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077517be0b
to support custom font directory for EPUB documents Now Koreader could find fonts in the "fonts" directory in the USB root directory of kindle, Kobo and PocketBook devices, thus no need to copy fonts to "koreader/fonts" directory.
114 lines
3.3 KiB
Lua
114 lines
3.3 KiB
Lua
local lfs = require("libs/libkoreader-lfs")
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local Freetype = require("ffi/freetype")
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local Screen = require("device").screen
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local DEBUG = require("dbg")
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local Font = {
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fontmap = {
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-- default font for menu contents
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cfont = "noto/NotoSans-Regular.ttf",
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-- default font for title
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--tfont = "NimbusSanL-BoldItal.cff",
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tfont = "noto/NotoSans-Bold.ttf",
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-- default font for footer
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ffont = "noto/NotoSans-Regular.ttf",
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-- default font for reading position info
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rifont = "noto/NotoSans-Regular.ttf",
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-- default font for pagination display
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pgfont = "noto/NotoSans-Regular.ttf",
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-- selectmenu: font for item shortcut
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scfont = "droid/DroidSansMono.ttf",
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-- help page: font for displaying keys
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hpkfont = "droid/DroidSansMono.ttf",
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-- font for displaying help messages
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hfont = "noto/NotoSans-Regular.ttf",
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-- font for displaying input content
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-- we have to use mono here for better distance controlling
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infont = "droid/DroidSansMono.ttf",
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-- font for info messages
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infofont = "noto/NotoSans-Regular.ttf",
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},
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fallbacks = {
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[1] = "droid/DroidSansFallback.ttc",
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[2] = "noto/NotoSans-Regular.ttf",
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[3] = "droid/DroidSans.ttf",
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[4] = "freefont/FreeSans.ttf",
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},
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fontdir = "./fonts",
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-- face table
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faces = {},
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}
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function Font:getFace(font, size)
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if not font then
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-- default to content font
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font = self.cfont
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end
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-- original size before scaling by screen DPI
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local orig_size = size
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local size = Screen:scaleBySize(size)
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local face = self.faces[font..size]
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-- build face if not found
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if not face then
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local realname = self.fontmap[font]
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if not realname then
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realname = font
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end
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realname = self.fontdir.."/"..realname
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ok, face = pcall(Freetype.newFace, realname, size)
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if not ok then
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DEBUG("#! Font "..font.." ("..realname..") not supported: "..face)
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return nil
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end
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self.faces[font..size] = face
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--DEBUG("getFace, found: "..realname.." size:"..size)
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end
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return { size = size, orig_size = orig_size, ftface = face, hash = font..size }
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end
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function Font:_readList(target, dir)
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for f in lfs.dir(dir) do
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if lfs.attributes(dir.."/"..f, "mode") == "directory" and f ~= "." and f ~= ".." then
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self:_readList(target, dir.."/"..f)
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else
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local file_type = string.lower(string.match(f, ".+%.([^.]+)") or "")
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if file_type == "ttf" or file_type == "ttc"
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or file_type == "cff" or file_type == "otf" then
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table.insert(target, dir.."/"..f)
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end
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end
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end
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end
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function Font:getFontList()
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local fontlist = {}
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self:_readList(fontlist, self.fontdir)
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-- multiple path should be joined with semicolon in FONTDIR env variable
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for dir in string.gmatch(os.getenv("FONTDIR") or "", "([^;]+)") do
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self:_readList(fontlist, dir)
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end
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table.sort(fontlist)
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return fontlist
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end
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function Font:update()
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for _k, _v in ipairs(self.faces) do
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_v:done()
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end
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self.faces = {}
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clearGlyphCache()
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end
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return Font
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