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/*

 *  linux/drivers/video/console/fbcon.h -- Low level frame buffer based console driver

 *

 *      Copyright (C) 1997 Geert Uytterhoeven

 *

 *  This file is subject to the terms and conditions of the GNU General Public

 *  License.  See the file COPYING in the main directory of this archive

 *  for more details.

 */

#ifndef _VIDEO_FBCON_H

#define _VIDEO_FBCON_H

#include <linux/types.h>

#include <linux/vt_buffer.h>

#include <linux/vt_kern.h>

#include <asm/io.h>

#define FBCON_FLAGS_INIT         1

#define FBCON_FLAGS_CURSOR_TIMER 2

   /*

    *    This is the interface between the low-level console driver and the

    *    low-level frame buffer device

    */

struct display {

    /* Filled in by the low-level console driver */

    const u_char *fontdata;

    int userfont;                   /* != 0 if fontdata kmalloc()ed */

    u_short scrollmode;             /* Scroll Method */

    u_short inverse;                /* != 0 text black on white as default */

    short yscroll;                  /* Hardware scrolling */

    int vrows;                      /* number of virtual rows */

    int cursor_shape;

    int con_rotate;

    u32 xres_virtual;

    u32 yres_virtual;

    u32 height;

    u32 width;

    u32 bits_per_pixel;

    u32 grayscale;

    u32 nonstd;

    u32 accel_flags;

    u32 rotate;

    struct fb_bitfield red;

    struct fb_bitfield green;

    struct fb_bitfield blue;

    struct fb_bitfield transp;

    const struct fb_videomode *mode;

};

struct fbcon_ops {

        void (*bmove)(struct vc_data *vc, struct fb_info *info, int sy,

                      int sx, int dy, int dx, int height, int width);

        void (*clear)(struct vc_data *vc, struct fb_info *info, int sy,

                      int sx, int height, int width);

        void (*putcs)(struct vc_data *vc, struct fb_info *info,

                      const unsigned short *s, int count, int yy, int xx,

                      int fg, int bg);

        void (*clear_margins)(struct vc_data *vc, struct fb_info *info,

                              int bottom_only);

        void (*cursor)(struct vc_data *vc, struct fb_info *info, int mode,

                       int softback_lines, int fg, int bg);

        int  (*update_start)(struct fb_info *info);

        int  (*rotate_font)(struct fb_info *info, struct vc_data *vc);

        struct fb_var_screeninfo var;  /* copy of the current fb_var_screeninfo */

        struct timer_list cursor_timer; /* Cursor timer */

        struct fb_cursor cursor_state;

        struct display *p;

        int    currcon;                 /* Current VC. */

        int    cursor_flash;

        int    cursor_reset;

        int    blank_state;

        int    graphics;

        int    flags;

        int    rotate;

        int    cur_rotate;

        char  *cursor_data;

        u8    *fontbuffer;

        u8    *fontdata;

        u8    *cursor_src;

        u32    cursor_size;

        u32    fd_size;

};

    /*

     *  Attribute Decoding

     */

/* Color */

#define attr_fgcol(fgshift,s)    \

        (((s) >> (fgshift)) & 0x0f)

#define attr_bgcol(bgshift,s)    \

        (((s) >> (bgshift)) & 0x0f)

#define attr_bgcol_ec(bgshift,vc) \

        ((vc) ? (((vc)->vc_video_erase_char >> (bgshift)) & 0x0f) : 0)

#define attr_fgcol_ec(fgshift,vc) \

        ((vc) ? (((vc)->vc_video_erase_char >> (fgshift)) & 0x0f) : 0)

/* Monochrome */

#define attr_bold(s) \

        ((s) & 0x200)

#define attr_reverse(s) \

        ((s) & 0x800)

#define attr_underline(s) \

        ((s) & 0x400)

#define attr_blink(s) \

        ((s) & 0x8000)

/* Font */

#define REFCOUNT(fd)    (((int *)(fd))[-1])

