Add image/png; mode=16bit as a supported format

Author: rldhont

src/mapserver/qgshttprequesthandler.cpp

@@ -96,10 +96,11 @@ void QgsHttpRequestHandler::sendGetMapResponse( const QString& service, QImage*
   QgsDebugMsg( "Sending getmap response..." );
   if ( img )
   {
+    bool png16Bit = ( mFormatString.compare( "image/png; mode=16bit", Qt::CaseInsensitive ) == 0 );
     bool png8Bit = ( mFormatString.compare( "image/png; mode=8bit", Qt::CaseInsensitive ) == 0 );
     bool png1Bit = ( mFormatString.compare( "image/png; mode=1bit", Qt::CaseInsensitive ) == 0 );
     bool isBase64 = mFormatString.endsWith( ";base64", Qt::CaseInsensitive );
-    if ( mFormat != "PNG" && mFormat != "JPG" && !png8Bit && !png1Bit )
+    if ( mFormat != "PNG" && mFormat != "JPG" && !png16Bit && !png8Bit && !png1Bit )
     {
       QgsDebugMsg( "service exception - incorrect image format requested..." );
       sendServiceException( QgsMapServiceException( "InvalidFormat", "Output format '" + mFormatString + "' is not supported in the GetMap request" ) );
@@ -119,6 +120,11 @@ void QgsHttpRequestHandler::sendGetMapResponse( const QString& service, QImage*
                            Qt::ThresholdAlphaDither | Qt::NoOpaqueDetection );
       palettedImg.save( &buffer, "PNG", -1 );
     }
+    else if ( png16Bit )
+    {
+      QImage palettedImg = img->convertToFormat( QImage::Format_ARGB4444_Premultiplied );
+      palettedImg.save( &buffer, "PNG", -1 );
+    }
     else if ( png1Bit )
     {
       QImage palettedImg = img->convertToFormat( QImage::Format_Mono, Qt::MonoOnly | Qt::ThresholdDither |

src/mapserver/qgswmsserver.cpp

@@ -171,7 +171,7 @@ QDomDocument QgsWMSServer::getCapabilities( QString version, bool fullProjectInf
 
   //wms:GetMap
   elem = doc.createElement( "GetMap"/*wms:GetMap*/ );
-  appendFormats( doc, elem, QStringList() << "image/jpeg" << "image/png" << "image/png; mode=8bit" << "image/png; mode=1bit" );
+  appendFormats( doc, elem, QStringList() << "image/jpeg" << "image/png" << "image/png; mode=16bit" << "image/png; mode=8bit" << "image/png; mode=1bit" );
   elem.appendChild( dcpTypeElement.cloneNode().toElement() ); //this is the same as for 'GetCapabilities'
   requestElement.appendChild( elem );