diff options
Diffstat (limited to 'tex/context/base/mkiv/font-imp-effects.lua')
| -rw-r--r-- | tex/context/base/mkiv/font-imp-effects.lua | 414 |
1 files changed, 414 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/font-imp-effects.lua b/tex/context/base/mkiv/font-imp-effects.lua new file mode 100644 index 000000000..cc6e4c0bf --- /dev/null +++ b/tex/context/base/mkiv/font-imp-effects.lua @@ -0,0 +1,414 @@ +if not modules then modules = { } end modules ['font-imp-effects'] = { + version = 1.001, + comment = "companion to font-ini.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +-- todo: pickup from goodies: if type(effect) then ... + +local next, type, tonumber = next, type, tonumber +local is_boolean = string.is_boolean + +local fonts = fonts + +local handlers = fonts.handlers +local registerotffeature = handlers.otf.features.register +local registerafmfeature = handlers.afm.features.register + +local settings_to_hash = utilities.parsers.settings_to_hash_colon_too + +local helpers = fonts.helpers +local prependcommands = helpers.prependcommands +local charcommand = helpers.commands.char +local leftcommand = helpers.commands.left +local rightcommand = helpers.commands.right +local upcommand = helpers.commands.up +local downcommand = helpers.commands.down +local dummycommand = helpers.commands.dummy + +----- constructors = fonts.constructors +----- getmathparameter = constructors.getmathparameter +----- setmathparameter = constructors.setmathparameter + +local report_effect = logs.reporter("fonts","effect") +local report_slant = logs.reporter("fonts","slant") +local report_extend = logs.reporter("fonts","extend") +local report_squeeze = logs.reporter("fonts","squeeze") + +local trace = false + +trackers.register("fonts.effect", function(v) trace = v end) +trackers.register("fonts.slant", function(v) trace = v end) +trackers.register("fonts.extend", function(v) trace = v end) +trackers.register("fonts.squeeze",function(v) trace = v end) + +local function initializeslant(tfmdata,value) + value = tonumber(value) + if not value then + value = 0 + elseif value > 1 then + value = 1 + elseif value < -1 then + value = -1 + end + if trace then + report_slant("applying %0.3f",value) + end + tfmdata.parameters.slantfactor = value +end + +local specification = { + name = "slant", + description = "slant glyphs", + initializers = { + base = initializeslant, + node = initializeslant, + } +} + +registerotffeature(specification) +registerafmfeature(specification) + +local function initializeextend(tfmdata,value) + value = tonumber(value) + if not value then + value = 0 + elseif value > 10 then + value = 10 + elseif value < -10 then + value = -10 + end + if trace then + report_extend("applying %0.3f",value) + end + tfmdata.parameters.extendfactor = value +end + +local specification = { + name = "extend", + description = "scale glyphs horizontally", + initializers = { + base = initializeextend, + node = initializeextend, + } +} + +registerotffeature(specification) +registerafmfeature(specification) + +local function initializesqueeze(tfmdata,value) + value = tonumber(value) + if not value then + value = 0 + elseif value > 10 then + value = 10 + elseif value < -10 then + value = -10 + end + if trace then + report_squeeze("applying %0.3f",value) + end + tfmdata.parameters.squeezefactor = value +end + +local specification = { + name = "squeeze", + description = "scale glyphs vertically", + initializers = { + base = initializesqueeze, + node = initializesqueeze, + } +} + +registerotffeature(specification) +registerafmfeature(specification) + +local effects = { + inner = 0, + normal = 0, + outer = 1, + outline = 1, + both = 2, + hidden = 3, +} + +local function initializeeffect(tfmdata,value) + local spec + if type(value) == "number" then + spec = { width = value } + else + spec = settings_to_hash(value) + end + local effect = spec.effect or "both" + local width = tonumber(spec.width) or 0 + local mode = effects[effect] + if not mode then + report_effect("invalid effect %a",effect) + elseif width == 0 and mode == 0 then + report_effect("invalid width %a for effect %a",width,effect) + else + local parameters = tfmdata.parameters + local properties = tfmdata.properties + parameters.mode = mode + parameters.width = width * 1000 + if is_boolean(spec.auto) == true then + local squeeze = 1 - width/20 + local average = (1 - squeeze) * width * 100 + spec.squeeze = squeeze + spec.extend = 1 + width/2 + spec.wdelta = average + spec.hdelta = average/2 + spec.ddelta = average/2 + spec.vshift = average/2 + end + local factor = tonumber(spec.factor) or 0 + local hfactor = tonumber(spec.hfactor) or factor + local vfactor = tonumber(spec.vfactor) or factor + local delta = tonumber(spec.delta) or 1 + local wdelta = tonumber(spec.wdelta) or delta + local hdelta = tonumber(spec.hdelta) or delta + local ddelta = tonumber(spec.ddelta) or hdelta + local vshift = tonumber(spec.vshift) or 0 + local slant = spec.slant + local extend = spec.extend + local squeeze = spec.squeeze + if slant then + initializeslant(tfmdata,slant) + end + if extend then + initializeextend(tfmdata,extend) + end + if squeeze then + initializesqueeze(tfmdata,squeeze) + end + properties.effect = { + effect = effect, + width = width, + factor = factor, + hfactor = hfactor, + vfactor = vfactor, + wdelta = wdelta, + hdelta = hdelta, + ddelta = ddelta, + vshift = vshift, + slant = tfmdata.parameters.slantfactor, + extend = tfmdata.parameters.extendfactor, + squeeze = tfmdata.parameters.squeezefactor, + } + end +end + +local rules = { + "RadicalRuleThickness", + "OverbarRuleThickness", + "FractionRuleThickness", + "UnderbarRuleThickness", +} + +-- local commands = char.commands +-- if commands then +-- local command = commands[1] +-- if command and command[1] == "right" then +-- commands[1] = rightcommand[command[2]-snap] +-- end +-- end + +local function setmathparameters(tfmdata,characters,mathparameters,dx,dy,squeeze) + if delta ~= 0 then + for i=1,#rules do + local name = rules[i] + local value = mathparameters[name] + if value then + mathparameters[name] = (squeeze or 1) * (value + dx) + end + end + end +end + +local function setmathcharacters(tfmdata,characters,mathparameters,dx,dy,squeeze,wdelta,hdelta,ddelta) + + local function wdpatch(char) + if wsnap ~= 0 then + char.width = char.width + wdelta/2 + end + end + + local function htpatch(char) + if hsnap ~= 0 then + local height = char.height + if height then + char.height = char.height + 2 * dy + end + end + end + + local character = characters[0x221A] + + if character and character.next then +-- print("base char",0x221A,table.sequenced(character)) + local char = character + local next = character.next + wdpatch(char) + htpatch(char) + while next do + char = characters[next] + wdpatch(char) + htpatch(char) +-- print("next char",next,table.sequenced(char)) + next = char.next + end + if char then + local v = char.vert_variants + if v then + local top = v[#v] + if top then + local char = characters[top.glyph] +-- print("top char",top.glyph,table.sequenced(char)) + htpatch(char) + end + end + end + end +end + +-- local show_effect = { "lua", function(f,c) +-- report_effect("font id %i, char %C",f,c) +-- inspect(fonts.hashes.characters[f][c]) +-- end } + +-- local show_effect = { "lua", "print('!')" } + +local function manipulateeffect(tfmdata) + local effect = tfmdata.properties.effect + if effect then + local characters = tfmdata.characters + local parameters = tfmdata.parameters + local mathparameters = tfmdata.mathparameters + local multiplier = effect.width * 100 + local factor = parameters.factor + local hfactor = parameters.hfactor + local vfactor = parameters.vfactor + local wdelta = effect.wdelta * hfactor * multiplier + local hdelta = effect.hdelta * vfactor * multiplier + local ddelta = effect.ddelta * vfactor * multiplier + local vshift = effect.vshift * vfactor * multiplier + local squeeze = effect.squeeze + local hshift = wdelta / 2 + local dx = multiplier * vfactor + local dy = vshift + local factor = (1 + effect.factor) * factor + local hfactor = (1 + effect.hfactor) * hfactor + local vfactor = (1 + effect.vfactor) * vfactor + local vshift = vshift ~= 0 and upcommand[vshift] or false + for unicode, character in next, characters do + local oldwidth = character.width + local oldheight = character.height + local olddepth = character.depth + if oldwidth and oldwidth > 0 then + character.width = oldwidth + wdelta + local commands = character.commands + local hshift = rightcommand[hshift] + if vshift then + if commands then + prependcommands ( commands, +-- show_effect, + hshift, + vshift + ) + else + character.commands = { +-- show_effect, + hshift, + vshift, + charcommand[unicode] + } + end + else + if commands then + prependcommands ( commands, +-- show_effect, + hshift + ) + else + character.commands = { +-- show_effect, + hshift, + charcommand[unicode] + } + end + end + end + if oldheight and oldheight > 0 then + character.height = oldheight + hdelta + end + if olddepth and olddepth > 0 then + character.depth = olddepth + ddelta + end + end + if mathparameters then + setmathparameters(tfmdata,characters,mathparameters,dx,dy,squeeze) + setmathcharacters(tfmdata,characters,mathparameters,dx,dy,squeeze,wdelta,hdelta,ddelta) + end + parameters.factor = factor + parameters.hfactor = hfactor + parameters.vfactor = vfactor + if trace then + report_effect("applying") + report_effect(" effect : %s", effect.effect) + report_effect(" width : %s => %s", effect.width, multiplier) + report_effect(" factor : %s => %s", effect.factor, factor ) + report_effect(" hfactor : %s => %s", effect.hfactor,hfactor) + report_effect(" vfactor : %s => %s", effect.vfactor,vfactor) + report_effect(" wdelta : %s => %s", effect.wdelta, wdelta) + report_effect(" hdelta : %s => %s", effect.hdelta, hdelta) + report_effect(" ddelta : %s => %s", effect.ddelta, ddelta) + end + end +end + +local specification = { + name = "effect", + description = "apply effects to glyphs", + initializers = { + base = initializeeffect, + node = initializeeffect, + }, + manipulators = { + base = manipulateeffect, + node = manipulateeffect, + }, +} + +registerotffeature(specification) +registerafmfeature(specification) + +local function initializeoutline(tfmdata,value) + value = tonumber(value) + if not value then + value = 0 + else + value = tonumber(value) or 0 + end + local parameters = tfmdata.parameters + local properties = tfmdata.properties + parameters.mode = effects.outline + parameters.width = value * 1000 + properties.effect = { + effect = effect, + width = width, + } +end + +local specification = { + name = "outline", + description = "outline glyphs", + initializers = { + base = initializeoutline, + node = initializeoutline, + } +} + +registerotffeature(specification) +registerafmfeature(specification) |