Add cover filter option

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 = 20;
+constexpr uint8_t SETTINGS_COUNT = 21;
 constexpr char SETTINGS_FILE[] = "/.crosspoint/settings.bin";
 }  // namespace
 
@@ -49,6 +49,7 @@ bool CrossPointSettings::saveToFile() const {
   serialization::writePod(outputFile, hideBatteryPercentage);
   serialization::writePod(outputFile, longPressChapterSkip);
   serialization::writePod(outputFile, hyphenationEnabled);
+  serialization::writePod(outputFile, sleepScreenCoverFilter);
   outputFile.close();
 
   Serial.printf("[%lu] [CPS] Settings saved to file\n", millis());
@@ -120,6 +121,8 @@ bool CrossPointSettings::loadFromFile() {
     if (++settingsRead >= fileSettingsCount) break;
     serialization::readPod(inputFile, hyphenationEnabled);
     if (++settingsRead >= fileSettingsCount) break;
+    serialization::readPod(inputFile, sleepScreenCoverFilter);
+    if (++settingsRead >= fileSettingsCount) break;
   } while (false);
 
   inputFile.close();

src/CrossPointSettings.h

@@ -18,6 +18,7 @@ class CrossPointSettings {
   // Should match with SettingsActivity text
   enum SLEEP_SCREEN_MODE { DARK = 0, LIGHT = 1, CUSTOM = 2, COVER = 3, BLANK = 4 };
   enum SLEEP_SCREEN_COVER_MODE { FIT = 0, CROP = 1 };
+  enum SLEEP_SCREEN_COVER_FILTER { NO_FILTER = 0, INVERTED = 1, BLACK_AND_WHITE = 2, INVERTED_BLACK_AND_WHITE = 3 };
 
   // Status bar display type enum
   enum STATUS_BAR_MODE { NONE = 0, NO_PROGRESS = 1, FULL = 2 };
@@ -62,6 +63,8 @@ class CrossPointSettings {
   uint8_t sleepScreen = DARK;
   // Sleep screen cover mode settings
   uint8_t sleepScreenCoverMode = FIT;
+  // Sleep screen cover filter
+  uint8_t sleepScreenCoverFilter = NO_FILTER;
   // Status bar settings
   uint8_t statusBar = FULL;
   // Text rendering settings

src/activities/boot_sleep/SleepActivity.cpp

@@ -179,10 +179,23 @@ void SleepActivity::renderBitmapSleepScreen(const Bitmap& bitmap) const {
 
   Serial.printf("[%lu] [SLP] drawing to %d x %d\n", millis(), x, y);
   renderer.clearScreen();
+
+  const bool hasGreyscale =
+      bitmap.hasGreyscale() &&
+      SETTINGS.sleepScreenCoverFilter != CrossPointSettings::SLEEP_SCREEN_COVER_FILTER::BLACK_AND_WHITE &&
+      SETTINGS.sleepScreenCoverFilter != CrossPointSettings::SLEEP_SCREEN_COVER_FILTER::INVERTED_BLACK_AND_WHITE;
+
   renderer.drawBitmap(bitmap, x, y, pageWidth, pageHeight, cropX, cropY);
+
+  if (SETTINGS.sleepScreenCoverFilter == CrossPointSettings::SLEEP_SCREEN_COVER_FILTER::INVERTED ||
+      SETTINGS.sleepScreenCoverFilter ==
+          CrossPointSettings::SLEEP_SCREEN_COVER_FILTER::INVERTED_BLACK_AND_WHITE) {
+    renderer.invertScreen();
+  }
+
   renderer.displayBuffer(EInkDisplay::HALF_REFRESH);
 
-  if (bitmap.hasGreyscale()) {
+  if (hasGreyscale) {
     bitmap.rewindToData();
     renderer.clearScreen(0x00);
     renderer.setRenderMode(GfxRenderer::GRAYSCALE_LSB);
@@ -195,6 +208,10 @@ void SleepActivity::renderBitmapSleepScreen(const Bitmap& bitmap) const {
     renderer.drawBitmap(bitmap, x, y, pageWidth, pageHeight, cropX, cropY);
     renderer.copyGrayscaleMsbBuffers();
 
+    if (SETTINGS.sleepScreenCoverFilter == CrossPointSettings::SLEEP_SCREEN_COVER_FILTER::INVERTED) {
+      renderer.grayscaleRevert();
+    }
+
     renderer.displayGrayBuffer();
     renderer.setRenderMode(GfxRenderer::BW);
   }

src/activities/settings/SettingsActivity.cpp

@@ -11,11 +11,12 @@
 const char* SettingsActivity::categoryNames[categoryCount] = {"Display", "Reader", "Controls", "System"};
 
 namespace {
-constexpr int displaySettingsCount = 5;
+constexpr int displaySettingsCount = 6;
 const SettingInfo displaySettings[displaySettingsCount] = {
     // 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("Sleep Screen Cover Filter", &CrossPointSettings::sleepScreenCoverFilter, {"No filter", "Inverted", "B&W", "Inverted B&W"}),
     SettingInfo::Enum("Status Bar", &CrossPointSettings::statusBar, {"None", "No Progress", "Full"}),
     SettingInfo::Enum("Hide Battery %", &CrossPointSettings::hideBatteryPercentage, {"Never", "In Reader", "Always"}),
     SettingInfo::Enum("Refresh Frequency", &CrossPointSettings::refreshFrequency,