47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <lib9.h>
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#include <draw.h>
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/*
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* This code (and the devdraw interface) will have to change
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* if we ever get bitmaps with ldepth > 3, because the
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* colormap will have to be written in chunks
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*/
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void
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writecolmap(Display *d, RGB *m)
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{
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int i, n, fd;
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char buf[64], *t;
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uint32_t r, g, b;
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sprint(buf, "/dev/draw/%d/colormap", d->dirno);
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fd = sys_open(buf, OWRITE);
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if(fd < 0)
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drawerror(d, "writecolmap: open colormap failed");
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t = malloc(8192);
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if (t == nil)
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drawerror(d, "writecolmap: no memory");
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n = 0;
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for(i = 0; i < 256; i++) {
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r = m[i].red>>24;
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g = m[i].green>>24;
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b = m[i].blue>>24;
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n += sprint(t+n, "%d %lud %lud %lud\n", 255-i, r, g, b);
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}
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i = jehanne_write(fd, t, n);
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free(t);
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sys_close(fd);
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if(i != n)
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drawerror(d, "writecolmap: bad write");
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}
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