Use correct 3:4 aspect ratio for default cover image

src/calibre/gui2/__init__.py

@@ -248,7 +248,7 @@ def info_dialog(parent, title, msg, det_msg='', show=False):
 
 class Dispatcher(QObject):
     '''Convenience class to ensure that a function call always happens in the
-    thread the reciver was created in.'''
+    thread the receiver was created in.'''
     dispatch_signal = pyqtSignal(object, object)
 
     def __init__(self, func):
@@ -507,7 +507,7 @@ def pixmap_to_data(pixmap, format='JPEG'):
     buf = QBuffer(ba)
     buf.open(QBuffer.WriteOnly)
     pixmap.save(buf, format)
-    return str(ba.data())
+    return bytes(ba.data())
 
 class ResizableDialog(QDialog):
 

src/calibre/gui2/dialogs/metadata_single.py

@@ -90,7 +90,7 @@ class MetadataSingleDialog(ResizableDialog, Ui_MetadataSingleDialog):
     COVER_FETCH_TIMEOUT = 240 # seconds
 
     def do_reset_cover(self, *args):
-        pix = QPixmap(I('book.svg'))
+        pix = QPixmap(I('default_cover.svg'))
         self.cover.setPixmap(pix)
         self.cover_changed = True
         self.cover_data = None
@@ -408,7 +408,7 @@ def __init__(self, window, row, db, accepted_callback=None, cancel_all=False):
         if cover:
             pm.loadFromData(cover)
         if pm.isNull():
-            pm = QPixmap(I('book.svg'))
+            pm = QPixmap(I('default_cover.svg'))
         else:
             self.cover_data = cover
         self.cover.setPixmap(pm)

src/calibre/gui2/library/models.py

@@ -43,6 +43,14 @@ def __new__(cls, path, orig_file_path):
         ans.deleted_after_upload = False
         return ans
 
+_default_image = None
+
+def default_image():
+    global _default_image
+    if _default_image is None:
+        _default_image = QImage(I('default_cover.svg'))
+    return _default_image
+
 class BooksModel(QAbstractTableModel): # {{{
 
     about_to_be_sorted   = pyqtSignal(object, name='aboutToBeSorted')
@@ -71,7 +79,7 @@ def __init__(self, parent=None, buffer=40):
         self.book_on_device = None
         self.editable_cols = ['title', 'authors', 'rating', 'publisher',
                               'tags', 'series', 'timestamp', 'pubdate']
-        self.default_image = QImage(I('book.svg'))
+        self.default_image = default_image()
         self.sorted_on = DEFAULT_SORT
         self.sort_history = [self.sorted_on]
         self.last_search = '' # The last search performed on this model

src/calibre/linux.py

@@ -539,17 +539,20 @@ def opts_and_exts(name, op, exts):
 </mime-info>
 '''
 
-def render_svg(image, dest):
+def render_svg(image, dest, width=128, height=128):
     from PyQt4.QtGui import QPainter, QImage
     from PyQt4.QtSvg import QSvgRenderer
-    svg = QSvgRenderer(image.readAll())
+    image = image.readAll() if hasattr(image, 'readAll') else image
+    svg = QSvgRenderer(image)
     painter = QPainter()
-    image = QImage(128,128,QImage.Format_ARGB32_Premultiplied)
+    image = QImage(width, height, QImage.Format_ARGB32)
     painter.begin(image)
     painter.setRenderHints(QPainter.Antialiasing|QPainter.TextAntialiasing|QPainter.SmoothPixmapTransform|QPainter.HighQualityAntialiasing)
     painter.setCompositionMode(QPainter.CompositionMode_SourceOver)
     svg.render(painter)
     painter.end()
+    if dest is None:
+        return image
     image.save(dest)
 
 def main():