Added simple pixel graphics

Signed-off-by: Cestmir Houska <czestmyr@gmail.com>

Makefile

@@ -1,9 +1,9 @@
 CC=bcc
-CFLAGS=-Md -W
+CFLAGS=-Md -W -O
 
 all: brmbar.c
 #	gcc -Wall brmbar.c dataio.c -o brmbar
-	bcc -Md -W brmbar.c dataio.c -o brmbar.com
+	bcc $(CFLAGS) brmbar.c dataio.c gfx.c -o brmbar.com
 
 clean:
 	rm -f brmbar.com brmbar barcodes.svg

gfx.c

@@ -0,0 +1,35 @@
+#include "gfx.h"
+
+void init_graphics() {
+#asm
+    mov al, #0x13
+    mov ah, #0x0
+    int 0x10
+#endasm
+}
+
+void put_pixel(x, y, color)
+    int x;
+    int y;
+    char color;
+{
+    x = x + y*320;
+#asm
+    mov ax, #0xa000
+    mov es, ax
+    mov al, _put_pixel.color[bp]
+    mov di, _put_pixel.x[bp]
+    seg es
+    mov [di], al
+#endasm
+
+}
+
+void deinit_graphics() {
+#asm
+    mov al, #0x12
+    mov ah, #0x0
+    int 0x10
+#endasm
+}
+

gfx.h

@@ -0,0 +1,14 @@
+#ifndef _BRMBAR_GRAPHIX_H_
+#define _BRMBAR_GRAPHIX_H_
+
+#define COL_WHITE 15
+#define COL_BLACK 0
+
+extern void init_graphics();
+
+extern void put_pixel(x, y, color);
+
+extern void deinit_graphics();
+
+#endif
+