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koreader/frontend/ui/font.lua

165 lines
4.6 KiB
Lua

--[[--
Font module.
]]
local lfs = require("libs/libkoreader-lfs")
local Freetype = require("ffi/freetype")
local Screen = require("device").screen
local Device = require("device")
local logger = require("logger")
local Font = {
fontmap = {
-- default font for menu contents
cfont = "noto/NotoSans-Regular.ttf",
-- default font for title
--tfont = "NimbusSanL-BoldItal.cff",
tfont = "noto/NotoSans-Bold.ttf",
-- default font for footer
ffont = "noto/NotoSans-Regular.ttf",
-- default font for reading position info
rifont = "noto/NotoSans-Regular.ttf",
-- default font for pagination display
pgfont = "noto/NotoSans-Regular.ttf",
-- selectmenu: font for item shortcut
scfont = "droid/DroidSansMono.ttf",
-- help page: font for displaying keys
hpkfont = "droid/DroidSansMono.ttf",
-- font for displaying help messages
hfont = "noto/NotoSans-Regular.ttf",
-- font for displaying input content
-- we have to use mono here for better distance controlling
infont = "droid/DroidSansMono.ttf",
-- font for info messages
infofont = "noto/NotoSans-Regular.ttf",
},
sizemap = {
cfont = 24,
tfont = 26,
ffont = 20,
pgfont = 20,
scfont = 20,
rifont = 16,
hpkfont = 20,
hfont = 24,
infont = 22,
infofont = 24,
},
fallbacks = {
[1] = "noto/NotoSansCJK-Regular.ttf",
[2] = "noto/NotoSans-Regular.ttf",
[3] = "freefont/FreeSans.ttf",
},
fontdir = "./fonts",
-- face table
faces = {},
}
function Font:getFace(font, size)
-- default to content font
if not font then font = self.cfont end
if not size then size = self.sizemap[font] end
-- original size before scaling by screen DPI
local orig_size = size
size = Screen:scaleBySize(size)
local hash = font..size
local face_obj = self.faces[hash]
-- build face if not found
if not face_obj then
local realname = self.fontmap[font]
if not realname then
realname = font
end
realname = self.fontdir.."/"..realname
local ok, face = pcall(Freetype.newFace, realname, size)
if not ok then
logger.warn("#! Font ", font, " (", realname, ") not supported: ", face)
return nil
end
--- Freetype font face wrapper object
-- @table FontFaceObj
-- @field size size of the font face (after scaled by screen size)
-- @field orig_size raw size of the font face (before scale)
-- @field ftface font face object from freetype
-- @field hash hash key for this font face
face_obj = {
size = size,
orig_size = orig_size,
ftface = face,
hash = hash
}
self.faces[hash] = face_obj
end
return face_obj
end
--[[
These fonts from Kindle system cannot be loaded by Freetype.
--]]
local kindle_fonts_blacklist = {
["HYGothicBold.ttf"] = true,
["HYGothicMedium.ttf"] = true,
["HYMyeongJoBold.ttf"] = true,
["HYMyeongJoMedium.ttf"] = true,
["MYingHeiTBold.ttf"] = true,
["MYingHeiTMedium.ttf"] = true,
["SongTBold.ttf"] = true,
["SongTMedium.ttf"] = true,
}
local function isInFontsBlacklist(f)
if Device:isKindle() then
return kindle_fonts_blacklist[f]
end
end
function Font:_readList(target, dir)
-- lfs.dir non-exsitent directory will give error, weird!
local ok, iter, dir_obj = pcall(lfs.dir, dir)
if not ok then return end
for f in iter, dir_obj do
if lfs.attributes(dir.."/"..f, "mode") == "directory" and f ~= "." and f ~= ".." then
self:_readList(target, dir.."/"..f)
else
local file_type = string.lower(string.match(f, ".+%.([^.]+)") or "")
if file_type == "ttf" or file_type == "ttc"
or file_type == "cff" or file_type == "otf" then
if not isInFontsBlacklist(f) then
table.insert(target, dir.."/"..f)
end
end
end
end
end
function Font:_getExternalFontDir()
if Device:isAndroid() then
return ANDROID_FONT_DIR
else
return os.getenv("EXT_FONT_DIR")
end
end
function Font:getFontList()
local fontlist = {}
self:_readList(fontlist, self.fontdir)
-- multiple paths should be joined with semicolon
for dir in string.gmatch(self:_getExternalFontDir() or "", "([^;]+)") do
self:_readList(fontlist, dir)
end
table.sort(fontlist)
return fontlist
end
return Font