getRenderedVideoContentBounds function

VideoContentBounds getRenderedVideoContentBounds({ required double containerWidth, required double containerHeight, required double videoWidth, required double videoHeight, })

Calculates the actual rendered video area inside a container, accounting for letterboxing (object-fit: contain equivalent).

Implementation

VideoContentBounds getRenderedVideoContentBounds({
  required double containerWidth,
  required double containerHeight,
  required double videoWidth,
  required double videoHeight,
}) {
  if (containerWidth <= 0 ||
      containerHeight <= 0 ||
      videoWidth <= 0 ||
      videoHeight <= 0) {
    return VideoContentBounds(
        left: 0, top: 0, width: containerWidth, height: containerHeight);
  }

  final containerAspect = containerWidth / containerHeight;
  final videoAspect = videoWidth / videoHeight;

  double renderWidth, renderHeight, offsetX, offsetY;

  if (containerAspect > videoAspect) {
    // Black bars on left and right
    renderHeight = containerHeight;
    renderWidth = containerHeight * videoAspect;
    offsetX = (containerWidth - renderWidth) / 2;
    offsetY = 0;
  } else {
    // Black bars on top and bottom
    renderWidth = containerWidth;
    renderHeight = containerWidth / videoAspect;
    offsetX = 0;
    offsetY = (containerHeight - renderHeight) / 2;
  }

  return VideoContentBounds(
    left: offsetX,
    top: offsetY,
    width: renderWidth,
    height: renderHeight,
  );
}