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PDF Output: Yet another attempt at working around chromium's broken TTF embedding. Fixes #1907849 [conversion to pdf results in bizarre kerning](https://bugs.launchpad.net/calibre/+bug/1907849)
This has the advantage of making the merging code a lot simpler as well.
This commit is contained in:
Kovid Goyal
parent
22f200fd10
commit
e430bf3312
@ -116,8 +116,6 @@ def find_tests(which_tests=None, exclude_tests=None):
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a(find_tests())
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from calibre.ebooks.metadata.html import find_tests
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a(find_tests())
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from calibre.ebooks.pdf.test_html_writer import find_tests
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a(find_tests())
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from calibre.utils.xml_parse import find_tests
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a(find_tests())
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from calibre.gui2.viewer.annotations import find_tests
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@ -8,22 +8,19 @@
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import copy
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import json
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import os
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import re
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import signal
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import sys
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from collections import namedtuple
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from html5_parser import parse
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from io import BytesIO
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from itertools import count, repeat
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from operator import attrgetter, itemgetter
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from html5_parser import parse
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from PyQt5.Qt import (
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QApplication, QMarginsF, QObject, QPageLayout, Qt, QTimer, QUrl, pyqtSignal
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)
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from PyQt5.QtWebEngineCore import QWebEngineUrlRequestInterceptor
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from PyQt5.QtWebEngineWidgets import QWebEnginePage, QWebEngineProfile
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from calibre import detect_ncpus, prepare_string_for_xml, human_readable
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from calibre import detect_ncpus, human_readable, prepare_string_for_xml
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from calibre.constants import __version__, iswindows
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from calibre.ebooks.metadata.xmp import metadata_to_xmp_packet
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from calibre.ebooks.oeb.base import XHTML, XPath
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@ -45,9 +42,7 @@ from calibre.utils.podofo import (
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dedup_type3_fonts, get_podofo, remove_unused_fonts, set_metadata_implementation
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)
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from calibre.utils.short_uuid import uuid4
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from polyglot.builtins import (
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as_bytes, as_unicode, filter, iteritems, map, range, unicode_type
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)
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from polyglot.builtins import filter, iteritems, map, range, unicode_type
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from polyglot.urllib import urlparse
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OK, KILL_SIGNAL = range(0, 2)
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@ -769,182 +764,6 @@ def all_glyph_ids_in_w_arrays(arrays, as_set=False):
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return ans if as_set else sorted(ans)
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def merge_w_arrays(arrays):
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ranges = []
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for w in arrays:
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i = 0
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while i + 1 < len(w):
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elem = w[i]
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next_elem = w[i+1]
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if isinstance(next_elem, list):
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ranges.append(Range(elem, elem + len(next_elem) - 1, next_elem))
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i += 2
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elif i + 2 < len(w):
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ranges.append(Range(elem, next_elem, [w[i+2]]))
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i += 3
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else:
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break
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ranges.sort(key=attrgetter('sort_order'))
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merged_ranges = ranges[:1]
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for r in ranges[1:]:
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prev_range = merged_ranges[-1]
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left_over = prev_range.merge(r)
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if left_over is not None:
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merged_ranges.append(left_over)
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if not merged_ranges:
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return []
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ans = []
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for r in merged_ranges:
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ans.extend(r.as_item)
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return ans
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def width_map_from_w_array(w):
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ans = {}
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i = 0
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while i + 1 < len(w):
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elem = w[i]
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next_elem = w[i+1]
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if isinstance(next_elem, list):
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for gid, width in zip(range(elem, elem + len(next_elem)), next_elem):
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ans[gid] = width
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i += 2
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else:
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try:
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width = w[i+2]
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except IndexError:
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width = 0
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for gid in range(elem, next_elem + 1):
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ans[gid] = width
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i += 3
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return ans
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def merge_w_arrays_directly(arrays):
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width_maps = tuple(map(width_map_from_w_array, arrays))
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def getter(gid):
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return max(m.get(gid, 0) for m in width_maps)
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all_gids = set()
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for m in width_maps:
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all_gids |= set(m)
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widths = []
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for gid in sorted(all_gids):
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widths.extend((gid, gid, getter(gid)))
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return merge_w_arrays((widths,))
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class CMap(object):
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def __init__(self):
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self.start_codespace = sys.maxsize
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self.end_codespace = 0
