Lines Matching full:to
10 In LVGL, an *lv_display_t* (not to be confused with a :ref:`Screen <screens>`) is a
13 following for each display panel you want LVGL to use:
29 on demand. (You need to add your VNC driver.)
34 If you set up LVGL to use more than one display, be aware that some functions use the
50 it is representing, as well as other things relevant to its lifetime:
60 - The :ref:`draw_buffers` assigned to it
61 - The :ref:`flush_callback` function that moves pixels from :ref:`draw_buffers` to Display hardware
63 compute what to render during a :ref:`display refresh <basic_data_flow>`
73 facilitate layering are created and attached to it.
86 For the bottom layer to be visible, the Active Screen's background has to be
89 You can get pointers to each of these screens on the :ref:`default_display` by using
97 You can get pointers to each of these screens on a specified display by using
105 To set a Screen you create to be the :ref:`active_screen`, call
113 LVGL uses the Top Layer and System Layer two empower you to ensure that certain
116 You can add "pop-up windows" to the *Top Layer* freely. The Top Layer was meant to
117 be used to create Widgets that are visible on all Screens shown on a Display. But,
142 Similar to the Top- and System Layers, the Bottom Layer is also the full size of the
154 an event handler to a display.
156 If you added ``user_data`` to the Display, you can retrieve it in an event like this:
168 :cpp:expr:`lv_event_get_param(e)` returns a pointer to an :cpp:struct:`lv_area_t`
169 variable with the coordinates of the area to be invalidated. The area can
170 be freely modified if needed to adopt it the special requirement of the
171 display. Usually needed with monochrome displays to invalidate ``N x 8``
174 …LV_EVENT_REFR_START`: Sent when a refreshing cycle starts. Sent even if there is nothing to redraw.
181 to :cpp:func:`lv_display_set_resolution` or :cpp:func:`lv_display_set_rotation`.
196 To create a display for LVGL:
206 to help you manage layering of displayed Widgets. See :ref:`transparent_screens` and
215 other Display Objects are created (to service additional Display Panels), the Default
218 To set another :ref:`display` as the Default Display, call :cpp:func:`lv_display_set_default`.
223 cause the function to target the Default Display. Check the API documentation for
224 the function you are calling to be sure.
232 During system initialization, you must set drawing buffers for LVGL to use for each
239 - ``buf1`` a buffer to which LVGL can render pixels
244 - :cpp:enumerator:`LV_DISPLAY_RENDER_MODE_PARTIAL` Use the buffer(s) to render
245 to the display using buffers smaller than the size of the display. Use of
247 images needs to be copied to the given area of the display. In this mode if a
252 If two buffer are used, the rendered areas are automatically copied to the
253 other buffer after flushing. Due to this in :ref:`flush_callback` typically
254 only a frame buffer address needs to be changed. If a button is pressed
260 the :ref:`flush_callback` callback only has to update the address of the frame buffer to
279 that draw buffer and sends it to the display via the :ref:`flush_callback`. LVGL
281 (that is, the content of the buffer has been sent to the
288 of the other buffer is sent to the display in the background. DMA or
289 other hardware should be used to transfer data to the display so the MCU
291 display to become parallel operations.
299 Draw buffer(s) are simple array(s) that LVGL uses to render the display's
301 sent to the display using a Flush Callback function.
309 /* The most simple case (also the slowest) to send all rendered pixels to the
310 * screen one-by-one. `put_px` is just an example. It needs to be implemented by you. */
325 During system initialization, tell LVGL you want that function to copy pixels from
326 rendered pixel-buffers to a particular display by doing the following:
332 Note that which display is targeted is passed to the function, so you can use the
334 displays. It's up to you.
338 :cpp:expr:`lv_display_flush_ready(display1)` needs to be called when flushing is
339 complete to inform LVGL that the buffer is available again to render new content
343 Callback multiple times. To see whether the current call is for the last chunk being
355 To set the resolution of the display after creation use
358 It's not mandatory to use the whole display for LVGL, however in some
360 still sees the whole resolution and the values needs to be converted to
375 or anything else to optimize waiting for the flush to be completed.
