Added Font Hinting toggle (#3182)

frontend/apps/reader/modules/readerfont.lua

@@ -116,6 +116,10 @@ function ReaderFont:onReadSettings(config)
             or G_reader_settings:readSetting("copt_font_weight") or 0
     self.ui.document:toggleFontBolder(self.font_embolden)
 
+    self.font_hinting = config:readSetting("font_hinting")
+            or G_reader_settings:readSetting("copt_font_hinting") or 2 -- default in cre.cpp
+    self.ui.document:setFontHinting(self.font_hinting)
+
     self.line_space_percent = config:readSetting("line_space_percent")
             or G_reader_settings:readSetting("copt_line_spacing")
             or DCREREADER_CONFIG_LINE_SPACE_PERCENT_MEDIUM
@@ -206,6 +210,13 @@ function ReaderFont:onToggleFontBolder(toggle)
     return true
 end
 
+function ReaderFont:onSetFontHinting(mode)
+    self.font_hinting = mode
+    self.ui.document:setFontHinting(mode)
+    self.ui:handleEvent(Event:new("UpdatePos"))
+    return true
+end
+
 function ReaderFont:onSetFontGamma(gamma)
     self.gamma_index = gamma
     UIManager:show(Notification:new{
@@ -222,6 +233,7 @@ function ReaderFont:onSaveSettings()
     self.ui.doc_settings:saveSetting("header_font_face", self.header_font_face)
     self.ui.doc_settings:saveSetting("font_size", self.font_size)
     self.ui.doc_settings:saveSetting("font_embolden", self.font_embolden)
+    self.ui.doc_settings:saveSetting("font_hinting", self.font_hinting)
     self.ui.doc_settings:saveSetting("line_space_percent", self.line_space_percent)
     self.ui.doc_settings:saveSetting("gamma_index", self.gamma_index)
 end

frontend/document/credocument.lua

@@ -424,6 +424,11 @@ function CreDocument:setGammaIndex(index)
     cre.setGammaIndex(index)
 end
 
+function CreDocument:setFontHinting(mode)
+    logger.dbg("CreDocument: set font hinting mode", mode)
+    self._document:setIntProperty("font.hinting.mode", mode)
+end
+
 function CreDocument:setStyleSheet(new_css)
     logger.dbg("CreDocument: set style sheet", new_css)
     self._document:setStyleSheet(new_css)

frontend/ui/data/creoptions.lua

@@ -136,6 +136,15 @@ local CreOptions = {
                     DCREREADER_CONFIG_DEFAULT_FONT_GAMMA,
                     DCREREADER_CONFIG_DARKER_FONT_GAMMA,
                 },
+            },
+            {
+                name = "font_hinting",
+                name_text = S.FONT_HINT,
+                toggle = {S.OFF, S.NATIVE, S.AUTO},
+                values = {0, 1, 2},
+                default_value = 2,
+                args = {0, 1, 2},
+                event = "SetFontHinting",
             }
         }
     },

frontend/ui/data/strings.lua

@@ -23,6 +23,7 @@ S.AUTO_STRAIGHTEN = _("Auto Straighten")
 S.INDENTATION = _("Indentation")
 S.FONT_WEIGHT = _("Font Weight")
 S.GAMMA = _("Gamma")
+S.FONT_HINT = _("Font Hinting")
 S.VIEW_MODE = _("View Mode")
 S.EMBEDDED_STYLE = _("Embedded Style")
 S.EMBEDDED_FONTS = _("Embedded Fonts")
@@ -46,6 +47,7 @@ S.LIGHTER = _("lighter")
 S.DEFAULT = _("default")
 S.DARKER = _("darker")
 S.DARKEST = _("darkest")
+S.NATIVE = _("native")
 S.LOW = _("low")
 S.HIGH = _("high")
 S.ZERO_DEG = _("0 deg")