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self.ranges = set()
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self.chars = set()
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self.header = self.footer = None
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def add_codespace(self, start, end):
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self.start_codespace = min(self.start_codespace, start)
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self.end_codespace = max(self.end_codespace, end)
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def serialize(self):
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chars = sorted(self.chars, key=itemgetter(0))
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def ashex(x):
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ans = '{:04X}'.format(x)
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leftover = len(ans) % 4
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if leftover:
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ans = ('0' * (4 - leftover)) + ans
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return ans
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lines = ['1 begincodespacerange', '<{}> <{}>'.format(*map(ashex, (self.start_codespace, self.end_codespace))), 'endcodespacerange']
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while chars:
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group, chars = chars[:100], chars[100:]
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lines.append('{} beginbfchar'.format(len(group)))
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for g in group:
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lines.append('<{}> <{}>'.format(*map(ashex, g)))
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lines.append('endbfchar')
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ranges = sorted(self.ranges, key=itemgetter(0))
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while ranges:
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group, ranges = ranges[:100], ranges[100:]
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lines.append('{} beginbfrange'.format(len(group)))
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for g in group:
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lines.append('<{}> <{}> <{}>'.format(*map(ashex, g)))
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lines.append('endbfrange')
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return self.header + '\n' + '\n'.join(lines) + '\n' + self.footer
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def merge_cmaps(cmaps):
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header, incmap, incodespace, inchar, inrange, footer = 'header cmap codespace char range footer'.split()
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start_pat = re.compile(r'\d+\s+begin(codespacerange|bfrange|bfchar)')
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ans = CMap()
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for cmap in cmaps:
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state = header
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headerlines = []
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footerlines = []
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prefix_ended = False
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for line in as_unicode(cmap, errors='replace').splitlines():
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line = line.strip()
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if state is header:
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headerlines.append(line)
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if line == 'begincmap':
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state = incmap
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continue
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if state is incmap:
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if line == 'endcmap':
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state = footer
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footerlines.append(line)
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continue
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m = start_pat.match(line)
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if m is not None:
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state = incodespace if m.group(1) == 'codespacerange' else (inchar if m.group(1) == 'bfchar' else inrange)
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prefix_ended = True
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continue
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if not prefix_ended:
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headerlines.append(line)
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continue
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if state is incodespace:
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if line == 'endcodespacerange':
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state = incmap
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else:
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s, e = line.split()
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s = int(s[1:-1], 16)
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e = int(e[1:-1], 16)
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ans.add_codespace(s, e)
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continue
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if state is inchar:
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if line == 'endbfchar':
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state = incmap
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else:
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a, b = line.split()
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a = int(a[1:-1], 16)
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b = int(b[1:-1], 16)
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ans.chars.add((a, b))
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continue
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if state is inrange:
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if line == 'endbfrange':
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state = incmap
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else:
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# technically bfrange can contain arrays for th eunicode
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# value but from looking at SkPDFFont.cpp in chromium, it
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# does not generate any
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a, b, u = line.split()
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a = int(a[1:-1], 16)
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b = int(b[1:-1], 16)
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u = int(u[1:-1], 16)
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ans.ranges.add((a, b, u))
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continue
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if state is footer:
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footerlines.append(line)
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if ans.header is None:
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ans.header = '\n'.join(headerlines)
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ans.footer = '\n'.join(footerlines)
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return ans.serialize()
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def fonts_are_identical(fonts):
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sentinel = object()
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for key in ('ToUnicode', 'Data', 'W', 'W2'):
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@ -957,27 +776,27 @@ def fonts_are_identical(fonts):
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return True
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def merge_font(fonts, log):
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def merge_font_files(fonts, log):
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# As of Qt 5.15.1 Chromium has switched to harfbuzz and dropped sfntly. It
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# now produces font descriptors whose W arrays dont match the glyph width
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# information from the hhea table, in contravention of the PDF spec. So
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# we can no longer merge font descriptors, all we can do is merge the
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# actual sfnt data streams into a single stream and subset it to contain
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# only the glyphs from all W arrays.
