From 6cc50e1c5b57180fd37a31282000f43859b0fe73 Mon Sep 17 00:00:00 2001 From: "Antonino A. Daplas" Date: Tue, 8 Nov 2005 21:39:11 -0800 Subject: [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/console/fbcon_rotate.h | 102 +++++++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) create mode 100644 drivers/video/console/fbcon_rotate.h (limited to 'drivers/video/console/fbcon_rotate.h') diff --git a/drivers/video/console/fbcon_rotate.h b/drivers/video/console/fbcon_rotate.h new file mode 100644 index 000000000000..6cc27d8e5d45 --- /dev/null +++ b/drivers/video/console/fbcon_rotate.h @@ -0,0 +1,102 @@ +/* + * linux/drivers/video/console/fbcon_rotate.h -- Software Display Rotation + * + * Copyright (C) 2005 Antonino Daplas + * + * 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 _FBCON_ROTATE_H +#define _FBCON_ROTATE_H + +#define FNTCHARCNT(fd) (((int *)(fd))[-3]) + +#define GETVYRES(s,i) ({ \ + (s == SCROLL_REDRAW || s == SCROLL_MOVE) ? \ + (i)->var.yres : (i)->var.yres_virtual; }) + +#define GETVXRES(s,i) ({ \ + (s == SCROLL_REDRAW || s == SCROLL_MOVE || !(i)->fix.xpanstep) ? \ + (i)->var.xres : (i)->var.xres_virtual; }) + +/* + * The bitmap is always big endian + */ +#if defined(__LITTLE_ENDIAN) +#define FBCON_BIT(b) (7 - (b)) +#else +#define FBCON_BIT(b) (b) +#endif + +static inline int pattern_test_bit(u32 x, u32 y, u32 pitch, const char *pat) +{ + u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8; + + pat +=index; + return (test_bit(FBCON_BIT(bit), (void *)pat)); +} + +static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat) +{ + u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8; + + pat += index; + set_bit(FBCON_BIT(bit), (void *)pat); +} + +static inline void rotate_ud(const char *in, char *out, u32 width, u32 height) +{ + int i, j; + int shift = width % 8; + + width = (width + 7) & ~7; + + for (i = 0; i < height; i++) { + for (j = 0; j < width; j++) { + if (pattern_test_bit(j, i, width, in)) + pattern_set_bit(width - (1 + j + shift), + height - (1 + i), + width, out); + } + + } +} + +static inline void rotate_cw(const char *in, char *out, u32 width, u32 height) +{ + int i, j, h = height, w = width; + int shift = (8 - (height % 8)) & 7; + + width = (width + 7) & ~7; + height = (height + 7) & ~7; + + for (i = 0; i < h; i++) { + for (j = 0; j < w; j++) { + if (pattern_test_bit(j, i, width, in)) + pattern_set_bit(height - 1 - i - shift, j, + height, out); + + } + } +} + +static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height) +{ + int i, j, h = height, w = width; + int shift = width % 8; + + width = (width + 7) & ~7; + height = (height + 7) & ~7; + + for (i = 0; i < h; i++) { + for (j = 0; j < w; j++) { + if (pattern_test_bit(j, i, width, in)) + pattern_set_bit(i, width - 1 - j - shift, + height, out); + } + } +} + +#endif -- cgit v1.2.2