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|
if not modules then modules = { } end modules ['mlib-svg'] = {
version = 1.001,
comment = "companion to mlib-ctx.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files",
}
-- As usual with these standards, things like a path can be very compact while the rest is
-- very verbose which defeats the point. This is a first attempt. There will be a converter
-- to MP as well as directly to PDF. This module was made for one of the dangerous curves
-- talks at the 2019 CTX meeting. I will do the font when I need it (not that hard).
--
-- There is no real need to boost performance here .. we can always make a fast variant
-- when really needed. I will also do some of the todo's when I run into proper fonts.
-- Written with Anne Clark on speakers as distraction.
-- Todo when I run into an example:
--
-- var(color,color)
-- --color<decimal>
-- currentColor : when i run into an example
-- some more fonts
--
-- Todo: some day
--
-- optimize
-- instances
-- withpen -> pickup
--
-- Todo: when i am motivated
--
-- shading
-- "none" -> false
-- clip = [ auto | rect(llx,lly,urx,ury) ] (in svg)
-- xlink url ... whatever
-- The fact that in the more recent versions of SVG the older text related elements
-- are depricated and not even supposed to be supported, combined with the fact that
-- the text element assumes css styling, demonstrates that there is not so much as a
-- standard. It basically means that whatever technology dominates at some point
-- (probably combined with some libraries that at that point exist) determine what
-- is standard. Anyway, it probably also means that these formats are not that
-- suitable for long term archival purposes. So don't take the next implementation
-- too serious.
-- We can do a direct conversion to PDF but then we also loose the abstraction which
-- in the future will be used.
local type, tonumber = type, tonumber
local P, S, R, C, Ct, Cs, Cc, Cp, Carg = lpeg.P, lpeg.S, lpeg.R, lpeg.C, lpeg.Ct, lpeg.Cs, lpeg.Cc, lpeg.Cp, lpeg.Carg
local lpegmatch, lpegpatterns = lpeg.match, lpeg.patterns
local pi, sin, cos, asin, sind, cosd, tan, abs, sqrt = math.pi, math.sin, math.cos, math.asin, math.sind, math.cosd, math.tan, math.abs, math.sqrt
local concat, setmetatableindex = table.concat, table.setmetatableindex
local gmatch, gsub, find, match, rep = string.gmatch, string.gsub, string.find, string.match, string.rep
local formatters = string.formatters
local extract = bit32.extract
local xmlconvert, xmlcollected, xmlcount, xmlfirst, xmlroot, xmltext = xml.convert, xml.collected, xml.count, xml.first, xml.root, xml.text
metapost = metapost or { }
local metapost = metapost
local context = context
local report = logs.reporter("metapost","svg")
local trace = false
-- local trace = true
-- todo: also a high res mode
-- todo: optimize (no hurry)
local f_rectangle = formatters['unitsquare xyscaled (%.3N,%.3N) shifted (%.3N,%.3N)']
local f_rounded = formatters['roundedsquarexy(%.3N,%.3N,%.3N,%.3N) shifted (%.3N,%.3N)']
local f_ellipse = formatters['(fullcircle xyscaled (%.3N,%.3N) shifted (%.3N,%.3N))']
local f_circle = formatters['(fullcircle scaled %.3N shifted (%.3N,%.3N))']
local f_line = formatters['((%.3N,%.3N)--(%.3N,%.3N))']
local f_fill = formatters['fill %s(%s--cycle)%s%s%s ;'] -- play safe
local f_fill_cycle_c = formatters['fill %s(%s..cycle)%s%s%s ;']
local f_fill_cycle_l = formatters['fill %s(%s--cycle)%s%s%s ;']
local f_eofill = formatters['eofill %s(%s--cycle)%s%s%s ;'] -- play safe
local f_eofill_cycle_c = formatters['eofill %s(%s..cycle)%s%s%s ;']
local f_eofill_cycle_l = formatters['eofill %s(%s--cycle)%s%s%s ;']
local f_nofill = formatters['nofill %s(%s--cycle)%s ;'] -- play safe
local f_nofill_cycle_c = formatters['nofill %s(%s..cycle)%s ;']
local f_nofill_cycle_l = formatters['nofill %s(%s--cycle)%s ;']
local f_draw = formatters['draw %s(%s)%s%s%s%s%s ;']
local f_nodraw = formatters['nodraw %s(%s)%s ;']
-- local f_fill = formatters['F %s(%s--C)%s%s%s ;'] -- play safe
-- local f_fill_cycle_c = formatters['F %s(%s..C)%s%s%s ;']
-- local f_fill_cycle_l = formatters['F %s(%s--C)%s%s%s ;']
-- local f_eofill = formatters['E %s(%s--C)%s%s%s ;'] -- play safe
-- local f_eofill_cycle_c = formatters['E %s(%s..C)%s%s%s ;']
-- local f_eofill_cycle_l = formatters['E %s(%s--C)%s%s%s ;']
-- local f_nofill = formatters['f %s(%s--C)%s ;'] -- play safe
-- local f_nofill_cycle_c = formatters['f %s(%s..C)%s ;']
-- local f_nofill_cycle_l = formatters['f %s(%s--C)%s ;']
-- local f_draw = formatters['D %s(%s)%s%s%s%s%s ;']
-- local f_nodraw = formatters['d %s(%s)%s ;']
local f_color = formatters[' withcolor "%s"']
----- f_color_rgb = formatters[' withcolor "0x%02X%02X%02X"']
----- f_color_rgba = formatters[' withcolor "0x%02X%02X%02X" withtransparency (1,%3N)']
----- f_color_triplet = formatters['"0x%02X%02X%02X"']
local f_rgb = formatters[' withcolor svgcolor(%.3N,%.3N,%.3N)']
local f_rgba = formatters[' withcolor svgcolor(%.3N,%.3N,%.3N) withtransparency (1,%3N)']
local f_triplet = formatters['svgvolor(%.3N,%.3N,%.3N)']
local f_gray = formatters[' withcolor %.3N']
local f_opacity = formatters[' withtransparency (1,%.3N)']
local f_pen = formatters[' withpen pencircle scaled %.3N']
local f_dashed_n = formatters[" dashed dashpattern (%s ) "]
local f_dashed_y = formatters[" dashed dashpattern (%s ) shifted (%.3N,0) "]
local f_moveto = formatters['(%N,%n)']
local f_curveto_z = formatters[' controls (%.3N,%.3N) and (%.3N,%.3N) .. (%.3N,%.3N)']
local f_curveto_n = formatters['.. controls (%.3N,%.3N) and (%.3N,%.3N) .. (%.3N,%.3N)']
local f_lineto_z = formatters['(%.3N,%.3N)']
local f_lineto_n = formatters['-- (%.3N,%.3N)']
local f_rotatedaround = formatters[" ) rotatedaround((%.3N,%.3N),%.3N)"]
local f_rotated = formatters[" ) rotated(%.3N)"]
local f_shifted = formatters[" ) shifted(%.3N,%.3N)"]
local f_slanted_x = formatters[" ) xslanted(%.3N)"]
local f_slanted_y = formatters[" ) yslanted(%.3N)"]
local f_scaled = formatters[" ) scaled(%.3N)"]
local f_xyscaled = formatters[" ) xyscaled(%.3N,%.3N)"]
local f_matrix = formatters[" ) transformed bymatrix(%.3N,%.3N,%.3N,%.3N,%.3N,%.3N)"]
-- penciled n -> withpen pencircle scaled n
-- applied (...) -> transformed bymatrix (...)
