add initial scraper for dashing
BUG=skia:
R=bsalomon@google.com
Author: reed@google.com
Review URL: https://codereview.chromium.org/196603027
git-svn-id: http://skia.googlecode.com/svn/trunk@13843 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/lua/scrape_dashing.lua b/tools/lua/scrape_dashing.lua
new file mode 100644
index 0000000..48f3538
--- /dev/null
+++ b/tools/lua/scrape_dashing.lua
@@ -0,0 +1,93 @@
+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) .. " = "
+ end
+ if type(v) == "table" then
+ str = str .. "{ " .. tostr(v) .. " }"
+ else
+ str = str .. tostring(v)
+ end
+ end
+ return str
+end
+
+local total_found = {} -- accumulate() stores its data in here
+local total_total = {}
+local canvas -- holds the current canvas (from startcanvas())
+
+--[[
+ startcanvas() is called at the start of each picture file, passing the
+ canvas that we will be drawing into, and the name of the file.
+
+ Following this call, there will be some number of calls to accumulate(t)
+ where t is a table of parameters that were passed to that draw-op.
+
+ t.verb is a string holding the name of the draw-op (e.g. "drawRect")
+
+ when a given picture is done, we call endcanvas(canvas, fileName)
+]]
+function sk_scrape_startcanvas(c, fileName)
+ canvas = c
+end
+
+--[[
+ Called when the current canvas is done drawing.
+]]
+function sk_scrape_endcanvas(c, fileName)
+ canvas = nil
+end
+
+function increment(table, key)
+ table[key] = (table[key] or 0) + 1
+end
+
+
+local drawPointsTable = {}
+local drawPointsTable_direction = {}
+
+function sk_scrape_accumulate(t)
+ increment(total_total, t.verb)
+
+ local p = t.paint
+ if p then
+ local pe = p:getPathEffect();
+ if pe then
+ increment(total_found, t.verb)
+ end
+ end
+
+ if "drawPoints" == t.verb then
+ local points = t.points
+ increment(drawPointsTable, #points)
+ if 2 == #points then
+ if points[1].y == points[2].y then
+ increment(drawPointsTable_direction, "hori")
+ elseif points[1].x == points[2].x then
+ increment(drawPointsTable_direction, "vert")
+ else
+ increment(drawPointsTable_direction, "other")
+ end
+ end
+ end
+end
+
+--[[
+ lua_pictures will call this function after all of the pictures have been
+ "accumulated".
+]]
+function sk_scrape_summarize()
+ for k, v in next, total_found do
+ io.write(k, " = ", v, "/", total_total[k], "\n")
+ end
+ print("histogram of point-counts for all drawPoints calls")
+ print(tostr(drawPointsTable))
+ print(tostr(drawPointsTable_direction))
+end
+