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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/video/console/fbcon_rotate.h
Initial import
Diffstat (limited to 'drivers/video/console/fbcon_rotate.h')
-rw-r--r--drivers/video/console/fbcon_rotate.h96
1 files changed, 96 insertions, 0 deletions
diff --git a/drivers/video/console/fbcon_rotate.h b/drivers/video/console/fbcon_rotate.h
new file mode 100644
index 000000000..e233444cd
--- /dev/null
+++ b/drivers/video/console/fbcon_rotate.h
@@ -0,0 +1,96 @@
+/*
+ * linux/drivers/video/console/fbcon_rotate.h -- Software Display Rotation
+ *
+ * Copyright (C) 2005 Antonino Daplas <adaplas@pol.net>
+ *
+ * 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 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; })
+
+
+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 (*pat) & (0x80 >> bit);
+}
+
+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;
+
+ (*pat) |= 0x80 >> bit;
+}
+
+static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)
+{
+ int i, j;
+ int shift = (8 - (width % 8)) & 7;
+
+ width = (width + 7) & ~7;
+
+ for (i = 0; i < height; i++) {
+ for (j = 0; j < width - shift; 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 = (8 - (width % 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(i, width - 1 - j - shift,
+ height, out);
+ }
+ }
+}
+
+extern void fbcon_rotate_cw(struct fbcon_ops *ops);
+extern void fbcon_rotate_ud(struct fbcon_ops *ops);
+extern void fbcon_rotate_ccw(struct fbcon_ops *ops);
+#endif