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Reduce garbage generation

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This commit is contained in:
Frederic Junod
2019-01-21 10:18:19 +01:00
parent be03ac4c50
commit 89ca596eaf
1 changed files with 15 additions and 8 deletions
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23
src/ol/render/canvas/Builder.js
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@@ -97,6 +97,12 @@ class CanvasBuilder extends VectorContext {
*/
this.coordinates = [];
/**
* @private
* @type {import("../../coordinate.js").Coordinate}
*/
this.tmpCoordinate_ = [];
/**
* @protected
* @type {Array<*>}
@@ -140,8 +146,9 @@ class CanvasBuilder extends VectorContext {
if (skipFirst) {
offset += stride;
}
const lastCoord = [flatCoordinates[offset], flatCoordinates[offset + 1]];
const nextCoord = [NaN, NaN];
let lastXCoord = flatCoordinates[offset];
let lastYCoord = flatCoordinates[offset + 1];
const nextCoord = this.tmpCoordinate_;
let skipped = true;
let i, lastRel, nextRel;
@@ -151,8 +158,8 @@ class CanvasBuilder extends VectorContext {
nextRel = coordinateRelationship(extent, nextCoord);
if (nextRel !== lastRel) {
if (skipped) {
this.coordinates[myEnd++] = lastCoord[0];
this.coordinates[myEnd++] = lastCoord[1];
this.coordinates[myEnd++] = lastXCoord;
this.coordinates[myEnd++] = lastYCoord;
}
this.coordinates[myEnd++] = nextCoord[0];
this.coordinates[myEnd++] = nextCoord[1];
@@ -164,15 +171,15 @@ class CanvasBuilder extends VectorContext {
} else {
skipped = true;
}
lastCoord[0] = nextCoord[0];
lastCoord[1] = nextCoord[1];
lastXCoord = nextCoord[0];
lastYCoord = nextCoord[1];
lastRel = nextRel;
}
// Last coordinate equals first or only one point to append:
if ((closed && skipped) || i === offset + stride) {
this.coordinates[myEnd++] = lastCoord[0];
this.coordinates[myEnd++] = lastCoord[1];
this.coordinates[myEnd++] = lastXCoord;
this.coordinates[myEnd++] = lastYCoord;
}
return myEnd;
}