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feat(rlcd): runtime font size selector in Settings->Display

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- device.properties bump default to 20
- lvgl_fonts add runtime override API (g_runtime_font_size + externs for all Montserrat sizes)
- DisplaySettings add fontSize field persisted in properties
- Display app adds Font size dropdown 14-28 applying immediately
- Lvgl.cpp applies saved runtime font on boot
- device.py new bucket <=20 includes all fonts for runtime switching (~150KB)

Co-authored-by: internal-model
This commit is contained in:
Adolfo Reyna
2026-07-18 15:10:42 -04:00
parent 12035f2f39
commit e29e9b4a66
8 changed files with 177 additions and 18 deletions
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Tactility/Include/Tactility/settings/DisplaySettings.h
+1
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@@ -26,6 +26,7 @@ struct DisplaySettings {
bool disableScreensaverWhenCharging = false;
bool invertColor = false;
uint8_t monochromeThreshold = 60;
uint8_t fontSize = 0; // 0 = use compile-time default, otherwise 14/16/18/20/24/28
};
lv_display_rotation_t toLvglDisplayRotation(Orientation orientation);
bool load(DisplaySettings& settings);
Tactility/Source/app/display/Display.cpp
+45 -1
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@@ -1,11 +1,11 @@
#include <Tactility/Tactility.h>
#include <tactility/lvgl_icon_shared.h>
#include <tactility/lvgl_fonts.h>
#ifdef ESP_PLATFORM
#include <Tactility/service/displayidle/DisplayIdleService.h>
#endif
#include <Tactility/Logger.h>
#include <Tactility/app/App.h>
#include <Tactility/hal/display/DisplayDevice.h>
@@ -156,6 +156,21 @@ class DisplayApp final : public App {
}
}
static void onFontSizeChanged(lv_event_t* event) {
auto* app = static_cast<DisplayApp*>(lv_event_get_user_data(event));
auto* dropdown = static_cast<lv_obj_t*>(lv_event_get_target(event));
uint32_t idx = lv_dropdown_get_selected(dropdown);
// Map dropdown index to font size: 0=default (compile-time), 1=14, 2=16, 3=18, 4=20, 5=24, 6=28
static const uint8_t font_sizes[] = {0, 14, 16, 18, 20, 24, 28};
if (idx < sizeof(font_sizes)/sizeof(font_sizes[0])) {
uint8_t new_size = font_sizes[idx];
app->displaySettings.fontSize = new_size;
app->displaySettingsUpdated = true;
// Apply immediately for next screens - current screen keeps old fonts until reopen
lvgl_set_runtime_font_size(new_size);
}
}
static void onTimeoutChanged(lv_event_t* event) {
auto* app = static_cast<DisplayApp*>(lv_event_get_user_data(event));
auto* dropdown = static_cast<lv_obj_t*>(lv_event_get_target(event));
@@ -427,6 +442,35 @@ public:
}
}
// Runtime font size selector
{
auto* font_wrapper = lv_obj_create(main_wrapper);
lv_obj_set_size(font_wrapper, LV_PCT(100), LV_SIZE_CONTENT);
lv_obj_set_style_pad_all(font_wrapper, 0, LV_STATE_DEFAULT);
lv_obj_set_style_border_width(font_wrapper, 0, LV_STATE_DEFAULT);
auto* font_label = lv_label_create(font_wrapper);
lv_label_set_text(font_label, "Font size");
lv_obj_align(font_label, LV_ALIGN_LEFT_MID, 0, 0);
auto* font_dropdown = lv_dropdown_create(font_wrapper);
lv_dropdown_set_options(font_dropdown, "Default\n14 Small\n16\n18\n20\n24 Next\n28 Large");
lv_obj_align(font_dropdown, LV_ALIGN_RIGHT_MID, 0, 0);
lv_obj_add_event_cb(font_dropdown, onFontSizeChanged, LV_EVENT_VALUE_CHANGED, this);
