Large Scale Behaviour
The primary technique used to control a flood fill will either be data-centric or process-centric. A data-centric approach can use either a stack or a queue to keep track of seed pixels that need to be checked. A process-centric algorithm must necessarily use a stack.
A 4-way floodfill algorithm that uses the adjacency technique and a queue as its seed pixel store yields an expanding lozenge-shaped fill.
Efficiency: 4 pixels checked for each pixel filled (8 for an 8-way fill).
A 4-way floodfill algorithm that use the adjacency technique and a stack as its seed pixel store yields a linear fill with "gaps filled later" behaviour. This approach can be particularly seen in older 8-bit computer games, such as those created with Graphic Adventure Creator.
Efficiency: 4 pixels checked for each pixel filled (8 for an 8-way fill).
Read more about this topic: Flood Fill
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