pdf.js/web/draw_layer_builder.css

/* Copyright 2014 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

.canvasWrapper {
  svg {
    transform: none;

    &.moving {
      z-index: 100000;
    }

    &.highlight,
    &.highlightOutline {
      &[data-main-rotation="90"] {
        mask,
        use:not(.clip, .mask) {
          transform: matrix(0, 1, -1, 0, 1, 0);
        }
      }

      &[data-main-rotation="180"] {
        mask,
        use:not(.clip, .mask) {
          transform: matrix(-1, 0, 0, -1, 1, 1);
        }
      }

      &[data-main-rotation="270"] {
        mask,
        use:not(.clip, .mask) {
          transform: matrix(0, -1, 1, 0, 0, 1);
        }
      }
    }

    &.draw {
      position: absolute;
      mix-blend-mode: normal;

      &[data-draw-rotation="90"] {
        transform: rotate(90deg);
      }

      &[data-draw-rotation="180"] {
        transform: rotate(180deg);
      }

      &[data-draw-rotation="270"] {
        transform: rotate(270deg);
      }
    }

    &.highlight {
      --blend-mode: multiply;

      @media screen and (forced-colors: active) {
        --blend-mode: difference;
      }

      position: absolute;
      mix-blend-mode: var(--blend-mode);

      &:not(.free) {
        fill-rule: evenodd;
      }
    }

    &.highlightOutline {
      position: absolute;
      mix-blend-mode: normal;
      fill-rule: evenodd;
      fill: none;

      &:not(.free) {
        &.hovered:not(.selected) {
          stroke: var(--hover-outline-color);
          stroke-width: var(--outline-width);
        }

        &.selected {
          .mainOutline {
            stroke: var(--outline-around-color);
            stroke-width: calc(
              var(--outline-width) + 2 * var(--outline-around-width)
            );
          }

          .secondaryOutline {
            stroke: var(--outline-color);
            stroke-width: var(--outline-width);
          }
        }
      }

      &.free {
        /*
          When drawing the outline we use a mask in order to remove the parts
          that are inside the shape. Unfortunately, this removes the part of the
          outline that is inside the shape. To "fix" this we increase the width
          to have what we want to be visible outside the shape.
          This is not a perfect solution, but it works well enough.
        */
        &.hovered:not(.selected) {
          stroke: var(--hover-outline-color);
          stroke-width: calc(2 * var(--outline-width));
        }

        &.selected {
          .mainOutline {
            stroke: var(--outline-around-color);
            stroke-width: calc(
              2 * (var(--outline-width) + var(--outline-around-width))
            );
          }

          .secondaryOutline {
            stroke: var(--outline-color);
            stroke-width: calc(2 * var(--outline-width));
          }
        }
      }
    }
  }
}