// Map current fontSize to dropdown index
uint8_t fs = displaySettings.fontSize;
uint32_t idx = 0;
if (fs == 14) idx = 1;
else if (fs == 16) idx = 2;
else if (fs == 18) idx = 3;
else if (fs == 20) idx = 4;
else if (fs == 24) idx = 5;
else if (fs == 28) idx = 6;
else idx = 0; // 0 = compile-time default (currently 20)
lv_dropdown_set_selected(font_dropdown, idx);
}
if (hasCalibratableTouchDevice()) {
auto* calibrate_wrapper = lv_obj_create(main_wrapper);
lv_obj_set_size(calibrate_wrapper, LV_PCT(100), LV_SIZE_CONTENT);
Tactility/Source/lvgl/Lvgl.cpp
+6
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@@ -11,6 +11,7 @@
#include <Tactility/settings/DisplaySettings.h>
#include <tactility/lvgl_module.h>
#include <tactility/lvgl_fonts.h>
#include <tactility/module.h>
#include <lvgl.h>
@@ -44,6 +45,11 @@ void attachDevices() {
if (rotation != lv_display_get_rotation(lvgl_display)) {
lv_display_set_rotation(lvgl_display, rotation);
}
// Apply runtime font size (0 = compile-time default)
if (settings.fontSize != 0) {
lvgl_set_runtime_font_size(settings.fontSize);
LOGGER.info("Runtime font size set to {}", settings.fontSize);
}
// Apply invert setting if display supports it
if (display->supportsInvertColor()) {
display->setInvertColor(settings.invertColor);
Tactility/Source/settings/DisplaySettings.cpp
+13 -1
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@@ -25,6 +25,7 @@ constexpr auto* SETTINGS_KEY_SCREENSAVER_TYPE = "screensaverType";
constexpr auto* SETTINGS_KEY_DISABLE_WHEN_CHARGING = "disableScreensaverWhenCharging";
constexpr auto* SETTINGS_KEY_INVERT_COLOR = "invertColor";
constexpr auto* SETTINGS_KEY_MONO_THRESHOLD = "monochromeThreshold";
constexpr auto* SETTINGS_KEY_FONT_SIZE = "fontSize";
static Orientation getDefaultOrientation() {
auto* display = lv_display_get_default();
@@ -187,6 +188,14 @@ bool load(DisplaySettings& settings) {
if (mono_thresh > 255) mono_thresh = 255;
}
int font_size = 0;
auto font_entry = map.find(SETTINGS_KEY_FONT_SIZE);
if (font_entry != map.end()) {
font_size = atoi(font_entry->second.c_str());
if (font_size < 0) font_size = 0;
if (font_size > 36) font_size = 36;
}
settings.orientation = orientation;
settings.gammaCurve = gamma_curve;
settings.backlightDuty = backlight_duty;
@@ -196,6 +205,7 @@ bool load(DisplaySettings& settings) {
settings.disableScreensaverWhenCharging = disable_when_charging;
settings.invertColor = invert_color;
settings.monochromeThreshold = static_cast<uint8_t>(mono_thresh);
settings.fontSize = static_cast<uint8_t>(font_size);
return true;
}
@@ -210,7 +220,8 @@ DisplaySettings getDefault() {
.screensaverType = ScreensaverType::BouncingBalls,
.disableScreensaverWhenCharging = false,
.invertColor = true,
.monochromeThreshold = 60
.monochromeThreshold = 60,
.fontSize = 0
};
}
@@ -233,6 +244,7 @@ bool save(const DisplaySettings& settings) {
map[SETTINGS_KEY_DISABLE_WHEN_CHARGING] = settings.disableScreensaverWhenCharging ? "1" : "0";
map[SETTINGS_KEY_INVERT_COLOR] = settings.invertColor ? "1" : "0";
map[SETTINGS_KEY_MONO_THRESHOLD] = std::to_string(settings.monochromeThreshold);
map[SETTINGS_KEY_FONT_SIZE] = std::to_string(settings.fontSize);
auto settings_path = getSettingsFilePath();
if (!file::findOrCreateParentDirectory(settings_path, 0755)) {
return false;