LXR linux/drivers/video/console/fbcon

   1/*
   2 *  linux/drivers/video/console/fbcon_rotate.h -- Software Display Rotation
   3 *
   4 *      Copyright (C) 2005 Antonino Daplas <adaplas@pol.net>
   5 *
   6 *  This file is subject to the terms and conditions of the GNU General Public
   7 *  License.  See the file COPYING in the main directory of this archive
   8 *  for more details.
   9 */
  10
  11#ifndef _FBCON_ROTATE_H
  12#define _FBCON_ROTATE_H
  13
  14#define GETVYRES(s,i) ({                           \
  15        (s == SCROLL_REDRAW || s == SCROLL_MOVE) ? \
  16        (i)->var.yres : (i)->var.yres_virtual; })
  17
  18#define GETVXRES(s,i) ({                           \
  19        (s == SCROLL_REDRAW || s == SCROLL_MOVE || !(i)->fix.xpanstep) ? \
  20        (i)->var.xres : (i)->var.xres_virtual; })
  21
  22
  23static inline int pattern_test_bit(u32 x, u32 y, u32 pitch, const char *pat)
  24{
  25        u32 tmp = (y * pitch) + x, index = tmp / 8,  bit = tmp % 8;
  26
  27        pat +=index;
  28        return (*pat) & (0x80 >> bit);
  29}
  30
  31static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat)
  32{
  33        u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
  34
  35        pat += index;
  36
  37        (*pat) |= 0x80 >> bit;
  38}
  39
  40static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)
  41{
  42        int i, j;
  43        int shift = (8 - (width % 8)) & 7;
  44
  45        width = (width + 7) & ~7;
  46
  47        for (i = 0; i < height; i++) {
  48                for (j = 0; j < width - shift; j++) {
  49                        if (pattern_test_bit(j, i, width, in))
  50                                pattern_set_bit(width - (1 + j + shift),
  51                                                height - (1 + i),
  52                                                width, out);
  53                }
  54
  55        }
  56}
  57
  58static inline void rotate_cw(const char *in, char *out, u32 width, u32 height)
  59{
  60        int i, j, h = height, w = width;
  61        int shift = (8 - (height % 8)) & 7;
  62
  63        width = (width + 7) & ~7;
  64        height = (height + 7) & ~7;
  65
  66        for (i = 0; i < h; i++) {
  67                for (j = 0; j < w; j++) {
  68                        if (pattern_test_bit(j, i, width, in))
  69                                pattern_set_bit(height - 1 - i - shift, j,
  70                                                height, out);
  71
  72                }
  73        }
  74}
  75
  76static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height)
  77{
  78        int i, j, h = height, w = width;
  79        int shift = (8 - (width % 8)) & 7;
  80
  81        width = (width + 7) & ~7;
  82        height = (height + 7) & ~7;
  83
  84        for (i = 0; i < h; i++) {
  85                for (j = 0; j < w; j++) {
  86                        if (pattern_test_bit(j, i, width, in))
  87                                pattern_set_bit(i, width - 1 - j - shift,
  88                                                height, out);
  89                }
  90        }
  91}
  92
  93extern void fbcon_rotate_cw(struct fbcon_ops *ops);
  94extern void fbcon_rotate_ud(struct fbcon_ops *ops);
  95extern void fbcon_rotate_ccw(struct fbcon_ops *ops);
  96#endif
  97