1 #ifndef _MEMDRAW_H_
2 #define _MEMDRAW_H_ 1
3 #if defined(__cplusplus)
4 extern "C" { 
5 #endif
6 typedef struct	Memimage Memimage;
7 typedef struct	Memdata Memdata;
8 typedef struct	Memsubfont Memsubfont;
9 typedef struct	Memlayer Memlayer;
10 typedef struct	Memcmap Memcmap;
11 typedef struct	Memdrawparam	Memdrawparam;
12 
13 /*
14  * Memdata is allocated from main pool, but .data from the image pool.
15  * Memdata is allocated separately to permit patching its pointer after
16  * compaction when windows share the image data.
17  * The first word of data is a back pointer to the Memdata, to find
18  * The word to patch.
19  */
20 
21 struct Memdata
22 {
23 	u32int	*base;	/* allocated data pointer */
24 	uchar	*bdata;	/* pointer to first byte of actual data; word-aligned */
25 	int	ref;	/* number of Memimages using this data */
26 	void*	imref;
27 	int	allocd;	/* is this malloc'd? */
28 };
29 
30 enum {
31 	Frepl	= 1<<0,	/* is replicated */
32 	Fsimple	= 1<<1,	/* is 1x1 */
33 	Fgrey	= 1<<2,	/* is grey */
34 	Falpha	= 1<<3,	/* has explicit alpha */
35 	Fcmap	= 1<<4,	/* has cmap channel */
36 	Fbytes	= 1<<5	/* has only 8-bit channels */
37 };
38 
39 struct Memimage
40 {
41 	Rectangle	r;	/* rectangle in data area, local coords */
42 	Rectangle	clipr;	/* clipping region */
43 	int		depth;	/* number of bits of storage per pixel */
44 	int		nchan;	/* number of channels */
45 	u32int		chan;	/* channel descriptions */
46 	Memcmap		*cmap;
47 
48 	Memdata		*data;	/* pointer to data; shared by windows in this image */
49 	int		zero;	/* data->bdata+zero==&byte containing (0,0) */
50 	u32int		width;	/* width in words of a single scan line */
51 	Memlayer	*layer;	/* nil if not a layer*/
52 	u32int		flags;
53 	void		*X;
54 	int		screenref;	/* reference count if this is a screen */
55 
56 	int		shift[NChan];
57 	int		mask[NChan];
58 	int		nbits[NChan];
59 };
60 
61 struct Memcmap
62 {
63 	uchar	cmap2rgb[3*256];
64 	uchar	rgb2cmap[16*16*16];
65 };
66 
67 /*
68  * Subfonts
69  *
70  * given char c, Subfont *f, Fontchar *i, and Point p, one says
71  *	i = f->info+c;
72  *	draw(b, Rect(p.x+i->left, p.y+i->top,
73  *		p.x+i->left+((i+1)->x-i->x), p.y+i->bottom),
74  *		color, f->bits, Pt(i->x, i->top));
75  *	p.x += i->width;
76  * to draw characters in the specified color (itself a Memimage) in Memimage b.
77  */
78 
79 struct	Memsubfont
80 {
81 	char		*name;
82 	short		n;		/* number of chars in font */
83 	uchar		height;		/* height of bitmap */
84 	char		ascent;		/* top of bitmap to baseline */
85 	Fontchar	*info;		/* n+1 character descriptors */
86 	Memimage	*bits;		/* of font */
87 };
88 
89 /*
90  * Encapsulated parameters and information for sub-draw routines.
