/
libtexpdf.lua
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libtexpdf.lua
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local base = require("outputters.base")
local pdf = require("justenoughlibtexpdf")
local cursorX = 0
local cursorY = 0
local started = false
local lastkey = false
local debugfont = SILE.font.loadDefaults({ family = "Gentium Plus", language = "en", size = 10 })
local glyph2string = function (glyph)
return string.char(math.floor(glyph % 2^32 / 2^8)) .. string.char(glyph % 0x100)
end
local _dl = 0.5
local _debugfont
local _font
local outputter = pl.class(base)
outputter._name = "libtexpdf"
outputter.extension = "pdf"
-- The outputter init can't actually initialize output (as logical as it might
-- have seemed) because that requires a page size which we don't know yet.
-- function outputter:_init () end
function outputter:_ensureInit ()
if not started then
local w, h = SILE.documentState.paperSize[1], SILE.documentState.paperSize[2]
local fname = self:getOutputFilename()
pdf.init(fname == "-" and "/dev/stdout" or fname, w, h, SILE.full_version)
pdf.beginpage()
started = true
end
end
function outputter:newPage ()
self:_ensureInit()
pdf.endpage()
pdf.beginpage()
end
-- pdf structure package needs a tie in here
function outputter._endHook (_)
end
function outputter:finish ()
self:_ensureInit()
pdf.endpage()
self:_endHook()
pdf.finish()
started = false
lastkey = nil
end
function outputter.getCursor (_)
return cursorX, cursorY
end
function outputter.setCursor (_, x, y, relative)
x = SU.cast("number", x)
y = SU.cast("number", y)
local offset = relative and { x = cursorX, y = cursorY } or { x = 0, y = 0 }
cursorX = offset.x + x
cursorY = offset.y + (relative and 0 or SILE.documentState.paperSize[2]) - y
end
function outputter:setColor (color)
self:_ensureInit()
if color.r then pdf.setcolor_rgb(color.r, color.g, color.b) end
if color.c then pdf.setcolor_cmyk(color.c, color.m, color.y, color.k) end
if color.l then pdf.setcolor_gray(color.l) end
end
function outputter:pushColor (color)
self:_ensureInit()
if color.r then pdf.colorpush_rgb(color.r, color.g, color.b) end
if color.c then pdf.colorpush_cmyk(color.c, color.m, color.y, color.k) end
if color.l then pdf.colorpush_gray(color.l) end
end
function outputter:popColor ()
self:_ensureInit()
pdf.colorpop()
end
function outputter:_drawString (str, width, x_offset, y_offset)
local x, y = self:getCursor()
pdf.colorpush_rgb(0,0,0)
pdf.colorpop()
pdf.setstring(x+x_offset, y+y_offset, str, string.len(str), _font, width)
end
function outputter:drawHbox (value, width)
width = SU.cast("number", width)
self:_ensureInit()
if not value.glyphString then return end
-- Nodes which require kerning or have offsets to the glyph
-- position should be output a glyph at a time. We pass the
-- glyph advance from the htmx table, so that libtexpdf knows
-- how wide each glyph is. It uses this to then compute the
-- relative position between the pen after the glyph has been
-- painted (cursorX + glyphAdvance) and the next painting
-- position (cursorX + width - remember that the box's "width"
-- is actually the shaped x_advance).
