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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************

    png.h

    PNG file management.

***************************************************************************/

#pragma once

#ifndef __PNG_H__
#define __PNG_H__

#include "osdcore.h"
#include "bitmap.h"
#include "corefile.h"



/***************************************************************************
    CONSTANTS
***************************************************************************/

#define PNG_Signature       "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A"
#define MNG_Signature       "\x8A\x4D\x4E\x47\x0D\x0A\x1A\x0A"

/* Chunk names */
#define PNG_CN_IHDR         0x49484452L
#define PNG_CN_PLTE         0x504C5445L
#define PNG_CN_IDAT         0x49444154L
#define PNG_CN_IEND         0x49454E44L
#define PNG_CN_gAMA         0x67414D41L
#define PNG_CN_sBIT         0x73424954L
#define PNG_CN_cHRM         0x6348524DL
#define PNG_CN_tRNS         0x74524E53L
#define PNG_CN_bKGD         0x624B4744L
#define PNG_CN_hIST         0x68495354L
#define PNG_CN_tEXt         0x74455874L
#define PNG_CN_zTXt         0x7A545874L
#define PNG_CN_pHYs         0x70485973L
#define PNG_CN_oFFs         0x6F464673L
#define PNG_CN_tIME         0x74494D45L
#define PNG_CN_sCAL         0x7343414CL

/* MNG Chunk names */
#define MNG_CN_MHDR         0x4D484452L
#define MNG_CN_MEND         0x4D454E44L
#define MNG_CN_TERM         0x5445524DL
#define MNG_CN_BACK         0x4241434BL

/* Prediction filters */
#define PNG_PF_None         0
#define PNG_PF_Sub          1
#define PNG_PF_Up           2
#define PNG_PF_Average      3
#define PNG_PF_Paeth        4

/* Error types */
enum png_error
{
	PNGERR_NONE,
	PNGERR_OUT_OF_MEMORY,
	PNGERR_UNKNOWN_FILTER,
	PNGERR_FILE_ERROR,
	PNGERR_BAD_SIGNATURE,
	PNGERR_DECOMPRESS_ERROR,
	PNGERR_FILE_TRUNCATED,
	PNGERR_FILE_CORRUPT,
	PNGERR_UNKNOWN_CHUNK,
	PNGERR_COMPRESS_ERROR,
	PNGERR_UNSUPPORTED_FORMAT
};



/***************************************************************************
    TYPE DEFINITIONS
***************************************************************************/

struct png_text
{
	png_text *      next;
	const char *    keyword;        /* this is allocated */
	const char *    text;           /* this points to a part of keyword */
};


struct png_info
{
	UINT8 *         image;
	UINT32          width, height;
	UINT32          xres, yres;
	rectangle       screen;
	double          xscale, yscale;
	double          source_gamma;
	UINT32          resolution_unit;
	UINT8           bit_depth;
	UINT8           color_type;
	UINT8           compression_method;
	UINT8           filter_method;
	UINT8           interlace_method;

	UINT8 *         palette;
	UINT32          num_palette;

	UINT8 *         trans;
	UINT32          num_trans;

	png_text *      textlist;
};



/***************************************************************************
    FUNCTION PROTOTYPES
***************************************************************************/

void png_free(png_info *pnginfo);

png_error png_read_file(core_file *fp, png_info *pnginfo);
png_error png_read_bitmap(core_file *fp, bitmap_argb32 &bitmap);
png_error png_expand_buffer_8bit(png_info *p);

png_error png_add_text(png_info *pnginfo, const char *keyword, const char *text);
png_error png_write_bitmap(core_file *fp, png_info *info, bitmap_t &bitmap, int palette_length, const rgb_t *palette);

png_error mng_capture_start(core_file *fp, bitmap_t &bitmap, double rate);
png_error mng_capture_frame(core_file *fp, png_info *info, bitmap_t &bitmap, int palette_length, const rgb_t *palette);
png_error mng_capture_stop(core_file *fp);

#endif  /* __PNG_H__ */