:2])))
pos = m.end()
if tokens:
if text[pos:]:
tokens.append((False, text[pos:]))
else:
tokens = [(False, text)]
ranges, open_ranges, text = [], [], []
offset = 0
for is_tag, tok in tokens:
if is_tag:
tag, closing = tok
if closing:
if open_ranges:
r = open_ranges.pop()
r[-1] = offset - r[-2]
if r[-1] > 0:
ranges.append(r)
else:
if tag in {'b', 'strong', 'i', 'em'}:
open_ranges.append([tag, offset, -1])
else:
offset += len(tok.replace('&amp;', '&'))
text.append(tok)
text = ''.join(text)
formats = []
for tag, start, length in chain(ranges, open_ranges):
fmt = QTextCharFormat()
if tag in {'b', 'strong'}:
fmt.setFontWeight(QFont.Bold)
elif tag in {'i', 'em'}:
fmt.setFontItalic(True)
else:
continue
if length == -1:
length = len(text) - start
if length > 0:
r = QTextLayout.FormatRange()
r.format = fmt
r.start, r.length = start, length
formats.append(r)
return text, formats
class Block(object):
def __init__(self, text='', width=0, font=None, img=None, max_height=100, align=Qt.AlignCenter):
self.layouts = []
self._position = Point(0, 0)
self.leading = self.line_spacing = 0
if font is not None:
fm = QFontMetrics(font, img)
self.leading = fm.leading()
self.line_spacing = fm.lineSpacing()
for text in text.split('<br>') if text else ():
text, formats = parse_text_formatting(sanitize(text))
l = QTextLayout(unescape_formatting(text), font, img)
l.setAdditionalFormats(formats)
to = QTextOption(align)
to.setWrapMode(QTextOption.WrapAtWordBoundaryOrAnywhere)
l.setTextOption(to)
l.beginLayout()
height = 0
while height + 3*self.leading < max_height:
line = l.createLine()
if not line.isValid():
break
line.setLineWidth(width)
height += self.leading
line.setPosition(QPointF(0, height))
height += line.height()
max_height -= height
l.endLayout()
if self.layouts:
self.layouts.append(self.leading)
else:
self._position = Point(l.position().x(), l.position().y())
self.layouts.append(l)
if self.layouts:
self.layouts.append(self.leading)
@property
def height(self):
return int(ceil(sum(l if isinstance(l, numbers.Number) else l.boundingRect().height() for l in self.layouts)))
@property
def position(self):
return self._position
@position.setter
def position(self, new_pos):
(x, y) = new_pos
self._position = Point(x, y)
if self.layouts:
self.layouts[0].setPosition(QPointF(x, y))
y += self.layouts[0].boundingRect().height()
for l in self.layouts[1:]:
if isinstance(l, numbers.Number):
y += l
else:
l.setPosition(QPointF(x, y))
y += l.boundingRect().height()
def draw(self, painter):
for l in self.layouts:
if hasattr(l, 'draw'):
# Etch effect for the text
painter.save()
painter.setRenderHints(QPainter.TextAntialiasing | QPainter.Antialiasing)
painter.save()
painter.setPen(QColor(255, 255, 255, 125))
l.draw(painter, QPointF(1, 1))
painter.restore()
l.draw(painter, QPointF())
painter.restore()
def layout_text(prefs, img, title, subtitle, footer, max_height, style):
width = img.width() - 2 * style.hmargin
title, subtitle, footer = title, subtitle, footer
title_font = QFont(prefs.title_font_family or 'Liberation Serif')
title_font.setPixelSize(prefs.title_font_size)
title_font.setStyleStrategy(QFont.PreferAntialias)
title_block = Block(title, width, title_font, img, max_height, style.TITLE_ALIGN)
title_block.position = style.hmargin, style.vmargin
subtitle_block = Block()
if subtitle:
subtitle_font = QFont(prefs.subtitle_font_family or 'Liberation Sans')
subtitle_font.setPixelSize(prefs.subtitle_font_size)
subtitle_font.setStyleStrategy(QFont.PreferAntialias)
