Function transformRegionFromRoD

Engine/Transform.cpp:787–802

compute the bounding box of the transform of a rectangle

// compute the bounding box of the transform of a rectangle
void
transformRegionFromRoD(const RectD &srcRect,
                       const Matrix3x3 &transform,
                       RectD &dstRect)
{
    /// now transform the 4 corners of the source clip to the output image
    Point3D p[4];

    p[0] = matApply( transform, Point3D(srcRect.x1, srcRect.y1, 1) );
    p[1] = matApply( transform, Point3D(srcRect.x1, srcRect.y2, 1) );
    p[2] = matApply( transform, Point3D(srcRect.x2, srcRect.y2, 1) );
    p[3] = matApply( transform, Point3D(srcRect.x2, srcRect.y1, 1) );


    transformRegionFromPoints(p, dstRect);
}
} //namespace Transform
NATRON_NAMESPACE_EXIT