RASOPS(9)              NetBSD Kernel Developer's Manual              RASOPS(9)

NAME
     rasops, rasops_init, rasops_reconfig -- raster display operations

SYNOPSIS
     #include <dev/wscons/wsdisplayvar.h>
     #include <dev/rasops/rasops.h>

     int
     rasops_init(struct rasops_info *ri, int wantrows, int wantcols);

     int
     rasops_reconfig(struct rasops_info *ri, int wantrows, int wantcols);

DESCRIPTION
     The rasops subsystem is a set of raster operations for wscons(9).

     The primary data type for using the raster operations is the rasops_info
     structure in dev/rasops/rasops.h:

     struct rasops_info {

             /*
              * These must be filled in by the caller
              */
             int     ri_depth;       /* depth in bits */
             u_char  *ri_bits;       /* ptr to bits */
             int     ri_width;       /* width (pels) */
             int     ri_height;      /* height (pels) */
             int     ri_stride;      /* stride in bytes */

             /*
              * If you want shadow framebuffer support, point ri_hwbits
              * to the real framebuffer, and ri_bits to the shadow framebuffer
              */
             u_char  *ri_hwbits;

             /*
              * These can optionally be left zeroed out. If you fill ri_font,
              * but aren't using wsfont, set ri_wsfcookie to -1.
              */
             struct  wsdisplay_font *ri_font;
             int     ri_wsfcookie;   /* wsfont cookie */
             void    *ri_hw;         /* driver private data */
             int     ri_crow;        /* cursor row */
             int     ri_ccol;        /* cursor column */
             int     ri_flg;         /* various operational flags */

             /*
              * These are optional and will default if zero. Meaningless
              * on depths other than 15, 16, 24 and 32 bits per pel. On
              * 24 bit displays, ri_{r,g,b}num must be 8.
              */
             u_char  ri_rnum;        /* number of bits for red */
             u_char  ri_gnum;        /* number of bits for green */
             u_char  ri_bnum;        /* number of bits for blue */
             u_char  ri_rpos;        /* which bit red starts at */
             u_char  ri_gpos;        /* which bit green starts at */
             u_char  ri_bpos;        /* which bit blue starts at */

             /*
              * These are filled in by rasops_init()
              */
             int     ri_emuwidth;    /* width we actually care about */
             int     ri_emuheight;   /* height we actually care about */
             int     ri_emustride;   /* bytes per row we actually care about */
             int     ri_rows;        /* number of rows (characters) */
             int     ri_cols;        /* number of columns (characters) */
             int     ri_delta;       /* row delta in bytes */
             int     ri_pelbytes;    /* bytes per pel (may be zero) */
             int     ri_fontscale;   /* fontheight * fontstride */
             int     ri_xscale;      /* fontwidth * pelbytes */
             int     ri_yscale;      /* fontheight * stride */
             u_char  *ri_origbits;   /* where screen bits actually start */
             int     ri_xorigin;     /* where ri_bits begins (x) */
             int     ri_yorigin;     /* where ri_bits begins (y) */
             int32_t ri_devcmap[16]; /* color -> framebuffer data */

             /*
              * The emulops you need to use, and the screen caps for wscons
              */
             struct  wsdisplay_emulops ri_ops;
             int     ri_caps;

             /*
              * Callbacks so we can share some code
              */
             void    (*ri_do_cursor)(struct rasops_info *);
     };

     Valid values for the ri_flg member are:

           RI_FULLCLEAR   eraserows() hack to clear full screen
           RI_FORCEMONO   monochrome output even if we can do color
           RI_BSWAP       framebuffer endianness doesn't match CPU
           RI_CURSOR      cursor is switched on
           RI_CLEAR       clear display on startup
           RI_CENTER      center onscreen output
           RI_CURSORCLIP  cursor is currently clipped
           RI_CFGDONE     rasops_reconfig() completed successfully

FUNCTIONS
     rasops_init(ri, wantrows, wantcols)
              Initialise a rasops_info descriptor.  The arguments wantrows and
              wantcols are the number of rows and columns we'd like.  In terms
              of optimization, fonts that are a multiple of 8 pixels wide work
              the best.

     rasops_reconfig(ri, wantrows, wantcols)
              Reconfigure a rasops_info descriptor because parameters have
              changed in some way.  The arguments wantrows and wantcols are
              the number of rows and columns we'd like.  If calling
              rasops_reconfig() to change the font and ri_wsfcookie >= 0, you
              must call wsfont_unlock() on it, and reset it to -1 (or a new,
              valid cookie).

CODE REFERENCES
     This section describes places within the NetBSD source tree where actual
     code implementing or using the rasops subsystem can be found.  All path-
     names are relative to /usr/src.

     The rasops subsystem is implemented within the directory sys/dev/rasops.
     The rasops module itself is implemented within the file
     sys/dev/rasops/rasops.c.

SEE ALSO
     intro(9), wscons(9), wsdisplay(9), wsfont(9)

HISTORY
     The rasops subsystem appeared in NetBSD 1.5.

AUTHORS
     The rasops subsystem was written by Andrew Doran <ad@NetBSD.org>.

NetBSD 5.1                      October 7, 2001                     NetBSD 5.1

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