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diff --git a/doc/html/qpixmap.html b/doc/html/qpixmap.html new file mode 100644 index 000000000..2490a8d31 --- /dev/null +++ b/doc/html/qpixmap.html @@ -0,0 +1,825 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qpixmap.cpp:53 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>TQPixmap Class</title> +<style type="text/css"><!-- +fn { margin-left: 1cm; text-indent: -1cm; } +a:link { color: #004faf; text-decoration: none } +a:visited { color: #672967; text-decoration: none } +body { background: #ffffff; color: black; } +--></style> +</head> +<body> + +<table border="0" cellpadding="0" cellspacing="0" width="100%"> +<tr bgcolor="#E5E5E5"> +<td valign=center> + <a href="index.html"> +<font color="#004faf">Home</font></a> + | <a href="classes.html"> +<font color="#004faf">All Classes</font></a> + | <a href="mainclasses.html"> +<font color="#004faf">Main Classes</font></a> + | <a href="annotated.html"> +<font color="#004faf">Annotated</font></a> + | <a href="groups.html"> +<font color="#004faf">Grouped Classes</font></a> + | <a href="functions.html"> +<font color="#004faf">Functions</font></a> +</td> +<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQPixmap Class Reference</h1> + +<p>The TQPixmap class is an off-screen, pixel-based paint device. +<a href="#details">More...</a> +<p><tt>#include <<a href="qpixmap-h.html">qpixmap.h</a>></tt> +<p>Inherits <a href="qpaintdevice.html">TQPaintDevice</a> and <a href="qt.html">TQt</a>. +<p>Inherited by <a href="qbitmap.html">TQBitmap</a> and <a href="qcanvaspixmap.html">TQCanvasPixmap</a>. +<p><a href="qpixmap-members.html">List of all member functions.</a> +<h2>Public Members</h2> +<ul> +<li class=fn>enum <a href="#ColorMode-enum"><b>ColorMode</b></a> { Auto, Color, Mono }</li> +<li class=fn>enum <a href="#Optimization-enum"><b>Optimization</b></a> { DefaultOptim, NoOptim, MemoryOptim = NoOptim, NormalOptim, BestOptim }</li> +<li class=fn><a href="#TQPixmap"><b>TQPixmap</b></a> ()</li> +<li class=fn><a href="#TQPixmap-2"><b>TQPixmap</b></a> ( const TQImage & image )</li> +<li class=fn><a href="#TQPixmap-3"><b>TQPixmap</b></a> ( int w, int h, int depth = -1, Optimization optimization = DefaultOptim )</li> +<li class=fn><a href="#TQPixmap-4"><b>TQPixmap</b></a> ( const TQSize & size, int depth = -1, Optimization optimization = DefaultOptim )</li> +<li class=fn><a href="#TQPixmap-5"><b>TQPixmap</b></a> ( const TQString & fileName, const char * format = 0, ColorMode mode = Auto )</li> +<li class=fn><a href="#TQPixmap-6"><b>TQPixmap</b></a> ( const TQString & fileName, const char * format, int conversion_flags )</li> +<li class=fn><a href="#TQPixmap-7"><b>TQPixmap</b></a> ( const char * xpm[] )</li> +<li class=fn><a href="#TQPixmap-8"><b>TQPixmap</b></a> ( const TQByteArray & img_data )</li> +<li class=fn><a href="#TQPixmap-9"><b>TQPixmap</b></a> ( const TQPixmap & pixmap )</li> +<li class=fn><a href="#~TQPixmap"><b>~TQPixmap</b></a> ()</li> +<li class=fn>TQPixmap & <a href="#operator-eq"><b>operator=</b></a> ( const TQPixmap & pixmap )</li> +<li class=fn>TQPixmap & <a href="#operator-eq-2"><b>operator=</b></a> ( const TQImage & image )</li> +<li class=fn>bool <a href="#isNull"><b>isNull</b></a> () const</li> +<li class=fn>int <a href="#width"><b>width</b></a> () const</li> +<li class=fn>int <a href="#height"><b>height</b></a> () const</li> +<li class=fn>TQSize <a href="#size"><b>size</b></a> () const</li> +<li class=fn>TQRect <a href="#rect"><b>rect</b></a> () const</li> +<li class=fn>int <a href="#depth"><b>depth</b></a> () const</li> +<li class=fn>void <a href="#fill"><b>fill</b></a> ( const TQColor & fillColor = TQt::white )</li> +<li class=fn>void <a href="#fill-2"><b>fill</b></a> ( const TQWidget * widget, int xofs, int yofs )</li> +<li class=fn>void <a href="#fill-3"><b>fill</b></a> ( const TQWidget * widget, const TQPoint & ofs )</li> +<li class=fn>void <a href="#resize"><b>resize</b></a> ( int w, int h )</li> +<li class=fn>void <a href="#resize-2"><b>resize</b></a> ( const TQSize & size )</li> +<li class=fn>const TQBitmap * <a href="#mask"><b>mask</b></a> () const</li> +<li class=fn>void <a href="#setMask"><b>setMask</b></a> ( const TQBitmap & newmask )</li> +<li class=fn>bool <a href="#selfMask"><b>selfMask</b></a> () const</li> +<li class=fn>bool <a href="#hasAlpha"><b>hasAlpha</b></a> () const</li> +<li class=fn>bool <a href="#hasAlphaChannel"><b>hasAlphaChannel</b></a> () const</li> +<li class=fn>TQBitmap <a href="#createHeuristicMask"><b>createHeuristicMask</b></a> ( bool clipTight = TRUE ) const</li> +<li class=fn>TQPixmap <a href="#xForm"><b>xForm</b></a> ( const TQWMatrix & matrix ) const</li> +<li class=fn>TQImage <a href="#convertToImage"><b>convertToImage</b></a> () const</li> +<li class=fn>bool <a href="#convertFromImage-2"><b>convertFromImage</b></a> ( const TQImage & image, ColorMode mode = Auto )</li> +<li class=fn>bool <a href="#convertFromImage"><b>convertFromImage</b></a> ( const TQImage & img, int conversion_flags )</li> +<li class=fn>bool <a href="#load-2"><b>load</b></a> ( const TQString & fileName, const char * format = 0, ColorMode mode = Auto )</li> +<li class=fn>bool <a href="#load"><b>load</b></a> ( const TQString & fileName, const char * format, int conversion_flags )</li> +<li class=fn>bool <a href="#loadFromData-2"><b>loadFromData</b></a> ( const uchar * buf, uint len, const char * format = 0, ColorMode mode = Auto )</li> +<li class=fn>bool <a href="#loadFromData"><b>loadFromData</b></a> ( const uchar * buf, uint len, const char * format, int conversion_flags )</li> +<li class=fn>bool <a href="#loadFromData-3"><b>loadFromData</b></a> ( const TQByteArray & buf, const char * format = 0, int conversion_flags = 0 )</li> +<li class=fn>bool <a href="#save"><b>save</b></a> ( const TQString & fileName, const char * format, int quality = -1 ) const</li> +<li class=fn>bool <a href="#save-2"><b>save</b></a> ( TQIODevice * device, const char * format, int quality = -1 ) const</li> +<li class=fn>int <a href="#serialNumber"><b>serialNumber</b></a> () const</li> +<li class=fn>Optimization <a href="#optimization"><b>optimization</b></a> () const</li> +<li class=fn>void <a href="#setOptimization"><b>setOptimization</b></a> ( Optimization optimization )</li> +<li class=fn>virtual void <a href="#detach"><b>detach</b></a> ()</li> +<li class=fn>bool <a href="#isTQBitmap"><b>isTQBitmap</b></a> () const</li> +</ul> +<h2>Static Public Members</h2> +<ul> +<li