Function near_eq

tests/fl/gfx/blur.cpp:830–832

Helper: check two pixel values are within ±tolerance per channel.

// Helper: check two pixel values are within ±tolerance per channel.
static bool near_eq(uint8_t a, uint8_t b, int tol = 1) {
    return (a >= b ? a - b : b - a) <= tol;
}

FL_TEST_CASE("CanvasMapped non-rect matches Canvas within 1 LSB - R1") {
    const int W = 8, H = 8, N = W * H;