gap = 2 * title_block.leading
mh = max_height - title_block.height - gap
subtitle_block = Block(subtitle, width, subtitle_font, img, mh, style.SUBTITLE_ALIGN)
subtitle_block.position = style.hmargin, title_block.position.y + title_block.height + gap
footer_font = QFont(prefs.footer_font_family or 'Liberation Serif')
footer_font.setStyleStrategy(QFont.PreferAntialias)
footer_font.setPixelSize(prefs.footer_font_size)
footer_block = Block(footer, width, footer_font, img, max_height, style.FOOTER_ALIGN)
footer_block.position = style.hmargin, img.height() - style.vmargin - footer_block.height
return title_block, subtitle_block, footer_block
# }}}
# Format text using templates {{{
def sanitize(s):
return unicodedata.normalize('NFC', clean_xml_chars(clean_ascii_chars(force_unicode(s or ''))))
_formatter = None
_template_cache = {}
def escape_formatting(val):
return val.replace('&', '&amp;').replace('<', '&lt;').replace('>', '&gt;')
def unescape_formatting(val):
return val.replace('&lt;', '<').replace('&gt;', '>').replace('&amp;', '&')
class Formatter(SafeFormat):
def get_value(self, orig_key, args, kwargs):
ans = SafeFormat.get_value(self, orig_key, args, kwargs)
return escape_formatting(ans)
def formatter():
global _formatter
if _formatter is None:
_formatter = Formatter()
return _formatter
def format_fields(mi, prefs):
f = formatter()
def safe_format(field):
return f.safe_format(
getattr(prefs, field), mi, _('Template error'), mi, template_cache=_template_cache
)
return map(safe_format, ('title_template', 'subtitle_template', 'footer_template'))
@contextmanager
def preserve_fields(obj, fields):
if isinstance(fields, string_or_bytes):
fields = fields.split()
null = object()
mem = {f:getattr(obj, f, null) for f in fields}
try:
yield
finally:
for f, val in iteritems(mem):
if val is null:
delattr(obj, f)
else:
setattr(obj, f, val)
def format_text(mi, prefs):
with preserve_fields(mi, 'authors formatted_series_index'):
mi.authors = [a for a in mi.authors if a != _('Unknown')]
mi.formatted_series_index = fmt_sidx(mi.series_index or 0, use_roman=get_use_roman())
return tuple(format_fields(mi, prefs))
# }}}
# Colors {{{
ColorTheme = namedtuple('ColorTheme', 'color1 color2 contrast_color1 contrast_color2')
def to_theme(x):
return {k:v for k, v in zip(ColorTheme._fields[:4], x.split())}
fallback_colors = to_theme('ffffff 000000 000000 ffffff')
default_color_themes = {
'Earth' : to_theme('e8d9ac c7b07b 564628 382d1a'),
'Grass' : to_theme('d8edb5 abc8a4 375d3b 183128'),
'Water' : to_theme('d3dcf2 829fe4 00448d 00305a'),
'Silver': to_theme('e6f1f5 aab3b6 6e7476 3b3e40'),
}
def theme_to_colors(theme):
colors = {k:QColor('#' + theme[k]) for k in ColorTheme._fields}
return ColorTheme(**colors)
def load_color_themes(prefs):
t = default_color_themes.copy()
t.update(prefs.color_themes)
disabled = frozenset(prefs.disabled_color_themes)
ans = [theme_to_colors(v) for k, v in iteritems(t) if k not in disabled]
if not ans:
# Ignore disabled and return only the builtin color themes
ans = [theme_to_colors(v) for k, v in iteritems(default_color_themes)]
return ans
def color(color_theme, name):
ans = getattr(color_theme, name)
if not ans.isValid():
ans = QColor('#' + fallback_colors[name])
return ans
# }}}
# Styles {{{
class Style(object):
TITLE_ALIGN = SUBTITLE_ALIGN = FOOTER_ALIGN = Qt.AlignHCenter | Qt.AlignTop
def __init__(self, color_theme, prefs):
self.load_colors(color_theme)
self.calculate_margins(prefs)
def calculate_margins(self, prefs):
