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 allocate 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⟩.