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//"use strict";
// Utilities for browser environments
mergeInto(LibraryManager.library, {
emscripten_set_main_loop: function(func, fps) {
fps = fps || 60; // TODO: use requestAnimationFrame
_emscripten_set_main_loop.cancel = false;
var jsFunc = FUNCTION_TABLE[func];
function doOne() {
if (_emscripten_set_main_loop.cancel) return;
jsFunc();
setTimeout(doOne, 1000/fps); // doing this each time means that on exception, we stop
}
setTimeout(doOne, 1000/fps);
},
emscripten_cancel_main_loop: function(func) {
_emscripten_set_main_loop.cancel = true;
},
$Browser: {
// Given binary data for an image, in a format like PNG or JPG, we convert it
// to flat pixel data. We do so using the browser's native code.
// This is deprecated, it is preferred to load binary files, createObjectURL, etc.,
// see the sdl_* tests.
decodeImage: function(pixels, format) {
function encodeBase64(data) {
var BASE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
var PAD = '=';
var ret = '';
var leftchar = 0;
var leftbits = 0;
for (var i = 0; i < data.length; i++) {
leftchar = (leftchar << 8) | data[i];
leftbits += 8;
while (leftbits >= 6) {
var curr = (leftchar >> (leftbits-6)) & 0x3f;
leftbits -= 6;
ret += BASE[curr];
}
}
if (leftbits == 2) {
ret += BASE[(leftchar&3) << 4];
ret += PAD + PAD;
} else if (leftbits == 4) {
ret += BASE[(leftchar&0xf) << 2];
ret += PAD;
}
return ret;
}
var image = new Image();
image.src = 'data:image/' + format + ';base64,' + encodeBase64(pixels);
assert(image.complete, 'Image could not be decoded'); // page reload might fix it, decoding is async... need .onload handler...
var canvas = document.createElement('canvas');
canvas.width = image.width;
canvas.height = image.height;
var ctx = canvas.getContext('2d');
ctx.drawImage(image, 0, 0);
var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
return imageData;
},
}
});
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