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chore: update ROADMAP
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Gabor Kiss-Vamosi
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docs/ROADMAP.md
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docs/ROADMAP.md
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# Roadmap
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This is a summary for planned new features and a collection of ideas.
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This list indicates only the current intention and it can be changed.
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## Plannel for v9
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## v8.2
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See [#2790](https://github.com/lvgl/lvgl/issues/2790)
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### Naming and API
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- [ ] `lv_style_set_size()` should have separate width and height parameters
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- [ ] `lv_img_set_src()` use "type-aware" parameter. See [here](https://github.com/lvgl/lvgl/tree/arch/img-decode-rework)
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- [ ] Rename `LV_IMG_CF_TRUE_COLOR_*` to `LV_IMG_CF_RGB/RGBA`etc
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- [ ] `angle` ->`rotation`, `zoom` -> `scale`
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- [ ] More consistent names:`remove/clear/delete/del`, `offset/ofs`, `add/create/register`, `id/idx/index`, `middle/mid/center`, `img/image`, `txt/text`, `opa/alpha`, `scr/screen`
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- [ ] Reconsider the use of `has`, `is`, `enable` "action" keywords
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- [ ] Update canvas API (https://github.com/lvgl/lvgl/issues/3393)
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- [ ] `LV_STYLE_PROP_INHERIT` -> `LV_STYLE_PROP_FLAG_INHERITABLE` [LINK](https://github.com/lvgl/lvgl/pull/3390#discussion_r885915769)
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- [ ] Replace `disp_drv->direct_mode/full_refresh` with enum.
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### Architecture
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- [ ] Consider merging `lv_disp_t`, `lv_disp_drv_t`, `lv_disp_draw_buf_t`, `lv_draw_ctx_t`, and `struct`s from the new driver API (or only some of them)
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- [ ] Better way to reset global variables in `lv_deinit()` #3385
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- [ ] New driver architecture #2720
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- [ ] `buffer_post_process_cb`? See [here](https://github.com/lvgl/lvgl/issues/3379#issuecomment-1147954592). Also remove 16 SWAPPED color format? See [here](https://github.com/lvgl/lvgl/issues/3379#issuecomment-1140886258).
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- [ ] Reconsider masks. There should be a generic high level mask API whic is independent of the drawing engine.
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- [ ] `get_glyph_bitmap` should return an a8 bitmap that can be blended immediately.
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- [ ] Reconsider how themes should work. See [here](https://github.com/lvgl/lvgl/pull/3390#pullrequestreview-990710921).
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- [ ] Consider to prepare LVGL to render independent areas in parallel.
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- [ ] Introduce a pipeline in renderer to support multi-GPUs/Accelerators, such as 2D-capable-DMAs, 2D GPUs, dedicated processor cores for 2D tasks etc.
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- [ ] More conscious `<std*.h>` wrapper API
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- [ ] Drop `lv_mem_buf_get` as tlsf should be fast enough for normal allocations too. Fragmentation is also lower if processes can completely clean up after themselves.
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- [ ] Use `(u)int32_t` in API where possible. Consider hardcoding `lv_coord_t` as `int32_t`.
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- [ ] `lv_array`: replace linked lists with array where possible (arrays are faster and uses less memory)
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- [ ] Reconsider how to handle UTF-8 characters (allow different encoding too) and Bidi. Maybe create an abstraction for typesetting.
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- [ ] Generic `lv_data_t` and `lv_time_t`?
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- [ ] Update the `lv_img_dsc_t` to support images larger than 2048x2048
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- [ ] More color formats: 24 bit, ARGB1555, etc
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### Styles
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- [ ] Make `style_bg_img` support `9patch` images
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- [ ] non-uniform scale of images: scale width and height differently
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### Widgets
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- [ ] `lv_img`: Reconsider image sizing models (when the image size is not content): center, top-left, zoom, tile, other?
