102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/* $NetBSD: pickmode.c,v 1.1 2010/05/04 21:17:10 macallan Exp $ */
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/*-
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* Copyright (c) 2006 The NetBSD Foundation
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* All rights reserved.
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*
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* this code was contributed to The NetBSD Foundation by Michael Lorenz
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE NETBSD FOUNDATION BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: pickmode.c,v 1.1 2010/05/04 21:17:10 macallan Exp $");
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#include <sys/param.h>
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#include <dev/videomode/videomode.h>
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#include "opt_videomode.h"
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#ifdef PICKMODE_DEBUG
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#define DPRINTF printf
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#else
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#define DPRINTF while (0) printf
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#endif
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const struct videomode *
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pick_mode_by_dotclock(int width, int height, int dotclock)
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{
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const struct videomode *this, *best = NULL;
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int i;
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DPRINTF("%s: looking for %d x %d at up to %d kHz\n", __func__, width,
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height, dotclock);
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for (i = 0; i < videomode_count; i++) {
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this = &videomode_list[i];
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if ((this->hdisplay != width) || (this->vdisplay != height) ||
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(this->dot_clock > dotclock))
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continue;
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if (best != NULL) {
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if (this->dot_clock > best->dot_clock)
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best = this;
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} else
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best = this;
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}
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if (best!= NULL)
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DPRINTF("found %s\n", best->name);
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return best;
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}
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const struct videomode *
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pick_mode_by_ref(int width, int height, int refresh)
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{
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const struct videomode *this, *best = NULL;
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int mref, closest = 1000, i, diff;
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DPRINTF("%s: looking for %d x %d at up to %d Hz\n", __func__, width,
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height, refresh);
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for (i = 0; i < videomode_count; i++) {
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this = &videomode_list[i];
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mref = this->dot_clock * 1000 / (this->htotal * this->vtotal);
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diff = abs(mref - refresh);
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if ((this->hdisplay != width) || (this->vdisplay != height) ||
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(diff > closest))
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continue;
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if (best != NULL) {
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if (diff < closest) {
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best = this;
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closest = diff;
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}
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} else
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best = this;
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}
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if (best!= NULL)
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DPRINTF("found %s\n", best->name);
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return best;
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}
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