1 files changed, 57 insertions, 0 deletions
diff --git a/libdimension/model/pigments/canvas_pigment.c b/libdimension/model/pigments/canvas_pigment.c
new file mode 100644
index 0000000..bb83b0a
--- /dev/null
+++ b/libdimension/model/pigments/canvas_pigment.c
@@ -0,0 +1,57 @@
+/*************************************************************************
+ * Copyright (C) 2010-2014 Tavian Barnes <tavianator@tavianator.com>     *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library 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.                       *
+ *                                                                       *
+ * The Dimension Library 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/>.                                       *
+ *************************************************************************/
+
+/**
+ * @file
+ * Image maps.
+ */
+
+#include "dimension/model.h"
+
+/// Canvas pigment type.
+typedef struct dmnsn_canvas_pigment {
+  dmnsn_pigment pigment;
+  dmnsn_canvas *canvas;
+} dmnsn_canvas_pigment;
+
+/// Canvas pigment color callback.
+static dmnsn_tcolor
+dmnsn_canvas_pigment_fn(const dmnsn_pigment *pigment, dmnsn_vector v)
+{
+  const dmnsn_canvas_pigment *canvas_pigment = (const dmnsn_canvas_pigment *)pigment;
+  dmnsn_canvas *canvas = canvas_pigment->canvas;
+
+  size_t x = llround((fmod(v.x, 1.0) + 1.0)*(canvas->width  - 1));
+  size_t y = llround((fmod(v.y, 1.0) + 1.0)*(canvas->height - 1));
+  return dmnsn_canvas_get_pixel(canvas, x%canvas->width, y%canvas->height);
+}
+
+// Create a canvas color
+dmnsn_pigment *
+dmnsn_new_canvas_pigment(dmnsn_pool *pool, dmnsn_canvas *canvas)
+{
+  dmnsn_canvas_pigment *canvas_pigment = DMNSN_PALLOC(pool, dmnsn_canvas_pigment);
+  canvas_pigment->canvas = canvas;
+
+  dmnsn_pigment *pigment = &canvas_pigment->pigment;
+  dmnsn_init_pigment(pigment);
+  pigment->pigment_fn = dmnsn_canvas_pigment_fn;
+  return pigment;
+}