self.hmargin = int((50 / 600) * prefs.cover_width)
self.vmargin = int((50 / 800) * prefs.cover_height)
def load_colors(self, color_theme):
self.color1 = color(color_theme, 'color1')
self.color2 = color(color_theme, 'color2')
self.ccolor1 = color(color_theme, 'contrast_color1')
self.ccolor2 = color(color_theme, 'contrast_color2')
class Cross(Style):
NAME = 'The Cross'
GUI_NAME = _('The Cross')
def __call__(self, painter, rect, color_theme, title_block, subtitle_block, footer_block):
painter.fillRect(rect, self.color1)
r = QRect(0, int(title_block.position.y), rect.width(),
title_block.height + subtitle_block.height + subtitle_block.line_spacing // 2 + title_block.leading)
painter.save()
p = QPainterPath()
p.addRoundedRect(QRectF(r), 10, 10 * r.width()/r.height(), Qt.RelativeSize)
painter.setClipPath(p)
painter.setRenderHint(QPainter.Antialiasing)
painter.fillRect(r, self.color2)
painter.restore()
r = QRect(0, 0, int(title_block.position.x), rect.height())
painter.fillRect(r, self.color2)
return self.ccolor2, self.ccolor2, self.ccolor1
class Half(Style):
NAME = 'Half and Half'
GUI_NAME = _('Half and half')
def __call__(self, painter, rect, color_theme, title_block, subtitle_block, footer_block):
g = QLinearGradient(QPointF(0, 0), QPointF(0, rect.height()))
g.setStops([(0, self.color1), (0.7, self.color2), (1, self.color1)])
painter.fillRect(rect, QBrush(g))
return self.ccolor1, self.ccolor1, self.ccolor1
def rotate_vector(angle, x, y):
return x * cos(angle) - y * sin(angle), x * sin(angle) + y * cos(angle)
def draw_curved_line(painter_path, dx, dy, c1_frac, c1_amp, c2_frac, c2_amp):
length = sqrt(dx * dx + dy * dy)
angle = atan2(dy, dx)
c1 = QPointF(*rotate_vector(angle, c1_frac * length, c1_amp * length))
c2 = QPointF(*rotate_vector(angle, c2_frac * length, c2_amp * length))
pos = painter_path.currentPosition()
painter_path.cubicTo(pos + c1, pos + c2, pos + QPointF(dx, dy))
class Banner(Style):
NAME = 'Banner'
GUI_NAME = _('Banner')
GRADE = 0.07
def calculate_margins(self, prefs):
Style.calculate_margins(self, prefs)
self.hmargin = int(0.15 * prefs.cover_width)
self.fold_width = int(0.1 * prefs.cover_width)
def __call__(self, painter, rect, color_theme, title_block, subtitle_block, footer_block):
painter.fillRect(rect, self.color1)
top = title_block.position.y + 2
extra_spacing = subtitle_block.line_spacing // 2 if subtitle_block.line_spacing else title_block.line_spacing // 3
height = title_block.height + subtitle_block.height + extra_spacing + title_block.leading
right = rect.right() - self.hmargin
width = right - self.hmargin
# Draw main banner
p = main = QPainterPath(QPointF(self.hmargin, top))
draw_curved_line(p, rect.width() - 2 * self.hmargin, 0, 0.1, -0.1, 0.9, -0.1)
deltax = self.GRADE * height
p.lineTo(right + deltax, top + height)
right_corner = p.currentPosition()
draw_curved_line(p, - width - 2 * deltax, 0, 0.1, 0.05, 0.9, 0.05)
left_corner = p.currentPosition()
p.closeSubpath()
# Draw fold rectangles
rwidth = self.fold_width
yfrac = 0.1
width23 = int(0.67 * rwidth)
rtop = top + height * yfrac
def draw_fold(x, m=1, corner=left_corner):
ans = p = QPainterPath(QPointF(x, rtop))
draw_curved_line(p, rwidth*m, 0, 0.1, 0.1*m, 0.5, -0.2*m)
fold_upper = p.currentPosition()
p.lineTo(p.currentPosition() + QPointF(-deltax*m, height))
fold_corner = p.currentPosition()
draw_curved_line(p, -rwidth*m, 0, 0.2, -0.1*m, 0.8, -0.1*m)
draw_curved_line(p, deltax*m, -height, 0.2, 0.1*m, 0.8, 0.1*m)
p = inner_fold = QPainterPath(corner)