class=fn>int <a href="#defaultDepth"><b>defaultDepth</b></a> ()</li> +<li class=fn>TQPixmap <a href="#fromMimeSource"><b>fromMimeSource</b></a> ( const TQString & abs_name )</li> +<li class=fn>TQPixmap <a href="#grabWindow"><b>grabWindow</b></a> ( WId window, int x = 0, int y = 0, int w = -1, int h = -1 )</li> +<li class=fn>TQPixmap <a href="#grabWidget"><b>grabWidget</b></a> ( TQWidget * widget, int x = 0, int y = 0, int w = -1, int h = -1 )</li> +<li class=fn>TQWMatrix <a href="#trueMatrix"><b>trueMatrix</b></a> ( const TQWMatrix & matrix, int w, int h )</li> +<li class=fn>const char * <a href="#imageFormat"><b>imageFormat</b></a> ( const TQString & fileName )</li> +<li class=fn>Optimization <a href="#defaultOptimization"><b>defaultOptimization</b></a> ()</li> +<li class=fn>void <a href="#setDefaultOptimization"><b>setDefaultOptimization</b></a> ( Optimization optimization )</li> +</ul> +<h2>Protected Members</h2> +<ul> +<li class=fn><a href="#TQPixmap-a"><b>TQPixmap</b></a> ( int w, int h, const uchar * bits, bool isXbitmap )</li> +<li class=fn>virtual int <a href="#metric"><b>metric</b></a> ( int m ) const</li> +</ul> +<h2>Related Functions</h2> +<ul> +<li class=fn>TQDataStream & <a href="#operator-lt-lt"><b>operator<<</b></a> ( TQDataStream & s, const TQPixmap & pixmap )</li> +<li class=fn>TQDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( TQDataStream & s, TQPixmap & pixmap )</li> +<li class=fn>void <a href="#copyBlt"><b>copyBlt</b></a> ( TQPixmap * dst, int dx, int dy, const TQPixmap * src, int sx, int sy, int sw, int sh )</li> +</ul> +<hr><a name="details"></a><h2>Detailed Description</h2> + + +The TQPixmap class is an off-screen, pixel-based paint device. +<p> + + + +<p> TQPixmap is one of the two classes TQt provides for dealing with +images; the other is <a href="qimage.html">TQImage</a>. TQPixmap is designed and optimized +for drawing; TQImage is designed and optimized for I/O and for +direct pixel access/manipulation. There are (slow) functions to +convert between TQImage and TQPixmap: <a href="#convertToImage">convertToImage</a>() and +<a href="#convertFromImage">convertFromImage</a>(). +<p> One common use of the TQPixmap class is to enable smooth updating +of widgets. Whenever something complex needs to be drawn, you can +use a pixmap to obtain flicker-free drawing, like this: +<p> <ol type=1> +<li> Create a pixmap with the same size as the widget. +<li> Fill the pixmap with the widget background color. +<li> Paint the pixmap. +<li> <a href="qpaintdevice.html#bitBlt">bitBlt</a>() the pixmap contents onto the widget. +</ol> +<p> Pixel data in a pixmap is internal and is managed by the +underlying window system. Pixels can be accessed only through +<a href="qpainter.html">TQPainter</a> functions, through bitBlt(), and by converting the +TQPixmap to a TQImage. +<p> You can easily display a TQPixmap on the screen using +<a href="qlabel.html#setPixmap">TQLabel::setPixmap</a>(). For example, all the <a href="qbutton.html">TQButton</a> subclasses +support pixmap use. +<p> The TQPixmap class uses <a href="shclass.html">copy-on-write</a>, +so it is practical to pass TQPixmap objects by value. +<p> You can retrieve the <a href="#width">width</a>(), <a href="#height">height</a>(), <a href="#depth">depth</a>() and <a href="#size">size</a>() of a +pixmap. The enclosing rectangle is given by <a href="#rect">rect</a>(). Pixmaps can be +filled with <a href="#fill">fill</a>() and resized with <a href="#resize">resize</a>(). You can create and +set a mask with <a href="#createHeuristicMask">createHeuristicMask</a>() and <a href="#setMask">setMask</a>(). Use +<a href="#selfMask">selfMask</a>() to see if the pixmap is identical to its mask. +<p> In addition to loading a pixmap from file using <a href="#load">load</a>() you can +also <a href="#loadFromData">loadFromData</a>(). You can control optimization with +<a href="#setOptimization">setOptimization</a>() and obtain a transformed version of the pixmap +using <a href="#xForm">xForm</a>() +<p> Note regarding Windows 95 and 98: on Windows 9x the system crashes +if you create more than about 1000 pixmaps, independent of the +size of the pixmaps or installed RAM. Windows NT-systems (including +2000, XP and following versions) do not have the same limitation, +but depending on the graphics etquipment the system will fail to +allocate pixmap objects at some point (due to system running out of +GDI resources). +<p> TQt tries to work around the resource limitation. If you set the +pixmap optimization to <a href="#Optimization-enum">TQPixmap::MemoryOptim</a> and the width of +your pixmap is less than or equal to 128 pixels, TQt stores the +pixmap in a way that is very memory-efficient when there are many +pixmaps. +<p> If your application uses dozens or hundreds of pixmaps (for +example on tool bar buttons and in popup menus), and you plan to +run it on Windows 95 or Windows 98, we recommend using code like +this: +<p> <pre> + TQPixmap::<a href="#setDefaultOptimization">setDefaultOptimization</a>( TQPixmap::<a href="#Optimization-enum">MemoryOptim</a> ); + while ( ... ) { + // load tool bar pixmaps etc. + TQPixmap *pixmap = new TQPixmap(fileName); + } + TQPixmap::<a href="#setDefaultOptimization">setDefaultOptimization</a>( TQPixmap::<a href="#Optimization-enum">NormalOptim</a> ); + </pre> + +<p> In general it is recommended to make as much use of TQPixmap's +<a href="shclass.html#implicit-sharing">implicit sharing</a> and the <a href="qpixmapcache.html">TQPixmapCache</a> as possible. +<p> <p>See also <a href="qbitmap.html">TQBitmap</a>, <a href="qimage.html">TQImage</a>, <a href="qimageio.html">TQImageIO</a>, <a href="shclass.html">Shared Classes</a>, <a href="graphics.html">Graphics Classes</a>, <a href="images.html">Image Processing Classes</a>, and <a href="shared.html">Implicitly and Explicitly Shared Classes</a>. + +<hr><h2>Member Type Documentation</h2> +<h3 class=fn><a name="ColorMode-enum"></a>TQPixmap::ColorMode</h3> + +<p> This enum type defines the color modes that exist for converting +<a href="qimage.html">TQImage</a> objects to TQPixmap. +<ul> +<li><tt>TQPixmap::Auto</tt> - Select <a href="#ColorMode-enum">Color</a> or <a href="#ColorMode-enum">Mono</a> on a case-by-case basis. +<li><tt>TQPixmap::Color</tt> - Always create colored pixmaps. +<li><tt>TQPixmap::Mono</tt> - Always create bitmaps. +</ul> +<h3 class=fn><a name="Optimization-enum"></a>TQPixmap::Optimization</h3> + +<p> TQPixmap has the choice of