[Cuis] Fixed-Width Font
Dan Norton
dnorton at mindspring.com
Sat Jul 25 10:40:19 CDT 2015
Form class>>fromBinaryStream: has firstByte = 66, this is not an error but part of "BM" in the header of the .bmp file.
The "Unsupported format..." error is caused by Cuis wanting biSize = 40 and ImageMagick
putting a different value.
Squeak has BitstreamVeraSansMono, a fixed-width font. Why couldn't that be used to
produce .bmp files instead of ImageMagick? The BM header would be compatible with Cuis
AFAIKT and it might get us a fixed-width font on Cuis.
On 25 Jul 2015 at 13:14, H. Hirzel wrote:
> I did the StrikeFont exercises in Squeak. So it could be that
> Squeak
> has a BMP file reader which is no longer included in Cuis. A thing
> to
> check....
>
> --HH
>
> On 7/25/15, H. Hirzel <hannes.hirzel at gmail.com> wrote:
> > I would try to save the *.bmp file as a *.gif file in Microsoft
> Paint
> > and then try to load it with
> >
> > ImageReadWriter class>>formFromStream:
> >
> > HTH
> >
> > --HH
> >
> > On 7/24/15, Dan Norton <dnorton at mindspring.com> wrote:
> >> On 20 Jul 2015 at 19:33, Juan Vuletich wrote:
> >>
> >>>
> >>> Hi Dan,
> >>>
> >>> On 7/19/2015 10:13 PM, Dan Norton wrote:
> >>> On 19 Jul 2015 at 10:31, Juan Vuletich wrote:
> >>>
> >>> > On 7/18/2015 3:37 PM, Dan Norton wrote:
> >>> > > On 11 Jul 2015 at 13:40, Juan Vuletich wrote:
> >>> > >
> >>> > >> Hi Folks,
> >>> > >>
> >>> > >> It is not too hard to build new StrikeFonts. You need
> to
> >>> build,
> >>> > by
> >>> > >> hand,
> >>> > >> files like the ones in here:
> >>> > >>
> >>> >
> >>>
> https://dl.dropboxusercontent.com/u/13285702/BitmapDejaVuAllSizes.zi
> >>> > >> p
> >>> > >> and learn a bit about stuff like #installDejaVu2 .
> Maybe it
> >>> was
> >>> > with
> >>> > >> this method and the files in this zip that built the
> >>> existing
> >>> > >> instances
> >>> > >> of StrikeFont. Not sure.
> >>> > >>
> >>> > > That's intrigueing but I can't reproduce it. Maybe the
> .bmp
> >>> but
> >>> > where did you get the .txt?
> >>> > >
> >>> > > - Dan
> >>> >
> >>> > I wrote them with a text editor. Check #installDejaVu2
> and
> >>> really
> >>> > try to
> >>> > understand how StrikeFonts work and how they are built
> with
> >>> this
> >>> > method.
> >>> > Maybe you'll become enlightened.
> >>> >
> >>>
> >>> A StrikeFont consists of a characterToGlyphMap, xTable,
> glyphs,
> >>> name, and several
> >>> scalars. StrikeFont class methods create fonts by
> processing
> >>> file pairs assumed to be in the
> >>> "AAFonts" subdirectory. For example:
> >>>
> >>> DejaVu Sans Oblique 14.bmp
> >>> DejaVu Sans Oblique 14.txt
> >>>
> >>> Is one such pair providing the italic (oblique) style for
> >>> 14-point size. There is a pair for every
> >>> font size and style: base, bold, italic, and bold italic.
> >>> Therefore a font such as "DejaVu Sans"
> >>> which is available in the size interval 5 to 24 requires
> 160
> >>> files. The file names are stylized
> >>> and encoded in the StrikeFont class methods.
> >>>
> >>> Glyphs come from the .bmp file. The .txt file is a string
> of
> >>> numbers; the first three specify
> >>> pointSize, ascent, and descent. The rest of the numbers in
> the
> >>> .txt file are used to form the
> >>> xTable, which is the index into the glyphs for a character.
> The
> >>> characterToGlyphMap is an
> >>> array of 256 entries which map a character's ascii value to
> the
> >>> xTable and thence to the
> >>> glyphs.
> >>>
> >>> The bold, italic, and bold italic styles are stashed as
> >>> derivatives of the base and not
> >>> selectable from the current menus.
> >>>
> >>> StrikeFont is a subclass of AbstractFont, which has class
> >>> variables AvailableFonts and
> >>> DefaultFont.
> >>>
> >>> If it can't find a file, StrikeFont will loop.
> >>>
> >>> Great! You got it all.
> >>>
> >>> In regard to creating the .bmp and .txt files, you say, "
> I
> >>> wrote them with a text editor."
> >>> Please tell me which text editor you used. None of mine do
> >>> that.
> >>>
> >>> The bmp files can be created with screen capture program,
> after
> >>> entering suitable text in it. Maybe
> >>> you need to stitch several pieces together, etc. WRT the txt
> files,
> >>> well, the editor didn't do it for
> >>> me. I wrote them. I _typed_ them. Maybe I used some (long lost)
> code
> >>> to look for white columns
> >>> separating glyphs, but I'm not really sure.
> #xTallyPixelValue:orNot:
> >>> and friends are great for this
> >>> kind of stuff.
> >>>
> >>> In any case, it will be easier for you, as you want a
> monospaced
> >>> font. Printing something like (32
> >>> to: 255) collect: [ :ascii | ascii-32 * 9 ] into the file might
> be
> >>> enough.
> >>>
> >>> You have all the pieces at hand. it just requires a bit of
> >>> patience.
> >>>
> >>
> >> Encouraged by this, I have tried cobbling a fixed-width
> StrikeFont from
> >> Courier New which
> >> comes with Windows7. At this point, if some kind of fixed-width
> smudges
> >> would appear then
> >> it would be progress. Here's where I am:
> >>
> >> The immediate problem is an error: 'Unsupported format. Try
> >> "Graphics-Files-Additional.pck.st".' which arises when
> ImageReadWriter
> >> class>>formFromStream: examines the .bmp file.
> >>
> >> Higher in the context, Form class>>fromBinaryStream: has
> firstByte = 66
> >> which I mention
> >> because of the way the .bmp file was made. Here is the process I
> used,
> >> from
> >> the bottom up:
> >>
> >> ImageMagick freeware produces the glyphs but with something
> stubbornly
> >> prepended. The
> >> command line is:
> >> convert -font \windows\fonts\cour.ttf -pointsize 12
> >> label:@characters.txt
> >> courier12.bmp
> >>
> >> Using NotePad, save characters.txt with encoding: UTF-8.
> >>
> >> Paste the character string onto a NotePad
> >>
> >> Copy the character string.
> >>
> >> In a Cuis workspace print:
> >> str := String new writeStream.
> >> (32 to: 255) do: [ :n | str nextPut: n asCharacter]
> >> str contents.
> >>
> >> Code package and files allegedly for courier strike fonts are
> attached if
> >> you're
> >> interested.
> >>
> >> - Dan
> >>
> >>
> >
>
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