/* * OpenSeadragon - Drawer * * Copyright (C) 2009 CodePlex Foundation * Copyright (C) 2010-2013 OpenSeadragon contributors * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of CodePlex Foundation nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ (function( $ ){ var DEVICE_SCREEN = $.getWindowSize(), BROWSER = $.Browser.vendor, BROWSER_VERSION = $.Browser.version, SUBPIXEL_RENDERING = ( ( BROWSER == $.BROWSERS.FIREFOX ) || ( BROWSER == $.BROWSERS.OPERA ) || ( BROWSER == $.BROWSERS.SAFARI && BROWSER_VERSION >= 4 ) || ( BROWSER == $.BROWSERS.CHROME && BROWSER_VERSION >= 2 ) || ( BROWSER == $.BROWSERS.IE && BROWSER_VERSION >= 9 ) ), USE_CANVAS = SUBPIXEL_RENDERING && !( DEVICE_SCREEN.x <= 400 || DEVICE_SCREEN.y <= 400 ) && !( navigator.appVersion.match( 'Mobile' ) ) && $.isFunction( document.createElement( "canvas" ).getContext ); //console.error( 'USE_CANVAS ' + USE_CANVAS ); /** * @class * @param {OpenSeadragon.TileSource} source - Reference to Viewer tile source. * @param {OpenSeadragon.Viewport} viewport - Reference to Viewer viewport. * @param {Element} element - Reference to Viewer 'canvas'. * @property {OpenSeadragon.TileSource} source - Reference to Viewer tile source. * @property {OpenSeadragon.Viewport} viewport - Reference to Viewer viewport. * @property {Element} container - Reference to Viewer 'canvas'. * @property {Element|Canvas} canvas - TODO * @property {CanvasContext} context - TODO * @property {Object} config - Reference to Viewer config. * @property {Number} downloading - How many images are currently being loaded in parallel. * @property {Number} normHeight - Ratio of zoomable image height to width. * @property {Object} tilesMatrix - A '3d' dictionary [level][x][y] --> Tile. * @property {Array} tilesLoaded - An unordered list of Tiles with loaded images. * @property {Object} coverage - A '3d' dictionary [level][x][y] --> Boolean. * @property {Array} overlays - An unordered list of Overlays added. * @property {Array} lastDrawn - An unordered list of Tiles drawn last frame. * @property {Number} lastResetTime - Last time for which the drawer was reset. * @property {Boolean} midUpdate - Is the drawer currently updating the viewport? * @property {Boolean} updateAgain - Does the drawer need to update the viewort again? * @property {Element} element - DEPRECATED Alias for container. */ $.Drawer = function( options ) { //backward compatibility for positional args while prefering more //idiomatic javascript options object as the only argument var args = arguments, i; if( !$.isPlainObject( options ) ){ options = { source: args[ 0 ], viewport: args[ 1 ], element: args[ 2 ] }; } $.extend( true, this, { //internal state properties viewer: null, downloading: 0, tilesMatrix: {}, tilesLoaded: [], coverage: {}, lastDrawn: [], lastResetTime: 0, midUpdate: false, updateAgain: true, //internal state / configurable settings overlays: [], collectionOverlays: {}, //configurable settings maxImageCacheCount: $.DEFAULT_SETTINGS.maxImageCacheCount, imageLoaderLimit: $.DEFAULT_SETTINGS.imageLoaderLimit, minZoomImageRatio: $.DEFAULT_SETTINGS.minZoomImageRatio, wrapHorizontal: $.DEFAULT_SETTINGS.wrapHorizontal, wrapVertical: $.DEFAULT_SETTINGS.wrapVertical, immediateRender: $.DEFAULT_SETTINGS.immediateRender, blendTime: $.DEFAULT_SETTINGS.blendTime, alwaysBlend: $.DEFAULT_SETTINGS.alwaysBlend, minPixelRatio: $.DEFAULT_SETTINGS.minPixelRatio, debugMode: $.DEFAULT_SETTINGS.debugMode, timeout: $.DEFAULT_SETTINGS.timeout }, options ); this.container = $.getElement( this.element ); this.canvas = $.makeNeutralElement( USE_CANVAS ? "canvas" : "div" ); this.context = USE_CANVAS ? this.canvas.getContext( "2d" ) : null; this.normHeight = this.source.dimensions.y / this.source.dimensions.x; this.element = this.container; this.canvas.style.width = "100%"; this.canvas.style.height = "100%"; this.canvas.style.position = "absolute"; // explicit left-align this.container.style.textAlign = "left"; this.container.appendChild( this.canvas ); //create the correct type of overlay by convention if the overlays //are not already OpenSeadragon.Overlays for( i = 0; i < this.overlays.length; i++ ){ if( $.isPlainObject( this.overlays[ i ] ) ){ this.overlays[ i ] = addOverlayFromConfiguration( this, this.overlays[ i ]); } else if ( $.isFunction( this.overlays[ i ] ) ){ //TODO } } //this.profiler = new $.Profiler(); }; $.Drawer.prototype = { /** * Adds an html element as an overlay to the current viewport. Useful for * highlighting words or areas of interest on an image or other zoomable * interface. * @method * @param {Element|String|Object} element - A reference to an element or an id for * the element which will overlayed. Or an Object specifying the configuration for the overlay * @param {OpenSeadragon.Point|OpenSeadragon.Rect} location - The point or * rectangle which will be overlayed. * @param {OpenSeadragon.OverlayPlacement} placement - The position of the * viewport which the location coordinates will be treated as relative * to. * @param {function} onDraw - If supplied the callback is called when the overlay * needs to be drawn. It it the responsibility of the callback to do any drawing/positioning. * It is passed position, size and element. */ addOverlay: function( element, location, placement, onDraw ) { var options; if( $.isPlainObject( element ) ){ options = element; } else { options = { element: element, location: location, placement: placement, onDraw: onDraw }; } element = $.getElement(options.element); if ( getOverlayIndex( this.overlays, element ) >= 0 ) { // they're trying to add a duplicate overlay return; } this.overlays.push( new $.Overlay({ element: element, location: options.location, placement: options.placement, onDraw: options.onDraw }) ); this.updateAgain = true; if( this.viewer ){ this.viewer.raiseEvent( 'add-overlay', { viewer: this.viewer, element: element, location: options.location, placement: options.placement }); } return this; }, /** * Updates the overlay represented by the reference to the element or * element id moving it to the new location, relative to the new placement. * @method * @param {OpenSeadragon.Point|OpenSeadragon.Rect} location - The point or * rectangle which will be overlayed. * @param {OpenSeadragon.OverlayPlacement} placement - The position of the * viewport which the location coordinates will be treated as relative * to. * @return {OpenSeadragon.Drawer} Chainable. */ updateOverlay: function( element, location, placement ) { var i; element = $.getElement( element ); i = getOverlayIndex( this.overlays, element ); if ( i >= 0 ) { this.overlays[ i ].update( location, placement ); this.updateAgain = true; } if( this.viewer ){ this.viewer.raiseEvent( 'update-overlay', { viewer: this.viewer, element: element, location: location, placement: placement }); } return this; }, /** * Removes and overlay identified by the reference element or element id * and schedules and update. * @method * @param {Element|String} element - A reference to the element or an * element id which represent the ovelay content to be removed. * @return {OpenSeadragon.Drawer} Chainable. */ removeOverlay: function( element ) { var i; element = $.getElement( element ); i = getOverlayIndex( this.overlays, element ); if ( i >= 0 ) { this.overlays[ i ].destroy(); this.overlays.splice( i, 1 ); this.updateAgain = true; } if( this.viewer ){ this.viewer.raiseEvent( 'remove-overlay', { viewer: this.viewer, element: element }); } return this; }, /** * Removes all currently configured Overlays from this Drawer and schedules * and update. * @method * @return {OpenSeadragon.Drawer} Chainable. */ clearOverlays: function() { while ( this.overlays.length > 0 ) { this.overlays.pop().destroy(); this.updateAgain = true; } if( this.viewer ){ this.viewer.raiseEvent( 'clear-overlay', { viewer: this.viewer }); } return this; }, /** * Returns whether the Drawer is scheduled for an update at the * soonest possible opportunity. * @method * @returns {Boolean} - Whether the Drawer is scheduled for an update at the * soonest possible opportunity. */ needsUpdate: function() { return this.updateAgain; }, /** * Returns the total number of tiles that have been loaded by this Drawer. * @method * @returns {Number} - The total number of tiles that have been loaded by * this Drawer. */ numTilesLoaded: function() { return this.tilesLoaded.length; }, /** * Clears all tiles and triggers an update on the next call to * Drawer.prototype.update(). * @method * @return {OpenSeadragon.Drawer} Chainable. */ reset: function() { clearTiles( this ); this.lastResetTime = $.now(); this.updateAgain = true; return this; }, /** * Forces the Drawer to update. * @method * @return {OpenSeadragon.Drawer} Chainable. */ update: function() { //this.profiler.beginUpdate(); this.midUpdate = true; updateViewport( this ); this.midUpdate = false; //this.profiler.endUpdate(); return this; }, /** * Used internally to load images when required. May also be used to * preload a set of images so the browser will have them available in * the local cache to optimize user experience in certain cases. Because * the number of parallel image loads is configurable, if too many images * are currently being loaded, the request will be ignored. Since by * default drawer.imageLoaderLimit is 0, the native browser parallel * image loading policy will be used. * @method * @param {String} src - The url of the image to load. * @param {Function} callback - The function that will be called with the * Image object as the only parameter if it was loaded successfully. * If an error occured, or the request timed out or was aborted, * the parameter is null instead. * @return {Boolean} loading - Whether the request was submitted or ignored * based on OpenSeadragon.DEFAULT_SETTINGS.imageLoaderLimit. */ loadImage: function( src, callback ) { var _this = this, loading = false, image, jobid, complete; if ( !this.imageLoaderLimit || this.downloading < this.imageLoaderLimit ) { this.downloading++; image = new Image(); complete = function( imagesrc, resultingImage ){ _this.downloading--; if (typeof ( callback ) == "function") { try { callback( resultingImage ); } catch ( e ) { $.console.error( "%s while executing %s callback: %s", e.name, src, e.message, e ); } } }; image.onload = function(){ finishLoadingImage( image, complete, true, jobid ); }; image.onabort = image.onerror = function(){ finishLoadingImage( image, complete, false, jobid ); }; jobid = window.setTimeout( function(){ finishLoadingImage( image, complete, false, jobid ); }, this.timeout ); loading = true; image.src = src; } return loading; } }; /** * @private * @inner */ function addOverlayFromConfiguration( drawer, overlay ){ var element = null, rect = ( overlay.height && overlay.width ) ? new $.Rect( overlay.x || overlay.px, overlay.y || overlay.py, overlay.width, overlay.height ) : new $.Point( overlay.x || overlay.px, overlay.y || overlay.py ), id = overlay.id ? overlay.id : "openseadragon-overlay-"+Math.floor(Math.random()*10000000); element = $.getElement(overlay.id); if( !element ){ element = document.createElement("a"); element.href = "#/overlay/"+id; } element.id = id; $.addClass( element, overlay.className ? overlay.className : "openseadragon-overlay" ); if(overlay.px !