Rework the pixel computation to use areas

This changes the displayio pixel computation from per-pixel to
per-area. This is precursor work to updating portions of the screen
(#1169). It should provide mild speedups because bounds checks are
done once per area rather than once per pixel. Filling by area also
allows TileGrid to maintain a row-associative fill pattern even when
the display's refresh is orthogonal to it.

1 files changed, 3 insertions, 5 deletions

diff --git a/shared-module/displayio/TileGrid.h b/shared-module/displayio/TileGrid.h
index 59645553d..6157dfbe8 100644
--- a/shared-module/displayio/TileGrid.h
+++ b/shared-module/displayio/TileGrid.h
@@ -31,18 +31,16 @@
 #include <stdint.h>
 
 #include "py/obj.h"
+#include "shared-module/displayio/area.h"
 
 typedef struct {
     mp_obj_base_t base;
     mp_obj_t bitmap;
     mp_obj_t pixel_shader;
-    uint16_t x;
-    uint16_t y;
+    displayio_area_t area;
     uint16_t bitmap_width_in_tiles;
     uint16_t width_in_tiles;
     uint16_t height_in_tiles;
-    uint16_t total_width;
-    uint16_t total_height;
     uint16_t tile_width;
     uint16_t tile_height;
     uint16_t top_left_x;
@@ -52,7 +50,7 @@ typedef struct {
     bool inline_tiles;
 } displayio_tilegrid_t;
 
-bool displayio_tilegrid_get_pixel(displayio_tilegrid_t *self, int16_t x, int16_t y, uint16_t *pixel);
+bool displayio_tilegrid_get_area(displayio_tilegrid_t *self, displayio_buffer_transform_t* transform, displayio_area_t* area, uint32_t* mask, uint32_t *buffer);
 bool displayio_tilegrid_needs_refresh(displayio_tilegrid_t *self);
 void displayio_tilegrid_finish_refresh(displayio_tilegrid_t *self);