feat(examples) adjust micropython examples to use lv_png (#3639)

examples/libs/png/lv_example_png_1.py

@@ -1,12 +1,7 @@
 #!/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(
     {

examples/others/snapshot/lv_example_snapshot_1.py

@@ -1,11 +1,5 @@
 import gc
 import lvgl as lv
-from imagetools import get_png_info, open_png
-
-# Register PNG image decoder
-decoder = lv.img.decoder_create()
-decoder.info_cb = get_png_info
-decoder.open_cb = open_png
 
 # Measure memory usage
 gc.enable()

examples/styles/lv_example_style_6.py

@@ -1,9 +1,3 @@
-from imagetools import get_png_info, open_png
-# Register PNG image decoder
-decoder = lv.img.decoder_create()
-decoder.info_cb = get_png_info
-decoder.open_cb = open_png
-
 # Create an image from the png file
 try:
     with open('../assets/img_cogwheel_argb.png', 'rb') as f:

examples/widgets/animimg/lv_example_animimg_1.py

@@ -1,10 +1,3 @@
-from imagetools import get_png_info, open_png
-
-# Register PNG image decoder
-decoder = lv.img.decoder_create()
-decoder.info_cb = get_png_info
-decoder.open_cb = open_png
-
 anim_imgs = [None]*3
 # Create an image from the png file
 try:

examples/widgets/btnmatrix/lv_example_btnmatrix_2.py

@@ -1,10 +1,3 @@
-from imagetools import get_png_info, open_png
-
-# Register PNG image decoder
-decoder = lv.img.decoder_create()
-decoder.info_cb = get_png_info
-decoder.open_cb = open_png
-
 # Create an image from the png file
 try:
     with open('../../assets/img_star.png','rb') as f:

examples/widgets/dropdown/lv_example_dropdown_3.py

@@ -1,10 +1,3 @@
-from imagetools import get_png_info, open_png
-
-# Register PNG image decoder
-decoder = lv.img.decoder_create()
-decoder.info_cb = get_png_info
-decoder.open_cb = open_png
-
 # Create an image from the png file
 try:
     with open('../../assets/img_caret_down.png','rb') as f:

examples/widgets/img/lv_example_img_1.py

@@ -2,12 +2,6 @@
 import usys as sys
 import lvgl as lv
 import display_driver
-from imagetools import get_png_info, open_png
-
-# Register PNG image decoder
-decoder = lv.img.decoder_create()
-decoder.info_cb = get_png_info
-decoder.open_cb = open_png
 
 # Create an image from the png file
 try:

examples/widgets/img/lv_example_img_2.py

@@ -2,12 +2,6 @@
 import usys as sys
 import lvgl as lv
 import display_driver
-from imagetools import get_png_info, open_png
-
-# Register PNG image decoder
-decoder = lv.img.decoder_create()
-decoder.info_cb = get_png_info
-decoder.open_cb = open_png
 
 # Create an image from the png file
 try:

examples/widgets/img/lv_example_img_3.py

@@ -2,12 +2,6 @@
 import usys as sys
 import lvgl as lv
 import display_driver
-from imagetools import get_png_info, open_png
-
-# Register PNG image decoder
-decoder = lv.img.decoder_create()
-decoder.info_cb = get_png_info
-decoder.open_cb = open_png
 
 # Create an image from the png file
 try:

examples/widgets/img/lv_example_img_4.py

@@ -1,14 +1,8 @@
-from imagetools import get_png_info, open_png
 
 def ofs_y_anim(img, v):
     img.set_offset_y(v)
     # print(img,v)
 
-# Register PNG image decoder
-decoder = lv.img.decoder_create()
-decoder.info_cb = get_png_info
-decoder.open_cb = open_png
-
 # Create an image from the png file
 try:
     with open('../../assets/img_skew_strip.png','rb') as f:

examples/widgets/imgbtn/lv_example_imgbtn_1.py

@@ -1,10 +1,3 @@
-from imagetools import get_png_info, open_png
-
-# Register PNG image decoder
-decoder = lv.img.decoder_create()
-decoder.info_cb = get_png_info
-decoder.open_cb = open_png
-
 # Create an image from the png file
 try:
     with open('../../assets/imgbtn_left.png','rb') as f:

examples/widgets/meter/lv_example_meter_3.py

@@ -2,12 +2,6 @@
 import utime as time
 import lvgl as lv
 import display_driver
-from imagetools import get_png_info, open_png
-
-# Register PNG image decoder
-decoder = lv.img.decoder_create()
-decoder.info_cb = get_png_info
-decoder.open_cb = open_png
 
 # Create an image from the png file
 try: