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anim.js
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143 lines (121 loc) · 3.79 KB
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(function(exports) {
"use strict";
var delay_scale = 150;
var timer = null;
var animate = function(img, timeline, element, ratio) {
var run_time = 0,
i = 0,
j;
for (j = 0; j < timeline.length - 1; ++j) {
run_time += timeline[j].delay;
}
var f = function() {
var frame = i++ % timeline.length,
delay = timeline[frame].delay * delay_scale,
blits = timeline[frame].blit,
ctx = element.getContext('2d');
for (j = 0; j < blits.length; ++j) {
var blit = blits[j],
sx = blit[0] * ratio,
sy = blit[1] * ratio,
w = blit[2] * ratio,
h = blit[3] * ratio,
dx = blit[4] * ratio,
dy = blit[5] * ratio;
ctx.drawImage(img, sx, sy, w, h, dx, dy, w, h);
}
timer = window.setTimeout(f, delay);
};
if (timer) window.clearTimeout(timer);
f();
};
var animate_fallback = function(img, timeline, element, ratio) {
var run_time = 0,
i = 0,
j;
for (j = 0; j < timeline.length - 1; ++j) {
run_time += timeline[j].delay;
}
var f = function() {
if (i % timeline.length === 0) {
while (element.hasChildNodes()) {
element.removeChild(element.lastChild);
}
}
var frame = i++ % timeline.length,
delay = timeline[frame].delay * delay_scale,
blits = timeline[frame].blit;
for (j = 0; j < blits.length; ++j) {
var blit = blits[j],
sx = blit[0],
sy = blit[1],
w = blit[2],
h = blit[3],
dx = blit[4],
dy = blit[5];
var d = document.createElement('div');
d.style.position = 'absolute';
d.style.left = dx + "px";
d.style.top = dy + "px";
d.style.width = w + "px";
d.style.height = h + "px";
d.style.backgroundImage = "url('" + img.src + "')";
d.style.backgroundSize = (img.width / ratio) + "px " + (img.height / ratio) + "px";
d.style.backgroundPosition = "-" + sx + "px -" + sy + "px";
element.appendChild(d);
}
timer = window.setTimeout(f, delay);
};
if (timer) window.clearTimeout(timer);
f();
};
exports.set_animation = function(img_url, timeline, canvas_id, fallback_id) {
var auto = 1,
devicePixelRatio = !auto || window.devicePixelRatio || 1,
width = timeline[0].blit[0][2],
height = timeline[0].blit[0][3],
img = new Image(),
final_img_url;
img.onload = function() {
var canvas = document.getElementById(canvas_id);
if (canvas && canvas.getContext) {
var ctx = canvas.getContext('2d'),
backingStoreRatio = !auto ||
ctx.webkitBackingStorePixelRatio ||
ctx.mozBackingStorePixelRatio ||
ctx.msBackingStorePixelRatio ||
ctx.oBackingStorePixelRatio ||
ctx.backingStorePixelRatio || 1,
ratio = devicePixelRatio / backingStoreRatio;
canvas.width = width * ratio;
canvas.height = height * ratio;
canvas.style.width = width + 'px';
canvas.style.height = height + 'px';
// ctx.scale(ratio, ratio);
animate(img, timeline, canvas, ratio);
} else {
var element = document.getElementById(fallback_id);
element.style.width = width + 'px';
element.style.height = height + 'px';
element.style.position = 'relative';
animate_fallback(img, timeline, element, devicePixelRatio);
}
};
img.onerror = function() {
if (devicePixelRatio != 1) {
devicePixelRatio = 1;
final_img_url = img_url;
auto = 0;
img.src = final_img_url;
}
};
if (devicePixelRatio != 1) {
var retinaImageSuffix = '@' + devicePixelRatio + 'x',
regexMatch = /\.\w+$/;
final_img_url = img_url.replace(regexMatch, function(match) { return retinaImageSuffix + match; });
} else {
final_img_url = img_url;
}
img.src = final_img_url;
};
})(window);