13 #define MAXFBWIDTH (1 << 12)
14 #define BPP sizeof(fbval_t)
15 #define NLEVELS (1 << 8)
18 static unsigned char *fb
;
19 static struct fb_var_screeninfo vinfo
;
20 static struct fb_fix_screeninfo finfo
;
21 static int rl
, rr
, gl
, gr
, bl
, br
;
22 static int nr
, ng
, nb
;
26 return vinfo
.xres_virtual
* vinfo
.yres_virtual
* BPP
;
29 static void fb_cmap_save(int save
)
31 static unsigned short red
[NLEVELS
], green
[NLEVELS
], blue
[NLEVELS
];
33 if (finfo
.visual
== FB_VISUAL_TRUECOLOR
)
36 cmap
.len
= MAX(nr
, MAX(ng
, nb
));
41 ioctl(fd
, save
? FBIOGETCMAP
: FBIOPUTCMAP
, &cmap
);
46 unsigned short red
[NLEVELS
], green
[NLEVELS
], blue
[NLEVELS
];
49 if (finfo
.visual
== FB_VISUAL_TRUECOLOR
)
52 for (i
= 0; i
< nr
; i
++)
53 red
[i
] = (65535 / (nr
- 1)) * i
;
54 for (i
= 0; i
< ng
; i
++)
55 green
[i
] = (65535 / (ng
- 1)) * i
;
56 for (i
= 0; i
< nb
; i
++)
57 blue
[i
] = (65535 / (nb
- 1)) * i
;
60 cmap
.len
= MAX(nr
, MAX(ng
, nb
));
66 ioctl(fd
, FBIOPUTCMAP
, &cmap
);
69 static void xerror(char *msg
)
75 static void xdie(char *msg
)
77 fprintf(stderr
, "%s\n", msg
);
81 static void init_colors(void)
83 nr
= 1 << vinfo
.red
.length
;
84 ng
= 1 << vinfo
.green
.length
;
85 nb
= 1 << vinfo
.blue
.length
;
86 rr
= 8 - vinfo
.red
.length
;
87 rl
= vinfo
.red
.offset
;
88 gr
= 8 - vinfo
.green
.length
;
89 gl
= vinfo
.green
.offset
;
90 br
= 8 - vinfo
.blue
.length
;
91 bl
= vinfo
.blue
.offset
;
96 fd
= open(FBDEV_PATH
, O_RDWR
);
98 xerror("can't open " FBDEV_PATH
);
99 if (ioctl(fd
, FBIOGET_VSCREENINFO
, &vinfo
) == -1)
100 xerror("ioctl failed");
101 if (ioctl(fd
, FBIOGET_FSCREENINFO
, &finfo
) == -1)
102 xerror("ioctl failed");
103 if ((vinfo
.bits_per_pixel
+ 7) >> 3 != BPP
)
104 xdie("fbval_t does not match framebuffer depth");
106 fb
= mmap(NULL
, fb_len(), PROT_READ
| PROT_WRITE
, MAP_SHARED
, fd
, 0);
107 if (fb
== MAP_FAILED
)
108 xerror("can't map the framebuffer");
113 void fb_set(int r
, int c
, fbval_t
*mem
, int len
)
115 long loc
= (c
+ vinfo
.xoffset
) * BPP
+
116 (r
+ vinfo
.yoffset
) * finfo
.line_length
;
117 memcpy(fb
+ loc
, mem
, len
* BPP
);
123 munmap(fb
, fb_len());
127 fbval_t
fb_color(unsigned char r
, unsigned char g
, unsigned char b
)
129 return ((r
>> rr
) << rl
) | ((g
>> gr
) << gl
) | ((b
>> br
) << bl
);
142 static unsigned char *rowaddr(int r
)
144 return fb
+ (r
+ vinfo
.yoffset
) * finfo
.line_length
;
147 static unsigned long cache
[MAXFBWIDTH
];
148 void fb_box(int sr
, int sc
, int er
, int ec
, fbval_t val
)
151 int pc
= sizeof(cache
[0]) / sizeof(val
);
152 int cn
= MIN((ec
- sc
) / pc
+ 1, MAXFBWIDTH
);
153 unsigned long nv
= val
;
154 for (i
= 1; i
< pc
; i
++)
155 nv
= (nv
<< (sizeof(val
) * 8)) | val
;
156 for (i
= 0; i
< cn
; i
++)
158 for (i
= sr
; i
< er
; i
++)
159 memcpy(rowaddr(i
) + sc
* BPP
, cache
, (ec
- sc
) * BPP
);