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Transformation caching during reprojection triangulation

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This usually saves around 30-35% of transformation calls.
This commit is contained in:
Petr Sloup
2015-08-27 08:05:39 +02:00
parent 726bcbef83
commit 03c75a8648
1 changed files with 12 additions and 2 deletions
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14
src/ol/reproj/triangulation.js
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@@ -40,11 +40,19 @@ ol.reproj.Triangulation = function(sourceProj, targetProj, targetExtent,
*/
this.targetProj_ = targetProj;
/** @type {!Object.<string, ol.Coordinate>} */
var transformInvCache = {};
var transformInv = ol.proj.getTransform(this.targetProj_, this.sourceProj_);
/**
* @type {ol.TransformFunction}
* @param {ol.Coordinate} c
* @return {ol.Coordinate}
* @private
*/
this.transformInv_ = ol.proj.getTransform(this.targetProj_, this.sourceProj_);
this.transformInv_ = function(c) {
var key = c[0] + '/' + c[1];
return transformInvCache[key] || (transformInvCache[key] = transformInv(c));
};
/**
* @type {ol.Extent}
@@ -115,6 +123,8 @@ ol.reproj.Triangulation = function(sourceProj, targetProj, targetExtent,
this.addQuadIfValid_(tlDst, trDst, brDst, blDst,
tlDstSrc, trDstSrc, brDstSrc, blDstSrc,
ol.RASTER_REPROJ_MAX_SUBDIVISION);
transformInvCache = {};
};