|
| 1 | +function makeCanvas() { |
| 2 | + return new Promise(resolve => { |
| 3 | + var testCanvas = document.createElement("canvas"); |
| 4 | + testCanvas.width = 20; |
| 5 | + testCanvas.height = 20; |
| 6 | + var testCtx = testCanvas.getContext("2d"); |
| 7 | + testCtx.fillStyle = "rgb(255, 0, 0)"; |
| 8 | + testCtx.fillRect(0, 0, 10, 10); |
| 9 | + testCtx.fillStyle = "rgb(0, 255, 0)"; |
| 10 | + testCtx.fillRect(10, 0, 10, 10); |
| 11 | + testCtx.fillStyle = "rgb(0, 0, 255)"; |
| 12 | + testCtx.fillRect(0, 10, 10, 10); |
| 13 | + testCtx.fillStyle = "rgb(0, 0, 0)"; |
| 14 | + testCtx.fillRect(10, 10, 10, 10); |
| 15 | + resolve(testCanvas); |
| 16 | + }); |
| 17 | +} |
| 18 | + |
| 19 | +function makeOffscreenCanvas() { |
| 20 | + return new Promise(resolve => { |
| 21 | + let canvas = new OffscreenCanvas(20, 20); |
| 22 | + var testCtx = canvas.getContext("2d"); |
| 23 | + testCtx.fillStyle = "rgb(255, 0, 0)"; |
| 24 | + testCtx.fillRect(0, 0, 10, 10); |
| 25 | + testCtx.fillStyle = "rgb(0, 255, 0)"; |
| 26 | + testCtx.fillRect(10, 0, 10, 10); |
| 27 | + testCtx.fillStyle = "rgb(0, 0, 255)"; |
| 28 | + testCtx.fillRect(0, 10, 10, 10); |
| 29 | + testCtx.fillStyle = "rgb(0, 0, 0)"; |
| 30 | + testCtx.fillRect(10, 10, 10, 10); |
| 31 | + resolve(canvas); |
| 32 | + }); |
| 33 | +} |
| 34 | + |
| 35 | +function makeMakeVideo(src) { |
| 36 | + return function () { |
| 37 | + return new Promise(function(resolve, reject) { |
| 38 | + var video = document.createElement("video"); |
| 39 | + video.oncanplaythrough = function() { |
| 40 | + resolve(video); |
| 41 | + }; |
| 42 | + video.onerror = reject; |
| 43 | + |
| 44 | + // preload=auto is required to ensure a frame is available once |
| 45 | + // canplaythrough is fired. The default of preload=metadata does not |
| 46 | + // gaurantee this. |
| 47 | + video.preload = "auto"; |
| 48 | + video.src = getVideoURI(src); |
| 49 | + |
| 50 | + // Prevent WebKit from garbage collecting event handlers. |
| 51 | + window._video = video; |
| 52 | + }); |
| 53 | + } |
| 54 | +} |
| 55 | + |
| 56 | +function makeVideo() { |
| 57 | + return makeMakeVideo("../../../../../images/pattern")(); |
| 58 | +} |
| 59 | + |
| 60 | +var imageBitmapDataUrlVideoPromise = self.GLOBAL && self.GLOBAL.isWorker() |
| 61 | + // /common/media.js can't load in a Worker so we don't have getVideoURI |
| 62 | + ? null |
| 63 | + : fetch(getVideoURI("../../../../../images/pattern")) |
| 64 | + .then(response => Promise.all([response.headers.get("Content-Type"), response.arrayBuffer()])) |
| 65 | + .then(([type, data]) => { |
| 66 | + return new Promise(function(resolve, reject) { |
| 67 | + var video = document.createElement("video"); |
| 68 | + video.oncanplaythrough = function() { |
| 69 | + resolve(video); |
| 70 | + }; |
| 71 | + video.onerror = reject; |
| 72 | + |
| 73 | + var encoded = btoa(String.fromCodePoint(...new Uint8Array(data))); |
| 74 | + var dataUrl = `data:${type};base64,${encoded}`; |
| 75 | + |
| 76 | + // preload=auto is required to ensure a frame is available once |
| 77 | + // canplaythrough is fired. The default of preload=metadata does not |
| 78 | + // gaurantee this. |
| 79 | + video.preload = "auto"; |
| 80 | + video.src = dataUrl; |
| 81 | + |
| 82 | + // Prevent WebKit from garbage collecting event handlers. |
| 83 | + window._dataVideo = video; |
| 84 | + }); |
| 85 | + }); |
| 86 | + |
| 87 | +function makeDataUrlVideo() { |
| 88 | + return imageBitmapDataUrlVideoPromise; |
| 89 | +} |
| 90 | + |
| 91 | +function makeMakeHTMLImage(src) { |
| 92 | + return function() { |
