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 
50 	int		shift[NChan];
51 	int		mask[NChan];
52 	int		nbits[NChan];
53 };
54 
55 struct Memcmap
56 {
57 	uchar	cmap2rgb[3*256];
58 	uchar	rgb2cmap[16*16*16];
59 };
60 
61 /*
62  * Subfonts
63  *
64  * given char c, Subfont *f, Fontchar *i, and Point p, one says
65  *	i = f->info+c;
66  *	draw(b, Rect(p.x+i->left, p.y+i->top,
67  *		p.x+i->left+((i+1)->x-i->x), p.y+i->bottom),
68  *		color, f->bits, Pt(i->x, i->top));
69  *	p.x += i->width;
70  * to draw characters in the specified color (itself a Memimage) in Memimage b.
71  */
72 
73 struct	Memsubfont
74 {
75 	char		*name;
76 	short		n;		/* number of chars in font */
77 	uchar		height;		/* height of bitmap */
78 	char		ascent;		/* top of bitmap to baseline */
79 	Fontchar	*info;		/* n+1 character descriptors */
80 	Memimage	*bits;		/* of font */
81 };
82 
83 /*
84  * Encapsulated parameters and information for sub-draw routines.
85  */
86 enum {
87 	Simplesrc=1<<0,
88 	Simplemask=1<<1,
89 	Replsrc=1<<2,
90 	Replmask=1<<3,
91 	Fullmask=1<<4,
92 };
93 struct	Memdrawparam
94 {
95 	Memimage *dst;
96 	Rectangle	r;
97 	Memimage *src;
98 	Rectangle sr;
99 	Memimage *mask;
100 	Rectangle mr;
101 	int op;
102 
103 	u32int state;
104 	u32int mval;	/* if Simplemask, the mask pixel in mask format */
105 	u32int mrgba;	/* mval in rgba */
106 	u32int sval;	/* if Simplesrc, the source pixel in src format */
107 	u32int srgba;	/* sval in rgba */
108 	u32int sdval;	/* sval in dst format */
109 };
110 
111 /*
112  * Memimage management
113  */
114 
115 extern Memimage*	allocmemimage(Rectangle, u32int);
116 extern Memimage*	allocmemimaged(Rectangle, u32int, Memdata*, void*);
117 extern Memimage*	readmemimage(int);
118 extern Memimage*	creadmemimage(int);
119 extern int		writememimage(int, Memimage*);
120 extern void		freememimage(Memimage*);
121 extern int		loadmemimage(Memimage*, Rectangle, uchar*, int);
122 extern int		cloadmemimage(Memimage*, Rectangle, uchar*, int);
123 extern int		unloadmemimage(Memimage*, Rectangle, uchar*, int);
124 extern u32int*		wordaddr(Memimage*, Point);
125 extern uchar*		byteaddr(Memimage*, Point);
126 extern int		drawclip(Memimage*, Rectangle*, Memimage*, Point*,
127 				Memimage*, Point*, Rectangle*, Rectangle*);
128 extern void		memfillcolor(Memimage*, u32int);
129 extern int		memsetchan(Memimage*, u32int);
130 extern u32int		pixelbits(Memimage*, Point);
131 
132 /*
133  * Graphics
134  */
135 extern void	memdraw(Memimage*, Rectangle, Memimage*, Point, 
136 			Memimage*, Point, int);
137 extern void	memline(Memimage*, Point, Point, int, int, int,
138 			Memimage*, Point, int);
139 extern void	mempoly(Memimage*, Point*, int, int, int, int,
140 			Memimage*, Point, int);
141 extern void	memfillpoly(Memimage*, Point*, int, int,
142 			Memimage*, Point, int);
143 extern void	_memfillpolysc(Memimage*, Point*, int, int,
144 			Memimage*, Point, int, int, int, int);
145 extern void	memimagedraw(Memimage*, Rectangle, Memimage*, Point,
146 			Memimage*, Point, int);
147 extern int	hwdraw(Memdrawparam*);
148 extern void	memimageline(Memimage*, Point, Point, int, int, int,
149 			Memimage*, Point, int);
150 extern void	_memimageline(Memimage*, Point, Point, int, int, int,
151 			Memimage*, Point, Rectangle, int);
152 extern Point	memimagestring(Memimage*, Point, Memimage*, Point,
153 			Memsubfont*, char*);
154 extern void	memellipse(Memimage*, Point, int, int, int,
155 			Memimage*, Point, int);
156 extern void	memarc(Memimage*, Point, int, int, int, Memimage*,
157 			Point, int, int, int);
158 extern Rectangle memlinebbox(Point, Point, int, int, int);
159 extern int	memlineendsize(int);
160 extern void	_memmkcmap(void);
161 extern void	memimageinit(void);
162 
163 /*
164  * Subfont management
165  */
166 extern Memsubfont*	allocmemsubfont(char*, int, int, int, Fontchar*, Memimage*);
167 extern Memsubfont*	openmemsubfont(char*);
168 extern void		freememsubfont(Memsubfont*);
169 extern Point		memsubfontwidth(Memsubfont*, char*);
170 extern Memsubfont*	getmemdefont(void);
171 
172 /*
173  * Predefined 
174  */
175 extern	Memimage*	memwhite;
176 extern	Memimage*	memblack;
177 extern	Memimage*	memopaque;
178 extern	Memimage*	memtransparent;
179 extern	Memcmap*	memdefcmap;
180 
181 /*
182  * Kernel interface
183  */
184 void			memimagemove(void*, void*);
185 
186 /*
187  * Kernel cruft
188  */
189 extern void		rdb(void);
190 extern int		iprint(char*, ...);
191 extern int		drawdebug;
192 
193 /*
194  * For other implementations, like x11.
195  */
196 extern void		_memfillcolor(Memimage*, u32int);
197 extern Memimage*	_allocmemimage(Rectangle, u32int);
198 extern int		_cloadmemimage(Memimage*, Rectangle, uchar*, int);
199 extern int		_loadmemimage(Memimage*, Rectangle, uchar*, int);
200 extern void		_freememimage(Memimage*);
201 extern u32int		_rgbatoimg(Memimage*, u32int);
202 extern u32int		_imgtorgba(Memimage*, u32int);
203 extern u32int		_pixelbits(Memimage*, Point);
204 extern int		_unloadmemimage(Memimage*, Rectangle, uchar*, int);
205 extern Memdrawparam*	_memimagedrawsetup(Memimage*,
206 				Rectangle, Memimage*, Point, Memimage*,
207 				Point, int);
208 extern void		_memimagedraw(Memdrawparam*);
209 extern void		_drawreplacescreenimage(Memimage*);