What do you want to achieve?
Trying to use drop_shadow, following the example for 9.5, and while it works, there are drawing artefacts left behind. Interestingly the example at Examples - LVGL 9.6 documentation exhibits exactly the same behaviour.
However, if I run the example in the lv_port_pc_vscode simulator it works just fine without the artefacts - this may be because it’s using full refresh for each frame (if I configure my display driver to use full refresh the artefacts disappear, but that’s obviously not an acceptable solution.)
What have you tried so far?
Replicated the example (lvgl/examples/styles/lv_example_style_10.c)
Code to reproduce
/*You code here*/
new(drop) lv_style_t();
lv_style_init(drop);
lv_style_set_drop_shadow_color(drop, lv_color_make(255, 0, 0));
lv_style_set_drop_shadow_offset_x(drop, 5);
lv_style_set_drop_shadow_offset_y(drop, 10);
lv_style_set_drop_shadow_opa(drop, static_cast<uint8_t>(255.0f));
lv_style_set_drop_shadow_radius(drop, 16);
#line 46 "host-test.yaml"
lv_arc_t_id = lv_arc_create(lvgl_lvglcomponent_id->get_screen_active());
lv_obj_set_style_align(lv_arc_t_id, LV_ALIGN_CENTER, LV_PART_MAIN);
lv_obj_add_style(lv_arc_t_id, drop, (lv_state_t)(LV_PART_INDICATOR));
For comparison, here is the example code:
/**
* Using the drop shadow style properties
*/
void lv_example_style_10(void)
{
static lv_style_t style;
lv_style_init(&style);
lv_style_set_drop_shadow_color(&style, lv_palette_main(LV_PALETTE_RED));
lv_style_set_drop_shadow_radius(&style, 16);
lv_style_set_drop_shadow_opa(&style, 255);
lv_style_set_drop_shadow_offset_x(&style, 5);
lv_style_set_drop_shadow_offset_y(&style, 10);
/*Create an object with the new style*/
lv_obj_t * obj = lv_arc_create(lv_screen_active());
lv_obj_add_style(obj, &style, LV_PART_INDICATOR);
lv_obj_center(obj);
}
Screenshot and/or video
Environment
- MCU/MPU/Board: MacOS using SDL2
- LVGL version: 9.5.0