acid-drop

- Hacking the planet from a LilyGo T-Deck using custom firmware
git clone git://git.acid.vegas/acid-drop.git
lv_example_snapshot_1.py (2170B)
      1 import gc
      2 import lvgl as lv
      3 from imagetools import get_png_info, open_png
      4 
      5 # Register PNG image decoder
      6 decoder = lv.img.decoder_create()
      7 decoder.info_cb = get_png_info
      8 decoder.open_cb = open_png
      9 
     10 # Measure memory usage
     11 gc.enable()
     12 gc.collect()
     13 mem_free = gc.mem_free()
     14 
     15 label = lv.label(lv.scr_act())
     16 label.align(lv.ALIGN.BOTTOM_MID, 0, -10)
     17 label.set_text(" memory free:" + str(mem_free/1024) + " kB")
     18 
     19 # Create an image from the png file
     20 try:
     21     with open('../../assets/img_star.png','rb') as f:
     22         png_data = f.read()
     23 except:
     24     print("Could not find star.png")
     25     sys.exit()
     26 
     27 img_star = lv.img_dsc_t({
     28   'data_size': len(png_data),
     29   'data': png_data
     30 })
     31 
     32 def event_cb(e, snapshot_obj):
     33     img = e.get_target()
     34 
     35     if snapshot_obj:
     36         # no need to free the old source for snapshot_obj, gc will free it for us.
     37 
     38         # take a new snapshot, overwrite the old one
     39         dsc = lv.snapshot_take(img.get_parent(), lv.img.CF.TRUE_COLOR_ALPHA)
     40         snapshot_obj.set_src(dsc)
     41 
     42     gc.collect()
     43     mem_used = mem_free - gc.mem_free()
     44     label.set_text("memory used:" + str(mem_used/1024) + " kB")
     45 
     46 root = lv.scr_act()
     47 root.set_style_bg_color(lv.palette_main(lv.PALETTE.LIGHT_BLUE), 0)
     48 
     49 # Create an image object to show snapshot
     50 snapshot_obj = lv.img(root)
     51 snapshot_obj.set_style_bg_color(lv.palette_main(lv.PALETTE.PURPLE), 0)
     52 snapshot_obj.set_style_bg_opa(lv.OPA.COVER, 0)
     53 snapshot_obj.set_zoom(128)
     54 
     55 # Create the container and its children
     56 container = lv.obj(root)
     57 container.align(lv.ALIGN.CENTER, 0, 0)
     58 container.set_size(180, 180)
     59 container.set_flex_flow(lv.FLEX_FLOW.ROW_WRAP)
     60 container.set_flex_align(lv.FLEX_ALIGN.SPACE_EVENLY, lv.FLEX_ALIGN.CENTER, lv.FLEX_ALIGN.CENTER)
     61 container.set_style_radius(50, 0)
     62 
     63 for i in range(4):
     64     img = lv.img(container)
     65     img.set_src(img_star)
     66     img.set_style_bg_color(lv.palette_main(lv.PALETTE.GREY), 0)
     67     img.set_style_bg_opa(lv.OPA.COVER, 0)
     68     img.set_style_transform_zoom(400, lv.STATE.PRESSED)
     69     img.add_flag(img.FLAG.CLICKABLE)
     70     img.add_event_cb(lambda e: event_cb(e, snapshot_obj), lv.EVENT.PRESSED, None)
     71     img.add_event_cb(lambda e: event_cb(e, snapshot_obj), lv.EVENT.RELEASED, None)