-- withopacity n -> withtransparency (1,n)
local s_clip_start = 'draw image ('
local f_clip_stop = formatters[') ; clip currentpicture to (%s) ;']
local f_eoclip_stop = formatters[') ; eoclip currentpicture to (%s) ;']
local f_transform_start = formatters["draw %s image ( "]
local f_transform_stop = formatters[") %s ;"]
local s_offset_start = "draw image ( "
local f_offset_stop = formatters[") shifted (%.3N,%.3N) ;"]
local s_scaled_start = "draw image ( "
local f_scaled_stop = formatters[") scaled %.3N ;"]
local s_hacked_start = "draw image ("
local f_hacked_stop = formatters[") shifted (0,%.3N) scaled %.3N ;"]
-- local f_hacked_stop = formatters[") scaled %.3N ;"]
local f_viewport_start = "draw image ("
local f_viewport_stop = ") ;"
local f_viewport_shift = formatters["currentpicture := currentpicture shifted (%03N,%03N);"]
local f_viewport_clip = formatters["clip currentpicture to (unitsquare xyscaled (%03N,%03N));"]
local f_linecap = formatters["interim linecap := %s ;"]
local f_linejoin = formatters["interim linejoin := %s ;"]
local f_miterlimit = formatters["interim miterlimit := %s ;"]
local s_begingroup = "begingroup;"
local s_endgroup = "endgroup;"
-- make dedicated macro
local s_shade_linear = ' withshademethod "linear" '
local s_shade_circular = ' withshademethod "circular" '
local f_shade_step = formatters['withshadestep ( withshadefraction %.3N withshadecolors(%s,%s) )']
local f_shade_one = formatters['withprescript "sh_center_a=%.3N %.3N"']
local f_shade_two = formatters['withprescript "sh_center_b=%.3N %.3N"']
local f_text_scaled = formatters['(textext.drt("%s") scaled %.3N shifted (%.3N,%.3N))']
local f_text_normal = formatters['(textext.drt("%s") shifted (%.3N,%.3N))']
-- We can actually use the svg color definitions from the tex end but maybe a user doesn't
-- want those replace the normal definitions.
local svgcolors = {
black = 0x000000,
navy = 0x000080,
darkblue = 0x00008B,
mediumblue = 0x0000CD,
blue = 0x0000FF,
darkgreen = 0x006400,
green = 0x008000,
teal = 0x008080,
darkcyan = 0x008B8B,
deepskyblue = 0x00BFFF,
darkturquoise = 0x00CED1,
mediumspringgreen = 0x00FA9A,
lime = 0x00FF00,
springgreen = 0x00FF7F,
cyan = 0x00FFFF,
aqua = 0x00FFFF,
midnightblue = 0x191970,
dodgerblue = 0x1E90FF,
lightseagreen = 0x20B2AA,
forestgreen = 0x228B22,
seagreen = 0x2E8B57,
darkslategray = 0x2F4F4F,
darkslategrey = 0x2F4F4F,
limegreen = 0x32CD32,
mediumseagreen = 0x3CB371,
turquoise = 0x40E0D0,
royalblue = 0x4169E1,
steelblue = 0x4682B4,
darkslateblue = 0x483D8B,
mediumturquoise = 0x48D1CC,
indigo = 0x4B0082,
darkolivegreen = 0x556B2F,
cadetblue = 0x5F9EA0,
cornflowerblue = 0x6495ED,
mediumaquamarine = 0x66CDAA,
dimgrey = 0x696969,
dimgray = 0x696969,
slateblue = 0x6A5ACD,
olivedrab = 0x6B8E23,
slategrey = 0x708090,
slategray = 0x708090,
lightslategray = 0x778899,
lightslategrey = 0x778899,
mediumslateblue = 0x7B68EE,
lawngreen = 0x7CFC00,
chartreuse = 0x7FFF00,
aquamarine = 0x7FFFD4,
maroon = 0x800000,
purple = 0x800080,
olive = 0x808000,
gray = 0x808080,
grey = 0x808080,
skyblue = 0x87CEEB,
lightskyblue = 0x87CEFA,
blueviolet = 0x8A2BE2,
darkred = 0x8B0000,
darkmagenta = 0x8B008B,
saddlebrown = 0x8B4513,
darkseagreen = 0x8FBC8F,
lightgreen = 0x90EE90,
mediumpurple = 0x9370DB,
darkviolet = 0x9400D3,
palegreen = 0x98FB98,
darkorchid = 0x9932CC,
yellowgreen = 0x9ACD32,
sienna = 0xA0522D,
brown = 0xA52A2A,
darkgray = 0xA9A9A9,
darkgrey = 0xA9A9A9,
lightblue = 0xADD8E6,
greenyellow = 0xADFF2F,
paleturquoise = 0xAFEEEE,
lightsteelblue = 0xB0C4DE,
powderblue = 0xB0E0E6,
firebrick = 0xB22222,
darkgoldenrod = 0xB8860B,
mediumorchid = 0xBA55D3,
rosybrown = 0xBC8F8F,
darkkhaki = 0xBDB76B,
silver = 0xC0C0C0,
mediumvioletred = 0xC71585,
indianred = 0xCD5C5C,
peru = 0xCD853F,
chocolate = 0xD2691E,
tan = 0xD2B48C,
lightgray = 0xD3D3D3,
lightgrey = 0xD3D3D3,
thistle = 0xD8BFD8,
orchid = 0xDA70D6,
goldenrod = 0xDAA520,
palevioletred = 0xDB7093,
crimson = 0xDC143C,
gainsboro = 0xDCDCDC,
plum = 0xDDA0DD,
burlywood = 0xDEB887,
lightcyan = 0xE0FFFF,
lavender = 0xE6E6FA,
darksalmon = 0xE9967A,
violet = 0xEE82EE,
palegoldenrod = 0xEEE8AA,
lightcoral = 0xF08080,
khaki = 0xF0E68C,
aliceblue = 0xF0F8FF,
honeydew = 0xF0FFF0,
azure = 0xF0FFFF,
sandybrown = 0xF4A460,
wheat = 0xF5DEB3,
beige = 0xF5F5DC,
whitesmoke = 0xF5F5F5,
mintcream = 0xF5FFFA,
ghostwhite = 0xF8F8FF,
salmon = 0xFA8072,
antiquewhite = 0xFAEBD7,
linen = 0xFAF0E6,
lightgoldenrodyellow = 0xFAFAD2,
oldlace = 0xFDF5E6,
red = 0xFF0000,
fuchsia = 0xFF00FF,
magenta = 0xFF00FF,
deeppink = 0xFF1493,
orangered = 0xFF4500,
tomato = 0xFF6347,
hotpink = 0xFF69B4,
coral = 0xFF7F50,
darkorange = 0xFF8C00,
lightsalmon = 0xFFA07A,
