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SourceVuESP-IDF Framework and Examplesi80_controller samplelv_canvas_init_layer()

lv_canvas_init_layer() function

Initialize a layer to use LVGL's generic draw functions (lv_draw_rect/label/...) on the canvas. Needs to be usd in pair with `lv_canvas_finish_layer`.

Syntax

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Summary

Declaration

Definition

from lv_canvas.h:158

void lv_canvas_init_layer(lv_obj_t * canvas, lv_layer_t * layer);

Implemented in lv_canvas.c:370

Arguments

Argument

Description

canvas

pointer to a canvas

layer

pointer to a layer variable to initialize

References

Code

Location

Referrer

voi lv_canvas_init_layer(lv_obj_ obj lv_layer_ layer

lv_canvas.c:370

void lv_canvas_init_layer(lv_obj_t * canvas, lv_layer_t * layer);

lv_canvas.h:158

lv_canvas_init_layer(canvas, &layer);

lv_example_canvas_1.c:39

lv_example_canvas_1()

lv_canvas_init_layer(canvas, &layer);

lv_example_canvas_1.c:62

lv_example_canvas_1()

lv_canvas_init_layer(canvas, &layer);

lv_example_canvas_3.c:24

lv_example_canvas_3()

lv_canvas_init_layer(canvas, &layer);

lv_example_canvas_5.c:23

lv_example_canvas_5()

lv_canvas_init_layer(canvas, &layer);

lv_example_canvas_6.c:22

lv_example_canvas_6()

lv_canvas_init_layer(canvas, &layer);

lv_example_canvas_7.c:23

lv_example_canvas_7()

lv_canvas_init_layer(canvas, &layer);

lv_example_roller_3.c:13

generate_mask()

Call Tree

lv_canvas_init_layer() is called by 6 functions and calls 1 function:

lv_example_canvas_1()

lv_example_canvas_3()

lv_example_canvas_5()

lv_example_canvas_6()

lv_example_canvas_7()

generate_mask()

lv_canvas_init_layer()

Data Use

lv_canvas_init_layer() reads 4 variables and writes 5 variables:

lv_image_header_t::cf

lv_image_header_t::w

lv_image_header_t::h

lv_canvas_t::draw_buf

lv_canvas_init_layer()

lv_layer_t::draw_buf

lv_layer_t::buf_area

lv_layer_t::color_format

lv_layer_t::_clip_area

lv_layer_t::phy_clip_area

Class Tree

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Override Tree

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Implementations

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Instances

Lifecycle

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