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Don't creates too many canvas

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This commit is contained in:
Stéphane Brunner
2020-07-17 11:22:26 +02:00
parent bf24288f09
commit f6061f0589
1 changed files with 11 additions and 3 deletions
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src/ol/style/IconImage.js
+11 -3
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@@ -77,6 +77,11 @@ class IconImage extends EventTarget {
* @private * @private
*/ */
this.tainted_; this.tainted_;
/**
* @private
*/
this.taintedTestContext_;
} }
/** /**
@@ -85,12 +90,15 @@ class IconImage extends EventTarget {
*/ */
isTainted_() { isTainted_() {
if (this.tainted_ === undefined && this.imageState_ === ImageState.LOADED) { if (this.tainted_ === undefined && this.imageState_ === ImageState.LOADED) {
const context = createCanvasContext2D(1, 1); if (!this.taintedTestContext_) {
context.drawImage(this.image_, 0, 0); this.taintedTestContext_ = createCanvasContext2D(1, 1);
}
this.taintedTestContext_.drawImage(this.image_, 0, 0);
try { try {
context.getImageData(0, 0, 1, 1); this.taintedTestContext_.getImageData(0, 0, 1, 1);
this.tainted_ = false; this.tainted_ = false;
} catch (e) { } catch (e) {
this.taintedTestContext_ = undefined;
this.tainted_ = true; this.tainted_ = true;
} }
} }