r23444 by jghali - #16033: workaround round-trip error with QColor rgb <-> hsv conversions by using floating point versions of the functions

[scribus-commit]

Author: jghali
Date: Sat Jan 11 23:04:21 2020
New Revision: 23444

URL: http://scribus.net/websvn/listing.php?repname=Scribus&sc=1&rev=23444
Log:
#16033: workaround round-trip error with QColor rgb <-> hsv conversions by using floating point versions of the functions

Modified:
    branches/Version14x/Scribus/scribus/sccolorengine.cpp

Modified: branches/Version14x/Scribus/scribus/sccolorengine.cpp
URL: http://scribus.net/websvn/diff.php?repname=Scribus&rev=23444&path=/branches/Version14x/Scribus/scribus/sccolorengine.cpp
==============================================================================
--- branches/Version14x/Scribus/scribus/sccolorengine.cpp	(original)
+++ branches/Version14x/Scribus/scribus/sccolorengine.cpp	Sat Jan 11 23:04:21 2020
@@ -175,17 +175,17 @@
 	}
 	else
 	{
-		int h, s, v, snew, vnew;
+		qreal h, s, v, snew, vnew;
 		QColor tmpR(color.CR, color.MG, color.YB);
-		tmpR.getHsv(&h, &s, &v);
-		snew = qRound(s * level / 100.0);
-		vnew = 255 - qRound(((255 - v) * level / 100.0));
-		tmpR.setHsv(h, snew, vnew);
+		tmpR.getHsvF(&h, &s, &v);
+		snew = s * (level / 100.0);
+		vnew = 1.0 - (1.0 - v) * (level / 100.0);
+		tmpR.setHsvF(h, snew, vnew);
 		tmpR.getRgb(&rgb.r, &rgb.g, &rgb.b);
 		//We could also compute rgb shade using rgb directly
-		/*rgb.CR = 255 - ((255 - color.CR) * level / 100);
-		rgb.MG = 255 - ((255 - color.MG) * level / 100);
-		rgb.YB = 255 - ((255 - color.YB) * level / 100);*/
+		/*rgb.CR = 255 - ((255 - color.CR) * level / 100.0);
+		rgb.MG = 255 - ((255 - color.MG) * level / 100.0);
+		rgb.YB = 255 - ((255 - color.YB) * level / 100.0);*/
 	}
 }