Add partial display update support.

Different operations to the display tree have different costs. Be
aware of these costs when optimizing your code.
* Changing tiles indices in a TileGrid will update an area
covering them all.
* Changing a palette will refresh every object that references it.
* Moving a TileGrid will update both where it was and where it moved to.
* Adding something to a Group will refresh each individual area it
covers.
* Removing things from a Group will refresh one area that covers all
previous locations. (Not separate areas like add.)
* Setting a new top level Group will refresh the entire display.

Only TileGrid moves are optimized for overlap. All other overlaps
cause sending of duplicate pixels.

This also adds flip_x, flip_y and transpose_xy to TileGrid. They
change the direction of the pixels but not the location.

Fixes #1169. Fixes #1705. Fixes #1923.

1 files changed, 8 insertions, 0 deletions

diff --git a/shared-bindings/displayio/TileGrid.h b/shared-bindings/displayio/TileGrid.h
index 15a71b53b..1f9995a94 100644
--- a/shared-bindings/displayio/TileGrid.h
+++ b/shared-bindings/displayio/TileGrid.h
@@ -42,6 +42,14 @@ void common_hal_displayio_tilegrid_set_y(displayio_tilegrid_t *self, mp_int_t y)
 mp_obj_t common_hal_displayio_tilegrid_get_pixel_shader(displayio_tilegrid_t *self);
 void common_hal_displayio_tilegrid_set_pixel_shader(displayio_tilegrid_t *self, mp_obj_t pixel_shader);
 
+
+bool common_hal_displayio_tilegrid_get_flip_x(displayio_tilegrid_t *self);
+void common_hal_displayio_tilegrid_set_flip_x(displayio_tilegrid_t *self, bool flip_x);
+bool common_hal_displayio_tilegrid_get_flip_y(displayio_tilegrid_t *self);
+void common_hal_displayio_tilegrid_set_flip_y(displayio_tilegrid_t *self, bool flip_y);
+bool common_hal_displayio_tilegrid_get_transpose_xy(displayio_tilegrid_t *self);
+void common_hal_displayio_tilegrid_set_transpose_xy(displayio_tilegrid_t *self, bool transpose_xy);
+
 uint16_t common_hal_displayio_tilegrid_get_width(displayio_tilegrid_t *self);
 uint16_t common_hal_displayio_tilegrid_get_height(displayio_tilegrid_t *self);