Add code to lua paths to get the fill path and get lists of verbs and

points

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2199823002

Review-Url: https://codereview.chromium.org/2199823002

1 files changed, 60 insertions, 0 deletions

diff --git a/tools/lua/count_dashes.lua b/tools/lua/count_dashes.lua
new file mode 100644
index 0000000000..20502a9f01
--- /dev/null
+++ b/tools/lua/count_dashes.lua
@@ -0,0 +1,60 @@
+--
+-- Copyright 2016 Google Inc.
+--
+-- Use of this source code is governed by a BSD-style license that can be
+-- found in the LICENSE file.
+--
+
+-- Dashed path scraping script.
+-- This script is designed to count the total number of dashes in a dashed path
+-- by computing the fill path and then counting how many individual segments are
+-- inside the resulting fill path.
+
+dashes = 0
+
+pathPieces = {}
+
+function sk_scrape_startcanvas(c, fileName)
+end
+
+function sk_scrape_endcanvas(c, fileName)
+end
+
+function sk_scrape_accumulate(t)
+    local paint = t.paint
+    if paint then
+        local pe = paint:getPathEffect()
+        if pe then
+            if t.verb == "drawPath" and pe:asADash() then
+                dashes = dashes + 1
+                pathPieces[dashes] = 0
+
+                local path = t.path
+                local fillpath = paint:getFillPath(path)
+                local verbs = fillpath:getVerbs()
+                for _, verb in ipairs(verbs) do
+                    if verb == "move" then
+                       pathPieces[dashes] = pathPieces[dashes] + 1
+                    end
+                end
+            end
+        end
+    end
+end
+
+-- We mulitply by two because for each segment of the dash, we do two measurements:
+-- One for the beginning and one for the end of each dash.
+function sk_scrape_summarize() 
+    local pieces5 = 0;
+    local pieces10 = 0;
+    for _, p in ipairs(pathPieces) do
+        local pieces = 2*p
+        if pieces < 5 then
+            pieces5 = pieces5 + 1
+        end
+        if pieces > 5 and pieces < 10 then
+            pieces10 = pieces10 + 1
+        end
+    end
+    io.write(string.format("%d %d %d\n", 2*dashes, pieces5, pieces10))
+end