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
           RI_NO_AUTO          do not generate box drawing characters for ISO
                               fonts.  Use this when it is not safe to allo-
                               cate memory, for example when setting up an
                               early console.
           RI_ENABLE_ALPHA     set this if the caller supports anti-aliased
                               fonts in the given colour depth.  Without this
                               flag rasops_init() will only pick bitmap fonts.
           RI_8BIT_IS_RGB      set this if the caller uses an R3G3B2 colour
                               map in 8 bit.  rasops_init() will generate an
                               appropriate ri_devcmap[] but the caller still
                               needs to set up the actual colour map.

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.  Passing zero for
              either one of them uses the default - normally 80x25 but it can
              be changed with

                    options RASOPS_DEFAULT_WIDTH=80
                    options RASOPS_DEFAULT_HEIGHT=25
              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
     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 6.0.1                   January 13, 2012                   NetBSD 6.0.1

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