optimizing for speed or memory in a few +places; the best choice varies from pixmap to pixmap but can +generally be derived heuristically. This enum type defines a +number of optimization modes that you can set for any pixmap to +tweak the speed/memory tradeoffs: +<ul> +<li><tt>TQPixmap::DefaultOptim</tt> - Whatever <a href="#defaultOptimization">TQPixmap::defaultOptimization</a>() +returns. A pixmap with this optimization will have whatever +the current default optimization is. If the default +optimization is changed using <a href="#setDefaultOptimization">setDefaultOptimization</a>(), then +this will not effect any pixmaps that have already been +created. +<li><tt>TQPixmap::NoOptim</tt> - No optimization (currently the same as <a href="#Optimization-enum">MemoryOptim</a>). +<li><tt>TQPixmap::MemoryOptim</tt> - Optimize for minimal memory use on Windows +9x and X11 systems. +<li><tt>TQPixmap::NormalOptim</tt> - Optimize for typical usage. Often uses more +memory than <a href="#Optimization-enum">MemoryOptim</a>, and is often faster. +<li><tt>TQPixmap::BestOptim</tt> - Optimize for pixmaps that are drawn very often +and where performance is critical. Generally uses more memory +than <a href="#Optimization-enum">NormalOptim</a> and may provide a little more speed. +</ul><p> We recommend using <a href="#Optimization-enum">DefaultOptim</a>. +<p> +<hr><h2>Member Function Documentation</h2> +<h3 class=fn><a name="TQPixmap"></a>TQPixmap::TQPixmap () +</h3> +Constructs a null pixmap. +<p> <p>See also <a href="#isNull">isNull</a>(). + +<h3 class=fn><a name="TQPixmap-2"></a>TQPixmap::TQPixmap ( const <a href="qimage.html">TQImage</a> & image ) +</h3> +Constructs a pixmap from the <a href="qimage.html">TQImage</a> <em>image</em>. +<p> <p>See also <a href="#convertFromImage">convertFromImage</a>(). + +<h3 class=fn><a name="TQPixmap-3"></a>TQPixmap::TQPixmap ( int w, int h, int depth = -1, <a href="qpixmap.html#Optimization-enum">Optimization</a> optimization = DefaultOptim ) +</h3> +Constructs a pixmap with <em>w</em> width, <em>h</em> height and <em>depth</em> bits +per pixel. The pixmap is optimized in accordance with the <em>optimization</em> value. +<p> The contents of the pixmap is uninitialized. +<p> The <em>depth</em> can be either 1 (monochrome) or the depth of the +current video mode. If <em>depth</em> is negative, then the hardware +depth of the current video mode will be used. +<p> If either <em>w</em> or <em>h</em> is zero, a null pixmap is constructed. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#Optimization-enum">TQPixmap::Optimization</a>. + +<h3 class=fn><a name="TQPixmap-4"></a>TQPixmap::TQPixmap ( const <a href="qsize.html">TQSize</a> & size, int depth = -1, <a href="qpixmap.html#Optimization-enum">Optimization</a> optimization = DefaultOptim ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Constructs a pixmap of size <em>size</em>, <em>depth</em> bits per pixel, +optimized in accordance with the <em>optimization</em> value. + +<h3 class=fn><a name="TQPixmap-5"></a>TQPixmap::TQPixmap ( const <a href="qstring.html">TQString</a> & fileName, const char * format = 0, <a href="qpixmap.html#ColorMode-enum">ColorMode</a> mode = Auto ) +</h3> +Constructs a pixmap from the file <em>fileName</em>. If the file does +not exist or is of an unknown format, the pixmap becomes a null +pixmap. +<p> The <em>fileName</em>, <em>format</em> and <em>mode</em> parameters are passed on to +<a href="#load">load</a>(). This means that the data in <em>fileName</em> is not compiled +into the binary. If <em>fileName</em> contains a relative path (e.g. the +filename only) the relevant file must be found relative to the +runtime working directory. +<p> <p>See also <a href="#ColorMode-enum">TQPixmap::ColorMode</a>, <a href="#isNull">isNull</a>(), <a href="#load">load</a>(), <a href="#loadFromData">loadFromData</a>(), <a href="#save">save</a>(), and <a href="#imageFormat">imageFormat</a>(). + +<h3 class=fn><a name="TQPixmap-6"></a>TQPixmap::TQPixmap ( const <a href="qstring.html">TQString</a> & fileName, const char * format, int conversion_flags ) +</h3> +Constructs a pixmap from the file <em>fileName</em>. If the file does +not exist or is of an unknown format, the pixmap becomes a null +pixmap. +<p> The <em>fileName</em>, <em>format</em> and <em>conversion_flags</em> parameters are +passed on to <a href="#load">load</a>(). This means that the data in <em>fileName</em> is +not compiled into the binary. If <em>fileName</em> contains a relative +path (e.g. the filename only) the relevant file must be found +relative to the runtime working directory. +<p> If the image needs to be modified to fit in a lower-resolution +result (e.g. converting from 32-bit to 8-bit), use the <em>conversion_flags</em> to specify how you'd prefer this to happen. +<p> <p>See also <a href="qt.html#ImageConversionFlags-enum">TQt::ImageConversionFlags</a>, <a href="#isNull">isNull</a>(), <a href="#load">load</a>(), <a href="#loadFromData">loadFromData</a>(), <a href="#save">save</a>(), and <a href="#imageFormat">imageFormat</a>(). + +<h3 class=fn><a name="TQPixmap-7"></a>TQPixmap::TQPixmap ( const char * xpm[] ) +</h3> +Constructs a pixmap from <em>xpm</em>, which must be a valid XPM image. +<p> Errors are silently ignored. +<p> Note that it's possible to squeeze the XPM variable a little bit +by using an unusual declaration: +<p> <pre> + static const char * const start_xpm[]={ + "16 15 8 1", + "a c #cec6bd", + .... + </pre> + +<p> The extra <tt>const</tt> makes the entire definition read-only, which is +slightly more efficient (for example, when the code is in a shared +library) and ROMable when the application is to be stored in ROM. +<p> In order to use that sort of declaration you must cast the +variable back to <tt>const char **</tt> when you create the TQPixmap. + +<h3 class=fn><a name="TQPixmap-8"></a>TQPixmap::TQPixmap ( const <a href="qbytearray.html">TQByteArray</a> & img_data ) +</h3> +Constructs a pixmaps by loading from <em>img_data</em>. The data can be +in any image format supported by TQt. +<p> <p>See also <a href="#loadFromData">loadFromData</a>(). + +<h3 class=fn><a name="TQPixmap-9"></a>TQPixmap::TQPixmap ( const <a href="qpixmap.html">TQPixmap</a> & pixmap ) +</h3> +Constructs a pixmap that is a copy of <em>pixmap</em>. + +<h3 class=fn><a name="TQPixmap-a"></a>TQPixmap::TQPixmap ( int w, int h, const uchar * bits, bool isXbitmap )<tt> [protected]</tt> +</h3> +Constructs a monochrome pixmap, with