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Introduce getTileBounds method for tiledImage

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This wraps the implementation in tileSource but provides support for
wrapping. It does not support getting the source bounds.

Using this function instead of the tileSource version allows the
viewport clipping optimization to work with wrapping.
This commit is contained in:
Alistair Buxton 2020-10-30 23:27:26 +00:00
parent 58a90f7c39
commit 4b13cf32fd
1 changed files with 21 additions and 12 deletions
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29
src/tiledimage.js
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@ -392,6 +392,23 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
return bounds.rotate(this.getRotation(current), this._getRotationPoint(current));
},
/**
* @function
* @param {Number} level
* @param {Number} x
* @param {Number} y
* @returns {OpenSeadragon.Rect} Where this tile fits (in normalized coordinates).
*/
getTileBounds: function( level, x, y ) {
var numTiles = this.source.getNumTiles(level);
var xMod = ( numTiles.x + ( x % numTiles.x ) ) % numTiles.x;
var yMod = ( numTiles.y + ( y % numTiles.y ) ) % numTiles.y;
var bounds = this.source.getTileBounds(level, xMod, yMod);
bounds.x += (x - xMod) / numTiles.x;
bounds.y += (this._worldHeightCurrent / this._worldWidthCurrent) * ((y - yMod) / numTiles.y);
return bounds;
},
/**
* @returns {OpenSeadragon.Point} This TiledImage's content size, in original pixels.
*/
@ -1258,15 +1275,10 @@ function updateLevel(tiledImage, haveDrawn, drawLevel, level, levelOpacity,
for (var x = topLeftTile.x; x <= bottomRightTile.x; x++) {
for (var y = topLeftTile.y; y <= bottomRightTile.y; y++) {
// Optimisation disabled with wrapping because getTileBounds does not
// work correctly with x and y outside of the number of tiles
if (!tiledImage.wrapHorizontal && !tiledImage.wrapVertical) {
var tileBounds = tiledImage.source.getTileBounds(level, x, y);
if (drawArea.intersection(tileBounds) === null) {
if (drawArea.intersection(tiledImage.getTileBounds(level, x, y)) === null) {
// This tile is outside of the viewport, no need to draw it
continue;
}
}
best = updateTile(
tiledImage,
@ -1450,7 +1462,7 @@ function getTile(
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 );
bounds = tiledImage.getTileBounds( level, x, y );
sourceBounds = tileSource.getTileBounds( level, xMod, yMod, true );
exists = tileSource.tileExists( level, xMod, yMod );
url = tileSource.getTileUrl( level, xMod, yMod );
@ -1469,9 +1481,6 @@ function getTile(
context2D = tileSource.getContext2D ?
tileSource.getContext2D(level, xMod, yMod) : undefined;
bounds.x += ( x - xMod ) / numTiles.x;
bounds.y += (worldHeight / worldWidth) * (( y - yMod ) / numTiles.y);
tile = new $.Tile(
level,
x,