dp = fold_corner - p.currentPosition()
draw_curved_line(p, dp.x(), dp.y(), 0.5, 0.3*m, 1, 0*m)
p.lineTo(fold_upper), p.closeSubpath()
return ans, inner_fold
left_fold, left_inner = draw_fold(self.hmargin - width23)
right_fold, right_inner = draw_fold(right + width23, m=-1, corner=right_corner)
painter.save()
painter.setRenderHint(QPainter.Antialiasing)
pen = QPen(self.ccolor2)
pen.setWidth(3)
pen.setJoinStyle(Qt.RoundJoin)
painter.setPen(pen)
for r in (left_fold, right_fold):
painter.fillPath(r, QBrush(self.color2))
painter.drawPath(r)
for r in (left_inner, right_inner):
painter.fillPath(r, QBrush(self.color2.darker()))
painter.drawPath(r)
painter.fillPath(main, QBrush(self.color2))
painter.drawPath(main)
painter.restore()
return self.ccolor2, self.ccolor2, self.ccolor1
class Ornamental(Style):
NAME = 'Ornamental'
GUI_NAME = _('Ornamental')
# SVG vectors {{{
CORNER_VECTOR = "m 67.791903,64.260958 c -4.308097,-2.07925 -4.086719,-8.29575 0.334943,-9.40552 4.119758,-1.03399 8.732363,5.05239 5.393055,7.1162 -0.55,0.33992 -1,1.04147 -1,1.55902 0,1.59332 2.597425,1.04548 5.365141,-1.1316 1.999416,-1.57274 2.634859,-2.96609 2.634859,-5.7775 0,-9.55787 -9.827495,-13.42961 -24.43221,-9.62556 -3.218823,0.83839 -5.905663,1.40089 -5.970755,1.25 -0.06509,-0.1509 -0.887601,-1.19493 -1.827799,-2.32007 -1.672708,-2.00174 -1.636693,-2.03722 1.675668,-1.65052 1.861815,0.21736 6.685863,-0.35719 10.720107,-1.27678 12.280767,-2.79934 20.195487,-0.0248 22.846932,8.0092 3.187273,9.65753 -6.423297,17.7497 -15.739941,13.25313 z m 49.881417,-20.53932 c -3.19204,-2.701 -3.72967,-6.67376 -1.24009,-9.16334 2.48236,-2.48236 5.35141,-2.67905 7.51523,-0.51523 1.85966,1.85966 2.07045,6.52954 0.37143,8.22857 -2.04025,2.04024 3.28436,1.44595 6.92316,-0.77272 9.66959,-5.89579 0.88581,-18.22422 -13.0777,-18.35516 -5.28594,-0.0496 -10.31098,1.88721 -14.26764,5.4991 -1.98835,1.81509 -2.16454,1.82692 -2.7936,0.18763 -0.40973,-1.06774 0.12141,-2.82197 1.3628,-4.50104 2.46349,-3.33205 1.67564,-4.01299 -2.891784,-2.49938 -2.85998,0.94777 -3.81038,2.05378 -5.59837,6.51495 -1.184469,2.95536 -3.346819,6.86882 -4.805219,8.69657 -1.4584,1.82776 -2.65164,4.02223 -2.65164,4.87662 0,3.24694 -4.442667,0.59094 -5.872557,-3.51085 -1.361274,-3.90495 0.408198,-8.63869 4.404043,-11.78183 5.155844,-4.05558 1.612374,-3.42079 -9.235926,1.65457 -12.882907,6.02725 -16.864953,7.18038 -24.795556,7.18038 -8.471637,0 -13.38802,-1.64157 -17.634617,-5.88816 -2.832233,-2.83224 -3.849773,-4.81378 -4.418121,-8.6038 -1.946289,-12.9787795 8.03227,-20.91713135 19.767685,-15.7259993 5.547225,2.4538018 6.993631,6.1265383 3.999564,10.1557393 -5.468513,7.35914 -15.917883,-0.19431 -10.657807,-7.7041155 1.486298,-2.1219878 1.441784,-2.2225068 -0.984223,-2.2225068 -1.397511,0 -4.010527,1.3130878 -5.806704,2.9179718 -2.773359,2.4779995 -3.265777,3.5977995 -3.265777,7.4266705 0,5.10943 2.254112,8.84197 7.492986,12.40748 8.921325,6.07175 19.286666,5.61396 37.12088,-1.63946 15.35037,-6.24321 21.294999,-7.42408 34.886123,-6.92999 11.77046,0.4279 19.35803,3.05537 24.34054,8.42878 4.97758,5.3681 2.53939,13.58271 -4.86733,16.39873 -4.17361,1.58681 -11.00702,1.19681 -13.31978,-0.76018 z m 26.50156,-0.0787 c -2.26347,-2.50111 -2.07852,-7.36311 0.39995,-10.51398 2.68134,-3.40877 10.49035,-5.69409 18.87656,-5.52426 l 6.5685,0.13301 -7.84029,0.82767 c -8.47925,0.89511 -12.76997,2.82233 -16.03465,7.20213 -1.92294,2.57976 -1.96722,3.00481 -0.57298,5.5 1.00296,1.79495 2.50427,2.81821 4.46514,3.04333 