Implement the copy-assignment operator inline, using the
copy-swap idiom. This makes assignment strongly exception
safe, but also simplifies maintainence, because op= is
formulated in terms of the copy constructor now.
Change-Id: I803c9100a520d659b685992237cb76fd114222c8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
The copy constructor used the default Private constructor,
followed by the application of the compiler-generated
copy assignment operator, and finally replaced the config
member with a copy of itself.
This is needlessly inefficient.
Worse: it's incorrect: if config->copy() throws, then
*d_ptr is leaked.
Solution: implement the copy constructor for Private,
and use it in the copy constructor of the public class.
Effect: everything that can throw now prevents the new
Private class from being created, and the compiler ends
up cleaning up after us.
Change-Id: I09ed18bb39ee7cd81aaa8ba01676fc202502a8e3
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
Implementated as in QPen etc.
Change-Id: Ia08551bf7902b60e115d1b1d2353030597e34841
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
QEasingCurve internally holds the spline data in a
QVector<QPointF>. For the return from cubicBezierSpline(),
the vector is transformed into a QList<QPointF>.
This involves copying, and into an inefficient (for QPointF
payloads) container at that, so deprecate cubicBezierSpline()
in favour of a new toCubicSpline() returning the QVector
directly.
Change-Id: Ie4827fe7c6e289ad97a0b09772e47298779c76ca
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
As in the past, to avoid rewriting various autotests that contain
line-number information, an extra blank line has been inserted at the
end of the license text to ensure that this commit does not change the
total number of lines in the license header.
Change-Id: I311e001373776812699d6efc045b5f742890c689
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
For -O2 gcc activates -fstrict-aliasing. As a result the compiler is
allowed to assume that pt[1]=px[1]/3+B1 does not affect t.
Therefore the result of _fast_cbrt() was always 0.
Using a union for casting avoids this issue.
For more details see:
http://labs.qt.nokia.com/2011/06/10/type-punning-and-strict-aliasing
Also the updated code respect endianness.
Change-Id: Id4bed16efac52e494e7357dc2f23f94e8c525df1
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
I added the possibilty to define Bezier/TCB splines and use them
as custom easing curves.
Note:
Splines have a parametric definition. This means we have a
function/polynom of t that evalutes to x and y. x/y = f(t).
For our purpose we actually need the function y = f(x).
So as a first step we have to solve the solution x = f(t) for a given
t and then in a second step we evaluate y = f(t).
f(t) is a cubic polynom so we use cardanos formula to solve this equation
directly.
For the casus irreducibilis we need 3 functions that are a combination of
arcos and cos. Instead of evaluating arcos and cos we approximate these
functions directly.
TCB splines are converted into the corresponding cubic bezier spline.
Change-Id: Id2afc15efac92e494d6358dc2e11f94e8c524da1
Reviewed-by: Aaron Kennedy <aaron.kennedy@nokia.com>
This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:
http://qt.gitorious.org/qt/pages/GitIntroductionWithQt
If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12
Marc Mutz
Jason McDonald
Thomas Hartmann
Jyri Tahtela
Qt by Nokia