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);

     options RASOPS_DEFAULT_WIDTH=80
     options RASOPS_DEFAULT_HEIGHT=25

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>.

     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 allocate
                            memory, for example when setting up an early con-
                            sole.
           RI_ENABLE_ALPHA  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   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() initialises a rasops_info descriptor.  rasops_reconfig() is
     used to reconfigure it if 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 -- nor-
     mally 80 by 25 but it can be changed with config options
     RASOPS_DEFAULT_WIDTH and RASOPS_DEFAULT_HEIGHT.

     In terms of optimization, bitmap fonts of width 8 or 16 work the best for
     all depths.  For depths other than 1 the fonts of width 12 are also opti-
     mized.

     If calling rasops_reconfig() to change the font and ri_wsfcookie is non-
     negative, 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 9.0                      August 7, 2019                      NetBSD 9.0

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