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 console.
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 — normally 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 optimized.

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>.