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<title>Graphics/X11/Xlib/Context.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : Graphics.X11.Xlib.Context</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Alastair Reid, 1999-2003</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD-style (see the file libraries/base/LICENSE)</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : libraries@haskell.org</span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- A collection of FFI declarations for interfacing with Xlib Graphics</span>
<a name="line-12"></a><span class='hs-comment'>-- Contexts.</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-15"></a>
<a name="line-16"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>X11</span><span class='hs-varop'>.</span><span class='hs-conid'>Xlib</span><span class='hs-varop'>.</span><span class='hs-conid'>Context</span><span class='hs-layout'>(</span>
<a name="line-17"></a>
<a name="line-18"></a> <span class='hs-varid'>setArcMode</span><span class='hs-layout'>,</span>
<a name="line-19"></a> <span class='hs-varid'>setBackground</span><span class='hs-layout'>,</span>
<a name="line-20"></a> <span class='hs-varid'>setForeground</span><span class='hs-layout'>,</span>
<a name="line-21"></a> <span class='hs-varid'>setFunction</span><span class='hs-layout'>,</span>
<a name="line-22"></a> <span class='hs-varid'>setGraphicsExposures</span><span class='hs-layout'>,</span>
<a name="line-23"></a> <span class='hs-varid'>setClipMask</span><span class='hs-layout'>,</span>
<a name="line-24"></a> <span class='hs-varid'>setClipOrigin</span><span class='hs-layout'>,</span>
<a name="line-25"></a> <span class='hs-varid'>setDashes</span><span class='hs-layout'>,</span>
<a name="line-26"></a> <span class='hs-varid'>setFillRule</span><span class='hs-layout'>,</span>
<a name="line-27"></a> <span class='hs-varid'>setFillStyle</span><span class='hs-layout'>,</span>
<a name="line-28"></a> <span class='hs-varid'>setFont</span><span class='hs-layout'>,</span>
<a name="line-29"></a> <span class='hs-varid'>setLineAttributes</span><span class='hs-layout'>,</span>
<a name="line-30"></a> <span class='hs-varid'>setPlaneMask</span><span class='hs-layout'>,</span>
<a name="line-31"></a> <span class='hs-varid'>setState</span><span class='hs-layout'>,</span>
<a name="line-32"></a> <span class='hs-varid'>setStipple</span><span class='hs-layout'>,</span>
<a name="line-33"></a> <span class='hs-varid'>setSubwindowMode</span><span class='hs-layout'>,</span>
<a name="line-34"></a> <span class='hs-varid'>setTSOrigin</span><span class='hs-layout'>,</span>
<a name="line-35"></a> <span class='hs-varid'>setTile</span><span class='hs-layout'>,</span>
<a name="line-36"></a> <span class='hs-varid'>createGC</span><span class='hs-layout'>,</span>
<a name="line-37"></a> <span class='hs-varid'>gContextFromGC</span><span class='hs-layout'>,</span>
<a name="line-38"></a> <span class='hs-varid'>freeGC</span><span class='hs-layout'>,</span>
<a name="line-39"></a> <span class='hs-varid'>flushGC</span><span class='hs-layout'>,</span>
<a name="line-40"></a> <span class='hs-varid'>copyGC</span><span class='hs-layout'>,</span>
<a name="line-41"></a>
<a name="line-42"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-43"></a>
<a name="line-44"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>X11</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span>
<a name="line-45"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>X11</span><span class='hs-varop'>.</span><span class='hs-conid'>Xlib</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span>
<a name="line-46"></a>
<a name="line-47"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span>
<a name="line-48"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>C</span>
<a name="line-49"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>C</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span>
<a name="line-50"></a>
<a name="line-51"></a><span class='hs-comment'>----------------------------------------------------------------</span>
<a name="line-52"></a><span class='hs-comment'>-- Graphics contexts</span>
<a name="line-53"></a><span class='hs-comment'>----------------------------------------------------------------</span>
<a name="line-54"></a>
<a name="line-55"></a><span class='hs-comment'>-- Convenience functions</span>
<a name="line-56"></a>
<a name="line-57"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetArcMode()@.</span>
<a name="line-58"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetArcMode"</span>
<a name="line-59"></a> <span class='hs-varid'>setArcMode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ArcMode</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-60"></a>
<a name="line-61"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetBackground()@.</span>
<a name="line-62"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetBackground"</span>
<a name="line-63"></a> <span class='hs-varid'>setBackground</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pixel</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-64"></a>
<a name="line-65"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetForeground()@.</span>
<a name="line-66"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetForeground"</span>
<a name="line-67"></a> <span class='hs-varid'>setForeground</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pixel</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-68"></a>
