godot/thirdparty/basis_universal/encoder/pvpngreader.h

// pngreader.h - Public Domain - see unlicense at bottom of pvpngreader.cpp
#pragma once
#include <stdint.h>

namespace pv_png
{
	// PNG color types
	enum
	{ … };

	// PNG file description
	struct png_info
	{ … };

	// Retrieved information about the PNG file.
	// Returns false on any errors.
	bool get_png_info(const void* pImage_buf, size_t buf_size, png_info& info);

	// Input parameters:
	// pImage_buf, buf_size - pointer to PNG image data
	// desired_chans - desired number of output channels. 0=auto, 1=grayscale, 2=grayscale alpha, 3=24bpp RGB, 4=32bpp RGBA
	//
	// Output parameters:
	// width, height - PNG image resolution
	// num_chans - actual number of channels in PNG, from [1,4] (factoring in transparency)
	//
	// Returns nullptr on any errors.
	void* load_png(const void* pImage_buf, size_t buf_size, uint32_t desired_chans, uint32_t &width, uint32_t &height, uint32_t& num_chans);
}