diff options
Diffstat (limited to 'src/libdraw/readcolmap.c')
-rw-r--r-- | src/libdraw/readcolmap.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/libdraw/readcolmap.c b/src/libdraw/readcolmap.c new file mode 100644 index 00000000..6eb8ee26 --- /dev/null +++ b/src/libdraw/readcolmap.c @@ -0,0 +1,49 @@ +#include <u.h> +#include <libc.h> +#include <draw.h> +#include <bio.h> + +static ulong +getval(char **p) +{ + ulong v; + char *q; + + v = strtoul(*p, &q, 0); + v |= v<<8; + v |= v<<16; + *p = q; + return v; +} + +void +readcolmap(Display *d, RGB *colmap) +{ + int i; + char *p, *q; + Biobuf *b; + char buf[128]; + + USED(screen); + + sprint(buf, "/dev/draw/%d/colormap", d->dirno); + b = Bopen(buf, OREAD); + if(b == 0) + drawerror(d, "rdcolmap: can't open colormap device"); + + for(;;) { + p = Brdline(b, '\n'); + if(p == 0) + break; + i = strtoul(p, &q, 0); + if(i < 0 || i > 255) { + fprint(2, "rdcolmap: bad index\n"); + exits("bad"); + } + p = q; + colmap[255-i].red = getval(&p); + colmap[255-i].green = getval(&p); + colmap[255-i].blue = getval(&p); + } + Bterm(b); +} |