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Bugfixing: Free form gourad triangle sampler

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Jakub Melka
2021-03-13 15:57:59 +01:00
parent 47bb1c3216
commit 995a3cdd7a
1 changed files with 9 additions and 4 deletions
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13
Pdf4QtLib/sources/pdfpattern.cpp
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@ -1998,8 +1998,7 @@ public:
for (const Triangle& triangle : m_triangles) for (const Triangle& triangle : m_triangles)
{ {
// Calculate barycentric coordinates // Calculate barycentric coordinates
QPointF p3 = m_vertices[triangle.vertexIndices[2]]; QPointF b1b2 = triangle.barycentricCoordinateMatrix.map(devicePoint);
QPointF b1b2 = triangle.barycentricCoordinateMatrix.map(devicePoint - p3);
const qreal b1 = b1b2.x(); const qreal b1 = b1b2.x();
const qreal b2 = b1b2.y(); const qreal b2 = b1b2.y();
@ -2086,7 +2085,7 @@ public:
QPointF p1p3 = p1 - p3; QPointF p1p3 = p1 - p3;
QPointF p2p3 = p2 - p3; QPointF p2p3 = p2 - p3;
QMatrix B(p1p3.x(), p2p3.x(), p1p3.y(), p2p3.y(), 0.0, 0.0); QMatrix B(p1p3.x(), p1p3.y(), p2p3.x(), p2p3.y(), 0.0, 0.0);
if (!B.isInvertible()) if (!B.isInvertible())
{ {
@ -2094,7 +2093,13 @@ public:
return; return;
} }
triangle.barycentricCoordinateMatrix = B.inverted(); // We precalculate B^-1 * (-p3), so we do not have it to compute it
// in each iteration.
QMatrix Binv = B.inverted();
QPointF pt = Binv.map(-p3);
Binv.setMatrix(Binv.m11(), Binv.m12(), Binv.m21(), Binv.m22(), pt.x(), pt.y());
triangle.barycentricCoordinateMatrix = Binv;
m_triangles.emplace_back(qMove(triangle)); m_triangles.emplace_back(qMove(triangle));
} }