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diff --git a/circuitpython/shared-module/displayio/area.h b/circuitpython/shared-module/displayio/area.h
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+++ b/circuitpython/shared-module/displayio/area.h
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+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_SHARED_MODULE_DISPLAYIO_AREA_H
+#define MICROPY_INCLUDED_SHARED_MODULE_DISPLAYIO_AREA_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+// Implementations are in area.c
+typedef struct _displayio_area_t displayio_area_t;
+
+struct _displayio_area_t {
+    int16_t x1;
+    int16_t y1;
+    int16_t x2; // Second point is exclusive.
+    int16_t y2;
+    const displayio_area_t *next; // Next area in the linked list.
+};
+
+typedef struct {
+    uint16_t x;
+    uint16_t y;
+    int8_t dx;
+    int8_t dy;
+    uint8_t scale;
+    uint16_t width;
+    uint16_t height;
+    bool mirror_x;
+    bool mirror_y;
+    bool transpose_xy;
+} displayio_buffer_transform_t;
+
+extern displayio_buffer_transform_t null_transform;
+
+bool displayio_area_empty(const displayio_area_t *a);
+void displayio_area_copy_coords(const displayio_area_t *src, displayio_area_t *dest);
+void displayio_area_canon(displayio_area_t *a);
+void displayio_area_union(const displayio_area_t *a,
+    const displayio_area_t *b,
+    displayio_area_t *u);
+void displayio_area_copy(const displayio_area_t *src, displayio_area_t *dst);
+void displayio_area_scale(displayio_area_t *area, uint16_t scale);
+void displayio_area_shift(displayio_area_t *area, int16_t dx, int16_t dy);
+bool displayio_area_compute_overlap(const displayio_area_t *a,
+    const displayio_area_t *b,
+    displayio_area_t *overlap);
+uint16_t displayio_area_width(const displayio_area_t *area);
+uint16_t displayio_area_height(const displayio_area_t *area);
+uint32_t displayio_area_size(const displayio_area_t *area);
+bool displayio_area_equal(const displayio_area_t *a, const displayio_area_t *b);
+void displayio_area_transform_within(bool mirror_x, bool mirror_y, bool transpose_xy,
+    const displayio_area_t *original,
+    const displayio_area_t *whole,
+    displayio_area_t *transformed);
+
+#endif // MICROPY_INCLUDED_SHARED_MODULE_DISPLAYIO_AREA_H