Roadmap

Planned for v9

Naming and API

  • [x] lv_style_set_size() should have separate width and height parameters

  • [ ] lv_img_set_src() use "type-aware" parameter. See here

  • [ ] Reconsider image color formats.

  • [ ] More consistent names:remove/clear/delete/del, offset/ofs, add/create/register, id/idx/index, middle/mid/center, img/image, txt/text, opa/opacity/alpha, scr/screen, disp, display, finished/complete/completed/ready, buf/buffer, ..._cb, angle, rotation, zoom, scale`

  • [ ] Reconsider the use of has, is, enable "action" keywords

  • [ ] Update canvas API (https://github.com/lvgl/lvgl/issues/3393)

  • [x] LV_STYLE_PROP_INHERIT -> LV_STYLE_PROP_FLAG_INHERITABLE LINK

  • [ ] Replace disp_drv->direct_mode/full_refresh with enum.

  • [x] Consider flat directory structure. E.g. extra/widgets to widgets

  • [ ] Rename disp_drv->monitor_cb to render_completed/finished/ready

Architecture

  • [ ] Consider merging lv_disp_t, lv_disp_drv_t, lv_disp_draw_buf_t, lv_draw_ctx_t, and structs from the new driver API (or only some of them)

  • [ ] Better way to reset global variables in lv_deinit() #3385

  • [ ] New driver architecture #2720

  • [x] draw_ctx->buffer_convert? See here. Also remove 16 SWAPPED color format? See here.

  • [ ] Reconsider masks. There should be a generic high level mask API whic is independent of the drawing engine.

  • [ ] get_glyph_bitmap should return an a8 bitmap that can be blended immediately.

  • [ ] Reconsider how themes should work. See here.

  • [ ] Consider to prepare LVGL to render independent areas in parallel.

  • [ ] Introduce a pipeline in renderer to support multi-GPUs/Accelerators, such as 2D-capable-DMAs, 2D GPUs, dedicated processor cores for 2D tasks etc.

  • [x] More conscious <std*.h> wrapper API

  • [x] 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.

  • [ ] Use (u)int32_t in API where possible. Consider hardcoding lv_coord_t as int32_t.

  • [ ] lv_array: replace linked lists with array where possible (arrays are faster and uses less memory)

  • [ ] Reconsider how to handle UTF-8 characters (allow different encoding too) and Bidi. Maybe create an abstraction for typesetting.

  • [ ] Generic lv_date_t and lv_time_t?

  • [ ] Update the lv_img_dsc_t to support images larger than 2048x2048

  • [ ] More color formats: 24 bit, ARGB1555, ARGB4444 etc

  • [ ] Unified caching #3116 #3415

  • [ ] Make layouts with an lv_layout_dsc_t instead of registering an ID+callback. See here

Styles

  • [ ] Make style_bg_img support 9patch images

  • [ ] non-uniform scale of images: scale width and height differently

Widgets

  • [ ] lv_img: Reconsider image sizing models (when the image size is not content): center, top-left, zoom, tile, other?

  • [ ] lv_tabview Replace button matrix with real buttons for more flexibility

  • [ ] lv_label reconsider label long modes. (support min/max-width/height too) #3420

  • [ ] Improve lv_label_align_t #1656

Drawing and rendering

  • [ ] Allow selecting between the layered (new) and not layered (old) rendering.

Animations

  • [ ] Consider anim events to replace many callbacks with one

  • [ ] 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).

Planned in general

CI

  • [ ] Plaform independent bechmarking # 3443

  • [ ] Run static analyzer

  • [ ] Release script

  • [ ] Unit test for all widgets #2337

  • [ ] CI test for flash/RAM usage #3127

Architecture

  • [ ] C++ binding: https://github.com/lvgl/lv_binding_cpp

  • [ ] Markup language #2428

Styles

  • [ ] Hover

Drawing and rendering

  • [ ] Different radius on each corner #2800

  • [ ] gradient to border/outline/shadow

  • [ ] multiple shadow/border

  • [ ] perspective

  • [ ] text shadow

  • [ ] innter shadow

  • [ ] ARGB image stroke/grow on the alpha map

  • [ ] real time blur

  • [ ] gradient with alpha

Others

  • [ ] More grid features. E.g. repeat(auto-fill, minmax( px, 1fr))

  • [ ] Scene support. See this comment

  • [ ] Circle layout. #2871

  • [ ] 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?

  • [ ] Consider stagger animations.

Ideas

  • Consider direct binary font format support

  • Improve groups. Discussion. Reconsider focusing logic. Allow having no widget selected (on web it's possible)

  • lv_mem_alloc_aligned(size, align)

  • Speed up font decompression

  • Support larger images: add support for large image #1892

  • Functional programming support, pure view? See here

  • Style components. See this comment

  • SVG support: integrate an SVG render library

  • Support dot_begin and dot_middle long modes for labels

  • Allow matrix input for image transformation?

  • Radial/skew/conic gradient

  • Somehow let children inherit the parent's state

  • text on path