Add setting for line spacing to adjust space between lines (#164)

## Summary

* Add setting for line spacing to adjust space between lines
* Aleo is already a bit tighter than Noto Sans and Open Dyslexic, so
have adjusted the values to match, this can be tweaked in the future

src/CrossPointSettings.cpp

@@ -12,7 +12,7 @@ CrossPointSettings CrossPointSettings::instance;
 namespace {
 constexpr uint8_t SETTINGS_FILE_VERSION = 1;
 // Increment this when adding new persisted settings fields
-constexpr uint8_t SETTINGS_COUNT = 9;
+constexpr uint8_t SETTINGS_COUNT = 10;
 constexpr char SETTINGS_FILE[] = "/.crosspoint/settings.bin";
 }  // namespace
 
@@ -36,6 +36,7 @@ bool CrossPointSettings::saveToFile() const {
   serialization::writePod(outputFile, sideButtonLayout);
   serialization::writePod(outputFile, fontFamily);
   serialization::writePod(outputFile, fontSize);
+  serialization::writePod(outputFile, lineSpacing);
   outputFile.close();
 
   Serial.printf("[%lu] [CPS] Settings saved to file\n", millis());
@@ -80,6 +81,8 @@ bool CrossPointSettings::loadFromFile() {
     if (++settingsRead >= fileSettingsCount) break;
     serialization::readPod(inputFile, fontSize);
     if (++settingsRead >= fileSettingsCount) break;
+    serialization::readPod(inputFile, lineSpacing);
+    if (++settingsRead >= fileSettingsCount) break;
   } while (false);
 
   inputFile.close();
@@ -87,6 +90,42 @@ bool CrossPointSettings::loadFromFile() {
   return true;
 }
 
+float CrossPointSettings::getReaderLineCompression() const {
+  switch (fontFamily) {
+    case ALEO:
+    default:
+      switch (lineSpacing) {
+        case TIGHT:
+          return 0.95f;
+        case NORMAL:
+        default:
+          return 1.0f;
+        case WIDE:
+          return 1.1f;
+      }
+    case NOTOSANS:
+      switch (lineSpacing) {
+        case TIGHT:
+          return 0.90f;
+        case NORMAL:
+        default:
+          return 0.95f;
+        case WIDE:
+          return 1.0f;
+      }
+    case OPENDYSLEXIC:
+      switch (lineSpacing) {
+        case TIGHT:
+          return 0.90f;
+        case NORMAL:
+        default:
+          return 0.95f;
+        case WIDE:
+          return 1.0f;
+      }
+  }
+}
+
 int CrossPointSettings::getReaderFontId() const {
   switch (fontFamily) {
     case ALEO:

src/CrossPointSettings.h

@@ -42,6 +42,7 @@ class CrossPointSettings {
   enum FONT_FAMILY { ALEO = 0, NOTOSANS = 1, OPENDYSLEXIC = 2 };
   // Font size options
   enum FONT_SIZE { SMALL = 0, MEDIUM = 1, LARGE = 2, EXTRA_LARGE = 3 };
+  enum LINE_COMPRESSION { TIGHT = 0, NORMAL = 1, WIDE = 2 };
 
   // Sleep screen settings
   uint8_t sleepScreen = DARK;
@@ -54,14 +55,13 @@ class CrossPointSettings {
   // EPUB reading orientation settings
   // 0 = portrait (default), 1 = landscape clockwise, 2 = inverted, 3 = landscape counter-clockwise
   uint8_t orientation = PORTRAIT;
-  // Front button layout
+  // Button layouts
   uint8_t frontButtonLayout = BACK_CONFIRM_LEFT_RIGHT;
-  // Side button layout
   uint8_t sideButtonLayout = PREV_NEXT;
-  // Font family
+  // Reader font settings
   uint8_t fontFamily = ALEO;
-  // Font size
   uint8_t fontSize = MEDIUM;
+  uint8_t lineSpacing = NORMAL;
 
   ~CrossPointSettings() = default;
 
@@ -73,6 +73,8 @@ class CrossPointSettings {
 
   bool saveToFile() const;
   bool loadFromFile();
+
+  float getReaderLineCompression() const;
 };
 
 // Helper macro to access settings

src/activities/reader/EpubReaderActivity.cpp

@@ -16,7 +16,6 @@ namespace {
 constexpr int pagesPerRefresh = 15;
 constexpr unsigned long skipChapterMs = 700;
 constexpr unsigned long goHomeMs = 1000;
-constexpr float lineCompression = 0.95f;
 constexpr int topPadding = 5;
 constexpr int horizontalPadding = 5;
 constexpr int statusBarMargin = 19;
@@ -257,8 +256,8 @@ void EpubReaderActivity::renderScreen() {
     const auto viewportWidth = renderer.getScreenWidth() - orientedMarginLeft - orientedMarginRight;
     const auto viewportHeight = renderer.getScreenHeight() - orientedMarginTop - orientedMarginBottom;
 
-    if (!section->loadSectionFile(SETTINGS.getReaderFontId(), lineCompression, SETTINGS.extraParagraphSpacing,
-                                  viewportWidth, viewportHeight)) {
+    if (!section->loadSectionFile(SETTINGS.getReaderFontId(), SETTINGS.getReaderLineCompression(),
+                                  SETTINGS.extraParagraphSpacing, viewportWidth, viewportHeight)) {
       Serial.printf("[%lu] [ERS] Cache not found, building...\n", millis());
 
       // Progress bar dimensions
@@ -301,8 +300,9 @@ void EpubReaderActivity::renderScreen() {
         renderer.displayBuffer(EInkDisplay::FAST_REFRESH);
       };
 
-      if (!section->createSectionFile(SETTINGS.getReaderFontId(), lineCompression, SETTINGS.extraParagraphSpacing,
-                                      viewportWidth, viewportHeight, progressSetup, progressCallback)) {
+      if (!section->createSectionFile(SETTINGS.getReaderFontId(), SETTINGS.getReaderLineCompression(),
+                                      SETTINGS.extraParagraphSpacing, viewportWidth, viewportHeight, progressSetup,
+                                      progressCallback)) {
         Serial.printf("[%lu] [ERS] Failed to persist page data to SD\n", millis());
         section.reset();
         return;

src/activities/settings/SettingsActivity.cpp

@@ -9,7 +9,7 @@
 
 // Define the static settings list
 namespace {
-constexpr int settingsCount = 10;
+constexpr int settingsCount = 11;
 const SettingInfo settingsList[settingsCount] = {
     // Should match with SLEEP_SCREEN_MODE
     {"Sleep Screen", SettingType::ENUM, &CrossPointSettings::sleepScreen, {"Dark", "Light", "Custom", "Cover"}},
@@ -30,6 +30,7 @@ const SettingInfo settingsList[settingsCount] = {
      {"Prev, Next", "Next, Prev"}},
     {"Reader Font Family", SettingType::ENUM, &CrossPointSettings::fontFamily, {"Aleo", "Noto Sans", "Open Dyslexic"}},
     {"Reader Font Size", SettingType::ENUM, &CrossPointSettings::fontSize, {"Small", "Medium", "Large", "X Large"}},
+    {"Reader Line Spacing", SettingType::ENUM, &CrossPointSettings::lineSpacing, {"Tight", "Normal", "Wide"}},
     {"Check for updates", SettingType::ACTION, nullptr, {}},
 };
 }  // namespace