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#11235

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GetDataAtPixel performance improvement
This commit is contained in:
Kamil
2020-07-05 17:52:51 +02:00
parent 4727208e6e
commit a151d1b7a5
1 changed files with 9 additions and 6 deletions
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15
src/ol/renderer/canvas/Layer.js
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@@ -282,12 +282,15 @@ class CanvasLayerRenderer extends LayerRenderer {
let data;
try {
data = context.getImageData(
Math.round(renderPixel[0]),
Math.round(renderPixel[1]),
1,
1
).data;
const x = Math.round(renderPixel[0]);
const y = Math.round(renderPixel[1]);
const newCanvas = document.createElement('canvas');
const newContext = newCanvas.getContext('2d');
newCanvas.width = 1;
newCanvas.height = 1;
newContext.clearRect(0, 0, 1, 1);
newContext.drawImage(context.canvas, x, y, 1, 1, 0, 0, 1, 1);
data = newContext.getImageData(0, 0, 1, 1).data;
} catch (err) {
if (err.name === 'SecurityError') {
// tainted canvas, we assume there is data at the given pixel (although there might not be)