Minor tweaks based on Dan's feedback

4 files changed, 27 insertions, 41 deletions

diff --git a/shared-bindings/displayio/TileGrid.c b/shared-bindings/displayio/TileGrid.c
index 5d064ae10..6ba4914a0 100644
--- a/shared-bindings/displayio/TileGrid.c
+++ b/shared-bindings/displayio/TileGrid.c
@@ -249,8 +249,8 @@ const mp_obj_property_t displayio_tilegrid_flip_y_obj = {
 
 //|   .. attribute:: transpose_xy
 //|
-//|     If true, the TileGrid will be rotate 90 degrees. When combined with mirroring any 90 degree
-//|     rotation can be achieved.
+//|     If true, the TileGrid's axis will be swapped. When combined with mirroring, any 90 degree
+//|     rotation can be achieved along with the corresponding mirrored version.
 //|
 STATIC mp_obj_t displayio_tilegrid_obj_get_transpose_xy(mp_obj_t self_in) {
     displayio_tilegrid_t *self = native_tilegrid(self_in);
diff --git a/shared-module/displayio/Display.c b/shared-module/displayio/Display.c
index 4385e15f2..0ae88300a 100644
--- a/shared-module/displayio/Display.c
+++ b/shared-module/displayio/Display.c
@@ -354,4 +354,4 @@ bool displayio_display_fill_area(displayio_display_obj_t *self, displayio_area_t
 
 bool displayio_display_clip_area(displayio_display_obj_t *self, const displayio_area_t* area, displayio_area_t* clipped) {
     return displayio_area_compute_overlap(&self->area, area, clipped);
-}
\ No newline at end of file
+}
diff --git a/shared-module/displayio/Group.c b/shared-module/displayio/Group.c
index 76c29d644..15060e87b 100644
--- a/shared-module/displayio/Group.c
+++ b/shared-module/displayio/Group.c
@@ -40,7 +40,7 @@ uint32_t common_hal_displayio_group_get_scale(displayio_group_t* self) {
 
 bool displayio_group_get_previous_area(displayio_group_t *self, displayio_area_t* area) {
     bool first = true;
-    for (int32_t i = 0; i < self->size; i++) {
+    for (size_t i = 0; i < self->size; i++) {
         mp_obj_t layer = self->children[i].native;
         displayio_area_t layer_area;
         if (MP_OBJ_IS_TYPE(layer, &displayio_tilegrid_type)) {
@@ -74,7 +74,7 @@ static void _update_child_transforms(displayio_group_t* self) {
     if (!self->in_group) {
         return;
     }
-    for (int32_t i = 0; i < self->size; i++) {
+    for (size_t i = 0; i < self->size; i++) {
         mp_obj_t layer = self->children[i].native;
         if (MP_OBJ_IS_TYPE(layer, &displayio_tilegrid_type)) {
             displayio_tilegrid_update_transform(layer, &self->absolute_transform);
@@ -128,10 +128,10 @@ void common_hal_displayio_group_set_x(displayio_group_t* self, mp_int_t x) {
         return;
     }
     if (self->absolute_transform.transpose_xy) {
-        int8_t dy = self->absolute_transform.dy / self->scale;
+        int16_t dy = self->absolute_transform.dy / self->scale;
         self->absolute_transform.y += dy * (x - self->x);
     } else  {
-        int8_t dx = self->absolute_transform.dx / self->scale;
+        int16_t dx = self->absolute_transform.dx / self->scale;
         self->absolute_transform.x += dx * (x - self->x);
     }
 
diff --git a/shared-module/displayio/TileGrid.c b/shared-module/displayio/TileGrid.c
index 4420fc480..97b704c40 100644
--- a/shared-module/displayio/TileGrid.c
+++ b/shared-module/displayio/TileGrid.c
@@ -80,13 +80,15 @@ bool displayio_tilegrid_get_previous_area(displayio_tilegrid_t *self, displayio_
 }
 