#define FNTSIZE(fd)     (((int *)(fd))[-2])

#define FNTCHARCNT(fd)  (((int *)(fd))[-3])

#define FNTSUM(fd)      (((int *)(fd))[-4])

#define FONT_EXTRA_WORDS 4

    /*

     *  Scroll Method

     */

/* There are several methods fbcon can use to move text around the screen:

 *

 *                     Operation   Pan    Wrap

 *---------------------------------------------

 * SCROLL_MOVE         copyarea    No     No

 * SCROLL_PAN_MOVE     copyarea    Yes    No

 * SCROLL_WRAP_MOVE    copyarea    No     Yes

 * SCROLL_REDRAW       imageblit   No     No

 * SCROLL_PAN_REDRAW   imageblit   Yes    No

 * SCROLL_WRAP_REDRAW  imageblit   No     Yes

 *

 * (SCROLL_WRAP_REDRAW is not implemented yet)

 *

 * In general, fbcon will choose the best scrolling

 * method based on the rule below:

 *

 * Pan/Wrap > accel imageblit > accel copyarea >

 * soft imageblit > (soft copyarea)

 *

 * Exception to the rule: Pan + accel copyarea is

 * preferred over Pan + accel imageblit.

 *

 * The above is typical for PCI/AGP cards. Unless

 * overridden, fbcon will never use soft copyarea.

 *

 * If you need to override the above rule, set the

 * appropriate flags in fb_info->flags.  For example,

 * to prefer copyarea over imageblit, set

 * FBINFO_READS_FAST.

 *

 * Other notes:

 * + use the hardware engine to move the text

 *    (hw-accelerated copyarea() and fillrect())

 * + use hardware-supported panning on a large virtual screen

 * + amifb can not only pan, but also wrap the display by N lines

 *    (i.e. visible line i = physical line (i+N) % yres).

 * + read what's already rendered on the screen and

 *     write it in a different place (this is cfb_copyarea())

 * + re-render the text to the screen

 *

 * Whether to use wrapping or panning can only be figured out at

 * runtime (when we know whether our font height is a multiple

 * of the pan/wrap step)

 *

 */

#define SCROLL_MOVE        0x001

#define SCROLL_PAN_MOVE    0x002

#define SCROLL_WRAP_MOVE   0x003

#define SCROLL_REDRAW      0x004

#define SCROLL_PAN_REDRAW  0x005

#ifdef CONFIG_FB_TILEBLITTING

extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info);

#endif

extern void fbcon_set_bitops(struct fbcon_ops *ops);

extern int  soft_cursor(struct fb_info *info, struct fb_cursor *cursor);

#define FBCON_ATTRIBUTE_UNDERLINE 1

#define FBCON_ATTRIBUTE_REVERSE   2

#define FBCON_ATTRIBUTE_BOLD      4

static inline int real_y(struct display *p, int ypos)

{

        int rows = p->vrows;

        ypos += p->yscroll;

        return ypos < rows ? ypos : ypos - rows;

}

static inline int get_attribute(struct fb_info *info, u16 c)

{

        int attribute = 0;

        if (fb_get_color_depth(&info->var, &info->fix) == 1) {

                if (attr_underline(c))

                        attribute |= FBCON_ATTRIBUTE_UNDERLINE;

                if (attr_reverse(c))

                        attribute |= FBCON_ATTRIBUTE_REVERSE;

                if (attr_bold(c))

                        attribute |= FBCON_ATTRIBUTE_BOLD;

        }

        return attribute;

}

#define FBCON_SWAP(i,r,v) ({ \

        typeof(r) _r = (r);  \

        typeof(v) _v = (v);  \

        (void) (&_r == &_v); \

        (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; })

#ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION

extern void fbcon_set_rotate(struct fbcon_ops *ops);

#else

#define fbcon_set_rotate(x) do {} while(0)

#endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */

#endif /* _VIDEO_FBCON_H */