patch-2.1.67 linux/drivers/video/fbcon-cfb16.c

• Lines: 234
• Date: Tue Sep 16 02:29:31 1997
• Orig file: v2.1.66/linux/drivers/video/fbcon-cfb16.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.66/linux/drivers/video/fbcon-cfb16.c linux/drivers/video/fbcon-cfb16.c
@@ -0,0 +1,233 @@
+/*
+ *  linux/drivers/video/cfb16.c -- Low level frame buffer operations for 16 bpp
+ *				   packed pixels
+ *
+ *	Created 5 Apr 1997 by Geert Uytterhoeven
+ *
+ *  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.
+ */
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/console.h>
+#include <linux/string.h>
+#include <linux/config.h>
+#include <linux/fb.h>
+
+#include "fbcon.h"
+
+
+    /*
+     *  Prototypes
+     */
+
+static int open_cfb16(struct display *p);
+static void release_cfb16(void);
+static void bmove_cfb16(struct display *p, int sy, int sx, int dy, int dx,
+			int height, int width);
+static void clear_cfb16(struct vc_data *conp, struct display *p, int sy,
+			int sx, int height, int width);
+static void putc_cfb16(struct vc_data *conp, struct display *p, int c,
+		       int yy, int xx);
+static void putcs_cfb16(struct vc_data *conp, struct display *p,
+			const char *s, int count, int yy, int xx);
+static void rev_char_cfb16(struct display *p, int xx, int yy);
+
+
+    /*
+     *  `switch' for the low level operations
+     */
+
+static struct display_switch dispsw_cfb16 = {
+    open_cfb16, release_cfb16, bmove_cfb16, clear_cfb16, putc_cfb16,
+    putcs_cfb16, rev_char_cfb16
+};
+
+
+    /*
+     *  16 bpp packed pixels
+     */
+
+u_short packed16_cmap[16];
+
+static u_long tab_cfb16[] = {
+    0x00000000,0x0000ffff,0xffff0000,0xffffffff
+};
+
+static int open_cfb16(struct display *p)
+{
+    if (p->type != FB_TYPE_PACKED_PIXELS || p->var.bits_per_pixel != 16)
+	return -EINVAL;
+
+    p->next_line = p->var.xres_virtual<<1;
+    p->next_plane = 0;
+    MOD_INC_USE_COUNT;
+    return 0;
+}
+
+static void release_cfb16(void)
+{
+    MOD_DEC_USE_COUNT;
+}
+
+static void bmove_cfb16(struct display *p, int sy, int sx, int dy, int dx,
+			int height, int width)
+{
+    int bytes = p->next_line, linesize = bytes * p->fontheight, rows;
+    u_char *src,*dst;
+
+    if (sx == 0 && dx == 0 && width * 16 == bytes)
+	mymemmove(p->screen_base + dy * linesize,
+		  p->screen_base + sy * linesize,
+		  height * linesize);
+    else if (dy < sy || (dy == sy && dx < sx)) {
+	src = p->screen_base + sy * linesize + sx * 16;
+	dst = p->screen_base + dy * linesize + dx * 16;
+	for (rows = height * p->fontheight ; rows-- ;) {
+	    mymemmove(dst, src, width * 16);
+	    src += bytes;
+	    dst += bytes;
+	}
+    } else {
+	src = p->screen_base + (sy+height) * linesize + sx * 16 - bytes;
+	dst = p->screen_base + (dy+height) * linesize + dx * 16 - bytes;
+	for (rows = height * p->fontheight ; rows-- ;) {
+	    mymemmove(dst, src, width * 16);
+	    src -= bytes;
+	    dst -= bytes;
+	}
+    }
+}
+
+static void clear_cfb16(struct vc_data *conp, struct display *p, int sy,
+			int sx, int height, int width)
+{
+    u_char *dest0,*dest;
+    int bytes=p->next_line,lines=height * p->fontheight, rows, i;
+    u_long bgx;
+
