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svgloader: fixing linear gradient transformation

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Gradient stop points were incorrectly transformed when building
the scene in the SVG loader.
This commit is contained in:
Mira Grudzinska 2021-03-04 01:07:42 +01:00 • committed by JunsuChoi
parent cb425fa4bb
commit a173b16ed5
1 changed files with 9 additions and 11 deletions
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18
src/loaders/svg/tvgSvgSceneBuilder.cpp
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@ -77,17 +77,15 @@ unique_ptr<LinearGradient> _applyLinearGradientProperty(SvgStyleGradient* g, con
}
if (g->transform) {
float cy = ((float) rh) * 0.5 + ry;
float cx = ((float) rw) * 0.5 + rx;
//Calc start point
auto x = g->linear->x1;
g->linear->x1 = x * g->transform->e11 + g->linear->y1 * g->transform->e12 + g->transform->e13;
g->linear->y1 = x * g->transform->e21 + g->linear->y1 * g->transform->e22 + g->transform->e23;
//= T(x - cx, y - cy) x g->transform x T(cx, 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 = (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;
//Calc end point
x = g->linear->x2;
g->linear->x2 = x * g->transform->e11 + g->linear->y2 * g->transform->e12 + g->transform->e13;
g->linear->y2 = x * g->transform->e21 + g->linear->y2 * g->transform->e22 + g->transform->e23;
}
fillGrad->linear(g->linear->x1, g->linear->y1, g->linear->x2, g->linear->y2);