Simplify setting of covers in database and remove unneccessary Qt dependancy

src/calibre/gui2/convert/metadata.py

@@ -10,7 +10,7 @@ import os, uuid
 
 from PyQt4.Qt import QPixmap, SIGNAL
 
-from calibre.gui2 import choose_images, error_dialog, pixmap_to_data
+from calibre.gui2 import choose_images, error_dialog
 from calibre.gui2.convert.metadata_ui import Ui_Form
 from calibre.ebooks.metadata import authors_to_string, string_to_authors, \
         MetaInformation
@@ -185,7 +185,7 @@ class MetadataWidget(Widget, Ui_Form):
             opf.render(self.opf_file)
             self.opf_file.close()
             if self.cover_changed:
-                self.db.set_cover(self.book_id, pixmap_to_data(self.cover.pixmap()))
+                self.db.set_cover(self.book_id, self.cover.pixmap())
             cover = self.db.cover(self.book_id, index_is_id=True)
             if cover:
                 cf = PersistentTemporaryFile('.jpeg')

src/calibre/gui2/dialogs/metadata_single.py

@@ -16,7 +16,7 @@ from PyQt4.QtCore import SIGNAL, QObject, QCoreApplication, Qt, QTimer, QThread,
 from PyQt4.QtGui import QPixmap, QListWidgetItem, QErrorMessage, QDialog
 
 from calibre.gui2 import qstring_to_unicode, error_dialog, file_icon_provider, \
-                           choose_files, pixmap_to_data, choose_images, ResizableDialog
+                           choose_files, choose_images, ResizableDialog
 from calibre.gui2.dialogs.metadata_single_ui import Ui_MetadataSingleDialog
 from calibre.gui2.dialogs.fetch_metadata import FetchMetadata
 from calibre.gui2.dialogs.tag_editor import TagEditor
@@ -512,7 +512,7 @@ class MetadataSingleDialog(ResizableDialog, Ui_MetadataSingleDialog):
         self.db.set_pubdate(self.id, datetime(d.year(), d.month(), d.day()))
 
         if self.cover_changed:
-            self.db.set_cover(self.id, pixmap_to_data(self.cover.pixmap()))
+            self.db.set_cover(self.id, self.cover.pixmap())
         QDialog.accept(self)
         if callable(self.accepted_callback):
             self.accepted_callback(self.id)

src/calibre/library/database2.py

@@ -11,9 +11,15 @@ import os, re, sys, shutil, cStringIO, glob, collections, textwrap, \
 from itertools import repeat
 from datetime import datetime
 
-from PyQt4.QtCore import QCoreApplication, QThread, QReadWriteLock
-from PyQt4.QtGui import QApplication, QImage
-__app = None
+from PyQt4.QtCore import QThread, QReadWriteLock
+try:
+    from PIL import Image as PILImage
+    PILImage
+except ImportError:
+    import Image as PILImage
+
+
+from PyQt4.QtGui import QImage
 
 from calibre.ebooks.metadata import title_sort
 from calibre.library.database import LibraryDatabase
@@ -819,14 +825,11 @@ class LibraryDatabase2(LibraryDatabase):
         if callable(getattr(data, 'save', None)):
             data.save(path)
         else:
-            if not QCoreApplication.instance():
-                global __app
-                __app = QApplication([])
-            p = QImage()
-            if callable(getattr(data, 'read', None)):
-                data = data.read()
-            p.loadFromData(data)
-            p.save(path)
+            f = data
+            if not callable(getattr(data, 'read', None)):
+                f = cStringIO.StringIO(data)
+            im = PILImage.open(f)
+            im.convert('RGB').save(path, 'JPEG')
 
     def all_formats(self):
         formats = self.conn.get('SELECT format from data')
@@ -1528,6 +1531,7 @@ class LibraryDatabase2(LibraryDatabase):
         return data
 
     def migrate_old(self, db, progress):
+        from PyQt4.QtCore import QCoreApplication
         header = _(u'<p>Migrating old database to ebook library in %s<br><center>')%self.library_path
         progress.setValue(0)
         progress.setLabelText(header)