code.gitea.io/gitea@v1.22.3/web_src/js/features/imagediff.js (about)

     1  import $ from 'jquery';
     2  import {GET} from '../modules/fetch.js';
     3  import {hideElem, loadElem, queryElemChildren} from '../utils/dom.js';
     4  import {parseDom} from '../utils.js';
     5  
     6  function getDefaultSvgBoundsIfUndefined(text, src) {
     7    const DefaultSize = 300;
     8    const MaxSize = 99999;
     9  
    10    const svgDoc = parseDom(text, 'image/svg+xml');
    11    const svg = svgDoc.documentElement;
    12    const width = svg?.width?.baseVal;
    13    const height = svg?.height?.baseVal;
    14    if (width === undefined || height === undefined) {
    15      return null; // in case some svg is invalid or doesn't have the width/height
    16    }
    17    if (width.unitType === SVGLength.SVG_LENGTHTYPE_PERCENTAGE || height.unitType === SVGLength.SVG_LENGTHTYPE_PERCENTAGE) {
    18      const img = new Image();
    19      img.src = src;
    20      if (img.width > 1 && img.width < MaxSize && img.height > 1 && img.height < MaxSize) {
    21        return {
    22          width: img.width,
    23          height: img.height,
    24        };
    25      }
    26      if (svg.hasAttribute('viewBox')) {
    27        const viewBox = svg.viewBox.baseVal;
    28        return {
    29          width: DefaultSize,
    30          height: DefaultSize * viewBox.width / viewBox.height,
    31        };
    32      }
    33      return {
    34        width: DefaultSize,
    35        height: DefaultSize,
    36      };
    37    }
    38    return null;
    39  }
    40  
    41  function createContext(imageAfter, imageBefore) {
    42    const sizeAfter = {
    43      width: imageAfter?.width || 0,
    44      height: imageAfter?.height || 0,
    45    };
    46    const sizeBefore = {
    47      width: imageBefore?.width || 0,
    48      height: imageBefore?.height || 0,
    49    };
    50    const maxSize = {
    51      width: Math.max(sizeBefore.width, sizeAfter.width),
    52      height: Math.max(sizeBefore.height, sizeAfter.height),
    53    };
    54  
    55    return {
    56      imageAfter,
    57      imageBefore,
    58      sizeAfter,
    59      sizeBefore,
    60      maxSize,
    61      ratio: [
    62        Math.floor(maxSize.width - sizeAfter.width) / 2,
    63        Math.floor(maxSize.height - sizeAfter.height) / 2,
    64        Math.floor(maxSize.width - sizeBefore.width) / 2,
    65        Math.floor(maxSize.height - sizeBefore.height) / 2,
    66      ],
    67    };
    68  }
    69  
    70  export function initImageDiff() {
    71    $('.image-diff:not([data-image-diff-loaded])').each(async function() {
    72      const $container = $(this);
    73      this.setAttribute('data-image-diff-loaded', 'true');
    74  
    75      // the container may be hidden by "viewed" checkbox, so use the parent's width for reference
    76      const diffContainerWidth = Math.max($container.closest('.diff-file-box').width() - 300, 100);
    77  
    78      const imageInfos = [{
    79        path: this.getAttribute('data-path-after'),
    80        mime: this.getAttribute('data-mime-after'),
    81        $images: $container.find('img.image-after'), // matches 3 <img>
    82        $boundsInfo: $container.find('.bounds-info-after'),
    83      }, {
    84        path: this.getAttribute('data-path-before'),
    85        mime: this.getAttribute('data-mime-before'),
    86        $images: $container.find('img.image-before'), // matches 3 <img>
    87        $boundsInfo: $container.find('.bounds-info-before'),
    88      }];
    89  
    90      await Promise.all(imageInfos.map(async (info) => {
    91        const [success] = await Promise.all(Array.from(info.$images, (img) => {
    92          return loadElem(img, info.path);
    93        }));
    94        // only the first images is associated with $boundsInfo
    95        if (!success) info.$boundsInfo.text('(image error)');
    96        if (info.mime === 'image/svg+xml') {
    97          const resp = await GET(info.path);
    98          const text = await resp.text();
    99          const bounds = getDefaultSvgBoundsIfUndefined(text, info.path);
   100          if (bounds) {
   101            info.$images.each(function() {
   102              this.setAttribute('width', bounds.width);
   103              this.setAttribute('height', bounds.height);
   104            });
   105            hideElem(info.$boundsInfo);
