73 lines
2.3 KiB
HTML
73 lines
2.3 KiB
HTML
<!DOCTYPE html>
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<html>
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<style>
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canvas {
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width: 100px;
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height: 100px;
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}
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</style>
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<body>
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<div>
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<p>Frames of a 3-frame animated image with infinite loopCount:</p>
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<canvas id="canvas-A"></canvas>
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<canvas id="canvas-B"></canvas>
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<canvas id="canvas-C"></canvas>
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<canvas id="canvas-D"></canvas>
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<canvas id="canvas-E"></canvas>
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<canvas id="canvas-F"></canvas>
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<canvas id="canvas-G"></canvas>
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</div>
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<script>
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function drawFrame(image, canvasId) {
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return new Promise((resolve) => {
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let canvas = document.getElementById("canvas-" + canvasId);
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let context = canvas.getContext("2d");
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context.drawImage(image, 0, 0, canvas.width, canvas.height);
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setTimeout(() => {
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resolve(String.fromCharCode(canvasId.charCodeAt() + 1));
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}, 30);
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});
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}
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function drawImage(image, canvasId, frameCount) {
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let promise = drawFrame(image, canvasId);
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for (let frame = 1; frame < frameCount; ++frame) {
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promise = promise.then((canvasId) => {
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return drawFrame(image, canvasId);
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});
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}
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return promise;
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}
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function loadImage(src, canvasId, frameCount) {
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return new Promise((resolve) => {
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let image = new Image;
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image.onload = (() => {
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drawImage(image, canvasId, frameCount).then(resolve);
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});
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image.src = src;
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});
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}
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(function() {
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if (window.internals) {
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internals.clearMemoryCache();
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internals.settings.setAnimatedImageDebugCanvasDrawingEnabled(true);
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}
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if (window.testRunner)
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testRunner.waitUntilDone();
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var imageSrc = "resources/animated-red-green-blue-repeat-infinite.gif";
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var firstCanvasId = 'A';
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var frameCount = 7;
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loadImage(imageSrc, firstCanvasId, frameCount).then(() => {
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if (window.testRunner)
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testRunner.notifyDone();
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});
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})();
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</script>
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</body>
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</html>
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