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wxDC::StretchBlit() for wxMac and wxMSW (patch 1611973)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44892 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2007-03-18 15:32:27 +00:00
parent fa3b08caf1
commit e3b81044ee
12 changed files with 347 additions and 100 deletions
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83
docs/latex/wx/dc.tex
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@@ -108,7 +108,7 @@ See \helpref{wxMemoryDC}{wxmemorydc} for typical usage.
\wxheading{See also}
\helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxBitmap}{wxbitmap}, \helpref{wxMask}{wxmask}
\helpref{wxDC::StretchBlit}{wxdcstretchblit}, \helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxBitmap}{wxbitmap}, \helpref{wxMask}{wxmask}
\begin{comment}
@@ -1198,3 +1198,84 @@ Message is a message to show while printing.
Starts a document page (only relevant when outputting to a printer).
\membersection{wxDC::StretchBlit}\label{wxdcstretchblit}
\func{bool}{StretchBlit}{\param{wxCoord}{ xdest}, \param{wxCoord}{ ydest}, \param{wxCoord}{ dstWidth}, \param{wxCoord}{ dstHeight},
\param{wxDC* }{source}, \param{wxCoord}{ xsrc}, \param{wxCoord}{ ysrc}, \param{wxCoord}{ srcWidth}, \param{wxCoord}{ srcHeight},
\param{int}{ logicalFunc = wxCOPY}, \param{bool }{useMask = false}, \param{wxCoord}{ xsrcMask = -1}, \param{wxCoord}{ ysrcMask = -1}}
Copy from a source DC to this DC, specifying the destination
coordinates, destination size, source DC, source coordinates,
size of source area to copy, logical function, whether to use a bitmap mask,
and mask source position.
\wxheading{Parameters}
\docparam{xdest}{Destination device context x position.}
\docparam{ydest}{Destination device context y position.}
\docparam{dstWidth}{Width of destination area.}
\docparam{dstHeight}{Height of destination area.}
\docparam{source}{Source device context.}
\docparam{xsrc}{Source device context x position.}
\docparam{ysrc}{Source device context y position.}
\docparam{srcWidth}{Width of source area to be copied.}
\docparam{srcHeight}{Height of source area to be copied.}
\docparam{logicalFunc}{Logical function to use: see \helpref{wxDC::SetLogicalFunction}{wxdcsetlogicalfunction}.}
\docparam{useMask}{If true, Blit does a transparent blit using the mask that is associated with the bitmap
selected into the source device context. The Windows implementation does the following if \texttt{MaskBlt} cannot be used:
\begin{enumerate}
\item Creates a temporary bitmap and copies the destination area into it.
\item Copies the source area into the temporary bitmap using the specified logical function.
\item Sets the masked area in the temporary bitmap to BLACK by ANDing the
mask bitmap with the temp bitmap with the foreground colour set to WHITE
and the background colour set to BLACK.
\item Sets the unmasked area in the destination area to BLACK by ANDing the
mask bitmap with the destination area with the foreground colour set to BLACK
and the background colour set to WHITE.
\item ORs the temporary bitmap with the destination area.
\item Deletes the temporary bitmap.
\end{enumerate}
This sequence of operations ensures that the source's transparent area need not be black,
and logical functions are supported.
{\bf Note:} on Windows, blitting with masks can be speeded up considerably by compiling
wxWidgets with the \texttt{wxUSE\_DC\_CACHE} option enabled. You can also influence whether \texttt{MaskBlt}
or the explicit mask blitting code above is used, by using \helpref{wxSystemOptions}{wxsystemoptions} and
setting the {\bf no-maskblt} option to 1.
}
\docparam{xsrcMask}{Source x position on the mask. If both xsrcMask and ysrcMask are -1, xsrc and ysrc
will be assumed for the mask source position. Currently only implemented on Windows.}
\docparam{ysrcMask}{Source y position on the mask. If both xsrcMask and ysrcMask are -1, xsrc and ysrc
will be assumed for the mask source position. Currently only implemented on Windows.}
\wxheading{Remarks}
There is partial support for Blit in wxPostScriptDC, under X.
wxDC::StretchBlit is only implemented under wxMAC and wxMSW.
See \helpref{wxMemoryDC}{wxmemorydc} for typical usage.
\newsince{2.9.0}
\wxheading{See also}
\helpref{wxDC::Blit}{wxdcblit}, \helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxBitmap}{wxbitmap}, \helpref{wxMask}{wxmask}