X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/f35398824b11747a5930f729409b9fa59da3fad9..268766dd1f2a2d4d593d1d65893f62b5753ff20b:/docs/latex/wx/dc.tex diff --git a/docs/latex/wx/dc.tex b/docs/latex/wx/dc.tex index a090adaae7..95d44545be 100644 --- a/docs/latex/wx/dc.tex +++ b/docs/latex/wx/dc.tex @@ -61,11 +61,11 @@ released for each drawing operation. \func{bool}{Blit}{\param{wxCoord}{ xdest}, \param{wxCoord}{ ydest}, \param{wxCoord}{ width}, \param{wxCoord}{ height}, \param{wxDC* }{source}, \param{wxCoord}{ xsrc}, \param{wxCoord}{ ysrc}, \param{int}{ logicalFunc = wxCOPY}, - \param{bool }{useMask = FALSE}} + \param{bool }{useMask = FALSE}, \param{wxCoord}{ xsrcMask = -1}, \param{wxCoord}{ ysrcMask = -1}} Copy from a source DC to this DC, specifying the destination -coordinates, size of area to copy, source DC, source coordinates, and -logical function. +coordinates, size of area to copy, source DC, source coordinates, +logical function, whether to use a bitmap mask, and mask source position. \wxheading{Parameters} @@ -86,7 +86,7 @@ logical function. \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: +selected into the source device context. The Windows implementation does the following if MaskBlt cannot be used: \begin{enumerate} \item Creates a temporary bitmap and copies the destination area into it. @@ -103,8 +103,21 @@ and the background colour set to WHITE. 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 +wxWindows with the wxUSE\_DC\_CACHE option enabled. You can also influence whether 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. @@ -115,6 +128,24 @@ See \helpref{wxMemoryDC}{wxmemorydc} for typical usage. \helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxBitmap}{wxbitmap}, \helpref{wxMask}{wxmask} +\begin{comment} +\membersection{wxDC::CacheEnabled}\label{wxdccacheenabled} + +\func{static bool}{CacheEnabled}{\void} + +On supported platforms (currently only Windows), returns TRUE +if the DC cache is enabled. The DC cache +can speed up the \helpref{Blit}{wxdcblit} operation when +drawing a large number of masked bitmaps. + +If using the cache functions in your code, please test for the +wxUSE\_DC\_CACHEING preprocessor symbol for portability. + +\wxheading{See also} + +\helpref{wxDC::EnableCache}{wxdcenablecache}, \helpref{wxDC::ClearCache} +\end{comment} + \membersection{wxDC::CalcBoundingBox}\label{wxdccalcboundingbox} \func{void}{CalcBoundingBox}{\param{wxCoord }{x}, \param{wxCoord }{y}} @@ -133,6 +164,26 @@ Adds the specified point to the bounding box which can be retrieved with Clears the device context using the current background brush. +\begin{comment} +\membersection{wxDC::ClearCache}\label{wxdcclearcache} + +\func{static void}{ClearCache}{\void} + +On supported platforms (currently only Windows), clears +the contents of the DC cache (one bitmap and two Windows device contexts). The DC cache +can speed up the \helpref{Blit}{wxdcblit} operation when +drawing a large number of masked bitmaps. You should +call ClearCache at the end of length DC operations if you wish to only use +the cache transiently; you should also call it as your application exits. + +If using the cache functions in your code, please test for the +wxUSE\_DC\_CACHEING preprocessor symbol for portability. + +\wxheading{See also} + +\helpref{wxDC::EnableCache}{wxdcenablecache}, \helpref{wxDC::CacheEnabled} +\end{comment} + \membersection{wxDC::CrossHair}\label{wxdccrosshair} \func{void}{CrossHair}{\param{wxCoord}{ x}, \param{wxCoord}{ y}} @@ -313,6 +364,11 @@ for filling the shape. Draws the text rotated by {\it angle} degrees. +{\bf NB:} Under Win9x only TrueType fonts can be drawn by this function. In +particular, a font different from {\tt wxNORMAL\_FONT} should be used as the +latter is not a TrueType font. {\tt wxSWISS\_FONT} is an example of a font +which is. + \wxheading{See also} \helpref{DrawText}{wxdcdrawtext} @@ -370,6 +426,23 @@ text more precisely. but it is ignored by wxMSW. Thus, you should avoid using logical functions with this function in portable programs. +\begin{comment} +\membersection{wxDC::EnableCache}\label{wxdcenablecache} + +\func{static void}{EnableCache}{\param{bool}{ enableCache}} + +On supported platforms (currently only Windows), enables the DC cache +which can speed up the \helpref{Blit}{wxdcblit} operation when +drawing a large number of masked bitmaps. + +If using the cache functions in your code, please test for the +wxUSE\_DC\_CACHEING preprocessor symbol for portability. + +\wxheading{See also} + +\helpref{wxDC::CacheEnabled}{wxdccacheenabled}, \helpref{wxDC::ClearCache} +\end{comment} + \membersection{wxDC::EndDoc}\label{wxdcenddoc} \func{void}{EndDoc}{\void} @@ -870,3 +943,38 @@ Message is a message to show whilst printing. Starts a document page (only relevant when outputting to a printer). +\section{\class{wxDCClipper}}\label{wxdcclipper} + +This is a small helper class which sets the specified to its constructor +clipping region and then automatically destroyes it in its destructor. Using +it ensures that unwanted clipping region is not left set on the DC. + +\wxheading{Derived from} + +No base class + +\wxheading{Include files} + + + +\wxheading{See also} + +\helpref{wxDC}{wxdc} + +\latexignore{\rtfignore{\wxheading{Members}}} + +\membersection{wxDCClipper::wxDCClipper} + +\func{}{wxDCClipper}{\param{wxDC\& }{dc}, \param{wxCoord }{x},\param{wxCoord }{y},\param{wxCoord }{w},\param{wxCoord }{h},} + +\func{}{wxDCClipper}{\param{wxDC\& }{dc}, \param{const wxRect\&}{ rect}} + +Constructor: sets the the clipping region for the given device context to the +specified rectangle. + +\membersection{wxDCClipper::\destruct{wxDCClipper}} + +\func{}{\destruct{wxDCClipper}}{\void} + +Destructor: destroyes the clipping region set in the constructor. +