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SvgLoader: Modify calculation formula of linear gradient matrix

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When there is a matrix of linear gradient, the applied formula is this.
= T(x - cx, y - cy) x g->transform x T(cx, cy)
This patch has modified this formula to work properly.
This commit is contained in:
JunsuChoi 2020-09-10 19:00:16 +09:00 • committed by Hermet Park
parent b1a91acd6a
commit eb64428bde
1 changed files with 5 additions and 15 deletions
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20
src/loaders/svg/tvgSvgSceneBuilder.cpp
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@ -69,24 +69,14 @@ unique_ptr<LinearGradient> _applyLinearGradientProperty(SvgStyleGradient* g, Sha
float cy = ((float) rh) * 0.5 + ry;
float cx = ((float) rw) * 0.5 + rx;
//Calc start point
//= T(x - cx, y - cy) x g->transform x T(cx, cy)
g->linear->x1 = cx * (g->transform->e11 + g->transform->e31 * (g->linear->x1 - cx)) +
cx * (g->transform->e12 + g->transform->e32 * (g->linear->x1 - cx)) +
cx * (g->transform->e13 + g->transform->e33 * (g->linear->x1 - cx));
g->linear->y1 = cy * (g->transform->e21 + g->transform->e31 * (g->linear->y1 - cy)) +
cy * (g->transform->e22 + g->transform->e32 * (g->linear->y1 - cy)) +
cy * (g->transform->e23 + g->transform->e33 * (g->linear->y1 - cy));
//Calc start point
g->linear->x1 = (g->transform->e11 * cx) + (g->transform->e12 * cy) + g->linear->x1 + g->transform->e13 - cx;
g->linear->y1 = (g->transform->e21 * cx) + (g->transform->e22 * cy) + g->linear->y1 + g->transform->e23 - cy;
//Calc end point
g->linear->x2 = cx * (g->transform->e11 + g->transform->e31 * (g->linear->x2 - cx)) +
cx * (g->transform->e12 + g->transform->e32 * (g->linear->x2 - cx)) +
cx * (g->transform->e13 + g->transform->e33 * (g->linear->x2 - cx));
g->linear->y2 = cy * (g->transform->e21 + g->transform->e31 * (g->linear->y2 - cy)) +
cy * (g->transform->e22 + g->transform->e32 * (g->linear->y2 - cy)) +
cy * (g->transform->e23 + g->transform->e33 * (g->linear->y2 - cy));
g->linear->x2 = (g->transform->e11 * cx) + (g->transform->e12 * cy) + g->linear->x2 + g->transform->e13 - cx;
g->linear->y2 = (g->transform->e21 * cx) + (g->transform->e22 * cy) + g->linear->y2 + g->transform->e23 - cy;
}
fillGrad->linear(g->linear->x1, g->linear->y1, g->linear->x2, g->linear->y2);