Added FFT hold feature

core/src/core.cpp

@@ -108,6 +108,8 @@ int sdrpp_main(int argc, char* argv[]) {
     defConfig["bandPlanPos"] = 0;
     defConfig["centerTuning"] = false;
     defConfig["colorMap"] = "Classic";
+    defConfig["fftHold"] = false;
+    defConfig["fftHoldSpeed"] = 60;
     defConfig["fastFFT"] = false;
     defConfig["fftHeight"] = 300;
     defConfig["fftRate"] = 20;

core/src/gui/menus/display.cpp

@@ -21,6 +21,8 @@ namespace displaymenu {
     int fftRate = 20;
     int uiScaleId = 0;
     bool restartRequired = false;
+    bool fftHold = false;
+    int fftHoldSpeed = 60;
 
     OptionList<float, float> uiScales;
 
@@ -50,6 +52,10 @@ namespace displaymenu {
 
     int fftSizeId = 0;
 
+    void updateFFTHoldSpeed() {
+        gui::waterfall.setFFTHoldSpeed(fftHoldSpeed / (fftRate * 10.0f));
+    }
+
     void init() {
         showWaterfall = core::configManager.conf["showWaterfall"];
         showWaterfall ? gui::waterfall.showWaterfall() : gui::waterfall.hideWaterfall();
@@ -93,6 +99,11 @@ namespace displaymenu {
 
         gui::menu.locked = core::configManager.conf["lockMenuOrder"];
 
+        fftHold = core::configManager.conf["fftHold"];
+        fftHoldSpeed = core::configManager.conf["fftHoldSpeed"];
+        gui::waterfall.setFFTHold(fftHold);
+        updateFFTHoldSpeed();
+
         // Define and load UI scales
         uiScales.define(1.0f, "100%", 1.0f);
         uiScales.define(2.0f, "200%", 2.0f);
@@ -132,6 +143,22 @@ namespace displaymenu {
             core::configManager.release(true);
         }
 
+        if (ImGui::Checkbox("FFT Hold##_sdrpp", &fftHold)) {
+            gui::waterfall.setFFTHold(fftHold);
+            core::configManager.acquire();
+            core::configManager.conf["fftHold"] = fftHold;
+            core::configManager.release(true);
+        }
+
+        ImGui::LeftLabel("FFT Hold Speed");
+        ImGui::FillWidth();
+        if (ImGui::InputInt("##sdrpp_fft_hold_speed", &fftHoldSpeed)) {
+            updateFFTHoldSpeed();
+            core::configManager.acquire();
+            core::configManager.conf["fftHoldSpeed"] = fftHoldSpeed;
+            core::configManager.release(true);
+        }
+
         ImGui::LeftLabel("High-DPI Scaling");
         ImGui::FillWidth();
         if (ImGui::Combo("##sdrpp_ui_scale", &uiScaleId, uiScales.txt)) {
@@ -146,6 +173,7 @@ namespace displaymenu {
         if (ImGui::InputInt("##sdrpp_fft_rate", &fftRate, 1, 10)) {
             fftRate = std::max<int>(1, fftRate);
             sigpath::signalPath.setFFTRate(fftRate);
+            updateFFTHoldSpeed();
             core::configManager.acquire();
             core::configManager.conf["fftRate"] = fftRate;
             core::configManager.release(true);

core/src/gui/theme_manager.cpp

@@ -84,7 +84,7 @@ bool ThemeManager::loadTheme(std::string path) {
         if (param == "name" || param == "author") { continue; }
 
         // Exception for non-imgu colors
-        if (param == "WaterfallBackground" || param == "ClearColor") {
+        if (param == "WaterfallBackground" || param == "ClearColor" || param == "FFTHoldColor") {
             if (val[0] != '#' || !std::all_of(val.begin() + 1, val.end(), ::isxdigit) || val.length() != 9) {
                 spdlog::error("Theme {0} contains invalid {1} field. Expected hex RGBA color", path, param);
                 return false;
@@ -152,6 +152,12 @@ bool ThemeManager::applyTheme(std::string name) {
             continue;
         }
 
