1 typedef struct	Memimage Memimage;
2 typedef struct	Memdata Memdata;
3 typedef struct	Memsubfont Memsubfont;
4 typedef struct	Memlayer Memlayer;
5 typedef struct	Memcmap Memcmap;
6 typedef struct	Memdrawparam	Memdrawparam;
7 
8 /*
9  * Memdata is allocated from main pool, but .data from the image pool.
10  * Memdata is allocated separately to permit patching its pointer after
11  * compaction when windows share the image data.
12  * The first word of data is a back pointer to the Memdata, to find
13  * The word to patch.
14  */
15 
16 struct Memdata
17 {
18 	u32int	*base;	/* allocated data pointer */
19 	uchar	*bdata;	/* pointer to first byte of actual data; word-aligned */
20 	int	ref;	/* number of Memimages using this data */
21 	void*	imref;
22 	int	allocd;	/* is this malloc'd? */
23 };
24 
25 enum {
26 	Frepl	= 1<<0,	/* is replicated */
27 	Fsimple	= 1<<1,	/* is 1x1 */
28 	Fgrey	= 1<<2,	/* is grey */
29 	Falpha	= 1<<3,	/* has explicit alpha */
30 	Fcmap	= 1<<4,	/* has cmap channel */
31 	Fbytes	= 1<<5,	/* has only 8-bit channels */
32 };
33 
34 struct Memimage
35 {
36 	Rectangle	r;	/* rectangle in data area, local coords */
37 	Rectangle	clipr;	/* clipping region */
38 	int		depth;	/* number of bits of storage per pixel */
39 	int		nchan;	/* number of channels */
40 	u32int		chan;	/* channel descriptions */
41 	Memcmap		*cmap;
42 
43 	Memdata		*data;	/* pointer to data; shared by windows in this image */
44 	int		zero;	/* data->bdata+zero==&byte containing (0,0) */
45 	u32int		width;	/* width in words of a single scan line */
46 	Memlayer	*layer;	/* nil if not a layer*/
47 	u32int		flags;
48 	void		*X;
49 	int		screenref;	/* reference count if this is a screen */
50 
51 	int		shift[NChan];
52 	int		mask[NChan];
53 	int		nbits[NChan];
54 };
55 
56 struct Memcmap
57 {
58 	uchar	cmap2rgb[3*256];
59 	uchar	rgb2cmap[16*16*16];
60 };
61 
62 /*
63  * Subfonts
64  *
65  * given char c, Subfont *f, Fontchar *i, and Point p, one says
66  *	i = f->info+c;
67  *	draw(b, Rect(p.x+i->left, p.y+i->top,
68  *		p.x+i->left+((i+1)->x-i->x), p.y+i->bottom),
69  *		color, f->bits, Pt(i->x, i->top));
70  *	p.x += i->width;
71  * to draw characters in the specified color (itself a Memimage) in Memimage b.
72  */
73 
74 struct	Memsubfont
75 {
76 	char		*name;
77 	short		n;		/* number of chars in font */
78 	uchar		height;		/* height of bitmap */
79 	char		ascent;		/* top of bitmap to baseline */
80 	Fontchar	*info;		/* n+1 character descriptors */
81 	Memimage	*bits;		/* of font */
82 };
83 
84 /*
85  * Encapsulated parameters and information for sub-draw routines.
