Copying float branch into default (apart from metadata tunneling, which oduis needs to re-enable n line 278 of simpleprocess.cc). I copied rtengine into default and patched things up, so this branch should have the rtgui of default and the rtengine of float.

rtengine/labimage.cc

@@ -0,0 +1,45 @@
+#include <labimage.h>
+namespace rtengine {
+
+LabImage::LabImage (int w, int h) : fromImage(false), W(w), H(h) {
+
+    L = new float*[H];
+    a = new float*[H];
+    b = new float*[H];
+
+    data = new float [W*H*3];
+    float * index = data;
+    for (int i=0; i<H; i++)
+        L[i] = index + i*W;
+    index+=W*H;
+    for (int i=0; i<H; i++)
+        a[i] = index + i*W;
+    index+=W*H;
+
+    for (int i=0; i<H; i++)
+        b[i] = index + i*W;
+}
+
+LabImage::LabImage (Image16* im) {
+
+    W = im->width;
+    H = im->height;
+	for (int i=0; i<H; i++) 
+		for (int j=0; j<W; j++) {
+			L[i][j] = im->r[i][j];
+			a[i][j] = im->g[i][j];
+			b[i][j] = im->b[i][j];
+		}
+    fromImage = true;
+}
+
+LabImage::~LabImage () {
+
+    if (!fromImage) {
+        delete [] L;
+        delete [] a;
+        delete [] b;
+        delete [] data;
+    }
+}
+}