orange = 0xFFA500,
lightpink = 0xFFB6C1,
pink = 0xFFC0CB,
gold = 0xFFD700,
peachpuff = 0xFFDAB9,
navajowhite = 0xFFDEAD,
moccasin = 0xFFE4B5,
bisque = 0xFFE4C4,
mistyrose = 0xFFE4E1,
blanchedalmond = 0xFFEBCD,
papayawhip = 0xFFEFD5,
lavenderblush = 0xFFF0F5,
seashell = 0xFFF5EE,
cornsilk = 0xFFF8DC,
lemonchiffon = 0xFFFACD,
floralwhite = 0xFFFAF0,
snow = 0xFFFAFA,
yellow = 0xFFFF00,
lightyellow = 0xFFFFE0,
ivory = 0xFFFFF0,
white = 0xFFFFFF,
}
local svgcolor = setmetatableindex(function(t,k)
-- we delay building all these strings
local v = svgcolors[k]
if v then
v = f_rgb(extract(v,16,8),extract(v,8,8),extract(v,0,8))
else
v = false
end
t[k] = v
return v
end)
local p_digit = lpegpatterns.digit
local p_hexdigit = lpegpatterns.hexdigit
local p_space = lpegpatterns.whitespace
local p_hexcolor = P("#") * C(p_hexdigit*p_hexdigit)^1 / function(r,g,b)
r = tonumber(r,16)/255
if g then
g = tonumber(g,16)/255
end
if b then
b = tonumber(b,16)/255
end
if b then
return f_rgb(r,g,b)
else
return f_gray(r)
end
end
local p_hexcolor3 = P("#") * C(p_hexdigit*p_hexdigit)^1 / function(r,g,b)
r = tonumber(r,16)/255
g = g and tonumber(g,16)/255 or r
b = b and tonumber(b,16)/255 or g
return f_triplet(r,g,b)
end
local function hexcolor(c)
return lpegmatch(p_hexcolor,c)
end
local function hexcolor3(c)
return lpegmatch(p_hexcolor3,c)
end
-- gains a little:
-- local hexhash = setmetatableindex(function(t,k) local v = lpegmatch(p_hexcolor, k) t[k] = v return v end) -- per file
-- local hexhash3 = setmetatableindex(function(t,k) local v = lpegmatch(p_hexcolor3,k) t[k] = v return v end) -- per file
--
-- local function hexcolor (c) return hexhash [c] end -- directly do hexhash [c]
-- local function hexcolor3(c) return hexhash3[c] end -- directly do hexhash3[c]
-- Most of the conversion is rather trivial code till I ran into a file with arcs. A bit
-- of searching lead to the a2c javascript function but it has some puzzling thingies
-- (like sin and cos definitions that look like leftovers). Anyway, we can if needed
-- optimize it a bit more. Here does it come from:
-- http://www.w3.org/TR/SVG11/implnote.html#ArcImplementationNotes
-- https://github.com/adobe-webplatform/Snap.svg/blob/b242f49e6798ac297a3dad0dfb03c0893e394464/src/path.js
local d120 = (pi * 120) / 180
local pi2 = 2 * pi
local function a2c(x1, y1, rx, ry, angle, large, sweep, x2, y2, f1, f2, cx, cy)
local recursive = f1
if rx == 0 or ry == 0 then
return { x1, y1, x2, y2, x2, y2 }
end
if x1 == x2 and y1 == y2 then
return { x1, y1, x2, y2, x2, y2 }
end
local rad = pi / 180 * angle
local res = nil
local cosrad = cos(-rad) -- local cosrad = cosd(angle)
local sinrad = sin(-rad) -- local sinrad = sind(angle)
if not recursive then
x1, y1 = x1 * cosrad - y1 * sinrad, x1 * sinrad + y1 * cosrad
x2, y2 = x2 * cosrad - y2 * sinrad, x2 * sinrad + y2 * cosrad
local x = (x1 - x2) / 2
local y = (y1 - y2) / 2
local xx = x * x
local yy = y * y
local h = xx / (rx * rx) + yy / (ry * ry)
if h > 1 then
h = sqrt(h)
rx = h * rx
ry = h * ry
end
local rx2 = rx * rx
local ry2 = ry * ry
local ry2xx = ry2 * xx
local rx2yy = rx2 * yy
local total = rx2yy + ry2xx -- otherwise overflow
local k = total == 0 and 0 or sqrt(abs((rx2 * ry2 - rx2yy - ry2xx) / total))
if large == sweep then
k = -k
end
cx = k * rx * y / ry + (x1 + x2) / 2
cy = k * -ry * x / rx + (y1 + y2) / 2
f1 = (y1 - cy) / ry -- otherwise crash on a tiny eps
f2 = (y2 - cy) / ry -- otherwise crash on a tiny eps
f1 = asin((f1 < -1.0 and -1.0) or (f1 > 1.0 and 1.0) or f1)
f2 = asin((f2 < -1.0 and -1.0) or (f2 > 1.0 and 1.0) or f2)
if x1 < cx then f1 = pi - f1 end
if x2 < cx then f2 = pi - f2 end
if f1 < 0 then f1 = pi2 + f1 end
if f2 < 0 then f2 = pi2 + f2 end
if sweep ~= 0 and f1 > f2 then
f1 = f1 - pi2
end
if sweep == 0 and f2 > f1 then
f2 = f2 - pi2
end
end
if abs(f2 - f1) > d120 then
local f2old = f2
local x2old = x2
local y2old = y2
f2 = f1 + d120 * ((sweep ~= 0 and f2 > f1) and 1 or -1)
x2 = cx + rx * cos(f2)
y2 = cy + ry * sin(f2)
res = a2c(x2, y2, rx, ry, angle, 0, sweep, x2old, y2old, f2, f2old, cx, cy)
end
local c1 = cos(f1)
local s1 = sin(f1)
local c2 = cos(f2)
local s2 = sin(f2)
local t = tan((f2 - f1) / 4)
local hx = 4 * rx * t / 3
local hy = 4 * ry * t / 3
local r = { x1 - hx * s1, y1 + hy * c1, x2 + hx * s2, y2 - hy * c2, x2, y2, unpack(res or { }) }
if not recursive then -- we can also check for sin/cos being 0/1
cosrad = cos(rad)
sinrad = sin(rad)
-- cosrad = cosd(angle)
-- sinrad = sind(angle)
for i0=1,#r,2 do
local i1 = i0 + 1
local x = r[i0]
local y = r[i1]
r[i0] = x * cosrad - y * sinrad
r[i1] = x * sinrad + y * cosrad
end
end
return r
end
-- incredible: we can find .123.456 => 0.123 0.456 ...
