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 23 static 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 31 static 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 40 static 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 58 static 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 76 static 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 93 extern void fbcon_rotate_cw(struct fbcon_ops *ops); 94 extern void fbcon_rotate_ud(struct fbcon_ops *ops); 95 extern void fbcon_rotate_ccw(struct fbcon_ops *ops); 96 #endif 97