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SourceVuESP-IDF Framework and Examplesi80_controller samplelv_image_decoder_open()

lv_image_decoder_open() function

Open an image. Try the created image decoders one by one. Once one is able to open the image that decoder is saved in `dsc`

Syntax

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Summary

Declaration

Definition

from lv_image_decoder.h:107

lv_result_t lv_image_decoder_open(lv_image_decoder_dsc_t * dsc, const void * src, const lv_image_decoder_args_t * args);

Implemented in lv_image_decoder.c:92

Arguments

Argument

Description

dsc

describes a decoding session. Simply a pointer to an `lv_image_decoder_dsc_t` variable.

src

the image source. Can be 1) File name: E.g. "S:folder/img1.png" (The drivers needs to registered via `lv_fs_drv_register())`) 2) Variable: Pointer to an `lv_image_dsc_t` variable 3) Symbol: E.g. `LV_SYMBOL_OK`

args

args about how the image should be opened.

Return value

LV_RESULT_OK: opened the image. `dsc->decoded` and `dsc->header` are set. LV_RESULT_INVALID: none of the registered image decoders were able to open the image.

References

Code

Location

Referrer

lv_result_t lv_image_decoder_open(lv_image_decoder_dsc_t * dsc, const void * src, const lv_image_decoder_args_t * args)

lv_image_decoder.c:92

lv_result_t lv_image_decoder_open(lv_image_decoder_dsc_t * dsc, const void * src, const lv_image_decoder_args_t * args);

lv_image_decoder.h:107

lv_result_t res = lv_image_decoder_open(&decoder_dsc, draw_dsc->src, NULL);

lv_draw_image.c:172

lv_draw_image_normal_helper()

lv_result_t res = lv_image_decoder_open(&decoder_dsc, draw_dsc->src, NULL);

lv_draw_image.c:192

lv_draw_image_tiled_helper()

lv_result_t res = lv_image_decoder_open(&decoder_dsc, dsc->img_src, NULL);

lv_draw_sw_arc.c:132

lv_draw_sw_arc()

lv_result_ decoder_re lv_image_decoder_open(&mask_decoder_dsc draw_dsc->bitmap_mask_src NULL)

lv_draw_sw_img.c:246

img_draw_core()

Call Tree

lv_image_decoder_open() is called by 4 functions and calls 7 functions:

lv_draw_image_normal_helper()

lv_draw_image_tiled_helper()

lv_draw_sw_arc()

img_draw_core()

lv_image_decoder_open()

lv_draw_buf_flush_cache()

lv_image_src_get_type()

lv_image_cache_is_enabled()

lv_image_decoder_t::open_cb

image_decoder_get_info()

Data Use

lv_image_decoder_open() reads 8 variables and writes 5 variables:

lv_global_t::img_cache

lv_result_t::LV_RESULT_INVALID

lv_result_t::LV_RESULT_OK

lv_image_decoder_args_t::no_cache

lv_image_decoder_args_t::flush_cache

lv_image_decoder_dsc_t::decoder

lv_image_decoder_dsc_t::args

lv_image_decoder_dsc_t::decoded

lv_image_decoder_open()

lv_image_decoder_dsc_t::decoder

lv_image_decoder_dsc_t::args

lv_image_decoder_dsc_t::src

lv_image_decoder_dsc_t::src_type

lv_image_decoder_dsc_t::cache

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