local factors = {
["pt"] = 1.25,
["mm"] = 3.543307,
["cm"] = 35.43307,
["px"] = 1,
["pc"] = 15,
["in"] = 90,
["em"] = 12 * 1.25,
["ex"] = 8 * 1.25,
}
local percentage_r = 1/100
local percentage_x = percentage_r
local percentage_y = percentage_r
local p_command_x = C(S("Hh"))
local p_command_y = C(S("Vv"))
local p_command_xy = C(S("CcLlMmQqSsTt"))
local p_command_a = C(S("Aa"))
local p_command = C(S("Zz"))
local p_separator = S("\t\n\r ,")^1
local p_number = (S("+-")^0 * (p_digit^0 * P(".") * p_digit^1 + p_digit^1 * P(".") + p_digit^1) )
local function convert (n) n = tonumber(n) return n end
local function convert_r (n,u) n = tonumber(n) if u == true then return percentage_r * n elseif u then return u * n else return n end end
local function convert_x (n,u) n = tonumber(n) if u == true then return percentage_x * n elseif u then return u * n else return n end end
local function convert_y (n,u) n = tonumber(n) if u == true then return percentage_y * n elseif u then return u * n else return n end end
local function convert_vx(n,u) n = tonumber(n) if u == true then return percentage_x * n elseif u then return u * n else return n end end
local function convert_vy(n,u) n = - tonumber(n) if u == true then return percentage_y * n elseif u then return u * n else return n end end
local p_unit = ( P("p") * S("txc") + P("e") * S("xm") + S("mc") * P("m") + P("in")) / factors
local p_percent = P("%") * Cc(true)
local c_number_n = C(p_number)
local c_number_u = C(p_number) * (p_unit + p_percent)^-1
local p_number_n = c_number_n / convert
local p_number_x = c_number_u / convert_x
local p_number_vx = c_number_u / convert_vx
local p_number_y = c_number_u / convert_y
local p_number_vy = c_number_u / convert_vy
local p_number_r = c_number_u / convert_r
-- local p_number = p_number_r -- maybe no percent here
local function asnumber (s) return lpegmatch(p_number, s) end
local function asnumber_r (s) return lpegmatch(p_number_r, s) end
local function asnumber_x (s) return lpegmatch(p_number_x, s) end
local function asnumber_y (s) return lpegmatch(p_number_y, s) end
local function asnumber_vx(s) return lpegmatch(p_number_vx,s) end
local function asnumber_vy(s) return lpegmatch(p_number_vy,s) end
local p_numbersep = p_number_n + p_separator
local p_numbers = p_separator^0 * P("(") * p_numbersep^0 * p_separator^0 * P(")")
local p_four = p_numbersep^4
-- local p_path = Ct((p_command + (p_number_x * p_separator^0 * p_number_y * p_separator^0) + p_separator)^1)
local p_path = Ct ( (
p_command_xy * (p_separator^0 * p_number_vx *
p_separator^0 * p_number_vy )^1
+ p_command_x * (p_separator^0 * p_number_vx )^1
+ p_command_y * (p_separator^0 * p_number_vy )^1
+ p_command_a * (p_separator^0 * p_number_vx *
p_separator^0 * p_number_vy *
p_separator^0 * p_number_r *
p_separator^0 * p_number_n * -- flags
p_separator^0 * p_number_n * -- flags
p_separator^0 * p_number_vx *
p_separator^0 * p_number_vy )^1
+ p_command
+ p_separator
)^1 )
local p_rgbacolor = P("rgba(") * (C(p_number) + p_separator)^1 * P(")")
local function rgbacolor(s)
local r, g, b, a = lpegmatch(p_rgbacolor,s)
if a then
return f_rgba(r/255,g/255,b/255,a)
end
end
local function viewbox(v)
local x, y, w, h = lpegmatch(p_four,v)
if h then
return x, y, w, h
end
end
-- actually we can loop faster because we can go to the last one
local function grabpath(str)
local p = lpegmatch(p_path,str)
local np = #p
local t = { } -- no real saving here if we share
local n = 0
local all = { entries = np, closed = false, curve = false }
local a = 0
local i = 0
local last = "M"
local prev = last
local kind = "L"
local x = 0
local y = 0
local x1 = 0
local y1 = 0
local x2 = 0
local y2 = 0
local rx = 0
local ry = 0
local ar = 0
local al = 0
local as = 0
local ac = nil
while i < np do
i = i + 1
local pi = p[i]
if type(pi) ~= "number" then
last = pi
i = i + 1
pi = p[i]
end
-- most often
::restart::
if last == "c" then
x1 = x + pi
i = i + 1 ; y1 = y + p[i]
i = i + 1 ; x2 = x + p[i]
i = i + 1 ; y2 = y + p[i]
i = i + 1 ; x = x + p[i]
i = i + 1 ; y = y + p[i]
goto curveto
elseif last == "l" then
x = x + pi
i = i + 1 ; y = y + p[i]
goto lineto
elseif last == "h" then
x = x + pi
goto lineto
elseif last == "v" then
y = y + pi
goto lineto
elseif last == "a" then
x1 = x
y1 = y
rx = pi
i = i + 1 ; ry = p[i]
i = i + 1 ; ar = p[i]
i = i + 1 ; al = p[i]
i = i + 1 ; as = p[i]
i = i + 1 ; x = x + p[i]
i = i + 1 ; y = y + p[i]
goto arc
elseif last == "s" then
if prev == "C" then
x1 = 2 * x - x2
y1 = 2 * y - y2
else
x1 = x
y1 = y
end
x2 = x + pi
i = i + 1 ; y2 = y + p[i]
i = i + 1 ; x = x + p[i]
i = i + 1 ; y = y + p[i]
goto curveto
elseif last == "m" then
if n > 0 then
a = a + 1
all[a] = concat(t,"",1,n)
n = 0
end
x = x + pi
i = i + 1 ; y = y + p[i]
goto moveto
elseif last == "z" then
goto close
-- less frequent
elseif last == "C" then
x1 = pi
i = i + 1 ; y1 = p[i]
i = i + 1 ; x2 = p[i]
i = i + 1 ; y2 = p[i]
i = i + 1 ; x = p[i]
i = i + 1 ; y = p[i]
goto curveto
elseif last == "L" then
x = pi
i = i + 1 ; y = p[i]
goto lineto
elseif last == "H" then
x = pi
goto lineto
elseif last == "V" then
y = pi
goto lineto
elseif last == "A" then
x1 = x
y1 = y
rx = pi
i = i + 1 ; ry = p[i]
i = i + 1 ; ar = p[i]
i = i + 1 ; al = p[i]
i = i + 1 ; as = p[i]
i = i + 1 ; x = p[i]
i = i + 1 ; y = p[i]
goto arc
elseif last == "S" then
if prev == "C" then
x1 = 2 * x - x2
y1 = 2 * y - y2
else
