feat: add McpScreen phase 2 display tools

Apps/McpScreen/main/Source/McpScreen.c

@@ -5,6 +5,7 @@
 #include <string.h>
 
 #include <esp_log.h>
+#include <esp_heap_caps.h>
 #include <tt_lvgl.h>
 #include <tt_lvgl_toolbar.h>
 #include <tt_wifi.h>
@@ -44,7 +45,7 @@ void mcp_ui_set_last_tool(McpScreenState* state, const char* tool) {
 }
 
 bool mcp_ui_clear(McpScreenState* state, int color) {
-    if (state == NULL || !state->visible) {
+    if (state == NULL || !state->visible || state->framebuffer == NULL) {
         return false;
     }
 
@@ -52,12 +53,12 @@ bool mcp_ui_clear(McpScreenState* state, int color) {
     if (tt_lvgl_lock(pdMS_TO_TICKS(1500))) {
         if (state->visible && state->draw_area != NULL && lv_obj_is_valid(state->draw_area)) {
             lv_obj_clean(state->draw_area);
-            lv_obj_set_style_bg_color(
-                state->draw_area,
-                color == 1 ? lv_color_black() : lv_color_white(),
-                LV_PART_MAIN
-            );
-            lv_obj_set_style_bg_opa(state->draw_area, LV_OPA_COVER, LV_PART_MAIN);
+            uint16_t fill = color == 1 ? 0x0000 : 0xFFFF;
+            size_t pixel_count = (size_t)state->draw_width * state->draw_height;
+            for (size_t i = 0; i < pixel_count; ++i) {
+                state->framebuffer[i] = fill;
+            }
+            lv_obj_invalidate(state->draw_area);
             state->draw_color = color;
             state->override_active = true;
             success = true;
@@ -127,15 +128,16 @@ static void* create_data(void) {
 }
 
 static void destroy_data(void* data) {
-    free(data);
+    McpScreenState* state = data;
+    if (state != NULL && state->framebuffer != NULL) {
+        heap_caps_free(state->framebuffer);
+    }
+    free(state);
 }
 
 static void on_create(AppHandle app, void* data) {
     McpScreenState* state = data;
     state->app = app;
-    if (!mcp_services_start(state)) {
-        ESP_LOGE(TAG, "One or more MCP services failed to start");
-    }
 }
 
 static void on_destroy(AppHandle app, void* data) {
@@ -145,6 +147,7 @@ static void on_destroy(AppHandle app, void* data) {
 
 static void on_show(AppHandle app, void* data, lv_obj_t* parent) {
     McpScreenState* state = data;
+    ESP_LOGI(TAG, "onShow: starting foreground UI and MCP service");
     state->visible = true;
 
     lv_obj_remove_flag(parent, LV_OBJ_FLAG_SCROLLABLE);
@@ -156,17 +159,27 @@ static void on_show(AppHandle app, void* data, lv_obj_t* parent) {
     lv_obj_align(toolbar, LV_ALIGN_TOP_MID, 0, 0);
 
     state->server_label = lv_label_create(toolbar);
-    lv_label_set_text(state->server_label, state->http_ready ? "MCP :80 ready" : "MCP starting");
+    lv_label_set_text(state->server_label, "MCP starting");
     lv_obj_set_style_text_color(
         state->server_label,
-        state->http_ready ? lv_palette_main(LV_PALETTE_GREEN) : lv_palette_main(LV_PALETTE_ORANGE),
+        lv_palette_main(LV_PALETTE_ORANGE),
         LV_PART_MAIN
     );
 
     state->tool_label = lv_label_create(toolbar);
     lv_label_set_text(state->tool_label, "Last: none");
 
-    state->draw_area = lv_obj_create(parent);
+    if (!mcp_services_start(state)) {
+        ESP_LOGE(TAG, "Failed to start foreground MCP service");
+        lv_label_set_text(state->server_label, "MCP start failed");
+        lv_obj_set_style_text_color(
+            state->server_label,
+            lv_palette_main(LV_PALETTE_RED),
+            LV_PART_MAIN
+        );
+    }
+
+    state->draw_area = lv_canvas_create(parent);
     lv_obj_set_width(state->draw_area, LV_PCT(100));
     lv_obj_set_flex_grow(state->draw_area, 1);
     lv_obj_set_style_radius(state->draw_area, 0, LV_PART_MAIN);
@@ -182,9 +195,39 @@ static void on_show(AppHandle app, void* data, lv_obj_t* parent) {
     state->draw_width = lv_obj_get_content_width(state->draw_area);
     state->draw_height = lv_obj_get_content_height(state->draw_area);
 
+    size_t required_size = (size_t)state->draw_width * state->draw_height * sizeof(uint16_t);
+    if (state->framebuffer == NULL || state->framebuffer_size != required_size) {
+        if (state->framebuffer != NULL) {
+            heap_caps_free(state->framebuffer);
+            state->framebuffer = NULL;
+        }
+        state->framebuffer = heap_caps_malloc(required_size, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT);
+        if (state->framebuffer == NULL) {
+            state->framebuffer = heap_caps_malloc(required_size, MALLOC_CAP_8BIT);
+        }
+        state->framebuffer_size = state->framebuffer == NULL ? 0 : required_size;
+    }
+
+    if (state->framebuffer == NULL) {
+        ESP_LOGE(TAG, "Failed to allocate %u-byte framebuffer", (unsigned)required_size);
+        lv_obj_t* error = lv_label_create(state->draw_area);
+        lv_label_set_text(error, "Framebuffer allocation failed");
+        lv_obj_center(error);
+        return;
+    }
+
+    lv_canvas_set_buffer(
+        state->draw_area,
+        state->framebuffer,
+        state->draw_width,
+        state->draw_height,
+        LV_COLOR_FORMAT_RGB565
+    );
+
     if (!state->override_active) {
-        lv_obj_set_style_bg_color(state->draw_area, lv_color_hex(0x101820), LV_PART_MAIN);
-        lv_obj_set_style_bg_opa(state->draw_area, LV_OPA_COVER, LV_PART_MAIN);
+        for (size_t i = 0; i < (size_t)state->draw_width * state->draw_height; ++i) {
+            state->framebuffer[i] = 0x10C3;
+        }
         state->draw_color = 1;
 
         lv_obj_t* title = lv_label_create(state->draw_area);
@@ -215,12 +258,15 @@ static void on_show(AppHandle app, void* data, lv_obj_t* parent) {
         lv_obj_set_style_text_color(wifi, lv_color_white(), LV_PART_MAIN);
         lv_obj_align(wifi, LV_ALIGN_CENTER, 0, 48);
     }
+
 }
 
 static void on_hide(AppHandle app, void* data) {
     (void)app;
     McpScreenState* state = data;
+    ESP_LOGI(TAG, "onHide: stopping foreground MCP service");
     state->visible = false;
+    mcp_services_hide(state);
     state->draw_area = NULL;
     state->server_label = NULL;
     state->tool_label = NULL;