Fix bug #50299 with patch from Andrei - Fix XSSFColor fetching of white and black background themes

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1072053 13f79535-47bb-0310-9956-ffa450edef68

src/documentation/content/xdocs/status.xml

@@ -34,6 +34,7 @@
 
     <changes>
         <release version="3.8-beta1" date="2010-??-??">
+           <action dev="poi-developers" type="fix">50299 - Fix XSSFColor fetching of white and black background themes</action>
            <action dev="poi-developers" type="fix">50795 - Avoid NPE from xmlbeans when moving XSSF Comments from one cell to another</action>
            <action dev="poi-developers" type="fix">46664 - When creating HSSF Print Areas, ensure the named range is reference based not value based</action>
            <action dev="poi-developers" type="fix">50756 - When formatting numbers based on their Cell Style, treat GENERAL the same as the more typical General</action>

src/ooxml/java/org/apache/poi/xssf/model/ThemesTable.java

@@ -51,7 +51,17 @@ public class ThemesTable extends POIXMLDocumentPart {
             if (obj instanceof org.openxmlformats.schemas.drawingml.x2006.main.CTColor) {
                 if (cnt == idx) {
                     ctColor = (org.openxmlformats.schemas.drawingml.x2006.main.CTColor) obj;
-                    return new XSSFColor(ctColor.getSrgbClr().getVal());
+                    
+                    byte[] rgb = null;
+                    if (ctColor.getSrgbClr() != null) {
+                       // Colour is a regular one 
+                       rgb = ctColor.getSrgbClr().getVal();
+                    } else if (ctColor.getSysClr() != null) {
+                       // Colour is a tint of white or black
+                       rgb = ctColor.getSysClr().getLastClr();
+                    }
+
+                    return new XSSFColor(rgb);
                 }
                 cnt++;
             }

src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFBugs.java

@@ -673,6 +673,37 @@ public final class TestXSSFBugs extends BaseTestBugzillaIssues {
        assertEquals(exp, comment.getString().getString());
     }
     
+    /**
+     * When the cell background colour is set with one of the first
+     *  two columns of the theme colour palette, the colours are 
+     *  shades of white or black.
+     * For those cases, ensure we don't break on reading the colour
+     */
+    public void test50299() throws Exception {
+       Workbook wb = XSSFTestDataSamples.openSampleWorkbook("50299.xlsx");
+       
+       // Check all the colours
+       for(int sn=0; sn<wb.getNumberOfSheets(); sn++) {
+          Sheet s = wb.getSheetAt(sn);
+          for(Row r : s) {
+             for(Cell c : r) {
+                CellStyle cs = c.getCellStyle();
+                if(cs != null) {
+                   cs.getFillForegroundColor();
+                }
+             }
+          }
+       }
+       
+       // Check one bit in detail
+       // TODO Is this correct, shouldn't one be white and one black?
+       Sheet s = wb.getSheetAt(0);
+       assertEquals(0,  s.getRow(0).getCell(8).getCellStyle().getFillForegroundColor());
+       assertEquals(64, s.getRow(0).getCell(8).getCellStyle().getFillBackgroundColor());
+       assertEquals(0,  s.getRow(1).getCell(8).getCellStyle().getFillForegroundColor());
+       assertEquals(64, s.getRow(1).getCell(8).getCellStyle().getFillBackgroundColor());
+    }
+    
     /**
      * Fonts where their colours come from the theme rather
      *  then being set explicitly still should allow the