diff options
Diffstat (limited to 'tex/context/base/mkiv/font-shp.lua')
| -rw-r--r-- | tex/context/base/mkiv/font-shp.lua | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/font-shp.lua b/tex/context/base/mkiv/font-shp.lua new file mode 100644 index 000000000..92ff70127 --- /dev/null +++ b/tex/context/base/mkiv/font-shp.lua @@ -0,0 +1,193 @@ +if not modules then modules = { } end modules ['font-shp'] = { + 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" +} + +local concat = table.concat +local load, tonumber = load, tonumber + +local otf = fonts.handlers.otf +local afm = fonts.handlers.afm + +local hashes = fonts.hashes +local identifiers = hashes.identifiers + +local version = 0.006 +local cache = containers.define("fonts", "shapes", version, true) + +-- shapes (can be come a separate file at some point) + +local function packoutlines(data,makesequence) + local subfonts = data.subfonts + if subfonts then + for i=1,#subfonts do + packoutlines(subfonts[i],makesequence) + end + return + end + local common = data.segments + if common then + return + end + local glyphs = data.glyphs + if not glyphs then + return + end + if makesequence then + for index=1,#glyphs do + local glyph = glyphs[index] + local segments = glyph.segments + if segments then + local sequence = { } + local nofsequence = 0 + for i=1,#segments do + local segment = segments[i] + local nofsegment = #segment + nofsequence = nofsequence + 1 + sequence[nofsequence] = segment[nofsegment] + for i=1,nofsegment-1 do + nofsequence = nofsequence + 1 + sequence[nofsequence] = segment[i] + end + end + glyph.sequence = sequence + glyph.segments = nil + end + end + else + local hash = { } + local common = { } + local reverse = { } + local last = 0 + for index=1,#glyphs do + local segments = glyphs[index].segments + if segments then + for i=1,#segments do + local h = concat(segments[i]," ") + hash[h] = (hash[h] or 0) + 1 + end + end + end + for index=1,#glyphs do + local segments = glyphs[index].segments + if segments then + for i=1,#segments do + local segment = segments[i] + local h = concat(segment," ") + if hash[h] > 1 then -- minimal one shared in order to hash + local idx = reverse[h] + if not idx then + last = last + 1 + reverse[h] = last + common[last] = segment + idx = last + end + segments[i] = idx + end + end + end + end + if last > 0 then + data.segments = common + end + end +end + +local function unpackoutlines(data) + local subfonts = data.subfonts + if subfonts then + for i=1,#subfonts do + unpackoutlines(subfonts[i]) + end + return + end + local common = data.segments + if not common then + return + end + local glyphs = data.glyphs + if not glyphs then + return + end + for index=1,#glyphs do + local segments = glyphs[index].segments + if segments then + for i=1,#segments do + local c = common[segments[i]] + if c then + segments[i] = c + end + end + end + end + data.segments = nil +end + +-- todo: loaders per format + +local function load(filename,sub) + local base = file.basename(filename) + local name = file.removesuffix(base) + local kind = file.suffix(filename) + local attr = lfs.attributes(filename) + local size = attr and attr.size or 0 + local time = attr and attr.modification or 0 + local sub = tonumber(sub) + + -- fonts.formats + + if size > 0 and (kind == "otf" or kind == "ttf" or kind == "tcc") then + local hash = containers.cleanname(base) -- including suffix + if sub then + hash = hash .. "-" .. sub + end + data = containers.read(cache,hash) + if not data or data.time ~= time or data.size ~= size then + data = otf.readers.loadshapes(filename,sub) + if data then + data.size = size + data.format = data.format or (kind == "otf" and "opentype") or "truetype" + data.time = time + packoutlines(data) + containers.write(cache,hash,data) + data = containers.read(cache,hash) -- frees old mem + end + end + unpackoutlines(data) + elseif size > 0 and (kind == "pfb") then + local hash = containers.cleanname(base) -- including suffix + data = containers.read(cache,hash) + if not data or data.time ~= time or data.size ~= size then + data = afm.readers.loadshapes(filename) + if data then + data.size = size + data.format = "type1" + data.time = time + packoutlines(data) + containers.write(cache,hash,data) + data = containers.read(cache,hash) -- frees old mem + end + end + unpackoutlines(data) + else + data = { + filename = filename, + size = 0, + time = time, + format = "unknown", + units = 1000, + glyphs = { } + } + end + return data +end + +hashes.shapes = table.setmetatableindex(function(t,k) + local d = identifiers[k] + local v = load(d.properties.filename,d.subindex) + t[k] = v + return v +end) |