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441 lines
22 KiB
441 lines
22 KiB
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQScreen Class Reference</h1>
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<p>The TQScreen class and its descendants manage the framebuffer and
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palette.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qgfx_qws-h.html">qgfx_qws.h</a>></tt>
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<p><a href="qscreen-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#TQScreen"><b>TQScreen</b></a> ( int display_id )</li>
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<li class=fn>virtual <a href="#~TQScreen"><b>~TQScreen</b></a> ()</li>
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<li class=fn>virtual bool <a href="#initDevice"><b>initDevice</b></a> () = 0</li>
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<li class=fn>virtual bool <a href="#connect"><b>connect</b></a> ( const TQString & displaySpec ) = 0</li>
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<li class=fn>virtual void <a href="#disconnect"><b>disconnect</b></a> () = 0</li>
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<li class=fn>virtual int <a href="#initCursor"><b>initCursor</b></a> ( void * end_of_location, bool init = FALSE )</li>
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<li class=fn>virtual void <a href="#shutdownDevice"><b>shutdownDevice</b></a> ()</li>
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<li class=fn>virtual void <a href="#setMode"><b>setMode</b></a> ( int, int, int ) = 0</li>
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<li class=fn>virtual bool <a href="#supportsDepth"><b>supportsDepth</b></a> ( int d ) const</li>
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<li class=fn>virtual TQGfx * <a href="#createGfx"><b>createGfx</b></a> ( unsigned char * bytes, int w, int h, int d, int linestep )</li>
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<li class=fn>virtual TQGfx * <a href="#screenGfx"><b>screenGfx</b></a> ()</li>
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<li class=fn>virtual void <a href="#save"><b>save</b></a> ()</li>
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<li class=fn>virtual void <a href="#restore"><b>restore</b></a> ()</li>
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<li class=fn>virtual void <a href="#blank"><b>blank</b></a> ( bool on )</li>
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<li class=fn>virtual int <a href="#pixmapOffsetAlignment"><b>pixmapOffsetAlignment</b></a> ()</li>
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<li class=fn>virtual int <a href="#pixmapLinestepAlignment"><b>pixmapLinestepAlignment</b></a> ()</li>
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<li class=fn>virtual bool <a href="#onCard"><b>onCard</b></a> ( unsigned char * p ) const</li>
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<li class=fn>virtual bool <a href="#onCard-2"><b>onCard</b></a> ( unsigned char * p, ulong & offset ) const</li>
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<li class=fn>virtual void <a href="#set"><b>set</b></a> ( unsigned int, unsigned int, unsigned int, unsigned int )</li>
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<li class=fn>virtual int <a href="#alloc"><b>alloc</b></a> ( unsigned int r, unsigned int g, unsigned int b )</li>
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<li class=fn>int <a href="#width"><b>width</b></a> () const</li>
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<li class=fn>int <a href="#height"><b>height</b></a> () const</li>
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<li class=fn>int <a href="#depth"><b>depth</b></a> () const</li>
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<li class=fn>virtual int <a href="#pixmapDepth"><b>pixmapDepth</b></a> () const</li>
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<li class=fn>int <a href="#pixelType"><b>pixelType</b></a> () const</li>
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<li class=fn>int <a href="#linestep"><b>linestep</b></a> () const</li>
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<li class=fn>int <a href="#deviceWidth"><b>deviceWidth</b></a> () const</li>
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<li class=fn>int <a href="#deviceHeight"><b>deviceHeight</b></a> () const</li>
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<li class=fn>uchar * <a href="#base"><b>base</b></a> () const</li>
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<li class=fn>virtual uchar * <a href="#cache"><b>cache</b></a> ( int, int )</li>
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<li class=fn>virtual void <a href="#uncache"><b>uncache</b></a> ( uchar * )</li>
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<li class=fn>int <a href="#screenSize"><b>screenSize</b></a> () const</li>
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<li class=fn>int <a href="#totalSize"><b>totalSize</b></a> () const</li>
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<li class=fn>TQRgb * <a href="#clut"><b>clut</b></a> ()</li>
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<li class=fn>int <a href="#numCols"><b>numCols</b></a> ()</li>
