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

    drawgfx.h

    Generic graphic functions.

    Copyright Nicola Salmoria and the MAME Team.
    Visit http://mamedev.org for licensing and usage restrictions.

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

#pragma once

#ifndef __DRAWGFX_H__
#define __DRAWGFX_H__

#include "mamecore.h"



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

#define MAX_GFX_PLANES			8
#define MAX_GFX_SIZE			64	/* misfitmame */
#define MAX_ABS_GFX_SIZE		1024

#define EXTENDED_XOFFS			{ 0 }
#define EXTENDED_YOFFS			{ 0 }

#define GFX_ELEMENT_PACKED		1	/* two 4bpp pixels are packed in one byte of gfxdata */
#define GFX_ELEMENT_DONT_FREE	2	/* gfxdata was not malloc()ed, so don't free it on exit */

#define GFX_RAW 				0x12345678
/* When planeoffset[0] is set to GFX_RAW, the gfx data is left as-is, with no conversion.
   No buffer is allocated for the decoded data, and gfxdata is set to point to the source
   data; therefore, you must not use ROMREGION_DISPOSE.
   xoffset[0] is an optional displacement (*8) from the beginning of the source data, while
   yoffset[0] is the line modulo (*8) and charincrement the char modulo (*8). They are *8
   for consistency with the usual behaviour, but the bottom 3 bits are not used.
   GFX_ELEMENT_PACKED is automatically set if planes is <= 4.

   This special mode can be used to save memory in games that require several different
   handlings of the same ROM data (e.g. metro.c can use both 4bpp and 8bpp tiles, and both
   8x8 and 16x16; cps.c has 8x8, 16x16 and 32x32 tiles all fetched from the same ROMs).
   Note, however, that performance will suffer in rotated games, since the gfx data will
   not be prerotated and will rely on GFX_SWAPXY.
*/

enum
{
	TRANSPARENCY_NONE,			/* opaque with remapping */
	TRANSPARENCY_PEN,			/* single pen transparency with remapping */
	TRANSPARENCY_PEN_RAW,		/* single pen transparency with no remapping */
	TRANSPARENCY_PENS,			/* multiple pen transparency with remapping */
	TRANSPARENCY_PEN_TABLE,		/* special pen remapping modes (see DRAWMODE_xxx below) with remapping */
	TRANSPARENCY_ALPHA,			/* single pen transparency, other pens alpha */
	TRANSPARENCY_ALPHARANGE,	/* single pen transparency, multiple pens alpha depending on array, see psikyosh.c */

	TRANSPARENCY_MODES			/* total number of modes; must be last */
};

enum
{
	DRAWMODE_NONE,
	DRAWMODE_SOURCE,
	DRAWMODE_SHADOW
};



/***************************************************************************
    MACROS
***************************************************************************/

/* map old fillbitmap to new shared bitmap_fill code */
#define fillbitmap(dest, pen, clip) bitmap_fill(dest, clip, pen)

/* these macros describe gfx_layouts in terms of fractions of a region */
/* they can be used for total, planeoffset, xoffset, yoffset */
#define RGN_FRAC(num,den)		(0x80000000 | (((num) & 0x0f) << 27) | (((den) & 0x0f) << 23))
#define IS_FRAC(offset)			((offset) & 0x80000000)
#define FRAC_NUM(offset)		(((offset) >> 27) & 0x0f)
#define FRAC_DEN(offset)		(((offset) >> 23) & 0x0f)
#define FRAC_OFFSET(offset)		((offset) & 0x007fffff)

/* these macros are useful in gfx_layouts */
#define STEP2(START,STEP)		(START),(START)+(STEP)
#define STEP4(START,STEP)		STEP2(START,STEP),STEP2((START)+2*(STEP),STEP)
#define STEP8(START,STEP)		STEP4(START,STEP),STEP4((START)+4*(STEP),STEP)
#define STEP16(START,STEP)		STEP8(START,STEP),STEP8((START)+8*(STEP),STEP)
#define STEP32(START,STEP)		STEP16(START,STEP),STEP16((START)+16*(STEP),STEP)

