* Added switch to control output font size, and updated documentation

accordingly

doc/img2txt.1

@@ -11,6 +11,14 @@ img2txt \- convert images to various text-based coloured files
 .B \-H
 .I height
 ]
+[
+.B \-x
+.I font-width
+]
+[
+.B \-y
+.I font-height
+]
 .PD 0
 .IP
 .PD
@@ -60,6 +68,12 @@ Change output column count. If not given, the default is set to 60.
 .B \-H, \-\-height=<height>
 Change output line count. If not given, the height is computed to match correct aspect ratio.
 .TP
+.B \-x, \-\-font-width=<width>
+Change output font width. If not given, the default is set to 6. This value will be used for computing aspect ratio.
+.TP
+.B \-y, \-\-font-height=<height>
+Change output font height. If not given, the default is set to 10. This value will be used for computing aspect ratio.
+.TP
 .B \-b, \-\-brightness=<brightness>
 Change image brightness. Default to 1.0.
 .TP

src/img2txt.c

@@ -49,6 +49,8 @@ static void usage(int argc, char **argv)
     fprintf(stderr, "  -v, --version\t\t\tVersion of the program\n");
     fprintf(stderr, "  -W, --width=WIDTH\t\tWidth of resulting image\n");
     fprintf(stderr, "  -H, --height=HEIGHT\t\tHeight of resulting image\n");
+    fprintf(stderr, "  -x, --font-width=WIDTH\t\tWidth of output font\n");
+    fprintf(stderr, "  -y, --font-height=HEIGHT\t\tHeight of output font\n");
     fprintf(stderr, "  -b, --brightness=BRIGHTNESS\tBrightness of resulting image\n");
     fprintf(stderr, "  -c, --contrast=CONTRAST\tContrast of resulting image\n");
     fprintf(stderr, "  -g, --gamma=GAMMA\t\tGamma of resulting image\n");
@@ -96,7 +98,7 @@ int main(int argc, char **argv)
     void *export;
     unsigned long int len;
     struct image *i;
-    unsigned int cols = 0, lines = 0;
+    unsigned int cols = 0, lines = 0, font_width = 6, font_height = 10;
     char *format = NULL;
     char *dither = NULL;
     float gamma = -1, brightness = -1, contrast = -1;
@@ -115,15 +117,17 @@ int main(int argc, char **argv)
         {
             { "width",       1, NULL, 'W' },
             { "height",      1, NULL, 'H' },
+            { "font-width",  1, NULL, 'x' },
+            { "font-height", 1, NULL, 'y' },
             { "format",      1, NULL, 'f' },
             { "dither",      1, NULL, 'd' },
             { "gamma",       1, NULL, 'g' },
             { "brightness",  1, NULL, 'b' },
             { "contrast",    1, NULL, 'c' },
             { "help",        0, NULL, 'h' },
-            { "version",        0, NULL, 'v' },
+            { "version",     0, NULL, 'v' },
         };
-        int c = mygetopt(argc, argv, "W:H:f:d:g:b:c:h:v", long_options, &option_index);
+        int c = mygetopt(argc, argv, "W:H:f:d:g:b:c:h:v:x:y:", long_options, &option_index);
         if(c == -1)
             break;
 
@@ -135,6 +139,12 @@ int main(int argc, char **argv)
         case 'H': /* --height */
             lines = atoi(myoptarg);
             break;
+        case 'x': /* --width */
+            font_width = atoi(myoptarg);
+            break;
+        case 'y': /* --height */
+            font_height = atoi(myoptarg);
+            break;
         case 'f': /* --format */
             format = myoptarg;
             break;
@@ -184,15 +194,15 @@ int main(int argc, char **argv)
     if(!cols && !lines)
     {
         cols = 60;
-        lines = cols * i->h * 6 / i->w / 10;
+        lines = cols * i->h * font_width / i->w / font_height;
     }
     else if(cols && !lines)
     {
-        lines = cols * i->h * 6 / i->w / 10;
+        lines = cols * i->h * font_width / i->w / font_height;
     }
     else if(!cols && lines)
     {
-        cols = lines * i->w * 10 / i->h / 6;
+        cols = lines * i->w * font_height / i->h / font_width;
     }