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Overview
Comment:Fixed a bug in the calculation of the font bounding box with matching change to the seven segment font definition. This showed in Windows by the font being clipped at the baseline instead of allowing the descenders in the comman and colon to show.
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SHA1:76c607c34152662e45c153178985159065fb597c
User & Date: Ross 2015-12-31 01:05:03
Context
2015-12-31
01:52
Add a demostration of how to make kerning pairs. check-in: fd4cf2422a user: Ross tags: trunk
01:05
Fixed a bug in the calculation of the font bounding box with matching change to the seven segment font definition. This showed in Windows by the font being clipped at the baseline instead of allowing the descenders in the comman and colon to show. check-in: 76c607c341 user: Ross tags: trunk
2015-12-30
01:19
Add a basic command line parser based on the Penlight library pl.lapp module, and use it to check arguments, produce a usage message, and implement a proper --verbose option. check-in: 9a99a4c5e4 user: Ross tags: trunk
Changes
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Changes to src/sevensegment.dotfont. 

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        Glyph{unicode=0x41, pat='abc efg', name='A'},
        Glyph{unicode=0x42, pat='  cdefg', name='B'},
        Glyph{unicode=0x43, pat='a  def ', name='C'},
        Glyph{unicode=0x44, pat=' bcde g', name='D'},
        Glyph{unicode=0x45, pat='a  defg', name='E'},
        Glyph{unicode=0x46, pat='a   efg', name='F'},
        Glyph{unicode=0x2E, pat='h', name='period', lsb=704},
        Glyph{unicode=0x2C, pat='hi', name='comma', lsb=704},
        Glyph{unicode=0x3A, pat='hj', name='colon', lsb=704},
        Glyph{unicode=0x3B, pat='hij', name='semicolon', lsb=704},
        Glyph{unicode=0x23, pat='abcdefghij', name='numbersign', lsb=0},
    },

    --[[ Set the strings. 

    Note that ffam, fsub, ufid, name, vers, and PSnm are required by Windows.
    Of those, fsub defaults to 'Regular' and name gets a sensible defaults based
    on ffam and fsub.








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        Glyph{unicode=0x41, pat='abc efg', name='A'},
        Glyph{unicode=0x42, pat='  cdefg', name='B'},
        Glyph{unicode=0x43, pat='a  def ', name='C'},
        Glyph{unicode=0x44, pat=' bcde g', name='D'},
        Glyph{unicode=0x45, pat='a  defg', name='E'},
        Glyph{unicode=0x46, pat='a   efg', name='F'},
        Glyph{unicode=0x2E, pat='h', name='period', lsb=704},
        Glyph{unicode=0x2C, pat='hi', name='comma', lsb=704, d=-128},
        Glyph{unicode=0x3A, pat='hj', name='colon', lsb=704},
        Glyph{unicode=0x3B, pat='hij', name='semicolon', lsb=704, d=-128},
        Glyph{unicode=0x23, pat='abcdefghij', name='numbersign', lsb=0, d=-128},
    },

    --[[ Set the strings. 

    Note that ffam, fsub, ufid, name, vers, and PSnm are required by Windows.
    Of those, fsub defaults to 'Regular' and name gets a sensible defaults based
    on ffam and fsub.

Changes to src/ttfont.lua. 

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require "luaXml"
if not xml then xml = require "luaXml" end
local X = xml.new
local M={ _NAME=(...) }
package.loaded[M._NAME] = M
local ttx = require 'ttxml'


--local ttfcmap = require 'ttfcmap'
local ttfhead = require 'ttfhead'
local ttfhhea = require 'ttfhhea'
--local ttfhmtx = require 'ttfhmtx'
--local ttfloca = require 'ttfloca' -- created entirely by the TTX compiler
local ttfmaxp = require 'ttfmaxp'
................................................................................
        end
        glyph:append(xml.new{[0]='instructions',X{[0]='assembly'}})
    end
    
    tables.GlyphOrder:append{[0]="GlyphID", id=tables.nextid, name=glyph.name}
    tables.nextid = tables.nextid + 1
    tables.glyf:append(glyph)
    

    M.minX = M.minX < (t.lsb or 0) and M.minX or t.lsb
    M.maxX = M.maxX > (t.width or 0) and M.maxX or t.width
    M.minY = M.minY < (t.d or 0) and M.minY or t.d
    M.maxY = M.maxY > (t.a or 0) and M.maxY or t.a
    
    tables.hmtx:append{[0]='mtx', name=glyph.name, width=t.width, lsb=t.lsb}
end

-- standards recommmend that .notdef look like an empty box, a box 
-- with an X in it, or a box with a '?' in it. Because the diagonal 
-- lines will stand out from the dots making up all other glyphs more
................................................................................
function M.SetNames(t)
    local names
    tables.name, names = ttfname.BuildNameTable(t)
    return names
end

function M.GetFont()





    
    ttfhhea.ascent = M.maxY
    ttfos_2.sTypoAscender = M.maxY
    ttfos_2.usWinAscent = M.maxY
    
    ttfhhea.descent = M.minY
    ttfos_2.sTypoDescender = M.minY








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require "luaXml"
if not xml then xml = require "luaXml" end
local X = xml.new
local M={ _NAME=(...) }
package.loaded[M._NAME] = M
local ttx = require 'ttxml'
local min,max = math.min, math.max

--local ttfcmap = require 'ttfcmap'
local ttfhead = require 'ttfhead'
local ttfhhea = require 'ttfhhea'
--local ttfhmtx = require 'ttfhmtx'
--local ttfloca = require 'ttfloca' -- created entirely by the TTX compiler
local ttfmaxp = require 'ttfmaxp'
................................................................................
        end
        glyph:append(xml.new{[0]='instructions',X{[0]='assembly'}})
    end
    
    tables.GlyphOrder:append{[0]="GlyphID", id=tables.nextid, name=glyph.name}
    tables.nextid = tables.nextid + 1
    tables.glyf:append(glyph)

    M.minX = min(M.minX, t.lsb or 0)
    M.maxX = max(M.maxX, t.width or 0)
    M.minY = min(M.minY, t.d or 0)
    M.maxY = max(M.maxY, t.a or 0)

    
    tables.hmtx:append{[0]='mtx', name=glyph.name, width=t.width, lsb=t.lsb}
end

-- standards recommmend that .notdef look like an empty box, a box 
-- with an X in it, or a box with a '?' in it. Because the diagonal 
-- lines will stand out from the dots making up all other glyphs more
................................................................................
function M.SetNames(t)
    local names
    tables.name, names = ttfname.BuildNameTable(t)
    return names
end

function M.GetFont()
    
    ttfhead.xMin = M.minX
    ttfhead.yMin = M.minY
    ttfhead.xMax = M.maxX
    ttfhead.yMax = M.maxY
    
    ttfhhea.ascent = M.maxY
    ttfos_2.sTypoAscender = M.maxY
    ttfos_2.usWinAscent = M.maxY
    
    ttfhhea.descent = M.minY
    ttfos_2.sTypoDescender = M.minY

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