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docs(disp): fix typos

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Gabor Kiss-Vamosi 2023-02-24 11:35:37 +01:00 committed by GitHub
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docs/overview/display.md
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@ -25,9 +25,9 @@ By default, the last created (and only) display is used.
If you pass `NULL` as `disp` parameter to display related functions the default display will usually be used.
E.g. `lv_disp_trig_activity(NULL)` will trigger a user activity on the default display. (See below in [Inactivity](#Inactivity)).
### Mirror display
### Duplicate display
To mirror the image of a display to another display, you don't need to use multi-display support. Just transfer the buffer received in `flush_cb` to the other display too.
To duplicate the image of a display to another display, you don't need to the use multi-display support. Just transfer the buffer received in `flush_cb` to the other display too.
### Split image
You can create a larger virtual display from an array of smaller ones. You can create it as below:
@ -57,7 +57,7 @@ Screens can be deleted with `lv_obj_del(scr)`, but ensure that you do not delete
### Transparent screens
Usually, the opacity of the screen is `LV_OPA_COVER` to provide a solid background for its children. If this is not the case (opacity < 100%) the display's `bottom_layer` be visible.
Usually, the opacity of the screen is `LV_OPA_COVER` to provide a solid background for its children. If this is not the case (opacity < 100%) the display's `bottom_layer` will be visible.
If the bottom layer's opacity is also not `LV_OPA_COVER` LVGL has no solid background to draw.
This configuration (transparent screen and display) could be used to create for example OSD menus where a video is played on a lower layer, and a menu is overlaid on an upper layer.
@ -66,8 +66,7 @@ To properly render the screen the display's color format needs to be set to one
In summary, to enable transparent screens and displays for OSD menu-like UIs:
- Set the screen's `bg_opa` to transparent: `lv_obj_set_style_local_bg_opa(lv_scr_act(), LV_OPA_TRANSP, 0)`
- Set the bottom layer's `bg_opa` to transparent: `lv_obj_set_style_local_bg_opa(lv_scr_act(), LV_OPA_TRANSP, 0)`
- Set the screen's bg_opa to 0: `lv_obj_set_style_local_bg_opa(lv_layer_bottom(), LV_OPA_TRANSP, 0)`
- Set the bottom layer's `bg_opa` to transparent: `lv_obj_set_style_local_bg_opa(lv_bottom_layer(), LV_OPA_TRANSP, 0)`
- Set a color format with alpha channel. E.g. `lv_disp_set_color_format(disp, LV_COLOR_FORMAT_NATIVE_ALPHA)`
## Features of displays