Split console into two pages

src/hulk/fb.d

@@ -199,6 +199,34 @@ struct Fb
                 (m_stride * height));
     }
 
+    /**
+     * Copy a rectangle in the framebuffer.
+     *
+     * @param sx X coordinate of left of source rectangle.
+     * @param sy Y coordinate of top of source rectangle.
+     * @param width Width of rectangle to copy.
+     * @param height Height of rectangle to copy.
+     * @param dx X coordinate of left of destination rectangle.
+     * @param dy Y coordinate of top of destination rectangle.
+     */
+    static void copy_rect(size_t sx, size_t sy, size_t width, size_t height,
+            size_t dx, size_t dy)
+    {
+        size_t dest_buffer_index = buffer_index(dx, dy);
+        size_t src_buffer_index = buffer_index(sx, sy);
+        for (size_t y = 0u; y < height; y++)
+        {
+            memcpy32(&m_buffer1[dest_buffer_index],
+                     &m_buffer1[src_buffer_index],
+                     width);
+            memcpy32(&m_device_buffer[dest_buffer_index],
+                     &m_buffer1[dest_buffer_index],
+                     width);
+            dest_buffer_index += m_stride;
+            src_buffer_index += m_stride;
+        }
+    }
+
     /**
      * Return the buffer index for the given X and Y coordinates.
      *