/* * 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.
*/
/* * This is the interface between the low-level console driver and the * low-level frame buffer device
*/
struct fbcon_display { /* Filled in by the low-level console driver */ const u_char *fontdata; int userfont; /* != 0 if fontdata kmalloc()ed */ #ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
u_short scrollmode; /* Scroll Method, use fb_scrollmode() */ #endif
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; conststruct 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, int fb, int bg); void (*putcs)(struct vc_data *vc, struct fb_info *info, constunsignedshort *s, int count, int yy, int xx, int fg, int bg); void (*clear_margins)(struct vc_data *vc, struct fb_info *info, int color, int bottom_only); void (*cursor)(struct vc_data *vc, struct fb_info *info, bool enable, 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 delayed_work cursor_work; /* Cursor timer */ struct fb_cursor cursor_state; struct fbcon_display *p; struct fb_info *info; int currcon; /* Current VC. */ int cur_blink_jiffies; int cursor_flash; int cursor_reset; int blank_state; int graphics; int save_graphics; /* for debug enter/leave */ bool initialized; int rotate; int cur_rotate; char *cursor_data;
u8 *fontbuffer;
u8 *fontdata;
u8 *cursor_src;
u32 cursor_size;
u32 fd_size;
}; /* * Attribute Decoding
*/
/* 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) *
*/
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