Refactored the Image module. Added image.fromUrl method. Added image-tests.

image/image.ts

@@ -0,0 +1,110 @@
+import app = require("application/application");
+import impl = require("image/image_impl");
+import promises = require("promises/promises");
+import http = require("http/http");
+
+export enum ImageFormat {
+    PNG,
+    JPEG,
+}
+
+export class Image {
+    public android: android.graphics.Bitmap;
+    public ios: UIKit.UIImage;
+
+    constructor() {
+        this.setNativeInstance(null);
+    }
+
+    public loadFromResource(name: string): boolean {
+        var nativeInstance = impl.fromResource(name);
+        this.setNativeInstance(nativeInstance);
+        return nativeInstance != null;
+    }
+
+    public loadFromFile(path: string): boolean {
+        var nativeInstance = impl.fromFile(path);
+        this.setNativeInstance(nativeInstance);
+        return (nativeInstance != null);
+    }
+
+    public loadFromData(data: any): boolean {
+        var nativeInstance = impl.fromData(data);
+        this.setNativeInstance(nativeInstance);
+        return (nativeInstance != null);
+    }
+
+    public setNativeBitmap(source: any): boolean {
+        this.setNativeInstance(source);
+        return source != null;
+    }
+
+    public saveToFile(path: string, format: ImageFormat, quality?: number): boolean {
+        return impl.saveToFile(this.getNativeInstance(), path, format, quality);
+    }
+
+    get height(): number {
+        if (this.android) {
+            return this.android.getHeight();
+        }
+        if (this.ios) {
+            return this.ios.size.height;
+        }
+
+        return NaN;
+    }
+
+    get width(): number {
+        if (this.android) {
+            return this.android.getWidth();
+        }
+        if (this.ios) {
+            return this.ios.size.width;
+        }
+
+        return NaN;
+    }
+
+    private setNativeInstance(instance: any) {
+        if (app.android) {
+            this.android = instance;
+        } else if (app.ios) {
+            this.ios = instance;
+        }
+    }
+
+    private getNativeInstance(): any {
+        if (this.android) {
+            return this.android;
+        }
+        if (this.ios) {
+            return this.ios;
+        }
+
+        return undefined;
+    }
+}
+
+export function fromResource(name: string): Image {
+    var image = new Image();
+    return image.loadFromResource(name) ? image : null;
+}
+
+export function fromFile(path: string): Image {
+    var image = new Image();
+    return image.loadFromFile(path) ? image : null;
+}
+
+export function fromData(data: any): Image {
+    var image = new Image();
+    return image.loadFromData(data) ? image : null;
+}
+
+export function fromNativeBitmap(source: any): Image {
+    var image = new Image();
+    return image.setNativeBitmap(source) ? image : null;
+}
+
+export function fromUrl(url: string): promises.Promise<Image> {
+    return http.getImage(url);
+}