Add an option for maximum size of covers transmitted via the content server

src/calibre/gui2/dialogs/choose_format.py

@@ -1,7 +1,7 @@
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 
-from PyQt4.QtGui import QDialog, QListWidgetItem
+from PyQt4.Qt import QDialog, QListWidgetItem, SIGNAL
 
 from calibre.gui2 import file_icon_provider
 from calibre.gui2.dialogs.choose_format_ui import Ui_ChooseFormatDialog
@@ -12,6 +12,7 @@ class ChooseFormatDialog(QDialog, Ui_ChooseFormatDialog):
         QDialog.__init__(self, window)
         Ui_ChooseFormatDialog.__init__(self)
         self.setupUi(self)
+        self.connect(self.formats, SIGNAL('activated(QModelIndex)'), lambda i: self.accept())
         
         self.msg.setText(msg)
         for format in formats:

src/calibre/gui2/dialogs/config.py

@@ -126,6 +126,7 @@ class ConfigDialog(QDialog, Ui_Dialog):
                      lambda s: self.password.setEchoMode(self.password.Normal if s == Qt.Checked else self.password.Password))
         self.password.setEchoMode(self.password.Password)
         opts = server_config().parse()
+        self.max_cover_size.setText(opts.max_cover)
         self.port.setValue(opts.port)
         self.username.setText(opts.username)
         self.password.setText(opts.password if opts.password else '')
@@ -221,6 +222,10 @@ class ConfigDialog(QDialog, Ui_Dialog):
             self.directory_list.takeItem(idx)
 
     def accept(self):
+        mcs = unicode(self.max_cover_size.text()).strip()
+        if not re.match(r'\d+x\d+', mcs):
+            error_dialog(self, _('Invalid size'), _('The size %s is invalid. must be of the form widthxheight')%mcs).exec_()
+            return
         config['use_roman_numerals_for_series_number'] = bool(self.roman_numerals.isChecked())
         config['new_version_notification'] = bool(self.new_version_notification.isChecked())
         prefs['network_timeout'] = int(self.timeout.value())
@@ -246,6 +251,7 @@ class ConfigDialog(QDialog, Ui_Dialog):
         sc.set('username', unicode(self.username.text()).strip())
         sc.set('password', unicode(self.password.text()).strip())
         sc.set('port', self.port.value())
+        sc.set('max_cover', mcs)
         config['delete_news_from_library_on_upload'] = self.delete_news.isChecked()
         config['upload_news_to_device'] = self.sync_news.isChecked()
         of = str(self.output_format.currentText())

src/calibre/gui2/dialogs/config.ui

@@ -675,13 +675,33 @@
              </property>
             </widget>
            </item>
-           <item row="3" column="1" >
+           <item row="4" column="1" >
             <widget class="QCheckBox" name="show_server_password" >
              <property name="text" >
               <string>&amp;Show password</string>
              </property>
             </widget>
            </item>
+           <item row="3" column="1" >
+            <widget class="QLineEdit" name="max_cover_size" >
+             <property name="toolTip" >
+              <string>The maximum size (widthxheight) for displayed covers. Larger covers are resized. </string>
+             </property>
+             <property name="text" >
+              <string/>
+             </property>
+            </widget>
+           </item>
+           <item row="3" column="0" >
+            <widget class="QLabel" name="label_3" >
+             <property name="text" >
+              <string>Max. &amp;cover size:</string>
+             </property>
+             <property name="buddy" >
+              <cstring>max_cover_size</cstring>
+             </property>
+            </widget>
+           </item>
           </layout>
          </item>
          <item>

src/calibre/library/__init__.py

@@ -28,4 +28,6 @@ def server_config(defaults=None):
               help=_('Username for access. By default, it is: %default'))
     c.add_opt('develop', ['--develop'], default=False,
               help='Development mode. Server automatically restarts on file changes and serves code files (html, css, js) from the file system instead of calibre\'s resource system.')
+    c.add_opt('max_cover', ['--max-cover'], default='600x800', 
+              help=_('The maximum size for displayed covers'))
     return c

src/calibre/library/server.py

@@ -14,7 +14,7 @@ from datetime import datetime
 from threading import Thread
 
 import cherrypy
-from PIL import Image
+from PyQt4.Qt import QImage, QApplication, QByteArray, Qt, QBuffer
 
 from calibre.constants import __version__, __appname__
 from calibre.utils.genshi.template import MarkupTemplate
@@ -112,6 +112,8 @@ class LibraryServer(object):
             item
             break
         self.opts = opts
+        self.max_cover_width, self.max_cover_height = \
+                        map(int, self.opts.max_cover.split('x'))
         
         cherrypy.config.update({
                                 'log.screen'             : opts.develop,
@@ -179,27 +181,37 @@ class LibraryServer(object):
         cherrypy.engine.exit()
     
     def get_cover(self, id, thumbnail=False):
-        cover = self.db.cover(id, index_is_id=True, as_file=True)
+        cover = self.db.cover(id, index_is_id=True, as_file=False)
         if cover is None:
-            cover = cStringIO.StringIO(server_resources['default_cover.jpg'])
+            cover = server_resources['default_cover.jpg']
         cherrypy.response.headers['Content-Type'] = 'image/jpeg'
         path = getattr(cover, 'name', False)
         updated = datetime.utcfromtimestamp(os.stat(path).st_mtime) if path and os.access(path, os.R_OK) else build_time
         cherrypy.response.headers['Last-Modified'] = self.last_modified(updated)
-        if not thumbnail:
-            return cover.read()
         try:
-            im = Image.open(cover)
-            width, height = im.size
-            scaled, width, height = fit_image(width, height, 80, 60)
+            if QApplication.instance() is None:
+                QApplication([])
+            
+            im = QImage()
+            im.loadFromData(cover)
+            if im.isNull():
+                raise cherrypy.HTTPError(404, 'No valid cover found')
+            width, height = im.width(), im.height()
+            scaled, width, height = fit_image(width, height, 
+                60 if thumbnail else self.max_cover_width, 
+                80 if thumbnail else self.max_cover_height)
             if not scaled:
-                return cover.read()
-            im.thumbnail((width, height))
-            o = cStringIO.StringIO()
-            im.save(o, 'JPEG')
-            return o.getvalue()
+                return cover
+            im = im.scaled(width, height, Qt.KeepAspectRatio, Qt.SmoothTransformation)
+            ba = QByteArray()
+            buf = QBuffer(ba)
+            buf.open(QBuffer.WriteOnly)
+            im.save(buf, 'PNG')
+            return str(ba.data())
         except Exception, err:
-            raise cherrypy.HTTPError(404, 'failed to generate thumbnail: %s'%err)
+            import traceback
+            traceback.print_exc()
+            raise cherrypy.HTTPError(404, 'Failed to generate cover: %s'%err)
         
     def get_format(self, id, format):
         format = format.upper()