diff options
| -rw-r--r-- | src/gui/painting/qtransform.cpp | 29 | ||||
| -rw-r--r-- | src/gui/painting/qtransform.h | 8 |
2 files changed, 34 insertions, 3 deletions
diff --git a/src/gui/painting/qtransform.cpp b/src/gui/painting/qtransform.cpp index c120143..fa808d0 100644 --- a/src/gui/painting/qtransform.cpp +++ b/src/gui/painting/qtransform.cpp @@ -399,6 +399,9 @@ QTransform QTransform::inverted(bool *invertible) const */ QTransform & QTransform::translate(qreal dx, qreal dy) { + if (dx == 0 && dy == 0) + return *this; + switch(type()) { case TxNone: affine._dx = dx; @@ -435,7 +438,10 @@ QTransform & QTransform::translate(qreal dx, qreal dy) QTransform QTransform::fromTranslate(qreal dx, qreal dy) { QTransform transform(1, 0, 0, 1, dx, dy); - transform.m_dirty = TxTranslate; + if (dx == 0 && dy == 0) + transform.m_dirty = TxNone; + else + transform.m_dirty = TxTranslate; return transform; } @@ -447,6 +453,9 @@ QTransform QTransform::fromTranslate(qreal dx, qreal dy) */ QTransform & QTransform::scale(qreal sx, qreal sy) { + if (sx == 1 && sy == 1) + return *this; + switch(type()) { case TxNone: case TxTranslate: @@ -481,7 +490,10 @@ QTransform & QTransform::scale(qreal sx, qreal sy) QTransform QTransform::fromScale(qreal sx, qreal sy) { QTransform transform(sx, 0, 0, sy, 0, 0); - transform.m_dirty = TxScale; + if (sx == 1 && sy == 1) + transform.m_dirty = TxNone; + else + transform.m_dirty = TxScale; return transform; } @@ -544,6 +556,9 @@ const qreal inv_dist_to_plane = 1. / 1024.; */ QTransform & QTransform::rotate(qreal a, Qt::Axis axis) { + if (a == 0) + return *this; + qreal sina = 0; qreal cosa = 0; if (a == 90. || a == -270.) @@ -715,7 +730,15 @@ bool QTransform::operator!=(const QTransform &o) const */ QTransform & QTransform::operator*=(const QTransform &o) { - TransformationType t = qMax(type(), o.type()); + const TransformationType otherType = o.type(); + if (otherType == TxNone) + return *this; + + const TransformationType thisType = type(); + if (thisType == TxNone) + return operator=(o); + + TransformationType t = qMax(thisType, otherType); switch(t) { case TxNone: break; diff --git a/src/gui/painting/qtransform.h b/src/gui/painting/qtransform.h index de7ebcd..c76409b 100644 --- a/src/gui/painting/qtransform.h +++ b/src/gui/painting/qtransform.h @@ -257,6 +257,8 @@ inline qreal QTransform::dy() const inline QTransform &QTransform::operator*=(qreal num) { + if (num == 1.) + return *this; affine._m11 *= num; affine._m12 *= num; m_13 *= num; @@ -271,11 +273,15 @@ inline QTransform &QTransform::operator*=(qreal num) } inline QTransform &QTransform::operator/=(qreal div) { + if (div == 0) + return *this; div = 1/div; return operator*=(div); } inline QTransform &QTransform::operator+=(qreal num) { + if (num == 0) + return *this; affine._m11 += num; affine._m12 += num; m_13 += num; @@ -290,6 +296,8 @@ inline QTransform &QTransform::operator+=(qreal num) } inline QTransform &QTransform::operator-=(qreal num) { + if (num == 0) + return *this; affine._m11 -= num; affine._m12 -= num; m_13 -= num; |