/usr/share/texlive/texmf-dist/tex/luatex/lua-visual-debug/lua-visual-debug.lua is in texlive-luatex 2012.20120611-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | -- Copyright 2012 Patrick Gundlach, patrick@gundla.ch
-- Public repository: https://github.com/pgundlach/lvdebug (issues/pull requests,...)
-- Version: 0.4
-- Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the
-- "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge,
-- publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do
-- so, subject to the following conditions:
--
-- The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
-- FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-- WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
module(...,package.seeall)
-- There are 65782 scaled points in a PDF point
-- Therefore we need to divide all TeX lengths by
-- this amount to get the PDF points.
local number_sp_in_a_pdf_point = 65782
-- The idea is the following: at page shipout, all elements on a page are fixed.
-- TeX creates an intermediate data structure before putting that into the PDF
-- We can "intercept" that data structure and add pdf_literal (whatist) nodes,
-- that makes glues, kerns and other items visible by drawing a rule, rectangle or
-- other visual aids.
-- This has no influence on typeset material, because these pdf_literal instructions
-- are only visible to the PDF file (PDF renderer) and have no size themselves.
-- We recursively loop through the contents of boxes and look at the (linear) list of
-- items in that box. We start at the "shipout box".
-- The "algorithm" goes like this:
--
-- head = pointer_to_beginning_of_box_material
-- while head is not nil
-- if this_item_is_a_box
-- recurse_into_contents
-- draw a rectangle around the contents
-- elseif this_item_is_a_glue
-- draw a rule that has the length of that glue
-- elseif this_item_is_a_kern
-- draw a rectangle with width of that kern
-- ...
-- end
-- move pointer to the next item in the list
-- -- the pointer is "nil" if there is no next item
-- end
function math.round(num, idp)
if idp and idp>0 then
local mult = 10^idp
return math.floor(num * mult + 0.5) / mult
end
return math.floor(num + 0.5)
end
function show_page_elements(parent)
local head = parent.list
while head do
if head.id == 0 or head.id == 1 then -- hbox / vbox
local rule_width = 0.1
local wd = math.round(head.width / number_sp_in_a_pdf_point - rule_width ,2)
local ht = math.round((head.height + head.depth) / number_sp_in_a_pdf_point - rule_width ,2)
local dp = math.round(head.depth / number_sp_in_a_pdf_point - rule_width / 2 ,2)
-- recurse into the contents of the box
show_page_elements(head)
local rectangle = node.new("whatsit","pdf_literal")
if head.id == 0 then -- hbox
rectangle.data = string.format("q 0.5 G %g w %g %g %g %g re s Q", rule_width, -rule_width / 2, -dp, wd, ht)
else
rectangle.data = string.format("q 0.1 G %g w %g %g %g %g re s Q", rule_width, -rule_width / 2, 0, wd, -ht)
end
head.list = node.insert_before(head.list,head.list,rectangle)
elseif head.id == 2 then -- rule
local show_rule = node.new("whatsit","pdf_literal")
if head.width == -1073741824 or head.height == -1073741824 or head.depth == -1073741824 then
-- ignore for now -- these rules are stretchable
else
local dp = math.round( head.depth / number_sp_in_a_pdf_point ,2)
local ht = math.round( head.height / number_sp_in_a_pdf_point ,2)
show_rule.data = string.format("q 1 0 0 RG 1 0 0 rg 0.4 w 0 %g m 0 %g l S Q",-dp,ht)
end
parent.list = node.insert_before(parent.list,head,show_rule)
elseif head.id == 7 then -- disc
local hyphen_marker = node.new("whatsit","pdf_literal")
hyphen_marker.data = "q 0 0 1 RG 0.3 w 0 -1 m 0 0 l S Q"
parent.list = node.insert_before(parent.list,head,hyphen_marker)
elseif head.id == 10 then -- glue
local wd = head.spec.width
local color = "0.5 G"
if parent.glue_sign == 1 and parent.glue_order == head.spec.stretch_order then
wd = wd + parent.glue_set * head.spec.stretch
color = "0 0 1 RG"
elseif parent.glue_sign == 2 and parent.glue_order == head.spec.shrink_order then
wd = wd - parent.glue_set * head.spec.shrink
color = "1 0 1 RG"
end
local pdfstring = node.new("whatsit","pdf_literal")
local wd_bp = math.round(wd / number_sp_in_a_pdf_point,2)
if parent.id == 0 then --hlist
pdfstring.data = string.format("q %s [0.2] 0 d 0.5 w 0 0 m %g 0 l s Q",color,wd_bp)
else -- vlist
pdfstring.data = string.format("q 0.1 G 0.1 w -0.5 0 m 0.5 0 l -0.5 %g m 0.5 %g l s [0.2] 0 d 0.5 w 0.25 0 m 0.25 %g l s Q",-wd_bp,-wd_bp,-wd_bp)
end
parent.list = node.insert_before(parent.list,head,pdfstring)
elseif head.id == 11 then -- kern
local rectangle = node.new("whatsit","pdf_literal")
local color = "1 1 0 rg"
if head.kern < 0 then color = "1 0 0 rg" end
local k = math.round(head.kern / number_sp_in_a_pdf_point,2)
if parent.id == 0 then --hlist
rectangle.data = string.format("q %s 0 w 0 0 %g 1 re B Q",color, k )
else
rectangle.data = string.format("q %s 0 w 0 0 1 %g re B Q",color, -k )
end
parent.list = node.insert_before(parent.list,head,rectangle)
elseif head.id == 12 then -- penalty
local color = "1 g"
local rectangle = node.new("whatsit","pdf_literal")
if head.penalty < 10000 then
color = string.format("%d g", 1 - head.penalty / 10000)
end
rectangle.data = string.format("q %s 0 w 0 0 1 1 re B Q",color)
parent.list = node.insert_before(parent.list,head,rectangle)
end
head = head.next
end
return true
end
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