Obsolete
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
The HTMLCanvasElement.mozFetchAsStream()
internal method used to create a new input stream that, when ready, would provide the contents of the canvas as image data. However, this non-standard and internal method has been removed.
Syntax
void canvas.mozFetchAsStream(callback, type);
Parameters
callback
- An
nsIInputStreamCallback
. type
Optional- A
DOMString
indicating the image format. The default type isimage/png
.
Return value
None.
Examples
Save to disk with mozFetchAsStream
(Chrome context only)
This technique also converts it to ico, however it will not work in Windows XP as WinXP cannot convert from PNG to ICO. It saves to the desktop it uses FileUtils.jsm. Also uses NetUtil.jsm
var canvas = document.getElementById('canvas'); var d = canvas.width; ctx = canvas.getContext('2d'); ctx.beginPath(); ctx.moveTo(d / 2, 0); ctx.lineTo(d, d); ctx.lineTo(0, d); ctx.closePath(); ctx.fillStyle = 'yellow'; ctx.fill(); var netutilCallback = function() { return function(result) { if (!Components.isSuccessCode(result)) { alert('FAILED to create icon'); } else { alert('succesfully made'); } }; } var mfasCallback = function(iconName) { return function(inStream) { var file = FileUtils.getFile('Desk', [iconName + '.ico']); var outStream = FileUtils.openFileOutputStream(file); Cu.import('resource://gre/modules/NetUtil.jsm'); NetUtil.asyncCopy(inStream, outStream, netutilCallback()); } } canvas.mozFetchAsStream(mfasCallback('myIcon'), 'image/vnd.microsoft.icon');
Specifications
Not part of any specification.
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
mozFetchAsStream | Chrome No support No | Edge No support No | Firefox No support 13 — 43 | IE No support No | Opera No support No | Safari No support No | WebView Android No support No | Chrome Android No support No | Firefox Android No support No | Opera Android No support No | Safari iOS No support No | Samsung Internet Android No support No |
Legend
- No support
- No support
- Non-standard. Expect poor cross-browser support.
- Non-standard. Expect poor cross-browser support.
- Deprecated. Not for use in new websites.
- Deprecated. Not for use in new websites.
See also
- The interface defining it,
HTMLCanvasElement
.