   106          }
   107        }
   108      }));
   109  
   110      const $imagesAfter = imageInfos[0].$images;
   111      const $imagesBefore = imageInfos[1].$images;
   112  
   113      initSideBySide(this, createContext($imagesAfter[0], $imagesBefore[0]));
   114      if ($imagesAfter.length > 0 && $imagesBefore.length > 0) {
   115        initSwipe(createContext($imagesAfter[1], $imagesBefore[1]));
   116        initOverlay(createContext($imagesAfter[2], $imagesBefore[2]));
   117      }
   118  
   119      queryElemChildren(this, '.image-diff-tabs', (el) => el.classList.remove('is-loading'));
   120  
   121      function initSideBySide(container, sizes) {
   122        let factor = 1;
   123        if (sizes.maxSize.width > (diffContainerWidth - 24) / 2) {
   124          factor = (diffContainerWidth - 24) / 2 / sizes.maxSize.width;
   125        }
   126  
   127        const widthChanged = sizes.imageAfter && sizes.imageBefore && sizes.imageAfter.naturalWidth !== sizes.imageBefore.naturalWidth;
   128        const heightChanged = sizes.imageAfter && sizes.imageBefore && sizes.imageAfter.naturalHeight !== sizes.imageBefore.naturalHeight;
   129        if (sizes.imageAfter) {
   130          const boundsInfoAfterWidth = container.querySelector('.bounds-info-after .bounds-info-width');
   131          if (boundsInfoAfterWidth) {
   132            boundsInfoAfterWidth.textContent = `${sizes.imageAfter.naturalWidth}px`;
   133            boundsInfoAfterWidth.classList.toggle('green', widthChanged);
   134          }
   135          const boundsInfoAfterHeight = container.querySelector('.bounds-info-after .bounds-info-height');
   136          if (boundsInfoAfterHeight) {
   137            boundsInfoAfterHeight.textContent = `${sizes.imageAfter.naturalHeight}px`;
   138            boundsInfoAfterHeight.classList.toggle('green', heightChanged);
   139          }
   140        }
   141  
   142        if (sizes.imageBefore) {
   143          const boundsInfoBeforeWidth = container.querySelector('.bounds-info-before .bounds-info-width');
   144          if (boundsInfoBeforeWidth) {
   145            boundsInfoBeforeWidth.textContent = `${sizes.imageBefore.naturalWidth}px`;
   146            boundsInfoBeforeWidth.classList.toggle('red', widthChanged);
   147          }
   148          const boundsInfoBeforeHeight = container.querySelector('.bounds-info-before .bounds-info-height');
   149          if (boundsInfoBeforeHeight) {
   150            boundsInfoBeforeHeight.textContent = `${sizes.imageBefore.naturalHeight}px`;
   151            boundsInfoBeforeHeight.classList.add('red', heightChanged);
   152          }
   153        }
   154  
   155        if (sizes.imageAfter) {
   156          const container = sizes.imageAfter.parentNode;
   157          sizes.imageAfter.style.width = `${sizes.sizeAfter.width * factor}px`;
   158          sizes.imageAfter.style.height = `${sizes.sizeAfter.height * factor}px`;
   159          container.style.margin = '10px auto';
   160          container.style.width = `${sizes.sizeAfter.width * factor + 2}px`;
   161          container.style.height = `${sizes.sizeAfter.height * factor + 2}px`;
   162        }
   163  
   164        if (sizes.imageBefore) {
   165          const container = sizes.imageBefore.parentNode;
   166          sizes.imageBefore.style.width = `${sizes.sizeBefore.width * factor}px`;
   167          sizes.imageBefore.style.height = `${sizes.sizeBefore.height * factor}px`;
   168          container.style.margin = '10px auto';
   169          container.style.width = `${sizes.sizeBefore.width * factor + 2}px`;
   170          container.style.height = `${sizes.sizeBefore.height * factor + 2}px`;
   171        }
   172      }
   173  
   174      function initSwipe(sizes) {
   175        let factor = 1;
   176        if (sizes.maxSize.width > diffContainerWidth - 12) {
   177          factor = (diffContainerWidth - 12) / sizes.maxSize.width;
   178        }
   179  
   180        if (sizes.imageAfter) {
   181          const container = sizes.imageAfter.parentNode;
   182          const swipeFrame = container.parentNode;
   183          sizes.imageAfter.style.width = `${sizes.sizeAfter.width * factor}px`;
   184          sizes.imageAfter.style.height = `${sizes.sizeAfter.height * factor}px`;
   185          container.style.margin = `0px ${sizes.ratio[0] * factor}px`;
   186          container.style.width = `${sizes.sizeAfter.width * factor + 2}px`;
