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RASOPS(9) Kernel Developer's Manual RASOPS(9)

rasops, rasops_init, rasops_reconfigraster display operations

#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);

The rasops subsystem is a set of raster operations for wscons(4).

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 */

	/*
	 * 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 */
	struct wsdisplay_charcell *ri_bs; /* character backing store */
	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 *);
	void	(*ri_updatecursor)(struct rasops_info *);

#if NRASOPS_ROTATION > 0
	/* Used to intercept putchar to permit display rotation */
	struct	wsdisplay_emulops ri_real_ops;
#endif
};

The value of the ri_flg member is formed by OR'ing the following values:

RI_FULLCLEAR
Force eraserows() to clear the whole screen instead of only text lines, when invoked with an nrows parameter equal to the number of text lines.
RI_FORCEMONO
Do not output coloured text, even if the display supports it.
RI_BSWAP
Specifies that the frame buffer endianness is different from the CPU's.
RI_CURSOR
Set when the text cursor is enabled.
RI_CLEAR
Clear the display upon initialization.
RI_CLEARMARGINS
Clear display margins upon initialization.
RI_CENTER
Center the text area.
RI_ROTATE_CW
Rotate the text display quarter clockwise.
RI_ROTATE_CCW
Rotate the text display quarter counter-clockwise.
RI_CFGDONE
rasops_reconfig() completed successfully
RI_VCONS
Support the use of multiple screens.
RI_WRONLY
Do not read back pixels from the frame buffer memory when performing screen-to-screen copy operations. This flag is ignored unless RI_VCONS is set or the ri_bs member is set.

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. 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).

This section describes places within the OpenBSD source tree where actual code implementing or utilising the rasops subsystem can be found. All pathnames are relative to /usr/src.

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.

intro(9)

The rasops subsystem appeared in NetBSD 1.5 and OpenBSD first support appeared in OpenBSD 2.9.

The rasops subsystem was written by Andrew Doran <ad@NetBSD.org>. Display rotation was written by Christopher Pascoe <pascoe@openbsd.org>.

Display rotation only works for 16bpp displays.

August 21, 2017 OpenBSD-current