libpng 1.5.10 error: dereferencing pointer to incomplete type
c, libpng
Solution
The `png_info` struct was removed from the `png.h` in 1.5.0 and now you should use this pointer with the `png_get_*` and `png_set_*` functions.
As specified in libpng manual:
The png_info structure is designed to provide information about the PNG file. At one time, the fields of png_info were intended to be directly accessible to the user. However, this tended to cause problems with applications using dynamically loaded libraries, and as a result a set of interface functions for png_info (the png_get_*() and png_set_*() functions) was developed, and direct access to the png_info fields was deprecated..
For example:
png_uint_32 height;
height = png_get_image_height( png_ptr, info_ptr);
Problem
``` png_read_info (png_ptr, info_ptr); { png_byte color_type = info_ptr->color_type; png_byte bit_depth = info_ptr->bit_depth; ... ``` For last 2 lines I get error: dereferencing pointer to incomplete type What's wrong? In libpng 1.4 this was always ok.