Add support for scene snapshot storage with color mode handling in DaliDT8

src/dt8.cpp

@@ -192,6 +192,15 @@ bool DaliDT8::setTemporaryRGBWAFControl(int a, int control) {
          base_.sendExtCmd(addr, DALI_CMD_DT8_SET_TEMPORARY_RGBWAF_CONTROL);
 }
 
+bool DaliDT8::setTemporaryColourMask(int a) {
+  if (setTemporaryRGBDimLevels(a, 255, 255, 255)) return true;
+  if (base_.setDTR(0xFF) && base_.setDTR1(0xFF) && base_.dtSelect(8) && base_.setDTRAsColourTemp(a)) {
+    return true;
+  }
+  const int addr = DaliComm::toCmdAddr(a);
+  return setTemporaryColourXRaw(addr, 0xFFFF) && setTemporaryColourYRaw(addr, 0xFFFF);
+}
+
 bool DaliDT8::copyReportToTemporary(int a) { return base_.dtSelect(8) && base_.copyReportColourToTemp(a); }
 
 bool DaliDT8::stepXUp(int a) {
@@ -287,6 +296,38 @@ std::vector<int> DaliDT8::getColourRGB(int a) {
   return {rgb[0], rgb[1], rgb[2]};
 }
 
+bool DaliDT8::storeSceneSnapshot(int address, int scene, int brightness,
+                                 Dt8SceneStoreColorMode colorMode, int colorTemperature, int red,
+                                 int green, int blue) {
+  const int sceneBrightness = std::clamp(brightness, 0, 255);
+  const int sceneIndex = std::clamp(scene, 0, 15);
+
+  if (sceneBrightness != 255) {
+    switch (colorMode) {
+      case Dt8SceneStoreColorMode::colorTemperature:
+        if (!setTemporaryColourTemperature(address, colorTemperature)) return false;
+        break;
+      case Dt8SceneStoreColorMode::rgb: {
+        const int r = std::clamp(red, 0, 255);
+        const int g = std::clamp(green, 0, 255);
+        const int b = std::clamp(blue, 0, 255);
+        const auto xy = DaliColor::rgb2xy(static_cast<double>(r) / 255.0,
+                                          static_cast<double>(g) / 255.0,
+                                          static_cast<double>(b) / 255.0);
+        if (!setTemporaryColourXY(address, xy[0], xy[1])) return false;
+        break;
+      }
+      case Dt8SceneStoreColorMode::disabled:
+        if (!setTemporaryColourMask(address)) return false;
+        break;
+    }
+  }
+
+  if (!base_.setDTR(sceneBrightness)) return false;
+  // DT SELECT is one-shot and SET DTR consumes any earlier selection.
+  return base_.dtSelect(8) && base_.storeDTRAsSceneBright(address, sceneIndex);
+}
+
 bool DaliDT8::activateTemporaryColour(int a) { return base_.dtSelect(8) && base_.activate(a); }
 
 std::optional<int> DaliDT8::getPrimaryDimLevel(int a, int n) {