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wasm: improved bounds calculation (#795)

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Improved bounds calculation in case a rotation is applied
This commit is contained in:
Michal Maciola 2021-09-10 13:26:58 +02:00 • committed by GitHub
parent 8c2e762e98
commit e62f8a0db4
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 20 additions and 13 deletions
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23
src/wasm/thorvgwasm.cpp
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@ -179,19 +179,26 @@ public:
if (!paint) return val(typed_memory_view<float>(0, nullptr));
paint->bounds(&mBounds[0], &mBounds[1], &mBounds[2], &mBounds[3]);
mBounds[2] += mBounds[0];
mBounds[3] += mBounds[1];
float points[8] = { //clockwise points
mBounds[0], mBounds[1], //(x1, y1)
mBounds[0] + mBounds[2], mBounds[1], //(x2, y1)
mBounds[0] + mBounds[2], mBounds[1] + mBounds[3], //(x2, y2)
mBounds[0], mBounds[1] + mBounds[3], //(x1, y2)
};
for (auto paint = parents.data; paint < (parents.data + parents.count); ++paint) {
auto m = const_cast<Paint*>(*paint)->transform();
mBounds[0] = mBounds[0] * m.e11 + m.e13;
mBounds[1] = mBounds[1] * m.e22 + m.e23;
mBounds[2] = mBounds[2] * m.e11 + m.e13;
mBounds[3] = mBounds[3] * m.e22 + m.e23;
for (int i = 0; i<8; i += 2) {
float x = points[i] * m.e11 + points[i+1] * m.e12 + m.e13;
points[i+1] = points[i] * m.e21 + points[i+1] * m.e22 + m.e23;
points[i] = x;
}
}
mBounds[2] -= mBounds[0];
mBounds[3] -= mBounds[1];
mBounds[0] = points[0];//x(p1)
mBounds[1] = points[3];//y(p2)
mBounds[2] = points[4] - mBounds[0];//x(p3)
mBounds[3] = points[7] - mBounds[1];//y(p4)
return val(typed_memory_view(4, mBounds));
}