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<li class=fn>virtual TQSize <a href="#mapToDevice"><b>mapToDevice</b></a> ( const TQSize & s ) const</li>
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<li class=fn>virtual TQSize <a href="#mapFromDevice"><b>mapFromDevice</b></a> ( const TQSize & s ) const</li>
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<li class=fn>virtual TQPoint <a href="#mapToDevice-2"><b>mapToDevice</b></a> ( const TQPoint &, const TQSize & ) const</li>
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<li class=fn>virtual TQPoint <a href="#mapFromDevice-2"><b>mapFromDevice</b></a> ( const TQPoint &, const TQSize & ) const</li>
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<li class=fn>virtual TQRect <a href="#mapToDevice-3"><b>mapToDevice</b></a> ( const TQRect & r, const TQSize & ) const</li>
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<li class=fn>virtual TQRect <a href="#mapFromDevice-3"><b>mapFromDevice</b></a> ( const TQRect & r, const TQSize & ) const</li>
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<li class=fn>virtual TQImage <a href="#mapToDevice-4"><b>mapToDevice</b></a> ( const TQImage & i ) const</li>
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<li class=fn>virtual TQImage <a href="#mapFromDevice-4"><b>mapFromDevice</b></a> ( const TQImage & i ) const</li>
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<li class=fn>virtual TQRegion <a href="#mapToDevice-5"><b>mapToDevice</b></a> ( const TQRegion & r, const TQSize & ) const</li>
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<li class=fn>virtual TQRegion <a href="#mapFromDevice-5"><b>mapFromDevice</b></a> ( const TQRegion & r, const TQSize & ) const</li>
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<li class=fn>virtual int <a href="#transformOrientation"><b>transformOrientation</b></a> () const</li>
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<li class=fn>virtual bool <a href="#isTransformed"><b>isTransformed</b></a> () const</li>
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<li class=fn>virtual bool <a href="#isInterlaced"><b>isInterlaced</b></a> () const</li>
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<li class=fn>virtual void <a href="#setDirty"><b>setDirty</b></a> ( const TQRect & )</li>
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<li class=fn>int * <a href="#opType"><b>opType</b></a> ()</li>
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<li class=fn>int * <a href="#lastOp"><b>lastOp</b></a> ()</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQScreen class and its descendants manage the framebuffer and
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palette.
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<p> TQScreens act as factories for the screen cursor and TQGfx's. TQLinuxFbScreen
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manages a Linux framebuffer; accelerated drivers subclass TQLinuxFbScreen.
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There can only be one screen in a TQt/Embedded application.
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<p>See also <a href="qws.html">TQt/Embedded</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQScreen"></a>TQScreen::TQScreen ( int display_id )
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</h3>
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Create a screen; the <em>display_id</em> is the number of the TQt/Embedded server
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to connect to.
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<h3 class=fn><a name="~TQScreen"></a>TQScreen::~TQScreen ()<tt> [virtual]</tt>
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</h3>
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Destroys a TQScreen
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<h3 class=fn>int <a name="alloc"></a>TQScreen::alloc ( unsigned int r, unsigned int g, unsigned int b )<tt> [virtual]</tt>
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</h3>
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Given an RGB value <em>r</em> <em>g</em> <em>b</em>, return an index which is the closest
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match to it in the screen's palette. Used in paletted modes only.
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<h3 class=fn>uchar * <a name="base"></a>TQScreen::base () const
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</h3>
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Returns a pointer to the start of the framebuffer.
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<h3 class=fn>void <a name="blank"></a>TQScreen::blank ( bool on )<tt> [virtual]</tt>
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</h3>
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If <em>on</em> is true, blank the screen. Otherwise unblank it.
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<h3 class=fn>uchar * <a name="cache"></a>TQScreen::cache ( int, int )<tt> [virtual]</tt>
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</h3>
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This function is used to store pixmaps in graphics memory for the
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use of the accelerated drivers. See TQLinuxFbScreen (where the cacheing
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is implemented) for more information.
