draw.h

在x86平台上运行不可信任代码的sandbox。

typedef struct	Cachefont Cachefont;
typedef struct	Cacheinfo Cacheinfo;
typedef struct	Cachesubf Cachesubf;
typedef struct	Display Display;
typedef struct	Font Font;
typedef struct	Fontchar Fontchar;
typedef struct	Image Image;
typedef struct	Mouse Mouse;
typedef struct	Point Point;
typedef struct	Rectangle Rectangle;
typedef struct	RGB RGB;
typedef struct	Screen Screen;
typedef struct	Subfont Subfont;


extern	int	Rfmt(Fmt*);
extern	int	Pfmt(Fmt*);

enum
{
	DOpaque		= 0xFFFFFFFF,
	DTransparent	= 0x00000000,		/* only useful for allocimage, memfillcolor */
	DBlack		= 0x000000FF,
	DWhite		= 0xFFFFFFFF,
	DRed		= 0xFF0000FF,
	DGreen		= 0x00FF00FF,
	DBlue		= 0x0000FFFF,
	DCyan		= 0x00FFFFFF,
	DMagenta		= 0xFF00FFFF,
	DYellow		= 0xFFFF00FF,
	DPaleyellow	= 0xFFFFAAFF,
	DDarkyellow	= 0xEEEE9EFF,
	DDarkgreen	= 0x448844FF,
	DPalegreen	= 0xAAFFAAFF,
	DMedgreen	= 0x88CC88FF,
	DDarkblue	= 0x000055FF,
	DPalebluegreen= 0xAAFFFFFF,
	DPaleblue		= 0x0000BBFF,
	DBluegreen	= 0x008888FF,
	DGreygreen	= 0x55AAAAFF,
	DPalegreygreen	= 0x9EEEEEFF,
	DYellowgreen	= 0x99994CFF,
	DMedblue		= 0x000099FF,
	DGreyblue	= 0x005DBBFF,
	DPalegreyblue	= 0x4993DDFF,
	DPurpleblue	= 0x8888CCFF,

	DNotacolor	= 0xFFFFFF00,
	DNofill		= DNotacolor,
	
};

enum
{
	Displaybufsize	= 8000,
	ICOSSCALE	= 1024,
	Borderwidth =	4,
};

enum
{
	/* refresh methods */
	Refbackup	= 0,
	Refnone		= 1,
	Refmesg		= 2
};
#define	NOREFRESH	((void*)-1)

enum
{
	/* line ends */
	Endsquare	= 0,
	Enddisc		= 1,
	Endarrow	= 2,
	Endmask		= 0x1F
};

#define	ARROW(a, b, c)	(Endarrow|((a)<<5)|((b)<<14)|((c)<<23))

typedef enum
{
	/* Porter-Duff compositing operators */
	Clear	= 0,

	SinD	= 8,
	DinS	= 4,
	SoutD	= 2,
	DoutS	= 1,

	S		= SinD|SoutD,
	SoverD	= SinD|SoutD|DoutS,
	SatopD	= SinD|DoutS,
	SxorD	= SoutD|DoutS,

	D		= DinS|DoutS,
	DoverS	= DinS|DoutS|SoutD,
	DatopS	= DinS|SoutD,
	DxorS	= DoutS|SoutD,	/* == SxorD */

	Ncomp = 12,
} Drawop;

/*
 * image channel descriptors 
 */
enum {
	CRed = 0,
	CGreen,
	CBlue,
	CGrey,
	CAlpha,
	CMap,
	CIgnore,
	NChan,
};

#define __DC(type, nbits)	((((type)&15)<<4)|((nbits)&15))
#define CHAN1(a,b)	__DC(a,b)
#define CHAN2(a,b,c,d)	(CHAN1((a),(b))<<8|__DC((c),(d)))
#define CHAN3(a,b,c,d,e,f)	(CHAN2((a),(b),(c),(d))<<8|__DC((e),(f)))
#define CHAN4(a,b,c,d,e,f,g,h)	(CHAN3((a),(b),(c),(d),(e),(f))<<8|__DC((g),(h)))

