gtk/testsuite/gsk/compare/offscreen-pixel-alignment2.node

/* generate the outline, and ensure the bounds are set */
color {
  bounds: 0 0 15 15;
  color: black;
}

/* scale by 1.5 to get into fractional scaling mode */
transform {
  transform: scale(1.5);
  /* Use opacity node to get an offscreen
     (also makes Cairo not round pixel values wrong) */
  child: opacity {
    opacity: 0.4;
    /* We use a container with overlapping children here
       to force the offscreen */
    child: container {
      /* This color node is not pixel-aligned with
         the pixel grid - it's at (1.5, 1.5) in pixel coords.

         So the offscreen needs to account for this
         and ensure to grow larger than the bounds
         if it wants to keep the pixel grid.

         We use the same color as the background above,
         so that we don't get comparison artifacts
         when blending. */
      color {
        color: black;
        bounds: 1 1 8 8;
      }
      /* This color node is aligned with the pixel grid -
         It's at (3, 3) in pixel coords.

         But it's drawn to an offscreen first, so if the
         offscreen is not pixel-aligned, this boundary
         will be blurry.
         ^^^
         THIS IS WHAT THE WHOLE TEST IS ABOUT! */
      color {
        color: red;
        bounds: 2 2 6 6;
      }
    }
  }
}