Letter-spacing / kerning between words in PDFRenderer
Hi,
To begin with: we use FOP 0.20.4, and this mail is about a partly fix
for missing letter-spacing/kerning between words in PDF's.
In PDF's produced with FOP compared to PDF's from other an other source,
we noticed that FOP doesn't apply kerning (letter-spacing) to spaces
between words, most obviously at the end of sentences. I.e., no kerning
is applied to the character pairs
word-characterspace (for example, . ) and
spaceword-character (for example, V).
The cause, or in any case, the place where it can (partly?) be fixed,
can be found in the method renderWordArea(WordArea area) in
PDFRenderer.java.
The latter case (spaceword-character) I could easily fix. All I
had to do was move the lines
String s;
if (area.getPageNumberID()
!= null) {// this text is a page number, so resolve it
s = idReferences.getPageNumber(area.getPageNumberID());
if (s == null) {
s = ;
}
} else {
s = area.getText();
}
int l = s.length();
up a few lines so they precede 'if (!textOpen || bl != prevWordY)',
and add the following lines in the else-part of
'if (!textOpen || bl != prevWordY)':
if (kerningAvailable l 0) {
addKerning(pdf, (new Integer((int) ' ')),
(new Integer((int) area.getFontState().mapChar(s.charAt(0,
kerning, startText, endText);
}
I've attached the complete code of the method renderWordArea separately.
But..., that's only half of the solution! The first case
(word-characterspace) is more difficult. I think that in
renderWordArea we can not be sure that a space is following the word we
just rendered - or can we? And we don't have the last character of the
previous word available. Anyone has any ideas?
Regards, Joop Vriend.
/**
* render inline area to PDF
*
* @param area inline area to render
*/
public void renderWordArea(WordArea area) {
synchronized (_wordAreaPDF) {
StringBuffer pdf = _wordAreaPDF;
pdf.setLength(0);
Hashtable kerning = null;
boolean kerningAvailable = false;
kerning = area.getFontState().getKerning();
if (kerning != null !kerning.isEmpty()) {
kerningAvailable = true;
}
String name = area.getFontState().getFontName();
int size = area.getFontState().getFontSize();
// This assumes that *all* CIDFonts use a /ToUnicode mapping
boolean useMultiByte = false;
Font f = (Font) area.getFontState().
getFontInfo().getFonts().get(name);
if (f instanceof LazyFont) {
if (((LazyFont) f).getRealFont() instanceof CIDFont) {
useMultiByte = true;
}
} else if (f instanceof CIDFont) {
useMultiByte = true;
}
// String startText = useMultiByte ? FEFF : (;
String startText = useMultiByte ? : (;
String endText = useMultiByte ? : ) ;
if ((!name.equals(this.currentFontName))
|| (size != this.currentFontSize)) {
closeText();
this.currentFontName = name;
this.currentFontSize = size;
pdf = pdf.append(/ + name + + ((float)size / 1000) + Tf\n);
}
//Do letter spacing (must be outside of [..] TJ)
float letterspacing =
((float) area.getFontState().getLetterSpacing()) / 1000;
if (letterspacing != this.currentLetterSpacing) {
this.currentLetterSpacing = letterspacing;
closeText();
pdf.append(letterspacing).append( Tc\n);
}
PDFColor areaColor = null;
if (this.currentFill instanceof PDFColor) {
areaColor = (PDFColor) this.currentFill;
}
if (areaColor == null || areaColor.red() != (double) area.getRed()
|| areaColor.green() != (double) area.getGreen()
|| areaColor.blue() != (double) area.getBlue()) {
areaColor = new PDFColor((double) area.getRed(),
(double) area.getGreen(),
(double) area.getBlue());
closeText();
this.currentFill = areaColor;
pdf.append(this.currentFill.getColorSpaceOut(true));
}
int rx = this.currentXPosition;
int bl = this.currentYPosition;
addWordLines(area, rx, bl, size, areaColor);
String s;
if (area.getPageNumberID() != null) {// this text is a page number, so
resolve it
s = idReferences.getPageNumber(area.getPageNumberID());
if (s == null) {
s = ;
}
} else {
s = area.getText();
}
int l = s.length();
if (!textOpen || bl != prevWordY) {
closeText();
pdf.append(1 0 0 1 + (rx / 1000f) + + (bl / 1000f)
+ Tm [ + startText);
prevWordY = bl;
textOpen = true;
} else {
// express the space between words in thousandths of an em
Re: Letter-spacing / kerning between words in PDFRenderer
Joop Vriend wrote: To begin with: we use FOP 0.20.4, and this mail is about a partly fix for missing letter-spacing/kerning between words in PDF's. Well, thanks for the effort but this patch wont make it into FOP soon, mainly because the layout core doesn't take kerning into account at all, which needs to be fixed first. Also, if I understand you correctly, kerning should also be applied for the case (emDiff -33000), and text decoration position as well as the rx and word width should be compensated for the kerning. But..., that's only half of the solution! The first case (word-characterspace) is more difficult. Not really: keep the text of the last rendered word in lastWord or something and add the kerning correction to the current rx respective the space. The lastWord must be cleared if something special like an image is rendered in between. J.Pietschmann - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Letter Spacing
Hi All, I want to increase the letter spacing within words in order to shrink or expand the word to fit into a specific width. Is it possible in fop 0.20.4??? thanks in advance. regards Balajee Chandrasekaran Software Engineer Majesco Software Inc. Phone : 91-22-5695 Extn No 7911 Change Everybody wants to do something to help, But nobody wants to be the first. Pearl Bailey (1918-1990), American Vocalist MASTEK Investing in relationships In the US, we're called MAJESCO ~~ Opinions expressed in this e-mail are those of the individual and not that of Mastek Limited, unless specifically indicated to that effect. Mastek Limited does not accept any responsibility or liability for it. This e-mail and attachments (if any) transmitted with it are confidential and/or privileged and solely for the use of the intended person or entity to which it is addressed. Any review, re-transmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. This e-mail and its attachments have been scanned for the presence of computer viruses. It is the responsibility of the recipient to run the virus check on e-mails and attachments before opening them. If you have received this e-mail in error, kindly delete this e-mail from all computers. ~~
RE: Letter Spacing
Hi, I made changes as specified in the example, But I was only able to increase or decrease the space between words and not between Characters, If i have to increase or decrease space between characters what do i need to do?? -Original Message- From: Christian Geisert [mailto:[EMAIL PROTECTED] Sent: Friday, November 08, 2002 3:34 PM To: [EMAIL PROTECTED] Subject: Re: Letter Spacing Balajee Chandrasekaran wrote: Hi All, I want to increase the letter spacing within words in order to shrink or expand the word to fit into a specific width. Is it possible in fop 0.20.4??? Yes, have a look at docs/examples/fo/textdeko.fo Christian MASTEK Investing in relationships In the US, we're called MAJESCO ~~ Opinions expressed in this e-mail are those of the individual and not that of Mastek Limited, unless specifically indicated to that effect. Mastek Limited does not accept any responsibility or liability for it. This e-mail and attachments (if any) transmitted with it are confidential and/or privileged and solely for the use of the intended person or entity to which it is addressed. Any review, re-transmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. This e-mail and its attachments have been scanned for the presence of computer viruses. It is the responsibility of the recipient to run the virus check on e-mails and attachments before opening them. If you have received this e-mail in error, kindly delete this e-mail from all computers. ~~
