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SourceVuESP-IDF Framework and Examplesi80_controller samplelv_image_decoder_get_area()

lv_image_decoder_get_area() function

Decode `full_area` pixels incrementally by calling in a loop. Set `decoded_area` to `LV_COORD_MIN` on first call.

Syntax

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Summary

Declaration

Definition

from lv_image_decoder.h:117

lv_result_t lv_image_decoder_get_area(lv_image_decoder_dsc_t * dsc, const lv_area_t * full_area, lv_area_t * decoded_area);

Implemented in lv_image_decoder.c:146

Arguments

Argument

Description

dsc

image decoder descriptor

full_area

input parameter. the full area to decode after enough subsequent calls

decoded_area

input+output parameter. set the values to `LV_COORD_MIN` for the first call and to reset decoding. the decoded area is stored here after each call.

Return value

LV_RESULT_OK: success; LV_RESULT_INVALID: an error occurred or there is nothing left to decode

References

Code

Location

Referrer

lv_result_t lv_image_decoder_get_area(lv_image_decoder_dsc_t * dsc, const lv_area_t * full_area,

lv_image_decoder.c:146

lv_result_t lv_image_decoder_get_area(lv_image_decoder_dsc_t * dsc, const lv_area_t * full_area,

lv_image_decoder.h:117

res = lv_image_decoder_get_area(decoder_dsc, &relative_full_area_to_decode, relative_decoded_area);

lv_draw_image.c:300

img_decode_and_draw()

Call Tree

lv_image_decoder_get_area() is called by 1 function and calls 1 function:

img_decode_and_draw()

lv_image_decoder_get_area()

lv_image_decoder_t::get_area_cb

Data Use

lv_image_decoder_get_area() reads 3 variables:

lv_result_t::LV_RESULT_INVALID

lv_image_decoder_t::get_area_cb

lv_image_decoder_dsc_t::decoder

lv_image_decoder_get_area()

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