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Lazily create Regular shape canvases

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Creating the cached canvases is expensive and they may never be used.
E. g. the hit detect canvas is not needed with the Immediate renderer
and if a feature is never in the viewport the image is not needed either.
This commit is contained in:
Maximilian Krög
2021-07-04 15:17:23 +02:00
parent f1ecc87425
commit 53cf5bb282
1 changed files with 5 additions and 20 deletions
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25
src/ol/style/RegularShape.js
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@@ -77,7 +77,7 @@ class RegularShape extends ImageStyle {
* @private
* @type {Object<number, HTMLCanvasElement>}
*/
this.canvas_ = {};
this.canvas_ = undefined;
/**
* @private
@@ -489,28 +489,13 @@ class RegularShape extends ImageStyle {
*/
render() {
const renderOptions = this.createRenderOptions();
const context = createCanvasContext2D(
renderOptions.size,
renderOptions.size
);
this.draw_(renderOptions, context, 1);
this.canvas_ = {};
this.canvas_[1] = context.canvas;
// canvas.width and height are rounded to the closest integer
const size = context.canvas.width;
const imageSize = size;
const size = renderOptions.size;
const displacement = this.getDisplacement();
this.hitDetectionImageSize_ = [renderOptions.size, renderOptions.size];
this.createHitDetectionCanvas_(renderOptions);
this.canvas_ = {};
this.anchor_ = [size / 2 - displacement[0], size / 2 + displacement[1]];
this.size_ = [size, size];
this.imageSize_ = [imageSize, imageSize];
this.imageSize_ = [size, size];
this.hitDetectionImageSize_ = [size, size];
}
/**