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# choose the largest font as the base font
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fonts.sort(key=lambda f: len(f['Data'] or b''), reverse=True)
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base_font = fonts[0]
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t0_font = next(f for f in fonts if f['DescendantFont'] == base_font['Reference'])
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descendant_fonts = [f for f in fonts if f['Subtype'] != 'Type0']
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t0_fonts = [f for f in fonts if f['Subtype'] == 'Type0']
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references_to_drop = tuple(f['Reference'] for f in fonts if f is not base_font and f is not t0_font)
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if fonts_are_identical(descendant_fonts):
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return t0_font, base_font, references_to_drop
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cmaps = list(filter(None, (f['ToUnicode'] for f in t0_fonts)))
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if cmaps:
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t0_font['ToUnicode'] = as_bytes(merge_cmaps(cmaps))
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base_font['sfnt'] = merge_truetype_fonts_for_pdf(tuple(f['sfnt'] for f in descendant_fonts), log)
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arrays = tuple(filter(None, (f['W'] for f in descendant_fonts)))
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if arrays:
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base_font['W'] = merge_w_arrays_directly(arrays)
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arrays = tuple(filter(None, (f['W2'] for f in descendant_fonts)))
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if arrays:
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base_font['W2'] = merge_w_arrays_directly(arrays)
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return t0_font, base_font, references_to_drop
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total_size = sum(len(f['Data']) for f in descendant_fonts)
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merged_sfnt = merge_truetype_fonts_for_pdf(tuple(f['sfnt'] for f in descendant_fonts), log)
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w_arrays = tuple(filter(None, (f['W'] for f in descendant_fonts)))
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glyph_ids = all_glyph_ids_in_w_arrays(w_arrays, as_set=True)
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h_arrays = tuple(filter(None, (f['W2'] for f in descendant_fonts)))
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glyph_ids |= all_glyph_ids_in_w_arrays(h_arrays, as_set=True)
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pdf_subset(merged_sfnt, glyph_ids)
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font_data = merged_sfnt()[0]
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log(f'Merged {len(fonts)} instances of {fonts[0]["BaseFont"]} reducing size from {human_readable(total_size)} to {human_readable(len(font_data))}')
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return font_data, tuple(f['Reference'] for f in descendant_fonts)
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def merge_fonts(pdf_doc, log):
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@ -1005,18 +824,10 @@ def merge_fonts(pdf_doc, log):
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for f in all_fonts:
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base_font_map.setdefault(f['BaseFont'], []).append(f)
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replacements = {}
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items = []
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for name, fonts in iteritems(base_font_map):
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if mergeable(fonts):
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t0_font, base_font, references_to_drop = merge_font(fonts, log)
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for ref in references_to_drop:
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replacements[ref] = t0_font['Reference']
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data = base_font['sfnt']()[0]
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items.append((
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base_font['Reference'], t0_font['Reference'], base_font['W'] or [], base_font['W2'] or [],
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data, t0_font['ToUnicode'] or b''))
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pdf_doc.merge_fonts(tuple(items), replacements)
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font_data, references = merge_font_files(fonts, log)
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pdf_doc.merge_fonts(font_data, references)
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def test_merge_fonts():
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@ -1024,28 +835,11 @@ def test_merge_fonts():
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podofo = get_podofo()
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pdf_doc = podofo.PDFDoc()
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pdf_doc.open(path)
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merge_fonts(pdf_doc)
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from calibre.utils.logging import default_log
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merge_fonts(pdf_doc, default_log)
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out = path.rpartition('.')[0] + '-merged.pdf'
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pdf_doc.save(out)
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print('Merged PDF written to', out)
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def subset_fonts(pdf_doc, log):
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all_fonts = pdf_doc.list_fonts(True)
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for font in all_fonts:
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if font['Subtype'] != 'Type0' and font['Data']:
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try:
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sfnt = Sfnt(font['Data'])
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except UnsupportedFont:
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continue
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if b'glyf' not in sfnt:
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continue
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num, gen = font['Reference']
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glyphs = all_glyph_ids_in_w_arrays((font['W'] or (), font['W2'] or ()), as_set=True)
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pdf_subset(sfnt, glyphs)
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data = sfnt()[0]
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log('Subset embedded font from: {} to {}'.format(human_readable(len(font['Data'])), human_readable(len(data))))
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pdf_doc.replace_font_data(data, num, gen)
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# }}}
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@ -1346,11 +1140,6 @@ def convert(opf_path, opts, metadata=None, output_path=None, log=default_log, co
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if num_removed:
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log('Removed', num_removed, 'unused fonts')
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# Originally added because of https://bugreports.qt.io/browse/QTBUG-88976
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# however even after that fix, calibre's font subsetting is superior to
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# harfbuzz, so continue to use it.