/* these macros are used for declaring gfx_decode_entry_entry info arrays. */
#define GFXDECODE_EXTERN( name ) extern const gfx_decode_entry gfxdecodeinfo_##name[]
#define GFXDECODE_START( name ) const gfx_decode_entry gfxdecodeinfo_##name[] = {
#define GFXDECODE_ENTRY(region,offset,layout,start,colors) { region, offset, &layout, start, colors, 0, 0 },
#define GFXDECODE_SCALE(region,offset,layout,start,colors,xscale,yscale) { region, offset, &layout, start, colors, xscale, yscale },
#define GFXDECODE_END { 0 } };

/* these macros are used for declaring gfx_layout structures. */
#define GFXLAYOUT_RAW( name, planes, width, height, linemod, charmod ) \
const gfx_layout name = { width, height, RGN_FRAC(1,1), planes, { GFX_RAW }, { 0 }, { linemod }, charmod };


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

typedef struct _gfx_layout gfx_layout;
struct _gfx_layout
{
	UINT16			width;				/* pixel width of each element */
	UINT16			height;				/* pixel height of each element */
	UINT32			total;				/* total number of elements, or RGN_FRAC() */
	UINT16			planes;				/* number of bitplanes */
	UINT32			planeoffset[MAX_GFX_PLANES]; /* bit offset of each bitplane */
	UINT32			xoffset[MAX_GFX_SIZE]; /* bit offset of each horizontal pixel */
	UINT32			yoffset[MAX_GFX_SIZE]; /* bit offset of each vertical pixel */
	UINT32			charincrement;		/* distance between two consecutive elements (in bits) */
	const UINT32 *	extxoffs;			/* extended X offset array for really big layouts */
	const UINT32 *	extyoffs;			/* extended Y offset array for really big layouts */
};


/* In mamecore.h: typedef struct _gfx_element gfx_element; */
struct _gfx_element
{
	UINT16			width;				/* pixel width of each element */
	UINT16			height;				/* pixel height of each element */
	UINT8			flags;				/* one of the GFX_ELEMENT_* flags above */
	UINT32 			total_elements;		/* total number of decoded elements */

	UINT32			color_base;			/* base color for rendering */
	UINT16			color_depth;		/* number of colors each pixel can represent */
	UINT16			color_granularity;	/* number of colors for each color code */
	UINT32			total_colors;		/* number of color codes */

	UINT32 *		pen_usage;			/* bitmask of pens that are used (pens 0-31 only) */

	UINT8 *			gfxdata;			/* pixel data, 8bpp or 4bpp (if GFX_ELEMENT_PACKED) */
	UINT32			line_modulo;		/* bytes between each row of data */
	UINT32			char_modulo;		/* bytes between each element */
	gfx_layout		layout;				/* copy of the original layout */
};


typedef struct _gfx_decode_entry gfx_decode_entry;
struct _gfx_decode_entry
{
	const char *	memory_region;		/* memory region where the data resides */
	UINT32 			start;				/* offset of beginning of data to decode */
	const gfx_layout *gfxlayout;		/* pointer to gfx_layout describing the layout; NULL marks the end of the array */
	UINT16 			color_codes_start;	/* offset in the color lookup table where color codes start */
	UINT16 			total_color_codes;	/* total number of color codes */
	UINT8 			xscale;				/* optional horizontal scaling factor; 0 means 1x */
	UINT8			yscale;				/* optional vertical scaling factor; 0 means 1x */
};


typedef struct _alpha_cache alpha_cache;
struct _alpha_cache
{
	int		alphas;
	int		alphad;
};



/***************************************************************************
    GLOBAL VARIABLES
***************************************************************************/

/* drawing mode case TRANSPARENCY_ALPHARANGE */
extern UINT8 gfx_alpharange_table[256];

/* drawing mode case TRANSPARENCY_PEN_TABLE */
extern UINT8 gfx_drawmode_table[256];

/* By default, when drawing sprites with pdrawgfx, shadows affect the sprites below them. */
/* Set this flag to 1 to make shadows only affect the background, leaving sprites at full brightness. */
extern int pdrawgfx_shadow_lowpri;



