1 files changed, 74 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/grph-pat.lua b/tex/context/base/mkiv/grph-pat.lua
new file mode 100644
index 000000000..c5e4b9f64
--- /dev/null
+++ b/tex/context/base/mkiv/grph-pat.lua
@@ -0,0 +1,74 @@
+if not modules then modules = { } end modules ['grph-pat'] = {
+    version   = 1.001,
+    comment   = "companion to grph-pat.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+-- This is just a proof of concept. Viewers behave different (offsets) and Acrobat doesn't
+-- show xform based patterns.
+--
+-- This module will be cleaned up and use codeinjections and such.
+
+local texsetbox   = tex.setbox
+local texgetbox   = tex.getbox
+
+local nodepool    = nodes.pool
+local new_literal = nodepool.pdforiginliteral -- really ?
+local new_hlist   = nodepool.hlist
+
+local names       = { }
+
+interfaces.implement {
+    name      = "registerpattern",
+    arguments = { {
+        { "name" },
+        { "number", "integer" },
+        { "width", "dimension" },
+        { "height", "dimension" },
+        { "hoffset", "dimension" },
+        { "voffset", "dimension" },
+    } },
+    actions   = function(specification)
+        local number = specification.number
+        local name   = specification.name
+        local box    = texgetbox(number)
+        if not name or name == "" then
+            return
+        end
+        nodes.handlers.finalize(box)
+        names[name] = lpdf.registerpattern {
+            number  = number,
+            width   = specification.width  or  box.width,
+            height  = specification.height or (box.height + box.depth) ,
+            hoffset = specification.hoffset,
+            voffset = specification.voffset,
+        }
+    end
+}
+
+interfaces.implement {
+    name      = "applypattern",
+    arguments = { {
+        { "name" },
+        { "number", "integer" },
+        { "width", "dimension" },
+        { "height", "dimension" },
+    } },
+    actions   = function(specification)
+        local number = specification.number
+        local name   = specification.name
+        local width  = specification.width
+        local height = specification.height
+        if not name or name == "" then
+            return
+        end
+        local p = names[name]
+        if p then
+            local l = new_literal(lpdf.patternstream(p,width,height))
+            local h = new_hlist(l,width,height)
+            texsetbox(number,h)
+        end
+    end
+}