width <em>w</em> and height <em>h</em>, +that is initialized with the data in <em>bits</em>. The <em>isXbitmap</em> +indicates whether the data is an X bitmap and defaults to FALSE. +This constructor is protected and used by the <a href="qbitmap.html">TQBitmap</a> class. + +<h3 class=fn><a name="~TQPixmap"></a>TQPixmap::~TQPixmap () +</h3> +Destroys the pixmap. + +<h3 class=fn>bool <a name="convertFromImage"></a>TQPixmap::convertFromImage ( const <a href="qimage.html">TQImage</a> & img, int conversion_flags ) +</h3> +Converts image <em>img</em> and sets this pixmap. Returns TRUE if +successful; otherwise returns FALSE. +<p> The <em>conversion_flags</em> argument is a bitwise-OR of the +<a href="qt.html#ImageConversionFlags-enum">TQt::ImageConversionFlags</a>. Passing 0 for <em>conversion_flags</em> +sets all the default options. +<p> Note that even though a TQPixmap with depth 1 behaves much like a +<a href="qbitmap.html">TQBitmap</a>, <a href="#isTQBitmap">isTQBitmap</a>() returns FALSE. +<p> If a pixmap with depth 1 is painted with color0 and color1 and +converted to an image, the pixels painted with color0 will produce +pixel index 0 in the image and those painted with color1 will +produce pixel index 1. +<p> <p>See also <a href="#convertToImage">convertToImage</a>(), <a href="#isTQBitmap">isTQBitmap</a>(), <a href="qimage.html#convertDepth">TQImage::convertDepth</a>(), <a href="#defaultDepth">defaultDepth</a>(), and <a href="qimage.html#hasAlphaBuffer">TQImage::hasAlphaBuffer</a>(). + +<p>Examples: <a href="canvas-example.html#x2943">canvas/canvas.cpp</a> and <a href="themes-example.html#x228">themes/wood.cpp</a>. +<h3 class=fn>bool <a name="convertFromImage-2"></a>TQPixmap::convertFromImage ( const <a href="qimage.html">TQImage</a> & image, <a href="qpixmap.html#ColorMode-enum">ColorMode</a> mode = Auto ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Converts <em>image</em> and sets this pixmap using color mode <em>mode</em>. +Returns TRUE if successful; otherwise returns FALSE. +<p> <p>See also <a href="#ColorMode-enum">TQPixmap::ColorMode</a>. + +<h3 class=fn><a href="qimage.html">TQImage</a> <a name="convertToImage"></a>TQPixmap::convertToImage () const +</h3> +Converts the pixmap to a <a href="qimage.html">TQImage</a>. Returns a null image if it fails. +<p> If the pixmap has 1-bit depth, the returned image will also be 1 +bit deep. If the pixmap has 2- to 8-bit depth, the returned image +has 8-bit depth. If the pixmap has greater than 8-bit depth, the +returned image has 32-bit depth. +<p> Note that for the moment, alpha masks on monochrome images are +ignored. +<p> <p>See also <a href="#convertFromImage">convertFromImage</a>(). + +<p>Example: <a href="qmag-example.html#x1783">qmag/qmag.cpp</a>. +<h3 class=fn><a href="qbitmap.html">TQBitmap</a> <a name="createHeuristicMask"></a>TQPixmap::createHeuristicMask ( bool clipTight = TRUE ) const +</h3> +Creates and returns a heuristic mask for this pixmap. It works by +selecting a color from one of the corners and then chipping away +pixels of that color, starting at all the edges. +<p> The mask may not be perfect but it should be reasonable, so you +can do things such as the following: +<pre> + pm->setMask( pm->createHeuristicMask() ); + </pre> + +<p> This function is slow because it involves transformation to a +<a href="qimage.html">TQImage</a>, non-trivial computations and a transformation back to a +<a href="qbitmap.html">TQBitmap</a>. +<p> If <em>clipTight</em> is TRUE the mask is just large enough to cover the +pixels; otherwise, the mask is larger than the data pixels. +<p> <p>See also <a href="qimage.html#createHeuristicMask">TQImage::createHeuristicMask</a>(). + +<h3 class=fn>int <a name="defaultDepth"></a>TQPixmap::defaultDepth ()<tt> [static]</tt> +</h3> +Returns the default pixmap depth, i.e. the depth a pixmap gets if +-1 is specified. +<p> <p>See also <a href="#depth">depth</a>(). + +<h3 class=fn><a href="qpixmap.html#Optimization-enum">Optimization</a> <a name="defaultOptimization"></a>TQPixmap::defaultOptimization ()<tt> [static]</tt> +</h3> +Returns the default pixmap optimization setting. +<p> <p>See also <a href="#setDefaultOptimization">setDefaultOptimization</a>(), <a href="#setOptimization">setOptimization</a>(), and <a href="#optimization">optimization</a>(). + +<h3 class=fn>int <a name="depth"></a>TQPixmap::depth () const +</h3> + +<p> Returns the depth of the pixmap. +<p> The pixmap depth is also called bits per pixel (bpp) or bit planes +of a pixmap. A null pixmap has depth 0. +<p> <p>See also <a href="#defaultDepth">defaultDepth</a>(), <a href="#isNull">isNull</a>(), and <a href="qimage.html#convertDepth">TQImage::convertDepth</a>(). + +<h3 class=fn>void <a name="detach"></a>TQPixmap::detach ()<tt> [virtual]</tt> +</h3> +This is a special-purpose function that detaches the pixmap from +shared pixmap data. +<p> A pixmap is automatically detached by TQt whenever its contents is +about to change. This is done in all TQPixmap member functions +that modify the pixmap (<a href="#fill">fill</a>(), <a href="#resize">resize</a>(), <a href="#convertFromImage">convertFromImage</a>(), +<a href="#load">load</a>(), etc.), in <a href="qpaintdevice.html#bitBlt">bitBlt</a>() for the destination pixmap and in +<a href="qpainter.html#begin">TQPainter::begin</a>() on a pixmap. +<p> It is possible to modify a pixmap without letting TQt know. You can +first obtain the system-dependent <a href="qpaintdevice.html#handle">handle</a>() and then call +system-specific functions (for instance, BitBlt under Windows) +that modify the pixmap contents. In such cases, you can call +<a href="#detach">detach</a>() to cut the pixmap loose from other pixmaps that share +data with this one. +<p> detach() returns immediately if there is just a single reference +or if the pixmap has not been initialized yet. + +<h3 class=fn>void <a name="fill"></a>TQPixmap::fill ( const <a href="qcolor.html">TQColor</a> & fillColor = TQt::white ) +</h3> +Fills the pixmap with the color <em>fillColor</em>. + +<p>Examples: <a href="tutorial2-08.html#x2606">chart/setdataform.cpp</a>, <a href="desktop-example.html#x1742">desktop/desktop.cpp</a>, <a href="grapher-nsplugin-example.html#x2765">grapher/grapher.cpp</a>, <a href="hello-example.html#x1638">hello/hello.cpp</a>, <a href="tutorial1-10.html#x2358">t10/cannon.cpp</a>, <a href="themes-example.html#x292">themes/metal.cpp</a>, and <a href="xform-example.html#x1245">xform/xform.cpp</a>. +<h3 