Allow disabling anti-aliasing via a setting (#241)

## Summary

Fixes https://github.com/daveallie/crosspoint-reader/issues/233

## Additional Context

By disabling the Text Anti-Aliasing in the settings, you can get faster
black-and-white page turns that work exactly like the stock firmware,
instead of having an additional flash after rendering (see issue linked
above for example).

Tested on the X4 and confirmed working.

---------

Co-authored-by: Dave Allie <dave@daveallie.com>

src/CrossPointSettings.cpp

@@ -14,7 +14,7 @@ CrossPointSettings CrossPointSettings::instance;
 namespace {
 constexpr uint8_t SETTINGS_FILE_VERSION = 1;
 // Increment this when adding new persisted settings fields
-constexpr uint8_t SETTINGS_COUNT = 16;
+constexpr uint8_t SETTINGS_COUNT = 17;
 constexpr char SETTINGS_FILE[] = "/.crosspoint/settings.bin";
 }  // namespace
 
@@ -45,6 +45,7 @@ bool CrossPointSettings::saveToFile() const {
   serialization::writePod(outputFile, screenMargin);
   serialization::writePod(outputFile, sleepScreenCoverMode);
   serialization::writeString(outputFile, std::string(opdsServerUrl));
+  serialization::writePod(outputFile, textAntiAliasing);
   outputFile.close();
 
   Serial.printf("[%lu] [CPS] Settings saved to file\n", millis());
@@ -107,6 +108,8 @@ bool CrossPointSettings::loadFromFile() {
       strncpy(opdsServerUrl, urlStr.c_str(), sizeof(opdsServerUrl) - 1);
       opdsServerUrl[sizeof(opdsServerUrl) - 1] = '\0';
     }
+    serialization::readPod(inputFile, textAntiAliasing);
+    if (++settingsRead >= fileSettingsCount) break;
   } while (false);
 
   inputFile.close();

src/CrossPointSettings.h

@@ -60,6 +60,7 @@ class CrossPointSettings {
   uint8_t statusBar = FULL;
   // Text rendering settings
   uint8_t extraParagraphSpacing = 1;
+  uint8_t textAntiAliasing = 1;
   // Duration of the power button press
   uint8_t shortPwrBtn = 0;
   // EPUB reading orientation settings

src/activities/reader/EpubReaderActivity.cpp

@@ -388,7 +388,7 @@ void EpubReaderActivity::renderContents(std::unique_ptr<Page> page, const int or
 
   // grayscale rendering
   // TODO: Only do this if font supports it
-  {
+  if (SETTINGS.textAntiAliasing) {
     renderer.clearScreen(0x00);
     renderer.setRenderMode(GfxRenderer::GRAYSCALE_LSB);
     page->render(renderer, SETTINGS.getReaderFontId(), orientedMarginLeft, orientedMarginTop);

src/activities/settings/SettingsActivity.cpp

@@ -13,13 +13,14 @@
 
 // Define the static settings list
 namespace {
-constexpr int settingsCount = 17;
+constexpr int settingsCount = 18;
 const SettingInfo settingsList[settingsCount] = {
     // Should match with SLEEP_SCREEN_MODE
     SettingInfo::Enum("Sleep Screen", &CrossPointSettings::sleepScreen, {"Dark", "Light", "Custom", "Cover", "None"}),
     SettingInfo::Enum("Sleep Screen Cover Mode", &CrossPointSettings::sleepScreenCoverMode, {"Fit", "Crop"}),
     SettingInfo::Enum("Status Bar", &CrossPointSettings::statusBar, {"None", "No Progress", "Full"}),
     SettingInfo::Toggle("Extra Paragraph Spacing", &CrossPointSettings::extraParagraphSpacing),
+    SettingInfo::Toggle("Text Anti-Aliasing", &CrossPointSettings::textAntiAliasing),
     SettingInfo::Toggle("Short Power Button Click", &CrossPointSettings::shortPwrBtn),
     SettingInfo::Enum("Reading Orientation", &CrossPointSettings::orientation,
                       {"Portrait", "Landscape CW", "Inverted", "Landscape CCW"}),