Missing structure definition?

[ChuckM]

This seems like it is likely operator error, when I include pngle.h I get a compile time error from the statement

type struct _pngle_t pngle_t;

In the Arduino environment, the esp32 compiler is complaining that struct _pngle_t isn't defined (which it isn't yet as it is defined in the C code).

[kikuchan]

Thank you for trying to use pngle!

Sorry for confusing, but it's intended.
typedef an incomplete type of struct is a common technique in C.
Such object cannot be instanciated directly.

Instead, please use a pointer to hold a pngle instance, like:
pngle_t *pngle = pngle_new();
and, shouldn't be like:
pngle_t pngle;
or something.

[jesserockz]

We would also love for a way to either get the size directly, or have a constant provided by the pngle library so we can allocate the memory ourselves. In our case, we are trying to allocate it in PSRAM on the ESP32 if it exists.

esphome/esphome#8354

Jesse