Dave Smith created PDFBOX-1445:
----------------------------------
Summary: /ImageMask true does not work. Patch included.
Key: PDFBOX-1445
URL: https://issues.apache.org/jira/browse/PDFBOX-1445
Project: PDFBox
Issue Type: Bug
Reporter: Dave Smith
I have the following pdf...
10 0 obj
<<
/Type /Page
/MediaBox [ 0 0 612.0 792.0 ]
/Parent 3 0 R
/Resources << /XObject << /Obj4 4 0 R /Obj5 5 0 R /Obj6 6 0 R /Obj7 7 0 R >>
/ProcSet [ /PDF /Text /ImageB /ImageC /ImageI ] >>
/Contents [ 8 0 R 9 0 R ]
>>
endobj
Which then draws 4 images. The first one is a "base" and then rest are image
masks
9 0 obj
<< /Filter /FlateDecode /Length 121 >>
stream
q
612.00 0 0 792.00 0.00 0.00 cm
/Obj4 Do
Q
q
0.129 g
524.16 0 0 556.80 48.00 127.68 cm
/Obj5 Do
Q
q
0.302 g
220.80 0 0 398.40 48.00 286.08 cm
/Obj6 Do
Q
q
0.204 g
524.16 0 0 469.44 48.00 185.28 cm
/Obj7 Do
Q
endstream
endobj
4 0 obj
<< /Type /XObject /Subtype /Image /Width 1275 /Height 1650 /BitsPerComponent 8
/ColorSpace /DeviceGray /Filter [ /FlateDecode /DCTDecode ] /Length 50485 >>
stream
endstream
endobj
5 0 obj
<< /Type /XObject /Subtype /Image /Width 2184 /Height 2320 /BitsPerComponent 1
/ImageMask true /Filter /CCITTFaxDecode /DecodeParms << /K -1 /Columns 2184 >>
/Length 15580 >>
stream
etc ...
The current code simply treats the imagemask as an image. Since this is just a
1 bit image it has no Alpha channel it overwrites the existing image and we
simply get the last image drawn.
In
org.apache.pdfbox.util.operator.pagedrawer.Invoke.java
method
public void process(PDFOperator operator, List<COSBase> arguments) throws
IOException
after
if (awtImage == null)
{
LOG.warn("getRGBImage returned NULL");
return;//TODO PKOCH
}
If you add the following code it fixes the problem. I can not provide the
sample doc due to privacy reasons.
/**
* Spec 8.9.6.2
* If ImageMask is true then the image is one bit. Black means
draw the current colour and white means use the colour on the current image (ie
Mask).
* Convert the map to an image with an Alpha channel so we can
lay it on top
*/
if(image.getImageMask())
{
Color currentColour =
drawer.getGraphicsState().getStrokingColor().getJavaColor();
final int onColour = 0xff000000 |
currentColour.getRGB();
BufferedImage bia = new
BufferedImage(awtImage.getWidth(),awtImage.getHeight(),BufferedImage.TYPE_INT_ARGB);
for(int y=0;y<awtImage.getHeight();y++)
{
for(int x=0;x<awtImage.getWidth();x++)
{
bia.setRGB(x, y, (awtImage.getRGB(x, y)
& 0x00ffffff) == 0xffffff ? 0x00ffffff : onColour);
}
}
awtImage = bia;
}
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