magnifier_8c-source.html

在Linux下实现magnification功能

<a name="l00207"></a>00207 }
<a name="l00208"></a>00208 
<a name="l00209"></a><a class="code" href="magnifier_8c.html#1effb419b9c50206adae904343ffc4cb">00209</a> <a class="code" href="magnifier_8c.html#1effb419b9c50206adae904343ffc4cb">BONOBO_TYPE_FUNC</a> (<a class="code" href="structMagLoginHelper.html">MagLoginHelper</a>, 
<a name="l00210"></a>00210                   LOGIN_HELPER_TYPE,
<a name="l00211"></a>00211                   mag_login_helper)
<a name="l00212"></a>00212 
<a name="l00213"></a>00213 gboolean
<a name="l00214"></a>00214 <a class="code" href="magnifier_8h.html#6a0c1b42834a0e68ebbec0835180f06d">magnifier_error_check</a> (<span class="keywordtype">void</span>)
<a name="l00215"></a>00215 {
<a name="l00216"></a>00216         <span class="keywordflow">if</span> (<a class="code" href="magnifier_8c.html#237aa1da92e1a761a63c225868d05a89">_x_error</a>) {
<a name="l00217"></a>00217                 <a class="code" href="magnifier_8c.html#237aa1da92e1a761a63c225868d05a89">_x_error</a> = 0;
<a name="l00218"></a>00218                 <span class="keywordflow">return</span> TRUE;
<a name="l00219"></a>00219         }
<a name="l00220"></a>00220         <span class="keywordflow">return</span> FALSE;
<a name="l00221"></a>00221 }
<a name="l00222"></a>00222 
<a name="l00223"></a>00223 <span class="keyword">static</span> <span class="keywordtype">int</span>
<a name="l00224"></a><a class="code" href="magnifier_8c.html#982b55bded4a2601c71a180a2450e751">00224</a> <a class="code" href="magnifier_8c.html#982b55bded4a2601c71a180a2450e751">magnifier_x_error_handler</a> (Display       *display,
<a name="l00225"></a>00225                            XErrorEvent *error)
<a name="l00226"></a>00226 {
<a name="l00227"></a>00227         <span class="keywordflow">if</span> (error-&gt;error_code == BadAlloc) {
<a name="l00228"></a>00228                 <a class="code" href="magnifier_8c.html#237aa1da92e1a761a63c225868d05a89">_x_error</a> = error-&gt;error_code;
<a name="l00229"></a>00229         }
<a name="l00230"></a>00230         <span class="keywordflow">else</span> {
<a name="l00231"></a>00231                 <span class="keywordflow">return</span> -1;
<a name="l00232"></a>00232         }
<a name="l00233"></a>00233         <span class="keywordflow">return</span> 0;
<a name="l00234"></a>00234 }
<a name="l00235"></a>00235 
<a name="l00236"></a>00236 <span class="keyword">static</span> gboolean
<a name="l00237"></a><a class="code" href="magnifier_8c.html#edb8993025fbfe28b7607a992d48dda9">00237</a> <a class="code" href="magnifier_8c.html#edb8993025fbfe28b7607a992d48dda9">can_open_display</a> (gchar *display_name)
<a name="l00238"></a>00238 {
<a name="l00239"></a>00239     Display *d;
<a name="l00240"></a>00240     <span class="keywordflow">if</span> ((d = XOpenDisplay (display_name)))
<a name="l00241"></a>00241     {
<a name="l00242"></a>00242         XCloseDisplay (d);
<a name="l00243"></a>00243         <span class="keywordflow">return</span> TRUE;
<a name="l00244"></a>00244     }
<a name="l00245"></a>00245     <span class="keywordflow">return</span> FALSE;
<a name="l00246"></a>00246 }
<a name="l00247"></a>00247 
<a name="l00248"></a>00248 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00249"></a><a class="code" href="magnifier_8c.html#09e43f0ebf204ee31031234cf0fe2b33">00249</a> <a class="code" href="magnifier_8c.html#09e43f0ebf204ee31031234cf0fe2b33">magnifier_warp_cursor_to_screen</a> (<a class="code" href="structMagnifier.html">Magnifier</a> *magnifier)
<a name="l00250"></a>00250 {
