| Ravi Mistry | d6cb7ae | 2019-07-24 21:36:41 +0000 | [diff] [blame] | 1 | <!DOCTYPE html> |
| 2 | <html> |
| 3 | <head> |
| 4 | <title>Lottie-Web Perf</title> |
| 5 | <meta charset="utf-8" /> |
| 6 | <meta http-equiv="X-UA-Compatible" content="IE=egde,chrome=1"> |
| 7 | <meta name="viewport" content="width=device-width, initial-scale=1.0"> |
| 8 | <script src="/res/lottie.js" type="text/javascript" charset="utf-8"></script> |
| 9 | <style type="text/css" media="screen"> |
| 10 | body { |
| 11 | margin: 0; |
| 12 | padding: 0; |
| 13 | } |
| 14 | </style> |
| 15 | </head> |
| 16 | <body> |
| 17 | <main> |
| 18 | <canvas id=canvas width=1000 height=1000 style="height: 1000px; width: 1000px;"></canvas> |
| 19 | </main> |
| 20 | <script type="text/javascript" charset="utf-8"> |
| 21 | (function () { |
| 22 | const PATH = '/res/lottie.json'; |
| 23 | const RENDERER = 'canvas'; |
| 24 | const MAX_FRAMES = 25; |
| 25 | const MAX_LOOPS = 3; |
| 26 | |
| 27 | const cvs = document.getElementById("canvas"); |
| 28 | const canvasContext = cvs.getContext('2d'); |
| 29 | |
| 30 | // Get total number of frames of the animation from the hash. |
| 31 | const hash = window.location.hash; |
| 32 | const totalFrames = hash.slice(1); |
| 33 | console.log("Lottie has " + totalFrames + "total frames"); |
| 34 | |
| 35 | // Load the animation with autoplay false. We will control which |
| 36 | // frame to seek to and then will measure performance. |
| 37 | let anim = lottie.loadAnimation({ |
| 38 | container: document.querySelector('.anim'), |
| 39 | renderer: RENDERER, |
| 40 | loop: false, |
| 41 | autoplay: false, |
| 42 | path: PATH, |
| 43 | rendererSettings: { |
| 44 | context: canvasContext, |
| 45 | scaleMode: 'noScale', |
| 46 | clearCanvas: true, |
| 47 | preserveAspectRatio:'xMidYMid meet', |
| 48 | }, |
| 49 | }); |
| 50 | |
| 51 | const t_rate = 1.0 / (MAX_FRAMES - 1); |
| 52 | let frame = 0; |
| 53 | let loop = 0; |
| 54 | const drawFrame = () => { |
| 55 | if (frame >= MAX_FRAMES) { |
| 56 | // Reached the end of one loop. |
| 57 | loop++; |
| 58 | if (loop == MAX_LOOPS) { |
| 59 | // These are global variables to talk with puppeteer. |
| 60 | window._lottieWebDone = true; |
| 61 | return; |
| 62 | } |
| 63 | // Reset frame to restart the loop. |
| 64 | frame = 0; |
| 65 | } |
| 66 | |
| 67 | let t1 = Math.max(Math.min(t_rate * frame, 1.0), 0.0); |
| 68 | let seekToFrame = totalFrames * t1; |
| 69 | if (seekToFrame >= totalFrames-1) { |
| 70 | // bodymovin player sometimes draws blank when requesting |
| 71 | // to draw the very last frame. Subtracting a small value |
| 72 | // seems to fix this and make it draw the last frame. |
| 73 | seekToFrame -= .001; |
| 74 | } |
| 75 | |
| 76 | anim.goToAndStop(seekToFrame, true /* isFrame */); |
| 77 | console.log("Used seek: " + (seekToFrame/totalFrames)); |
| 78 | frame++; |
| 79 | window.requestAnimationFrame(drawFrame); |
| 80 | }; |
| 81 | window.requestAnimationFrame(drawFrame); |
| 82 | })(); |
| 83 | </script> |
| 84 | </body> |
| 85 | </html> |