== undefined){ //if they specified 'px' so it's in pixel coordinates so //we need to translate to viewport coordinates rect = drawer.viewport.imageToViewportRectangle( rect ); } if( overlay.placement ){ return new $.Overlay({ element: element, location: drawer.viewport.pointFromPixel(rect), placement: $.OverlayPlacement[overlay.placement.toUpperCase()], onDraw: overlay.onDraw }); }else{ return new $.Overlay({ element: element, location: rect, onDraw: overlay.onDraw }); } } /** * @private * @inner * Pretty much every other line in this needs to be documented so it's clear * how each piece of this routine contributes to the drawing process. That's * why there are so many TODO's inside this function. */ function updateViewport( drawer ) { drawer.updateAgain = false; if( drawer.viewer ){ drawer.viewer.raiseEvent( 'update-viewport', { viewer: drawer.viewer }); } var tile, level, best = null, haveDrawn = false, currentTime = $.now(), viewportSize = drawer.viewport.getContainerSize(), viewportBounds = drawer.viewport.getBounds( true ), viewportTL = viewportBounds.getTopLeft(), viewportBR = viewportBounds.getBottomRight(), zeroRatioC = drawer.viewport.deltaPixelsFromPoints( drawer.source.getPixelRatio( 0 ), true ).x, lowestLevel = Math.max( drawer.source.minLevel, Math.floor( Math.log( drawer.minZoomImageRatio ) / Math.log( 2 ) ) ), highestLevel = Math.min( Math.abs(drawer.source.maxLevel), Math.abs(Math.floor( Math.log( zeroRatioC / drawer.minPixelRatio ) / Math.log( 2 ) )) ), renderPixelRatioC, renderPixelRatioT, zeroRatioT, optimalRatio, levelOpacity, levelVisibility; //TODO while ( drawer.lastDrawn.length > 0 ) { tile = drawer.lastDrawn.pop(); tile.beingDrawn = false; } //TODO drawer.canvas.innerHTML = ""; if ( USE_CANVAS ) { if( drawer.canvas.width != viewportSize.x || drawer.canvas.height != viewportSize.y ){ drawer.canvas.width = viewportSize.x; drawer.canvas.height = viewportSize.y; } drawer.context.clearRect( 0, 0, viewportSize.x, viewportSize.y ); } //TODO if ( !drawer.wrapHorizontal && ( viewportBR.x < 0 || viewportTL.x > 1 ) ) { return; } else if ( !drawer.wrapVertical && ( viewportBR.y < 0 || viewportTL.y > drawer.normHeight ) ) { return; } //TODO if ( !drawer.wrapHorizontal ) { viewportTL.x = Math.max( viewportTL.x, 0 ); viewportBR.x = Math.min( viewportBR.x, 1 ); } if ( !drawer.wrapVertical ) { viewportTL.y = Math.max( viewportTL.y, 0 ); viewportBR.y = Math.min( viewportBR.y, drawer.normHeight ); } //TODO lowestLevel = Math.min( lowestLevel, highestLevel ); //TODO var drawLevel; // FIXME: drawLevel should have a more explanatory name for ( level = highestLevel; level >= lowestLevel; level-- ) { drawLevel = false; //Avoid calculations for draw if we have already drawn this renderPixelRatioC = drawer.viewport.deltaPixelsFromPoints( drawer.source.getPixelRatio( level ), true ).x; if ( ( !haveDrawn && renderPixelRatioC >= drawer.minPixelRatio ) || ( level == lowestLevel ) ) { drawLevel = true; haveDrawn = true; } else if ( !haveDrawn ) { continue; } renderPixelRatioT = drawer.viewport.deltaPixelsFromPoints( drawer.source.getPixelRatio( level ), false ).x; zeroRatioT = drawer.viewport.deltaPixelsFromPoints( drawer.source.getPixelRatio( Math.max( drawer.source.getClosestLevel( drawer.viewport.containerSize ) - 1, 0 ) ), false ).x; optimalRatio = drawer.immediateRender ? 