x1 = x
y1 = y
end
x2 = pi
i = i + 1 ; y2 = p[i]
i = i + 1 ; x = p[i]
i = i + 1 ; y = p[i]
goto curveto
elseif last == "M" then
if n > 0 then
a = a + 1 ; all[a] = concat(t,"",1,n) ; n = 0
end
x = pi ;
i = i + 1 ; y = p[i]
goto moveto
elseif last == "Z" then
goto close
-- very seldom
elseif last == "q" then
x1 = x + pi
i = i + 1 ; y1 = y + p[i]
i = i + 1 ; x2 = x + p[i]
i = i + 1 ; y2 = y + p[i]
goto quadratic
elseif last == "t" then
if prev == "C" then
x1 = 2 * x - x1
y1 = 2 * y - y1
else
x1 = x
y1 = y
end
x2 = x + pi
i = i + 1 ; y2 = y + p[i]
goto quadratic
elseif last == "Q" then
x1 = pi
i = i + 1 ; y1 = p[i]
i = i + 1 ; x2 = p[i]
i = i + 1 ; y2 = p[i]
goto quadratic
elseif last == "T" then
if prev == "C" then
x1 = 2 * x - x1
y1 = 2 * y - y1
else
x1 = x
y1 = y
end
x2 = pi
i = i + 1 ; y2 = p[i]
goto quadratic
else
goto continue
end
::moveto::
n = n + 1 ; t[n] = f_moveto(x,y)
last = last == "M" and "L" or "l"
prev = "M"
goto continue
::lineto::
n = n + 1 ; t[n] = (n > 0 and f_lineto_n or f_lineto_z)(x,y)
prev = "L"
goto continue
::curveto::
n = n + 1 ; t[n] = (n > 0 and f_curveto_n or f_curveto_z)(x1,y1,x2,y2,x,y)
prev = "C"
goto continue
::arc::
ac = a2c(x1,y1,rx,ry,ar,al,as,x,y)
for i=1,#ac,6 do
n = n + 1 ; t[n] = (n > 0 and f_curveto_n or f_curveto_z)(
ac[i],ac[i+1],ac[i+2],ac[i+3],ac[i+4],ac[i+5]
)
end
prev = "A"
goto continue
::quadratic::
n = n + 1 ; t[n] = (n > 0 and f_curveto_n or f_curveto_z)(
x + 2/3 * (x1-x ), y + 2/3 * (y1-y ),
x2 + 2/3 * (x1-x2), y2 + 2/3 * (y1-y2),
x2, y2
)
x = x2
y = y2
prev = "C"
goto continue
::close::
-- n = n + 1 ; t[n] = prev == "C" and "..cycle" or "--cycle"
n = n + 1 ; t[n] = "--cycle"
if n > 0 then
a = a + 1 ; all[a] = concat(t,"",1,n) ; n = 0
end
if i == n then
break
else
i = i - 1
end
kind = prev
prev = "Z"
::continue::
end
if n > 0 then
a = a + 1 ; all[a] = concat(t,"",1,n) ; n = 0
end
if prev == "Z" then
all.closed = true
end
all.curve = (kind == "C" or kind == "A")
return all
end
local transform do
--todo: better lpeg
local n = 0
local function rotate(r,x,y)
if x then
n = n + 1
return r and f_rotatedaround(x,-(y or x),-r)
elseif r then
n = n + 1
return f_rotated(-r)
else
return ""
end
end
local function translate(x,y)
if y then
n = n + 1
return f_shifted(x,-y)
elseif x then
n = n + 1
return f_shifted(x,0)
else
return ""
end
end
local function scale(x,y)
if y then
n = n + 1
return f_xyscaled(x,y)
elseif x then
n = n + 1
return f_scaled(x)
else
return ""
end
end
local function skewx(x)
if x then
n = n + 1
return f_slanted_x(math.sind(-x))
else
return ""
end
end
local function skewy(y)
if y then
n = n + 1
return f_slanted_y(math.sind(-y))
else
return ""
end
end
local function matrix(rx,sx,sy,ry,tx,ty)
n = n + 1
return f_matrix(rx or 1, sx or 0, sy or 0, ry or 1, tx or 0, - (ty or 0))
end
-- how to deal with units here?
local p_transform = Cs ( (
P("translate") * p_numbers / translate -- maybe xy
+ P("scale") * p_numbers / scale
+ P("rotate") * p_numbers / rotate
+ P("matrix") * p_numbers / matrix
+ P("skewX") * p_numbers / skewx
+ P("skewY") * p_numbers / skewy
-- + p_separator
+ P(1)/""
)^1)
transform = function(t,image)
n = 0
local e = lpegmatch(p_transform,t)
local b = rep("( ",n)
if image then
return f_transform_start(b), f_transform_stop(e)
else
return b, e
end
end
end
local dashed do
-- actually commas are mandate but we're tolerant
local p_number = p_separator^0/"" * p_number_r
local p_on = Cc(" on ") * p_number
local p_off = Cc(" off ") * p_number
local p_dashed = Cs((p_on * p_off^-1)^1)
dashed = function(s,o)
if not find(s,",") then
-- a bit of a hack:
s = s .. " " .. s
end
return (o and f_dashed_y or f_dashed_n)(lpegmatch(p_dashed,s),o)
end
end
do
local defaults = {
x = 0, x1 = 0, x2 = 0, cx = 0, rx = 0,
y = 0, y1 = 0, y2 = 0, cy = 0, ry = 0,
r = 0,
width = 0,
height = 0,
stroke = "none",
fill = "black",
opacity = "none",
["stroke-width"] = 1,
["stroke-linecap"] = "none",
["stroke-linejoin"] = "none",
["stroke-dasharray"] = "none",
["stroke-dashoffset"] = "none",
["stroke-miterlimit"] = "none",
["stroke-opacity"] = "none",
["fill-opacity"] = "none",
-- ["fill-rule"] = "nonzero",
-- ["clip-rule"] = "nonzero",
}
local handlers = { }
local process = false
local root = false
local result = false
local r = false
local definitions = false
local styles = false
local bodyfont = false
-- todo: check use ... and make definitions[id] self resolving
local function locate(id)
local ref = gsub(id,"^url%(#(.-)%)$","%1")
local ref = gsub(ref,"^#","")
local res = xmlfirst(root,"**[@id='"..ref.."']")
if res then
definitions[id] = res
return res
else
-- warning
end
end
local function clippath(id,a)
local spec = definitions[id] or locate(id)
if spec then
local kind = spec.tg
if kind == "clipPath" then
::again::
for c in xmlcollected(spec,"/(path|use|g)") do
local tg = c.tg
if tg == "use" then
local ca = c.at
local id = ca["xlink:href"]
if id then
spec = locate(id)
if spec then
local sa = spec.at
setmetatableindex(sa,ca)
if spec.tg == "path" then
local d = sa.d
if d then
local p = grabpath(d)
p.evenodd = sa["clip-rule"] == "evenodd" or a["clip-rule"] == "evenodd"
return p
else
goto done
end
else
goto again
end
end
end
-- break
elseif tg == "path" then
local ca = c.at
local d = ca.d
if d then
local p = grabpath(d)
p.evenodd = ca["clip-rule"] == "evenodd" or a["clip-rule"] == "evenodd"
return p
else
goto done
end
else
-- inherit?
