drivers/video/console/fbcon_rotate.h

   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 FNTCHARCNT(fd)  (((int *)(fd))[-3])
  15
  16 #define GETVYRES(s,i) ({                           \
  17         (s == SCROLL_REDRAW || s == SCROLL_MOVE) ? \
  18         (i)->var.yres : (i)->var.yres_virtual; })
  19
  20 #define GETVXRES(s,i) ({                           \
  21         (s == SCROLL_REDRAW || s == SCROLL_MOVE || !(i)->fix.xpanstep) ? \
  22         (i)->var.xres : (i)->var.xres_virtual; })
  23
  24
  25 static inline int pattern_test_bit(u32 x, u32 y, u32 pitch, const char *pat)
  26 {
  27         u32 tmp = (y * pitch) + x, index = tmp / 8,  bit = tmp % 8;
  28
  29         pat +=index;
  30         return (*pat) & (0x80 >> bit);
  31 }
  32
  33 static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat)
  34 {
  35         u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
  36
  37         pat += index;
  38
  39         (*pat) |= 0x80 >> bit;
  40 }
  41
  42 static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)
  43 {
  44         int i, j;
  45         int shift = (8 - (width % 8)) & 7;
  46
  47         width = (width + 7) & ~7;
  48
  49         for (i = 0; i < height; i++) {
  50                 for (j = 0; j < width; j++) {
  51                         if (pattern_test_bit(j, i, width, in))
  52                                 pattern_set_bit(width - (1 + j + shift),
  53                                                 height - (1 + i),
  54                                                 width, out);
  55                 }
  56
  57         }
  58 }
  59
  60 static inline void rotate_cw(const char *in, char *out, u32 width, u32 height)
  61 {
  62         int i, j, h = height, w = width;
  63         int shift = (8 - (height % 8)) & 7;
  64
  65         width = (width + 7) & ~7;
  66         height = (height + 7) & ~7;
  67
  68         for (i = 0; i < h; i++) {
  69                 for (j = 0; j < w; j++) {
  70                         if (pattern_test_bit(j, i, width, in))
  71                                 pattern_set_bit(height - 1 - i - shift, j,
  72                                                 height, out);
  73
  74                 }
  75         }
  76 }
  77
  78 static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height)
  79 {
  80         int i, j, h = height, w = width;
  81         int shift = (8 - (width % 8)) & 7;
  82
  83         width = (width + 7) & ~7;
  84         height = (height + 7) & ~7;
  85
  86         for (i = 0; i < h; i++) {
  87                 for (j = 0; j < w; j++) {
  88                         if (pattern_test_bit(j, i, width, in))
  89                                 pattern_set_bit(i, width - 1 - j - shift,
  90                                                 height, out);
  91                 }
  92         }
  93 }
  94
  95 extern void fbcon_rotate_cw(struct fbcon_ops *ops);
  96 extern void fbcon_rotate_ud(struct fbcon_ops *ops);
  97 extern void fbcon_rotate_ccw(struct fbcon_ops *ops);
  98 #endif