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- [ ] `lv_tabview` Replace button matrix with real buttons for more flexibility
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- [ ] `lv_label` reconsider label long modes
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- [ ] Improve `lv_label_align_t` #1656
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### Drawing and rendering
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- [ ] Allow selecting between the layered (new) and not layered (old) rendering.
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### Animations
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- [ ] Consider `anim` events to replace many callbacks with one
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- [ ] `lv_anim_time_to_speed` should work differently to remove `style_anim_speed`. E.g. on large values of anim time store the speed. Besides all widgets should use the `style_anim` property. `anim` should clamp the time if it's calculated from speed, e.g `lv_clamp(200, t, 2000)`. (maybe `a->min_time/max_time`).
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- [ ] Consider [stagger animations](https://greensock.com/docs/v3/Staggers).
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## Planned in general
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### CI
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- [ ] Plaform independent bechmarking # 3443
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- [ ] Run static analyzer
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- [ ] Release script
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- [ ] Unit test for all widgets #2337
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- [ ] CI test for flash/RAM usage #3127
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### Architecture
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- [ ] C++ binding: https://github.com/lvgl/lv_binding_cpp
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- [ ] Markup language #2428
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### Styles
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- [ ] Hover
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### Drawing and rendering
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- [ ] Different radius on each corner #2800
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- [ ] gradient to border/outline/shadow
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- [ ] multiple shadow/border
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- [ ] perspective
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- [ ] text shadow
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- [ ] innter shadow
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- [ ] ARGB image stroke/grow on the alpha map
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- [ ] real time blur
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- [ ] gradient with alpha
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### Others
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- [ ] More grid features. E.g. repeat(auto-fill, minmax( <value> px, 1fr))
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- [ ] Scene support. See [this comment](https://github.com/lvgl/lvgl/issues/2790#issuecomment-965100911)
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- [ ] Circle layout. #2871
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- [ ] Variable binding. I.e create properties which can be bound to objects and those obejcts are notified on value change. Maybe based on `lv_msg`?
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## Ideas
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- Reconsider color format management for run time color format setting, and custom color format usage. (Also [RGB888](https://github.com/lvgl/lvgl/issues/1722))
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- Make gradients more versatile
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- Image transformations matrix
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- Switch to RGBA colors in styles
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- Consider direct binary font format support
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- Simplify `group`s. Discussion is [here](https://forum.lvgl.io/t/lv-group-tabindex/2927/3).
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- Improve groups. [Discussion](https://forum.lvgl.io/t/lv-group-tabindex/2927/3). Reconsider focusing logic. Allow having no widget selected (on web it's possible)
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- lv_mem_alloc_aligned(size, align)
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- Text node. See [#1701](https://github.com/lvgl/lvgl/issues/1701#issuecomment-699479408)
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- CPP binding. See [Forum](https://forum.lvgl.io/t/is-it-possible-to-officially-support-optional-cpp-api/2736)
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- Optimize font decompression
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- Need static analyze (via coverity.io or something else)
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- Support dot_begin and dot_middle long modes for labels
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- Add new label alignment modes. [#1656](https://github.com/lvgl/lvgl/issues/1656)
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- Support larger images: [#1892](https://github.com/lvgl/lvgl/issues/1892)
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- Curved text on path
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- Variable binding improvements like Redux?
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- Speed up font decompression
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- Support larger images: add support for large image #1892
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- Functional programming support, pure view? See [here](https://www.freecodecamp.org/news/the-revolution-of-pure-views-aed339db7da4/)
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- Circle layout. See [#2871](https://github.com/lvgl/lvgl/issues/2871)
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- Style components. See [this comment](https://github.com/lvgl/lvgl/issues/2790#issuecomment-965100911)
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- SVG support: integrate an SVG render library
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- Support dot_begin and dot_middle long modes for labels
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- Allow matrix input for image transformation?
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- Radial/skew/conic gradient
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- Somehow let children inherit the parent's state
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- text on path
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