png_write_IHDR 809 3rdparty/libpng/pngpriv.h PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, png_write_IHDR 50 3rdparty/libpng/pngwrite.c png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,