Update drawImage to create more fast paths.

tests/html/canvasrenderingcontext2d_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library canvas_rendering_context_2d_test;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:html';
 import 'dart:math';
 
@@ skipping 264 matching lines @@
       });
       img.src = dataUrl;
     });
 
     // Draw an image to the canvas from an image element and scale it.
     test('drawImage from img element with 5 params', () {
       var dataUrl = otherCanvas.toDataUrl('image/gif');
       var img = new ImageElement();
 
       img.onLoad.listen(expectAsync1((_) {
-        context.drawImageAtScale(img, new Rect(50, 50, 20, 20));
+        context.drawImageToRect(img, new Rect(50, 50, 20, 20));
 
         expectPixelFilled(50, 50);
         expectPixelFilled(55, 55);
         expectPixelFilled(59, 59);
         expectPixelFilled(60, 60);
         expectPixelFilled(69, 69);
         expectPixelUnfilled(70, 70);
         expectPixelUnfilled(0, 0);
         expectPixelUnfilled(80, 80);
       }));
       img.onError.listen((_) {
         guardAsync(() {
           fail('URL failed to load.');
         });
       });
       img.src = dataUrl;
     });
 
     // Draw an image to the canvas from an image element and scale it.
     test('drawImage from img element with 9 params', () {
       otherContext.fillStyle = "blue";
       otherContext.fillRect(5, 5, 5, 5);
       var dataUrl = otherCanvas.toDataUrl('image/gif');
       var img = new ImageElement();
 
       img.onLoad.listen(expectAsync1((_) {
         // This will take a 6x6 square from the first canvas from position 2,2
         // and then scale it to a 20x20 square and place it to the second canvas
         // at 50,50.
-        context.drawImageAtScale(img, new Rect(50, 50, 20, 20),
+        context.drawImageToRect(img, new Rect(50, 50, 20, 20),
           sourceRect: new Rect(2, 2, 6, 6));
 
         checkPixel(readPixel(50, 50), [255, 0, 0, 255]);
         checkPixel(readPixel(55, 55), [255, 0, 0, 255]);
         checkPixel(readPixel(60, 50), [255, 0, 0, 255]);
         checkPixel(readPixel(65, 65), [0, 0, 255, 255]);
         checkPixel(readPixel(69, 69), [0, 0, 255, 255]);
 
         expectPixelFilled(50, 50);
         expectPixelFilled(55, 55);
@@ skipping 91 matching lines @@
 //        video.src = mp4VideoUrl;
 //      } else {
 //        logMessage('Video is not supported on this system.');
 //      }
 //    });
 //
 //    test('drawImage from video element with 5 params', () {
 //      var video = new VideoElement();
 //
 //      video.onLoadedData.listen(expectAsync1((_) {
-//        context.drawImageAtScale(video, new Rect(50, 50, 20, 20));
+//        context.drawImageToRect(video, new Rect(50, 50, 20, 20));
 //
 //        expectPixelFilled(50, 50);
 //        expectPixelFilled(55, 55);
 //        expectPixelFilled(59, 59);
 //        expectPixelFilled(60, 60);
 //        expectPixelFilled(69, 69);
 //        expectPixelUnfilled(70, 70);
 //        expectPixelUnfilled(0, 0);
 //        expectPixelUnfilled(80, 80);
 //      }));
@@ skipping 11 matching lines @@
 //      } else {
 //        // TODO(amouravski): Better fallback?
 //        logMessage('Video is not supported on this system.');
 //      }
 //    });
 //
 //    test('drawImage from video element with 9 params', () {
 //      var video = new VideoElement();
 //
 //      video.onLoadedData.listen(expectAsync1((_) {
-//        context.drawImageAtScale(video, new Rect(50, 50, 20, 20),
+//        context.drawImageToRect(video, new Rect(50, 50, 20, 20),
 //          sourceRect: new Rect(2, 2, 6, 6));
 //
 //        expectPixelFilled(50, 50);
 //        expectPixelFilled(55, 55);
 //        expectPixelFilled(59, 59);
 //        expectPixelFilled(60, 60);
 //        expectPixelFilled(69, 69);
 //        expectPixelUnfilled(70, 70);
 //        expectPixelUnfilled(0, 0);
 //        expectPixelUnfilled(80, 80);
@@ skipping 21 matching lines @@
 
       expectPixelFilled(50, 50);
       expectPixelFilled(55, 55);
       expectPixelFilled(59, 59);
       expectPixelUnfilled(60, 60);
       expectPixelUnfilled(0, 0);
       expectPixelUnfilled(70, 70);
     });
     test('drawImage from canvas element with 5 params', () {
       // Draw an image to the canvas from a canvas element.
-      context.drawImageAtScale(otherCanvas, new Rect(50, 50, 20, 20));
+      context.drawImageToRect(otherCanvas, new Rect(50, 50, 20, 20));
 
       expectPixelFilled(50, 50);
       expectPixelFilled(55, 55);
       expectPixelFilled(59, 59);
       expectPixelFilled(60, 60);
       expectPixelFilled(69, 69);
       expectPixelUnfilled(70, 70);
       expectPixelUnfilled(0, 0);
       expectPixelUnfilled(80, 80);
     });
     test('drawImage from canvas element with 9 params', () {
       // Draw an image to the canvas from a canvas element.
       otherContext.fillStyle = "blue";
       otherContext.fillRect(5, 5, 5, 5);
-      context.drawImageAtScale(otherCanvas, new Rect(50, 50, 20, 20),
+      context.drawImageToRect(otherCanvas, new Rect(50, 50, 20, 20),
           sourceRect: new Rect(2, 2, 6, 6));
 
       checkPixel(readPixel(50, 50), [255, 0, 0, 255]);
       checkPixel(readPixel(55, 55), [255, 0, 0, 255]);
       checkPixel(readPixel(60, 50), [255, 0, 0, 255]);
       checkPixel(readPixel(65, 65), [0, 0, 255, 255]);
       checkPixel(readPixel(69, 69), [0, 0, 255, 255]);
       expectPixelFilled(50, 50);
       expectPixelFilled(55, 55);
       expectPixelFilled(59, 59);
       expectPixelFilled(60, 60);
       expectPixelFilled(69, 69);
       expectPixelUnfilled(70, 70);
       expectPixelUnfilled(0, 0);
       expectPixelUnfilled(80, 80);
     });
   });
 }