feat(assets): embed LCD and audio resources in OTA app

components/platform/src/lcd_direct.c

@@ -7,15 +7,13 @@
 
 #include "lcd_direct.h"
 #include "lcd_direct_assets.h"
+#include "platform_asset_bundle.h"
 
-#include <errno.h>
-#include <fcntl.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
-#include <unistd.h>
 
 #include "driver/gpio.h"
 #include "driver/ledc.h"
@@ -55,7 +53,7 @@
 #define LCD_DIRECT_PREHEAT_WAIT_TIMEOUT_MS 5000U
 /*
  * PNG 缓存固定6项并使用 LRU 淘汰，限制 PSRAM 峰值；边界测试恰好覆盖一次完整
- * 缓存命中周期。路径上限同时约束缓存键和 LittleFS 资源路径复制。
+ * 缓存命中周期。名称上限同时约束缓存键和嵌入式素材索引。
  */
 #define LCD_DIRECT_FRAME_CACHE_MAX 6U
 #define LCD_DIRECT_BOUNDARY_TEST_CACHE_HIT_FRAMES LCD_DIRECT_FRAME_CACHE_MAX
@@ -316,55 +314,6 @@ static uint16_t lcd_direct_blend_rgb565(uint16_t dst, uint16_t src, uint8_t alph
     return lcd_direct_rgb888_to_rgb565(out_r, out_g, out_b);
 }
 
-static esp_err_t lcd_direct_read_file_psram(const char *path, unsigned char **out_data, size_t *out_size)
-{
-    /* 整个 PNG 文件优先读入 PSRAM；任何短读都视为失败并关闭句柄。 */
-    ESP_RETURN_ON_FALSE(path != NULL && out_data != NULL && out_size != NULL,
-                        ESP_ERR_INVALID_ARG,
-                        TAG,
-                        "invalid PNG read request");
-    *out_data = NULL;
-    *out_size = 0;
-
-    errno = 0;
-    int fd = open(path, O_RDONLY);
-    if (fd < 0) {
-        ESP_LOGE(TAG, "open PNG asset failed path=%s errno=%d", path, errno);
-        return ESP_ERR_NOT_FOUND;
-    }
-
-    off_t file_size = lseek(fd, 0, SEEK_END);
-    if (file_size <= 0 || lseek(fd, 0, SEEK_SET) < 0) {
-        ESP_LOGE(TAG, "stat PNG asset failed path=%s errno=%d", path, errno);
-        close(fd);
-        return ESP_FAIL;
-    }
-
-    unsigned char *data = (unsigned char *)lcd_direct_alloc_psram((size_t)file_size);
-    if (data == NULL) {
-        ESP_LOGE(TAG, "allocate PNG file buffer failed path=%s size=%u", path, (unsigned)file_size);
-        close(fd);
-        return ESP_ERR_NO_MEM;
-    }
-
-    size_t offset = 0;
-    while (offset < (size_t)file_size) {
-        ssize_t bytes_read = read(fd, data + offset, (size_t)file_size - offset);
-        if (bytes_read <= 0) {
-            ESP_LOGE(TAG, "read PNG asset failed path=%s errno=%d", path, errno);
-            free(data);
-            close(fd);
-            return ESP_FAIL;
-        }
-        offset += (size_t)bytes_read;
-    }
-
-    close(fd);
-    *out_data = data;
-    *out_size = (size_t)file_size;
-    return ESP_OK;
-}
-
 static void lcd_direct_release_decoded_image(lcd_direct_decoded_image_t *decoded)
 {
     if (decoded == NULL) {
@@ -386,18 +335,19 @@ static esp_err_t lcd_direct_decode_png(const char *path,
                         "invalid PNG decode request");
     memset(out_decoded, 0, sizeof(*out_decoded));
 
-    unsigned char *png_data = NULL;
-    size_t png_size = 0;
-    esp_err_t read_err = lcd_direct_read_file_psram(path, &png_data, &png_size);
-    if (read_err != ESP_OK) {
-        return read_err;
+    /* PNG 字节直接取自应用镜像的只读映射区；解码器只读取输入，不持有或释放该指针。 */
+    platform_asset_view_t asset = {0};
+    esp_err_t find_err = platform_asset_find(path, &asset);
+    if (find_err != ESP_OK) {
+        ESP_LOGE(TAG, "find PNG asset failed path=%s err=%s", path, esp_err_to_name(find_err));
+        return find_err;
     }
 
     unsigned char *rgba = NULL;
     unsigned width = 0;
     unsigned height = 0;
-    unsigned decode_err = lodepng_esp_decode32(&rgba, &width, &height, png_data, png_size);
-    free(png_data);
+    unsigned decode_err = lodepng_esp_decode32(&rgba, &width, &height,
+                                               asset.data, asset.size);
     if (decode_err != 0U) {
         ESP_LOGE(TAG, "decode PNG failed path=%s error=%u text=%s",
                  path,