<a name="line-69"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetFunction()@.</span>
<a name="line-70"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetFunction"</span>
<a name="line-71"></a> <span class='hs-varid'>setFunction</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GXFunction</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-72"></a>
<a name="line-73"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetGraphicsExposures()@.</span>
<a name="line-74"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetGraphicsExposures"</span>
<a name="line-75"></a> <span class='hs-varid'>setGraphicsExposures</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-76"></a>
<a name="line-77"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetClipMask()@.</span>
<a name="line-78"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetClipMask"</span>
<a name="line-79"></a> <span class='hs-varid'>setClipMask</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pixmap</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-80"></a>
<a name="line-81"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetClipOrigin()@.</span>
<a name="line-82"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetClipOrigin"</span>
<a name="line-83"></a> <span class='hs-varid'>setClipOrigin</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-84"></a>
<a name="line-85"></a><span class='hs-comment'>-- XSetClipRectangles omitted because it's not clear when it's safe to delete the</span>
<a name="line-86"></a><span class='hs-comment'>-- array of rectangles</span>
<a name="line-87"></a>
<a name="line-88"></a><a name="setDashes"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetDashes()@.</span>
<a name="line-89"></a><span class='hs-definition'>setDashes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-90"></a><span class='hs-definition'>setDashes</span> <span class='hs-varid'>display</span> <span class='hs-varid'>gc</span> <span class='hs-varid'>dash_offset</span> <span class='hs-varid'>dashes</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span>
<a name="line-91"></a> <span class='hs-varid'>withCString</span> <span class='hs-varid'>dashes</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>dash_list</span> <span class='hs-keyglyph'>-></span>
<a name="line-92"></a> <span class='hs-varid'>xSetDashes</span> <span class='hs-varid'>display</span> <span class='hs-varid'>gc</span> <span class='hs-varid'>dash_offset</span> <span class='hs-varid'>dash_list</span> <span class='hs-varid'>n</span>
<a name="line-93"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetDashes"</span>
<a name="line-94"></a> <span class='hs-varid'>xSetDashes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CString</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-95"></a>
<a name="line-96"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetFillRule()@.</span>
<a name="line-97"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetFillRule"</span>
<a name="line-98"></a> <span class='hs-varid'>setFillRule</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FillRule</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-99"></a>
<a name="line-100"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetFillStyle()@.</span>
<a name="line-101"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetFillStyle"</span>
<a name="line-102"></a> <span class='hs-varid'>setFillStyle</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FillStyle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-103"></a>
<a name="line-104"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetFont()@.</span>
<a name="line-105"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetFont"</span>
<a name="line-106"></a> <span class='hs-varid'>setFont</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Font</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-107"></a>
<a name="line-108"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetLineAttributes()@.</span>
<a name="line-109"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetLineAttributes"</span>
<a name="line-110"></a> <span class='hs-varid'>setLineAttributes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LineStyle</span> <span class='hs-keyglyph'>-></span>
<a name="line-111"></a> <span class='hs-conid'>CapStyle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>JoinStyle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-112"></a>
<a name="line-113"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetPlaneMask()@.</span>
<a name="line-114"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetPlaneMask"</span>
<a name="line-115"></a> <span class='hs-varid'>setPlaneMask</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pixel</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-116"></a>
<a name="line-117"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetState()@.</span>
<a name="line-118"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetState"</span>
<a name="line-119"></a> <span class='hs-varid'>setState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pixel</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pixel</span> <span class='hs-keyglyph'>-></span>
<a name="line-120"></a> <span class='hs-conid'>GXFunction</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pixel</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-121"></a>