2.92852,0.33623 2.93789,0.32121 1.08045,-1.73124 -1.53602,-1.69728 -1.64654,-2.34411 -0.61324,-3.58916 2.84565,-3.4288 7.14497,-0.49759 5.03976,3.43603 -1.86726,3.48903 -8.65528,4.21532 -11.3692,1.21647 z m -4.17462,-14.20302 c -0.38836,-0.62838 -0.23556,-1.61305 0.33954,-2.18816 1.3439,-1.34389 4.47714,-0.17168 3.93038,1.47045 -0.5566,1.67168 -3.38637,2.14732 -4.26992,0.71771 z m -8.48037,-9.1829 c -12.462,-4.1101 -12.53952,-4.12156 -25.49998,-3.7694 -24.020921,0.65269 -32.338219,0.31756 -37.082166,-1.49417 -5.113999,-1.95305 -8.192504,-6.3647405 -6.485463,-9.2940713 0.566827,-0.972691 1.020091,-1.181447 1.037211,-0.477701 0.01685,0.692606 1.268676,1.2499998 2.807321,1.2499998 1.685814,0 4.868609,1.571672 8.10041,4.0000015 4.221481,3.171961 6.182506,3.999221 9.473089,3.996261 l 4.149585,-0.004 -3.249996,-1.98156 c -3.056252,-1.863441 -4.051566,-3.8760635 -2.623216,-5.3044145 0.794,-0.794 6.188222,1.901516 9.064482,4.5295635 1.858669,1.698271 3.461409,1.980521 10.559493,1.859621 11.30984,-0.19266 20.89052,1.29095 31.97905,4.95208 7.63881,2.52213 11.51931,3.16471 22.05074,3.65141 7.02931,0.32486 13.01836,0.97543 13.30902,1.44571 0.29065,0.47029 -5.2356,0.83436 -12.28056,0.80906 -12.25942,-0.044 -13.34537,-0.2229 -25.30902,-4.16865 z" # noqa
# }}}
PATH_CACHE = {}
VIEWPORT = (400, 500)
def calculate_margins(self, prefs):
self.hmargin = int((51 / self.VIEWPORT[0]) * prefs.cover_width)
self.vmargin = int((83 / self.VIEWPORT[1]) * prefs.cover_height)
def __call__(self, painter, rect, color_theme, title_block, subtitle_block, footer_block):
if not self.PATH_CACHE:
from calibre.utils.speedups import svg_path_to_painter_path
try:
self.__class__.PATH_CACHE['corner'] = svg_path_to_painter_path(self.CORNER_VECTOR)
except Exception:
import traceback
traceback.print_exc()
p = painter
painter.setRenderHint(QPainter.Antialiasing)
g = QRadialGradient(QPointF(rect.center()), rect.width())
g.setColorAt(0, self.color1), g.setColorAt(1, self.color2)
painter.fillRect(rect, QBrush(g))
painter.save()
painter.setWindow(0, 0, *self.VIEWPORT)
try:
path = self.PATH_CACHE['corner']
except KeyError:
path = QPainterPath()
pen = p.pen()
pen.setColor(self.ccolor1)
p.setPen(pen)
def corner():
b = QBrush(self.ccolor1)
p.fillPath(path, b)
p.rotate(90), p.translate(100, -100), p.scale(1, -1), p.translate(-103, -97)
p.fillPath(path, b)
p.setWorldTransform(QTransform())
# Top-left corner
corner()
# Top right corner
p.scale(-1, 1), p.translate(-400, 0), corner()
# Bottom left corner
p.scale(1, -1), p.translate(0, -500), corner()
# Bottom right corner
p.scale(-1, -1), p.translate(-400, -500), corner()
for y in (28.4, 471.7):
p.drawLine(QPointF(160, y), QPointF(240, y))
for x in (31.3, 368.7):
p.drawLine(QPointF(x, 155), QPointF(x, 345))
pen.setWidthF(1.8)
p.setPen(pen)
for y in (23.8, 476.7):
p.drawLine(QPointF(160, y), QPointF(240, y))
for x in (26.3, 373.7):
p.drawLine(QPointF(x, 155), QPointF(x, 345))
painter.restore()
return self.ccolor2, self.ccolor2, self.ccolor1
class Blocks(Style):
NAME = 'Blocks'
GUI_NAME = _('Blocks')
FOOTER_ALIGN = Qt.AlignRight | Qt.AlignTop
def __call__(self, painter, rect, color_theme, title_block, subtitle_block, footer_block):
painter.fillRect(rect, self.color1)
y = rect.height() - rect.height() // 3
r = QRect(rect)
r.setBottom(y)
painter.fillRect(rect, self.color1)
r = QRect(rect)
r.setTop(y)
painter.fillRect(r, self.color2)
return self.ccolor1, self.ccolor1, self.ccolor2
def all_styles():
return set(
x.NAME for x in itervalues(globals()) if