end
end
::done::
else
report("unknown clip %a",id)
end
end
end
local function gradient(id)
local spec = definitions[id]
if spec then
local kind = spec.tg
local shade = nil
local n = 1
local a = spec.at
if kind == "linearGradient" then
shade = { s_shade_linear }
--
local x1 = a.x1
local y1 = a.y1
local x2 = a.x2
local y2 = a.y2
if x1 and y1 then
n = n + 1 shade[n] = f_shade_one(asnumber_vx(x1),asnumber_vy(y1))
end
if x2 and y2 then
n = n + 1 shade[n] = f_shade_one(asnumber_vx(x2),asnumber_vy(y2))
end
--
elseif kind == "radialGradient" then
shade = { s_shade_circular }
--
local cx = a.cx -- x center
local cy = a.cy -- y center
local r = a.r -- radius
local fx = a.fx -- focal points
local fy = a.fy -- focal points
--
if cx and cy then
-- todo
end
if r then
-- todo
end
if fx and fy then
-- todo
end
else
report("unknown gradient %a",id)
return
end
-- local gu = a.gradientUnits
-- local gt = a.gradientTransform
-- local sm = a.spreadMethod
local colora, colorb
for c in xmlcollected(spec,"/stop") do
local a = c.at
local offset = a.offset
local colorb = a["stop-color"]
local opacity = a["stop-opacity"]
colorb = colorb and (hexcolor3(colorb) or svgcolor[colorb] or colorb)
colora = colora or colorb
-- what if no percentage
local fraction = offset and asnumber_r(offset)
if not fraction then
-- offset = tonumber(offset)
-- for now
fraction = xmlcount(spec,"/stop")/100
end
n = n + 1 shade[n] = f_shade_step(fraction,colora,colorb)
prevcolor = color
end
return concat(shade)
end
end
local function drawproperties(stroke,a)
local w = a["stroke-width"]
if w then
w = f_pen(asnumber_r(w))
else
w = ""
end
local d = a["stroke-dasharray"]
if d ~= "none" then
local o = a["stroke-dashoffset"]
if o ~= "none" then
o = asnumber_r(o)
else
o = false
end
d = dashed(d,o)
else
d = ""
end
local c = hexcolor(stroke)
if not c then
c = rgbacolor(stroke)
if not c then
c = f_color(svgcolor[stroke] or stroke)
end
end
local o = a["stroke-opacity"] or a.opacity
if o ~= "none" then
o = asnumber_r(o)
if o and o ~= 1 then
o = f_opacity(o)
else
o = ""
end
else
o = ""
end
return w, d, c, o
end
local function fillproperties(fill,a)
local c = gradient(fill)
if not c then
c = hexcolor(fill)
if not c then
c = f_color(svgcolor[fill] or fill)
end
end
local o = a["fill-opacity"] or a.opacity
if o == "none" then
o = asnumber_r(o)
if o and o ~= 1 then
o = f_opacity(asnumber_r(o))
else
o = ""
end
else
o = ""
end
return c, o
end
-- todo: clip = [ auto | rect(llx,lly,urx,ury) ]
local function offset(a)
local x = a.x
local y = a.y
if x then x = asnumber_vx(x) end
if y then y = asnumber_vy(y) end
if not x then x = 0 end
if not y then y = 0 end
if x ~= 0 or y ~= 0 then
r = r + 1 ; result[r] = s_offset_start
return function()
r = r + 1 ; result[r] = f_offset_stop(x,-y)
end
end
end
local function viewport(x,y,w,h,noclip)
r = r + 1 ; result[r] = f_viewport_start
return function()
if x ~= 0 or y ~= 0 then
r = r + 1 ; result[r] = f_viewport_shift(-x,y)
end
if not noclip then
r = r + 1 ; result[r] = f_viewport_clip(w,-h)
end
r = r + 1 ; result[r] = f_viewport_stop
end
end
function handlers.defs(c,top)
for c in xmlcollected(c,"/*") do
local a = c.at
local id = a.id
-- setmetatableindex(a,top)
if id then
definitions["#" .. id ] = c
definitions["url(#" .. id .. ")"] = c
end
end
end
function handlers.use(c,top)
local a = setmetatableindex(c.at,top)
local id = a["xlink:href"] -- better a rawget
if id then
local d = definitions[id]
if d then
local h = handlers[d.tg]
if h then
h(d,a)
end
else
local res = locate(id)
if res then
local wrapup = offset(a)
process(res,"/*",top)
if wrapup then
wrapup()
end
else
report("unknown definition %a",id)
end
end
end
end
local linecaps = { butt = "butt", square = "squared", round = "rounded" }
local linejoins = { miter = "mitered", bevel = "beveled", round = "rounded" }
local function stoplineproperties()
r = r + 1 result[r] = s_endgroup
end
local function startlineproperties(a)
local cap = a["stroke-linecap"]
local join = a["stroke-linejoin"]
local limit = a["stroke-miterlimit"]
cap = cap ~= "none" and linecaps [cap] or false
join = join ~= "none" and linejoins[join] or false
limit = limit ~= "none" and asnumber_r(limit) or false
if cap or join or limit then
r = r + 1 result[r] = s_begingroup
if cap then
r = r + 1 result[r] = f_linecap(cap)
end
if join then
r = r + 1 result[r] = f_linejoin(join)
end
if limit then
r = r + 1 result[r] = f_miterlimit(limit)
end
return stoplineproperties
end
end
local function flush(a,shape,nofill)
local fill = not nofill and a.fill
local stroke = a.stroke
local cpath = a["clip-path"]
local trans = a.transform
local b, e = "", ""
if cpath then
cpath = clippath(cpath,a)
end
if cpath then
r = r + 1 result[r] = s_clip_start
end
if trans then
b, e = transform(trans)
end
if fill and fill ~= "none" then
r = r + 1 result[r] = (a["fill-rule"] == "evenodd" and f_eofill or f_fill)(b,shape,e,fillproperties(fill,a))
end
if stroke and stroke ~= "none" and stroke ~= 0 then
local wrapup = startlineproperties(a)
r = r + 1 result[r] = f_draw(b,shape,e,drawproperties(stroke,a))
if wrapup then
wrapup()
end
end
if cpath then
r = r + 1 result[r] = (cpath.evenodd and f_eoclip_stop or f_clip_stop)(cpath[1])
end
end
-- todo: strokes in:
local function flushpath(a,shape)
local fill = a.fill
local stroke = a.stroke
local cpath = a["clip-path"]
local trans = a.transform
local b, e = "", ""
if cpath then
cpath = definitions[cpath]
end
if cpath then
r = r + 1 result[r] = s_clip_start
end
-- todo: image (nicer for transform too)
if trans then
b, e = transform(trans)
end
if fill and fill ~= "none" then
local n = #shape
for i=1,n do
r = r + 1
if i == n then
local f = a["fill-rule"] == "evenodd"
if shape.closed then
f = f and f_eofill or f_fill
elseif shape.curve then
f = f and f_eofill_cycle_c or f_fill_cycle_c
else
f = f and f_eofill_cycle_l or f_fill_cycle_l
end
result[r] = f(b,shape[i],e,fillproperties(fill,a))
else
result[r] = f_nofill(b,shape[i],e)
end
end
end
if stroke and stroke ~= "none" and stroke ~= 0 then
local wrapup = startlineproperties(a)
local n = #shape
for i=1,n do
r = r + 1
if i == n then
result[r] = f_draw(b,shape[i],e,drawproperties(stroke,a))
else
result[r] = f_nodraw(b,shape[i],e)
end
end
if wrapup then
wrapup()
end
end
if cpath then
r = r + 1 result[r] = f_clip_stop(cpath[1])
end
end
function handlers.line(c,top)
local a = setmetatableindex(c.at,top)
local x1 = asnumber_vx(a.x1)
local y1 = asnumber_vy(a.y1)
local x2 = asnumber_vx(a.x2)
local y2 = asnumber_vy(a.y2)
if trace then
report("line: x1 %.3N, y1 %.3N, x2 %.3N, x3 %.3N",x1,y1,x2,y2)
end
flush(a,f_line(x1,y1,x2,y2),true)
end
function handlers.rect(c,top)
local a = setmetatableindex(c.at,top)
local w = asnumber_x(a.width)
local h = asnumber_y(a.height)
