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Code Issues Packages Projects Releases Wiki Activity

ImageView: Try free'ing up memory

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This commit is contained in:
Thomas Farstrike
2025-06-11 22:41:35 +02:00
parent 46526c65af
commit b80e0903a9
1 changed files with 19 additions and 2 deletions
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internal_filesystem/apps/com.micropythonos.imageview/assets/imageview.py
+19 -2
View File
@@ -1,3 +1,4 @@
import gc
import os
import time
@@ -21,6 +22,7 @@ class ImageView(Activity):
# Widgets
image = None
gif = None
current_image_dsc = None # Track current image descriptor
def onCreate(self):
screen = lv.obj()
@@ -208,6 +210,7 @@ class ImageView(Activity):
def show_image(self, name):
try:
self.label.set_text(name)
self.clear_image()
if name.lower().endswith(".gif"):
print("switching to gif mode...")
self.image.add_flag(lv.obj.FLAG.HIDDEN)
@@ -233,7 +236,7 @@ class ImageView(Activity):
cf = lv.COLOR_FORMAT.RGB565
if color_format != "RGB565":
print(f"WARNING: unknown color format {color_format}, assuming RGB565...")
image_dsc = lv.image_dsc_t({
self.current_image_dsc = lv.image_dsc_t({
"header": {
"magic": lv.IMAGE_HEADER_MAGIC,
"w": width,
@@ -244,7 +247,7 @@ class ImageView(Activity):
'data_size': len(image_data),
'data': image_data
})
self.image.set_src(image_dsc)
self.image.set_src(self.current_image_dsc)
self.scale_image()
except OSError as e:
print(f"show_image got exception: {e}")
@@ -261,6 +264,8 @@ class ImageView(Activity):
self.image.decoder_get_info(self.image.get_src(), header)
image_w = header.w
image_h = header.h
if image_w == 0 or image_h == 0:
return
print(f"the real image has size: {header.w}x{header.h}")
scale_factor_w = round(lvgl_w * 256 / image_w)
scale_factor_h = round(lvgl_h * 256 / image_h)
@@ -270,3 +275,15 @@ class ImageView(Activity):
#self.image.set_scale(max(scale_factor_w,scale_factor_h)) # fills the entire screen but cuts off borders
self.image.set_scale(min(scale_factor_w,scale_factor_h))
print(f"after set_scale, the LVGL image has size: {self.image.get_width()}x{self.image.get_height()}")
def clear_image(self):
"""Clear current image or GIF source to free memory."""
if self.current_image_dsc:
self.current_image_dsc = None # Release reference to descriptor
self.image.set_src(None) # Clear image source
self.gif.set_src(None) # Clear GIF source
#self.gif.add_flag(lv.obj.FLAG.HIDDEN)
#self.image.remove_flag(lv.obj.FLAG.HIDDEN)
#lv.image_cache_invalidate_src(None) # Invalidate LVGL image cache
gc.collect() # Force garbage collection