A set of fixes to keep resized image state properly

[zaak]

There was a few issues related to keeping image state after any of the resizing tranformations (like resize, crop, rotate). The revert method worked improperly in this case, applying only one transformation on original pixel data. This logic failed if image was modified more that once (for example crop, then rotate, then resize etc).
What I did was just simply adding an additional canvas especially for rendering. Resized image state is kept by an internal canvas (with all modifications like crop, resize, rotate, but without any filters applied), so there are always "fresh" pixels ready for use in revert. The second canvas (visible one) is used for rendering - it takes image from first canvas and applies filters/presets to create the final image.

Also merged plugins submodule, updated conflicting node packages and fixed build scripts for travis.

Small demo: http://zaak.github.io/CamanJS-demo/

[EmanH]

You're a legend mate! Thank you so much.

[av01d]

It seems that the revert function is broken after this patch? I'm using caman.full.js from this patch.
Calling revert results in a blank canvas.
If I fetch caman.full.min.js from the demo on http://zaak.github.io/CamanJS-demo/ (http://zaak.github.io/CamanJS-demo/caman.full.min.js), revert works. Unfortunately, only the minified version seems to be available here.
If I use https://raw.githubusercontent.com/meltingice/CamanJS/1ac3fb607da642597b02e6e0e4f875e111b27324/dist/caman.full.js or https://raw.githubusercontent.com/meltingice/CamanJS/1ac3fb607da642597b02e6e0e4f875e111b27324/dist/caman.full.min.js, revert is broken as described above.
Would @zaak be so kind to share his latest caman.full.js (unminified) with me (and others)?
Thank you so much!!!

[av01d]

@zaak It would be such a great christmas present... sharing caman.full.js with the fixes to keep resized image state properly with all of us. Please?
Thanks Santa!

[zaak]

Hey @av01d. Sorry, I didn't notice your previous message.
Here's a fork with all the fixes that we use for CKFinder purposes, have a look here. 🎅

[av01d]

Thanks @zaak for this nice christmas gift ;-)
Unfortunately, your caman.full.js (https://raw.githubusercontent.com/ckfinder/CamanJS/master/dist/caman.full.js) still has the same bug: revert does not work, it causes an empty canvas.
I'll try to create something myself.

[av01d]

As for the non-working revert: I finally figured it out, I was doing something wrong. I applied a filter like so:

Caman('#filterImg', function() {
   this.sepia(40);
   this.render();
});

And when I wanted to revert that filter:

Caman('#filterImg', function() {
   this.revert();
});

This last call calls the Caman constructor again, re-initializing the image in #filterImg.
The weird thing is that this did work with the original caman.full.js.

The correct approach (for both the original caman.full.js and the version made by @zaak) is this:

var caman = Caman('#filterImg', function() {
   caman.greyscale();
   caman.render();
});

And if you want to revert a filter, do this:

caman.revert();

You now have only 1 Caman instance, its constructor is called only once and everything works!