<a name="line-122"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetStipple()@.</span>
<a name="line-123"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetStipple"</span>
<a name="line-124"></a> <span class='hs-varid'>setStipple</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pixmap</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-125"></a>
<a name="line-126"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetSubwindowMode()@.</span>
<a name="line-127"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetSubwindowMode"</span>
<a name="line-128"></a> <span class='hs-varid'>setSubwindowMode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SubWindowMode</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-129"></a>
<a name="line-130"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetTSOrigin()@.</span>
<a name="line-131"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetTSOrigin"</span>
<a name="line-132"></a> <span class='hs-varid'>setTSOrigin</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-133"></a>
<a name="line-134"></a><span class='hs-comment'>-- | interface to the X11 library function @XSetTile()@.</span>
<a name="line-135"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XSetTile"</span>
<a name="line-136"></a> <span class='hs-varid'>setTile</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pixmap</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-137"></a>
<a name="line-138"></a><a name="createGC"></a><span class='hs-comment'>-- ToDo: create a real interface to this</span>
<a name="line-139"></a><span class='hs-comment'>-- | partial interface to the X11 library function @XCreateGC()@.</span>
<a name="line-140"></a><span class='hs-definition'>createGC</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Drawable</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>GC</span>
<a name="line-141"></a><span class='hs-definition'>createGC</span> <span class='hs-varid'>display</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>xCreateGC</span> <span class='hs-varid'>display</span> <span class='hs-varid'>d</span> <span class='hs-num'>0</span> <span class='hs-varid'>nullPtr</span>
<a name="line-142"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XCreateGC"</span>
<a name="line-143"></a> <span class='hs-varid'>xCreateGC</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Drawable</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ValueMask</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>GCValues</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>GC</span>
<a name="line-144"></a>
<a name="line-145"></a><a name="ValueMask"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>ValueMask</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Word32</span>
<a name="line-146"></a>
<a name="line-147"></a><span class='hs-comment'>-- OLD:</span>
<a name="line-148"></a><span class='hs-comment'>-- %synonym : GCValueSet : Ptr</span>
<a name="line-149"></a><span class='hs-comment'>-- in rtsDummy</span>
<a name="line-150"></a><span class='hs-comment'>--</span>
<a name="line-151"></a><span class='hs-comment'>-- {%</span>
<a name="line-152"></a><span class='hs-comment'>-- typedef unsigned long GCMask; /* cf XtGCMask */</span>
<a name="line-153"></a><span class='hs-comment'>-- typedef struct _gcvalues {</span>
<a name="line-154"></a><span class='hs-comment'>-- GCMask mask;</span>
<a name="line-155"></a><span class='hs-comment'>-- XGCValues values;</span>
<a name="line-156"></a><span class='hs-comment'>-- }* GCValueSet;</span>
<a name="line-157"></a><span class='hs-comment'>-- %}</span>
<a name="line-158"></a><span class='hs-comment'>--</span>
<a name="line-159"></a><span class='hs-comment'>-- IMPURE GCValueSet emptyGCValueSet()</span>
<a name="line-160"></a><span class='hs-comment'>-- RESULT: (RETVAL = (GCValueSet) malloc(sizeof(struct _gcvalues))) ? RETVAL->mask = 0, RETVAL : RETVAL;</span>
<a name="line-161"></a><span class='hs-comment'>-- POST: RETVAL != NULL</span>
<a name="line-162"></a><span class='hs-comment'>--</span>
<a name="line-163"></a><span class='hs-comment'>-- IMPURE void setGCForeground(colour, set)</span>
<a name="line-164"></a><span class='hs-comment'>-- IN Pixel colour</span>
<a name="line-165"></a><span class='hs-comment'>-- IN GCValueSet set</span>
<a name="line-166"></a><span class='hs-comment'>-- RESULT: set->mask |= GCForeground; set->values.foreground = colour</span>
<a name="line-167"></a><span class='hs-comment'>--</span>
<a name="line-168"></a><span class='hs-comment'>-- IMPURE void setGCBackground(colour, set)</span>
<a name="line-169"></a><span class='hs-comment'>-- IN Pixel colour</span>
<a name="line-170"></a><span class='hs-comment'>-- IN GCValueSet set</span>
<a name="line-171"></a><span class='hs-comment'>-- RESULT: set->mask |= GCBackground; set->values.background = colour</span>
<a name="line-172"></a><span class='hs-comment'>--</span>
<a name="line-173"></a><span class='hs-comment'>-- IMPURE void freeGCValueSet(set)</span>
<a name="line-174"></a><span class='hs-comment'>-- IN GCValueSet set</span>
<a name="line-175"></a><span class='hs-comment'>-- RESULT: free(set)</span>
<a name="line-176"></a><span class='hs-comment'>--</span>
<a name="line-177"></a><span class='hs-comment'>-- IMPURE GC XCreateGC(display, d, set->mask, &(set->values))</span>