local x = asnumber_vx(a.x)
local y = asnumber_vy(a.y) - h
local rx = a.rx
local ry = a.ry
if rx == 0 then rx = false end -- maybe no default 0
if ry == 0 then ry = false end -- maybe no default 0
if rx or ry then
rx = asnumber_x(rx or ry)
ry = asnumber_y(ry or rx)
if trace then
report("rect: x %.3N, y %.3N, w %.3N, h %.3N, rx %.3N, ry %.3N",x,y,w,h,rx,ry)
end
flush(a,f_rounded(w,h,rx,ry,x,y))
else
if trace then
report("rect: x %.3N, y %.3N, w %.3N, h %.3N",x,y,w,h)
end
flush(a,f_rectangle(w,h,x,y))
end
end
function handlers.ellipse(c,top)
local a = setmetatableindex(c.at,top)
local x = asnumber_vx(a.cx)
local y = asnumber_vy(a.cy)
local rx = asnumber_x (a.rx)
local ry = asnumber_y (a.ry)
if trace then
report("ellipse: x %.3N, y %.3N, rx %.3N, ry %.3N",x,y,rx,ry)
end
flush(a,f_ellipse(2*rx,2*ry,x,y))
end
function handlers.circle(c,top)
local a = setmetatableindex(c.at,top)
local x = asnumber_vx(a.cx)
local y = asnumber_vy(a.cy)
local r = asnumber_r (a.r)
if trace then
report("circle: x %.3N, y %.3N, r %.3N",x,y,r)
end
flush(a,f_circle(2*r,x,y))
end
function handlers.path(c,top)
local a = setmetatableindex(c.at,top)
local d = a.d
if d then
local p = grabpath(d)
if trace then
report("path: %i entries, %sclosed",p.entries,p.closed and "" or "not ")
end
flushpath(a,p)
end
end
do
local p_pair = p_separator^0 * p_number_vx * p_separator^0 * p_number_vy
local p_pair_z = p_pair / f_lineto_z
local p_pair_n = p_pair / f_lineto_n
local p_open = Cc("(")
local p_close = Carg(1) * P(true) / function(s) return s end
local p_polyline = Cs(p_open * p_pair_z * p_pair_n^0 * p_close)
function handlers.polyline(c,top)
local a = setmetatableindex(c.at,top)
local p = a.points
if p then
flush(a,lpegmatch(p_polyline,p,1,")"),true)
end
end
function handlers.polygon(c,top)
local a = setmetatableindex(c.at,top)
local p = a.points
if p then
flush(a,lpegmatch(p_polyline,p,1,"--cycle)"))
end
end
end
function handlers.g(c,top)
local a = c.at
setmetatableindex(a,top)
process(c,"/*",a)
end
function handlers.symbol(c,top)
report("todo: %s","symbol")
end
-- We only need to filter classes .. I will complete this when I really need
-- it. Not hard to do but kind of boring.
local p_class = P(".") * C((R("az","AZ","09","__","--")^1))
local p_spec = P("{") * C((1-P("}"))^1) * P("}")
local p_grab = ((Carg(1) * p_class * p_space^0 * p_spec / function(t,k,v) t[k] = v end) + p_space^1 + P(1))^1
function handlers.style(c,top)
local s = xmltext(c)
lpegmatch(p_grab,s,1,styles)
for k, v in next, styles do
-- todo: lpeg
local t = { }
for k, v in gmatch(v,"%s*([^:]+):%s*([^;]+);") do
if k == "font" then
v = xml.css.fontspecification(v)
end
t[k] = v
end
styles[k] = t
end
bodyfont = tex.getdimen("bodyfontsize") / 65536
end
-- this will never really work out
function handlers.text(c,top)
local a = c.at
local x = asnumber_vx(a.x)
local y = asnumber_vy(a.y)
local text = xmltext(c)
local size = false
local fill = a.fill
-- escape text or keep it at the tex end
local class = a.class
if class then
local style = styles[class]
if style and next(style) then
local font = style.font
local s_family = font and font.family
local s_style = font and font.style
local s_weight = font and font.weight
local s_size = font and font.size
if s_size then
local f = factors[s_size[2]]
if f then
size = f * s_size[1]
end
end
-- todo: family: serif | sans-serif | monospace : use mapping
if s_family then
if s_family == "serif" then
text = "\\rm " .. text
elseif s_family == "sans-serif" then
text = "\\ss " .. text
else
text = "\\tt " .. text
end
end
if s_style or s_weight then
text = formatters['\\style[%s%s]{%s}'](s_weight or "",s_style or "",text)
end
fill = style.fill or fill
end
end
if size then
-- bodyfontsize
size = size/bodyfont
text = f_text_scaled(text,size,x,y)
else
text = f_text_normal(text,x,y)
end
if fill and fill ~= "none" then
text = f_draw("",text,"",fillproperties(fill,a))
else
text = f_draw("",text,"","","","","")
end
if trace then
report("text: x %.3N, y %.3N, text %s",x,y,text)
end
r = r + 1 ; result[r] = text
end
function handlers.svg(c,top,x,y,w,h,noclip,notransform,normalize)
local a = setmetatableindex(c.at,top)
local v = a.viewBox
local t = a.transform
local wrapupoffset
local wrapupviewport
local btransform
local etransform
local bhacked
local ehacked
local wd = w
-- local ex, em
local xpct, ypct, rpct
if notransform then
-- t = nil
end
if trace then
report("view: %s, xpct %.3N, ypct %.3N","before",percentage_x,percentage_y)
end
if v then
x, y, w, h = viewbox(v)
if trace then
report("viewbox: x %.3N, y %.3N, width %.3N, height %.3N",x,y,w,h)
end
end
if h then
--
-- em = factors["em"]
-- ex = factors["ex"]
-- factors["em"] = em
-- factors["ex"] = ex
--
xpct = percentage_x
ypct = percentage_y
rpct = percentage_r
percentage_x = w / 100
percentage_y = h / 100
percentage_r = (sqrt(w^2 + h^2) / sqrt(2)) / 100
if trace then
report("view: %s, xpct %.3N, ypct %.3N","inside",percentage_x,percentage_y)
end
wrapupviewport = viewport(x,y,w,h,noclip)
end
-- todo: combine transform and offset here
if t then
btransform, etransform = transform(t,true)
end
-- some fonts need this (bad transforms + viewbox)
if v and normalize and w and wd and w ~= wd and w > 0 and wd > 0 then
bhacked = s_hacked_start
ehacked = f_hacked_stop(y or 0,wd/w)
end
if btransform then
r = r + 1 ; result[r] = btransform
end
if bhacked then
r = r + 1 ; result[r] = bhacked
end
wrapupoffset = offset(a)
process(c,"/*",top or defaults)
if wrapupoffset then
wrapupoffset()
end
if ehacked then
r = r + 1 ; result[r] = ehacked
end
if etransform then
r = r + 1 ; result[r] = etransform
end
if h then
--
-- factors["em"] = em
-- factors["ex"] = ex
--
percentage_x = xpct
percentage_y = ypct
percentage_r = rpct
if wrapupviewport then
wrapupviewport()
end
end
if trace then
report("view: %s, xpct %.3N, ypct %.3N","after",percentage_x,percentage_y)
end
end
process = function(x,p,top)
for c in xmlcollected(x,p) do
local h = handlers[c.tg]
if h then
h(c,top)
end
end
end
function metapost.svgtomp(specification,pattern,notransform,normalize)
local mps = ""
local svg = specification.data
if type(svg) == "string" then
svg = xmlconvert(svg)
end
if svg then
local c = xmlfirst(svg,pattern or "/svg")
if c then
root, result, r, definitions, styles, bodyfont = svg, { }, 0, { }, { }, 12
-- print("default",x,y,w,h)
handlers.svg (
c,
nil,
specification.x,
specification.y,
specification.width,
specification.height,
specification.noclip,
notransform,
normalize
)
mps = concat(result," ")
root, result, r, definitions, styles, bodyfont = false, false, false, false, false, false
else
report("missing svg root element")
end
else
report("bad svg blob")
end
return mps
end
end
-- These helpers might move to their own module .. some day ...
