docs(disp): LV_COLOR_SCREEN_TRANSP remove dependency on LV_COLOR_DEPT…

…H_32 as transparency is supported across all color depths (#3556) * Kconfig - LV_COLOR_SCREEN_TRANSP remove dependency on LV_COLOR_DEPTH_32 as transparency is supported across all color depths * display.md - LV_COLOR_SCREEN_TRANSP remove mention of 32bpp requirement that is no longer necessary
lvgl · Aug 10, 2022 · f58dcd9 · f58dcd9
1 parent d59bba1
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diff --git a/Kconfig b/Kconfig
@@ -42,11 +42,9 @@ menu "LVGL configuration"
 
         config LV_COLOR_SCREEN_TRANSP
             bool "Enable more complex drawing routines to manage screens transparency."
-            depends on LV_COLOR_DEPTH_32
             help
                 Can be used if the UI is above another layer, e.g. an OSD menu or video player.
-                Requires `LV_COLOR_DEPTH = 32` colors and the screen's `bg_opa` should be set to
-                non LV_OPA_COVER value
+                The screen's `bg_opa` should be set to non LV_OPA_COVER value
 
         config LV_COLOR_MIX_ROUND_OFS
             int "Adjust color mix functions rounding"

diff --git a/docs/overview/display.md b/docs/overview/display.md
@@ -63,11 +63,10 @@ See the [Display background](#display-background) section for more details. If t
 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 overlayed on an upper layer.
 
 To handle transparent displays, special (slower) color mixing algorithms need to be used by LVGL so this feature needs to enabled with `LV_COLOR_SCREEN_TRANSP` in `lv_conf.h`.
-As this mode operates on the Alpha channel of the pixels `LV_COLOR_DEPTH = 32` is also required. The Alpha channel of 32-bit colors will be 0 where there are no objects and 255 where there are solid objects.
+The Alpha channel of 32-bit colors will be 0 where there are no objects and 255 where there are solid objects.
 
 In summary, to enable transparent screens and displays for OSD menu-like UIs:
 - Enable `LV_COLOR_SCREEN_TRANSP` in `lv_conf.h`
-- Be sure to use `LV_COLOR_DEPTH 32`
 - Set the screen's opacity to `LV_OPA_TRANSP` e.g. with `lv_obj_set_style_local_bg_opa(lv_scr_act(), LV_OBJMASK_PART_MAIN, LV_STATE_DEFAULT, LV_OPA_TRANSP)`
 - Set the display opacity to `LV_OPA_TRANSP` with `lv_disp_set_bg_opa(NULL, LV_OPA_TRANSP);`