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Diffstat (limited to 'src/gui/image/qimage.cpp')
| -rw-r--r-- | src/gui/image/qimage.cpp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/gui/image/qimage.cpp b/src/gui/image/qimage.cpp index dc236e4..c7a20db 100644 --- a/src/gui/image/qimage.cpp +++ b/src/gui/image/qimage.cpp @@ -3607,6 +3607,9 @@ int QImage::pixelIndex(int x, int y) const If the \a position is not valid, the results are undefined. + \warning This function is expensive when used for massive pixel + manipulations. + \sa setPixel(), valid(), {QImage#Pixel Manipulation}{Pixel Manipulation} */ @@ -5581,6 +5584,8 @@ bool QImage::isDetached() const Use one of the composition mods in QPainter::CompositionMode instead. + \warning This function is expensive. + \sa alphaChannel(), {QImage#Image Transformations}{Image Transformations}, {QImage#Image Formats}{Image Formats} */ @@ -5663,6 +5668,11 @@ void QImage::setAlphaChannel(const QImage &alphaChannel) \l{QPixmap::}{alphaChannel()}, which works in the same way as this function on QPixmaps. + Most usecases for this function can be replaced with QPainter and + using composition modes. + + \warning This is an expensive function. + \sa setAlphaChannel(), hasAlphaChannel(), {QPixmap#Pixmap Information}{Pixmap}, {QImage#Image Transformations}{Image Transformations} |