Parametrize, add node module

.gitignore

@@ -1,2 +1,7 @@
+/@types/
+/lib/
+/node_modules/
+/package-lock.json
 /output_im.jpg
 /output_pyvips.jpg
+/.log/

compare.sh

@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-time python ./main.py
+# using different transform parameters, as vips takes backward parameters, and imagemagic takes forward parameters
+
+time python ./main.py demo.jpg '2.39014,0.381091,-5.07071e-13,8.09745e-16,2.45629,-1.95474e-12,0.000344095,0.0000931351' output_pyvips.jpg
 
 time convert demo.jpg -virtual-pixel Transparent -distort PerspectiveProjection '0.418385,-0.064912,1.11204e-12,-1.07285e-16,0.407118,1.85136e-13,-0.000143964,-0.0000155811'  output_im.jpg

main.py

@@ -1,8 +1,11 @@
 #!/usr/bin/env python3
 
 import pyvips
+import sys
 
-image = pyvips.Image.new_from_file("demo.jpg", access="random")
+print(sys.argv)
+
+image = pyvips.Image.new_from_file(sys.argv[1], access="random")
 
 # T = [
 #     0.418385,
@@ -15,16 +18,19 @@ image = pyvips.Image.new_from_file("demo.jpg", access="random")
 #     -0.0000155811,
 # ]
 
-T = [
+# T = [
-    2.39014,
+#     2.39014,
-    0.381091,
+#     0.381091,
-    -5.07071e-13,
+#     -5.07071e-13,
-    8.09745e-16,
+#     8.09745e-16,
-    2.45629,
+#     2.45629,
-    -1.95474e-12,
+#     -1.95474e-12,
-    0.000344095,
+#     0.000344095,
-    0.0000931351,
+#     0.0000931351,
-]
+# ]
+
+
+T = list(map(float, sys.argv[2].split(",")))
 
 i = pyvips.Image.xyz(image.width, image.height)
 
@@ -35,4 +41,4 @@ m = x.bandjoin(y)
 
 image = image.mapim(m)
 
-image.write_to_file("./output_pyvips.jpg")
+image.write_to_file(sys.argv[3])

package.json

@@ -0,0 +1,24 @@
+{
+  "name": "perspective-shift",
+  "version": "0.1.0",
+  "description": "Shift perspective of an image using four-point perspective transform in python, vips ",
+  "main": "lib/index.js",
+  "scripts": {
+    "build": "tsc",
+    "watch": "npm run build -- --watch",
+    "install": "npm run build",
+    "prepare": "npm run build"
+  },
+  "types": "./@types",
+  "dependencies": {
+    "abortable-promise": "git+https://git.kuba-orlik.name/kuba/abortable-promises.git#3d13153",
+    "async-spawner": "git+https://git.kuba-orlik.name/kuba/async-spawner.git#a3d1a2bc27a3",
+    "tempy": "^1.0.1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://git.kuba-orlik.name/kuba/perspective-shift.git"
+  },
+  "author": "",
+  "license": "ISC"
+}

src/index.ts

@@ -0,0 +1,23 @@
+import { resolve } from "path";
+import AbortablePromise from "abortable-promise";
+import { deferedSpawn } from "async-spawner";
+import tempy from "tempy";
+
+export default function perspectiveShift(
+  source_image: string,
+  reverse_transform_parameters: number[],
+  output_image: string = tempy.file({ extension: "jpg" })
+): AbortablePromise<any> {
+  return new AbortablePromise(async function* (await_or_abort) {
+    const def = await deferedSpawn("python", [
+      resolve(__dirname, "../main.py"),
+      source_image,
+      reverse_transform_parameters.join(","),
+      output_image,
+    ]);
+    yield;
+    return await_or_abort(def.waitForAnswer(), () => {
+      def.kill();
+    });
+  });
+}

tsconfig.json

@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "noImplicitAny": true,
+    "noImplicitThis": true,
+    "strictNullChecks": true,
+    "target": "ES2019",
+    "declaration": true,
+    "esModuleInterop": true,
+    "lib": ["es6", "esnext"],
+    "outDir": "lib",
+    "checkJs": true,
+    "allowJs": true,
+    "declarationDir": "@types",
+    "sourceMap": true
+  },
+  "include": ["src/**/*"]
+}