[color][lvgl] Allow Color to be used for lv_color_t (#10016)

esphome/core/color.h

@@ -1,8 +1,13 @@
 #pragma once
 
+#include "defines.h"
 #include "component.h"
 #include "helpers.h"
 
+#ifdef USE_LVGL
+#include "esphome/components/lvgl/lvgl_proxy.h"
+#endif  // USE_LVGL
+
 namespace esphome {
 
 inline static constexpr uint8_t esp_scale8(uint8_t i, uint8_t scale) {
@@ -33,6 +38,11 @@ struct Color {
     uint32_t raw_32;
   };
 
+#ifdef USE_LVGL
+  // convenience function for Color to get a lv_color_t representation
+  operator lv_color_t() const { return lv_color_make(this->r, this->g, this->b); }
+#endif
+
   inline constexpr Color() ESPHOME_ALWAYS_INLINE : raw_32(0) {}  // NOLINT
   inline constexpr Color(uint8_t red, uint8_t green, uint8_t blue) ESPHOME_ALWAYS_INLINE : r(red),
                                                                                            g(green),

tests/components/lvgl/lvgl-package.yaml

@@ -78,7 +78,7 @@ lvgl:
     - id: date_style
       text_font: roboto10
       align: center
-      text_color: color_id2
+      text_color: !lambda return color_id2;
       bg_opa: cover
       radius: 4
       pad_all: 2