Fixed auto scaling and added X8 on Linux

Closes #51
Closes #52

src/native/x11/X11MiniFB.c

@@ -515,6 +515,41 @@ static void scale_4x(unsigned int* dest, unsigned int* source, int width, int he
     }
 }
 
+
+#define write_8(offset) \
+    dest[(width * offset) + 0] = t; \
+    dest[(width * offset) + 1] = t; \
+    dest[(width * offset) + 2] = t; \
+    dest[(width * offset) + 3] = t; \
+    dest[(width * offset) + 4] = t; \
+    dest[(width * offset) + 5] = t; \
+    dest[(width * offset) + 6] = t; \
+    dest[(width * offset) + 7] = t;
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+static void scale_8x(unsigned int* dest, unsigned int* source, int width, int height, int scale) {
+    int x, y;
+    for (y = 0; y < height; y += scale) {
+        for (x = 0; x < width; x += scale) {
+            const unsigned int t = *source++;
+
+            write_8(0);
+            write_8(1);
+            write_8(2);
+            write_8(3);
+            write_8(4);
+            write_8(5);
+            write_8(6);
+            write_8(7);
+
+            dest += scale;
+        }
+
+        dest += width * (scale - 1);
+    }
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
 void mfb_update_with_buffer(void* window_info, void* buffer)
@@ -539,6 +574,11 @@ void mfb_update_with_buffer(void* window_info, void* buffer)
                 scale_4x(info->draw_buffer, buffer, width, height, scale); 
                 break;
             }
+
+            case 8: {
+                scale_8x(info->draw_buffer, buffer, width, height, scale); 
+                break;
+            }
         }
 
         XPutImage(s_display, info->window, s_gc, info->ximage, 0, 0, 0, 0, width, height);

src/os/unix/mod.rs

@@ -374,6 +374,7 @@ impl Window {
             Scale::X1 => 1,
             Scale::X2 => 2,
             Scale::X4 => 4,
+            Scale::X8 => 8,
             Scale::FitScreen => {
                 let wh: u32 = mfb_get_screen_size();
                 let screen_x = (wh >> 16) as i32;
@@ -387,15 +388,15 @@ impl Window {
                     let w = width as i32 * (scale + 1);
                     let h = height as i32 * (scale + 1);
 
-                    if w > screen_x || h > screen_y {
+                    if w >= screen_x || h >= screen_y {
                         break;
                     }
 
                     scale *= 2;
                 }
 
-                if scale >= 4 {
+                if scale >= 8 {
-                	4
+                	8
                 } else {
                 	scale
 				}