[vte/wip/sixels: 35/82] ring: Clean up a few comments relating to sixels

[Hans Petter Jansson <hansp src gnome org>]

commit b5e03d8c6ffd3d859599281232ae7eed31a667d4
Author: Hans Petter Jansson <hpj cl no>
Date:   Tue Jun 9 00:25:24 2020 +0200

    ring: Clean up a few comments relating to sixels

 src/ring.cc | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)
---
diff --git a/src/ring.cc b/src/ring.cc
index 28d7524a..35422f7f 100644
--- a/src/ring.cc
+++ b/src/ring.cc
@@ -103,7 +103,7 @@ Ring::~Ring()
 
        g_free (m_array);
 
-       /* Clear SIXEL images */
+       /* Clear sixel images */
        for (auto it = image_map->begin (); it != image_map->end (); ++it)
                delete it->second;
        image_map->clear();
@@ -606,7 +606,7 @@ Ring::reset()
         m_start = m_writable = m_end;
         m_cached_row_num = (row_t)-1;
 
-       /* Clear SIXEL images */
+       /* Clear sixel images */
        for (auto it = image_map->begin (); it != image_map->end (); ++it)
                delete it->second;
        image_map->clear();
@@ -1531,22 +1531,11 @@ Ring::append_image (cairo_surface_t *surface, gint pixelwidth, gint pixelheight,
        char_width = pixelwidth / width;
        char_height = pixelwidth / height;
 
-       /* composition */
        for (auto it = m_image_map->lower_bound (top); it != m_image_map->end (); ) {
                Image *current = it->second;
 
-               /* Combine two images if one's area contains another's area */
+               /* Delete images that are completely covered by this image */
                if (image->contains (*current)) {
-                       /*
-                        * Replace current image with new image
-                        *
-                        *  +--------------+
-                        *  |     new      |
-                        *  | ...........  |
-                        *  | : current :  |
-                        *  | :.........:  |
-                        *  +--------------+
-                        */
                         m_image_onscreen_resource_counter -= current->resource_size ();
 
                         /* We must advance the iterator before erasure */