svn commit: r1768754 - /pdfbox/trunk/tools/src/main/java/org/apache/pdfbox/tools/ExtractImages.java

[ti...@apache.org]

Author: tilman
Date: Tue Nov  8 17:59:48 2016
New Revision: 1768754

URL: http://svn.apache.org/viewvc?rev=1768754&view=rev
Log:
PDFBOX-3559: don't use fast path for jpeg if there is a mask; improve javadoc

Modified:
    pdfbox/trunk/tools/src/main/java/org/apache/pdfbox/tools/ExtractImages.java

Modified: pdfbox/trunk/tools/src/main/java/org/apache/pdfbox/tools/ExtractImages.java
URL: http://svn.apache.org/viewvc/pdfbox/trunk/tools/src/main/java/org/apache/pdfbox/tools/ExtractImages.java?rev=1768754&r1=1768753&r2=1768754&view=diff
==============================================================================
--- pdfbox/trunk/tools/src/main/java/org/apache/pdfbox/tools/ExtractImages.java (original)
+++ pdfbox/trunk/tools/src/main/java/org/apache/pdfbox/tools/ExtractImages.java Tue Nov  8 17:59:48 2016
@@ -292,11 +292,23 @@ public final class ExtractImages
         }
     }
 
+    private boolean hasMasks(PDImage pdImage) throws IOException
+    {
+        if (pdImage instanceof PDImageXObject)
+        {
+            PDImageXObject ximg = (PDImageXObject) pdImage;
+            return ximg.getMask() != null || ximg.getSoftMask() != null;
+        }
+        return false;
+    }
+
     /**
-     * Writes the image to a file with the filename + an appropriate suffix, like "Image.jpg".
-     * The suffix is automatically set by the
-     * @param filename the filename
-     * @throws IOException When somethings wrong with the corresponding file.
+     * Writes the image to a file with the filename prefix + an appropriate suffix, like "Image.jpg".
+     * The suffix is automatically set depending on the image compression in the PDF.
+     * @param pdImage the image.
+     * @param prefix the filename prefix.
+     * @param directJPEG if true, force saving JPEG streams as they are in the PDF file. 
+     * @throws IOException When something is wrong with the corresponding file.
      */
     private void write2file(PDImage pdImage, String filename, boolean directJPEG) throws IOException
     {
@@ -316,10 +328,12 @@ public final class ExtractImages
                 if ("jpg".equals(suffix))
                 {
                     String colorSpaceName = pdImage.getColorSpace().getName();
-                    if (directJPEG || PDDeviceGray.INSTANCE.getName().equals(colorSpaceName) ||
-                                      PDDeviceRGB.INSTANCE.getName().equals(colorSpaceName))
+                    if (directJPEG || 
+                            !hasMasks(pdImage) && 
+                                     (PDDeviceGray.INSTANCE.getName().equals(colorSpaceName) ||
+                                      PDDeviceRGB.INSTANCE.getName().equals(colorSpaceName)))
                     {
-                        // RGB or Gray colorspace: get and write the unmodifiedJPEG stream
+                        // RGB or Gray colorspace: get and write the unmodified JPEG stream
                         InputStream data = pdImage.createInputStream(JPEG);
                         IOUtils.copy(data, out);
                         IOUtils.closeQuietly(data);