Add Hq{2,3,4}x (#624)

* Scaling works on native

* It works in wasm

* Integrate with UI

* Remove benchmark

* Integrate Hqx into Resizer module

* Link against repo for hqx

* Remove unused defaultOpts

* Re-add test file

* Adding size dropdown

* Chrome: go and sit on the naughty step

* Better docs

* Review

* Add link to crbug

* Update src/codecs/processor-worker/index.ts

Co-Authored-By: Jake Archibald <jaffathecake@gmail.com>

* Terminate worker inbetween resize jobs

codecs/hqx/pkg/squooshhqx.js

@@ -0,0 +1,97 @@
+(function() {
+    const __exports = {};
+    let wasm;
+
+    let cachegetUint32Memory = null;
+    function getUint32Memory() {
+        if (cachegetUint32Memory === null || cachegetUint32Memory.buffer !== wasm.memory.buffer) {
+            cachegetUint32Memory = new Uint32Array(wasm.memory.buffer);
+        }
+        return cachegetUint32Memory;
+    }
+
+    let WASM_VECTOR_LEN = 0;
+
+    function passArray32ToWasm(arg) {
+        const ptr = wasm.__wbindgen_malloc(arg.length * 4);
+        getUint32Memory().set(arg, ptr / 4);
+        WASM_VECTOR_LEN = arg.length;
+        return ptr;
+    }
+
+    function getArrayU32FromWasm(ptr, len) {
+        return getUint32Memory().subarray(ptr / 4, ptr / 4 + len);
+    }
+
+    let cachedGlobalArgumentPtr = null;
+    function globalArgumentPtr() {
+        if (cachedGlobalArgumentPtr === null) {
+            cachedGlobalArgumentPtr = wasm.__wbindgen_global_argument_ptr();
+        }
+        return cachedGlobalArgumentPtr;
+    }
+    /**
+    * @param {Uint32Array} input_image
+    * @param {number} input_width
+    * @param {number} input_height
+    * @param {number} factor
+    * @returns {Uint32Array}
+    */
+    __exports.resize = function(input_image, input_width, input_height, factor) {
+        const ptr0 = passArray32ToWasm(input_image);
+        const len0 = WASM_VECTOR_LEN;
+        const retptr = globalArgumentPtr();
+        wasm.resize(retptr, ptr0, len0, input_width, input_height, factor);
+        const mem = getUint32Memory();
+        const rustptr = mem[retptr / 4];
+        const rustlen = mem[retptr / 4 + 1];
+
+        const realRet = getArrayU32FromWasm(rustptr, rustlen).slice();
+        wasm.__wbindgen_free(rustptr, rustlen * 4);
+        return realRet;
+
+    };
+
+    function init(module) {
+
+        let result;
+        const imports = {};
+
+        if (module instanceof URL || typeof module === 'string' || module instanceof Request) {
+
+            const response = fetch(module);
+            if (typeof WebAssembly.instantiateStreaming === 'function') {
+                result = WebAssembly.instantiateStreaming(response, imports)
+                .catch(e => {
+                    console.warn("`WebAssembly.instantiateStreaming` failed. Assuming this is because your server does not serve wasm with `application/wasm` MIME type. Falling back to `WebAssembly.instantiate` which is slower. Original error:\n", e);
+                    return response
+                    .then(r => r.arrayBuffer())
+                    .then(bytes => WebAssembly.instantiate(bytes, imports));
+                });
+            } else {
+                result = response
+                .then(r => r.arrayBuffer())
+                .then(bytes => WebAssembly.instantiate(bytes, imports));
+            }
+        } else {
+
+            result = WebAssembly.instantiate(module, imports)
+            .then(result => {
+                if (result instanceof WebAssembly.Instance) {
+                    return { instance: result, module };
+                } else {
+                    return result;
+                }
+            });
+        }
+        return result.then(({instance, module}) => {
+            wasm = instance.exports;
+            init.__wbindgen_wasm_module = module;
+
+            return wasm;
+        });
+    }
+
+    self.wasm_bindgen = Object.assign(init, __exports);
+
+})();