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<h3 class=fn>TQRgb * <a name="clut"></a>TQScreen::clut ()
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</h3>
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Returns the screen's color lookup table (color palette). This is only
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valid in paletted modes (8bpp and lower).
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<h3 class=fn>bool <a name="connect"></a>TQScreen::connect ( const <a href="ntqstring.html">TQString</a> & displaySpec )<tt> [pure virtual]</tt>
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</h3>
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This function is called by every TQt/Embedded application on startup.
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It maps in the framebuffer and in the accelerated drivers the graphics
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card control registers. <em>displaySpec</em> has the following syntax:
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<p>
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<tt>[gfx driver][:driver specific options][:display number]</tt>
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<p>
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for example if you want to use the mach64 driver on fb1 as display 2:
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<p>
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<tt>Mach64:/dev/fb1:2</tt>
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<p>
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<em>displaySpec</em> is passed in via the TQWS_DISPLAY environment variable
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or the -display command line parameter.
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<h3 class=fn>TQGfx * <a name="createGfx"></a>TQScreen::createGfx ( unsigned char * bytes, int w, int h, int d, int linestep )<tt> [virtual]</tt>
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</h3>
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Creates a gfx on an arbitrary buffer <em>bytes</em>, width <em>w</em> and height <em>h</em> in
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pixels, depth <em>d</em> and <em>linestep</em> (length in bytes of each line in the
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buffer). Accelerated drivers can check to see if <em>bytes</em> points into
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graphics memory and create an accelerated Gfx.
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<h3 class=fn>int <a name="depth"></a>TQScreen::depth () const
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</h3>
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Gives the depth in bits per pixel of the framebuffer. This is the number
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of bits each pixel takes up rather than the number of significant bits,
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so 24bpp and 32bpp express the same range of colors (8 bits of
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red, green and blue)
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<h3 class=fn>int <a name="deviceHeight"></a>TQScreen::deviceHeight () const
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</h3>
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Gives the full height of the framebuffer device, as opposed to the
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height which TQt/Embedded will actually use. These can differ if the
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display is centered within the framebuffer.
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<h3 class=fn>int <a name="deviceWidth"></a>TQScreen::deviceWidth () const
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</h3>
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Gives the full width of the framebuffer device, as opposed to the
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width which TQt/Embedded will actually use. These can differ if the
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display is centered within the framebuffer.
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<h3 class=fn>void <a name="disconnect"></a>TQScreen::disconnect ()<tt> [pure virtual]</tt>
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</h3>
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This function is called by every TQt/Embedded application just
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before exitting; it's normally used to unmap the framebuffer.
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<h3 class=fn>int <a name="height"></a>TQScreen::height () const
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</h3>
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Gives the height in pixels of the framebuffer.
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<h3 class=fn>int <a name="initCursor"></a>TQScreen::initCursor ( void * end_of_location, bool init = FALSE )<tt> [virtual]</tt>
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</h3>
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This is used to initialize the software cursor - <em>end_of_location</em>
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points to the address after the area where the cursor image can be stored.
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<em>init</em> is true for the first application this method is called from
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(the TQt/Embedded server), false otherwise.
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<h3 class=fn>bool <a name="initDevice"></a>TQScreen::initDevice ()<tt> [pure virtual]</tt>
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</h3>
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This function is called by the TQt/Embedded server when initializing
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the framebuffer. Accelerated drivers use it to set up the graphics card.
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<h3 class=fn>bool <a name="isInterlaced"></a>TQScreen::isInterlaced () const<tt> [virtual]</tt>
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</h3>
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<p> Returns TRUE if the display is interlaced (for instance a
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television screen); otherwise returns FALSE. If TRUE, drawing is
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altered to look better on such displays.