class=fn>void <a name="fill-2"></a>TQPixmap::fill ( const <a href="qwidget.html">TQWidget</a> * widget, int xofs, int yofs ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Fills the pixmap with the <em>widget</em>'s background color or pixmap. +If the background is empty, nothing is done. <em>xofs</em>, <em>yofs</em> is +an offset in the widget. + +<h3 class=fn>void <a name="fill-3"></a>TQPixmap::fill ( const <a href="qwidget.html">TQWidget</a> * widget, const <a href="qpoint.html">TQPoint</a> & ofs ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Fills the pixmap with the <em>widget</em>'s background color or pixmap. +If the background is empty, nothing is done. +<p> The <em>ofs</em> point is an offset in the widget. +<p> The point <em>ofs</em> is a point in the widget's coordinate system. The +pixmap's top-left pixel will be mapped to the point <em>ofs</em> in the +widget. This is significant if the widget has a background pixmap; +otherwise the pixmap will simply be filled with the background +color of the widget. +<p> Example: +<pre> + void CuteWidget::paintEvent( <a href="qpaintevent.html">TQPaintEvent</a> *e ) + { + <a href="qrect.html">TQRect</a> ur = e-><a href="qpaintevent.html#rect">rect</a>(); // rectangle to update + TQPixmap pix( ur.<a href="qrect.html#size">size</a>() ); // Pixmap for double-buffering + pix.<a href="#fill">fill</a>( this, ur.<a href="qrect.html#topLeft">topLeft</a>() ); // fill with widget background + + <a href="qpainter.html">TQPainter</a> p( &pix ); + p.<a href="qpainter.html#translate">translate</a>( -ur.<a href="qrect.html#x">x</a>(), -ur.<a href="qrect.html#y">y</a>() ); // use widget coordinate system + // when drawing on pixmap + // ... draw on pixmap ... + + p.<a href="qpainter.html#end">end</a>(); + + <a href="qpaintdevice.html#bitBlt">bitBlt</a>( this, ur.<a href="qrect.html#topLeft">topLeft</a>(), &pix ); + } + </pre> + + +<h3 class=fn><a href="qpixmap.html">TQPixmap</a> <a name="fromMimeSource"></a>TQPixmap::fromMimeSource ( const <a href="qstring.html">TQString</a> & abs_name )<tt> [static]</tt> +</h3> Convenience function. Gets the data associated with the absolute +name <em>abs_name</em> from the default mime source factory and decodes it +to a pixmap. +<p> <p>See also <a href="qmimesourcefactory.html">TQMimeSourceFactory</a>, <a href="qimage.html#fromMimeSource">TQImage::fromMimeSource</a>(), and <a href="qimagedrag.html#decode">TQImageDrag::decode</a>(). + +<p>Example: <a href="qactiongroup.html#x2113">textedit/textedit.cpp</a>. +<h3 class=fn><a href="qpixmap.html">TQPixmap</a> <a name="grabWidget"></a>TQPixmap::grabWidget ( <a href="qwidget.html">TQWidget</a> * widget, int x = 0, int y = 0, int w = -1, int h = -1 )<tt> [static]</tt> +</h3> +Creates a pixmap and paints <em>widget</em> in it. +<p> If the <em>widget</em> has any children, then they are also painted in +the appropriate positions. +<p> If you specify <em>x</em>, <em>y</em>, <em>w</em> or <em>h</em>, only the rectangle you +specify is painted. The defaults are 0, 0 (top-left corner) and +-1,-1 (which means the entire widget). +<p> (If <em>w</em> is negative, the function copies everything to the right +border of the window. If <em>h</em> is negative, the function copies +everything to the bottom of the window.) +<p> If <em>widget</em> is 0, or if the rectangle defined by <em>x</em>, <em>y</em>, the +modified <em>w</em> and the modified <em>h</em> does not overlap the <em>widget</em>->rect(), this function will return a null TQPixmap. +<p> This function actually asks <em>widget</em> to paint itself (and its +children to paint themselves). <a href="#grabWindow">TQPixmap::grabWindow</a>() grabs pixels +off the screen, which is a bit faster and picks up <em>exactly</em> +what's on-screen. This function works by calling paintEvent() with +painter redirection turned on. If there are overlaying windows, +<a href="#grabWindow">grabWindow</a>() will see them, but not this function. +<p> If there is overlap, it returns a pixmap of the size you want, +containing a rendering of <em>widget</em>. If the rectangle you ask for +is a superset of <em>widget</em>, the areas outside <em>widget</em> are +covered with the widget's background. +<p> If an error occurs when trying to grab the widget, such as the +size of the widget being too large to fit in memory, an <a href="#isNull">isNull</a>() +pixmap is returned. +<p> <p>See also <a href="#grabWindow">grabWindow</a>(), <a href="qpainter.html#redirect">TQPainter::redirect</a>(), and <a href="qwidget.html#paintEvent">TQWidget::paintEvent</a>(). + +<h3 class=fn><a href="qpixmap.html">TQPixmap</a> <a name="grabWindow"></a>TQPixmap::grabWindow ( WId window, int x = 0, int y = 0, int w = -1, int h = -1 )<tt> [static]</tt> +</h3> +Grabs the contents of the window <em>window</em> and makes a pixmap out +of it. Returns the pixmap. +<p> The arguments <em>(x, y)</em> specify the offset in the window, whereas +<em>(w, h)</em> specify the width and height of the area to be copied. +<p> If <em>w</em> is negative, the function copies everything to the right +border of the window. If <em>h</em> is negative, the function copies +everything to the bottom of the window. +<p> Note that <a href="#grabWindow">grabWindow</a>() grabs pixels from the screen, not from the +window. If there is another window partially or entirely over the +one you grab, you get pixels from the overlying window, too. +<p> Note also that the mouse cursor is generally not grabbed. +<p> The reason we use a window identifier and not a <a href="qwidget.html">TQWidget</a> is to +enable grabbing of windows that are not part of the application, +window system frames, and so on. +<p> <b>Warning:</b> Grabbing an area outside the screen is not safe in +general. This depends on the underlying window system. +<p> <b>Warning:</b> X11 only: If <em>window</em> is not the same depth as the root +window and another window partially or entirely obscures the one +you grab, you will <em>not</em> get pixels from the overlying window. +The contests of the obscured areas in the pixmap are undefined and +uninitialized. +<p> <p>See also <a href="#grabWidget">grabWidget</a>(). + +<p>Example: <a href="qmag-example.html#x1784">qmag/qmag.cpp</a>. +<h3 class=fn>bool <a name="hasAlpha"></a>TQPixmap::hasAlpha () const +</h3> +Returns TRUE this pixmap has an alpha channel or a mask. +<p> <p>See also <a href="#hasAlphaChannel">hasAlphaChannel</a>() and <a href="#mask">mask</a>(). + +<h3 class=fn>bool <a name="hasAlphaChannel"></a>TQPixmap::hasAlphaChannel () const +</h3> +Returns TRUE if the pixmap has an alpha channel; otherwise it +returns FALSE. +<p> NOTE: If the pixmap has a mask but not alpha channel, this +function returns FALSE. +<p> <p>See also <a href="#hasAlpha">hasAlpha</a>() and <a href="#mask">mask</a>(). + +<h3 class=fn>int <a name="height"></a>TQPixmap::height () const +</h3> + +<p> Returns the height of the pixmap. +<p> <p>See also <a href="#width">width</a>(), <a href="#size">size</a>(), and <a href="#rect">rect</a>(). + +<p>Examples: <a href="desktop-example.html#x1743">desktop/desktop.cpp</a>, <a href="movies-example.html#x510">movies/main.cpp</a>, <a href="scribble-example.html#x921">scribble/scribble.cpp</a>, <a href="scrollview-example.html#x638">scrollview/scrollview.cpp</a>, <a href="tutorial1-10.html#x2359">t10/cannon.cpp</a>, and <a href="xform-example.html#x1246">xform/xform.cpp</a>. +<h3 class=fn>const char * <a name="imageFormat"></a>TQPixmap::imageFormat ( const <a href="qstring.html">TQString</a> & fileName )<tt> [static]</tt> +</h3> +Returns a string that specifies the image format of the file <em>fileName</em>, or 0 if the file cannot be read or if the format cannot +be recognized. +<p> The <a href="qimageio.html">TQImageIO</a> documentation lists the supported image formats. +<p> <p>See also <a href="#load">load</a>() and <a href="#save">save</a>(). + +<h3 class=fn>bool <a name="isNull"></a>TQPixmap::isNull () const +</h3> + +<p> Returns TRUE if this is a null pixmap; otherwise returns FALSE. +<p> A null pixmap has zero width, zero height and no contents. You +cannot draw in a null pixmap or <a href="qpaintdevice.html#bitBlt">bitBlt</a>() anything to it. +<p> Resizing an existing pixmap to (0, 0) makes a pixmap into a null +pixmap. +<p> <p>See also <a href="#resize">resize</a>(). + +<p>Examples: <a href="movies-example.html#x511">movies/main.cpp</a>, <a href="qdir-example.html#x1834">qdir/qdir.cpp</a>, <a href="qmag-example.html#x1785">qmag/qmag.cpp</a>, and <a href="scrollview-example.html#x639">scrollview/scrollview.cpp</a>. +<h3 class=fn>bool <a name="isTQBitmap"></a>TQPixmap::isTQBitmap () const +</h3> + +<p> Returns TRUE if this is a <a href="qbitmap.html">TQBitmap</a>; otherwise returns FALSE. + +<h3 class=fn>bool <a name="load"></a>TQPixmap::load ( const <a href="qstring.html">TQString</a> & fileName, const char * format, int conversion_flags ) +</h3> +Loads a pixmap from the file <em>fileName</em> at runtime. Returns TRUE +if successful; otherwise returns FALSE. +<p> If <em>format</em> is specified, the loader attempts to read the pixmap +using the specified format. If <em>format</em> is not specified +(default), the loader reads a few bytes from the header to guess +the file's format. +<p> See the <a href="#convertFromImage">convertFromImage</a>() documentation for a description of the +<em>conversion_flags</em> argument. +<p> The <a href="qimageio.html">TQImageIO</a> documentation lists the supported image formats and +explains how to add extra formats. +<p> <p>See also <a href="#loadFromData">loadFromData</a>(), <a href="#save">save</a>(), <a href="#imageFormat">imageFormat</a>(), <a href="qimage.html#load">TQImage::load</a>(), and <a href="qimageio.html">TQImageIO</a>. + +<p>Examples: <a href="picture-example.html#x124">picture/picture.cpp</a>, <a href="scrollview-example.html#x640">scrollview/scrollview.cpp</a>, and <a href="xform-example.html#x1247">xform/xform.cpp</a>. +<h3 class=fn>bool <a name="load-2"></a>TQPixmap::load ( const <a href="qstring.html">TQString</a> & fileName, const char * format = 0, <a href="qpixmap.html#ColorMode-enum">ColorMode</a> mode = Auto ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Loads a pixmap from the file <em>fileName</em> at runtime. +<p> If <em>format</em> is specified, the loader attempts to read the pixmap +using the specified format. If <em>format</em> is not specified +(default), the loader reads a few bytes from the header to guess +the file's format. +<p> The <em>mode</em> is used to specify the color mode of the pixmap. +<p> <p>See also <a href="#ColorMode-enum">TQPixmap::ColorMode</a>. + +<h3 class=fn>bool <a name="loadFromData"></a>TQPixmap::loadFromData ( const uchar * buf, uint len, const char * format, int conversion_flags ) +</h3> +Loads a pixmap from the binary data in <em>buf</em> (<em>len</em> bytes). +Returns TRUE if successful; otherwise returns FALSE. +<p> If <em>format</em> is specified, the loader attempts to read the pixmap +using the specified format. If <em>format</em> is not specified +(default), the loader reads a few bytes from the header to guess +the file's format. +<p> See the <a href="#convertFromImage">convertFromImage</a>() documentation for a description of the +<em>conversion_flags</em> argument. +<p> The <a href="qimageio.html">TQImageIO</a> documentation lists the supported image formats and +explains how to add extra formats. +<p> <p>See also <a href="#load">load</a>(), <a href="#save">save</a>(), <a href="#imageFormat">imageFormat</a>(), <a href="qimage.html#loadFromData">TQImage::loadFromData</a>(), and <a href="qimageio.html">TQImageIO</a>. + +<h3 class=fn>bool <a name="loadFromData-2"></a>TQPixmap::loadFromData ( const uchar * buf, uint len, const char * format = 0, <a href="qpixmap.html#ColorMode-enum">ColorMode</a> mode = Auto ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Loads a pixmap from the binary data in <em>buf</em> (<em>len</em> bytes) using +color mode <em>mode</em>. Returns TRUE if successful; otherwise returns +FALSE. +<p> If <em>format</em> is specified, the loader attempts to read the pixmap +using the specified format. If <em>format</em> is not specified +(default), the loader reads a few bytes from the header to guess +the file's format. +<p> <p>See also <a href="#ColorMode-enum">TQPixmap::ColorMode</a>. + +<h3 class=fn>bool <a name="loadFromData-3"></a>TQPixmap::loadFromData ( const <a href="qbytearray.html">TQByteArray</a> & buf, const char * format = 0, int conversion_flags = 0 ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<h3 class=fn>const <a href="qbitmap.html">TQBitmap</a> * <a name="mask"></a>TQPixmap::mask () const +</h3> + +<p> Returns the mask bitmap, or 0 if no mask has been set. +<p> <p>See also <a href="#setMask">setMask</a>(), <a href="qbitmap.html">TQBitmap</a>, and <a href="#hasAlpha">hasAlpha</a>(). + +<h3 class=fn>int <a name="metric"></a>TQPixmap::metric ( int m ) const<tt> [virtual