PDF Output: On windows, remove any embedded fonts before generating the PDF as on windows, Qt generates image based PDFs when embedded fonts are present. Fixes #1053906 (The EPUB to PDF conversion generates the text of the EPUB file to a PDF file in graphic mode.)

src/calibre/ebooks/conversion/plugins/pdf_output.py

@@ -14,6 +14,8 @@ import os
 from calibre.customize.conversion import OutputFormatPlugin, \
     OptionRecommendation
 from calibre.ptempfile import TemporaryDirectory
+from calibre.constants import iswindows
+from calibre import walk
 
 UNITS = [
             'millimeter',
@@ -148,6 +150,14 @@ class PDFOutput(OutputFormatPlugin):
             oeb_output = plugin_for_output_format('oeb')
             oeb_output.convert(oeb_book, oeb_dir, self.input_plugin, self.opts, self.log)
 
+            if iswindows:
+                for f in walk(oeb_dir):
+                    if f.rpartition('.')[-1].lower() in {'ttf', 'otf'}:
+                        self.log.warn('Found embedded font %s, removing it, as '
+                                'embedded fonts on windows are not supported by '
+                                'the PDF Output plugin'%os.path.basename(f))
+                        os.remove(f)
+
             opfpath = glob.glob(os.path.join(oeb_dir, '*.opf'))[0]
             opf = OPF(opfpath, os.path.dirname(opfpath))
 

src/calibre/utils/fonts/embedflag.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
+from __future__ import (unicode_literals, division, absolute_import,
+                        print_function)
+
+__license__   = 'GPL v3'
+__copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
+__docformat__ = 'restructuredtext en'
+
+import sys, struct
+
+class UnsupportedFont(ValueError):
+    pass
+
+def remove_embed_restriction(raw):
+    sfnt_version = raw[:4]
+    if sfnt_version not in {b'\x00\x01\x00\x00', b'OTTO'}:
+        raise UnsupportedFont('Not a supported font, sfnt_version: %r'%sfnt_version)
+
+    num_tables = struct.unpack_from(b'>H', raw, 4)[0]
+
+    # Find OS/2 table
+    offset = 4 + 4*2 # Start of the Table record entries
+    os2_table_offset = None
+    for i in xrange(num_tables):
+        table_tag = raw[offset:offset+4]
+        offset += 16 # Size of a table record
+        if table_tag == b'OS/2':
+            os2_table_offset = struct.unpack_from(b'>I', raw, offset+8)[0]
+            break
+    if os2_table_offset is None:
+        raise UnsupportedFont('Not a supported font, has no OS/2 table')
+
+    version, = struct.unpack_from(b'>H', raw, os2_table_offset)
+
+    fs_type_offset = os2_table_offset + struct.calcsize(b'>HhHH')
+    fs_type = struct.unpack_from(b'>H', raw, fs_type_offset)[0]
+    if fs_type == 0:
+        return raw
+
+    return raw[:fs_type_offset] + struct.pack(b'>H', 0) + raw[fs_type_offset+2:]
+
+if __name__ == '__main__':
+    remove_embed_restriction(open(sys.argv[-1], 'rb').read())
+