Save raster symbology with full precision (fix #14950)

(cherry-picked from a6cb81b)

Author: nyalldawson

src/core/raster/qgscontrastenhancement.cpp

@@ -25,6 +25,7 @@ class originally created circa 2004 by T.Sutton, Gary E.Sherman, Steve Halasz
 #include "qgslinearminmaxenhancement.h"
 #include "qgslinearminmaxenhancementwithclip.h"
 #include "qgscliptominmaxenhancement.h"
+#include "qgsrasterblock.h"
 #include <QDomDocument>
 #include <QDomElement>
 
@@ -361,13 +362,13 @@ void QgsContrastEnhancement::writeXML( QDomDocument& doc, QDomElement& parentEle
 {
   //minimum value
   QDomElement minElem = doc.createElement( "minValue" );
-  QDomText minText = doc.createTextNode( QString::number( mMinimumValue ) );
+  QDomText minText = doc.createTextNode( QgsRasterBlock::printValue( mMinimumValue ) );
   minElem.appendChild( minText );
   parentElem.appendChild( minElem );
 
   //maximum value
   QDomElement maxElem = doc.createElement( "maxValue" );
-  QDomText maxText = doc.createTextNode( QString::number( mMaximumValue ) );
+  QDomText maxText = doc.createTextNode( QgsRasterBlock::printValue( mMaximumValue ) );
   maxElem.appendChild( maxText );
   parentElem.appendChild( maxElem );
 

src/core/raster/qgsrasterlayer.cpp

@@ -1528,8 +1528,8 @@ bool QgsRasterLayer::writeXml( QDomNode & layer_node,
     {
       QDomElement noDataRange =  document.createElement( "noDataRange" );
 
-      noDataRange.setAttribute( "min", range.min() );
-      noDataRange.setAttribute( "max", range.max() );
+      noDataRange.setAttribute( "min", QgsRasterBlock::printValue( range.min() ) );
+      noDataRange.setAttribute( "max", QgsRasterBlock::printValue( range.max() ) );
       noDataRangeList.appendChild( noDataRange );
     }
 

src/core/raster/qgsrastershader.cpp

@@ -19,6 +19,7 @@ email                : ersts@amnh.org
 #include "qgslogger.h"
 #include "qgscolorrampshader.h"
 #include "qgsrastershader.h"
+#include "qgsrasterblock.h"
 #include <QDomDocument>
 #include <QDomElement>
 
@@ -151,7 +152,7 @@ void QgsRasterShader::writeXML( QDomDocument& doc, QDomElement& parent ) const
     {
       QDomElement itemElem = doc.createElement( "item" );
       itemElem.setAttribute( "label", itemIt->label );
-      itemElem.setAttribute( "value", QString::number( itemIt->value ) );
+      itemElem.setAttribute( "value", QgsRasterBlock::printValue( itemIt->value ) );
       itemElem.setAttribute( "color", itemIt->color.name() );
       itemElem.setAttribute( "alpha", itemIt->color.alpha() );
       colorRampShaderElem.appendChild( itemElem );

src/core/raster/qgssinglebandpseudocolorrenderer.cpp

@@ -224,8 +224,8 @@ void QgsSingleBandPseudoColorRenderer::writeXML( QDomDocument& doc, QDomElement&
   {
     mShader->writeXML( doc, rasterRendererElem ); //todo: include color ramp items directly in this renderer
   }
-  rasterRendererElem.setAttribute( "classificationMin", QString::number( mClassificationMin ) );
-  rasterRendererElem.setAttribute( "classificationMax", QString::number( mClassificationMax ) );
+  rasterRendererElem.setAttribute( "classificationMin", QgsRasterBlock::printValue( mClassificationMin ) );
+  rasterRendererElem.setAttribute( "classificationMax", QgsRasterBlock::printValue( mClassificationMax ) );
   rasterRendererElem.setAttribute( "classificationMinMaxOrigin", QgsRasterRenderer::minMaxOriginName( mClassificationMinMaxOrigin ) );
 
   parentElem.appendChild( rasterRendererElem );