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_FULLCLEAReraserows() hack to clear full screenRI_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_CFGDONErasops_reconfig() completed successfullyRI_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
HISTORY
The rasops subsystem appeared in
NetBSD 1.5.
AUTHORS
The rasops subsystem was written by
Andrew Doran ⟨ad@NetBSD.org⟩.