Problem converting pdf page w/ fully embedded TTF font, Identity-H (CID)

[Armando Singer <ar...@gmail.com>]

I'm running into an issue when trying to convert a pdf page to an image. Conditions:

- Pdf file with TrueType font fully embedded
- Encoding: Identity-H (CID)

Although the FontFile2 stream is present, I get (I added extra info logging):

Jun 1, 2010 12:44:38 PM org.apache.pdfbox.pdmodel.font.PDFontFactory createFont
INFO: subType: COSName{Type0}
Jun 1, 2010 12:44:38 PM org.apache.pdfbox.pdmodel.font.PDFontFactory createFont
INFO: subType: COSName{CIDFontType2}
Jun 1, 2010 12:44:39 PM org.apache.pdfbox.pdmodel.font.PDType1Font getawtFont
INFO: Can't find the specified basefont DroidSansFallback
java.lang.Throwable
	at org.apache.pdfbox.pdmodel.font.PDType1Font.getawtFont(PDType1Font.java:234)
	at org.apache.pdfbox.pdmodel.font.PDSimpleFont.drawString(PDSimpleFont.java:97)
	at org.apache.pdfbox.pdmodel.font.PDType0Font.drawString(PDType0Font.java:68)
	at org.apache.pdfbox.pdfviewer.PageDrawer.processTextPosition(PageDrawer.java:190)
	at org.apache.pdfbox.util.PDFStreamEngine.processEncodedText(PDFStreamEngine.java:498)
	at org.apache.pdfbox.util.operator.ShowText.process(ShowText.java:45)
	at org.apache.pdfbox.util.PDFStreamEngine.processOperator(PDFStreamEngine.java:556)
	at org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:250)
	at org.apache.pdfbox.util.PDFStreamEngine.processStream(PDFStreamEngine.java:208)
	at org.apache.pdfbox.pdfviewer.PageDrawer.drawPage(PageDrawer.java:111)
	at org.apache.pdfbox.pdmodel.PDPage.convertToImage(PDPage.java:718)
	at org.apache.pdfbox.util.PDFImageWriter.writeImage(PDFImageWriter.java:137)
	at org.apache.pdfbox.PDFToImage.main(PDFToImage.java:204)
INFO: Using font ArialMT instead

test with:

java -jar pdfbox-app-1.2.0-SNAPSHOT.jar PDFToImage -imageType png -startPage 1 -endPage 1 -color rgba -resolution 108 hello-DroidSans-Identity-H.pdf

Attached is a sample pdf with one of the droid fonts fully embedded in the above manner (free, Apache 2 license):

http://android.git.kernel.org/?p=platform/frameworks/base.git;a=tree;f=data/fonts;hb=HEAD

I'm wondering if this is a known issue, and if would would be appropriate to follow the chain to the TrueType font file stream to load the AWT font. Currently PDType0 font extends PDType1 font. Perhaps we can special case for Identity CID fonts? Does that seem like a good idea?

(I was able to hack fix by changing PDType0 to extends PDTrueTypeFont, but that seems like a terrible hack).

Below are the relevant parts of the pdf that cause the getawtFont issue:

1 0 obj
<</DescendantFonts[7 0 R]
/BaseFont/DroidSans/Type/Font/Encoding/Identity-H/Subtype/Type0/ToUnicode 8 0 R>>
endobj

4 0 obj
<</Parent 3 0 R/Contents 2 0 R/Type/Page/Resources<</ProcSet [/PDF /Text /ImageB /ImageC /ImageI]
/Font<</F1 1 0 R>>
>>/MediaBox[0 0 328.5 449.28]>>
endobj

5 0 obj
<</Length1 190044/Length 190044>>stream
--snip TTF stream--
endstream

6 0 obj
<</FontBBox[-558 -270 1168 1047]/CapHeight 713/Type/FontDescriptor/FontFile2 5 0 R/StemV 80/Descent -240/Flags 32/FontName/DroidSans/Ascent 765/ItalicAngle 0>>
endobj

7 0 obj
<</BaseFont/DroidSans/CIDSystemInfo<</Ordering(Identity)/Registry(Adobe)/Supplement 0>>/W [3[259 269]43[701]58[883]71[585 535]79[258]82[577]85[398]]/Type/Font/Subtype/CIDFontType2/FontDescriptor 6 0 R/DW 1000/CIDToGIDMap/Identity>>
endobj

8 0 obj
<</Length 485>>stream
/CIDInit /ProcSet findresource begin
12 dict begin
begincmap
/CIDSystemInfo
<< /Registry (TTX+0)
/Ordering (T42UV)
/Supplement 0
>> def
/CMapName /TTX+0 def
/CMapType 2 def
1 begincodespacerange
<0000><FFFF>
endcodespacerange
9 beginbfrange
<0003><0003><0020>
<0004><0004><0021>
<002b><002b><0048>
<003a><003a><0057>
<0047><0047><0064>
<0048><0048><0065>
<004f><004f><006c>
<0052><0052><006f>
<0055><0055><0072>
endbfrange
endcmap
CMapName currentdict /CMap defineresource pop
end end

endstream
endobj

Cheers,
Armando