protected]</tt> +</h3> +Internal implementation of the virtual TQPaintDevice::metric() function. +<p> Use the <a href="qpaintdevicemetrics.html">TQPaintDeviceMetrics</a> class instead. +<p> <em>m</em> is the metric to get. + +<h3 class=fn><a href="qpixmap.html">TQPixmap</a> & <a name="operator-eq"></a>TQPixmap::operator= ( const <a href="qpixmap.html">TQPixmap</a> & pixmap ) +</h3> +Assigns the pixmap <em>pixmap</em> to this pixmap and returns a +reference to this pixmap. + +<h3 class=fn><a href="qpixmap.html">TQPixmap</a> & <a name="operator-eq-2"></a>TQPixmap::operator= ( const <a href="qimage.html">TQImage</a> & image ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Converts the image <em>image</em> to a pixmap that is assigned to this +pixmap. Returns a reference to the pixmap. +<p> <p>See also <a href="#convertFromImage">convertFromImage</a>(). + +<h3 class=fn><a href="qpixmap.html#Optimization-enum">Optimization</a> <a name="optimization"></a>TQPixmap::optimization () const +</h3> + +<p> Returns the optimization setting for this pixmap. +<p> The default optimization setting is <a href="#Optimization-enum">TQPixmap::NormalOptim</a>. You +can change this setting in two ways: +<ul> +<li> Call <a href="#setDefaultOptimization">setDefaultOptimization</a>() to set the default optimization +for all new pixmaps. +<li> Call <a href="#setOptimization">setOptimization</a>() to set the optimization for individual +pixmaps. +</ul> +<p> <p>See also <a href="#setOptimization">setOptimization</a>(), <a href="#setDefaultOptimization">setDefaultOptimization</a>(), and <a href="#defaultOptimization">defaultOptimization</a>(). + +<h3 class=fn><a href="qrect.html">TQRect</a> <a name="rect"></a>TQPixmap::rect () const +</h3> + +<p> Returns the enclosing rectangle (0,0,width(),height()) of the pixmap. +<p> <p>See also <a href="#width">width</a>(), <a href="#height">height</a>(), and <a href="#size">size</a>(). + +<h3 class=fn>void <a name="resize"></a>TQPixmap::resize ( int w, int h ) +</h3> +Resizes the pixmap to <em>w</em> width and <em>h</em> height. If either <em>w</em> +or <em>h</em> is 0, the pixmap becomes a null pixmap. +<p> If both <em>w</em> and <em>h</em> are greater than 0, a valid pixmap is +created. New pixels will be uninitialized (random) if the pixmap +is expanded. + +<p>Examples: <a href="desktop-example.html#x1744">desktop/desktop.cpp</a> and <a href="grapher-nsplugin-example.html#x2766">grapher/grapher.cpp</a>. +<h3 class=fn>void <a name="resize-2"></a>TQPixmap::resize ( const <a href="qsize.html">TQSize</a> & size ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Resizes the pixmap to size <em>size</em>. + +<h3 class=fn>bool <a name="save"></a>TQPixmap::save ( const <a href="qstring.html">TQString</a> & fileName, const char * format, int quality = -1 ) const +</h3> +Saves the pixmap to the file <em>fileName</em> using the image file +format <em>format</em> and a quality factor <em>quality</em>. <em>quality</em> must +be in the range [0,100] or -1. Specify 0 to obtain small +compressed files, 100 for large uncompressed files, and -1 to use +the default settings. Returns TRUE if successful; otherwise +returns FALSE. +<p> <p>See also <a href="#load">load</a>(), <a href="#loadFromData">loadFromData</a>(), <a href="#imageFormat">imageFormat</a>(), <a href="qimage.html#save">TQImage::save</a>(), and <a href="qimageio.html">TQImageIO</a>. + +<p>Example: <a href="qmag-example.html#x1786">qmag/qmag.cpp</a>. +<h3 class=fn>bool <a name="save-2"></a>TQPixmap::save ( <a href="qiodevice.html">TQIODevice</a> * device, const char * format, int quality = -1 ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> This function writes a TQPixmap to the <a href="qiodevice.html">TQIODevice</a>, <em>device</em>. This +can be used, for example, to save a pixmap directly into a +TQByteArray: +<pre> + TQPixmap pixmap; + <a href="qbytearray.html">TQByteArray</a> ba; + <a href="qbuffer.html">TQBuffer</a> buffer( ba ); + buffer.<a href="qiodevice.html#open">open</a>( <a href="qfile.html#open">IO_WriteOnly</a> ); + pixmap.<a href="#save">save</a>( &buffer, "PNG" ); // writes pixmap into ba in PNG format + </pre> + + +<h3 class=fn>bool <a name="selfMask"></a>TQPixmap::selfMask () const +</h3> + +<p> Returns TRUE if the pixmap's mask is identical to the pixmap +itself; otherwise returns FALSE. +<p> <p>See also <a href="#mask">mask</a>(). + +<h3 class=fn>int <a name="serialNumber"></a>TQPixmap::serialNumber () const +</h3> + +<p> Returns a number that uniquely identifies the contents of this +TQPixmap object. This means that multiple TQPixmap objects can have +the same serial number as long as they refer to the same contents. +<p> An example of where this is useful is for caching TQPixmaps. +<p> <p>See also <a href="qpixmapcache.html">TQPixmapCache</a>. + +<h3 class=fn>void <a name="setDefaultOptimization"></a>TQPixmap::setDefaultOptimization ( <a href="qpixmap.html#Optimization-enum">Optimization</a> optimization )<tt> [static]</tt> +</h3> +Sets the default pixmap optimization. +<p> All <em>new</em> pixmaps that are created will use this default +optimization. You may also set optimization for individual pixmaps +using the <a href="#setOptimization">setOptimization</a>() function. +<p> The initial default <em>optimization</em> setting is <tt>TQPixmap::Normal</tt>. +<p> <p>See also <a href="#defaultOptimization">defaultOptimization</a>(), <a href="#setOptimization">setOptimization</a>(), and <a href="#optimization">optimization</a>(). + +<h3 class=fn>void <a name="setMask"></a>TQPixmap::setMask ( const <a href="qbitmap.html">TQBitmap</a> & newmask ) +</h3> +Sets a mask bitmap. +<p> The <em>newmask</em> bitmap defines the clip mask for this pixmap. Every +pixel in <em>newmask</em> corresponds to a pixel in this pixmap. Pixel +value 1 means opaque and pixel value 0 means transparent. The mask +must have the same size as this pixmap. +<p> <b>Warning:</b> Setting the mask on a pixmap will cause any alpha channel +data to be cleared. For example: +<pre> + TQPixmap alpha( "image-with-alpha.png" ); + TQPixmap alphacopy = alpha; + alphacopy.<a href="#setMask">setMask</a>( *alphacopy.