Display problem when two rectangles are close to each other

Nobody has claimed this yet.

for (var i = 0u; i < PIXELS_PER_THREAD; i += 1u) {
let i_f = f32(i);
let xmin = min(xmin0 - i_f, 1.0) - 1.0e-6;
let xmax = xmax0 - i_f;
let b = min(xmax, 1.0);
let c = max(b, 0.0);
let d = max(xmin, 0.0);
**_let a = (b + 0.5 * (d * d - c * c) - xmin) / (xmax - xmin);_**
area[i] += a * dy;
}
What is the purpose of x squared minus x squared in this code at the end of fine.wgsl? Suppose I have two rectangles, one is at position (0,0) with width and height of (100,100), and the other is at position (100,100) , the width and height are (200,200). Now we find that if we want to subtract c square from d square, there will be a gap between them. If we remove it, there will be no gap. Can it be removed please? Is there any other way to solve it?

Start in fine.wgsl at the highlighted calculation and trace how a, b, c, and d contribute to area. Reproduce the adjacent-rectangle example from the issue, then compare the rendered result with and without the squared terms. Done means the gap is resolved without breaking area coverage for other rectangle layouts.

Written by the indexing model from the issue text.