Develop Reference

pdfbox: how to load a font once and use it many times?

I am trying to create a lot of pdf files in a loop.
for(int i=0; i<10000; ++i){
PDDocument doc = PDDocument.load(inputstream);
PDPage page = doc.getPage(0);
PDPageContentStream content = new PDPageContentStream(doc, page, PDPageContentStream.AppendMode.APPEND, true, true);
content.beginText();
//what happens here?
PDFont font = PDType0Font.load(doc, Thread.currentThread().getContextClassLoader().getResourceAsStream("font/simsun.ttf") );
content.setFont(font, 10);
//...
doc.save(outstream);
doc.close();
}
what does it happen by calling PDType0Font.load... ? Because the ttf file is large (10M), will it create ephemeral big objects of font 10000 times? If so, is there a way to make the font as embedded as PDType1Font, so I can just load it once and use it many times in the loop?
I encountered a full GC problem here, and I'm trying to figure it out.

Create the font at the fontbox level:
TrueTypeFont ttf = new TTFParser().parse(...);
You can now reuse ttf in different PDDocument objects like this:
PDFont font = PDType0Font.load(doc, ttf, true);
When done with all documents, don't forget to close ttf.
See also PDFontTest.testPDFBox3826() in the source code.

Subsetting OpenType Collection font in pdfbox

I'm trying to embed a subset of noto-regular in my code. but I keeping on getting:
java.lang.UnsupportedOperationException: OTF fonts do not have a glyf table
at org.apache.fontbox.ttf.OpenTypeFont.getGlyph(OpenTypeFont.java:66)
at org.apache.fontbox.ttf.TTFSubsetter.addCompoundReferences(TTFSubsetter.java:481)
at org.apache.fontbox.ttf.TTFSubsetter.getGIDMap(TTFSubsetter.java:136)
at org.apache.pdfbox.pdmodel.font.TrueTypeEmbedder.subset(TrueTypeEmbedder.java:306)
at org.apache.pdfbox.pdmodel.font.PDType0Font.subset(PDType0Font.java:162)
at org.apache.pdfbox.pdmodel.PDDocument.save(PDDocument.java:1138)
I downloaded the font file NotoSansCJK-Regular.ttc from https://www.google.com/get/noto/help/cjk/
Font subsetting works for .ttf fonts, as I haven't had any issues if the document I saved contains no special characters.
EDIT
It appears that true type collection fonts can have shared glyf table (makes sense since the font collection contains Japanese glyphs). So the individual PDType0Font parsed from .ttc can't be treated as an individual font.
I loaded the font using:
ttc.processAllFonts((TrueTypeFont ttf) -> {
PDFont font = PDType0Font.load(doc, ttf, true);
fontList.add(font);
});
I'm guessing that there are extra work I needed to do to make this work, but I can't find any code samples anywhere.
EDIT2
Seems like the problem is that when subsetting specific OpenType font files, (which font collection contains) turns on an internal flag isPostScript. The flag is then checked and process is aborted when getGlyph() is called.
The following code generates the glyf table error when creating the pdf documents
// downloaded from Noto project site
String OTF_FILE = "./src/test/resources/NotoSansJP-Regular.otf";
PDDocument doc = new PDDocument();
PDFont otf = null;
try (InputStream inputStream = new FileInputStream(new File(OTF_FILE))) {
otf = PDType0Font.load(doc, new OTFParser().parse(inputStream), true);
PDPage page = new PDPage();
PDPageContentStream stream = new PDPageContentStream(doc, page);
stream.setFont(otf, 10f);
stream.beginText();
stream.newLineAtOffset(100f, 600f);
stream.showText("二ろほス反2化みた大第リきやね景手ハニエ者性ルヤリウ円脱");
stream.endText();
stream.close();
doc.addPage(page);
doc.save("test.pdf");
} catch (IOException iox) {
// failed
}
but it will generate the pdf fine as soon as I set the subsetting parameter to true in the PDType0Font.load call
Similarily if I load the otf font through the collection:
String OTF_FILE = "./src/test/resources/NotoSansCJK-Regular.ttc";
PDDocument doc = new PDDocument();
PDFont otf = null;
try (InputStream inputStream = new FileInputStream(new File(OTF_FILE))) {
TrueTypeCollection ttc = new TrueTypeCollection(inputStream);
otf = PDType0Font.load(doc, ttc.getFontByName("NotoSansCJKjp-Regular"), true);
PDPage page = new PDPage();
PDPageContentStream stream = new PDPageContentStream(doc, page);
stream.setFont(otf, 10f);
stream.beginText();
stream.newLineAtOffset(100f, 600f);
stream.showText("二ろほス反2化みた大第リきやね景手ハニエ者性ルヤリウ円脱");
stream.endText();
stream.close();
doc.addPage(page);
doc.save("test.pdf");
} catch (IOException iox) {
// failed
}
I either need to embed the whole font or subsetting will throw the error
EDIT 3
I ended up circumvent this by downloading the OTF font from "Language-specific OpenType/CFF (OTF)", which contains characters from all 4 regions and converted it using otf2ttf from fonttools