if value.complex then
for i = 1, #value.items do
local item = value.items[i]
local buf = glyph2string(item.gid)
self:_drawString(buf, item.glyphAdvance, item.x_offset or 0, item.y_offset or 0)
self:setCursor(item.width, 0, true)
end
else
local buf = {}
for i = 1, #value.glyphString do
buf[i] = glyph2string(value.glyphString[i])
end
buf = table.concat(buf, "")
self:_drawString(buf, width, 0, 0)
end
end
function outputter:_withDebugFont (callback)
if not _debugfont then
_debugfont = self:setFont(debugfont)
end
local oldfont = _font
_font = _debugfont
callback()
_font = oldfont
end
function outputter:setFont (options)
self:_ensureInit()
local key = SILE.font._key(options)
if lastkey and key == lastkey then return _font end
local font = SILE.font.cache(options, SILE.shaper.getFace)
if options.direction == "TTB" then
font.layout_dir = 1
end
if SILE.typesetter.frame and SILE.typesetter.frame:writingDirection() == "TTB" then
pdf.setdirmode(1)
else
pdf.setdirmode(0)
end
_font = pdf.loadfont(font)
if _font < 0 then SU.error("Font loading error for " .. pl.pretty.write(options, "")) end
lastkey = key
return _font
end
function outputter:drawImage (src, x, y, width, height, pageno)
x = SU.cast("number", x)
y = SU.cast("number", y)
width = SU.cast("number", width)
height = SU.cast("number", height)
self:_ensureInit()
pdf.drawimage(src, x, y, width, height, pageno or 1)
end
function outputter:getImageSize (src, pageno)
self:_ensureInit() -- in case it's a PDF file
local llx, lly, urx, ury, xresol, yresol = pdf.imagebbox(src, pageno or 1)
return (urx-llx), (ury-lly), xresol, yresol
end
function outputter:drawSVG (figure, x, y, _, height, scalefactor)
self:_ensureInit()
x = SU.cast("number", x)
y = SU.cast("number", y)
height = SU.cast("number", height)
pdf.add_content("q")
self:setCursor(x, y)
x, y = self:getCursor()
local newy = y - SILE.documentState.paperSize[2] + height
pdf.add_content(table.concat({ scalefactor, 0, 0, -scalefactor, x, newy, "cm" }, " "))
pdf.add_content(figure)
pdf.add_content("Q")
end
function outputter:drawRule (x, y, width, height)
x = SU.cast("number", x)
y = SU.cast("number", y)
width = SU.cast("number", width)
height = SU.cast("number", height)
self:_ensureInit()
local paperY = SILE.documentState.paperSize[2]
pdf.setrule(x, paperY - y - height, width, height)
end
function outputter:debugFrame (frame)
self:_ensureInit()
self:pushColor({ r = 0.8, g = 0, b = 0 })
self:drawRule(frame:left()-_dl/2, frame:top()-_dl/2, frame:width()+_dl, _dl)
self:drawRule(frame:left()-_dl/2, frame:top()-_dl/2, _dl, frame:height()+_dl)
self:drawRule(frame:right()-_dl/2, frame:top()-_dl/2, _dl, frame:height()+_dl)
self:drawRule(frame:left()-_dl/2, frame:bottom()-_dl/2, frame:width()+_dl, _dl)
-- self:drawRule(frame:left() + frame:width()/2 - 5, (frame:top() + frame:bottom())/2+5, 10, 10)
local stuff = SILE.shaper:createNnodes(frame.id, debugfont)
stuff = stuff[1].nodes[1].value.glyphString -- Horrible hack
local buf = {}
for i = 1, #stuff do
buf[i] = glyph2string(stuff[i])
end
buf = table.concat(buf, "")
self:_withDebugFont(function ()
self:setCursor(frame:left():tonumber() - _dl/2, frame:top():tonumber() + _dl/2)
self:_drawString(buf, 0, 0, 0)
end)
self:popColor()
end
function outputter:debugHbox (hbox, scaledWidth)
self:_ensureInit()
self:pushColor({ r = 0.8, g = 0.3, b = 0.3 })
local paperY = SILE.documentState.paperSize[2]
local x, y = self:getCursor()
y = paperY - y
self:drawRule(x-_dl/2, y-_dl/2-hbox.height, scaledWidth+_dl, _dl)
self:drawRule(x-_dl/2, y-hbox.height-_dl/2, _dl, hbox.height+hbox.depth+_dl)
self:drawRule(x-_dl/2, y-_dl/2, scaledWidth+_dl, _dl)
self:drawRule(x+scaledWidth-_dl/2, y-hbox.height-_dl/2, _dl, hbox.height+hbox.depth+_dl)
if hbox.depth > SILE.length(0) then
self:drawRule(x-_dl/2, y+hbox.depth-_dl/2, scaledWidth+_dl, _dl)
end
self:popColor()
end
return outputter