| <!DOCTYPE html> |
| <html> |
| <body> |
| <div> |
| <canvas width="100" height="100" class="small-canvas" id="canvas-1"></canvas> |
| <canvas width="100" height="100" class="small-canvas" id="canvas-2"></canvas> |
| <canvas width="100" height="100" class="small-canvas" id="canvas-3"></canvas> |
| </div> |
| <div> |
| <canvas width="200" height="200" class="large-canvas" id="canvas-a"></canvas> |
| <canvas width="200" height="200" class="large-canvas" id="canvas-b"></canvas> |
| <canvas width="200" height="200" class="large-canvas" id="canvas-c"></canvas> |
| </div> |
| <script> |
| function drawFrame(image, canvasIds) { |
| return new Promise((resolve) => { |
| var newCanvasIds = []; |
| for (canvasId of canvasIds) { |
| let canvas = document.getElementById("canvas-" + canvasId); |
| let context = canvas.getContext("2d"); |
| context.drawImage(image, 0, 0, 100, 100, 0, 0, canvas.width, canvas.height); |
| newCanvasIds.push(String.fromCharCode(canvasId.charCodeAt() + 1)) |
| } |
| |
| if (window.internals) { |
| image.addEventListener("webkitImageFrameReady", function() { |
| resolve(newCanvasIds); |
| }, false); |
| } else { |
| setTimeout(() => { |
| resolve(newCanvasIds); |
| }, 40); |
| } |
| }); |
| } |
| |
| function drawImage(image, canvasIds, frameCount) { |
| let promise = drawFrame(image, canvasIds); |
| for (let frame = 1; frame < frameCount; ++frame) { |
| promise = promise.then((canvasIds) => { |
| return drawFrame(image, canvasIds); |
| }); |
| } |
| return promise; |
| } |
| |
| function loadImage(image, src, canvasIds, frameCount) { |
| return new Promise((resolve) => { |
| image.onload = (() => { |
| if (window.internals) { |
| internals.setImageFrameDecodingDuration(image, 0.030); |
| internals.settings.setAnimatedImageDebugCanvasDrawingEnabled(true); |
| internals.settings.setWebkitImageReadyEventEnabled(true); |
| } |
| drawImage(image, canvasIds, frameCount).then(resolve); |
| }); |
| image.src = src; |
| }); |
| } |
| |
| (function() { |
| if (window.internals) |
| internals.clearMemoryCache(); |
| |
| if (window.testRunner) |
| testRunner.waitUntilDone(); |
| |
| var image = new Image; |
| document.body.appendChild(image); |
| |
| var promise = loadImage(image, "resources/animated-red-green-blue.gif", ['1', 'a'], 3); |
| |
| promise.then(() => { |
| image.remove(); |
| if (window.testRunner) |
| testRunner.notifyDone(); |
| }); |
| })(); |
| </script> |
| </body> |
| </html> |
