The Problem
Detailed line art has thousands of small regions. A simple recursive fill is slow on full-screen images and can crash on large areas.
What We Built
Scanline flood fill. Rows are filled in one pass and neighbours go onto a linked-list stack, so big areas never overflow.
Tolerance. Anti-aliased line edges fill cleanly.
Tap mapping. The tap is mapped from the zoomable view to the bitmap pixel.
Palette. Preset colours plus a picker for custom colours.
A Note on the Image
Screens use the app's own line-art pictures and palette; the fill shown is illustrative.
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