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| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
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| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/qscreen.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
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| -rw-r--r-- | doc/html/qscreen.html | 440 |
1 files changed, 440 insertions, 0 deletions
diff --git a/doc/html/qscreen.html b/doc/html/qscreen.html new file mode 100644 index 0000000..40603fe --- /dev/null +++ b/doc/html/qscreen.html @@ -0,0 +1,440 @@ +<!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/qgfxraster_qws.cpp:5792 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>QScreen 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>QScreen Class Reference</h1> + +<p>The QScreen class and its descendants manage the framebuffer and +palette. +<a href="#details">More...</a> +<p><tt>#include <<a href="qgfx_qws-h.html">qgfx_qws.h</a>></tt> +<p><a href="qscreen-members.html">List of all member functions.</a> +<h2>Public Members</h2> +<ul> +<li class=fn><a href="#QScreen"><b>QScreen</b></a> ( int display_id )</li> +<li class=fn>virtual <a href="#~QScreen"><b>~QScreen</b></a> ()</li> +<li class=fn>virtual bool <a href="#initDevice"><b>initDevice</b></a> () = 0</li> +<li class=fn>virtual bool <a href="#connect"><b>connect</b></a> ( const QString & displaySpec ) = 0</li> +<li class=fn>virtual void <a href="#disconnect"><b>disconnect</b></a> () = 0</li> +<li class=fn>virtual int <a href="#initCursor"><b>initCursor</b></a> ( void * end_of_location, bool init = FALSE )</li> +<li class=fn>virtual void <a href="#shutdownDevice"><b>shutdownDevice</b></a> ()</li> +<li class=fn>virtual void <a href="#setMode"><b>setMode</b></a> ( int, int, int ) = 0</li> +<li class=fn>virtual bool <a href="#supportsDepth"><b>supportsDepth</b></a> ( int d ) const</li> +<li class=fn>virtual QGfx * <a href="#createGfx"><b>createGfx</b></a> ( unsigned char * bytes, int w, int h, int d, int linestep )</li> +<li class=fn>virtual QGfx * <a href="#screenGfx"><b>screenGfx</b></a> ()</li> +<li class=fn>virtual void <a href="#save"><b>save</b></a> ()</li> +<li class=fn>virtual void <a href="#restore"><b>restore</b></a> ()</li> +<li class=fn>virtual void <a href="#blank"><b>blank</b></a> ( bool on )</li> +<li class=fn>virtual int <a href="#pixmapOffsetAlignment"><b>pixmapOffsetAlignment</b></a> ()</li> +<li class=fn>virtual int <a href="#pixmapLinestepAlignment"><b>pixmapLinestepAlignment</b></a> ()</li> +<li class=fn>virtual bool <a href="#onCard"><b>onCard</b></a> ( unsigned char * p ) const</li> +<li class=fn>virtual bool <a href="#onCard-2"><b>onCard</b></a> ( unsigned char * p, ulong & offset ) const</li> +<li class=fn>virtual void <a href="#set"><b>set</b></a> ( unsigned int, unsigned int, unsigned int, unsigned int )</li> +<li class=fn>virtual int <a href="#alloc"><b>alloc</b></a> ( unsigned int r, unsigned int g, unsigned int b )</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>int <a href="#depth"><b>depth</b></a> () const</li> +<li class=fn>virtual int <a href="#pixmapDepth"><b>pixmapDepth</b></a> () const</li> +<li class=fn>int <a href="#pixelType"><b>pixelType</b></a> () const</li> +<li class=fn>int <a href="#linestep"><b>linestep</b></a> () const</li> +<li class=fn>int <a href="#deviceWidth"><b>deviceWidth</b></a> () const</li> +<li class=fn>int <a href="#deviceHeight"><b>deviceHeight</b></a> () const</li> +<li class=fn>uchar * <a href="#base"><b>base</b></a> () const</li> +<li class=fn>virtual uchar * <a href="#cache"><b>cache</b></a> ( int, int )</li> +<li class=fn>virtual void <a href="#uncache"><b>uncache</b></a> ( uchar * )</li> +<li class=fn>int <a href="#screenSize"><b>screenSize</b></a> () const</li> +<li class=fn>int <a href="#totalSize"><b>totalSize</b></a> () const</li> +<li class=fn>QRgb * <a href="#clut"><b>clut</b></a> ()</li> +<li class=fn>int <a href="#numCols"><b>numCols</b></a> ()</li> +<li class=fn>virtual QSize <a href="#mapToDevice"><b>mapToDevice</b></a> ( const