1 files changed, 75 insertions, 0 deletions
diff --git a/libdimension/dimension/canvas/png.h b/libdimension/dimension/canvas/png.h
new file mode 100644
index 0000000..57a68c2
--- /dev/null
+++ b/libdimension/dimension/canvas/png.h
@@ -0,0 +1,75 @@
+/*************************************************************************
+ * Copyright (C) 2009-2014 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
+ * PNG import/export of canvases.
+ */
+
+#ifndef DMNSN_CANVAS_H
+#error "Please include <dimension/canvas.h> instead of this header directly."
+#endif
+
+#include <stdio.h>
+
+/**
+ * Optimize a canvas for PNG exporting
+ * @param[in] pool  The memory pool to allocate from.
+ * @param[in,out] canvas  The canvas to optimize.
+ * @return Whether the canvas was successfully optimized.
+ */
+int dmnsn_png_optimize_canvas(dmnsn_pool *pool, dmnsn_canvas *canvas);
+
+/**
+ * Write a canvas to a file in PNG format.
+ * @param[in] canvas  The canvas to write.
+ * @param[in,out] file  The file to write to.
+ * @return 0 on success, non-zero on failure.
+ */
+int dmnsn_png_write_canvas(const dmnsn_canvas *canvas, FILE *file);
+
+/**
+ * Write a canvas to a PNG file in the background.
+ * @param[in] canvas  The canvas to write.
+ * @param[in,out] file  The file to write to.
+ * @return A \ref dmnsn_future object, or NULL on failure.
+ */
+dmnsn_future *dmnsn_png_write_canvas_async(const dmnsn_canvas *canvas,
+                                           FILE *file);
+
+/**
+ * Read a canvas from a PNG file.
+ * @param[in] pool  The memory pool to allocate from.
+ * @param[in,out] file  The PNG file to read.
+ * @return The new canvas, or NULL on failure.
+ */
+dmnsn_canvas *dmnsn_png_read_canvas(dmnsn_pool *pool, FILE *file);
+
+/**
+ * Read a canvas from a PNG file in the background.
+ * @param[out] canvas  The address of a non-allocated canvas object.  The canvas
+ *                     object will be allocated and filled with the contents of
+ *                     \p file.  Do not read from this object until the
+ *                     background task has finished.
+ * @param[in] pool  The memory pool to allocate from.
+ * @param[in,out] file  The PNG file to read.
+ * @return A \ref dmnsn_future object, or NULL on failure.
+ */
+dmnsn_future *dmnsn_png_read_canvas_async(dmnsn_canvas **canvas, dmnsn_pool *pool, FILE *file);