src/vs/editor/browser/viewParts/minimap/minimap.ts/MinimapBuffers/getBuffer
class MinimapBuffers:	public getBuffer(): ImageData {
		// rotate buffers
		this._lastUsedBuffer = 1 - this._lastUsedBuffer;
		const result = this._buffers[this._lastUsedBuffer];

		// fill with background color
		result.data.set(this._backgroundFillData);

		return result;
	}