 void _update_current_x(displayio_tilegrid_t *self) {
+    int16_t width;
+    if (self->transpose_xy) {
+        width = self->pixel_height;
+    } else {
+        width = self->pixel_width;
+    }
     if (self->absolute_transform->transpose_xy) {
         self->current_area.y1 = self->absolute_transform->y + self->absolute_transform->dy * self->x;
-        if (self->transpose_xy) {
-            self->current_area.y2 = self->absolute_transform->y + self->absolute_transform->dy * (self->x + self->pixel_height);
-        } else {
-            self->current_area.y2 = self->absolute_transform->y + self->absolute_transform->dy * (self->x + self->pixel_width);
-        }
+        self->current_area.y2 = self->absolute_transform->y + self->absolute_transform->dy * (self->x + width);
         if (self->current_area.y2 < self->current_area.y1) {
             int16_t temp = self->current_area.y2;
             self->current_area.y2 = self->current_area.y1;
@@ -94,11 +96,7 @@ void _update_current_x(displayio_tilegrid_t *self) {
         }
     } else {
         self->current_area.x1 = self->absolute_transform->x + self->absolute_transform->dx * self->x;
-        if (self->transpose_xy) {
-            self->current_area.x2 = self->absolute_transform->x + self->absolute_transform->dx * (self->x + self->pixel_height);
-        } else {
-            self->current_area.x2 = self->absolute_transform->x + self->absolute_transform->dx * (self->x + self->pixel_width);
-        }
+        self->current_area.x2 = self->absolute_transform->x + self->absolute_transform->dx * (self->x + width);
         if (self->current_area.x2 < self->current_area.x1) {
             int16_t temp = self->current_area.x2;
             self->current_area.x2 = self->current_area.x1;
@@ -108,13 +106,15 @@ void _update_current_x(displayio_tilegrid_t *self) {
 }
 
 void _update_current_y(displayio_tilegrid_t *self) {
+    int16_t height;
+    if (self->transpose_xy) {
+        height = self->pixel_width;
+    } else {
+        height = self->pixel_height;
+    }
     if (self->absolute_transform->transpose_xy) {
         self->current_area.x1 = self->absolute_transform->x + self->absolute_transform->dx * self->y;
-        if (self->transpose_xy) {
-            self->current_area.x2 = self->absolute_transform->x + self->absolute_transform->dx * (self->y + self->pixel_width);
-        } else {
-            self->current_area.x2 = self->absolute_transform->x + self->absolute_transform->dx * (self->y + self->pixel_height);
-        }
+        self->current_area.x2 = self->absolute_transform->x + self->absolute_transform->dx * (self->y + height);
         if (self->current_area.x2 < self->current_area.x1) {
             int16_t temp = self->current_area.x2;
             self->current_area.x2 = self->current_area.x1;
@@ -122,11 +122,7 @@ void _update_current_y(displayio_tilegrid_t *self) {
         }
     } else {
         self->current_area.y1 = self->absolute_transform->y + self->absolute_transform->dy * self->y;
-        if (self->transpose_xy) {
-            self->current_area.y2 = self->absolute_transform->y + self->absolute_transform->dy * (self->y + self->pixel_width);
-        } else {
-            self->current_area.y2 = self->absolute_transform->y + self->absolute_transform->dy * (self->y + self->pixel_height);
-        }
+        self->current_area.y2 = self->absolute_transform->y + self->absolute_transform->dy * (self->y + height);
         if (self->current_area.y2 < self->current_area.y1) {
             int16_t temp = self->current_area.y2;
             self->current_area.y2 = self->current_area.y1;
@@ -315,22 +311,12 @@ bool displayio_tilegrid_fill_area(displayio_tilegrid_t *self, const displayio_ar
     // How many pixels are outside of our area between us and the start of the row.
     uint16_t start = 0;
     if ((self->absolute_transform->dx < 0) != flip_x) {
-        // if (self->absolute_transform->transpose_xy) {
-        //     start += (area->y2 - area->y1 - 1) * y_stride;
-        //     y_stride *= -1;
-        // } else {
-            start += (area->x2 - area->x1 - 1) * x_stride;
-            x_stride *= -1;
-        //}
+        start += (area->x2 - area->x1 - 1) * x_stride;
+        x_stride *= -1;
     }
     if ((self->absolute_transform->dy < 0) != flip_y) {
-        // if (self->absolute_transform->transpose_xy) {
-        //     start += (area->x2 - area->x1 - 1) * x_stride;
-        //     x_stride *= -1;
-        // } else {
-            start += (area->y2 - area->y1 - 1) * y_stride;
-            y_stride *= -1;
-        //}
+        start += (area->y2 - area->y1 - 1) * y_stride;
+        y_stride *= -1;
     }
 
     // Track if this layer finishes filling in the given area. We can ignore any remaining