UI and bug fixes (#3164)

* Fix BLE RX RSSI and Channel scale

* Properly reset gradient index 0

* Use move constructor in MenuView::add_item

* Avoid erasing during iteration

* Fix gradient rounding. Extend to end of table

* Add comment to add_item

firmware/application/apps/ble_rx_app.hpp

@@ -322,10 +322,10 @@ class BLERxView : public View {
         {UI_POS_X(21), UI_POS_Y(0)}};
 
     RSSI rssi{
-        {UI_POS_X(24), 0, UI_POS_WIDTH_REMAINING(6), 4}};
+        {UI_POS_X(24), 0, UI_POS_WIDTH_REMAINING(24), 4}};
 
     Channel channel{
-        {UI_POS_X(24), 5, UI_POS_WIDTH_REMAINING(6), 4}};
+        {UI_POS_X(24), 5, UI_POS_WIDTH_REMAINING(24), 4}};
 
     Labels label_sort{
         {{UI_POS_X(0), UI_POS_Y(1)}, "Sort:", Theme::getInstance()->fg_light->foreground}};

firmware/application/external/waterfall_designer/ui_waterfall_designer.cpp

@@ -193,15 +193,12 @@ void WaterfallDesignerView::on_profile_changed(std::filesystem::path new_profile
     auto reader = FileLineReader(playlist_file);
 
     for (const auto& line : reader) {
+        // remove empty lines
+        if (line == "\n" || line == "\r\n" || line == "\r") continue;
         profile_levels.push_back(line);
     }
 
     for (auto& line : profile_levels) {
-        // remove empty lines
-        if (line == "\n" || line == "\r\n" || line == "\r") {
-            profile_levels.erase(std::remove(profile_levels.begin(), profile_levels.end(), line), profile_levels.end());
-        }
-
         // remove line end \n etc
         if (line.length() > 0 && (line[line.length() - 1] == '\n' || line[line.length() - 1] == '\r')) {
             line = line.substr(0, line.length() - 1);

firmware/application/gradient.cpp

@@ -28,13 +28,11 @@ namespace fs = std::filesystem;
 const std::filesystem::path default_gradient_file = u"waterfall.txt";
 
 Gradient::Gradient() {
-    prev_index = 0;
-    prev_r = 0;
-    prev_g = 0;
-    prev_b = 0;
+    step(0, 0, 0, 0);
 }
 
 void Gradient::set_default() {
+    step(0, 0, 0, 0);
     step(86, 0, 0, 255);
     step(171, 0, 255, 0);
     step(255, 255, 0, 0);
@@ -47,6 +45,9 @@ bool Gradient::load_file(const std::filesystem::path& file_path) {
     if (error)
         return false;
 
+    // make sure the table starts at 0
+    step(0, 0, 0, 0);
+
     auto reader = FileLineReader(gradient_file);
     for (const auto& line : reader) {
         if (line.length() == 0 || line[0] == '#')
@@ -73,17 +74,24 @@ bool Gradient::load_file(const std::filesystem::path& file_path) {
         }
     }
 
+    // extend the gradient from the current index to the end of the table
+    step(255, prev_r, prev_g, prev_b);
+
     return true;
 }
 
 void Gradient::step(int16_t index, int16_t r, int16_t g, int16_t b) {
-    for (int16_t i = prev_index; i <= index; i++) {
-        float x = (float)(i - prev_index) / (index - prev_index);
-        float y = 1.0f - x;
+    // prevent division by 0 if index == prev_index
+    int16_t range = index - prev_index;
+    if (range == 0) range = 1;
+
+    for (int16_t i = prev_index; i <= index; i++) {
+        int16_t t = i - prev_index;
+
+        int16_t new_r = prev_r + (t * (r - prev_r) + range / 2) / range;
+        int16_t new_g = prev_g + (t * (g - prev_g) + range / 2) / range;
+        int16_t new_b = prev_b + (t * (b - prev_b) + range / 2) / range;
 
-        int16_t new_r = prev_r * y + r * x;
-        int16_t new_g = prev_g * y + g * x;
-        int16_t new_b = prev_b * y + b * x;
         if (i <= 255) lut[i] = ui::Color(new_r, new_g, new_b);
     }
 

firmware/application/ui/ui_menu.cpp

@@ -159,16 +159,15 @@ size_t MenuView::item_count() const {
     return menu_items.size();
 }
 
-void MenuView::add_item(MenuItem new_item) {
-    menu_items.push_back(new_item);
+void MenuView::add_item(MenuItem&& new_item) {
+    menu_items.push_back(std::move(new_item));
 
     update_items();
 }
 
 void MenuView::add_items(std::initializer_list<MenuItem> new_items) {
-    for (auto item : new_items) {
-        add_item(item);
-    }
+    menu_items.insert(menu_items.end(), new_items);
+    update_items();
 }
 
 void MenuView::update_items() {

firmware/application/ui/ui_menu.hpp

@@ -83,7 +83,10 @@ class MenuView : public View {
 
     ~MenuView();
 
-    void add_item(MenuItem new_item);
+    // This function takes a temporary to avoid copies and heap allocations.
+    // To pass a variable 'item', use add_item(std::move(item)),
+    // or construct the MenuItem in the call, add_item(MenuItem{...})
+    void add_item(MenuItem&& new_item);
     void add_items(std::initializer_list<MenuItem> new_items);
     void clear();
     size_t item_count() const;