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subset_fonts(pdf_doc, log)
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num_removed = pdf_doc.dedup_images()
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if num_removed:
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log('Removed', num_removed, 'duplicate images')
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@ -1,58 +0,0 @@
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#!/usr/bin/env python
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# vim:fileencoding=utf-8
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# License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
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import unittest
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from .html_writer import merge_w_arrays, merge_cmaps
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class TestPDFWriter(unittest.TestCase):
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maxDiff = None
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def test_merge_w_arrays(self):
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self.assertEqual(merge_w_arrays(( # merge neighbor arrays
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[1, 3, 0.1], [3, [0.1, 0.2]])), [1, 3, 0.1, 4, 4, 0.2])
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self.assertEqual(merge_w_arrays(( # merge neighbor ranges
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[1, 5, 0.1], [6, 8, 0.1])), [1, 8, 0.1])
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self.assertEqual(merge_w_arrays(( # merge neighbor ranges
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[1, 5, 0.1], [6, 8, 0.2])), [1, 5, 0.1, 6, 8, 0.2])
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self.assertEqual(merge_w_arrays(( # disjoin overlap
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[1, 4, 0.1], [3, [0.1, 0.1, 0.2, 0.3]])), [1, 4, 0.1, 5, [0.2, 0.3]])
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self.assertEqual(merge_w_arrays(( # disjoin overlap
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[1, [0.1, 0.2]], [2, 4, 0.2])), [1, [0.1, 0.2], 3, 4, 0.2])
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self.assertEqual(merge_w_arrays(( # split overlapping arrays
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[1, [0.1, 0.2, 0.3]], [3, 5, 0.3])), [1, [0.1, 0.2, 0.3], 4, 5, 0.3])
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self.assertEqual(merge_w_arrays(( # merge overlapping ranges, using first width
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[1, 5, 0.1], [2, 4, 0.2])), [1, 5, 0.1])
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self.assertEqual(merge_w_arrays(( # merge overlapping arrays
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[1, [0.1, 0.1]], [3, [0.2, 0.2]])), [1, [0.1, 0.1, 0.2, 0.2]])
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self.assertEqual(merge_w_arrays((
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[1, 10, 99, 20, [1, 2, 3, 4]],
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[3, 10, 99, 11, 13, 77, 19, [77, 1]])),
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[1, 10, 99, 11, 13, 77, 19, [77, 1, 2, 3, 4]]
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)
