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Lazily create the hit detection context

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This commit is contained in:
Frederic Junod
2019-05-15 09:41:36 +02:00
parent 2de282ae49
commit 10c6009ffa
1 changed files with 10 additions and 3 deletions
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13
src/ol/render/canvas/ExecutorGroup.js
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@@ -82,7 +82,7 @@ class ExecutorGroup extends Disposable {
* @private
* @type {CanvasRenderingContext2D}
*/
this.hitDetectionContext_ = createCanvasContext2D(1, 1);
this.hitDetectionContext_;
/**
* @private
@@ -137,8 +137,11 @@ class ExecutorGroup extends Disposable {
executors[key].disposeInternal();
}
}
const canvas = this.hitDetectionContext_.canvas;
canvas.width = canvas.height = 0;
if (this.hitDetectionContext_) {
const canvas = this.hitDetectionContext_.canvas;
canvas.width = canvas.height = 0;
}
super.disposeInternal();
}
@@ -187,6 +190,10 @@ class ExecutorGroup extends Disposable {
1 / resolution, -1 / resolution,
-rotation,
-coordinate[0], -coordinate[1]);
if (!this.hitDetectionContext_) {
this.hitDetectionContext_ = createCanvasContext2D(contextSize, contextSize);
}
const context = this.hitDetectionContext_;
if (context.canvas.width !== contextSize || context.canvas.height !== contextSize) {