QSize & s ) const</li> +<li class=fn>virtual QSize <a href="#mapFromDevice"><b>mapFromDevice</b></a> ( const QSize & s ) const</li> +<li class=fn>virtual QPoint <a href="#mapToDevice-2"><b>mapToDevice</b></a> ( const QPoint &, const QSize & ) const</li> +<li class=fn>virtual QPoint <a href="#mapFromDevice-2"><b>mapFromDevice</b></a> ( const QPoint &, const QSize & ) const</li> +<li class=fn>virtual QRect <a href="#mapToDevice-3"><b>mapToDevice</b></a> ( const QRect & r, const QSize & ) const</li> +<li class=fn>virtual QRect <a href="#mapFromDevice-3"><b>mapFromDevice</b></a> ( const QRect & r, const QSize & ) const</li> +<li class=fn>virtual QImage <a href="#mapToDevice-4"><b>mapToDevice</b></a> ( const QImage & i ) const</li> +<li class=fn>virtual QImage <a href="#mapFromDevice-4"><b>mapFromDevice</b></a> ( const QImage & i ) const</li> +<li class=fn>virtual QRegion <a href="#mapToDevice-5"><b>mapToDevice</b></a> ( const QRegion & r, const QSize & ) const</li> +<li class=fn>virtual QRegion <a href="#mapFromDevice-5"><b>mapFromDevice</b></a> ( const QRegion & r, const QSize & ) const</li> +<li class=fn>virtual int <a href="#transformOrientation"><b>transformOrientation</b></a> () const</li> +<li class=fn>virtual bool <a href="#isTransformed"><b>isTransformed</b></a> () const</li> +<li class=fn>virtual bool <a href="#isInterlaced"><b>isInterlaced</b></a> () const</li> +<li class=fn>virtual void <a href="#setDirty"><b>setDirty</b></a> ( const QRect & )</li> +<li class=fn>int * <a href="#opType"><b>opType</b></a> ()</li> +<li class=fn>int * <a href="#lastOp"><b>lastOp</b></a> ()</li> +</ul> +<hr><a name="details"></a><h2>Detailed Description</h2> + + + +The QScreen class and its descendants manage the framebuffer and +palette. +<p> QScreens act as factories for the screen cursor and QGfx's. QLinuxFbScreen +manages a Linux framebuffer; accelerated drivers subclass QLinuxFbScreen. +There can only be one screen in a Qt/Embedded application. +<p>See also <a href="qws.html">Qt/Embedded</a>. + +<hr><h2>Member Function Documentation</h2> +<h3 class=fn><a name="QScreen"></a>QScreen::QScreen ( int display_id ) +</h3> + +Create a screen; the <em>display_id</em> is the number of the Qt/Embedded server +to connect to. + +<h3 class=fn><a name="~QScreen"></a>QScreen::~QScreen ()<tt> [virtual]</tt> +</h3> +Destroys a QScreen + +<h3 class=fn>int <a name="alloc"></a>QScreen::alloc ( unsigned int r, unsigned int g, unsigned int b )<tt> [virtual]</tt> +</h3> +Given an RGB value <em>r</em> <em>g</em> <em>b</em>, return an index which is the closest +match to it in the screen's palette. Used in paletted modes only. + +<h3 class=fn>uchar * <a name="base"></a>QScreen::base () const +</h3> + +Returns a pointer to the start of the framebuffer. + +<h3 class=fn>void <a name="blank"></a>QScreen::blank ( bool on )<tt> [virtual]</tt> +</h3> + +If <em>on</em> is true, blank the screen. Otherwise unblank it. + +<h3 class=fn>uchar * <a name="cache"></a>QScreen::cache ( int, int )<tt> [virtual]</tt> +</h3> + +This function is used to store pixmaps in graphics memory for the +use of the accelerated drivers. See QLinuxFbScreen (where the cacheing +is implemented) for more information. + +<h3 class=fn>QRgb * <a name="clut"></a>QScreen::clut () +</h3> + +Returns the screen's color lookup table (color palette). This is only +valid in paletted modes (8bpp and lower). + +<h3 class=fn>bool <a name="connect"></a>QScreen::connect ( const <a href="qstring.html">QString</a> & displaySpec )<tt> [pure virtual]</tt> +</h3> + +This function is called by every Qt/Embedded application on startup. +It maps in the framebuffer and in the accelerated drivers the graphics +card control registers. <em>displaySpec</em> has the following syntax: +<p> +<tt>[gfx driver][:driver specific options][:display number]</tt> +<p> +for example if you want to use the mach64 driver on fb1 as display 2: +<p> +<tt>Mach64:/dev/fb1:2</tt> +<p> +<em>displaySpec</em> is passed in via the QWS_DISPLAY environment variable +or the -display command line parameter. + +<h3 class=fn>QGfx * <a name="createGfx"></a>QScreen::createGfx ( unsigned char * bytes, int w, int h, int d, int linestep )<tt> [virtual]</tt> +</h3> + +Creates a gfx on an arbitrary buffer <em>bytes</em>, width <em>w</em> and height <em>h</em> in +pixels, depth <em>d</em> and <em>linestep</em> (length in bytes of each line in the +buffer). Accelerated drivers can check to see if <em>bytes</em> points into +graphics memory and create an accelerated Gfx. + +<h3 class=fn>int <a name="depth"></a>QScreen::depth () const +</h3> + +Gives the depth in bits per pixel of the framebuffer. This is the number +of bits each pixel takes up rather than the number of significant bits, +so 24bpp and 32bpp express the same range of colors (8 bits of +red, green and blue) + +<h3 class=fn>int <a name="deviceHeight"></a>QScreen::deviceHeight () const +</h3> + +Gives the full height of the framebuffer device, as opposed to the +height which Qt/Embedded will actually use. These can differ if the +display is centered within the framebuffer. + +<h3 class=fn>int <a name="deviceWidth"></a>QScreen::deviceWidth () const +</h3> + +Gives the full width of the framebuffer device, as opposed to the +width which Qt/Embedded will actually use. These can differ if the +display is centered within the framebuffer. + +<h3 class=fn>void <a name="disconnect"></a>QScreen::disconnect ()<tt> [pure virtual]</tt> +</h3> + +This function is called by every Qt/Embedded application just +before exitting; it's normally used to unmap the framebuffer. + +<h3 class=fn>int <a name="height"></a>QScreen::height () const +</h3> + +Gives the height in pixels of the framebuffer. + +<h3 class=fn>int <a name="initCursor"></a>QScreen::initCursor ( void * end_of_location, bool init = FALSE )<tt> [virtual]</tt> +</h3> +This is used to initialize the software cursor - <em>end_of_location</em> +points to the address after the area where the cursor image can be stored. +<em>init</em> is true for the first application this method is called from +(the Qt/Embedded server), false otherwise. + +<h3 class=fn>bool <a name="initDevice"></a>QScreen::initDevice ()<tt> [pure virtual]</tt> +</h3> + +This function is called by the Qt/Embedded server when initializing +the framebuffer. Accelerated drivers use it to set up the graphics card. + +<h3 class=fn>bool <a name="isInterlaced"></a>QScreen::isInterlaced () const<tt> [virtual]</tt> +</h3> + +<p> Returns TRUE if the display is interlaced (for instance a +television screen); otherwise returns FALSE. If TRUE, drawing is +altered to look better on such displays. + +<h3 class=fn>bool <a name="isTransformed"></a>QScreen::isTransformed () const<tt> [virtual]</tt> +</h3> + +<p> Returns TRUE if the screen is transformed (for instance, rotated +90 degrees); otherwise returns FALSE. QScreen's version always +returns FALSE. + +<h3 class=fn>int * <a name="lastOp"></a>QScreen::lastOp () +</h3> + +<p> Returns the screens last operation. + +<h3 class=fn>int <a name="linestep"></a>QScreen::linestep () const +</h3> + +Returns the length in bytes of each scanline of the framebuffer. + +<h3 class=fn><a href="qsize.html">QSize</a> <a name="mapFromDevice"></a>QScreen::mapFromDevice ( const <a href="qsize.html">QSize</a> & s ) const<tt> [virtual]</tt> +</h3> + +<p> Map a framebuffer coordinate to the coordinate space used by the +application. Used by the rotated driver; the QScreen +implementation simply returns <em>s</em>. + +<h3 class=fn><a href="qpoint.html">QPoint</a> <a name="mapFromDevice-2"></a>QScreen::mapFromDevice ( const <a href="qpoint.html">QPoint</a> &, const <a href="qsize.html">QSize</a> & ) const<tt> [virtual]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Map a framebuffer coordinate to the coordinate space used by the +application. Used by the rotated driver; the QScreen +implementation simply returns the point. + +<h3 class=fn><a href="qrect.html">QRect</a> <a name="mapFromDevice-3"></a>QScreen::mapFromDevice ( const <a href="qrect.html">QRect</a> & r, const <a href="qsize.html">QSize</a> & ) const<tt> [virtual]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Map