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1if not modules then modules = { } end modules ['grph-wnd'] = {
2    version   = 1.001,
3    comment   = "companion to grph-inc.mkiv",
4    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
5    copyright = "PRAGMA ADE / ConTeXt Development Team",
6    license   = "see context related readme files"
7}
8
9-- Thanks to Luigi Scarso for making graphic magic work in luatex.
10--
11-- \externalfigure[hacker.jpeg][width=4cm,conversion=gray.jpg]
12
13local converters, suffixes = figures.converters, figures.suffixes
14
15local trace_conversion = false  trackers.register("figures.conversion", function(v) trace_conversion = v end)
16
17local report_wand = logs.reporter("graphics","wand")
18
19local function togray(oldname,newname)
20    if lfs.isfile(oldname) then
21        require("gmwand")
22        if trace_conversion then
23            report_wand("converting %a to %a using gmwand",oldname,newname)
24        end
25        gmwand.InitializeMagick("./") -- What does this path do?
26        local wand = gmwand.NewMagickWand()
27        gmwand.MagickReadImage(wand,oldname)
28        gmwand.MagickSetImageColorspace(wand,gmwand.GRAYColorspace)
29        gmwand.MagickWriteImages(wand,newname,1)
30        gmwand.DestroyMagickWand(wand)
31    else
32        report_wand("unable to convert %a to %a using gmwand",oldname,newname)
33    end
34end
35
36local formats = { "png", "jpg", "gif" }
37
38for i=1,#formats do
39    local oldformat = formats[i]
40    local newformat = "gray." .. oldformat
41    if trace_conversion then
42        report_wand("installing converter for %a to %a",oldformat,newformat)
43    end
44    converters[oldformat]            = converters[oldformat] or { }
45    converters[oldformat][newformat] = togray
46    suffixes  [newformat]            = oldformat
47end
48