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def test_merge_cmaps(self):
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roundtrip = '/CIDInit /ProcSet findresource begin\n12 dict begin\nbegincmap\n/CIDSystemInfo\n<< /Registry (Adobe)\n/Ordering (UCS)\n/Supplement 0\n>> def\n/CMapName /Adobe-Identity-UCS def\n/CMapType 2 def\n1 begincodespacerange\n<0000> <FFFF>\nendcodespacerange\n12 beginbfchar\n<0003> <0020>\n<000F> <002C>\n<0011> <002E>\n<0013> <0030>\n<001A> <0037>\n<002C> <0049>\n<002E> <004B>\n<0030> <004D>\n<003D> <005A>\n<0070> <201C>\n<007B> <00A0>\n<01AC> <FB01>\nendbfchar\n9 beginbfrange\n<000B> <000C> <0028>\n<0015> <0016> <0032>\n<0024> <0028> <0041>\n<0032> <0033> <004F>\n<0036> <0038> <0053>\n<003A> <003B> <0057>\n<0044> <004C> <0061>\n<004E> <0053> <006B>\n<0055> <005C> <0072>\nendbfrange\nendcmap\nCMapName currentdict /CMap defineresource pop\nend\nend' # noqa
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self.assertEqual(roundtrip, merge_cmaps((roundtrip,)))
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self.assertEqual(roundtrip, merge_cmaps((roundtrip, roundtrip)))
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res = merge_cmaps((
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'a\nbegincmap\nb\n1 begincodespacerange\n<0010> <00FF>\nendcodespacerange\n'
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'1 beginbfchar\n<0001> <0020>\nendbfchar\n1 beginbfrange\n<0002> <000a> <00021>\nendbfrange\nendcmap\nc',
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'x\nbegincmap\ny\n1 begincodespacerange\n<0001> <0100>\nendcodespacerange\n'
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'1 beginbfchar\n<0011> <0040>\nendbfchar\n1 beginbfrange\n<0012> <001a> <00051>\nendbfrange\nendcmap\nz'
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))
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self.assertEqual(
|
||||
'a\nbegincmap\nb\n1 begincodespacerange\n<0001> <0100>\nendcodespacerange\n'
|
||||
'2 beginbfchar\n<0001> <0020>\n<0011> <0040>\nendbfchar\n'
|
||||
'2 beginbfrange\n<0002> <000A> <0021>\n<0012> <001A> <0051>\nendbfrange\nendcmap\nc',
|
||||
res)
|
||||
|
||||
|
||||
def find_tests():
|
||||
return unittest.defaultTestLoader.loadTestsFromTestCase(TestPDFWriter)
|
||||
@ -325,63 +325,36 @@ replace_font_data(PDFDoc *self, PyObject *args) {
|
||||
|
||||
PyObject*
|
||||
merge_fonts(PDFDoc *self, PyObject *args) {
|
||||
PyObject *items, *replacements;
|
||||
if (!PyArg_ParseTuple(args, "O!O!", &PyTuple_Type, &items, &PyDict_Type, &replacements)) return NULL;
|
||||
std::unordered_map<uint64_t, uint64_t> ref_map;
|
||||
const char *data; Py_ssize_t sz;
|
||||
PyObject *references;
|
||||
if (!PyArg_ParseTuple(args, "y#O!", &data, &sz, &PyTuple_Type, &references)) return NULL;
|
||||
PdfVecObjects &objects = self->doc->GetObjects();
|
||||
PyObject *key, *value;
|
||||
Py_ssize_t pos = 0;
|
||||
size_t c = 0;
|
||||
while (PyDict_Next(replacements, &pos, &key, &value)) {
|
||||
c++;
|
||||
unsigned long num, gen;
|
||||
if (!PyArg_ParseTuple(key, "kk", &num, &gen)) return NULL;
|
||||
uint64_t k = ref_as_integer(static_cast<pdf_objnum>(num), static_cast<pdf_gennum>(gen));
|
||||
PdfReference ref(num, static_cast<pdf_gennum>(gen));
|
||||
PdfObject *font = objects.GetObject(ref);
|
||||
if (font) remove_font(objects, font);
