1 files changed, 88 insertions, 0 deletions
diff --git a/fontconfig/src/fcweight.c b/fontconfig/src/fcweight.c
new file mode 100644
index 000000000..87bbe67ab
--- /dev/null
+++ b/fontconfig/src/fcweight.c
@@ -0,0 +1,88 @@
+/*
+ * fontconfig/src/fcweight.c
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the author(s) not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission.  The authors make no
+ * representations about the suitability of this software for any purpose.  It
+ * is provided "as is" without express or implied warranty.
+ *
+ * THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, 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 "fcint.h"
+
+static const struct {
+  int ot;
+  int fc;
+} map[] = {
+    {   0, FC_WEIGHT_THIN },
+    { 100, FC_WEIGHT_THIN },
+    { 200, FC_WEIGHT_EXTRALIGHT },
+    { 350, FC_WEIGHT_DEMILIGHT },
+    { 300, FC_WEIGHT_LIGHT },
+    { 380, FC_WEIGHT_BOOK },
+    { 400, FC_WEIGHT_REGULAR },
+    { 500, FC_WEIGHT_MEDIUM },
+    { 600, FC_WEIGHT_DEMIBOLD },
+    { 700, FC_WEIGHT_BOLD },
+    { 800, FC_WEIGHT_EXTRABOLD },
+    { 900, FC_WEIGHT_BLACK },
+    {1000, FC_WEIGHT_EXTRABLACK },
+};
+
+static int lerp(int x, int x1, int x2, int y1, int y2)
+{
+  int dx = x2 - x1;
+  int dy = y2 - y1;
+  assert (dx > 0 && dy > 0 && x1 <= x && x <= x2);
+  return y1 + (dy*(x-x1) + dx/2) / dx;
+}
+
+FcPublic int
+FcWeightFromOpenType (int ot_weight)
+{
+	int i;
+	if (ot_weight <= 0 || ot_weight > 1000)
+	    return -1;
+
+	for (i = 1; ot_weight > map[i].ot; i++)
+	  ;
+
+	if (ot_weight == map[i].ot)
+	  return map[i].fc;
+
+	/* Interpolate between two items. */
+	return lerp (ot_weight, map[i-1].ot, map[i].ot, map[i-1].fc, map[i].fc);
+}
+
+FcPublic int
+FcWeightToOpenType (int fc_weight)
+{
+	int i;
+	if (fc_weight < 0 || fc_weight > FC_WEIGHT_EXTRABLACK)
+	    return -1;
+
+	for (i = 1; fc_weight > map[i].fc; i++)
+	  ;
+
+	if (fc_weight == map[i].fc)
+	  return map[i].ot;
+
+	/* Interpolate between two items. */
+	return lerp (fc_weight, map[i-1].fc, map[i].fc, map[i-1].ot, map[i].ot);
+}
+
+#define __fcweight__
+#include "fcaliastail.h"
+#undef __fcweight__