PDFBOX-5660: optimize, as suggested by Valery Bokov; closes #297

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1929407 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/pdmodel/graphics/color/PDIndexed.java

@@ -184,15 +184,14 @@ public BufferedImage toRGBImage(WritableRaster raster) throws IOException
         BufferedImage rgbImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
         WritableRaster rgbRaster = rgbImage.getRaster();
 
-        int[] src = new int[1];
+        int[] src = new int[width];
         for (int y = 0; y < height; y++)
         {
+            raster.getPixels(0, y, width, 1, src);
             for (int x = 0; x < width; x++)
             {
-                raster.getPixel(x, y, src);
-
                 // lookup
-                int index = Math.min(src[0], actualMaxIndex);
+                int index = Math.min(src[x], actualMaxIndex);
                 rgbRaster.setPixel(x, y, rgbColorTable[index]);
             }
         }