Tag Archives: ascii

(Not Just) Firefox’s “Pile of Poo” Easter Egg: šŸ’©

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For a reason best known to the Unicode consortium, there is now the symbol U+1F4A9 “Pile of Poo”: šŸ’©. If you happen to create a web page with this delightful character in the title, Firefox does something special:

Yep, that’s a smiley face poo, a bit like Mr Hankey. Oh dear.

Actually, it seems it might be an OS X Emoji thing, because Safari renders it in the title like that, and in the text as (enlarged to show texture):

iOS has it covered too:

Blackberry’s browser just shows a small black square. Android, rather sensibly, shows an empty square. It must be an Apple thing.

ā€œThanksā€ go to tchrist‘s comment in unicode – Why does modern Perl avoid UTF-8 by default? for alerting me to this character, and letting us know about the Symbola font that supports it. Yeah, cheers Tom …

creating a TrueType font from your handwriting with your scanner, your printer, and FontForge

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This looks more than a bit like my handwriting

because it is my handwriting! Sure, the spacing of the punctuation needs major work, and I could have fiddled with the baseline alignment, but it’s legible, which is more than can usually be said of my own chicken-scratch.

This process is a little fiddly, but all the parts are free, and it uses free software. This all runs from the command line. I wrote and tested this on a Mac (with some packages installed from DarwinPorts), but it should run on Linux. It might need Cygwin under Windows; I don’t know.

Software you will need:

  • a working Perl interpreter
  • NetPBM, the free graphics converter toolkit
  • FontForge, the amazing free font editor. (Yes, I said amazing. I didn’t say easy to use …)
  • autotrace or potrace so that FontForge can convert the scanned bitmaps to vectors
  • some kind of bitmap editor.

You will need to download

  • fonttrace.pl – splits up a (very particular) bitmap grid into character cells
  • chargrid.pdf – the font grid template for printing

Procedure:

  1. Print at least the first page of chargrid.pdf. The second page is guidelines that you can place under the page. This doesn’t work very well if you use thick paper.
  2. Draw your characters in the boxes. Keep well within the lines; there’s nothing clever about how fonttrace.pl splits the page up.
  3. Scan the page, making sure the page is as straight as possible and the scanner glass is spotless. You want to scan in greyscale or black and white.
  4. Crop/rotate/skew the page so the very corners of the character grid table are at the edges of the image, like this: I find it helpful at this stage to clean off any specks/macules. I also scale and threshold the image so I get a very dark image at 300-600dpi.
  5. Save the image as a Portable Bitmap (PBM). It has to be 1-bit black and white. You might want to put a new font in a new folder, as the next stage creates lots of files, and might overwrite your old work.
  6. Run fonttrace.pl like this:
    fonttrace.pl infile.pbm | sh
    If you miss out the call to the shell, it will just print out the commands it would have run to create the character tiles.
  7. This should result in a bunch of files called uniNNNN.png in the current folder, like these:
    W

    uni0057.png

    i

    uni0069.png

    s

    uni0073.png

    p

    uni0070.png

    y

    uni0079.png

  8. Fire up FontForge. You’ll want to create a New font. Now Fileā†’Import…, and use Image Template as the format. Point it at the first of the image tiles (uni0020.png), and Import.
  9. Select Editā†’Selectā†’All, then Elementā†’Autotrace. You’ll see your characters appear in the main window.
  10. And that’s – almost – it. You’ll need to fiddle with (auto)spacing, set up some kerning tables, set the font name (in Elementā†’Font Info … – and you’ll probably want to set the em scale to 1024, as TrueType fonts like powers of two), then Fileā†’Generate Fonts. Fontforge will throw you a bunch of warnings and suggestions, and I’d recommend reading the help to find out what they mean.

There are a couple of limitations to the process:

  • Most of the above process could be written into a FontForge script to make things easier
  • Only ASCII characters are supported, to keep the number of scanned pages simple. Sorry. I’d really like to support more. You’re free to build on this.

Lastly, a couple of extra files:

  • CrapHand2.pbm – a sample array drawn by me, gzipped for your inconvenience (and no, I don’t know why WordPress is changing the file extension to ‘pbm_’ either).
  • chargrid.ods – the OpenOffice spreadsheet used to make chargrid.pdf

Have fun! Write nicely!