   187          container.style.height = `${sizes.sizeAfter.height * factor + 2}px`;
   188          swipeFrame.style.padding = `${sizes.ratio[1] * factor}px 0 0 0`;
   189          swipeFrame.style.width = `${sizes.maxSize.width * factor + 2}px`;
   190        }
   191  
   192        if (sizes.imageBefore) {
   193          const container = sizes.imageBefore.parentNode;
   194          const swipeFrame = container.parentNode;
   195          sizes.imageBefore.style.width = `${sizes.sizeBefore.width * factor}px`;
   196          sizes.imageBefore.style.height = `${sizes.sizeBefore.height * factor}px`;
   197          container.style.margin = `${sizes.ratio[3] * factor}px ${sizes.ratio[2] * factor}px`;
   198          container.style.width = `${sizes.sizeBefore.width * factor + 2}px`;
   199          container.style.height = `${sizes.sizeBefore.height * factor + 2}px`;
   200          swipeFrame.style.width = `${sizes.maxSize.width * factor + 2}px`;
   201          swipeFrame.style.height = `${sizes.maxSize.height * factor + 2}px`;
   202        }
   203  
   204        // extra height for inner "position: absolute" elements
   205        const swipe = $container.find('.diff-swipe')[0];
   206        if (swipe) {
   207          swipe.style.width = `${sizes.maxSize.width * factor + 2}px`;
   208          swipe.style.height = `${sizes.maxSize.height * factor + 30}px`;
   209        }
   210  
   211        $container.find('.swipe-bar').on('mousedown', function(e) {
   212          e.preventDefault();
   213  
   214          const $swipeBar = $(this);
   215          const $swipeFrame = $swipeBar.parent();
   216          const width = $swipeFrame.width() - $swipeBar.width() - 2;
   217  
   218          $(document).on('mousemove.diff-swipe', (e2) => {
   219            e2.preventDefault();
   220  
   221            const value = Math.max(0, Math.min(e2.clientX - $swipeFrame.offset().left, width));
   222            $swipeBar[0].style.left = `${value}px`;
   223            $container.find('.swipe-container')[0].style.width = `${$swipeFrame.width() - value}px`;
   224  
   225            $(document).on('mouseup.diff-swipe', () => {
   226              $(document).off('.diff-swipe');
   227            });
   228          });
   229        });
   230      }
   231  
   232      function initOverlay(sizes) {
   233        let factor = 1;
   234        if (sizes.maxSize.width > diffContainerWidth - 12) {
   235          factor = (diffContainerWidth - 12) / sizes.maxSize.width;
   236        }
   237  
   238        if (sizes.imageAfter) {
   239          const container = sizes.imageAfter.parentNode;
   240          sizes.imageAfter.style.width = `${sizes.sizeAfter.width * factor}px`;
   241          sizes.imageAfter.style.height = `${sizes.sizeAfter.height * factor}px`;
   242          container.style.margin = `${sizes.ratio[1] * factor}px ${sizes.ratio[0] * factor}px`;
   243          container.style.width = `${sizes.sizeAfter.width * factor + 2}px`;
   244          container.style.height = `${sizes.sizeAfter.height * factor + 2}px`;
   245        }
   246  
   247        if (sizes.imageBefore) {
   248          const container = sizes.imageBefore.parentNode;
   249          const overlayFrame = container.parentNode;
   250          sizes.imageBefore.style.width = `${sizes.sizeBefore.width * factor}px`;
   251          sizes.imageBefore.style.height = `${sizes.sizeBefore.height * factor}px`;
   252          container.style.margin = `${sizes.ratio[3] * factor}px ${sizes.ratio[2] * factor}px`;
   253          container.style.width = `${sizes.sizeBefore.width * factor + 2}px`;
   254          container.style.height = `${sizes.sizeBefore.height * factor + 2}px`;
   255  
   256          // some inner elements are `position: absolute`, so the container's height must be large enough
   257          overlayFrame.style.width = `${sizes.maxSize.width * factor + 2}px`;
   258          overlayFrame.style.height = `${sizes.maxSize.height * factor + 2}px`;
   259        }
   260  
   261        const rangeInput = $container[0].querySelector('input[type="range"]');
   262        function updateOpacity() {
   263          if (sizes.imageAfter) {
   264            sizes.imageAfter.parentNode.style.opacity = `${rangeInput.value / 100}`;
   265          }
   266        }
   267        rangeInput?.addEventListener('input', updateOpacity);
   268        updateOpacity();
   269      }
   270    });
   271  }