Implement image color inversion

lector/__main__.py

@@ -203,10 +203,13 @@ class MainUI(QtWidgets.QMainWindow, mainwindow.Ui_MainWindow):
 
         self.bookToolBar.doublePageButton.triggered.connect(self.change_page_view)
         self.bookToolBar.mangaModeButton.triggered.connect(self.change_page_view)
+        self.bookToolBar.invertButton.triggered.connect(self.change_page_view)
         if self.settings['double_page_mode']:
             self.bookToolBar.doublePageButton.setChecked(True)
         if self.settings['manga_mode']:
             self.bookToolBar.mangaModeButton.setChecked(True)
+        if self.settings['invert_colors']:
+            self.bookToolBar.invertButton.setChecked(True)
 
         for count, i in enumerate(self.display_profiles):
             self.bookToolBar.profileBox.setItemData(count, i, QtCore.Qt.UserRole)
@@ -765,7 +768,9 @@ class MainUI(QtWidgets.QMainWindow, mainwindow.Ui_MainWindow):
     def change_page_view(self, key_pressed=False):
         # Set zoom mode to best fit to
         # make the transition less jarring
-        self.comic_profile['zoom_mode'] = 'bestFit'
+        # if the sender isn't the invert colors button
+        if self.sender() != self.bookToolBar.invertButton:
+            self.comic_profile['zoom_mode'] = 'bestFit'
 
         # Toggle Double page mode / manga mode on keypress
         if key_pressed == QtCore.Qt.Key_D:
@@ -779,6 +784,7 @@ class MainUI(QtWidgets.QMainWindow, mainwindow.Ui_MainWindow):
         # current state of each of the toolbar buttons
         self.settings['double_page_mode'] = self.bookToolBar.doublePageButton.isChecked()
         self.settings['manga_mode'] = self.bookToolBar.mangaModeButton.isChecked()
+        self.settings['invert_colors'] = self.bookToolBar.invertButton.isChecked()
 
         # Switch page to whatever index is selected in the tocBox
         current_tab = self.tabWidget.currentWidget()

lector/contentwidgets.py

@@ -175,6 +175,14 @@ class PliantQGraphicsView(QtWidgets.QGraphicsView):
         else:
             return_pixmap = load_page(current_page)
 
+        if self.main_window.settings['invert_colors']:
+            qImg = return_pixmap.toImage()
+            qImg.invertPixels()
+            if qImg:  # Will return None if conversion doesn't work
+                return_pixmap = QtGui.QPixmap().fromImage(qImg)
+            else:
+                logger.error('Color inversion failed: ' + current_page)
+
         self.image_pixmap = return_pixmap
         self.resizeEvent()
 

lector/definitionsdialog.py

@@ -89,6 +89,7 @@ class DefinitionsUI(QtWidgets.QDialog, definitions.Ui_Dialog):
         except Exception as e:
             this_error = f'API access error'
             logger.exception(this_error + f' {type(e).__name__} Arguments: {e.args}')
+            self.parent.display_error_notification(None)
             return None
 
     def find_definition(self, word):

lector/resources/raw/DarkIcons/invert.svg

@@ -0,0 +1,8 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 22 22">
+ <defs>
+  <style id="current-color-scheme" type="text/css">
+   .ColorScheme-Text { color:#444444; } .ColorScheme-Highlight { color:#5294e2; }
+  </style>
+ </defs>
+ <path style="fill:currentColor" class="ColorScheme-Text" d="M 2 1 L 2 15 L 9 15 L 9 13 A 5 5 0 0 1 4 8 A 5 5 0 0 1 9 3 L 9 1 L 2 1 z M 9 3 L 9 13 C 11.7614 13 14 10.7614 14 8 C 14 5.2386 11.7614 3 9 3 z" transform="translate(3 3)"/>
+</svg>

lector/resources/raw/LightIcons/invert.svg

@@ -0,0 +1,8 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 22 22">
+ <defs>
+  <style id="current-color-scheme" type="text/css">
+   .ColorScheme-Text { color:#dfdfdf; } .ColorScheme-Highlight { color:#5294e2; }
+  </style>
+ </defs>
+ <path style="fill:currentColor" class="ColorScheme-Text" d="M 2 1 L 2 15 L 9 15 L 9 13 A 5 5 0 0 1 4 8 A 5 5 0 0 1 9 3 L 9 1 L 2 1 z M 9 3 L 9 13 C 11.7614 13 14 10.7614 14 8 C 14 5.2386 11.7614 3 9 3 z" transform="translate(3 3)"/>
+</svg>

lector/resources/raw/resources.qrc

@@ -1,5 +1,7 @@
 <RCC>
   <qresource prefix="images">
+    <file>DarkIcons/invert.svg</file>
+    <file>LightIcons/invert.svg</file>
     <file>DarkIcons/manga-mode.svg</file>
     <file>LightIcons/manga-mode.svg</file>
     <file>DarkIcons/search-word.svg</file>

lector/settings.py

@@ -134,6 +134,8 @@ class Settings:
             'doublePageMode', 'False').capitalize())
         self.parent.settings['manga_mode'] = literal_eval(self.settings.value(
             'mangaMode', 'False').capitalize())
+        self.parent.settings['invert_colors'] = literal_eval(self.settings.value(
+            'invertColors', 'False').capitalize())
         self.settings.endGroup()
 
         self.settings.beginGroup('dialogSettings')
@@ -216,8 +218,9 @@ class Settings:
         self.settings.setValue('autoCover', str(current_settings['auto_cover']))
         self.settings.setValue('scrollSpeed', current_settings['scroll_speed'])
         self.settings.setValue('considerReadAt', current_settings['consider_read_at'])
-        self.settings.setValue('mangaMode', str(current_settings['manga_mode']))
         self.settings.setValue('doublePageMode', str(current_settings['double_page_mode']))
+        self.settings.setValue('mangaMode', str(current_settings['manga_mode']))
+        self.settings.setValue('invertColors', str(current_settings['invert_colors']))
         self.settings.setValue('smallIncrement', current_settings['small_increment'])
         self.settings.setValue('largeIncrement', current_settings['large_increment'])
         self.settings.endGroup()

lector/toolbars.py

@@ -227,6 +227,13 @@ class BookToolBar(QtWidgets.QToolBar):
         self.mangaModeButton.setObjectName('mangaModeButton')
         self.mangaModeButton.setCheckable(True)
 
+        self.invertButton = QtWidgets.QAction(
+            image_factory.get_image('invert'),
+            self._translate('BookToolBar', 'Invert page colors'),
+            self)
+        self.invertButton.setObjectName('mangaModeButton')
+        self.invertButton.setCheckable(True)
+
         self.zoomIn = QtWidgets.QAction(
             image_factory.get_image('zoom-in'),
             self._translate('BookToolBar', 'Zoom in (+)'),
@@ -264,6 +271,7 @@ class BookToolBar(QtWidgets.QToolBar):
         self.comicSeparator1 = self.addSeparator()
         self.addAction(self.doublePageButton)
         self.addAction(self.mangaModeButton)
+        self.addAction(self.invertButton)
         self.comicSeparator2 = self.addSeparator()
         self.addAction(self.zoomIn)
         self.addAction(self.zoomOut)
@@ -276,6 +284,7 @@ class BookToolBar(QtWidgets.QToolBar):
         self.comicActions = [
             self.doublePageButton,
             self.mangaModeButton,
+            self.invertButton,
             self.comicBGColorAction,
             self.zoomIn,
             self.zoomOut,