magnifier-main_8c-source.html

在Linux下实现magnification功能

<a name="l00169"></a>00169         <a class="code" href="GNOME__Magnifier_8h.html#7804bd3fd4edd2aae1f9daf2dfc94524">Bonobo_PropertyBag</a> properties;
<a name="l00170"></a>00170         CORBA_Environment ev;
<a name="l00171"></a>00171         <a class="code" href="structGNOME__Magnifier__RectBounds__type.html">GNOME_Magnifier_RectBounds</a> roi;
<a name="l00172"></a>00172         <span class="keywordtype">int</span> x_roi, y_roi;
<a name="l00173"></a>00173 
<a name="l00174"></a>00174         <span class="comment">/* Only iterate the number of times specified */</span>
<a name="l00175"></a>00175         <span class="keywordflow">if</span> (<a class="code" href="magnifier-main_8c.html#b4d2b03157ec9554d008ee134e28172c">global_options</a>.<a class="code" href="structMagnifierOptions.html#a8079ebec7dc413e42b4cc31e5023a4b">timing_iterations</a> &gt; 0) {
<a name="l00176"></a>00176                 <span class="keywordflow">if</span> (timing_counter &gt; <a class="code" href="magnifier-main_8c.html#b4d2b03157ec9554d008ee134e28172c">global_options</a>.<a class="code" href="structMagnifierOptions.html#a8079ebec7dc413e42b4cc31e5023a4b">timing_iterations</a>) {
<a name="l00177"></a>00177                         CORBA_exception_init (&amp;ev);
<a name="l00178"></a>00178                         properties = <a class="code" href="GNOME__Magnifier-stubs_8c.html#c78f67754e01769f66bed39db2b6ee33">GNOME_Magnifier_ZoomRegion_getProperties</a> (<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>, &amp;ev);
<a name="l00179"></a>00179                         <span class="keywordflow">if</span> (BONOBO_EX (&amp;ev))
<a name="l00180"></a>00180                                 fprintf (stderr, <span class="stringliteral">"EXCEPTION\n"</span>);
<a name="l00181"></a>00181 
<a name="l00182"></a>00182                         bonobo_pbclient_set_boolean (properties, <span class="stringliteral">"exit-magnifier"</span>,
<a name="l00183"></a>00183                                        TRUE, &amp;ev);
<a name="l00184"></a>00184                 }
<a name="l00185"></a>00185         }
<a name="l00186"></a>00186 
<a name="l00187"></a>00187         CORBA_exception_init (&amp;ev);
<a name="l00188"></a>00188 
<a name="l00189"></a>00189         x_roi  = <a class="code" href="magnifier-main_8c.html#b4d2b03157ec9554d008ee134e28172c">global_options</a>.<a class="code" href="structMagnifierOptions.html#c719917bdc9caff26d923f34a88b0887">timing_delta_x</a> * timing_x_pos;
<a name="l00190"></a>00190         roi.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#da72b580c4e14d8f1dcd85b2da3a8759">x1</a> = x_roi;
<a name="l00191"></a>00191         roi.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#721fd6fb9a4c3c6c3813402b31de633a">x2</a> = (<a class="code" href="magnifier-main_8c.html#a4d434a8b93410ea0ed660e48dac41c6">screen_width</a> / <a class="code" href="magnifier-main_8c.html#b4d2b03157ec9554d008ee134e28172c">global_options</a>.<a class="code" href="structMagnifierOptions.html#002ef34f3ec4073b1a3cdfb9c8378105">zoom_factor</a>) + roi.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#da72b580c4e14d8f1dcd85b2da3a8759">x1</a>;
<a name="l00192"></a>00192         x_roi  = <a class="code" href="magnifier-main_8c.html#b4d2b03157ec9554d008ee134e28172c">global_options</a>.<a class="code" href="structMagnifierOptions.html#c719917bdc9caff26d923f34a88b0887">timing_delta_x</a> * (timing_x_pos + x_direction);
<a name="l00193"></a>00193 
<a name="l00194"></a>00194         <span class="comment">/* Determine if magnifier hit an edge and should reverse direction */</span>
