Merge pull request #4137 from Tyriar/willReadFrequently

Optimize contexts for reading frequently
xtermjs · Sep 24, 2022 · b742da4 · b742da4
2 parents 1431210 + d62b453
commit b742da4
Show file tree

Hide file tree

Showing 2 changed files with 7 additions and 2 deletions.
diff --git a/addons/xterm-addon-webgl/src/atlas/WebglCharAtlas.ts b/addons/xterm-addon-webgl/src/atlas/WebglCharAtlas.ts
@@ -110,7 +110,10 @@ export class WebglCharAtlas implements IDisposable {
     this._tmpCanvas = document.createElement('canvas');
     this._tmpCanvas.width = this._config.scaledCellWidth * 4 + TMP_CANVAS_GLYPH_PADDING * 2;
     this._tmpCanvas.height = this._config.scaledCellHeight + TMP_CANVAS_GLYPH_PADDING * 2;
-    this._tmpCtx = throwIfFalsy(this._tmpCanvas.getContext('2d', { alpha: this._config.allowTransparency }));
+    this._tmpCtx = throwIfFalsy(this._tmpCanvas.getContext('2d', {
+      alpha: this._config.allowTransparency,
+      willReadFrequently: true
+    }));
   }
 
   public dispose(): void {

diff --git a/src/browser/ColorManager.ts b/src/browser/ColorManager.ts
@@ -89,7 +89,9 @@ export class ColorManager implements IColorManager {
     const canvas = document.createElement('canvas');
     canvas.width = 1;
     canvas.height = 1;
-    const ctx = canvas.getContext('2d');
+    const ctx = canvas.getContext('2d', {
+      willReadFrequently: true
+    });
     if (!ctx) {
       throw new Error('Could not get rendering context');
     }