add reflowing benchmark

spec/unit/benchmark_spec.lua

@@ -1,5 +1,4 @@
 require "defaults"
-require "libs/libkoreader-luagettext"
 package.path = "?.lua;common/?.lua;frontend/?.lua"
 package.cpath = "?.so;common/?.so;/usr/lib/lua/?.so"
 
@@ -8,12 +7,12 @@ einkfb = require("ffi/framebuffer")
 -- do not show SDL window
 einkfb.dummy = true
 Blitbuffer = require("ffi/blitbuffer")
-util = require("ffi/util")
 
 local Screen = require("ui/screen")
 local DocSettings = require("docsettings")
 G_reader_settings = DocSettings:open(".reader")
 local DocumentRegistry = require("document/documentregistry")
+local util = require("ffi/util")
 local DEBUG = require("dbg")
 
 -- screen should be inited for crengine
@@ -33,7 +32,7 @@ end
 describe("PDF rendering benchmark", function()
     local sample_pdf = "spec/front/unit/data/sample.pdf"
     local doc = DocumentRegistry:openDocument(sample_pdf)
-    for pageno = 1, doc.info.number_of_pages do
+    for pageno = 1, math.min(10, doc.info.number_of_pages) do
         local secs, usecs = util.gettime()
         assert.truthy(doc:renderPage(pageno, nil, 1, 0, 1.0, 0))
         local nsecs, nusecs = util.gettime()
@@ -43,3 +42,17 @@ describe("PDF rendering benchmark", function()
     doc:close()
 end)
 
+describe("PDF reflowing benchmark", function()
+    local sample_pdf = "spec/front/unit/data/sample.pdf"
+    local doc = DocumentRegistry:openDocument(sample_pdf)
+    doc.configurable.text_wrap = 1
+    for pageno = 1, math.min(10, doc.info.number_of_pages) do
+        local secs, usecs = util.gettime()
+        assert.truthy(doc:renderPage(pageno, nil, 1, 0, 1.0, 0))
+        local nsecs, nusecs = util.gettime()
+        local dur = nsecs - secs + (nusecs - usecs) / 1000000
+        logDuration("pdf_reflowing.log", pageno, dur)
+    end
+    doc:close()
+end)
+