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<h3 class=fn>bool <a name="isTransformed"></a>TQScreen::isTransformed () const<tt> [virtual]</tt>
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</h3>
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<p> Returns TRUE if the screen is transformed (for instance, rotated
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90 degrees); otherwise returns FALSE. TQScreen's version always
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returns FALSE.
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<h3 class=fn>int * <a name="lastOp"></a>TQScreen::lastOp ()
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</h3>
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<p> Returns the screens last operation.
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<h3 class=fn>int <a name="linestep"></a>TQScreen::linestep () const
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</h3>
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Returns the length in bytes of each scanline of the framebuffer.
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<h3 class=fn><a href="ntqsize.html">TQSize</a> <a name="mapFromDevice"></a>TQScreen::mapFromDevice ( const <a href="ntqsize.html">TQSize</a> & s ) const<tt> [virtual]</tt>
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</h3>
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<p> Map a framebuffer coordinate to the coordinate space used by the
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application. Used by the rotated driver; the TQScreen
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implementation simply returns <em>s</em>.
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<h3 class=fn><a href="ntqpoint.html">TQPoint</a> <a name="mapFromDevice-2"></a>TQScreen::mapFromDevice ( const <a href="ntqpoint.html">TQPoint</a> &, const <a href="ntqsize.html">TQSize</a> & ) const<tt> [virtual]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Map a framebuffer coordinate to the coordinate space used by the
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application. Used by the rotated driver; the TQScreen
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implementation simply returns the point.
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<h3 class=fn><a href="ntqrect.html">TQRect</a> <a name="mapFromDevice-3"></a>TQScreen::mapFromDevice ( const <a href="ntqrect.html">TQRect</a> & r, const <a href="ntqsize.html">TQSize</a> & ) const<tt> [virtual]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Map a framebuffer coordinate to the coordinate space used by the
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application. Used by the rotated driver; the TQScreen
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implementation simply returns <em>r</em>.
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<h3 class=fn><a href="ntqimage.html">TQImage</a> <a name="mapFromDevice-4"></a>TQScreen::mapFromDevice ( const <a href="ntqimage.html">TQImage</a> & i ) const<tt> [virtual]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Transforms an image so that it matches the application coordinate
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space (e.g. rotating it 90 degrees counter-clockwise). The TQScreen
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implementation simply returns <em>i</em>.
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<h3 class=fn><a href="ntqregion.html">TQRegion</a> <a name="mapFromDevice-5"></a>TQScreen::mapFromDevice ( const <a href="ntqregion.html">TQRegion</a> & r, const <a href="ntqsize.html">TQSize</a> & ) const<tt> [virtual]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Transforms a region so that it matches the application coordinate
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space (e.g. rotating it 90 degrees counter-clockwise). The TQScreen
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implementation simply returns <em>r</em>.
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<h3 class=fn><a href="ntqsize.html">TQSize</a> <a name="mapToDevice"></a>TQScreen::mapToDevice ( const <a href="ntqsize.html">TQSize</a> & s ) const<tt> [virtual]</tt>
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</h3>
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<p> Map a user coordinate to the one to actually draw. Used by the
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rotated driver; the TQScreen implementation simply returns <em>s</em>.
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<h3 class=fn><a href="ntqpoint.html">TQPoint</a> <a name="mapToDevice-2"></a>TQScreen::mapToDevice ( const <a href="ntqpoint.html">TQPoint</a> &, const <a href="ntqsize.html">TQSize</a> & ) const<tt> [virtual]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Map a user coordinate to the one to actually draw. Used by the
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rotated driver; the TQScreen implementation simply returns the
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point passed in.
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<h3 class=fn><a href="ntqrect.html">TQRect</a> <a name="mapToDevice-3"></a>TQScreen::mapToDevice ( const <a href="ntqrect.html">TQRect</a> & r, const <a href="ntqsize.html">TQSize</a> & ) const<tt> [virtual]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Map a user coordinate to the one to actually draw. Used by the
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rotated driver; the TQScreen implementation simply returns <em>r</em>.