+        if (param == "FFTHoldColor") {
+            decodeRGBA(val, ret);
+            fftHoldColor = ImVec4((float)ret[0] / 255.0f, (float)ret[1] / 255.0f, (float)ret[2] / 255.0f, (float)ret[3] / 255.0f);
+            continue;
+        }
+
         // If param is a color, check that it's a valid RGBA hex value
         if (IMGUI_COL_IDS.find(param) != IMGUI_COL_IDS.end()) {
             decodeRGBA(val, ret);

core/src/gui/theme_manager.h

@@ -21,7 +21,7 @@ public:
     std::vector<std::string> getThemeNames();
 
     ImVec4 waterfallBg = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
-    ;
+    ImVec4 fftHoldColor = ImVec4(0.0f, 1.0f, 0.75f, 1.0f);
     ImVec4 clearColor = ImVec4(0.0666f, 0.0666f, 0.0666f, 1.0f);
 
 private:

core/src/gui/widgets/waterfall.cpp

@@ -76,8 +76,8 @@ namespace ImGui {
         lastWidgetPos.y = 0;
         lastWidgetSize.x = 0;
         lastWidgetSize.y = 0;
-        latestFFT = new float[1];
+        latestFFT = new float[dataWidth];
-        latestFFTHold = new float[1];
+        latestFFTHold = new float[dataWidth];
         waterfallFb = new uint32_t[1];
 
         viewBandwidth = 1.0;
@@ -98,7 +98,7 @@ namespace ImGui {
         char buf[100];
 
         ImU32 trace = ImGui::GetColorU32(ImGuiCol_PlotLines);
-        ImU32 traceHold = ImGui::ColorConvertFloat4ToU32(ImVec4(1.0, 1.0, 0.0, 1.0));
+        ImU32 traceHold = ImGui::ColorConvertFloat4ToU32(gui::themeManager.fftHoldColor);
         ImU32 shadow = ImGui::GetColorU32(ImGuiCol_PlotLines, 0.2);
         ImU32 text = ImGui::GetColorU32(ImGuiCol_Text);
         float textVOffset = 10.0f * style::uiScale;
@@ -888,7 +888,7 @@ namespace ImGui {
         // If FFT hold is enabled, update it
         if (fftHold && latestFFT != NULL && latestFFTHold != NULL && fftLines != 0) {
             for (int i = 1; i < dataWidth; i++) {
-                latestFFTHold[i] = std::max<float>(latestFFT[i], latestFFTHold[i] - 0.3f);
+                latestFFTHold[i] = std::max<float>(latestFFT[i], latestFFTHold[i] - fftHoldSpeed);
             }
         }
 
@@ -1112,6 +1112,10 @@ namespace ImGui {
         }
     }
 
+    void WaterFall::setFFTHoldSpeed(float speed) {
+        fftHoldSpeed = speed;
+    }
+
     void WaterfallVFO::setOffset(double offset) {
         generalOffset = offset;
         if (reference == REF_CENTER) {

core/src/gui/widgets/waterfall.h

@@ -177,6 +177,7 @@ namespace ImGui {
         void setBandPlanPos(int pos);
 
         void setFFTHold(bool hold);
+        void setFFTHoldSpeed(float speed);
 
         bool centerFreqMoved = false;
         bool vfoFreqChanged = false;
@@ -328,6 +329,7 @@ namespace ImGui {
         int bandPlanPos = BANDPLAN_POS_BOTTOM;
 
         bool fftHold = false;
+        float fftHoldSpeed = 0.3f;
 
         // UI Select elements
         bool fftResizeSelect = false;

root/res/themes/dark.json

@@ -9,6 +9,7 @@
     "CheckMark": "#3D84E0FF",
     "ChildBg": "#FFFFFF00",
     "DragDropTarget": "#FFFF00E5",
+    "FFTHoldColor": "#FFFF00FF",
     "FrameBg": "#33353889",
     "FrameBgActive": "#33353889",
     "FrameBgHovered": "#33353889",

root/res/themes/light.json

@@ -9,6 +9,7 @@
     "CheckMark": "#3D84E0FF",
     "ChildBg": "#00000000",
     "DragDropTarget": "#0000FFE5",
+    "FFTHoldColor": "#C08000FF",
     "FrameBg": "#ACA7A389",
     "FrameBgActive": "#ACA7A389",
     "FrameBgHovered": "#ACA7A389",