<a name="l00195"></a>00195         <span class="keywordflow">if</span> (x_roi + (<a class="code" href="magnifier-main_8c.html#a4d434a8b93410ea0ed660e48dac41c6">screen_width</a> / <a class="code" href="magnifier-main_8c.html#b4d2b03157ec9554d008ee134e28172c">global_options</a>.<a class="code" href="structMagnifierOptions.html#002ef34f3ec4073b1a3cdfb9c8378105">zoom_factor</a>) &gt; <a class="code" href="magnifier-main_8c.html#a4d434a8b93410ea0ed660e48dac41c6">screen_width</a>)
<a name="l00196"></a>00196                 x_direction = -1;
<a name="l00197"></a>00197         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (x_roi &lt; 0)
<a name="l00198"></a>00198                 x_direction = 1;
<a name="l00199"></a>00199 
<a name="l00200"></a>00200         timing_x_pos += x_direction;
<a name="l00201"></a>00201 
<a name="l00202"></a>00202         y_roi = <a class="code" href="magnifier-main_8c.html#b4d2b03157ec9554d008ee134e28172c">global_options</a>.<a class="code" href="structMagnifierOptions.html#2a0ccfc882c403b2bae0d2cea8ae9c76">timing_delta_y</a> * timing_y_pos;
<a name="l00203"></a>00203 
<a name="l00204"></a>00204         <span class="comment">/* Calculate size of screen not covered by magnifier */</span>
<a name="l00205"></a>00205         <span class="keywordflow">if</span> (<a class="code" href="magnifier-main_8c.html#b4d2b03157ec9554d008ee134e28172c">global_options</a>.<a class="code" href="structMagnifierOptions.html#0869c5d254017a23c3e77e0026c144ba">horizontal_split</a>)
<a name="l00206"></a>00206                 roi.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#24de0d98768b0b42dc53ab51950760c0">y1</a> = y_roi + <a class="code" href="magnifier-main_8c.html#3b4a1bd850991355b91c7bfc15247d49">screen_height</a>;
<a name="l00207"></a>00207         <span class="keywordflow">else</span>
<a name="l00208"></a>00208                 roi.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#24de0d98768b0b42dc53ab51950760c0">y1</a> = y_roi;
<a name="l00209"></a>00209         roi.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#3ba20b4c1f0db87a1b9f21169e20b5f3">y2</a> = (screen_height / <a class="code" href="magnifier-main_8c.html#b4d2b03157ec9554d008ee134e28172c">global_options</a>.<a class="code" href="structMagnifierOptions.html#002ef34f3ec4073b1a3cdfb9c8378105">zoom_factor</a>) + roi.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#24de0d98768b0b42dc53ab51950760c0">y1</a>;
<a name="l00210"></a>00210 
<a name="l00211"></a>00211         y_roi = <a class="code" href="magnifier-main_8c.html#b4d2b03157ec9554d008ee134e28172c">global_options</a>.<a class="code" href="structMagnifierOptions.html#2a0ccfc882c403b2bae0d2cea8ae9c76">timing_delta_y</a> * (timing_y_pos + y_direction);
<a name="l00212"></a>00212 
<a name="l00213"></a>00213         <span class="comment">/* The counter is increased each time the y-direction changes */</span>
<a name="l00214"></a>00214         <span class="keywordflow">if</span> (y_roi + (screen_height / <a class="code" href="magnifier-main_8c.html#b4d2b03157ec9554d008ee134e28172c">global_options</a>.<a class="code" href="structMagnifierOptions.html#002ef34f3ec4073b1a3cdfb9c8378105">zoom_factor</a>) &gt; screen_height) {
<a name="l00215"></a>00215                 timing_counter++;
<a name="l00216"></a>00216                 y_direction = -1;
<a name="l00217"></a>00217         }
<a name="l00218"></a>00218         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (y_roi &lt; 0) {
<a name="l00219"></a>00219                 timing_counter++;
<a name="l00220"></a>00220                 y_direction = 1;
<a name="l00221"></a>00221         }
<a name="l00222"></a>00222 
<a name="l00223"></a>00223         timing_y_pos += y_direction;
<a name="l00224"></a>00224 
<a name="l00225"></a>00225         <span class="keywordflow">if</span> (!<a class="code" href="magnifier_8h.html#971fc276bc83e8071c4b450136ac5d5c">IS_MAGNIFIER</a> (magnifier))
<a name="l00226"></a>00226                 <span class="keywordflow">return</span> FALSE;
<a name="l00227"></a>00227 
