add some helper functions

src/ofxMsdfgen.cpp

@@ -0,0 +1,31 @@
+#include "ofxMsdfgen.h"
+#include "ofPixels.h"
+
+void ofxMsdfgen::toOfImage(const msdfgen::Bitmap <float, 3> bitmap,
+                           ofFloatImage & image){
+    image.allocate(bitmap.width(), bitmap.height(), OF_IMAGE_COLOR);
+    memcpy(image.getPixels().getData(), bitmap.getPixels(), bitmap.width() * bitmap.height() * 3 * sizeof(float));
+    image.update(); // float is slow here
+}
+
+void ofxMsdfgen::toOfImage(const msdfgen::Bitmap <float, 3> bitmap,
+                           ofImage & image){
+    image.allocate(bitmap.width(), bitmap.height(), OF_IMAGE_COLOR);
+    ofPixels & pixels = image.getPixels();
+    int w = bitmap.width();
+    int h = bitmap.height();
+    for(int y = 0; y < h; y++){
+        for(int x = 0; x < w; x++){
+            const float * rgb = bitmap(x, y);
+            int index = 3 * (x + y * w);
+            pixels.getData()[index] = (unsigned char)std::clamp(rgb[0] * 256.0,
+                                                                0.0, 255.0);
+            pixels.getData()[index + 1] = (unsigned char)std::clamp(rgb[1] * 256.0,
+                                                                    0.0, 255.0);
+            pixels.getData()[index + 2] = (unsigned char)std::clamp(rgb[2] * 256.0,
+                                                                    0.0, 255.0);
+        }
+    }
+
+    image.update();
+}

src/ofxMsdfgen.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#include "ofMain.h"
+#include <msdf-atlas-gen/msdf-atlas-gen.h>
+
+namespace ofxMsdfgen {
+void toOfImage(const msdfgen::Bitmap <float, 3> bitmap,
+               ofFloatImage & image);
+void toOfImage(const msdfgen::Bitmap <float, 3> bitmap,
+               ofImage & image);
+}