a framebuffer coordinate to the coordinate space used by the +application. Used by the rotated driver; the QScreen +implementation simply returns <em>r</em>. + +<h3 class=fn><a href="qimage.html">QImage</a> <a name="mapFromDevice-4"></a>QScreen::mapFromDevice ( const <a href="qimage.html">QImage</a> & i ) const<tt> [virtual]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Transforms an image so that it matches the application coordinate +space (e.g. rotating it 90 degrees counter-clockwise). The QScreen +implementation simply returns <em>i</em>. + +<h3 class=fn><a href="qregion.html">QRegion</a> <a name="mapFromDevice-5"></a>QScreen::mapFromDevice ( const <a href="qregion.html">QRegion</a> & r, const <a href="qsize.html">QSize</a> & ) const<tt> [virtual]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Transforms a region so that it matches the application coordinate +space (e.g. rotating it 90 degrees counter-clockwise). The QScreen +implementation simply returns <em>r</em>. + +<h3 class=fn><a href="qsize.html">QSize</a> <a name="mapToDevice"></a>QScreen::mapToDevice ( const <a href="qsize.html">QSize</a> & s ) const<tt> [virtual]</tt> +</h3> + +<p> Map a user coordinate to the one to actually draw. Used by the +rotated driver; the QScreen implementation simply returns <em>s</em>. + +<h3 class=fn><a href="qpoint.html">QPoint</a> <a name="mapToDevice-2"></a>QScreen::mapToDevice ( const <a href="qpoint.html">QPoint</a> &, const <a href="qsize.html">QSize</a> & ) const<tt> [virtual]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Map a user coordinate to the one to actually draw. Used by the +rotated driver; the QScreen implementation simply returns the +point passed in. + +<h3 class=fn><a href="qrect.html">QRect</a> <a name="mapToDevice-3"></a>QScreen::mapToDevice ( const <a href="qrect.html">QRect</a> & r, const <a href="qsize.html">QSize</a> & ) const<tt> [virtual]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Map a user coordinate to the one to actually draw. Used by the +rotated driver; the QScreen implementation simply returns <em>r</em>. + +<h3 class=fn><a href="qimage.html">QImage</a> <a name="mapToDevice-4"></a>QScreen::mapToDevice ( const <a href="qimage.html">QImage</a> & i ) const<tt> [virtual]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Transforms an image so that it fits the device coordinate space +(e.g. rotating it 90 degrees clockwise). The QScreen +implementation simply returns <em>i</em>. + +<h3 class=fn><a href="qregion.html">QRegion</a> <a name="mapToDevice-5"></a>QScreen::mapToDevice ( const <a href="qregion.html">QRegion</a> & r, const <a href="qsize.html">QSize</a> & ) const<tt> [virtual]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Transforms a region so that it fits the device coordinate space +(e.g. rotating it 90 degrees clockwise). The QScreen +implementation simply returns <em>r</em>. + +<h3 class=fn>int <a name="numCols"></a>QScreen::numCols () +</h3> + +Returns the number of entries in the color table returned by <a href="#clut">clut</a>(). + +<h3 class=fn>bool <a name="onCard"></a>QScreen::onCard ( unsigned char * p ) const<tt> [virtual]</tt> +</h3> + +Returns true if the buffer pointed to by <em>p</em> is within graphics card +memory, false if it's in main RAM. + +<h3 class=fn>bool <a name="onCard-2"></a>QScreen::onCard ( unsigned char * p, ulong & offset ) const<tt> [virtual]</tt> +</h3> + +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> This checks whether the buffer specified by <em>p</em> is on the card +(as per the other version of onCard) and returns an offset in bytes +from the start of graphics card memory in <em>offset</em> if it is. + +<h3 class=fn>int * <a name="opType"></a>QScreen::opType () +</h3> + +<p> Returns the screen's operation type. + +<h3 class=fn>int <a name="pixelType"></a>QScreen::pixelType () const +</h3> + +Returns an integer (taking the same values as QGfx::PixelType) +that specifies the pixel storage format of the screen. + +<h3 class=fn>int <a