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diff --git a/libdimension/dimension/canvas.h b/libdimension/dimension/canvas.h
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+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of Dimension.                                       *
+ *                                                                       *
+ * Dimension is free software; you can redistribute it and/or modify it  *
+ * under the terms of the GNU Lesser General Public License as published *
+ * by the Free Software Foundation; either version 3 of the License, or  *
+ * (at your option) any later version.                                   *
+ *                                                                       *
+ * Dimension is distributed in the hope that it will be useful, but      *
+ * WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/*
+ * A canvas which is rendered to.
+ */
+
+#ifndef DIMENSION_CANVAS_H
+#define DIMENSION_CANVAS_H
+
+/* 48-bit sRGB color for pixels. */
+typedef struct {
+  uint16_t r, g, b;
+  uint16_t a, t;
+} dmnsn_pixel;
+
+dmnsn_pixel dmnsn_pixel_from_color(dmnsn_color color);
+dmnsn_color dmnsn_color_from_pixel(dmnsn_pixel pixel);
+
+typedef struct {
+  unsigned int x, y;
+
+  /*
+   * Stored in first-quadrant representation (origin is bottom-left).  The pixel
+   * at (a,b) is accessible as pixels[b*x + a].
+   */
+  dmnsn_pixel *pixels;
+} dmnsn_canvas;
+
+dmnsn_canvas *dmnsn_new_canvas(unsigned int x, unsigned int y);
+void dmnsn_delete_canvas(dmnsn_canvas *canvas);
+
+#endif /* DIMENSION_CANVAS_H */