+    dest = p->screen_base + sy * p->fontheight * bytes + sx * 16;
+
+    bgx = attr_bgcol_ec(p,conp);
+    bgx = packed16_cmap[bgx];
+    bgx |= (bgx << 16);
+
+    if (sx == 0 && width * 16 == bytes)
+	for (i = 0 ; i < lines * width ; i++) {
+	    ((u_long *)dest)[0]=bgx;
+	    ((u_long *)dest)[1]=bgx;
+	    ((u_long *)dest)[2]=bgx;
+	    ((u_long *)dest)[3]=bgx;
+	    dest+=16;
+	}
+    else {
+	dest0=dest;
+	for (rows = lines; rows-- ; dest0 += bytes) {
+	    dest=dest0;
+	    for (i = 0 ; i < width ; i++) {
+		((u_long *)dest)[0]=bgx;
+		((u_long *)dest)[1]=bgx;
+		((u_long *)dest)[2]=bgx;
+		((u_long *)dest)[3]=bgx;
+		dest+=16;
+	    }
+	}
+    }
+}
+
+static void putc_cfb16(struct vc_data *conp, struct display *p, int c, int yy,
+		       int xx)
+{
+    u_char *dest,*cdat;
+    int bytes=p->next_line,rows;
+    ulong eorx,fgx,bgx;
+
+    c &= 0xff;
+
+    dest = p->screen_base + yy * p->fontheight * bytes + xx * 16;
+    cdat = p->fontdata + c * p->fontheight;
+
+    fgx = attr_fgcol(p,conp);
+    fgx = packed16_cmap[fgx];
+    bgx = attr_bgcol(p,conp);
+    bgx = packed16_cmap[bgx];
+    fgx |= (fgx << 16);
+    bgx |= (bgx << 16);
+    eorx = fgx ^ bgx;
+
+    for (rows = p->fontheight ; rows-- ; dest += bytes) {
+	((u_long *)dest)[0]= (tab_cfb16[*cdat >> 6] & eorx) ^ bgx;
+	((u_long *)dest)[1]= (tab_cfb16[*cdat >> 4 & 0x3] & eorx) ^ bgx;
+	((u_long *)dest)[2]= (tab_cfb16[*cdat >> 2 & 0x3] & eorx) ^ bgx;
+	((u_long *)dest)[3]= (tab_cfb16[*cdat++ & 0x3] & eorx) ^ bgx;
+    }
+}
+
+static void putcs_cfb16(struct vc_data *conp, struct display *p, const char *s,
+			int count, int yy, int xx)
+{
+    u_char *cdat, c, *dest, *dest0;
+    int rows,bytes=p->next_line;
+    u_long eorx, fgx, bgx;
+
+    dest0 = p->screen_base + yy * p->fontheight * bytes + xx * 16;
+    fgx = attr_fgcol(p,conp);
+    fgx = packed16_cmap[fgx];
+    bgx = attr_bgcol(p,conp);
+    bgx = packed16_cmap[bgx];
+    fgx |= (fgx << 16);
+    bgx |= (bgx << 16);
+    eorx = fgx ^ bgx;
+    while (count--) {
+	c = *s++;
+	cdat = p->fontdata + c * p->fontheight;
+
+	for (rows = p->fontheight, dest = dest0; rows-- ; dest += bytes) {
+	    ((u_long *)dest)[0]= (tab_cfb16[*cdat >> 6] & eorx) ^ bgx;
+	    ((u_long *)dest)[1]= (tab_cfb16[*cdat >> 4 & 0x3] & eorx) ^ bgx;
+	    ((u_long *)dest)[2]= (tab_cfb16[*cdat >> 2 & 0x3] & eorx) ^ bgx;
+	    ((u_long *)dest)[3]= (tab_cfb16[*cdat++ & 0x3] & eorx) ^ bgx;
+	}
+	dest0+=16;
+    }
+}
+
+static void rev_char_cfb16(struct display *p, int xx, int yy)
+{
+    u_char *dest;
+    int bytes=p->next_line, rows;
+
+    dest = p->screen_base + yy * p->fontheight * bytes + xx * 16;
+    for (rows = p->fontheight ; rows-- ; dest += bytes) {
+	((u_long *)dest)[0] ^= 0xffffffff;
+	((u_long *)dest)[1] ^= 0xffffffff;
+	((u_long *)dest)[2] ^= 0xffffffff;
+	((u_long *)dest)[3] ^= 0xffffffff;
+    }
+}
+
+
+#ifdef MODULE
+int init_module(void)
+#else
+int fbcon_init_cfb16(void)
+#endif
+{
+    return(fbcon_register_driver(&dispsw_cfb16, 0));
+}
+
+#ifdef MODULE
+void cleanup_module(void)
+{
+    fbcon_unregister_driver(&dispsw_cfb16);
+}
+#endif /* MODULE */
+
+
+    /*
+     *  Visible symbols for modules
+     */
+
+EXPORT_SYMBOL(packed16_cmap);