src/vs/editor/browser/viewParts/minimap/minimap.ts/MinimapBuffers/constructor
class MinimapBuffers:	constructor(ctx: CanvasRenderingContext2D, WIDTH: number, HEIGHT: number, background: RGBA8) {
		this._backgroundFillData = MinimapBuffers._createBackgroundFillData(WIDTH, HEIGHT, background);
		this._buffers = [
			ctx.createImageData(WIDTH, HEIGHT),
			ctx.createImageData(WIDTH, HEIGHT)
		];
		this._lastUsedBuffer = 0;
	}