/* * 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 <linux/workqueue.h> #include <asm/io.h> /* * This is the interface between the low-level console driver and the * low-level frame buffer device */ struct fbcon_display { … }; struct fbcon_ops { … }; /* * Attribute Decoding */ /* Color */ #define attr_fgcol(fgshift,s) … #define attr_bgcol(bgshift,s) … /* Monochrome */ #define attr_bold(s) … #define attr_reverse(s) … #define attr_underline(s) … #define attr_blink(s) … static inline int mono_col(const struct fb_info *info) { … } static inline int attr_col_ec(int shift, struct vc_data *vc, struct fb_info *info, int is_fg) { … } #define attr_bgcol_ec(bgshift, vc, info) … #define attr_fgcol_ec(fgshift, vc, info) … /* * 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 … #define SCROLL_PAN_MOVE … #define SCROLL_WRAP_MOVE … #define SCROLL_REDRAW … #define SCROLL_PAN_REDRAW … static inline u_short fb_scrollmode(struct fbcon_display *fb) { … } #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 … #define FBCON_ATTRIBUTE_REVERSE … #define FBCON_ATTRIBUTE_BOLD … static inline int real_y(struct fbcon_display *p, int ypos) { … } static inline int get_attribute(struct fb_info *info, u16 c) { … } #define FBCON_SWAP(i,r,v) … #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION extern void fbcon_set_rotate(struct fbcon_ops *ops); #else #define fbcon_set_rotate … #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */ #endif /* _VIDEO_FBCON_H */
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