writePath method

void writePath({ required String windowId, required List<GlassPathCommand> commands, required List<double> points, required double windowHeight, int layerId = 0, })

Write raw path commands and points to the buffer.

This is the low-level API. For convenience, use GlassEffectService.

commands - List of path commands (moveTo, lineTo, etc.) points - Flat list of coordinates x0, y0, x1, y1, ... windowHeight - Height for Y-flip (Flutter Y=0 top, macOS Y=0 bottom)

Implementation

void writePath({
  required String windowId,
  required List<GlassPathCommand> commands,
  required List<double> points,
  required double windowHeight,
  int layerId = 0,
}) {
  final buffer = _buffers[windowId]?[layerId];
  if (buffer == null) return;

  final layerFrames = _frameIds.putIfAbsent(windowId, () => {});
  final frameId = (layerFrames[layerId] ?? 0) + 1;
  layerFrames[layerId] = frameId;

  // Signal write in progress
  buffer.ref.frameIdPost = frameId;

  buffer.ref.windowHeight = windowHeight;

  // Write commands (max 1024)
  final cmdCount = commands.length < 1024 ? commands.length : 1024;
  buffer.ref.commandCount = cmdCount;
  for (int i = 0; i < cmdCount; i++) {
    buffer.ref.commands[i] = commands[i].index;
  }

  // Write points (max 2048 floats = 1024 points)
  final ptCount = points.length < 2048 ? points.length : 2048;
  buffer.ref.pointCount = ptCount ~/ 2;
  for (int i = 0; i < ptCount; i++) {
    buffer.ref.points[i] = points[i];
  }

  // Signal write complete
  buffer.ref.frameId = frameId;
}