Render Type3 font character as image using PDFBox

In my project, I'm stuck with necessity to parse PDF file, that contains some characters rendered by Type3 fonts. So, what I need to do is to render such characters into BufferedImage for further processing.
I'm not sure if I'm looking in correct way, but I'm trying to get PDType3CharProc for such characters:
PDType3Font font = (PDType3Font)textPosition.getFont();
PDType3CharProc charProc = font.getCharProc(textPosition.getCharacterCodes()[0]);
and the input stream of this procedure contains following data:
54 0 1 -1 50 43 d1
q
49 0 0 44 1.1 -1.1 cm
BI
/W 49
/H 44
/BPC 1
/IM true
ID
<some binary data here>
EI
Q
but unfortunately I don't have any idea how can I use this data to render character into an image using PDFBox (or any other Java libraries).
Am I looking in correct direction, and what can I do with this data?
If not, are there some other tools that can solve such problem?

Unfortunately PDFBox out-of-the-box does not provide a class to render contents of arbitrary XObjects (like the type 3 font char procs), at least as far as I can see.
But it does provide a class for rendering complete PDF pages; thus, to render a given type 3 font glyph, one can simply create a page containing only that glyph and render this temporary page!
Assuming, for example, the type 3 font is defined on the first page of a PDDocument document and has name F1, all its char procs can be rendered like this:
PDPage page = document.getPage(0);
PDResources pageResources = page.getResources();
COSName f1Name = COSName.getPDFName("F1");
PDType3Font fontF1 = (PDType3Font) pageResources.getFont(f1Name);
Map<String, Integer> f1NameToCode = fontF1.getEncoding().getNameToCodeMap();
COSDictionary charProcsDictionary = fontF1.getCharProcs();
for (COSName key : charProcsDictionary.keySet())
{
COSStream stream = (COSStream) charProcsDictionary.getDictionaryObject(key);
PDType3CharProc charProc = new PDType3CharProc(fontF1, stream);
PDRectangle bbox = charProc.getGlyphBBox();
if (bbox == null)
bbox = charProc.getBBox();
Integer code = f1NameToCode.get(key.getName());
if (code != null)
{
PDDocument charDocument = new PDDocument();
PDPage charPage = new PDPage(bbox);
charDocument.addPage(charPage);
charPage.setResources(pageResources);
PDPageContentStream charContentStream = new PDPageContentStream(charDocument, charPage);
charContentStream.beginText();
charContentStream.setFont(fontF1, bbox.getHeight());
charContentStream.getOutput().write(String.format("<%2X> Tj\n", code).getBytes());
charContentStream.endText();
charContentStream.close();
File result = new File(RESULT_FOLDER, String.format("4700198773-%s-%s.png", key.getName(), code));
PDFRenderer renderer = new PDFRenderer(charDocument);
BufferedImage image = renderer.renderImageWithDPI(0, 96);
ImageIO.write(image, "PNG", result);
charDocument.close();
}
}
(RenderType3Character.java test method testRender4700198773)
Considering the textPosition variable in the OP's code, he quite likely attempts this from a text extraction use case. Thus, he'll have to either pre-generate the bitmaps as above and simply look them up by name or adapt the code to match the available information in his use case (e.g. he might not have the original page at hand, only the font object; in that case he cannot copy the resources of the original page but instead may create a new resources object and add the font object to it).
Unfortunately the OP did not provide a sample PDF. Thus I used one from another stack overflow question, 4700198773.pdf from extract text with custom font result non readble for my test. There obviously might remain issues with the OP's own files.