| 93 | + return new Promise((resolve, reject) => { |
| 94 | + var img = new Image(); |
| 95 | + img.onload = function() { |
| 96 | + resolve(img); |
| 97 | + }; |
| 98 | + img.onerror = reject; |
| 99 | + img.src = src; |
| 100 | + }); |
| 101 | + } |
| 102 | +} |
| 103 | + |
| 104 | +function makeMakeSVGImage(src) { |
| 105 | + return function() { |
| 106 | + return new Promise((resolve, reject) => { |
| 107 | + var image = document.createElementNS("http://www.w3.org/2000/svg", "image"); |
| 108 | + image.onload = () => resolve(image); |
| 109 | + image.onerror = reject; |
| 110 | + image.setAttribute("externalResourcesRequired", "true"); |
| 111 | + image.setAttributeNS("http://www.w3.org/1999/xlink", 'xlink:href', src); |
| 112 | + document.body.appendChild(image); |
| 113 | + }); |
| 114 | + } |
| 115 | +} |
| 116 | + |
| 117 | +function makeImageData() { |
| 118 | + return new Promise(function(resolve, reject) { |
| 119 | + var width = 20, height = 20; |
| 120 | + var imgData = new ImageData(width, height); |
| 121 | + for (var i = 0; i < width * height * 4; i += 4) { |
| 122 | + imgData.data[i] = 0; |
| 123 | + imgData.data[i + 1] = 0; |
| 124 | + imgData.data[i + 2] = 0; |
| 125 | + imgData.data[i + 3] = 255; //alpha channel: 255 |
| 126 | + } |
| 127 | + var halfWidth = width / 2; |
| 128 | + var halfHeight = height / 2; |
| 129 | + // initialize to R, G, B, Black, with each one 10*10 pixels |
| 130 | + for (var i = 0; i < halfHeight; i++) |
| 131 | + for (var j = 0; j < halfWidth; j++) |
| 132 | + imgData.data[i * width * 4 + j * 4] = 255; |
| 133 | + for (var i = 0; i < halfHeight; i++) |
| 134 | + for (var j = halfWidth; j < width; j++) |
| 135 | + imgData.data[i * width * 4 + j * 4 + 1] = 255; |
| 136 | + for (var i = halfHeight; i < height; i++) |
| 137 | + for (var j = 0; j < halfWidth; j++) |
| 138 | + imgData.data[i * width * 4 + j * 4 + 2] = 255; |
| 139 | + resolve(imgData); |
| 140 | + }); |
| 141 | +} |
| 142 | + |
| 143 | +function makeImageBitmap() { |
| 144 | + return makeCanvas().then(canvas => { |
| 145 | + return createImageBitmap(canvas); |
| 146 | + }); |
| 147 | +} |
| 148 | + |
| 149 | +function makeBlob(src) { |
| 150 | + return function () { |
| 151 | + return new Promise(function(resolve, reject) { |
| 152 | + var xhr = new XMLHttpRequest(); |
| 153 | + xhr.open("GET", src); |
| 154 | + xhr.responseType = 'blob'; |
| 155 | + xhr.send(); |
| 156 | + xhr.onload = function() { |
| 157 | + resolve(xhr.response); |
| 158 | + }; |
| 159 | + }); |
| 160 | + } |
| 161 | +} |
| 162 | + |
| 163 | +var imageSourceTypes = [ |
| 164 | + { name: 'an HTMLCanvasElement', factory: makeCanvas }, |
| 165 | + { name: 'an HTMLVideoElement', factory: makeVideo }, |
| 166 | + { name: 'an HTMLVideoElement from a data URL', factory: makeDataUrlVideo }, |
| 167 | + { name: 'a bitmap HTMLImageElement', factory: makeMakeHTMLImage("../../../../../images/pattern.png") }, |
| 168 | + { name: 'a vector HTMLImageElement', factory: makeMakeHTMLImage("../../../../../images/pattern.svg") }, |
| 169 | + { name: 'a bitmap SVGImageElement', factory: makeMakeSVGImage("../../../../../images/pattern.png") }, |
| 170 | + { name: 'a vector SVGImageElement', factory: makeMakeSVGImage("../../../../../images/pattern.svg") }, |
| 171 | + { name: 'an OffscreenCanvas', factory: makeOffscreenCanvas }, |
| 172 | + { name: 'an ImageData', factory: makeImageData }, |
| 173 | + { name: 'an ImageBitmap', factory: makeImageBitmap }, |
| 174 | + { name: 'a Blob', factory: makeBlob("../../../../../images/pattern.png") }, |
| 175 | +]; |
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