initial commit, 4.5 stable

thirdparty/msdfgen/core/DistanceMapping.cpp

@@ -0,0 +1,27 @@
+
+#include "DistanceMapping.h"
+
+namespace msdfgen {
+
+DistanceMapping DistanceMapping::inverse(Range range) {
+    double rangeWidth = range.upper-range.lower;
+    return DistanceMapping(rangeWidth, range.lower/(rangeWidth ? rangeWidth : 1));
+}
+
+DistanceMapping::DistanceMapping() : scale(1), translate(0) { }
+
+DistanceMapping::DistanceMapping(Range range) : scale(1/(range.upper-range.lower)), translate(-range.lower) { }
+
+double DistanceMapping::operator()(double d) const {
+    return scale*(d+translate);
+}
+
+double DistanceMapping::operator()(Delta d) const {
+    return scale*d.value;
+}
+
+DistanceMapping DistanceMapping::inverse() const {
+    return DistanceMapping(1/scale, -scale*translate);
+}
+
+}