Add hard stop count

tools/lua/gradients.lua

 function sk_scrape_startcanvas(c, fileName) end
 function sk_scrape_endcanvas(c, fileName) end
 
+SkScalarNearlyZero = 1.0 / bit32.lshift(1.0, 12)

[reed1, 2016/07/12 15:44:46]

since lua just has doubles, I don't think it helps to call this SkScalar

+
+function SkScalarNearlyEqual(a, b)
+    return math.abs(a,b) <= SkScalarNearlyZero
+end
+
 gradients = {}
 
 i = 1
 
 function sk_scrape_accumulate(t)
     local p = t.paint
     if p then
         local s = p:getShader()
         if s then
             local g = s:asAGradient()
             if g then
                 gradients[i] = {}
-                gradients[i].colorCount        = g.colorCount
-                gradients[i].type              = g.type
-                gradients[i].tile              = g.tile
-                gradients[i].isEvenlySpaced    = g.isEvenlySpaced
-                gradients[i].containsHardStops = g.containsHardStops
+
+                gradients[i].colorCount = g.colorCount
+                gradients[i].type       = g.type
+                gradients[i].tile       = g.tile
+
+                numHardStops   = 0
+                isEvenlySpaced = true
+                for j = 2, g.colorCount, 1 do
+                    if not SkScalarNearlyEqual(g.positions[j], j/(g.colorCount-1)) then
+                        isEvenlySpaced = false
+                    end
+
+                    if SkScalarNearlyEqual(g.positions[j], g.positions[j-1]) then
+                        numHardStops = numHardStops + 1
+                    end
+                end
+
+                gradients[i].isEvenlySpaced = isEvenlySpaced
+                gradients[i].numHardStops   = numHardStops;
 
                 gradients[i].positions = {}
                 for j = 1, g.colorCount, 1 do
                     gradients[i].positions[j] = g.positions[j]
                 end
 
                 i = i + 1
             end
         end
     end
 end
 
 function sk_scrape_summarize()
     for k, v in pairs(gradients) do
         local pos = ""
         for j = 1, v.colorCount , 1 do
             pos = pos .. v.positions[j]
             if j ~= v.colorCount then
                 pos = pos .. ","
             end
         end
 
         io.write(string.format("%d %s %s %d %d %s\n",
                                 v.colorCount,
                                 v.type,
                                 v.tile,
                                 tonumber(v.isEvenlySpaced and 1 or 0),
-                                tonumber(v.containsHardStops and 1 or 0),
+                                v.numHardStops,
                                 pos))
     end
 end