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feat(disp): Enable rendering to display subsection (#2583)

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This change introduces new fields on `lv_disp_drv_t` that allow to
specify the size of the full display and the offset of the display
subsection that is being rendered to. The values are used to transform
the drawing area before calling `flush_cb` so that only the desired part
of the full display is being rendered to.

Relates to: lvgl/lv_drivers#166
This commit is contained in:
Johannes Marbach
2021-10-11 14:48:15 +02:00
committed by GitHub
parent 7658f98e86
commit d09f6bdea3
5 changed files with 83 additions and 1 deletions
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docs/porting/display.md
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@@ -69,6 +69,10 @@ LVGL might render the screen in multiple chunks and therefore call `flush_cb` mu
### Optional fields
There are some optional display driver data fields:
- `physical_hor_res` horizontal resolution of the full / physical display in pixels. Only set this when _not_ using the full screen (defaults to -1 / same as `hor_res`).
- `physical_ver_res` vertical resolution of the full / physical display in pixels. Only set this when _not_ using the full screen (defaults to -1 / same as `ver_res`).
- `offset_x` horizontal offset from the the full / physical display in pixels. Only set this when _not_ using the full screen (defaults to 0).
- `offset_y` vertical offset from the the full / physical display in pixels. Only set this when _not_ using the full screen (defaults to 0).
- `color_chroma_key` A color which will be drawn as transparent on chrome keyed images. Set to `LV_COLOR_CHROMA_KEY` from `lv_conf.h` by default.
- `anti_aliasing` use anti-aliasing (edge smoothing). Enabled by default if `LV_COLOR_DEPTH` is set to at least 16 in `lv_conf.h`.
- `rotated` and `sw_rotate` See the [Rotation](#rotation) section below.