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Issue #438: Add an IsRectilinear helper method to gfxMatrix.

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wolfbeast 2019-08-14 14:22:13 +02:00 • committed by Roy Tam
commit 0343460b3a
1 changed files with 12 additions and 0 deletions
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12
gfx/thebes/gfxMatrix.h
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@ -112,6 +112,18 @@ public:
_31 == 0.0 && _32 == 0.0;
}
/* Returns true if the matrix is a rectilinear transformation (i.e.
* grid-aligned rectangles are transformed to grid-aligned rectangles)
*/
bool IsRectilinear() const {
if (FuzzyEqual(_12, 0) && FuzzyEqual(_21, 0)) {
return true;
} else if (FuzzyEqual(_22, 0) && FuzzyEqual(_11, 0)) {
return true;
}
return false;
}
/**
* Inverts this matrix, if possible. Otherwise, the matrix is left
* unchanged.