<a name="l00251"></a>00251         <span class="keywordtype">int</span> x, y, unused_x, unused_y;
<a name="l00252"></a>00252         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> mask;
<a name="l00253"></a>00253         Window root_return, child_return;
<a name="l00254"></a>00254 
<a name="l00255"></a>00255         <span class="keywordflow">if</span> (magnifier-&gt;<a class="code" href="structMagnifier.html#2e085c3a4d47b26635ed0438680f5632">source_display</a>)
<a name="l00256"></a>00256         {
<a name="l00257"></a>00257             <span class="keywordflow">if</span> (!XQueryPointer (GDK_DISPLAY_XDISPLAY (magnifier-&gt;<a class="code" href="structMagnifier.html#2e085c3a4d47b26635ed0438680f5632">source_display</a>), 
<a name="l00258"></a>00258                                 GDK_WINDOW_XWINDOW (magnifier-&gt;<a class="code" href="structMagnifier.html#92b3f715e639bde2e224d91c6801997b">priv</a>-&gt;<a class="code" href="struct__MagnifierPrivate.html#5ab4d39e5bb2aa9bd1fd989de9c50c9e">root</a>), 
<a name="l00259"></a>00259                                 &amp;root_return,
<a name="l00260"></a>00260                                 &amp;child_return,
<a name="l00261"></a>00261                                 &amp;x, &amp;y,
<a name="l00262"></a>00262                                 &amp;unused_x, &amp;unused_y,
<a name="l00263"></a>00263                                 &amp;mask))
<a name="l00264"></a>00264             {
<a name="l00265"></a>00265                 XWarpPointer (GDK_DISPLAY_XDISPLAY (magnifier-&gt;<a class="code" href="structMagnifier.html#2e085c3a4d47b26635ed0438680f5632">source_display</a>),
<a name="l00266"></a>00266                               None,
<a name="l00267"></a>00267                               GDK_WINDOW_XWINDOW (magnifier-&gt;<a class="code" href="structMagnifier.html#92b3f715e639bde2e224d91c6801997b">priv</a>-&gt;<a class="code" href="struct__MagnifierPrivate.html#5ab4d39e5bb2aa9bd1fd989de9c50c9e">root</a>),
<a name="l00268"></a>00268                               0, 0, 0, 0,
<a name="l00269"></a>00269                               x, y);
<a name="l00270"></a>00270                 XSync (GDK_DISPLAY_XDISPLAY (magnifier-&gt;<a class="code" href="structMagnifier.html#2e085c3a4d47b26635ed0438680f5632">source_display</a>), FALSE);
<a name="l00271"></a>00271             }
<a name="l00272"></a>00272         }
<a name="l00273"></a>00273 }
<a name="l00274"></a>00274 
<a name="l00275"></a>00275 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00276"></a><a class="code" href="magnifier_8c.html#6d5dc2be3ea6ec00831ebed5670ee169">00276</a> <a class="code" href="magnifier_8c.html#6d5dc2be3ea6ec00831ebed5670ee169">magnifier_zoom_regions_mark_dirty</a> (<a class="code" href="structMagnifier.html">Magnifier</a> *magnifier, <a class="code" href="structGNOME__Magnifier__RectBounds__type.html">GNOME_Magnifier_RectBounds</a> rect_bounds)
<a name="l00277"></a>00277 {
<a name="l00278"></a>00278         GList *list;
<a name="l00279"></a>00279 
<a name="l00280"></a>00280         g_assert (magnifier);
<a name="l00281"></a>00281 
<a name="l00282"></a>00282         list = magnifier-&gt;<a class="code" href="structMagnifier.html#af346b45e0ceb935adaeeb9821ca16c3">zoom_regions</a>;
<a name="l00283"></a>00283         <span class="keywordflow">while</span> (list) 
<a name="l00284"></a>00284         {
<a name="l00285"></a>00285                 <span class="comment">/* propagate the expose events to the zoom regions */</span>
<a name="l00286"></a>00286                 <a class="code" href="GNOME__Magnifier_8h.html#47a2db1506250f354913a189dfa1bb36">GNOME_Magnifier_ZoomRegion</a> <a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>;