isinstance(x, type) and issubclass(x, Style) and x is not Style
)
def load_styles(prefs, respect_disabled=True):
disabled = frozenset(prefs.disabled_styles) if respect_disabled else ()
ans = tuple(x for x in itervalues(globals()) if
isinstance(x, type) and issubclass(x, Style) and x is not Style and x.NAME not in disabled)
if not ans and disabled:
# If all styles have been disabled, ignore the disabling and return all
# the styles
ans = load_styles(prefs, respect_disabled=False)
return ans
# }}}
def init_environment():
ensure_app()
load_builtin_fonts()
def generate_cover(mi, prefs=None, as_qimage=False):
init_environment()
prefs = prefs or cprefs
prefs = {k:prefs.get(k) for k in cprefs.defaults}
prefs = Prefs(**prefs)
color_theme = random.choice(load_color_themes(prefs))
style = random.choice(load_styles(prefs))(color_theme, prefs)
title, subtitle, footer = format_text(mi, prefs)
img = QImage(prefs.cover_width, prefs.cover_height, QImage.Format_ARGB32)
title_block, subtitle_block, footer_block = layout_text(
prefs, img, title, subtitle, footer, img.height() // 3, style)
p = QPainter(img)
rect = QRect(0, 0, img.width(), img.height())
colors = style(p, rect, color_theme, title_block, subtitle_block, footer_block)
for block, color in zip((title_block, subtitle_block, footer_block), colors):
p.setPen(color)
block.draw(p)
p.end()
img.setText('Generated cover', '%s %s' % (__appname__, __version__))
if as_qimage:
return img
return pixmap_to_data(img)
def override_prefs(base_prefs, **overrides):
ans = {k:overrides.get(k, base_prefs[k]) for k in cprefs.defaults}
override_color_theme = overrides.get('override_color_theme')
if override_color_theme is not None:
all_themes = set(default_color_themes) | set(ans['color_themes'])
if override_color_theme in all_themes:
all_themes.discard(override_color_theme)
ans['disabled_color_themes'] = all_themes
override_style = overrides.get('override_style')
if override_style is not None:
styles = all_styles()
if override_style in styles:
styles.discard(override_style)
ans['disabled_styles'] = styles
return ans
def create_cover(title, authors, series=None, series_index=1, prefs=None, as_qimage=False):
' Create a cover from the specified title, author and series. Any user set'
' templates are ignored, to ensure that the specified metadata is used. '
mi = Metadata(title, authors)
if series:
mi.series, mi.series_index = series, series_index
d = cprefs.defaults
prefs = override_prefs(
prefs or cprefs, title_template=d['title_template'], subtitle_template=d['subtitle_template'], footer_template=d['footer_template'])
return generate_cover(mi, prefs=prefs, as_qimage=as_qimage)
def calibre_cover2(title, author_string='', series_string='', prefs=None, as_qimage=False, logo_path=None):
init_environment()
title, subtitle, footer = '<b>' + escape_formatting(title), '<i>' + escape_formatting(series_string), '<b>' + escape_formatting(author_string)
prefs = prefs or cprefs
prefs = {k:prefs.get(k) for k in cprefs.defaults}
scale = 800. / prefs['cover_height']
scale_cover(prefs, scale)
prefs = Prefs(**prefs)
img = QImage(prefs.cover_width, prefs.cover_height, QImage.Format_ARGB32)
img.fill(Qt.white)
# colors = to_theme('ffffff ffffff 000000 000000')
color_theme = theme_to_colors(fallback_colors)
class CalibeLogoStyle(Style):
NAME = GUI_NAME = 'calibre'
def __call__(self, painter, rect, color_theme, title_block, subtitle_block, footer_block):
top = title_block.position.y + 10
