patch-2.1.91 linux/drivers/video/fbcon-cfb4.c

• Lines: 209
• Date: Sat Mar 21 11:12:49 1998
• Orig file: v2.1.90/linux/drivers/video/fbcon-cfb4.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.90/linux/drivers/video/fbcon-cfb4.c linux/drivers/video/fbcon-cfb4.c
@@ -0,0 +1,208 @@
+/*
+ *  linux/drivers/video/cfb4.c -- Low level frame buffer operations for 4 bpp
+ *				  packed pixels
+ *
+ *	Created 26 Dec 1997 by Michael Schmitz
+ *	Based on the old macfb.c 4bpp code by Alan Cox
+ *
+ *  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"
+#include "fbcon-cfb4.h"
+
+
+    /*
+     *  4 bpp packed pixels
+     */
+
+    /*
+     *  IFF the font is even pixel aligned (that is to say each
+     *  character start is a byte start in the pixel pairs). That
+     *  avoids us having to mask bytes and means we won't be here
+     *  all week. On a MacII that matters _lots_
+     */
+
+static u16 nibbletab_cfb4[] = {
+    0x0000,0x000f,0x00f0,0x00ff,
+    0x0f00,0x0f0f,0x0ff0,0x0fff,
+    0xf000,0xf00f,0xf0f0,0xf0ff,
+    0xff00,0xff0f,0xfff0,0xffff
+};
+
+void fbcon_cfb4_setup(struct display *p)
+{
+    p->next_line = p->var.xres_virtual>>1;
+    p->next_plane = 0;
+}
+
+void fbcon_cfb4_bmove(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;
+	u8 *src,*dst;
+
+	if (sx == 0 && dx == 0 && width * 4 == 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 * 4;
+			dst = p->screen_base + dy * linesize + dx * 4;
+			for (rows = height * p->fontheight ; rows-- ;) {
+				mymemmove(dst, src, width * 4);
+				src += bytes;
+				dst += bytes;
+			}
+		}
+		else {
+			src = p->screen_base + (sy+height) * linesize + sx * 4
+				- bytes;
+			dst = p->screen_base + (dy+height) * linesize + dx * 4
+				- bytes;
+			for (rows = height * p->fontheight ; rows-- ;) {
+				mymemmove(dst, src, width * 4);
+				src -= bytes;
+				dst -= bytes;
+			}
+		}
+	}
+}
+
+void fbcon_cfb4_clear(struct vc_data *conp, struct display *p, int sy, int sx,
+		      int height, int width)
+{
+	u8 *dest0,*dest;
+	int bytes=p->next_line,lines=height * p->fontheight, rows, i;
+	u32 bgx;
+
+/*	if(p->screen_base!=0xFDD00020)
+		mac_boom(1);*/
+	dest = p->screen_base + sy * p->fontheight * bytes + sx * 4;
+
+	bgx=attr_bgcol_ec(p,conp);
+	bgx |= (bgx << 4);	/* expand the colour to 32bits */
+	bgx |= (bgx << 8);
+	bgx |= (bgx << 16);
+
+	if (sx == 0 && width * 4 == bytes) {
+		for (i = 0 ; i < lines * width ; i++) {
+			((u32 *)dest)[0]=bgx;
+			dest+=4;
+		}
+	} else {
+		dest0=dest;
+		for (rows = lines; rows-- ; dest0 += bytes) {
+			dest=dest0;
+			for (i = 0 ; i < width ; i++) {
+				/* memset ?? */
+				((u32 *)dest)[0]=bgx;
+				dest+=4;
+			}
+		}
+	}
+}
+
+void fbcon_cfb4_putc(struct vc_data *conp, struct display *p, int c, int yy,
+		     int xx)
+{
+	u8 *dest,*cdat;
+	int bytes=p->next_line,rows;
+	u32 eorx,fgx,bgx;
+
+	c &= 0xff;
+
+	dest = p->screen_base + yy * p->fontheight * bytes + xx * 4;
+	cdat = p->fontdata + c * p->fontheight;
+
+	fgx=15;/*attr_fgcol(p,conp)&0x0F;*/
+	bgx=attr_bgcol(p,conp)&0x0F;
+	fgx |= (fgx << 4);
+	fgx |= (fgx << 8);
+	bgx |= (bgx << 4);
+	bgx |= (bgx << 8);
+	eorx = fgx ^ bgx;
+
+	for (rows = p->fontheight ; rows-- ; dest += bytes) {
+		((u16 *)dest)[0]=
+			(nibbletab_cfb4[*cdat >> 4] & eorx) ^ bgx;
+		((u16 *)dest)[1]=
+			(nibbletab_cfb4[*cdat++ & 0xf] & eorx) ^ bgx;
+	}
+}
+
+void fbcon_cfb4_putcs(struct vc_data *conp, struct display *p, const char *s,
+		      int count, int yy, int xx)
+{
+	u8 *cdat, c, *dest, *dest0;
+	int rows,bytes=p->next_line;
+	u32 eorx, fgx, bgx;
+
+	dest0 = p->screen_base + yy * p->fontheight * bytes + xx * 4;
+	fgx=15/*attr_fgcol(p,conp)*/;
+	bgx=attr_bgcol(p,conp);
+	fgx |= (fgx << 4);
+	fgx |= (fgx << 8);
+	fgx |= (fgx << 16);
+	bgx |= (bgx << 4);
+	bgx |= (bgx << 8);
+	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) {
+			((u16 *)dest)[0]=
+			(nibbletab_cfb4[*cdat >> 4] & eorx) ^ bgx;
+			((u16 *)dest)[1]=
+			(nibbletab_cfb4[*cdat++ & 0xf] & eorx) ^ bgx;
+		}
+		dest0+=4;
+	}
+}
+
+void fbcon_cfb4_revc(struct display *p, int xx, int yy)
+{
+	u8 *dest;
+	int bytes=p->next_line, rows;
+
+	dest = p->screen_base + yy * p->fontheight * bytes + xx * 4;
+	for (rows = p->fontheight ; rows-- ; dest += bytes) {
+		((u32 *)dest)[0] ^= 0x0f0f0f0f;
+	}
+}
+
+
+    /*
+     *  `switch' for the low level operations
+     */
+
+struct display_switch fbcon_cfb4 = {
+    fbcon_cfb4_setup, fbcon_cfb4_bmove, fbcon_cfb4_clear, fbcon_cfb4_putc,
+    fbcon_cfb4_putcs, fbcon_cfb4_revc
+};
+
+
+    /*
+     *  Visible symbols for modules
+     */
+
+EXPORT_SYMBOL(fbcon_cfb4);
+EXPORT_SYMBOL(fbcon_cfb4_setup);
+EXPORT_SYMBOL(fbcon_cfb4_bmove);
+EXPORT_SYMBOL(fbcon_cfb4_clear);
+EXPORT_SYMBOL(fbcon_cfb4_putc);
+EXPORT_SYMBOL(fbcon_cfb4_putcs);
+EXPORT_SYMBOL(fbcon_cfb4_revc);