add dumpops.lua as a sample scraper that just dumps the arguments

tools/lua/scrape.lua

--- just a helper function to dump the parameters, for debugging
 function tostr(t)
     local str = ""
     for k, v in next, t do
         if #str > 0 then
             str = str .. ", "
         end
         if type(k) == "number" then
             str = str .. "[" .. k .. "] = "
         else
             str = str .. tostring(k) .. " = "
@@ skipping 33 matching lines @@
 end
 
 --[[
     Called with the parameters to each canvas.draw call, where canvas is the
     current canvas as set by startcanvas()
 ]]
 function sk_scrape_accumulate(t)
     local n = total[t.verb] or 0
     total[t.verb] = n + 1
 
-    if false and t.verb == "drawRect" then
-        local m = canvas:getTotalMatrix()
-        print("... ", tostr(m), "\n")
+    if false and t.verb == "drawRect" and t.paint:isAntiAlias() then
+        local r = t.rect;
+        local p = t.paint;
+        local c = p:getColor();
+        print("drawRect ", tostr(r), tostr(c), "\n")
     end
 
     if false and t.verb == "drawPath" then
         local pred, r1, r2, d1, d2 = t.path:isNestedRects()
         
         if pred then
             print("drawRect_Nested", tostr(r1), tostr(r2), d1, d2)
         else
             print("drawPath", "isEmpty", tostring(t.path:isEmpty()),
                     "isRect", tostring(t.path:isRect()), tostr(t.path:getBounds()))
         end
     end
-
-    -- enable to dump all of the parameters we were sent
-    if false then
-        -- dump the params in t, specifically showing the verb first, which we
-        -- then nil out so it doesn't appear in tostr()
-        io.write(t.verb, " ")
-        t.verb = nil
-        io.write(tostr(t), "\n")
-    end
 end
 
 --[[
     lua_pictures will call this function after all of the pictures have been
     "accumulated".
 ]]
 function sk_scrape_summarize()
     io.write("\n{ ", tostr(total), " }\n")
 end