[src/trunk]: src/sys/dev/videomode add a bunch of small utility functions to ...

[macallan <macallan%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/690609d28b11
branches:  trunk
changeset: 754582:690609d28b11
user:      macallan <macallan%NetBSD.org@localhost>
date:      Tue May 04 21:17:10 2010 +0000

description:
add a bunch of small utility functions to pick video modes based on things
like dot clock, resolution etc.

diffstat:

 sys/dev/videomode/files.videomode |    4 +-
 sys/dev/videomode/pickmode.c      |  101 ++++++++++++++++++++++++++++++++++++++
 sys/dev/videomode/videomode.h     |    5 +-
 3 files changed, 108 insertions(+), 2 deletions(-)

diffs (139 lines):

diff -r a10a8b72620d -r 690609d28b11 sys/dev/videomode/files.videomode
--- a/sys/dev/videomode/files.videomode Tue May 04 19:23:56 2010 +0000
+++ b/sys/dev/videomode/files.videomode Tue May 04 21:17:10 2010 +0000
@@ -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 @@
 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
diff -r a10a8b72620d -r 690609d28b11 sys/dev/videomode/pickmode.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/videomode/pickmode.c      Tue May 04 21:17:10 2010 +0000
@@ -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;
+}
diff -r a10a8b72620d -r 690609d28b11 sys/dev/videomode/videomode.h
--- a/sys/dev/videomode/videomode.h     Tue May 04 19:23:56 2010 +0000
+++ b/sys/dev/videomode/videomode.h     Tue May 04 21:17:10 2010 +0000
@@ -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 @@
 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 */