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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 UINT32 *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 UINT32 *palette);
png_error mng_capture_stop(core_file *fp);
#endif /* __PNG_H__ */
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