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

void drawgfx_init(running_machine *machine);


void decodechar(gfx_element *gfx,int num,const unsigned char *src);
gfx_element *allocgfx(const gfx_layout *gl);
void decodegfx(gfx_element *gfx, const UINT8 *src, UINT32 first, UINT32 count);
void freegfx(gfx_element *gfx);


void drawgfx(bitmap_t *dest,const gfx_element *gfx,
		unsigned int code,unsigned int color,int flipx,int flipy,int sx,int sy,
		const rectangle *clip,int transparency,int transparent_color);
void pdrawgfx(bitmap_t *dest,const gfx_element *gfx,
		unsigned int code,unsigned int color,int flipx,int flipy,int sx,int sy,
		const rectangle *clip,int transparency,int transparent_color,
		UINT32 priority_mask);
void mdrawgfx(bitmap_t *dest,const gfx_element *gfx,
		unsigned int code,unsigned int color,int flipx,int flipy,int sx,int sy,
		const rectangle *clip,int transparency,int transparent_color,
		UINT32 priority_mask);


void drawgfxzoom( bitmap_t *dest_bmp,const gfx_element *gfx,
		unsigned int code,unsigned int color,int flipx,int flipy,int sx,int sy,
		const rectangle *clip,int transparency,int transparent_color,int scalex,int scaley);
void pdrawgfxzoom( bitmap_t *dest_bmp,const gfx_element *gfx,
		unsigned int code,unsigned int color,int flipx,int flipy,int sx,int sy,
		const rectangle *clip,int transparency,int transparent_color,int scalex,int scaley,
		UINT32 priority_mask);
void mdrawgfxzoom( bitmap_t *dest_bmp,const gfx_element *gfx,
		unsigned int code,unsigned int color,int flipx,int flipy,int sx,int sy,
		const rectangle *clip,int transparency,int transparent_color,int scalex,int scaley,
		UINT32 priority_mask);


void draw_scanline8(bitmap_t *bitmap,int x,int y,int length,const UINT8 *src,const pen_t *pens,int transparent_pen);
void draw_scanline16(bitmap_t *bitmap,int x,int y,int length,const UINT16 *src,const pen_t *pens,int transparent_pen);
void draw_scanline32(bitmap_t *bitmap,int x,int y,int length,const UINT32 *src,const pen_t *pens,int transparent_pen);
void pdraw_scanline8(bitmap_t *bitmap,int x,int y,int length,const UINT8 *src,const pen_t *pens,int transparent_pen,int pri);
void pdraw_scanline16(bitmap_t *bitmap,int x,int y,int length,const UINT16 *src,const pen_t *pens,int transparent_pen,int pri);
void pdraw_scanline32(bitmap_t *bitmap,int x,int y,int length,const UINT32 *src,const pen_t *pens,int transparent_pen,int pri);
void extract_scanline8(bitmap_t *bitmap,int x,int y,int length,UINT8 *dst);
void extract_scanline16(bitmap_t *bitmap,int x,int y,int length,UINT16 *dst);
void extract_scanline32(bitmap_t *bitmap,int x,int y,int length,UINT32 *dst);


void copybitmap(bitmap_t *dest,bitmap_t *src,int flipx,int flipy,
				int sx,int sy,const rectangle *clip);

void copybitmap_trans(bitmap_t *dest,bitmap_t *src,int flipx,int flipy,
					  int sx,int sy,const rectangle *clip,pen_t transparent_pen);

void copyscrollbitmap(bitmap_t *dest,bitmap_t *src,
					  int rows,const int *rowscroll,int cols,const int *colscroll,
					  const rectangle *clip);

void copyscrollbitmap_trans(bitmap_t *dest,bitmap_t *src,
					 		int rows,const int *rowscroll,int cols,const int *colscroll,
					 		const rectangle *clip,pen_t transparent_pen);


/*
  Copy a bitmap applying rotation, zooming, and arbitrary distortion.
  This function works in a way that mimics some real hardware like the Konami
  051316, so it requires little or no further processing on the caller side.