<a name="line-178"></a><span class='hs-comment'>-- NAME: xCreateGC</span>
<a name="line-179"></a><span class='hs-comment'>-- IN Display* display</span>
<a name="line-180"></a><span class='hs-comment'>-- IN Drawable d</span>
<a name="line-181"></a><span class='hs-comment'>-- IN GCValueSet set</span>
<a name="line-182"></a><span class='hs-comment'>--</span>
<a name="line-183"></a><span class='hs-comment'>-- IMPURE void XChangeGC(display, gc, set->mask, &(set->values))</span>
<a name="line-184"></a><span class='hs-comment'>-- NAME: xChangeGC</span>
<a name="line-185"></a><span class='hs-comment'>-- IN Display* display</span>
<a name="line-186"></a><span class='hs-comment'>-- IN GC gc</span>
<a name="line-187"></a><span class='hs-comment'>-- IN GCValueSet set</span>
<a name="line-188"></a><span class='hs-comment'>--</span>
<a name="line-189"></a><span class='hs-comment'>-- STARTH</span>
<a name="line-190"></a><span class='hs-comment'>-- -- Code that packages GCValueSets up in a clean monoidic way.</span>
<a name="line-191"></a><span class='hs-comment'>--</span>
<a name="line-192"></a><span class='hs-comment'>-- data GCSetter = GCSetter (GCValueSet -> IO ()) -- should be newtype</span>
<a name="line-193"></a><span class='hs-comment'>--</span>
<a name="line-194"></a><span class='hs-comment'>-- createGC :: Display -> Drawable -> GCSetter -> IO GC</span>
<a name="line-195"></a><span class='hs-comment'>-- createGC display d (GCSetter setter) =</span>
<a name="line-196"></a><span class='hs-comment'>-- emptyGCValueSet >>= \ set -></span>
<a name="line-197"></a><span class='hs-comment'>-- setter set >></span>
<a name="line-198"></a><span class='hs-comment'>-- xCreateGC display d set >>= \ gc -></span>
<a name="line-199"></a><span class='hs-comment'>-- freeGCValueSet set >></span>
<a name="line-200"></a><span class='hs-comment'>-- return gc</span>
<a name="line-201"></a><span class='hs-comment'>--</span>
<a name="line-202"></a><span class='hs-comment'>-- changeGC :: Display -> Drawable -> GC -> GCSetter -> IO ()</span>
<a name="line-203"></a><span class='hs-comment'>-- changeGC display d gc (GCSetter setter) =</span>
<a name="line-204"></a><span class='hs-comment'>-- emptyGCValueSet >>= \ set -></span>
<a name="line-205"></a><span class='hs-comment'>-- setter set >></span>
<a name="line-206"></a><span class='hs-comment'>-- xChangeGC display d set >>= \ gc -></span>
<a name="line-207"></a><span class='hs-comment'>-- freeGCValueSet set</span>
<a name="line-208"></a><span class='hs-comment'>--</span>
<a name="line-209"></a><span class='hs-comment'>-- instance Monoid GCSetter where</span>
<a name="line-210"></a><span class='hs-comment'>-- (GCSetter m) >>> (GCSetter k)</span>
<a name="line-211"></a><span class='hs-comment'>-- = GCSetter (\ settings -> m settings >> k settings)</span>
<a name="line-212"></a><span class='hs-comment'>-- unit = GCSetter (\ _ -> return ())</span>
<a name="line-213"></a><span class='hs-comment'>--</span>
<a name="line-214"></a><span class='hs-comment'>-- set_Background :: Pixel -> GCSetter</span>
<a name="line-215"></a><span class='hs-comment'>-- set_Background c = GCSetter (setGCBackground c)</span>
<a name="line-216"></a><span class='hs-comment'>--</span>
<a name="line-217"></a><span class='hs-comment'>-- set_Foreground :: Pixel -> GCSetter</span>
<a name="line-218"></a><span class='hs-comment'>-- set_Foreground c = GCSetter (setGCForeground c)</span>
<a name="line-219"></a><span class='hs-comment'>-- ENDH</span>
<a name="line-220"></a>
<a name="line-221"></a><span class='hs-comment'>-- | interface to the X11 library function @XGContextFromGC()@.</span>
<a name="line-222"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XGContextFromGC"</span>
<a name="line-223"></a> <span class='hs-varid'>gContextFromGC</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GContext</span>
<a name="line-224"></a>
<a name="line-225"></a><span class='hs-comment'>-- | interface to the X11 library function @XFreeGC()@.</span>
<a name="line-226"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XFreeGC"</span>
<a name="line-227"></a> <span class='hs-varid'>freeGC</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-228"></a>
<a name="line-229"></a><span class='hs-comment'>-- | interface to the X11 library function @XFlushGC()@.</span>
<a name="line-230"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XFlushGC"</span>
<a name="line-231"></a> <span class='hs-varid'>flushGC</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-232"></a>
<a name="line-233"></a><span class='hs-comment'>-- | interface to the X11 library function @XCopyGC()@.</span>
<a name="line-234"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"HsXlib.h XCopyGC"</span>
<a name="line-235"></a> <span class='hs-varid'>copyGC</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Display</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Mask</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GC</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-236"></a>
<a name="line-237"></a><span class='hs-comment'>----------------------------------------------------------------</span>
<a name="line-238"></a><span class='hs-comment'>-- End</span>
<a name="line-239"></a><span class='hs-comment'>----------------------------------------------------------------</span>
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