extra_spacing = subtitle_block.line_spacing // 2 if subtitle_block.line_spacing else title_block.line_spacing // 3
height = title_block.height + subtitle_block.height + extra_spacing + title_block.leading
top += height + 25
bottom = footer_block.position.y - 50
logo = QImage(logo_path or I('library.png'))
pwidth, pheight = rect.width(), bottom - top
scaled, width, height = fit_image(logo.width(), logo.height(), pwidth, pheight)
x, y = (pwidth - width) // 2, (pheight - height) // 2
rect = QRect(x, top + y, width, height)
painter.setRenderHint(QPainter.SmoothPixmapTransform)
painter.drawImage(rect, logo)
return self.ccolor1, self.ccolor1, self.ccolor1
style = CalibeLogoStyle(color_theme, prefs)
title_block, subtitle_block, footer_block = layout_text(
prefs, img, title, subtitle, footer, img.height() // 3, style)
p = QPainter(img)
rect = QRect(0, 0, img.width(), img.height())
colors = style(p, rect, color_theme, title_block, subtitle_block, footer_block)
for block, color in zip((title_block, subtitle_block, footer_block), colors):
p.setPen(color)
block.draw(p)
p.end()
img.setText('Generated cover', '%s %s' % (__appname__, __version__))
if as_qimage:
return img
return pixmap_to_data(img)
def message_image(text, width=500, height=400, font_size=20):
init_environment()
img = QImage(width, height, QImage.Format_ARGB32)
img.fill(Qt.white)
p = QPainter(img)
f = QFont()
f.setPixelSize(font_size)
p.setFont(f)
r = img.rect().adjusted(10, 10, -10, -10)
p.drawText(r, Qt.AlignJustify | Qt.AlignVCenter | Qt.TextWordWrap, text)
p.end()
return pixmap_to_data(img)
def scale_cover(prefs, scale):
for x in ('cover_width', 'cover_height', 'title_font_size', 'subtitle_font_size', 'footer_font_size'):
prefs[x] = int(scale * prefs[x])
def generate_masthead(title, output_path=None, width=600, height=60, as_qimage=False, font_family=None):
init_environment()
font_family = font_family or cprefs['title_font_family'] or 'Liberation Serif'
img = QImage(width, height, QImage.Format_ARGB32)
img.fill(Qt.white)
p = QPainter(img)
p.setRenderHints(QPainter.Antialiasing | QPainter.TextAntialiasing)
f = QFont(font_family)
f.setStyleStrategy(QFont.PreferAntialias)
f.setPixelSize((height * 3) // 4), f.setBold(True)
p.setFont(f)
p.drawText(img.rect(), Qt.AlignLeft | Qt.AlignVCenter, sanitize(title))
p.end()
if as_qimage:
return img
data = pixmap_to_data(img)
if output_path is None:
return data
with open(output_path, 'wb') as f:
f.write(data)
def test(scale=0.25):
from PyQt5.Qt import QLabel, QPixmap, QMainWindow, QWidget, QScrollArea, QGridLayout
from calibre.gui2 import Application
app = Application([])
mi = Metadata('Unknown', ['Kovid Goyal', 'John & Doe', 'Author'])
mi.series = 'A series & styles'
m = QMainWindow()
sa = QScrollArea(m)
w = QWidget(m)
sa.setWidget(w)
l = QGridLayout(w)
w.setLayout(l), l.setSpacing(30)
scale *= w.devicePixelRatioF()
labels = []
for r, color in enumerate(sorted(default_color_themes)):
for c, style in enumerate(sorted(all_styles())):
mi.series_index = c + 1
mi.title = 'An algorithmic cover [%s]' % color
prefs = override_prefs(cprefs, override_color_theme=color, override_style=style)
scale_cover(prefs, scale)
img = generate_cover(mi, prefs=prefs, as_qimage=True)
img.setDevicePixelRatio(w.devicePixelRatioF())
la = QLabel()
la.setPixmap(QPixmap.fromImage(img))
l.addWidget(la, r, c)
labels.append(la)
m.setCentralWidget(sa)
w.resize(w.sizeHint())
m.show()
app.exec_()
if __name__ == '__main__':
test()
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