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<h3 class=fn><a href="ntqimage.html">TQImage</a> <a name="mapToDevice-4"></a>TQScreen::mapToDevice ( const <a href="ntqimage.html">TQImage</a> & i ) const<tt> [virtual]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Transforms an image so that it fits the device coordinate space
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(e.g. rotating it 90 degrees clockwise). The TQScreen
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implementation simply returns <em>i</em>.
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<h3 class=fn><a href="ntqregion.html">TQRegion</a> <a name="mapToDevice-5"></a>TQScreen::mapToDevice ( const <a href="ntqregion.html">TQRegion</a> & r, const <a href="ntqsize.html">TQSize</a> & ) const<tt> [virtual]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Transforms a region so that it fits the device coordinate space
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(e.g. rotating it 90 degrees clockwise). The TQScreen
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implementation simply returns <em>r</em>.
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<h3 class=fn>int <a name="numCols"></a>TQScreen::numCols ()
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</h3>
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Returns the number of entries in the color table returned by <a href="#clut">clut</a>().
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<h3 class=fn>bool <a name="onCard"></a>TQScreen::onCard ( unsigned char * p ) const<tt> [virtual]</tt>
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</h3>
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Returns true if the buffer pointed to by <em>p</em> is within graphics card
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memory, false if it's in main RAM.
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<h3 class=fn>bool <a name="onCard-2"></a>TQScreen::onCard ( unsigned char * p, ulong & offset ) const<tt> [virtual]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> This checks whether the buffer specified by <em>p</em> is on the card
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(as per the other version of onCard) and returns an offset in bytes
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from the start of graphics card memory in <em>offset</em> if it is.
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<h3 class=fn>int * <a name="opType"></a>TQScreen::opType ()
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</h3>
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<p> Returns the screen's operation type.
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|
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<h3 class=fn>int <a name="pixelType"></a>TQScreen::pixelType () const
|
|
</h3>
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|
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|
Returns an integer (taking the same values as TQGfx::PixelType)
|
|
that specifies the pixel storage format of the screen.
|
|
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|
<h3 class=fn>int <a name="pixmapDepth"></a>TQScreen::pixmapDepth () const<tt> [virtual]</tt>
|
|
</h3>
|
|
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|
Gives the preferred depth for pixmaps. By default this is the same
|
|
as the screen depth, but for the VGA16 driver it's 8bpp.
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|
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<h3 class=fn>int <a name="pixmapLinestepAlignment"></a>TQScreen::pixmapLinestepAlignment ()<tt> [virtual]</tt>
|
|
</h3>
|
|
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|
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.
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|
|
|
<h3 class=fn>int <a name="pixmapOffsetAlignment"></a>TQScreen::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>TQScreen::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>TQScreen::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 TQScreen 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>TQGfx * <a name="screenGfx"></a>TQScreen::screenGfx ()<tt> [virtual]</tt>
|
|
</h3>
|
|
Returns a TQGfx (normally a TQGfxRaster) 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>TQScreen::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>TQScreen::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>TQScreen::setDirty ( const <a href="ntqrect.html">TQRect</a> & )<tt> [virtual]</tt>
|
|
</h3>
|
|
|
|
<p> Indicates which section of the screen has been altered. Used by
|
|
the VNC and VFB displays; the TQScreen version does nothing.
|
|
|
|
<h3 class=fn>void <a name="setMode"></a>TQScreen::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>TQScreen::shutdownDevice ()<tt> [virtual]</tt>
|
|
</h3>
|
|
Called by the TQt/Embedded server on shutdown; never called by
|
|
a TQt/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>TQScreen::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>TQScreen::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>TQScreen::transformOrientation () const<tt> [virtual]</tt>
|
|
</h3>
|
|
|
|
<p> Used by the rotated server. The TQScreeen implementation returns 0.
|
|
|
|
<h3 class=fn>void <a name="uncache"></a>TQScreen::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>TQScreen::width () const
|
|
</h3>
|
|
|
|
Gives the width in pixels of the framebuffer.
|
|
|
|
<!-- 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>
|
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</html>
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