name="pixmapDepth"></a>QScreen::pixmapDepth () const<tt> [virtual]</tt> +</h3> + +Gives the preferred depth for pixmaps. By default this is the same +as the screen depth, but for the VGA16 driver it's 8bpp. + +<h3 class=fn>int <a name="pixmapLinestepAlignment"></a>QScreen::pixmapLinestepAlignment ()<tt> [virtual]</tt> +</h3> + +Returns the value in bits to which individual scanlines of pixmaps held in +graphics card memory should be aligned. This is only useful for accelerated +drivers. By default the value returned is 64 but it can be overridden +by individual accelerated drivers. + +<h3 class=fn>int <a name="pixmapOffsetAlignment"></a>QScreen::pixmapOffsetAlignment ()<tt> [virtual]</tt> +</h3> + +Returns the value in bits to which the start address of pixmaps held in +graphics card memory should be aligned. This is only useful for accelerated +drivers. By default the value returned is 64 but it can be overridden +by individual accelerated drivers. + +<h3 class=fn>void <a name="restore"></a>QScreen::restore ()<tt> [virtual]</tt> +</h3> +Restores the state of the graphics card from a previous <a href="#save">save</a>() + +<h3 class=fn>void <a name="save"></a>QScreen::save ()<tt> [virtual]</tt> +</h3> +Saves the state of the graphics card - used so that, for instance, +the palette can be restored when switching between linux virtual +consoles. Hardware QScreen descendants should save register state +here if necessary if switching between virtual consoles (for +example to/from X) is to be permitted. + +<h3 class=fn>QGfx * <a name="screenGfx"></a>QScreen::screenGfx ()<tt> [virtual]</tt> +</h3> +Returns a QGfx (normally a QGfxRaster) initialized to point to the screen, +with an origin at 0,0 and a clip region covering the whole screen. + +<h3 class=fn>int <a name="screenSize"></a>QScreen::screenSize () const +</h3> + +Returns the size in bytes of the screen. This is always located at +the beginning of framebuffer memory (i.e. at <a href="#base">base</a>()). + +<h3 class=fn>void <a name="set"></a>QScreen::set ( unsigned int, unsigned int, unsigned int, unsigned int )<tt> [virtual]</tt> +</h3> +Sets an entry in the color palette. + +<h3 class=fn>void <a name="setDirty"></a>QScreen::setDirty ( const <a href="qrect.html">QRect</a> & )<tt> [virtual]</tt> +</h3> + +<p> Indicates which section of the screen has been altered. Used by +the VNC and VFB displays; the QScreen version does nothing. + +<h3 class=fn>void <a name="setMode"></a>QScreen::setMode ( int, int, int )<tt> [pure virtual]</tt> +</h3> + +This function can be used to set the framebuffer width, height and +depth. It's currently unused. + +<h3 class=fn>void <a name="shutdownDevice"></a>QScreen::shutdownDevice ()<tt> [virtual]</tt> +</h3> +Called by the Qt/Embedded server on shutdown; never called by +a Qt/Embedded client. This is intended to support graphics card specific +shutdown; the unaccelerated implementation simply hides the mouse cursor. + +<h3 class=fn>bool <a name="supportsDepth"></a>QScreen::supportsDepth ( int d ) const<tt> [virtual]</tt> +</h3> + +Returns true if the screen supports a particular color depth <em>d</em>. +Possible values are 1,4,8,16 and 32. + +<h3 class=fn>int <a name="totalSize"></a>QScreen::totalSize () const +</h3> + +Returns the size in bytes of available graphics card memory, including the +screen. Offscreen memory is only used by the accelerated drivers. + +<h3 class=fn>int <a name="transformOrientation"></a>QScreen::transformOrientation () const<tt> [virtual]</tt> +</h3> + +<p> Used by the rotated server. The QScreeen implementation returns 0. + +<h3 class=fn>void <a name="uncache"></a>QScreen::uncache ( uchar * )<tt> [virtual]</tt> +</h3> + +This function is called on pixmap destruction to remove them from +graphics card memory. + +<h3 class=fn>int <a name="width"></a>QScreen::width () const +</h3> + +Gives the width in pixels of the framebuffer. + +<!-- eof --> +<hr><p> +This file is part of the <a href="index.html">Qt 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>Qt 3.3.8</div> +</table></div></address></body> +</html> |