Add a trim cover option ot the bulk metadata edit dialog

Merge branch 'Bulk-trim-covers' of git://github.com/sengian/calibre

resources/default_tweaks.py

@@ -385,6 +385,12 @@ sort_dates_using_visible_fields = False
 generate_cover_title_font = None
 generate_cover_foot_font = None
 
+#: Fuzz value for trimming covers
+# The value used for the fuzz distance when trimming a cover.
+# Colors within this distance are considered equal.
+# The distance is in absolute intensity units.
+cover_trim_fuzz_value = 10
+
 #: Control behavior of the book list
 # You can control the behavior of doubleclicks on the books list.
 # Choices: open_viewer, do_nothing,

src/calibre/gui2/dialogs/metadata_bulk.py

@@ -204,6 +204,16 @@ class MyBlockingBusyNew(QDialog):  # {{{
                     covers.sort(key=lambda x: x[1])
                     if covers:
                         cache.set_cover({book_id:covers[-1][0]})
+        elif args.cover_action == 'trim':
+            from calibre.utils.magick import Image
+            for book_id in self.ids:
+                cdata = cache.cover(book_id)
+                if cdata:
+                    im = Image()
+                    im.load(cdata)
+                    im.trim(tweaks['cover_trim_fuzz_value'])
+                    cdata = im.export('jpg')
+                    cache.set_cover({book_id:cdata})
 
         # Formats
         if args.do_remove_format:
@@ -423,6 +433,15 @@ class MyBlockingBusy(QDialog):  # {{{
                     if covers:
                         self.db.set_cover(id, covers[-1][0])
                     covers = []
+            elif cover_action == 'trim':
+                from calibre.utils.magick import Image
+                cdata = self.db.cover(id, index_is_id=True)
+                if cdata:
+                    im = Image()
+                    im.load(cdata)
+                    im.trim(tweaks['cover_trim_fuzz_value'])
+                    cdata = im.export('jpg')
+                    self.db.set_cover(id, cdata)
 
             if do_remove_format:
                 self.db.remove_format(id, remove_format, index_is_id=True,
@@ -1213,6 +1232,8 @@ class MetadataBulkDialog(ResizableDialog, Ui_MetadataBulkDialog):
             cover_action = 'generate'
         elif self.cover_from_fmt.isChecked():
             cover_action = 'fromfmt'
+        elif self.cover_trim.isChecked():
+            cover_action = 'trim'
 
         args = Settings(remove_all, remove, add, au, aus, do_aus, rating, pub, do_series,
                 do_autonumber, do_remove_format, remove_format, do_swap_ta,

src/calibre/gui2/dialogs/metadata_bulk.ui

@@ -603,6 +603,13 @@ Future conversion of these books will use the default settings.</string>
                 </property>
                </widget>
               </item>
+              <item>
+               <widget class="QRadioButton" name="cover_trim">
+                <property name="text">
+                 <string>&amp;Trim cover</string>
+                </property>
+               </widget>
+              </item>
               <item>
                <widget class="QRadioButton" name="cover_from_fmt">
                 <property name="text">

src/calibre/gui2/metadata/basic_widgets.py

@@ -971,7 +971,7 @@ class Cover(ImageView):  # {{{
             return
         im = Image()
         im.load(cdata)
-        im.trim(10)
+        im.trim(tweaks['cover_trim_fuzz_value'])
         cdata = im.export('png')
         self.current_val = cdata