How to fill data in lv_img_dsc_t

General discussion
1

Hello,

I have a lv_img_dsc_t data_img, which is allocate with the function lv_img_buf_alloc.

How should I fill the data_img.data element ?

I saw it is a const uint8_t * and I don’t understand how to modify the pixel in that element.

2

The field names are pretty self-descriptive. E.g.


lv_img_dsc_t image = {
  .header.always_zero = 0,
  .header.w = 100,
  .header.h = 100,
  .data_size = 10000 * LV_IMG_PX_SIZE_ALPHA_BYTE,
  .header.cf = LV_IMG_CF_TRUE_COLOR_ALPHA,
  .data = image_data,
};

image_data doesn’t have to be const. E.g. you can do this:

lv_color_t image_data[] = {...};
lv_img_dsc_t image = {
  .header.always_zero = 0,
  .header.w = 100,
  .header.h = 100,
  .data_size = 10000 * LV_IMG_PX_SIZE_ALPHA_BYTE,
  .header.cf = LV_IMG_CF_TRUE_COLOR_ALPHA,
  .data = (const uint8_t *)image_data,
};
3

Thank you for the answer, I suppose it is the same logic when I use lv_img_dsc_t* ?

4

Yes, it is.