temp

Author: asymptonic

DASH/Drivers/lvgl/examples/libs/png/img_wink_png.c

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+Open a PNG image from file and variable
+"""""""""""""""""""""""""""""""""""""""""""""""
+
+.. lv_example:: libs/png/lv_example_png_1
+  :language: c
+

DASH/Drivers/lvgl/examples/libs/png/img_wink_png.py

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+/**
+ * @file lv_example_png.h
+ *
+ */
+
+#ifndef LV_EXAMPLE_PNG_H
+#define LV_EXAMPLE_PNG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+void lv_example_png_1(void);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#ifdef __cplusplus
+} /*extern "C"*/
+#endif
+
+#endif /*LV_EXAMPLE_PNG_H*/

DASH/Drivers/lvgl/examples/libs/png/index.rst

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+#include "../../lv_examples.h"
+#if LV_USE_PNG && LV_USE_IMG && LV_BUILD_EXAMPLES
+
+/**
+ * Open a PNG image from a file and a variable
+ */
+void lv_example_png_1(void)
+{
+    LV_IMG_DECLARE(img_wink_png);
+    lv_obj_t * img;
+
+    img = lv_img_create(lv_scr_act());
+    lv_img_set_src(img, &img_wink_png);
+    lv_obj_align(img, LV_ALIGN_LEFT_MID, 20, 0);
+
+    img = lv_img_create(lv_scr_act());
+    /* Assuming a File system is attached to letter 'A'
+     * E.g. set LV_USE_FS_STDIO 'A' in lv_conf.h */
+    lv_img_set_src(img, "A:lvgl/examples/libs/png/wink.png");
+    lv_obj_align(img, LV_ALIGN_RIGHT_MID, -20, 0);
+}
+
+#endif

DASH/Drivers/lvgl/examples/libs/png/lv_example_png.h

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+#!/opt/bin/lv_micropython -i
+import lvgl as lv
+import display_driver
+from imagetools import get_png_info, open_png
+from img_wink_png import img_wink_png_map
+# Register PNG image decoder
+decoder = lv.img.decoder_create()
+decoder.info_cb = get_png_info
+decoder.open_cb = open_png
+
+img_wink_png = lv.img_dsc_t(
+    {
+        "header": {"always_zero": 0, "w": 50, "h": 50,  "cf": lv.img.CF.RAW_ALPHA},
+        "data_size": 5158,
+        "data": img_wink_png_map,
+    }
+)
+img1 = lv.img(lv.scr_act())
+img1.set_src(img_wink_png)
+img1.align(lv.ALIGN.RIGHT_MID, -250, 0)
+
+# Create an image from the png file
+try:
+    with open('wink.png','rb') as f:
+        png_data = f.read()
+except:
+    print("Could not find wink.png")
+    sys.exit()
+
+wink_argb = lv.img_dsc_t({
+  'data_size': len(png_data),
+  'data': png_data
+})
+
+img2 = lv.img(lv.scr_act())
+img2.set_src(wink_argb)
+img2.align(lv.ALIGN.RIGHT_MID, -150, 0)