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Merge pull request #11255 from Shekenix/getDataAtPixel-improvement

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GetDataAtPixel performance improvement
This commit is contained in:
Andreas Hocevar
2020-07-07 23:40:04 +02:00
committed by GitHub
parent 8baf91bc0e a151d1b7a5
commit a2727ffe8f
1 changed files with 9 additions and 6 deletions
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src/ol/renderer/canvas/Layer.js
+9 -6
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@@ -282,12 +282,15 @@ class CanvasLayerRenderer extends LayerRenderer {
let data; let data;
try { try {
data = context.getImageData( const x = Math.round(renderPixel[0]);
Math.round(renderPixel[0]), const y = Math.round(renderPixel[1]);
Math.round(renderPixel[1]), const newCanvas = document.createElement('canvas');
1, const newContext = newCanvas.getContext('2d');
1 newCanvas.width = 1;
).data; 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) { } catch (err) {
if (err.name === 'SecurityError') { if (err.name === 'SecurityError') {
// tainted canvas, we assume there is data at the given pixel (although there might not be) // tainted canvas, we assume there is data at the given pixel (although there might not be)