javascriptjquerycsspixelate

Image with fixed width to fill div

I have a question, I have an image which I want after some jquery event pixelizate. I dont want to use pixelate.js or other plugins, they are not good for my project.

What I want, automatically change image to a smaller "copy" of the same picture with css image-rendering: pixelated but without second copy of image. It is possible with CSS/javascript?

Sorry for my bad english and thanks!

Solution

  • You can do this with HTML5's canvas element. Essentially, we want to take our image, draw it to a small canvas, and then stretch the canvas to fill the original image size. Here's an example:

    $('.image-container').each(function() {
  var canvas = $(this).children('canvas').get(0),
      ctx = canvas.getContext('2d'),
      image = $(this).children('img').get(0),
      imageWidth = $(image).width(),
      imageHeight = $(image).height(),
      scaleFactor = 0.05;
  
  canvas.width = scaleFactor * imageWidth;
  canvas.height = scaleFactor * imageHeight;
  ctx.drawImage(image, 0, 0, canvas.width, canvas.height);

  $(canvas).width(imageWidth);
  $(canvas).height(imageWidth);
});

$('#toggle-pixelization').on('click', function() {
  $('.image-container').children().toggleClass('hidden')
});
    .hidden {
  display: none;
}

.image-container canvas {
  image-rendering: -moz-crisp-edges;
  image-rendering:   -o-crisp-edges;
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
  -ms-interpolation-mode: nearest-neighbor;
}
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<div class="image-container">
  <img src="https://placekitten.com/150/150" />
  <canvas class="hidden"></canvas>
</div>
<button id="toggle-pixelization">Toggle Pixelization</button>