added Converter::convertColor with opacity parameter

Change-Id: I0f3759d8f75f2739b2815c37e8c81bc97e097ec8

sax/inc/sax/tools/converter.hxx

@@ -95,10 +95,15 @@ public:
     static void convertMeasurePx( ::rtl::OUStringBuffer& rBuffer,
                                   sal_Int32 nValue );
 
-    /** convert string to color */
+    /** convert string to rgb color */
     static bool convertColor( sal_Int32& rColor,
                               const ::rtl::OUString&rValue );
 
+    /** convert string to argb color */
+    static bool convertColor( sal_Int32& rColor,
+                              const ::rtl::OUString&rValue,
+                              const double alpha);
+
     /** convert color to string */
     static void convertColor( ::rtl::OUStringBuffer &rBuffer,
                               sal_Int32 nColor );

sax/source/tools/converter.cxx

@@ -478,7 +478,7 @@ int lcl_gethex( int nChar )
         return 0;
 }
 
-/** convert string to color */
+/** convert string to rgb color */
 bool Converter::convertColor( sal_Int32& rColor, const OUString& rValue )
 {
     if( rValue.getLength() != 7 || rValue[0] != '#' )
@@ -495,6 +495,26 @@ bool Converter::convertColor( sal_Int32& rColor, const OUString& rValue )
     return true;
 }
 
+/** convert string to rgba color */
+bool Converter::convertColor( sal_Int32& rColor, const OUString& rValue, const double alpha)
+{
+    if( rValue.getLength() != 7 || rValue[0] != '#' )
+        return false;
+
+    rColor = (int) (alpha * 255);
+    rColor <<= 8;
+
+    rColor |= lcl_gethex( rValue[1] ) * 16 + lcl_gethex( rValue[2] );
+    rColor <<= 8;
+
+    rColor |= ( lcl_gethex( rValue[3] ) * 16 + lcl_gethex( rValue[4] ) );
+    rColor <<= 8;
+
+    rColor |= ( lcl_gethex( rValue[5] ) * 16 + lcl_gethex( rValue[6] ) );
+
+    return true;
+}
+
 static sal_Char aHexTab[] = "0123456789abcdef";
 
 /** convert color to string */