Function VerifyRectOffsetAlignment

src/video_frame.ts:719–741

(format: VideoPixelFormat | null, rect: DOMRectInit)

};

const VerifyRectOffsetAlignment = (format: VideoPixelFormat | null, rect: DOMRectInit): boolean => {
	// 1. If format is null, return true.
	if (format === null) return true;

	const info = getPixelFormatInfo(format);
	if (!info) return false;

	// 2. Let planeIndex be 0.
	// 3. Let numPlanes be the number of planes as defined by format.
	// 4. While planeIndex is less than numPlanes:
	for (let planeIndex = 0; planeIndex < info.planes.length; planeIndex++) {
		const plane = info.planes[planeIndex];
		const sampleWidth = plane.sampleWidth;
		const sampleHeight = plane.sampleHeight;

		// If rect.x is not a multiple of sampleWidth, return false.
		if ((rect.x || 0) % sampleWidth !== 0) return false;
		// If rect.y is not a multiple of sampleHeight, return false.
		if ((rect.y || 0) % sampleHeight !== 0) return false;
	}

	return true;
};

const ComputeLayoutAndAllocationSize = (
	parsedRect: DOMRectInit,