Added a simple renderer

README

@@ -10,6 +10,20 @@ font8x8_latin.h contains unicode points U+0000 - U+00FF
 Author: Daniel Hepper <[email protected]>
 License: Public Domain
 
+Renderer
+========
+To visualize the font, a simple renderer is included in render.c
+
+    $ gcc render.c -o render
+    $ ./render 65
+      XX    
+     XXXX   
+    XX  XX  
+    XX  XX  
+    XXXXXX  
+    XX  XX  
+    XX  XX
+
 Credits
 =======
 These header files are directly derived from an assembler file fetched from:

render.c

@@ -0,0 +1,38 @@
+#include <stdio.h>
+
+#include "font8x8_basic.h"
+
+void usage(char *exec) {
+    printf("Usage: %s <char_code>\n", exec);
+    printf("       <char_code> Decimal character code between 0 and 127\n");
+}
+
+void render(char *bitmap) {
+    int x,y;
+    int set;
+    int mask;
+    for (x=0; x < 8; x++) {
+        for (y=0; y < 8; y++) {
+            set = bitmap[x] & 1 << y;
+            printf("%c", set ? 'X' : ' ');
+        }
+        printf("\n");
+    }
+}
+
+int main(int argc, char **argv) {
+    int ord;
+    if (argc != 2) {
+        usage(argv[0]);
+        return 1;
+    }
+    ord = atoi(argv[1]);
+    if (ord > 127 || ord < 0) {
+        usage(argv[0]);
+        return 2;
+    }
+    char *bitmap = font8x8_basic[ord];
+
+    render(bitmap);
+    return 0;
+}