<a name="l00287"></a>00287                 CORBA_Environment ev;
<a name="l00288"></a>00288                 zoom_region = list-&gt;data;
<a name="l00289"></a>00289                 CORBA_exception_init (&amp;ev);
<a name="l00290"></a>00290                 <span class="keywordflow">if</span> (zoom_region)
<a name="l00291"></a>00291                         <a class="code" href="GNOME__Magnifier-stubs_8c.html#2ddf6526a713e2daaa1894da204c1a40">GNOME_Magnifier_ZoomRegion_markDirty</a> (CORBA_Object_duplicate (zoom_region, &amp;ev),
<a name="l00292"></a>00292                                                               &amp;rect_bounds,
<a name="l00293"></a>00293                                                               &amp;ev);
<a name="l00294"></a>00294                 list = g_list_next (list);
<a name="l00295"></a>00295         }
<a name="l00296"></a>00296 }
<a name="l00297"></a>00297 
<a name="l00298"></a>00298 <span class="keywordtype">void</span>
<a name="l00299"></a><a class="code" href="magnifier_8h.html#ce0cb09a2b2cb21339ec9cd2b4c74618">00299</a> <a class="code" href="magnifier_8c.html#ce0cb09a2b2cb21339ec9cd2b4c74618">magnifier_set_cursor_from_pixbuf</a> (<a class="code" href="structMagnifier.html">Magnifier</a> *magnifier, GdkPixbuf *cursor_pixbuf)
<a name="l00300"></a>00300 {
<a name="l00301"></a>00301         GdkPixmap *pixmap, *mask;
<a name="l00302"></a>00302         gint width, height;
<a name="l00303"></a>00303         GdkGC *gc;
<a name="l00304"></a>00304         GdkDrawable *drawable = magnifier-&gt;<a class="code" href="structMagnifier.html#92b3f715e639bde2e224d91c6801997b">priv</a>-&gt;<a class="code" href="struct__MagnifierPrivate.html#f3b6cd2853b2554d2b9429eb5f021eef">w</a>-&gt;window;
<a name="l00305"></a>00305 
<a name="l00306"></a>00306         <span class="keywordflow">if</span> (magnifier-&gt;<a class="code" href="structMagnifier.html#92b3f715e639bde2e224d91c6801997b">priv</a>-&gt;<a class="code" href="struct__MagnifierPrivate.html#adc149b6251214598ded61e94701c72a">cursor</a>) {
<a name="l00307"></a>00307                 g_object_unref (magnifier-&gt;<a class="code" href="structMagnifier.html#92b3f715e639bde2e224d91c6801997b">priv</a>-&gt;<a class="code" href="struct__MagnifierPrivate.html#adc149b6251214598ded61e94701c72a">cursor</a>);
<a name="l00308"></a>00308                 magnifier-&gt;<a class="code" href="structMagnifier.html#92b3f715e639bde2e224d91c6801997b">priv</a>-&gt;<a class="code" href="struct__MagnifierPrivate.html#adc149b6251214598ded61e94701c72a">cursor</a> = NULL;
<a name="l00309"></a>00309         }
<a name="l00310"></a>00310         <span class="keywordflow">if</span> (drawable &amp;&amp; cursor_pixbuf)
<a name="l00311"></a>00311         {
<a name="l00312"></a>00312                 <span class="keyword">const</span> gchar *xhot_string = NULL, *yhot_string = NULL;
<a name="l00313"></a>00313                 width = gdk_pixbuf_get_width (cursor_pixbuf);
<a name="l00314"></a>00314                 height = gdk_pixbuf_get_height (cursor_pixbuf);
<a name="l00315"></a>00315                 pixmap = gdk_pixmap_new (drawable, width, height, -1);
<a name="l00316"></a>00316                 gc = gdk_gc_new (pixmap);
<a name="l00317"></a>00317                 <span class="keywordflow">if</span> (GDK_IS_DRAWABLE (pixmap))
<a name="l00318"></a>00318                     gdk_draw_pixbuf (pixmap, gc, cursor_pixbuf, 0, 0, 0, 0, 
<a name="l00319"></a>00319                                      width, height,
<a name="l00320"></a>00320                                      GDK_RGB_DITHER_NONE, 0, 0);