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SourceVuESP-IDF Framework and Examplesi80_controller samplelv_canvas_set_buffer()

lv_canvas_set_buffer() function

Set a buffer for the canvas. Use lv_canvas_set_draw_buf() instead if you need to set a buffer with alignment requirement.

Syntax

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Summary

Declaration

Definition

from lv_canvas.h:62

void lv_canvas_set_buffer(lv_obj_t * obj, void * buf, int32_t w, int32_t h, lv_color_format_t cf);

Implemented in lv_canvas.c:71

Arguments

Argument

Description

obj

pointer to a canvas object

buf

buffer where content of canvas will be. The required size is (lv_image_color_format_get_px_size(cf) * w) / 8 * h) It can be allocated with `lv_malloc()` or it can be statically allocated array (e.g. static lv_color_t buf[100*50]) or it can be an address in RAM or external SRAM

w

width of canvas

h

height of canvas

cf

color format. `LV_COLOR_FORMAT...`

References

Code

Location

Referrer

voi lv_canvas_set_buffer(lv_obj_ obj voi buf int32_ w int32_ h lv_color_format_ cf

void lv_canvas_set_buffer(lv_obj_t * obj, void * buf, int32_t w, int32_t h, lv_color_format_t cf);

lv_canvas_set_buffer(canvas, cbuf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);

lv_example_canvas_6.c:17

lv_example_canvas_6()

Call Tree

lv_canvas_set_buffer() is called by 1 function and calls 5 functions:

lv_example_canvas_6()

lv_canvas_set_buffer()

lv_draw_buf_width_to_stride()

lv_draw_buf_init()

lv_image_cache_drop()

lv_image_get_src()

lv_image_set_src()

Data Use

lv_canvas_set_buffer() reads 1 variable and writes 1 variable:

lv_canvas_t::draw_buf

lv_canvas_set_buffer()

lv_canvas_t::draw_buf

Class Tree

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Override Tree

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Instances

Lifecycle

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