|
||||
if (!PyArg_ParseTuple(value, "kk", &num, &gen)) return NULL;
|
||||
uint64_t v = ref_as_integer(num, static_cast<pdf_gennum>(gen));
|
||||
ref_map[k] = v;
|
||||
}
|
||||
if (c > 0) replace_font_references(self, ref_map);
|
||||
|
||||
for (Py_ssize_t i = 0; i < PyTuple_GET_SIZE(items); i++) {
|
||||
long num, gen, t0num, t0gen;
|
||||
PyObject *W, *W2;
|
||||
const char *data, *tounicode_data;
|
||||
Py_ssize_t sz, tounicode_sz;
|
||||
if (!PyArg_ParseTuple(PyTuple_GET_ITEM(items, i), "(ll)(ll)O!O!s#s#", &num, &gen, &t0num, &t0gen, &PyList_Type, &W, &PyList_Type, &W2, &data, &sz, &tounicode_data, &tounicode_sz)) return NULL;
|
||||
PdfReference ref(num, static_cast<pdf_gennum>(gen));
|
||||
PdfObject *font = objects.GetObject(ref);
|
||||
if (font) {
|
||||
if (PyObject_IsTrue(W)) {
|
||||
PdfArray w;
|
||||
convert_w_array(W, w);
|
||||
font->GetDictionary().AddKey("W", w);
|
||||
}
|
||||
if (PyObject_IsTrue(W2)) {
|
||||
PdfArray w;
|
||||
convert_w_array(W2, w);
|
||||
font->GetDictionary().AddKey("W2", w);
|
||||
}
|
||||
const PdfObject *descriptor = font->GetIndirectKey("FontDescriptor");
|
||||
if (descriptor) {
|
||||
PdfObject *ff = get_font_file(descriptor);
|
||||
PdfStream *stream = ff->GetStream();
|
||||
stream->Set(data, sz);
|
||||
}
|
||||
}
|
||||
if (tounicode_sz) {
|
||||
PdfObject *t0font = objects.GetObject(PdfReference(t0num, static_cast<pdf_gennum>(t0gen)));
|
||||
if (t0font) {
|
||||
PdfObject *s = t0font->GetIndirectKey("ToUnicode");
|
||||
if (!s) { PyErr_SetString(PyExc_ValueError, "Type0 font has no ToUnicode stream"); return NULL; }
|
||||
s->GetStream()->Set(tounicode_data, tounicode_sz);
|
||||
}
|
||||
}
|
||||
}
|
||||
Py_RETURN_NONE;
|
||||
PdfObject *font_file = NULL;
|
||||
for (Py_ssize_t i = 0; i < PyTuple_GET_SIZE(references); i++) {
|
||||
unsigned long num, gen;
|
||||
if (!PyArg_ParseTuple(PyTuple_GET_ITEM(references, i), "kk", &num, &gen)) return NULL;
|
||||
PdfObject *font = objects.GetObject(PdfReference(num, static_cast<pdf_gennum>(gen)));
|
||||
if (!font) { PyErr_SetString(PyExc_KeyError, "No font with the specified reference found"); return NULL; }
|
||||
PdfObject *dobj = font->GetIndirectKey("FontDescriptor");
|
||||
if (!dobj) { PyErr_SetString(PyExc_ValueError, "Font does not have a descriptor"); return NULL; }
|
||||
if (!dobj->IsDictionary()) { PyErr_SetString(PyExc_ValueError, "Font does not have a dictionary descriptor"); return NULL; }
|
||||
PdfDictionary &descriptor = dobj->GetDictionary();
|
||||
const char *font_file_key = NULL;
|
||||
if (descriptor.HasKey("FontFile")) font_file_key = "FontFile";
|
||||
else if (descriptor.HasKey("FontFile2")) font_file_key = "FontFile2";
|
||||
else if (descriptor.HasKey("FontFile3")) font_file_key = "FontFile3";
|
||||
else { PyErr_SetString(PyExc_ValueError, "Font descriptor does not have file data"); return NULL; }
|
||||
PdfObject *ff = dobj->GetIndirectKey(font_file_key);
|
||||
if (i == 0) {
|
||||
font_file = ff;
|
||||
PdfStream *stream = ff->GetStream();
|
||||
stream->Set(data, sz);
|
||||
} else {
|
||||
delete objects.RemoveObject(ff->Reference());
|
||||
descriptor.AddKey(font_file_key, font_file->Reference());
|
||||
}
|
||||
}
|
||||
Py_RETURN_NONE;
|
||||
}
|
||||
|
||||
class CharProc {
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user