[src/trunk]: src/share/man/man4 documentation for WSDISPLAYIO_FBINFO

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

details:   https://anonhg.NetBSD.org/src/rev/d5c1ba625d20
branches:  trunk
changeset: 846165:d5c1ba625d20
user:      tnn <tnn%NetBSD.org@localhost>
date:      Sat Nov 02 19:22:36 2019 +0000

description:
documentation for WSDISPLAYIO_FBINFO

diffstat:

 share/man/man4/wsdisplay.4 |  50 ++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 48 insertions(+), 2 deletions(-)

diffs (71 lines):

diff -r d4e21fd1a53a -r d5c1ba625d20 share/man/man4/wsdisplay.4
--- a/share/man/man4/wsdisplay.4        Sat Nov 02 18:56:41 2019 +0000
+++ b/share/man/man4/wsdisplay.4        Sat Nov 02 19:22:36 2019 +0000
@@ -1,4 +1,4 @@
-.\" $NetBSD: wsdisplay.4,v 1.47 2019/08/12 11:11:28 nia Exp $
+.\" $NetBSD: wsdisplay.4,v 1.48 2019/11/02 19:22:36 tnn Exp $
 .\"
 .\" Copyright (c) 1999 Matthias Drochner.
 .\" Copyright (c) 2002 Ben Harris.
@@ -26,7 +26,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd October 25, 2015
+.Dd November 2, 2019
 .Dt WSDISPLAY 4
 .Os
 .Sh NAME
@@ -192,6 +192,52 @@
 Retrieve the type of the display.
 The list of types is in
 .In dev/wscons/wsconsio.h .
+.It Dv WSDISPLAYIO_FBINFO Pq Li "struct wsdisplayio_fbinfo"
+Retrieve extended information about a framebuffer display,
+including the framebuffer's pixel packing layout.
+The returned structure is as follows:
+.Bd -literal -offset indent
+struct wsdisplayio_fbinfo {
+       uint64_t fbi_fbsize;
+       uint64_t fbi_fboffset;
+       uint32_t fbi_width;
+       uint32_t fbi_height;
+       uint32_t fbi_stride;
+       uint32_t fbi_bitsperpixel;
+       uint32_t fbi_pixeltype;
+       union _fbi_subtype {
+               struct _fbi_rgbmasks {
+                       uint32_t red_offset;
+                       uint32_t red_size;
+                       uint32_t green_offset;
+                       uint32_t green_size;
+                       uint32_t blue_offset;
+                       uint32_t blue_size;
+                       uint32_t alpha_offset;
+                       uint32_t alpha_size;
+               } fbi_rgbmasks;
+               struct _fbi_cmapinfo {
+                       uint32_t cmap_entries;
+               } fbi_cmapinfo;
+       } fbi_subtype;
+       uint32_t fbi_flags;
+};
+.Ed
+.Pp
+For a "true colour" display, the
+.Va fbi_pixeltype
+field contains
+.Dv WSFB_RGB
+and the
+.Va fbi_rgbmasks
+field contains the pixel packing layout.
+For a colour indexed display, the
+.Va fbi_pixeltype
+field contains
+.Dv WSFB_CI
+and the
+.Va fbi_cmapinfo
+field contains the number of color map entries.
 .It Dv WSDISPLAYIO_GINFO Pq Li "struct wsdisplay_fbinfo"
 Retrieve basic information about a framebuffer display.
 The returned structure is as follows: