1 files changed, 37 insertions, 0 deletions
diff --git a/xmpp-vala/src/module/xep/0392_consistent_color/consistent_color.vala b/xmpp-vala/src/module/xep/0392_consistent_color/consistent_color.vala
new file mode 100644
index 00000000..9ab7e4bb
--- /dev/null
+++ b/xmpp-vala/src/module/xep/0392_consistent_color/consistent_color.vala
@@ -0,0 +1,37 @@
+namespace Xmpp.Xep.ConsistentColor {
+private const double KR = 0.299;
+private const double KG = 0.587;
+private const double KB = 0.114;
+private const double Y = 0.732;
+
+public float string_to_angle(string s) {
+    Checksum checksum = new Checksum(ChecksumType.SHA1);
+    checksum.update(s.data, -1);
+    size_t len = 20;
+    uint8[] digest = new uint8[len];
+    checksum.get_digest(digest, ref len);
+    uint16 output = ((uint16)(*(uint16*)digest)).to_little_endian();
+    return (((float) output) / 65536.0f) * 360.0f;
+}
+
+private uint8[] rgbd_to_rgb(double[] rgbd) {
+    return {(uint8)(rgbd[0] * 255.0), (uint8)(rgbd[1] * 255.0), (uint8)(rgbd[2] * 255.0)};
+}
+
+private float[] rgbd_to_rgbf(double[] rgbd) {
+    return {(float)rgbd[0], (float)rgbd[1], (float)rgbd[2]};
+}
+
+private double[] angle_to_rgbd(double angle) {
+    return Hsluv.hsluv_to_rgb(new double[] {angle, 100, 50});
+}
+
+public float[] string_to_rgbf(string s) {
+    return rgbd_to_rgbf(angle_to_rgbd(string_to_angle(s)));
+}
+
+public uint8[] string_to_rgb(string s) {
+    return rgbd_to_rgb(angle_to_rgbd(string_to_angle(s)));
+}
+
+}