Fix problems with missing safety checks in Render::fillBuffer and pdfcomic

YACReaderLibrary/qml/InfoFavorites.qml

@@ -0,0 +1,32 @@
+import QtQuick 2.6
+
+import QtGraphicalEffects 1.0
+
+Item {
+    width: 20
+    height: 20
+
+    property bool active
+
+    signal activeChangedByUser(bool active)
+
+    MouseArea {
+        anchors.fill: favorites_button_compact
+        onClicked: {
+            activeChangedByUser(!active);
+        }
+    }
+
+    Image {
+        anchors.centerIn: parent
+        id: favorites_button_compact
+        source: "info-favorites.png"
+    }
+
+    ColorOverlay {
+        anchors.fill: favorites_button_compact
+        source: favorites_button_compact
+        color: active ? favCheckedColor : favUncheckedColor
+    }
+}
+