86  */
87 enum {
88 	Simplesrc=1<<0,
89 	Simplemask=1<<1,
90 	Replsrc=1<<2,
91 	Replmask=1<<3,
92 	Fullmask=1<<4,
93 };
94 struct	Memdrawparam
95 {
96 	Memimage *dst;
97 	Rectangle	r;
98 	Memimage *src;
99 	Rectangle sr;
100 	Memimage *mask;
101 	Rectangle mr;
102 	int op;
103 
104 	u32int state;
105 	u32int mval;	/* if Simplemask, the mask pixel in mask format */
106 	u32int mrgba;	/* mval in rgba */
107 	u32int sval;	/* if Simplesrc, the source pixel in src format */
108 	u32int srgba;	/* sval in rgba */
109 	u32int sdval;	/* sval in dst format */
110 };
111 
112 /*
113  * Memimage management
114  */
115 
116 extern Memimage*	allocmemimage(Rectangle, u32int);
117 extern Memimage*	allocmemimaged(Rectangle, u32int, Memdata*, void*);
118 extern Memimage*	readmemimage(int);
119 extern Memimage*	creadmemimage(int);
120 extern int		writememimage(int, Memimage*);
121 extern void		freememimage(Memimage*);
122 extern int		loadmemimage(Memimage*, Rectangle, uchar*, int);
123 extern int		cloadmemimage(Memimage*, Rectangle, uchar*, int);
124 extern int		unloadmemimage(Memimage*, Rectangle, uchar*, int);
125 extern u32int*		wordaddr(Memimage*, Point);
126 extern uchar*		byteaddr(Memimage*, Point);
127 extern int		drawclip(Memimage*, Rectangle*, Memimage*, Point*,
128 				Memimage*, Point*, Rectangle*, Rectangle*);
129 extern void		memfillcolor(Memimage*, u32int);
130 extern int		memsetchan(Memimage*, u32int);
131 extern u32int		pixelbits(Memimage*, Point);
132 
133 /*
134  * Graphics
135  */
136 extern void	memdraw(Memimage*, Rectangle, Memimage*, Point, 
137 			Memimage*, Point, int);
138 extern void	memline(Memimage*, Point, Point, int, int, int,
139 			Memimage*, Point, int);
140 extern void	mempoly(Memimage*, Point*, int, int, int, int,
141 			Memimage*, Point, int);
142 extern void	memfillpoly(Memimage*, Point*, int, int,
143 			Memimage*, Point, int);
144 extern void	_memfillpolysc(Memimage*, Point*, int, int,
145 			Memimage*, Point, int, int, int, int);
146 extern void	memimagedraw(Memimage*, Rectangle, Memimage*, Point,
147 			Memimage*, Point, int);
148 extern int	hwdraw(Memdrawparam*);
149 extern void	memimageline(Memimage*, Point, Point, int, int, int,
150 			Memimage*, Point, int);
151 extern void	_memimageline(Memimage*, Point, Point, int, int, int,
152 			Memimage*, Point, Rectangle, int);
153 extern Point	memimagestring(Memimage*, Point, Memimage*, Point,
154 			Memsubfont*, char*);
155 extern void	memellipse(Memimage*, Point, int, int, int,
156 			Memimage*, Point, int);
157 extern void	memarc(Memimage*, Point, int, int, int, Memimage*,
158 			Point, int, int, int);
159 extern Rectangle memlinebbox(Point, Point, int, int, int);
160 extern int	memlineendsize(int);
161 extern void	_memmkcmap(void);
162 extern void	memimageinit(void);
163 
164 /*
165  * Subfont management
166  */
167 extern Memsubfont*	allocmemsubfont(char*, int, int, int, Fontchar*, Memimage*);
168 extern Memsubfont*	openmemsubfont(char*);
169 extern void		freememsubfont(Memsubfont*);
170 extern Point		memsubfontwidth(Memsubfont*, char*);
171 extern Memsubfont*	getmemdefont(void);
172 
173 /*
174  * Predefined 
175  */
176 extern	Memimage*	memwhite;
177 extern	Memimage*	memblack;
178 extern	Memimage*	memopaque;
179 extern	Memimage*	memtransparent;
180 extern	Memcmap*	memdefcmap;
181 
182 /*
183  * Kernel interface
184  */
185 void			memimagemove(void*, void*);
186 
187 /*
188  * Kernel cruft
189  */
190 extern void		rdb(void);
191 extern int		iprint(char*, ...);
192 extern int		drawdebug;
193 
194 /*
195  * For other implementations, like x11.
196  */
197 extern void		_memfillcolor(Memimage*, u32int);
198 extern Memimage*	_allocmemimage(Rectangle, u32int);
199 extern int		_cloadmemimage(Memimage*, Rectangle, uchar*, int);
200 extern int		_loadmemimage(Memimage*, Rectangle, uchar*, int);
201 extern void		_freememimage(Memimage*);
202 extern u32int		_rgbatoimg(Memimage*, u32int);
203 extern u32int		_imgtorgba(Memimage*, u32int);
204 extern u32int		_pixelbits(Memimage*, Point);
205 extern int		_unloadmemimage(Memimage*, Rectangle, uchar*, int);
206 extern Memdrawparam*	_memimagedrawsetup(Memimage*,
207 				Rectangle, Memimage*, Point, Memimage*,
208 				Point, int);
209 extern void		_memimagedraw(Memdrawparam*);
210 extern void		_drawreplacescreenimage(Memimage*);