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diff --git a/src/libwebp.vapi b/src/libwebp.vapi
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+/*
+ * Copyright (C) 2017 Stéphane Fillion
+ * Authors: Stéphane Fillion <stphanef3724@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version. See http://www.gnu.org/copyleft/gpl.html the full text of the
+ * license.
+ */
+
+namespace WebP
+{
+    // Returns the size of the compressed data (pointed to by *output), or 0 if
+    // an error occurred. The compressed data must be released by the caller
+    // using the call 'free(*output)'.
+    // These functions compress using the lossy format, and the quality_factor
+    // can go from 0 (smaller output, lower quality) to 100 (best quality,
+    // larger output).
+    [CCode (cheader_filename = "webp/encode.h", cname = "WebPEncodeRGB")]
+    private size_t _encode_rgb ([CCode (array_length = false)] uint8[] rgb,
+                                int width,
+                                int height,
+                                int stride,
+                                float quality_factor,
+                                [CCode (array_length = false)] out uint8[] output);
+    [CCode (cname = "vala_encode_rgb")]
+    public uint8[] encode_rgb (uint8[] rgb, int width, int height, int stride, float quality_factor)
+    {
+        uint8[] output;
+        size_t length;
+        length = _encode_rgb (rgb, width, height, stride, quality_factor, out output);
+        output.length = (int) length;
+        return output;
+    }
+
+    // These functions are the equivalent of the above, but compressing in a
+    // lossless manner. Files are usually larger than lossy format, but will
+    // not suffer any compression loss.
+    [CCode (cheader_filename = "webp/encode.h", cname = "WebPEncodeLosslessRGB")]
+    private size_t _encode_lossless_rgb ([CCode (array_length = false)] uint8[] rgb,
+                                         int width,
+                                         int height,
+                                         int stride,
+                                         [CCode (array_length = false)] out uint8[] output);
+    [CCode (cname = "vala_encode_lossless_rgb")]
+    public uint8[] encode_lossless_rgb (uint8[] rgb, int width, int height, int stride)
+    {
+        uint8[] output;
+        size_t length;
+        length = _encode_lossless_rgb (rgb, width, height, stride, out output);
+        output.length = (int) length;
+        return output;
+    }
+}