error: expected primary-expression before ‘.’ token when compiling as C++

[MorsMortium]

https://forum.lvgl.io/t/using-images-in-lvgl-getting-error-expected-primary-expression-before-token/4983

This issue occured to me, when using the converter and then compiling the resulting code in a c++ project. The solution is written in the post too:

If you put the fields in the exact order as they are defined in the structs it should also work in cpp:

const lv_img_dsc_t SoS_Skull = {
.header.cf = LV_IMG_CF_RAW_ALPHA,
.header.always_zero = 0,
.header.reserved = 0,
.header.w = 191,
.header.h = 237,
.data_size = 11505,
.data = SoS_Skull_map,
};

Could the converter order the fields this way?

[MorsMortium]

After some testing, I've found two different orderings, that worked:

const lv_img_dsc_t Window = {
  .header = {
    .cf = LV_IMG_CF_TRUE_COLOR,
    .always_zero = 0,
    .reserved = 2,
    .w = 240,
    .h = 240,
  },
  .data_size = 57600 * LV_COLOR_SIZE / 8,
  .data = Window_map,
};

and

const lv_img_dsc_t Window = {
  {
    LV_IMG_CF_TRUE_COLOR,
    0,
    2,
    240,
    240,
  },
  57600 * LV_COLOR_SIZE / 8,
  Window_map,
};

The order matters, for both of them. If this isn't desirable for the default behaviour, it could be set with some flag