1 '\" te
   2 .\" Copyright (c) 2003, Sun Microsystems, Inc.
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   5 .\" When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE.  If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
   6 .TH FBIO 7I "May 12, 2003"
   7 .SH NAME
   8 fbio \- frame buffer control operations
   9 .SH DESCRIPTION
  10 .sp
  11 .LP
  12 The frame buffers provided with this release support the same general interface
  13 that is defined by \fB<sys/fbio.h>\fR\&. Each responds to an \fBFBIOGTYPE\fR
  14 \fBioctl\fR(2) request which returns information in a \fBfbtype\fR structure.
  15 .sp
  16 .LP
  17 Each device has an \fBFBTYPE\fR which is used by higher-level software to
  18 determine how to perform graphics functions. Each device is used by opening it,
  19 doing an \fBFBIOGTYPE\fR \fBioctl()\fR to see which frame buffer type is
  20 present, and thereby selecting the appropriate device-management routines.
  21 .sp
  22 .LP
  23 \fBFBIOGINFO\fR returns information specific to the GS accelerator.
  24 .sp
  25 .LP
  26 \fBFBIOSVIDEO\fR and \fBFBIOGVIDEO\fR are general-purpose \fBioctl()\fR
  27 requests for controlling possible video features of frame buffers. These
  28 \fBioctl()\fR requests either set or return the value of a flags integer. At
  29 this point, only the \fBFBVIDEO_ON\fR option is available, controlled by
  30 \fBFBIOSVIDEO\fR. \fBFBIOGVIDEO\fR returns the current video state.
  31 .sp
  32 .LP
  33 The \fBFBIOSATTR\fR and \fBFBIOGATTR\fR \fBioctl()\fR requests allow access to
  34 special features of newer frame buffers. They use the  \fBfbsattr\fR and
  35 \fBfbgattr\fR structures.
  36 .sp
  37 .LP
  38 Some color frame buffers support the \fBFBIOPUTCMAP\fR and \fBFBIOGETCMAP\fR
  39 \fBioctl()\fR requests, which provide access to the colormap. They use the
  40 \fBfbcmap\fR structure.
  41 .sp
  42 .LP
  43 Also, some framebuffers with multiple colormaps will either encode the colormap
  44 identifier in the high-order bits of the "index" field in the fbcmap structure,
  45 or use the \fBFBIOPUTCMAPI\fR and \fBFBIOGETCMAPI\fR \fBioctl()\fR requests.
  46 .sp
  47 .LP
  48 \fBFBIOVERTICAL\fR is used to wait for the start of the next vertical retrace
  49 period.
  50 .sp
  51 .LP
  52 \fBFBIOVRTOFFSET\fR Returns the offset to a read-only \fIvertical retrace
  53 page\fR for those framebuffers that support it.  This vertical retrace page may
  54 be mapped into user space with \fBmmap\fR(2). The first word of the vertical
  55 retrace page (type unsigned int) is a counter that is incremented every time
  56 there is a vertical retrace.  The user process can use this counter in a
  57 variety of ways.
  58 .sp
  59 .LP
  60 \fBFBIOMONINFO\fR returns a mon_info structure which contains information about
  61 the monitor attached to the framebuffer, if available.
  62 .sp
  63 .LP
  64 \fBFBIOSCURSOR\fR, \fBFBIOGCURSOR\fR, \fBFBIOSCURPOS\fR and \fBFBIOGCURPOS\fR
  65 are used to control the hardware cursor for those framebuffers that have this
  66 feature. \fBFBIOGCURMAX\fR returns the maximum sized cursor supported by the
  67 framebuffer.  Attempts to create a cursor larger than this will fail.
  68 .sp
  69 .LP
  70 Finally \fBFBIOSDEVINFO\fR and \fBFBIOGDEVINFO\fR are used to transfer
  71 variable-length, device-specific information into and out of framebuffers.
  72 .SH SEE ALSO
  73 .sp
  74 .LP
  75 \fBioctl\fR(2), \fBmmap\fR(2), \fBcgsix\fR(7D)
  76 .SH BUGS
  77 .sp
  78 .LP
  79 The \fBFBIOSATTR\fR and \fBFBIOGATTR\fR \fBioctl()\fR requests are only
  80 supported by frame buffers which emulate older frame buffer types. If a frame
  81 buffer emulates another frame buffer, \fBFBIOGTYPE\fR returns the emulated
  82 type. To get the real type, use \fBFBIOGATTR\fR.
  83 .sp
  84 .LP
  85 The \fBFBIOGCURPOS\fR ioctl was incorrectly defined in previous operating
  86 systems, and older code running in binary compatibility mode may get incorrect
  87 results.