I stumbled upon the same issue and I was able to render Type3 font by modifying PDFRenderer and the underlying PageDrawer:
class Type3PDFRenderer extends PDFRenderer
{
private PDFont font;
public Type3PDFRenderer(PDDocument document, PDFont font)
{
super(document);
this.font = font;
}
#Override
protected PageDrawer createPageDrawer(PageDrawerParameters parameters) throws IOException
{
FontType3PageDrawer pd = new FontType3PageDrawer(parameters, this.font);
pd.setAnnotationFilter(super.getAnnotationsFilter());//as done in the super class
return pd;
}
}
class FontType3PageDrawer extends PageDrawer
{
private PDFont font;
public FontType3PageDrawer(PageDrawerParameters parameters, PDFont font) throws IOException
{
super(parameters);
this.font = font;
}
#Override
public PDGraphicsState getGraphicsState()
{
PDGraphicsState gs = super.getGraphicsState();
gs.getTextState().setFont(this.font);
return gs;
}
}
Simply use Type3PDFRenderer instead of PDFRendered. Of course if you have multiple fonts this needs some more modification to handle them.
Edit: tested with pdfbox 2.0.9

How to add text watermark to pdf in Java using Apache PDFBox?

I am not getting any tutorial for adding a text watermark in a PDF file? Can you all please guide me, I am very new to PDFBOX.
Its not duplicate, the link in the comment didn't help me. I want to add text, not an image to the pdf.

Here is an example using PDFBox 2.0.2. This will load a PDF and write some text in the bottom right corner in a red transparent font. If it is a multiple page PDF the watermark will appear on every page. It might not be production ready, as I am not sure if there are some additional null conditions that need to be checked, but it should get you running in the right direction.
Keep in mind that this particular block of code will not modify the original PDF, but will create a new PDF using the Tmp_(filename) as the output.
private static void watermarkPDF (File fileStored) {
File tmpPDF;
PDDocument doc;
tmpPDF = new File(fileStored.getParent() + System.getProperty("file.separator") +"Tmp_"+fileStored.getName());
doc = PDDocument.load(fileStored);
for(PDPage page:doc.getPages()){
PDPageContentStream cs = new PDPageContentStream(doc, page, AppendMode.APPEND, true, true);
String ts = "Some sample text";
PDFont font = PDType1Font.HELVETICA_BOLD;
float fontSize = 14.0f;
PDResources resources = page.getResources();
PDExtendedGraphicsState r0 = new PDExtendedGraphicsState();
r0.setNonStrokingAlphaConstant(0.5f);
cs.setGraphicsStateParameters(r0);
cs.setNonStrokingColor(255,0,0);//Red
cs.beginText();
cs.setFont(font, fontSize);
cs.setTextMatrix(Matrix.getTranslateInstance(0f,0f));
cs.showText(ts);
cs.endText();
}
cs.close();
}
doc.save(tmpPDF);
}

PDFBox - Single drawString method call to generate both normal and bold font

I am using PDFBox in my java application to generate PDF files and I am a newbie in this area. I have a requirement, where the output text content is in a variable. The output text should be a mixed of both BOLD and Normal fonts.
Code Snippet
PDDocument document = new PDDocument();
PDPage page = new PDPage();
document.addPage( page );
PDFont font = PDType1Font.HELVETICA_BOLD;
PDPageContentStream contentStream = new PDPageContentStream(document, page);
float xStartPos = 100;
float yStartPos = 650;
contentStream.beginText();
contentStream.setFont( font, 12 );
contentStream.moveTextPositionByAmount( xStartPos, yStartPos );
String displayText = "Hello world";
contentStream.drawString(displayText);
contentStream.endText();
In the above code Hello should be in bold font and world should be in normal font. My requirement is using the single drawString call, this should be achieved. Any one can help?
Thanks in advance.

A single drawString method call to generate both normal and bold font (as you mention in the question headline) is not possible because PDPageContentStream.drawString essentially creates one operation in the PDF drawing the whole parameter string using the current font. Thus, multiple drawString calls are required.
In your case e.g.:
contentStream.beginText();
contentStream.moveTextPositionByAmount( xStartPos, yStartPos );
contentStream.setFont( PDType1Font.HELVETICA_BOLD, 12 );
contentStream.drawString("Hello ");
contentStream.setFont( PDType1Font.HELVETICA, 12 );
contentStream.drawString("world");
contentStream.endText();