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Add blobToDataURL.

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Gerben 2017-06-03 00:26:22 +02:00 committed by Nolan Lawson
parent d413ae66f4
commit 7831bb7b0b
2 changed files with 24 additions and 3 deletions
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14
lib/index.js
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@ -193,6 +193,19 @@ function dataURLToBlob(dataURL) {
});
}
/**
* Convert a <code>Blob</code> to a data URL string
* (e.g. <code>'data:image/png;base64,iVBORw0KG...'</code>).
* Returns a Promise.
* @param {Blob} blob
* @returns {Promise} Promise that resolves with the data URL string
*/
function blobToDataURL(blob) {
return blobToBase64String(blob).then(function (base64String) {
return 'data:' + blob.type + ';base64,' + base64String;
});
}
/**
* Convert an image's <code>src</code> URL to a data URL by loading the image and painting
* it to a <code>canvas</code>. Returns a Promise.
@ -300,6 +313,7 @@ module.exports = {
imgSrcToDataURL : imgSrcToDataURL,
canvasToBlob : canvasToBlob,
dataURLToBlob : dataURLToBlob,
blobToDataURL : blobToDataURL,
blobToBase64String : blobToBase64String,
base64StringToBlob : base64StringToBlob,
binaryStringToBlob : binaryStringToBlob,

13
test/test.js
View File

@ -103,21 +103,28 @@ describe('basic tests', function () {
});
});
it('convert to dataURL', function () {
it('convert blob to data url', function () {
var blob = blobUtil.createBlob(['foo'], 'text/plain');
return blobUtil.blobToDataURL(blob).then(function (dataURL) {
dataURL.should.equal('data:text/plain;base64,Zm9v');
});
});
it('convert img to dataURL', function () {
var img = document.getElementById('transparent');
return blobUtil.imgSrcToDataURL(img.src).then(function (url) {
url.should.match(/^data:image\/png;base64/);
});
});
it('convert to dataURL 2', function () {
it('convert img to dataURL 2', function () {
var img = document.getElementById('kirby');
return blobUtil.imgSrcToDataURL(img.src).then(function (url) {
url.should.match(/^data:image\/png;base64/);
});
});
it('convert to dataURL 3', function () {
it('convert img to dataURL 3', function () {
var img = document.getElementById('kirby');
return blobUtil.imgSrcToDataURL(img.src, 'image/jpeg').then(function (url) {
url.should.match(/^data:image\/jpeg;base64/);