[PATCH] fbcon: Console Rotation - Add support to rotate font bitmap
Add support to rotate the font bitmap. To save on processing time, the entire fontdata will be rotated on a console switch, then stored in a buffer private to fbcon. To further save on processing, the fontdata will only be rotated if the font has changed or if the angle of rotation has changed. Only a single copy of the rotated fontdata will be kept. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>hifive-unleashed-5.1
Antonino A. Daplas
Linus Torvalds
parent
9c44e5f6c2
commit
6cc50e1c5b
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@ -31,6 +31,9 @@ obj-$(CONFIG_FRAMEBUFFER_CONSOLE) += fbcon.o bitblit.o font.o softcursor.o
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ifeq ($(CONFIG_FB_TILEBLITTING),y)
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obj-$(CONFIG_FRAMEBUFFER_CONSOLE) += tileblit.o
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endif
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ifeq ($(CONFIG_FRAMEBUFFER_CONSOLE_ROTATION),y)
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obj-$(CONFIG_FRAMEBUFFER_CONSOLE) += fbcon_rotate.o
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endif
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obj-$(CONFIG_FB_STI) += sticore.o font.o
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@ -215,7 +215,11 @@ static inline int get_attribute(struct fb_info *info, u16 c)
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(void) (&_r == &_v); \
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(i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; })
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#ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
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extern void fbcon_set_rotate(struct fbcon_ops *ops);
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#else
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#define fbcon_set_rotate(x) do {} while(0)
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#endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
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#endif /* _VIDEO_FBCON_H */
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@ -0,0 +1,105 @@
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/*
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* linux/drivers/video/console/fbcon_rotate.c -- Software Rotation
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*
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* Copyright (C) 2005 Antonino Daplas <adaplas @pol.net>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/fb.h>
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#include <linux/vt_kern.h>
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#include <linux/console.h>
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#include <asm/types.h>
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#include "fbcon.h"
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#include "fbcon_rotate.h"
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static int fbcon_rotate_font(struct fb_info *info, struct vc_data *vc,
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struct display *p)
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{
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struct fbcon_ops *ops = info->fbcon_par;
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int len, err = 0;
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int s_cellsize, d_cellsize, i;
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const u8 *src;
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u8 *dst;
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if (vc->vc_font.data == ops->fontdata &&
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p->con_rotate == ops->cur_rotate)
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goto finished;
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src = ops->fontdata = vc->vc_font.data;
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ops->cur_rotate = p->con_rotate;
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len = (!p->userfont) ? 256 : FNTCHARCNT(src);
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s_cellsize = ((vc->vc_font.width + 7)/8) *
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vc->vc_font.height;
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d_cellsize = s_cellsize;
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if (ops->rotate == FB_ROTATE_CW ||
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ops->rotate == FB_ROTATE_CCW)
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d_cellsize = ((vc->vc_font.height + 7)/8) *
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vc->vc_font.width;
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if (info->fbops->fb_sync)
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info->fbops->fb_sync(info);
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if (ops->fd_size < d_cellsize * len) {
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dst = kmalloc(d_cellsize * len, GFP_KERNEL);
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if (dst == NULL) {
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err = -ENOMEM;
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goto finished;
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}
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ops->fd_size = d_cellsize * len;
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kfree(ops->fontbuffer);
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ops->fontbuffer = dst;
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}
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dst = ops->fontbuffer;
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memset(dst, 0, ops->fd_size);
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switch (ops->rotate) {
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case FB_ROTATE_UD:
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for (i = len; i--; ) {
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rotate_ud(src, dst, vc->vc_font.width,
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vc->vc_font.height);
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src += s_cellsize;
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dst += d_cellsize;
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}
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break;
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case FB_ROTATE_CW:
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for (i = len; i--; ) {
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rotate_cw(src, dst, vc->vc_font.width,
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vc->vc_font.height);
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src += s_cellsize;
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dst += d_cellsize;
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}
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break;
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case FB_ROTATE_CCW:
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for (i = len; i--; ) {
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rotate_ccw(src, dst, vc->vc_font.width,
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vc->vc_font.height);
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src += s_cellsize;
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dst += d_cellsize;
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}
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break;
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}
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finished:
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return err;
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}
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void fbcon_set_rotate(struct fbcon_ops *ops)
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{
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ops->rotate_font = fbcon_rotate_font;
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}
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EXPORT_SYMBOL(fbcon_set_rotate);
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MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
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MODULE_DESCRIPTION("Console Rotation Support");
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MODULE_LICENSE("GPL");
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@ -0,0 +1,102 @@
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/*
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* linux/drivers/video/console/fbcon_rotate.h -- Software Display Rotation
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*
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* Copyright (C) 2005 Antonino Daplas <adaplas@pol.net>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#ifndef _FBCON_ROTATE_H
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#define _FBCON_ROTATE_H
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#define FNTCHARCNT(fd) (((int *)(fd))[-3])
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#define GETVYRES(s,i) ({ \
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(s == SCROLL_REDRAW || s == SCROLL_MOVE) ? \
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(i)->var.yres : (i)->var.yres_virtual; })
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#define GETVXRES(s,i) ({ \
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(s == SCROLL_REDRAW || s == SCROLL_MOVE || !(i)->fix.xpanstep) ? \
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(i)->var.xres : (i)->var.xres_virtual; })
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/*
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* The bitmap is always big endian
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*/
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#if defined(__LITTLE_ENDIAN)
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#define FBCON_BIT(b) (7 - (b))
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#else
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#define FBCON_BIT(b) (b)
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#endif
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static inline int pattern_test_bit(u32 x, u32 y, u32 pitch, const char *pat)
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{
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u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
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pat +=index;
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return (test_bit(FBCON_BIT(bit), (void *)pat));
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}
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static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat)
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{
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u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
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pat += index;
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set_bit(FBCON_BIT(bit), (void *)pat);
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}
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static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)
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{
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int i, j;
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int shift = width % 8;
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width = (width + 7) & ~7;
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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if (pattern_test_bit(j, i, width, in))
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pattern_set_bit(width - (1 + j + shift),
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height - (1 + i),
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width, out);
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}
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}
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}
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static inline void rotate_cw(const char *in, char *out, u32 width, u32 height)
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{
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int i, j, h = height, w = width;
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int shift = (8 - (height % 8)) & 7;
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width = (width + 7) & ~7;
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height = (height + 7) & ~7;
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for (i = 0; i < h; i++) {
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for (j = 0; j < w; j++) {
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if (pattern_test_bit(j, i, width, in))
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pattern_set_bit(height - 1 - i - shift, j,
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height, out);
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}
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}
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}
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static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height)
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{
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int i, j, h = height, w = width;
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int shift = width % 8;
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width = (width + 7) & ~7;
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height = (height + 7) & ~7;
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for (i = 0; i < h; i++) {
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for (j = 0; j < w; j++) {
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if (pattern_test_bit(j, i, width, in))
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pattern_set_bit(i, width - 1 - j - shift,
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height, out);
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}
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}
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}
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#endif
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