<a name="l00228"></a>00228         magnifier-&gt;priv-&gt;cursor_x = (roi.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#721fd6fb9a4c3c6c3813402b31de633a">x2</a> + roi.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#da72b580c4e14d8f1dcd85b2da3a8759">x1</a>) / 2;
<a name="l00229"></a>00229         magnifier-&gt;priv-&gt;cursor_y = (roi.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#3ba20b4c1f0db87a1b9f21169e20b5f3">y2</a> + roi.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#24de0d98768b0b42dc53ab51950760c0">y1</a>) / 2;
<a name="l00230"></a>00230 
<a name="l00231"></a>00231         zoom_regions =
<a name="l00232"></a>00232                 <a class="code" href="GNOME__Magnifier-stubs_8c.html#c33a7910d9b85a8028dcca5cbd95641d">GNOME_Magnifier_Magnifier_getZoomRegions</a> (
<a name="l00233"></a>00233                         BONOBO_OBJREF (magnifier),
<a name="l00234"></a>00234                         &amp;ev);
<a name="l00235"></a>00235 
<a name="l00236"></a>00236         <span class="keywordflow">if</span> (zoom_regions &amp;&amp; (zoom_regions-&gt;<a class="code" href="structCORBA__sequence__CORBA__Object.html#1c9d5e101124da8d205b44b0cec055fd">_length</a> &gt; 0)) {
<a name="l00237"></a>00237 
<a name="l00238"></a>00238                 <a class="code" href="GNOME__Magnifier-stubs_8c.html#83228cd517d6b914e6b19ed5ead36171">GNOME_Magnifier_ZoomRegion_setROI</a> (
<a name="l00239"></a>00239                         zoom_regions-&gt;<a class="code" href="structCORBA__sequence__CORBA__Object.html#83bd7017c176eb283bae20b433c602dd">_buffer</a>[0], &amp;roi, &amp;ev);
<a name="l00240"></a>00240         }
<a name="l00241"></a>00241 
<a name="l00242"></a>00242         <span class="keywordflow">return</span> TRUE;
<a name="l00243"></a>00243 }
<a name="l00244"></a>00244 
<a name="l00245"></a><a class="code" href="magnifier-main_8c.html#31e24c11fe7b55913887a78bff6ed30e">00245</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="magnifier-main_8c.html#bbf254766520cad4d7fe189eb184194c">last_x</a> = 0, <a class="code" href="magnifier-main_8c.html#31e24c11fe7b55913887a78bff6ed30e">last_y</a> = 0;
<a name="l00246"></a>00246 
<a name="l00247"></a>00247 <span class="keyword">static</span> <span class="keywordtype">int</span>
<a name="l00248"></a><a class="code" href="magnifier-main_8c.html#b22ec9608227fbe62818f04b27d2f639">00248</a> <a class="code" href="magnifier-main_8c.html#b22ec9608227fbe62818f04b27d2f639">magnifier_main_pan_image</a> (gpointer data)
<a name="l00249"></a>00249 {
<a name="l00250"></a>00250   <a class="code" href="structMagnifier.html">Magnifier</a> *magnifier = (<a class="code" href="structMagnifier.html">Magnifier</a> *) data;
<a name="l00251"></a>00251   <a class="code" href="structCORBA__sequence__CORBA__Object.html">GNOME_Magnifier_ZoomRegionList</a> *zoom_regions;
<a name="l00252"></a>00252   <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="l00253"></a>00253   CORBA_Environment ev;
<a name="l00254"></a>00254   <a class="code" href="structGNOME__Magnifier__RectBounds__type.html">GNOME_Magnifier_RectBounds</a> roi;
<a name="l00255"></a>00255   <span class="keywordtype">int</span> mouse_x_return, mouse_y_return;
<a name="l00256"></a>00256   <span class="keywordtype">int</span> w, h;
<a name="l00257"></a>00257   GdkModifierType mask_return;
<a name="l00258"></a>00258 
<a name="l00259"></a>00259   CORBA_exception_init (&amp;ev);
<a name="l00260"></a>00260 
<a name="l00261"></a>00261   <span class="keywordflow">if</span> (<a class="code" href="magnifier-main_8c.html#b4d2b03157ec9554d008ee134e28172c">global_options</a>.<a class="code" href="structMagnifierOptions.html#4adede66ab7d856234a35b97220e2988">mouse_follow</a> &amp;&amp; <a class="code" href="magnifier_8h.html#971fc276bc83e8071c4b450136ac5d5c">IS_MAGNIFIER</a> (magnifier))
<a name="l00262"></a>00262   {
<a name="l00263"></a>00263           gdk_window_get_pointer (