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Code Issues Releases Wiki Activity

[lvgl] memset canvas buffer to prevent display of random garbage (#11582)

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Co-authored-by: clydebarrow <2366188+clydebarrow@users.noreply.github.com>
This commit is contained in:
Stuart Parmenter
2025-10-29 14:06:45 -07:00
committed by GitHub
parent 287f65cbaf
commit 918650f15a
1 changed files with 12 additions and 9 deletions
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21
esphome/components/lvgl/widgets/canvas.py
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@@ -33,7 +33,7 @@ from ..lv_validation import (
pixels,
size,
)
from ..lvcode import LocalVariable, lv, lv_assign
from ..lvcode import LocalVariable, lv, lv_assign, lv_expr
from ..schemas import STYLE_PROPS, STYLE_REMAP, TEXT_SCHEMA, point_schema
from ..types import LvType, ObjUpdateAction, WidgetType
from . import Widget, get_widgets
@@ -70,15 +70,18 @@ class CanvasType(WidgetType):
width = config[CONF_WIDTH]
height = config[CONF_HEIGHT]
use_alpha = "_ALPHA" if config[CONF_TRANSPARENT] else ""
lv.canvas_set_buffer(
w.obj,
lv.custom_mem_alloc(
literal(f"LV_CANVAS_BUF_SIZE_TRUE_COLOR{use_alpha}({width}, {height})")
),
width,
height,
literal(f"LV_IMG_CF_TRUE_COLOR{use_alpha}"),
buf_size = literal(
f"LV_CANVAS_BUF_SIZE_TRUE_COLOR{use_alpha}({width}, {height})"
)
with LocalVariable("buf", cg.void, lv_expr.custom_mem_alloc(buf_size)) as buf:
cg.add(cg.RawExpression(f"memset({buf}, 0, {buf_size});"))
lv.canvas_set_buffer(
w.obj,
buf,
width,
height,
literal(f"LV_IMG_CF_TRUE_COLOR{use_alpha}"),
)
canvas_spec = CanvasType()