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Pixel difference uses CSS mix-blend-mode, which is supported currently
only on Firefox >= 32 and on Safari >= 7.1. Implementation is behind a
Javascript feature test.
For other browsers, there's a blink comparator.
Code changes:
* ImageDiffHandler now takes the page it's used on as argument. We need
that to get labels. DOM generated is a
little bit different (new controls).
* Diff pages adapted to new constructor of ImageDiffHandler.
* CSS and Javascript changes implementing the new controls, making use
of two new static image resources. Since I felt that the new controls
deserved tooltips, I also gave the opacity slider a tooltip: changed
to <a>, and slider handle changed from <div> to <span>. CSS ensures
everything still displays the same (basically display:inline-block).
* Supplied messages for English, French, and German for the new
tooltips.
Tested on IE8, Safari 6.1.6 & 7.1, Chrome 38, FF 33.1 & FF 3.6.13
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This works better for small images. The previous CSS-resize based
attempt worked reasonably well, but had two problems on WebKit
(Safari):
1. For very small images the red resize handle would overlap the image
itself. In that case, the image became un-draggable as soon as the
opacity was reduced below 1.0.
2. Safari apparently doesn't send mousemove events during a CSS
resize, so the opacity was changed only on mouseup.
Both observed on Safari 6.1.6 and 7.1. FF 33.1 had no problems.
Therefore I've switched to a Javascript slider. Since I didn't find
any that was simple, did not require HTML 5, appeared to be well
maintained, had a bug tracker and not too many outstanding bug reports,
didn't pull in umpteen other dependencies, didn't suffer from feature
bloat, was compatible with jQuery 1.7.1, and was freely licensed, I
ended up writing my own.
imgdiff.js contains a small Javascript slider (only horizontal) that is
styled completely in CSS. It reports ratios in the range [0..1] and
fires nice jQuery events 'slider:pos' on value changes. Base element
is a plain div that is positioned. It's not a general-purpose do-it-all
slider, but it's small, simple, and works for what we need it.
(imgdiff.js also sets up the ese sliders on the diff pages.)
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Using the browser's built-in slider doesn't work if the browser hides
scrollbars (like Firefox on Mac). So,construct our own slider with
three divs and some CSS. Event-handling Javascript changed to match
this new implementation.
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* ImageDiffHandler adds the slider; styled in gitblit.css
* imgdiff.js is a little bottom-loaded Javascript that adjusts the
opacity on sliders' scroll events.
* The three diff pages add this bottom script to the page if needed
* GitBlitDiffFormatter: center image diffs.
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Ticket 88: https://dev.gitblit.com/tickets/gitblit.git/88
Based on Lea Verou's pure CSS slider:
http://lea.verou.me/2014/07/image-comparison-slider-with-pure-css/
* Add a callback interface, pass it through DiffUtils to the
GitBlitDiffFormatter. Is needed because the rendering needs access
to the repositoryName and other things that are known only at higher
levels.
* New class ImageDiffHandler responsible for rendering an image diff.
Called for all binary diffs, doesn't do anything if it's not an
image. HTML is generated via JSoup: no worries about forgetting to
close a tag, not about HTML escaping, nor about XSS.
* The 3 diff pages set up such an ImageDIffHandler and pass it along.
* CSS changes: from Lea Verou, with some minor improvements.
I think in the long run there'll be no way around rewriting the
HTML diff formatter from scratch, not using the standard JGit
DiffFormatter at all.
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