function metapost.showsvgpage(data)
local dd = data.data
if type(dd) == "table" then
local comment = dd.comment
local offset = dd.pageoffset
for i=1,#dd do
local d = setmetatableindex( {
data = dd[i],
comment = comment and i or false,
pageoffset = offset or nil,
}, data)
metapost.showsvgpage(d)
end
else
context.startMPpage { instance = "doublefun", offset = data.pageoffset or nil }
context(metapost.svgtomp(data))
local comment = data.comment
if comment then
context("draw boundingbox currentpicture withcolor .6red ;")
context('draw textext.bot("\\strut\\tttf %s") ysized (10pt) shifted center bottomboundary currentpicture ;',comment)
end
context.stopMPpage()
end
end
function metapost.svgtopdf(data,...)
local mps = metapost.svgtomp(data,...)
if mps then
local pdf = metapost.simple("metafun",mps,true) -- todo: special instance, only basics needed
if pdf then
return pdf
else
-- message
end
else
-- message
end
end
do
local runner = sandbox.registerrunner {
name = "otfsvg2pdf",
program = "context",
template = "--batchmode --purgeall --runs=2 %filename%",
reporter = report_svg,
}
-- By using an independent pdf file instead of pdf streams we can use resources and still
-- cache. This is the old method updated. Maybe a future version will just do this runtime
-- but for now this is the most efficient method.
local decompress = gzip.decompress
local compress = gzip.compress
function metapost.svgshapestopdf(svgshapes,pdftarget,report_svg)
local texname = "temp-otf-svg-to-pdf.tex"
local pdfname = "temp-otf-svg-to-pdf.pdf"
local tucname = "temp-otf-svg-to-pdf.tuc"
local nofshapes = #svgshapes
local pdfpages = { filename = pdftarget }
local pdfpage = 0
local t = { }
local n = 0
--
os.remove(texname)
os.remove(pdfname)
os.remove(tucname)
--
if report_svg then
report_svg("processing %i svg containers",nofshapes)
statistics.starttiming(pdfpages)
end
--
-- can be option:
--
n = n + 1 ; t[n] = "\\enabledirectives[pdf.stripzeros,metapost.stripzeros]"
--
-- can be option:
--
-- n = n + 1 ; t[n] = "\\nopdfcompression"
--
n = n + 1 ; t[n] = "\\starttext"
n = n + 1 ; t[n] = "\\setupMPpage[alternative=offset,instance=doublefun]"
--
for i=1,nofshapes do
local entry = svgshapes[i]
local data = entry.data
if decompress then
data = decompress(data,128*1024) or data
end
local specification = {
data = xmlconvert(data),
x = 0,
y = 1000,
width = 1000,
height = 1000,
noclip = true,
}
for index=entry.first,entry.last do
if not pdfpages[index] then
pdfpage = pdfpage + 1
pdfpages[index] = pdfpage
local pattern = "/svg[@id='glyph" .. index .. "']"
n = n + 1 ; t[n] = "\\startMPpage"
n = n + 1 ; t[n] = metapost.svgtomp(specification,pattern,true,true) or ""
n = n + 1 ; t[n] = "\\stopMPpage"
end
end
end
n = n + 1 ; t[n] = "\\stoptext"
io.savedata(texname,concat(t,"\n"))
runner { filename = texname }
os.remove(pdftarget)
file.copy(pdfname,pdftarget)
if report_svg then
statistics.stoptiming(pdfpages)
report_svg("svg conversion time %s",statistics.elapsedseconds(pdfpages))
end
os.remove(texname)
os.remove(pdfname)
os.remove(tucname)
return pdfpages
end
function metapost.svgshapestomp(svgshapes,report_svg)
local nofshapes = #svgshapes
local mpshapes = { }
if report_svg then
report_svg("processing %i svg containers",nofshapes)
statistics.starttiming(mpshapes)
end
for i=1,nofshapes do
local entry = svgshapes[i]
local data = entry.data
if decompress then
data = decompress(data,128*1024) or data
end
local specification = {
data = xmlconvert(data),
x = 0,
y = 1000,
width = 1000,
height = 1000,
noclip = true,
}
for index=entry.first,entry.last do
if not mpshapes[index] then
local pattern = "/svg[@id='glyph" .. index .. "']"
local mpcode = metapost.svgtomp(specification,pattern,true,true) or ""
if mpcode ~= "" and compress then
mpcode = compress(mpcode) or mpcode
end
mpshapes[index] = mpcode
end
end
end
if report_svg then
statistics.stoptiming(mpshapes)
report_svg("svg conversion time %s",statistics.elapsedseconds(mpshapes))
end
return mpshapes
end
function metapost.svgglyphtomp(fontname,unicode)
if fontname and unicode then
local id = fonts.definers.internal { name = fontname }
if id then
local tfmdata = fonts.hashes.identifiers[id]
if tfmdata then
local properties = tfmdata.properties
local svg = properties.svg
local hash = svg and svg.hash
local timestamp = svg and svg.timestamp
if hash then
local svgfile = containers.read(fonts.handlers.otf.svgcache,hash)
local svgshapes = svgfile and svgfile.svgshapes
if svgshapes then
if type(unicode) == "string" then
unicode = utf.byte(unicode)
end
local chardata = tfmdata.characters[unicode]
local index = chardata and chardata.index
if index then
for i=1,#svgshapes do
local entry = svgshapes[i]
if index >= entry.first and index <= entry.last then
local data = entry.data
if data then
local root = xml.convert(gzip.decompress(data,128*1024) or data)
return metapost.svgtomp (
{
data = root,
x = 0,
y = 1000,
width = 1000,
height = 1000,
noclip = true,
},
"/svg[@id='glyph" .. index .. "']",
true,
true
)
end
end
end
end
end
end
end
end
end
end
end
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