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add a bunch of small utility functions to pick video modes based on things 

like dot clock, resolution etc.
This commit is contained in:
macallan 2010-05-04 21:17:10 +00:00
parent a2c1ee7188
commit d3a30408f7
3 changed files with 108 additions and 2 deletions
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4
sys/dev/videomode/files.videomode
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@ -1,4 +1,4 @@
# $NetBSD: files.videomode,v 1.3 2006/05/11 01:49:53 gdamore Exp $
# $NetBSD: files.videomode,v 1.4 2010/05/04 21:17:10 macallan Exp $
define videomode
define edid
@ -7,5 +7,7 @@ define vesagtf
file dev/videomode/videomode.c videomode | edid
file dev/videomode/edid.c edid
file dev/videomode/pickmode.c videomode
defflag opt_videomode.h PICKMODE_DEBUG
file dev/videomode/vesagtf.c vesagtf | edid

101
sys/dev/videomode/pickmode.c Normal file
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@ -0,0 +1,101 @@
/* $NetBSD: pickmode.c,v 1.1 2010/05/04 21:17:10 macallan Exp $ */
/*-
* Copyright (c) 2006 The NetBSD Foundation
* All rights reserved.
*
* this code was contributed to The NetBSD Foundation by Michael Lorenz
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE NETBSD FOUNDATION BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pickmode.c,v 1.1 2010/05/04 21:17:10 macallan Exp $");
#include <sys/param.h>
#include <dev/videomode/videomode.h>
#include "opt_videomode.h"
#ifdef PICKMODE_DEBUG
#define DPRINTF printf
#else
#define DPRINTF while (0) printf
#endif
const struct videomode *
pick_mode_by_dotclock(int width, int height, int dotclock)
{
const struct videomode *this, *best = NULL;
int i;
DPRINTF("%s: looking for %d x %d at up to %d kHz\n", __func__, width,
height, dotclock);
for (i = 0; i < videomode_count; i++) {
this = &videomode_list[i];
if ((this->hdisplay != width) || (this->vdisplay != height) ||
(this->dot_clock > dotclock))
continue;
if (best != NULL) {
if (this->dot_clock > best->dot_clock)
best = this;
} else
best = this;
}
if (best!= NULL)
DPRINTF("found %s\n", best->name);
return best;
}
const struct videomode *
pick_mode_by_ref(int width, int height, int refresh)
{
const struct videomode *this, *best = NULL;
int mref, closest = 1000, i, diff;
DPRINTF("%s: looking for %d x %d at up to %d Hz\n", __func__, width,
height, refresh);
for (i = 0; i < videomode_count; i++) {
this = &videomode_list[i];
mref = this->dot_clock * 1000 / (this->htotal * this->vtotal);
diff = abs(mref - refresh);
if ((this->hdisplay != width) || (this->vdisplay != height) ||
(diff > closest))
continue;
if (best != NULL) {
if (diff < closest) {
best = this;
closest = diff;
}
} else
best = this;
}
if (best!= NULL)
DPRINTF("found %s\n", best->name);
return best;
}

5
sys/dev/videomode/videomode.h
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@ -1,4 +1,4 @@
/* $NetBSD: videomode.h,v 1.1 2006/03/04 02:34:27 gdamore Exp $ */
/* $NetBSD: videomode.h,v 1.2 2010/05/04 21:17:10 macallan Exp $ */
/*
* Copyright (c) 2001, 2002 Bang Jun-Young
@ -66,4 +66,7 @@ struct videomode {
extern const struct videomode videomode_list[];
extern const int videomode_count;
const struct videomode *pick_mode_by_dotclock(int, int, int);
const struct videomode *pick_mode_by_ref(int, int, int);
#endif /* _DEV_VIDEOMODE_H */