91  */
92 enum {
93 	Simplesrc=1<<0,
94 	Simplemask=1<<1,
95 	Replsrc=1<<2,
96 	Replmask=1<<3,
97 	Fullsrc=1<<4,
98 	Fullmask=1<<5
99 };
100 struct	Memdrawparam
101 {
102 	Memimage *dst;
103 	Rectangle	r;
104 	Memimage *src;
105 	Rectangle sr;
106 	Memimage *mask;
107 	Rectangle mr;
108 	int op;
109 
110 	u32int state;
111 	u32int mval;	/* if Simplemask, the mask pixel in mask format */
112 	u32int mrgba;	/* mval in rgba */
113 	u32int sval;	/* if Simplesrc, the source pixel in src format */
114 	u32int srgba;	/* sval in rgba */
115 	u32int sdval;	/* sval in dst format */
116 };
117 
118 /*
119  * Memimage management
120  */
121 
122 extern Memimage*	allocmemimage(Rectangle, u32int);
123 extern Memimage*	allocmemimaged(Rectangle, u32int, Memdata*, void*);
124 extern Memimage*	readmemimage(int);
125 extern Memimage*	creadmemimage(int);
126 extern int		writememimage(int, Memimage*);
127 extern void		freememimage(Memimage*);
128 extern int		loadmemimage(Memimage*, Rectangle, uchar*, int);
129 extern int		cloadmemimage(Memimage*, Rectangle, uchar*, int);
130 extern int		unloadmemimage(Memimage*, Rectangle, uchar*, int);
131 extern u32int*		wordaddr(Memimage*, Point);
132 extern uchar*		byteaddr(Memimage*, Point);
133 extern int		drawclip(Memimage*, Rectangle*, Memimage*, Point*,
134 				Memimage*, Point*, Rectangle*, Rectangle*);
135 extern void		memfillcolor(Memimage*, u32int);
136 extern int		memsetchan(Memimage*, u32int);
137 extern u32int		pixelbits(Memimage*, Point);
138 
139 /*
140  * Graphics
141  */
142 extern void	memdraw(Memimage*, Rectangle, Memimage*, Point, 
143 			Memimage*, Point, int);
144 extern void	memline(Memimage*, Point, Point, int, int, int,
145 			Memimage*, Point, int);
146 extern void	mempoly(Memimage*, Point*, int, int, int, int,
147 			Memimage*, Point, int);
148 extern void	memfillpoly(Memimage*, Point*, int, int,
149 			Memimage*, Point, int);
150 extern void	_memfillpolysc(Memimage*, Point*, int, int,
151 			Memimage*, Point, int, int, int, int);
152 extern void	memimagedraw(Memimage*, Rectangle, Memimage*, Point,
153 			Memimage*, Point, int);
154 extern int	hwdraw(Memdrawparam*);
155 extern void	memimageline(Memimage*, Point, Point, int, int, int,
156 			Memimage*, Point, int);
157 extern void	_memimageline(Memimage*, Point, Point, int, int, int,
158 			Memimage*, Point, Rectangle, int);
159 extern Point	memimagestring(Memimage*, Point, Memimage*, Point,
160 			Memsubfont*, char*);
161 extern void	memellipse(Memimage*, Point, int, int, int,
162 			Memimage*, Point, int);
163 extern void	memarc(Memimage*, Point, int, int, int, Memimage*,
164 			Point, int, int, int);
165 extern Rectangle memlinebbox(Point, Point, int, int, int);
166 extern int	memlineendsize(int);
167 extern void	_memmkcmap(void);
168 extern void	memimageinit(void);
169 
170 /*
171  * Subfont management
172  */
173 extern Memsubfont*	allocmemsubfont(char*, int, int, int, Fontchar*, Memimage*);
174 extern Memsubfont*	openmemsubfont(char*);
175 extern void		freememsubfont(Memsubfont*);
176 extern Point		memsubfontwidth(Memsubfont*, char*);
177 extern Memsubfont*	getmemdefont(void);
178 
179 /*
180  * Predefined 
181  */
182 extern	Memimage*	memwhite;
183 extern	Memimage*	memblack;
184 extern	Memimage*	memopaque;
185 extern	Memimage*	memtransparent;
186 extern	Memcmap*	memdefcmap;
187 
188 /*
189  * Kernel interface
190  */
191 void			memimagemove(void*, void*);
192 
193 /*
194  * Kernel cruft
195  */
196 extern void		rdb(void);
197 extern int		iprint(char*, ...);
198 extern int		drawdebug;
199 
200 /*
201  * For other implementations, like x11.
202  */
203 extern void		_memfillcolor(Memimage*, u32int);
204 extern Memimage*	_allocmemimage(Rectangle, u32int);
205 extern int		_cloadmemimage(Memimage*, Rectangle, uchar*, int);
206 extern int		_loadmemimage(Memimage*, Rectangle, uchar*, int);
207 extern void		_freememimage(Memimage*);
208 extern u32int		_rgbatoimg(Memimage*, u32int);
209 extern u32int		_imgtorgba(Memimage*, u32int);
210 extern u32int		_pixelbits(Memimage*, Point);
211 extern int		_unloadmemimage(Memimage*, Rectangle, uchar*, int);
212 extern Memdrawparam*	_memimagedrawsetup(Memimage*,
213 				Rectangle, Memimage*, Point, Memimage*,
214 				Point, int);
215 extern void		_memimagedraw(Memdrawparam*);
216 extern void		_drawreplacescreenimage(Memimage*);
217 
218 #if defined(__cplusplus)
219 }
220 #endif
221 #endif