<a href="#mask">mask</a>() ); + </pre> + +Now, alpha and alphacopy are visually different. +<p> Setting a <a href="#isNull">null</a> mask resets the mask. +<p> <p>See also <a href="#mask">mask</a>(), <a href="#createHeuristicMask">createHeuristicMask</a>(), and <a href="qbitmap.html">TQBitmap</a>. + +<h3 class=fn>void <a name="setOptimization"></a>TQPixmap::setOptimization ( <a href="qpixmap.html#Optimization-enum">Optimization</a> optimization ) +</h3> +Sets pixmap drawing optimization for this pixmap. +<p> The <em>optimization</em> setting affects pixmap operations, in +particular drawing of transparent pixmaps (<a href="qpaintdevice.html#bitBlt">bitBlt</a>() a pixmap with +a mask set) and pixmap transformations (the <a href="#xForm">xForm</a>() function). +<p> Pixmap optimization involves keeping intermediate results in a +cache buffer and using the cache to speed up bitBlt() and xForm(). +The cost is more memory consumption, up to twice as much as an +unoptimized pixmap. +<p> Use the <a href="#setDefaultOptimization">setDefaultOptimization</a>() to change the default +optimization for all new pixmaps. +<p> <p>See also <a href="#optimization">optimization</a>(), <a href="#setDefaultOptimization">setDefaultOptimization</a>(), and <a href="#defaultOptimization">defaultOptimization</a>(). + +<p>Example: <a href="desktop-example.html#x1745">desktop/desktop.cpp</a>. +<h3 class=fn><a href="qsize.html">TQSize</a> <a name="size"></a>TQPixmap::size () const +</h3> + +<p> Returns the size of the pixmap. +<p> <p>See also <a href="#width">width</a>(), <a href="#height">height</a>(), and <a href="#rect">rect</a>(). + +<p>Example: <a href="movies-example.html#x512">movies/main.cpp</a>. +<h3 class=fn><a href="qwmatrix.html">TQWMatrix</a> <a name="trueMatrix"></a>TQPixmap::trueMatrix ( const <a href="qwmatrix.html">TQWMatrix</a> & matrix, int w, int h )<tt> [static]</tt> +</h3> +Returns the actual matrix used for transforming a pixmap with <em>w</em> +width and <em>h</em> height and matrix <em>matrix</em>. +<p> When transforming a pixmap with <a href="#xForm">xForm</a>(), the <a href="qwmatrix.html#TransformationMode">transformation matrix</a> +is internally adjusted to compensate for unwanted translation, +i.e. xForm() returns the smallest pixmap containing all +transformed points of the original pixmap. +<p> This function returns the modified matrix, which maps points +correctly from the original pixmap into the new pixmap. +<p> <p>See also <a href="#xForm">xForm</a>() and <a href="qwmatrix.html">TQWMatrix</a>. + +<h3 class=fn>int <a name="width"></a>TQPixmap::width () const +</h3> + +<p> Returns the width of the pixmap. +<p> <p>See also <a href="#height">height</a>(), <a href="#size">size</a>(), and <a href="#rect">rect</a>(). + +<p>Examples: <a href="desktop-example.html#x1746">desktop/desktop.cpp</a>, <a href="movies-example.html#x513">movies/main.cpp</a>, <a href="scribble-example.html#x922">scribble/scribble.cpp</a>, <a href="scrollview-example.html#x641">scrollview/scrollview.cpp</a>, and <a href="xform-example.html#x1248">xform/xform.cpp</a>. +<h3 class=fn><a href="qpixmap.html">TQPixmap</a> <a name="xForm"></a>TQPixmap::xForm ( const <a href="qwmatrix.html">TQWMatrix</a> & matrix ) const +</h3> +Returns a copy of the pixmap that is transformed using <em>matrix</em>. +The original pixmap is not changed. +<p> The transformation <em>matrix</em> is internally adjusted to compensate +for unwanted translation, i.e. <a href="#xForm">xForm</a>() returns the smallest image +that contains all the transformed points of the original image. +<p> This function is slow because it involves transformation to a +<a href="qimage.html">TQImage</a>, non-trivial computations and a transformation back to a +TQPixmap. +<p> <p>See also <a href="#trueMatrix">trueMatrix</a>(), <a href="qwmatrix.html">TQWMatrix</a>, <a href="qpainter.html#setWorldMatrix">TQPainter::setWorldMatrix</a>(), and <a href="qimage.html#xForm">TQImage::xForm</a>(). + +<p>Examples: <a href="desktop-example.html#x1747">desktop/desktop.cpp</a>, <a href="fileiconview-example.html#x863">fileiconview/qfileiconview.cpp</a>, <a href="movies-example.html#x514">movies/main.cpp</a>, and <a href="qmag-example.html#x1787">qmag/qmag.cpp</a>. +<hr><h2>Related Functions</h2> +<h3 class=fn>void <a name="copyBlt"></a>copyBlt ( <a href="qpixmap.html">TQPixmap</a> * dst, int dx, int dy, const <a href="qpixmap.html">TQPixmap</a> * src, int sx, int sy, int sw, int sh ) +</h3> + +<p> Copies a block of pixels from <em>src</em> to <em>dst</em>. The alpha channel +and mask data (if any) is also copied from <em>src</em>. NOTE: <em>src</em> +is <em>not</em> alpha blended or masked when copied to <em>dst</em>. Use +<a href="qpaintdevice.html#bitBlt">bitBlt</a>() or <a href="qpainter.html#drawPixmap">TQPainter::drawPixmap</a>() to perform alpha blending or +masked drawing. +<p> <em>sx</em>, <em>sy</em> is the top-left pixel in <em>src</em> (0, 0 by default), <em>dx</em>, <em>dy</em> is the top-left position in <em>dst</em> and <em>sw</em>, \sh is the +size of the copied block (all of <em>src</em> by default). +<p> If <em>src</em>, <em>dst</em>, <em>sw</em> or <em>sh</em> is 0 (zero), <a href="#copyBlt">copyBlt</a>() does +nothing. If <em>sw</em> or <em>sh</em> is negative, copyBlt() copies starting +at <em>sx</em> (and respectively, <em>sy</em>) and ending at the right edge +(and respectively, the bottom edge) of <em>src</em>. +<p> copyBlt() does nothing if <em>src</em> and <em>dst</em> have different depths. + +<h3 class=fn><a href="qdatastream.html">TQDataStream</a> & <a name="operator-lt-lt"></a>operator<< ( <a href="qdatastream.html">TQDataStream</a> & s, const <a href="qpixmap.html">TQPixmap</a> & pixmap ) +</h3> + +<p> Writes the pixmap <em>pixmap</em> to the stream <em>s</em> as a PNG image. +<p> Note that writing the stream to a file will not produce a valid image file. +<p> <p>See also <a href="#save">TQPixmap::save</a>() and <a href="datastreamformat.html">Format of the TQDataStream operators</a>. + +<h3 class=fn><a href="qdatastream.html">TQDataStream</a> & <a name="operator-gt-gt"></a>operator>> ( <a href="qdatastream.html">TQDataStream</a> & s, <a href="qpixmap.html">TQPixmap</a> & pixmap ) +</h3> + +<p> Reads a pixmap from the stream <em>s</em> into the pixmap <em>pixmap</em>. +<p> <p>See also <a href="#load">TQPixmap::load</a>() and <a href="datastreamformat.html">Format of the TQDataStream operators</a>. + +<!-- eof --> +<hr><p> +This file is part of the <a href="index.html">TQt toolkit</a>. +Copyright © 1995-2007 +<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center> +<table width=100% cellspacing=0 border=0><tr> +<td>Copyright © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>TQt 3.3.8</div> +</table></div></address></body> +</html> |