Update LVGL to v9.1.0

lib/lvgl/examples/libs/libpng/index.rst

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+Open a PNG image from file
+--------------------------
+
+.. lv_example:: libs/libpng/lv_example_libpng_1
+  :language: c
+

lib/lvgl/examples/libs/libpng/lv_example_libpng.h

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+/**
+ * @file lv_example_libpng.h
+ *
+ */
+
+#ifndef LV_EXAMPLE_LIBPNG_H
+#define LV_EXAMPLE_LIBPNG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+void lv_example_libpng_1(void);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#ifdef __cplusplus
+} /*extern "C"*/
+#endif
+
+#endif /*LV_EXAMPLE_LIBPNG_H*/

lib/lvgl/examples/libs/libpng/lv_example_libpng_1.c

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+#include "../../lv_examples.h"
+#if LV_BUILD_EXAMPLES
+
+#if LV_USE_LIBPNG
+
+/**
+ * Open a PNG image from a file
+ */
+void lv_example_libpng_1(void)
+{
+    lv_obj_t * img;
+
+    img = lv_image_create(lv_screen_active());
+    /* Assuming a File system is attached to letter 'A'
+     * E.g. set LV_USE_FS_STDIO 'A' in lv_conf.h */
+    lv_image_set_src(img, "A:lvgl/examples/libs/libpng/png_demo.png");
+    lv_obj_center(img);
+}
+
+#else
+
+void lv_example_libpng_1(void)
+{
+    lv_obj_t * label = lv_label_create(lv_screen_active());
+    lv_label_set_text(label, "LibPNG is not installed");
+    lv_obj_center(label);
+}
+
+#endif
+
+#endif