#ifndef PNG_IO_H
#define PNG_IO_H

#include "common.h"

#include <png.h>

struct VFile;

enum {
	PNG_HEADER_BYTES = 8
};

png_structp PNGWriteOpen(struct VFile* source);
png_infop PNGWriteHeader(png_structp png, unsigned width, unsigned height);
bool PNGWritePixels(png_structp png, unsigned width, unsigned height, unsigned stride, void* pixels);
bool PNGWriteCustomChunk(png_structp png, const char* name, size_t size, void* data);
void PNGWriteClose(png_structp png, png_infop info);

typedef int (*ChunkHandler)(png_structp, png_unknown_chunkp);

bool isPNG(struct VFile* source);
png_structp PNGReadOpen(struct VFile* source, unsigned offset);
bool PNGInstallChunkHandler(png_structp png, void* context, ChunkHandler handler, const char* chunkName);
bool PNGReadHeader(png_structp png, png_infop info);
bool PNGReadPixels(png_structp png, png_infop info, void* pixels, unsigned width, unsigned height, unsigned stride);
bool PNGIgnorePixels(png_structp png, png_infop info);
bool PNGReadFooter(png_structp png, png_infop end);
void PNGReadClose(png_structp png, png_infop info, png_infop end);

#endif