Two workers & worker termination (#198)

* Refactoring codecs

* Plugging in new processor

* Fixing decorator

* MozJPEG free issue

* Better worker aborting, and terminate workers that aren't used for 10 seconds

* Better comment

* Ooops, half-typed comment

* Uncommenting problematic line

* Surma fixed it!

* Abstracting WASM initialisation

* Better comment

* Don't need this.

* Adding ticket

* noInitalRun

* Reverting MozJPEG issue demo

* Making a const for worker timeout

* Inline docs

* Bail early rather than nesting

* Addressing nits

src/codecs/resize/options.tsx

@@ -2,7 +2,7 @@ import { h, Component } from 'preact';
 import linkState from 'linkstate';
 import { bind } from '../../lib/initial-util';
 import { inputFieldValueAsNumber } from '../../lib/util';
-import { ResizeOptions } from './resize';
+import { ResizeOptions } from './processor-meta';
 
 interface Props {
   isVector: Boolean;

src/codecs/resize/processor-meta.ts

@@ -0,0 +1,26 @@
+type BitmapResizeMethods = 'browser-pixelated' | 'browser-low' | 'browser-medium' | 'browser-high';
+
+export interface ResizeOptions {
+  width: number;
+  height: number;
+  method: 'vector' | BitmapResizeMethods;
+  fitMethod: 'stretch' | 'cover';
+}
+
+export interface BitmapResizeOptions extends ResizeOptions {
+  method: BitmapResizeMethods;
+}
+
+export interface VectorResizeOptions extends ResizeOptions {
+  method: 'vector';
+}
+
+export const defaultOptions: ResizeOptions = {
+  // Width and height will always default to the image size.
+  // This is set elsewhere.
+  width: 1,
+  height: 1,
+  // This will be set to 'vector' if the input is SVG.
+  method: 'browser-high',
+  fitMethod: 'stretch',
+};

src/codecs/resize/processor.ts

@@ -1,4 +1,5 @@
 import { nativeResize, NativeResizeMethod, drawableToImageData } from '../../lib/util';
+import { BitmapResizeOptions, VectorResizeOptions } from './processor-meta';
 
 function getCoverOffsets(sw: number, sh: number, dw: number, dh: number) {
   const currentAspect = sw / sh;
@@ -46,30 +47,3 @@ export function vectorResize(data: HTMLImageElement, opts: VectorResizeOptions):
     width: opts.width, height: opts.height,
   });
 }
-
-type BitmapResizeMethods = 'browser-pixelated' | 'browser-low' | 'browser-medium' | 'browser-high';
-
-export interface ResizeOptions {
-  width: number;
-  height: number;
-  method: 'vector' | BitmapResizeMethods;
-  fitMethod: 'stretch' | 'cover';
-}
-
-export interface BitmapResizeOptions extends ResizeOptions {
-  method: BitmapResizeMethods;
-}
-
-export interface VectorResizeOptions extends ResizeOptions {
-  method: 'vector';
-}
-
-export const defaultOptions: ResizeOptions = {
-  // Width and height will always default to the image size.
-  // This is set elsewhere.
-  width: 1,
-  height: 1,
-  // This will be set to 'vector' if the input is SVG.
-  method: 'browser-high',
-  fitMethod: 'stretch',
-};