HTML5 How to save screenshot of HTML5 Canvas?

[rbfraphael]

Hi

Recently, I need to make some web apps and games that needs to save an image on device. I'm using GameMaker 1.4 and it's doesn't have a function to do it. So, I'm trying to find "out of box" solutions for this problem (using JavaScript).

I used the Canvas2Image library and toDataURL function, but won't worked correctly :\

Someone can help me about this?

Thnx

 

[YellowAfterlife]

Someone asked about this a few weeks ago and I made this extension. Works 100% if WebGL is disabled, does not work on select machines if WebGL is enabled - screenshots comes out blank (GPU-specific?).

 

[chmod777]

Someone asked about this a few weeks ago and I made this extension. Works 100% if WebGL is disabled, does not work on select machines if WebGL is enabled - screenshots comes out blank (GPU-specific?).

Very useful, thanks.
About WebGL I don't know if there is anything that can be done. I've read that the preserveDrawingBuffer flag has to be enabled.
http://stackoverflow.com/questions/31710748/todataurl-of-webgl-canvas-returning-transparent-image

 

[YellowAfterlife]

Very useful, thanks.
About WebGL I don't know if there is anything that can be done. I've read that the preserveDrawingBuffer flag has to be enabled.
http://stackoverflow.com/questions/31710748/todataurl-of-webgl-canvas-returning-transparent-image

Indeed; Since it's only during retrieval (which is done by an internal function), it does not seem doable.by an extension, as GMS initializes WebGL before extensions execute.