Add AssemblyScript implementation

codecs/rotate/package-lock.json

@@ -0,0 +1,124 @@
+{
+  "name": "rotate",
+  "requires": true,
+  "lockfileVersion": 1,
+  "dependencies": {
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+      "dev": true
+    },
+    "assemblyscript": {
+      "version": "github:AssemblyScript/assemblyscript#54b02c287c4d42092e4b01cc5d11bce1a53e9fb2",
+      "from": "github:AssemblyScript/assemblyscript",
+      "dev": true,
+      "requires": {
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+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
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+      "requires": {
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+        "concat-map": "0.0.1"
+      }
+    },
+    "concat-map": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
+      "dev": true
+    },
+    "fs.realpath": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
+      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
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+      "dev": true,
+      "requires": {
+        "fs.realpath": "^1.0.0",
+        "inflight": "^1.0.4",
+        "inherits": "2",
+        "minimatch": "^3.0.4",
+        "once": "^1.3.0",
+        "path-is-absolute": "^1.0.0"
+      }
+    },
+    "inflight": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/inflight/-/inflight-1.0.6.tgz",
+      "integrity": "sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=",
+      "dev": true,
+      "requires": {
+        "once": "^1.3.0",
+        "wrappy": "1"
+      }
+    },
+    "inherits": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
+      "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
+      "dev": true
+    },
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+    "minimatch": {
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+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
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+      "dev": true,
+      "requires": {
+        "brace-expansion": "^1.1.7"
+      }
+    },
+    "once": {
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+      "dev": true,
+      "requires": {
+        "wrappy": "1"
+      }
+    },
+    "path-is-absolute": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
+      "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
+      "dev": true
+    },
+    "wrappy": {
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+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    }
+  }
+}

codecs/rotate/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "rotate",
+  "scripts": {
+    "build": "asc rotate.ts -b rotate.wasm --validate --optimize"
+  },
+  "devDependencies": {
+    "assemblyscript": "github:AssemblyScript/assemblyscript"
+  }
+}

codecs/rotate/rotate.ts

@@ -0,0 +1,63 @@
+export function rotate(inputWidth: i32, inputHeight: i32, rotate: i32): void {
+  const bpp = 4;
+  let offset = inputWidth * inputHeight * bpp;
+  let i = 0;
+
+  // In the straight-copy case, d1 is x, d2 is y.
+  // x starts at 0 and increases.
+  // y starts at 0 and increases.
+  let d1Start = 0;
+  let d1Limit = inputWidth;
+  let d1Advance = 1;
+  let d1Multiplier = 1;
+  let d2Start = 0;
+  let d2Limit = inputHeight;
+  let d2Advance = 1;
+  let d2Multiplier = inputWidth;
+
+  if (rotate === 90) {
+    // d1 is y, d2 is x.
+    // y starts at its max value and decreases.
+    // x starts at 0 and increases.
+    d1Start = inputHeight - 1;
+    d1Limit = inputHeight;
+    d1Advance = -1;
+    d1Multiplier = inputWidth;
+    d2Start = 0;
+    d2Limit = inputWidth;
+    d2Advance = 1;
+    d2Multiplier = 1;
+  } else if (rotate === 180) {
+    // d1 is x, d2 is y.
+    // x starts at its max and decreases.
+    // y starts at its max and decreases.
+    d1Start = inputWidth - 1;
+    d1Limit = inputWidth;
+    d1Advance = -1;
+    d1Multiplier = 1;
+    d2Start = inputHeight - 1;
+    d2Limit = inputHeight;
+    d2Advance = -1;
+    d2Multiplier = inputWidth;
+  } else if (rotate === 270) {
+    // d1 is y, d2 is x.
+    // y starts at 0 and increases.
+    // x starts at its max and decreases.
+    d1Start = 0;
+    d1Limit = inputHeight;
+    d1Advance = 1;
+    d1Multiplier = inputWidth;
+    d2Start = inputWidth - 1;
+    d2Limit = inputWidth;
+    d2Advance = -1;
+    d2Multiplier = 1;
+  }
+
+  for (let d2 = d2Start; d2 >= 0 && d2 < d2Limit; d2 += d2Advance) {
+    for (let d1 = d1Start; d1 >= 0 && d1 < d1Limit; d1 += d1Advance) {
+      let start = ((d1 * d1Multiplier) + (d2 * d2Multiplier));
+      store<u32>(offset + i, load<u32>(start));
+      i += 1;
+    }
+  }
+}

codecs/rotate/tsconfig.json

@@ -0,0 +1,6 @@
+{
+  "extends": "../node_modules/assemblyscript/std/assembly.json",
+  "include": [
+    "./**/*.ts"
+  ]
+}