  Two 16.16 fixed point counters are used to keep track of the position on
  the source bitmap. startx and starty are the initial values of those counters,
  indicating the source pixel that will be drawn at coordinates (0,0) in the
  destination bitmap. The destination bitmap is scanned left to right, top to
  bottom; every time the cursor moves one pixel to the right, incxx is added
  to startx and incxy is added to starty. Every time the cursor moves to the
  next line, incyx is added to startx and incyy is added to startyy.

  What this means is that if incxy and incyx are both 0, the bitmap will be
  copied with only zoom and no rotation. If e.g. incxx and incyy are both 0x8000,
  the source bitmap will be doubled.

  Rotation is performed this way:
  incxx = 0x10000 * cos(theta)
  incxy = 0x10000 * -sin(theta)
  incyx = 0x10000 * sin(theta)
  incyy = 0x10000 * cos(theta)
  this will perform a rotation around (0,0), you'll have to adjust startx and
  starty to move the center of rotation elsewhere.

  Optionally the bitmap can be tiled across the screen instead of doing a single
  copy. This is obtained by setting the wraparound parameter to true.
 */
void copyrozbitmap(bitmap_t *dest,bitmap_t *src,
		UINT32 startx,UINT32 starty,int incxx,int incxy,int incyx,int incyy,int wraparound,
		const rectangle *clip,int transparency,int transparent_color,UINT32 priority);



/***************************************************************************
    INLINE FUNCTIONS
***************************************************************************/

/* Alpha blending functions */
INLINE void alpha_set_level(int level)
{
	extern struct _alpha_cache drawgfx_alpha_cache;
	assert(level >= 0 && level <= 256);
	drawgfx_alpha_cache.alphas = level;
	drawgfx_alpha_cache.alphad = 256 - level;
}


INLINE UINT32 alpha_blend16(UINT32 d, UINT32 s)
{
	extern struct _alpha_cache drawgfx_alpha_cache;
	return ((((s & 0x001f) * drawgfx_alpha_cache.alphas + (d & 0x001f) * drawgfx_alpha_cache.alphad) >> 8)) |
		   ((((s & 0x03e0) * drawgfx_alpha_cache.alphas + (d & 0x03e0) * drawgfx_alpha_cache.alphad) >> 8) & 0x03e0) |
		   ((((s & 0x7c00) * drawgfx_alpha_cache.alphas + (d & 0x7c00) * drawgfx_alpha_cache.alphad) >> 8) & 0x7c00);
}


INLINE UINT32 alpha_blend32(UINT32 d, UINT32 s)
{
	extern struct _alpha_cache drawgfx_alpha_cache;
	return ((((s & 0x0000ff) * drawgfx_alpha_cache.alphas + (d & 0x0000ff) * drawgfx_alpha_cache.alphad) >> 8)) |
		   ((((s & 0x00ff00) * drawgfx_alpha_cache.alphas + (d & 0x00ff00) * drawgfx_alpha_cache.alphad) >> 8) & 0x00ff00) |
		   ((((s & 0xff0000) * drawgfx_alpha_cache.alphas + (d & 0xff0000) * drawgfx_alpha_cache.alphad) >> 8) & 0xff0000);
}


INLINE UINT32 alpha_blend_r16(UINT32 d, UINT32 s, UINT8 level)
{
	int alphad = 256 - level;
	return ((((s & 0x001f) * level + (d & 0x001f) * alphad) >> 8)) |
		   ((((s & 0x03e0) * level + (d & 0x03e0) * alphad) >> 8) & 0x03e0) |
		   ((((s & 0x7c00) * level + (d & 0x7c00) * alphad) >> 8) & 0x7c00);
}


INLINE UINT32 alpha_blend_r32( UINT32 d, UINT32 s, UINT8 level )
{
	int alphad = 256 - level;
	return ((((s & 0x0000ff) * level + (d & 0x0000ff) * alphad) >> 8)) |
		   ((((s & 0x00ff00) * level + (d & 0x00ff00) * alphad) >> 8) & 0x00ff00) |
		   ((((s & 0xff0000) * level + (d & 0xff0000) * alphad) >> 8) & 0xff0000);
}


#endif	/* __DRAWGFX_H__ */