1 : zeroRatioT; levelOpacity = Math.min( 1, ( renderPixelRatioC - 0.5 ) / 0.5 ); levelVisibility = optimalRatio / Math.abs( optimalRatio - renderPixelRatioT ); //TODO best = updateLevel( drawer, haveDrawn, drawLevel, level, levelOpacity, levelVisibility, viewportTL, viewportBR, currentTime, best ); //TODO if ( providesCoverage( drawer.coverage, level ) ) { break; } } //TODO drawTiles( drawer, drawer.lastDrawn ); drawOverlays( drawer.viewport, drawer.overlays, drawer.container ); //TODO if ( best ) { loadTile( drawer, best, currentTime ); // because we haven't finished drawing, so drawer.updateAgain = true; } } function updateLevel( drawer, haveDrawn, drawLevel, level, levelOpacity, levelVisibility, viewportTL, viewportBR, currentTime, best ){ var x, y, tileTL, tileBR, numberOfTiles, viewportCenter = drawer.viewport.pixelFromPoint( drawer.viewport.getCenter() ); if( drawer.viewer ){ drawer.viewer.raiseEvent( 'update-level', { viewer: drawer.viewer, havedrawn: haveDrawn, level: level, opacity: levelOpacity, visibility: levelVisibility, topleft: viewportTL, bottomright: viewportBR, currenttime: currentTime, best: best }); } //OK, a new drawing so do your calculations tileTL = drawer.source.getTileAtPoint( level, viewportTL ); tileBR = drawer.source.getTileAtPoint( level, viewportBR ); numberOfTiles = drawer.source.getNumTiles( level ); resetCoverage( drawer.coverage, level ); if ( !drawer.wrapHorizontal ) { tileBR.x = Math.min( tileBR.x, numberOfTiles.x - 1 ); } if ( !drawer.wrapVertical ) { tileBR.y = Math.min( tileBR.y, numberOfTiles.y - 1 ); } for ( x = tileTL.x; x <= tileBR.x; x++ ) { for ( y = tileTL.y; y <= tileBR.y; y++ ) { best = updateTile( drawer, drawLevel, haveDrawn, x, y, level, levelOpacity, levelVisibility, viewportCenter, numberOfTiles, currentTime, best ); } } return best; } function updateTile( drawer, drawLevel, haveDrawn, x, y, level, levelOpacity, levelVisibility, viewportCenter, numberOfTiles, currentTime, best){ var tile = getTile( x, y, level, drawer.source, drawer.tilesMatrix, currentTime, numberOfTiles, drawer.normHeight ), drawTile = drawLevel; if( drawer.viewer ){ drawer.viewer.raiseEvent( 'update-tile', { viewer: drawer.viewer, tile: tile }); } setCoverage( drawer.coverage, level, x, y, false ); if ( !tile.exists ) { return best; } if ( haveDrawn && !drawTile ) { if ( isCovered( drawer.coverage, level, x, y ) ) { setCoverage( drawer.coverage, level, x, y, true ); } else { drawTile = true; } } if ( !drawTile ) { return best; } positionTile( tile, drawer.source.tileOverlap, drawer.viewport, viewportCenter, levelVisibility ); if ( tile.loaded ) { var needsUpdate = blendTile( drawer, tile, x, y, level, levelOpacity, currentTime ); if ( needsUpdate ) { drawer.updateAgain = true; } } else if ( tile.loading ) { // the tile is already in the download queue // thanks josh1093 for finally translating this typo } else { best = compareTiles( best, tile ); } return best; } function getTile( x, y, level, tileSource, tilesMatrix, time, numTiles, normHeight ) { var xMod, yMod, bounds, exists, url, tile; if ( !tilesMatrix[ level ] ) { tilesMatrix[ level ] = {}; } if ( !tilesMatrix[ level ][ x ] ) { tilesMatrix[ level ][ x ] = {}; } if ( !tilesMatrix[ level ][ x ][ y ] ) { xMod = ( numTiles.x + ( x % numTiles.x ) ) % numTiles.x; yMod = ( numTiles.y + ( y % numTiles.y ) ) % numTiles.y; bounds = tileSource.getTileBounds( level, xMod, yMod ); exists = tileSource.tileExists( level, xMod, yMod ); url = tileSource.getTileUrl( level, xMod, yMod ); bounds.x += 1.0 * ( x - xMod ) / numTiles.x; bounds.y += normHeight * ( y - yMod ) / numTiles.y; tilesMatrix[ level ][ x ][ y ] = new $.Tile( level, x, y, bounds, exists, url ); } tile = tilesMatrix[ level ][ x ][ y ]; tile.lastTouchTime = time; return tile; } function loadTile( drawer, tile, time ) { if( drawer.viewport.collectionMode ){ drawer.midUpdate = false; onTileLoad( drawer, tile, time ); } else { tile.loading = drawer.loadImage( tile.url, function( image ){ onTileLoad( drawer, tile, time, image ); } ); } } function onTileLoad( drawer, tile, time, image ) { var insertionIndex, cutoff, worstTile, worstTime, worstLevel, worstTileIndex, prevTile, prevTime, prevLevel, i; tile.loading = false; if ( drawer.midUpdate ) { $.console.warn( "Tile load callback in middle of drawing routine." ); return; } else if ( !image && !drawer.viewport.collectionMode ) { $.console.log( "Tile %s failed to load: %s", tile, tile.url ); if( !drawer.debugMode ){ tile.exists = false; return; } } else if ( time < drawer.lastResetTime ) { $.console.log( "Ignoring tile %s loaded before reset: %s", tile, tile.url ); return; } tile.loaded = true; tile.image = image; insertionIndex = drawer.tilesLoaded.length; if ( drawer.tilesLoaded.length >= drawer.maxImageCacheCount ) { cutoff = Math.ceil( Math.log( drawer.source.tileSize ) / Math.log( 2 ) ); worstTile = null; worstTileIndex = -1; for ( i = drawer.tilesLoaded.length - 1; i >= 0; i-- ) { prevTile = drawer.tilesLoaded[ i ]; if ( prevTile.level <= drawer.cutoff || prevTile.beingDrawn ) { continue; } else if ( !worstTile ) { worstTile = prevTile; worstTileIndex = i; continue; } prevTime = prevTile.lastTouchTime; worstTime = worstTile.lastTouchTime; prevLevel = prevTile.level; worstLevel = worstTile.level; if ( prevTime < worstTime || ( prevTime == worstTime && prevLevel > worstLevel ) ) { worstTile = prevTile; worstTileIndex = i; } } if ( worstTile && worstTileIndex >= 0 ) { worstTile.unload(); insertionIndex = worstTileIndex; } } drawer.tilesLoaded[ insertionIndex ] = tile; drawer.updateAgain = true; } function positionTile( tile, overlap, viewport, viewportCenter, levelVisibility ){ var boundsTL = tile.bounds.getTopLeft(), boundsSize = tile.bounds.getSize(), positionC = viewport.pixelFromPoint( boundsTL, true ), positionT = viewport.pixelFromPoint( boundsTL, false ), sizeC = viewport.deltaPixelsFromPoints( boundsSize, true ), sizeT = viewport.deltaPixelsFromPoints( boundsSize, false ), tileCenter = positionT.plus( sizeT.divide( 2 ) ), tileDistance = viewportCenter.distanceTo( tileCenter ); if ( !overlap ) { sizeC = sizeC.plus( new $.Point( 1, 1 ) ); } tile.position = positionC; tile.size = sizeC; tile.distance = tileDistance; tile.visibility = levelVisibility; } function blendTile( drawer, tile, x, y, level, levelOpacity, currentTime ){ var blendTimeMillis = 1000 * drawer.blendTime, deltaTime, opacity; if ( !tile.blendStart ) { tile.blendStart = currentTime; } deltaTime = currentTime - tile.blendStart; opacity = blendTimeMillis ? Math.min( 1, deltaTime / ( blendTimeMillis ) ) : 1; if ( drawer.alwaysBlend ) { opacity *= levelOpacity; } tile.opacity = opacity; drawer.lastDrawn.push( tile ); if ( opacity == 1 ) { setCoverage( drawer.coverage, level, x, y, true ); } else if ( deltaTime < blendTimeMillis ) { return true; } return false; } function clearTiles( drawer ) { drawer.tilesMatrix = {}; drawer.tilesLoaded = []; } /** * @private * @inner * Returns true if the given tile provides coverage to lower-level tiles of * lower resolution representing the same content. If neither x nor y is * given, returns true if the entire visible level provides coverage. * * Note that out-of-bounds tiles provide coverage in this sense, since * there's no content that they would need to cover. Tiles at non-existent * levels that are within the image bounds, however, do not. */ function providesCoverage( coverage, level, x, y ) { var rows, cols, i, j; if ( !coverage[ level ] ) { return false; } if ( x === undefined || y === undefined ) { rows = coverage[ level ]; for ( i in rows ) { if ( rows.hasOwnProperty( i ) ) { cols = rows[ i ]; for ( j in cols ) { if ( cols.hasOwnProperty( j ) && !cols[ j ] ) { return false; } } } } return true; } return ( coverage[ level ][ x] === undefined || coverage[ level ][ x ][ y ] === undefined || coverage[ level ][ x ][ y ] === true ); } /** * @private * @inner * Returns true if the given tile is completely covered by higher-level * tiles of higher resolution representing the same content. If neither x * nor y is given, returns true if the entire visible level is covered. */ function isCovered( coverage, level, x, y ) { if ( x === undefined || y === undefined ) { return providesCoverage( coverage, level + 1 ); } else { return ( providesCoverage( coverage, level + 1, 2 * x, 2 * y ) && providesCoverage( coverage, level + 1, 2 * x, 2 * y + 1 ) && providesCoverage( coverage, level + 1, 2 * x + 1, 2 * y ) && providesCoverage( coverage, level + 1, 2 * x + 1, 2 * y + 1 ) ); } } /** * @private * @inner * Sets whether the given tile provides coverage or not. */ function setCoverage( coverage, level, x, y, covers ) { if ( !coverage[ level ] ) { $.console.warn( "Setting coverage for a tile before its level's coverage has been reset: %s", level ); return; } if ( !coverage[ level ][ x ] ) { coverage[ level ][ x ] = {}; } coverage[ level ][ x ][ y ] = covers; } /** * @private * @inner * Resets coverage information for the given level. This should be called * after every draw routine. Note that at the beginning of the next draw * routine, coverage for every visible tile should be explicitly set. */ function resetCoverage( coverage, level ) { coverage[ level ] = {}; } /** * @private * @inner * Determines the 'z-index' of the given overlay. Overlays are ordered in * a z-index based on the order they are added to the Drawer. */ function getOverlayIndex( overlays, element ) { var i; for ( i = overlays.length - 1; i >= 0; i-- ) { if ( overlays[ i ].element == element ) { return i; } } return -1; } /** * @private * @inner * Determines whether the 'last best' tile for the area is better than the * tile in question. */ function compareTiles( previousBest, tile ) { if ( !previousBest ) { return tile; } if ( tile.visibility > previousBest.visibility ) { return tile; } else if ( tile.visibility == previousBest.visibility ) { if ( tile.distance < previousBest.distance ) { return tile; } } return previousBest; } function finishLoadingImage( image, callback, successful, jobid ){ image.onload = null; image.onabort = null; image.onerror = null; if ( jobid ) { window.clearTimeout( jobid ); } $.requestAnimationFrame( function() { callback( image.src, successful ? image : null); }); } function drawOverlays( viewport, overlays, container ){ var i, length = overlays.length; for ( i = 0; i < length; i++ ) { drawOverlay( viewport, overlays[ i ], container ); } } function drawOverlay( viewport, overlay, container ){ overlay.position = viewport.pixelFromPoint( overlay.bounds.getTopLeft(), true ); overlay.size = viewport.deltaPixelsFromPoints( overlay.bounds.getSize(), true ); overlay.drawHTML( container ); } function drawTiles( drawer, lastDrawn ){ var i, tile, tileKey, viewer, viewport, position, tileSource, collectionTileSource; for ( i = lastDrawn.length - 1; i >= 0; i-- ) { tile = lastDrawn[ i ]; //We dont actually 'draw' a collection tile, rather its used to house //an overlay which does the drawing in its own viewport if( drawer.viewport.collectionMode ){ tileKey = tile.x + '/' + tile.y; viewport = drawer.viewport; collectionTileSource = viewport.collectionTileSource; if( !drawer.collectionOverlays[ tileKey ] ){ position = collectionTileSource.layout == 'horizontal' ? tile.y + ( tile.x * collectionTileSource.rows ) : tile.x + ( tile.y * collectionTileSource.rows ); if (position < collectionTileSource.tileSources.length) { tileSource = collectionTileSource.tileSources[ position ]; } else { tileSource = null; } //$.console.log("Rendering collection tile %s | %s | %s", tile.y, tile.y, position); if( tileSource ){ drawer.collectionOverlays[ tileKey ] = viewer = new $.Viewer({ element: $.makeNeutralElement( "div" ), mouseNavEnabled: false, showNavigator: false, showSequenceControl: false, showNavigationControl: false, tileSources: [ tileSource ] }); //TODO: IE seems to barf on this, not sure if its just the border // but we probably need to clear this up with a better // test of support for various css features if( SUBPIXEL_RENDERING ){ viewer.element.style.border = '1px solid rgba(255,255,255,0.38)'; viewer.element.style['-webkit-box-reflect'] = 'below 0px -webkit-gradient('+ 'linear,left '+ 'top,left '+ 'bottom,from(transparent),color-stop(62%,transparent),to(rgba(255,255,255,0.62))'+ ')'; } drawer.addOverlay( viewer.element, tile.bounds ); } }else{ viewer = drawer.collectionOverlays[ tileKey ]; if( viewer.viewport ){ viewer.viewport.resize( tile.size, true ); viewer.viewport.goHome( true ); } } } else { if ( USE_CANVAS ) { tile.drawCanvas( drawer.context ); } else { tile.drawHTML( drawer.canvas ); } tile.beingDrawn = true; } if( drawer.debugMode ){ try{ drawDebugInfo( drawer, tile, lastDrawn.length, i ); }catch(e){ $.console.error(e); } } if( drawer.viewer ){ drawer.viewer.raiseEvent( 'tile-drawn', { viewer: drawer.viewer, tile: tile }); } } } function drawDebugInfo( drawer, tile, count, i ){ if ( USE_CANVAS ) { drawer.context.save(); drawer.context.lineWidth = 2; drawer.context.font = 'small-caps bold 13px ariel'; drawer.context.strokeStyle = drawer.debugGridColor; drawer.context.fillStyle = drawer.debugGridColor; drawer.context.strokeRect( tile.position.x, tile.position.y, tile.size.x, tile.size.y ); if( tile.x === 0 && tile.y === 0 ){ drawer.context.fillText( "Zoom: " + drawer.viewport.getZoom(), tile.position.x, tile.position.y - 30 ); drawer.context.fillText( "Pan: " + drawer.viewport.getBounds().toString(), tile.position.x, tile.position.y - 20 ); } drawer.context.fillText( "Level: " + tile.level, tile.position.x + 10, tile.position.y + 20 ); drawer.context.fillText( "Column: " + tile.x, tile.position.x + 10, tile.position.y + 30 ); drawer.context.fillText( "Row: " + tile.y, tile.position.x + 10, tile.position.y + 40 ); drawer.context.fillText( "Order: " + i + " of " + count, tile.position.x + 10, tile.position.y + 50 ); drawer.context.fillText( "Size: " + tile.size.toString(), tile.position.x + 10, tile.position.y + 60 ); drawer.context.fillText( "Position: " + tile.position.toString(), tile.position.x + 10, tile.position.y + 70 ); drawer.context.restore(); } } }( OpenSeadragon ));