[reportlab-users] [PATCH] Add TTF Embedding Option

[Robin Becker]

Yoann Roman wrote:

> Per the earlier discussion (see "Disable TTF Embedding"), I was looking 

> for a way to replicate Acrobat's "never embed" font option in RL.

> 

> The only patch needed for TrueType fonts was to ttfonts.py. The default 

> behavior does not change; this adds an optional "embed" argument to 

> TTFont that, if explicitly set to 0, will prevent the font embedding.

> 

> I wasn't sure if the encoding was necessary. Acrobat specifies it, the 

> spec says its optional, and RL leaves it out for TTFs. I followed RL 

> and left it out.

> 

> I'm certainly no PDF spec expert and don't know if this has unintended 

> side effects. I also realize most people won't need this, but, since it 

> doesn't change the default behavior and is a minimal patch, I don't see 

> any harm in adding it.

> 

......
my earlier suspicions are proved correct. Using more than the first subset 
causes an error

ValueError: redefining named object: 'fontDescriptor:ArialMT'

that is one of our errors related to subsetting.


We are trying to write out text using bytes; that means to use arial 
non-embedded we either need to subset it and make the subsets meaningful in some 
way or we need to regard arial as a T1 font with eg one of the standard adobe 
encodings.

There may be some way to use unicode as the output format, but I don't know 
enough about how adobe reader works with these non-embedded system fonts to 
answer for sure. I don't think we should let this patch go till we can get at 
least this primitive test to work.



> 	def testTTFNoEmbed(self):

> 		if sys.platform!='win32': return

> 		for x in 'windows', 'winnt':

> 			fn = os.path.join('\\'+x,'fonts','arial.ttf')

> 			if os.path.isfile(fn): break

> 			fn = None

> 		if not fn: return

> 		def drawUsingArial(embed=1):

> 			font = TTFont("Arial",fn)

> 			pdfmetrics.registerFont(TTFont("Arial",fn,embed=embed))

> 			c = Canvas(outputfile('test_pdfbase_ttfonts-arial-%s.pdf' % (embed and 'embedded' or 'non-embedded')))

> 			c.drawString(100, 700, 'Testing Arial non-embedded')

> 

> 			# Draw a table of Unicode characters

> 			y = 700-14

> 			c.setFont('Arial', 10)

> 			for i in xrange(0x20,0x132,8):

> 				x = 100

> 				lab='%2.2x: '%i

> 				c.drawString(x,y,lab)

> 				x += font.stringWidth(lab,10)

> 				for j in xrange(i,i+8):

> 					c.drawString(x,y,unichr(j))

> 					x += 15

> 				y -= 14

> 			c.save()

> 			from reportlab.pdfbase.pdfmetrics import _reset

> 			_reset()

> 		drawUsingArial(1)

> 		drawUsingArial(0)



-- 
Robin Becker