389 according to the set degree, however it will not perform the actual rotation.
391 emitted to allow for hardware reconfiguration. If your display panel and/or its
392 driver chip(s) do not support rotation, :cpp:func:`lv_draw_sw_rotate` can be used to
396 according to the current rotation settings of the display.
404 can be rotated on their own before flushing to the frame buffer.
407 :cpp:enumerator:`LV_DISPLAY_RENDER_MODE_PARTIAL` and the rotated image should be sent to a
412 /*Rotate a partially rendered area to another buffer and send it*/
426 /*Have a buffer to store the rotated area and perform the rotation*/
445 /*Rotate a partially rendered area to the frame buffer*/
478 The default color format of the display is set according to :c:macro:`LV_COLOR_DEPTH`
499 In case of RGB565 color format it might be required to swap the 2 bytes
502 The ideal solution is configure the hardware to handle the 16 bit data with different byte order,
504 can be called in the :ref:`flush_callback` to swap the bytes.
513 to
524 To enable it, set ``LV_COLOR_DEPTH 1`` or use :cpp:expr:`lv_display_set_color_format(display, LV_CO…
526 …R_FORMAT_I1` format assumes that bytes are mapped to rows (i.e., the bits of a byte are written ne…
543 Internally, LVGL rounds the redrawn areas to byte boundaries. Therefore, updated areas will:
549 This is necessary because LVGL reserves 2 x 4 bytes in the buffer, as these are assumed to be used …
551 To skip the palette, include the following line in your :ref:`flush_callback` function: ``px_map +=…
556 As LVGL can not handle fractional width make sure to round the horizontal resolution
557 to 8 bits (for example 90 to 96).
559 The :cpp:func:`lv_draw_sw_i1_convert_to_vtiled` function is used to convert a draw
560 buffer in I1 color format from a row-wise (htiled) to a column-wise (vtiled) buffer
563 are rounded to a multiple of 8. The bit order of the resulting vtiled buffer can be
566 For more details, refer to the implementation in
569 To ensure that the redrawn areas start and end on byte boundaries, you can add a
570 rounder callback to your display driver. This callback will round the width and
571 height to the nearest multiple of 8.
573 Here is an example of how to implement and set a rounder callback:
581 /* Round the height to the nearest multiple of 8 */
589 area to the nearest multiple of 8. The `x1` and `y1` coordinates are rounded down,
622 When multiple CPU cores are available and a large area needs to be redrawn, LVGL must identify inde…
626 Due to dependencies among different areas, CPU cores cannot always be fully utilized.
628 To address this, LVGL can divide large areas that need to be updated into smaller tiles. These tile…
646 …ER_MODE_DIRECT`, the screen-sized draw buffer is divided by the tile count to determine the ideal …
661 refreshing happen, for example to synchronize rendering with VSYNC or
671 /* Call this to refresh dirty (changed) areas of the display. */
674 If you have multiple displays call :cpp:expr:`lv_display_set_default(display1)` to
675 select the display to refresh before :cpp:expr:`_lv_display_refr_timer(NULL)`.
681 …he performance monitor is enabled, the value of :c:macro:`LV_DEF_REFR_PERIOD` needs to be set to be
682 consistent with the refresh period of the display to ensure that the statistical results are correc…
690 However, by using :cpp:expr:`lv_refr_now(display)` you can ask LVGL to redraw the
694 The parameter of :cpp:func:`lv_refr_now` is a display to refresh. If ``NULL`` is set
701 To mirror the image of a display to another display, you don't need to use
703 :ref:`flush_callback` to the other display as well.
712 1. setting the resolution of the displays to the large display's resolution;
714 3. send the buffer's content to each real display with the truncated area.
734 <indev_other_features>`) counts as an activity. To get time elapsed since the last
748 - :ref:`Drawing <draw>` to learn more about how rendering works in LVGL.