A variety of displayio improvements

This changes a number of things in displayio:
* Introduces BuiltinFont and Glyph so the built in font can be used by libraries. For boards with
  a font it is available as board.TERMINAL_FONT. Fixes #1172
* Remove _load_row from Bitmap in favor of bitmap[] access. Index can be x/y tuple or overall index. Fixes #1191
* Add width and height properties to Bitmap.
* Add insert and [] access to Group. Fixes #1518
* Add index param to pop on Group.
* Terminal no longer takes unicode character info. It takes a BuiltinFont instead.
* Fix Terminal's handling of [###D vt100 commands used when up arrowing into repl history.
* Add x and y positions to Group plus scale as well.
* Add bitmap accessor for BuiltinFont

1 files changed, 8 insertions, 0 deletions

diff --git a/shared-module/displayio/TileGrid.c b/shared-module/displayio/TileGrid.c
index b90603afe..e4f40a5f7 100644
--- a/shared-module/displayio/TileGrid.c
+++ b/shared-module/displayio/TileGrid.c
@@ -40,9 +40,17 @@ void common_hal_displayio_tilegrid_construct(displayio_tilegrid_t *self, mp_obj_
     // Sprites will only have one tile so save a little memory by inlining values in the pointer.
     uint8_t inline_tiles = sizeof(uint8_t*);
     if (total_tiles <= inline_tiles) {
+        self->tiles = 0;
+        // Pack values into the pointer since there are only a few.
+        for (uint32_t i = 0; i < inline_tiles; i++) {
+            ((uint8_t*) &self->tiles)[i] = default_tile;
+        }
         self->inline_tiles = true;
     } else {
         self->tiles = (uint8_t*) m_malloc(total_tiles, false);
+        for (uint32_t i = 0; i < total_tiles; i++) {
+            self->tiles[i] = default_tile;
+        }
         self->inline_tiles = false;
     }
     self->bitmap_width_in_tiles = bitmap_width_in_tiles;