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sw_engine: fix radial coefficients calculations

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In the Taylor series expansion, there was a missing
division by 2! in the term with the second derivative.

@Issue: https://github.com/thorvg/thorvg/issues/2530
This commit is contained in:
Mira Grudzinska 2024-07-27 01:07:25 +02:00 • committed by Hermet Park
parent 356b813f79
commit dcc8a1d042
1 changed files with 1 additions and 1 deletions
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2
src/renderer/sw_engine/tvgSwFill.cpp
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@ -58,7 +58,7 @@ static void _calculateCoefficients(const SwFill* fill, uint32_t x, uint32_t y, f
auto deltaDeltaRr = 2.0f * (radial->a11 * radial->a11 + radial->a21 * radial->a21) * radial->invA;
det = b * b + (rr - radial->fr * radial->fr) * radial->invA;
deltaDet = 2.0f * b * deltaB + deltaB * deltaB + deltaRr + deltaDeltaRr;
deltaDet = 2.0f * b * deltaB + deltaB * deltaB + deltaRr + deltaDeltaRr * 0.5f;
deltaDeltaDet = 2.0f * deltaB * deltaB + deltaDeltaRr;
}