#define NBITS(c) ((c)&15)
#define TYPE(c) (((c)>>4)&15)

enum {
	GREY1	= CHAN1(CGrey, 1),
	GREY2	= CHAN1(CGrey, 2),
	GREY4	= CHAN1(CGrey, 4),
	GREY8	= CHAN1(CGrey, 8),
	CMAP8	= CHAN1(CMap, 8),
	RGB15	= CHAN4(CIgnore, 1, CRed, 5, CGreen, 5, CBlue, 5),
	RGB16	= CHAN3(CRed, 5, CGreen, 6, CBlue, 5),
	RGB24	= CHAN3(CRed, 8, CGreen, 8, CBlue, 8),
	RGBA32	= CHAN4(CRed, 8, CGreen, 8, CBlue, 8, CAlpha, 8),
	ARGB32	= CHAN4(CAlpha, 8, CRed, 8, CGreen, 8, CBlue, 8),	/* stupid VGAs */
	XRGB32	= CHAN4(CIgnore, 8, CRed, 8, CGreen, 8, CBlue, 8),
	BGR24	= CHAN3(CBlue, 8, CGreen, 8, CRed, 8),
	ABGR32	= CHAN4(CAlpha, 8, CBlue, 8, CGreen, 8, CRed, 8),
	XBGR32	= CHAN4(CIgnore, 8, CBlue, 8, CGreen, 8, CRed, 8),
};

extern	char*	chantostr(char*, ulong);
extern	ulong	strtochan(char*);
extern	int		chantodepth(ulong);

struct	Point
{
	int	x;
	int	y;
};

struct Rectangle
{
	Point	min;
	Point	max;
};

typedef void	(*Reffn)(Image*, Rectangle, void*);

struct Screen
{
	int	id;		/* id of system-held Screen */
	Image	*image;		/* unused; for reference only */
	Image	*fill;		/* color to paint behind windows */
};

struct Display
{
	int		locking;	/*program is using lockdisplay */
	int		dirno;
	int		fd;
	int		reffd;
	int		ctlfd;
	int		imageid;
	int		local;
	void		(*error)(Display*, char*);
	char		*devdir;
	char		*windir;
	char		oldlabel[64];
	ulong		dataqid;
	Image		*white;
	Image		*black;
	Image		*opaque;
	Image		*transparent;
	Image		*image;
	uchar		*buf;
	int		bufsize;
	uchar		*bufp;
	Font		*defaultfont;
	Subfont		*defaultsubfont;
	Image		*windows;
	Image		*screenimage;
	int		_isnewdisplay;
};

struct Image
{
	Display		*display;	/* display holding data */
	int		id;		/* id of system-held Image */
	Rectangle	r;		/* rectangle in data area, local coords */
	Rectangle 	clipr;		/* clipping region */
	int		depth;		/* number of bits per pixel */
	ulong		chan;
	int		repl;		/* flag: data replicates to tile clipr */
	Screen		*screen;	/* 0 if not a window */
	Image		*next;	/* next in list of windows */
};

struct RGB
{
	ulong	red;
	ulong	green;
	ulong	blue;
};

/*
 * Subfonts
 *
 * given char c, Subfont *f, Fontchar *i, and Point p, one says
 *	i = f->info+c;
 *	draw(b, Rect(p.x+i->left, p.y+i->top,
 *		p.x+i->left+((i+1)->x-i->x), p.y+i->bottom),
 *		color, f->bits, Pt(i->x, i->top));
 *	p.x += i->width;
 * to draw characters in the specified color (itself an Image) in Image b.
 */

struct	Fontchar
{
	int		x;		/* left edge of bits */
	uchar		top;		/* first non-zero scan-line */
	uchar		bottom;		/* last non-zero scan-line + 1 */
	char		left;		/* offset of baseline */
	uchar		width;		/* width of baseline */
};

struct	Subfont
{
	char		*name;
	short		n;		/* number of chars in font */
	uchar		height;		/* height of image */
	char		ascent;		/* top of image to baseline */
	Fontchar 	*info;		/* n+1 character descriptors */
	Image		*bits;		/* of font */
	int		ref;
};

enum
{
	/* starting values */
	LOG2NFCACHE =	6,
	NFCACHE =	(1<<LOG2NFCACHE),	/* #chars cached */
	NFLOOK =	5,			/* #chars to scan in cache */
	NFSUBF =	2,			/* #subfonts to cache */
	/* max value */
	MAXFCACHE =	1024+NFLOOK,		/* upper limit */
	MAXSUBF =	50,			/* generous upper limit */