Add a half-decent custom crosshair

1 files changed, 36 insertions, 0 deletions

diff --git a/src/hexcolour.h b/src/hexcolour.h
new file mode 100644
index 0000000..def95f4
--- /dev/null
+++ b/src/hexcolour.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright © 2024 Michael Smith <mikesmiffy128@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "intdefs.h"
+
+/*
+ * Parses a user-provided RGB hex string, writing the RGBA bytes to out. May or
+ * may not modify the alpha byte; it is assumed to always be set to 255. That
+ * probably sounds dumb but makes sense for our specific use cases.
+ *
+ * Falls back on white if the input isn't valid. This also makes sense for our
+ * use cases.
+ */
+void hexcolour_rgb(uchar out[static 4], const char *s);
+
+/*
+ * Parses a user-provided RGBA hex string, writing the RGBA bytes to out.
+ * If both the alpha digits are missing, provides full opacity instead. If the
+ * value is malformed in some other way, falls back on solid white.
+ */
+void hexcolour_rgba(uchar out[static 4], const char *s);
+
+// vi: sw=4 ts=4 noet tw=80 cc=80