Cleanup & optimize performance of IO (switch to libspng)

.ci/build-platform.yml

@@ -32,6 +32,11 @@ jobs:
         continueOnError: true
         condition: and(eq(variables['AGENT.OS'], 'Windows_NT'), and(eq(variables['Build.Reason'], 'PullRequest'), and(succeeded(), ne(variables['Build.SourceBranch'], variables['System.PullRequest.TargetBranch']))))
         displayName: "Print tar help"
+      # https://github.com/esy/pesy/commit/3aeaad2550edcf4ac8e259400279a564a92a194e
+      - powershell: Write-Host "##vso[task.setvariable variable=HOME;]D:\"
+        continueOnError: true
+        condition: eq(variables['AGENT.OS'], 'Windows_NT')
+        displayName: "Make sure $HOME is same is Agent.BuildDirectory"
       - bash: |
           # COMPUTE THE ESY INSTALL CACHE LOCATION AHEAD OF TIME
           DESIRED_LEN="86"

.ci/utils/use-esy.yml

@@ -1,5 +1,5 @@
 # steps to install esy globally
 
 steps:
-  - script: "npm install -g @esy-nightly/esy"
+  - script: "npm install -g esy"
     displayName: "install esy"

bin/Main.re

@@ -1,13 +1,10 @@
 open Odiff.ImageIO;
 open Odiff.Diff;
 
-let getIOModule = (filename, ~antialiasing) =>
+let getIOModule = filename =>
   Filename.extension(filename)
   |> (
     fun
-    | ".png" when antialiasing => (
-        (module ODiffIO.Png.BigarrayIO): (module ImageIO)
-      )
     | ".png" => ((module ODiffIO.Png.IO): (module ImageIO))
     | ".jpg"
     | ".jpeg" => ((module ODiffIO.Jpg.IO): (module ImageIO))
@@ -34,8 +31,8 @@ let main =
       antialiasing,
       ignoreRegions,
     ) => {
-  module IO1 = (val getIOModule(img1Path, ~antialiasing));
-  module IO2 = (val getIOModule(img2Path, ~antialiasing));
+  module IO1 = (val getIOModule(img1Path));
+  module IO2 = (val getIOModule(img2Path));
 
   module Diff = MakeDiff(IO1, IO2);