zoom-region_8c-source.html

在Linux下实现magnification功能

<a name="l00498"></a>00498                 <span class="keywordflow">while</span> (i &lt; lookahead_n &amp;&amp; q &amp;&amp; q-&gt;next)
<a name="l00499"></a>00499                 {
<a name="l00500"></a>00500                         <span class="keywordflow">if</span> (_refactor_rects (a, q-&gt;next-&gt;data))
<a name="l00501"></a>00501                                 <span class="keywordflow">break</span>;
<a name="l00502"></a>00502                         <span class="keywordflow">else</span>
<a name="l00503"></a>00503                                 ++i;
<a name="l00504"></a>00504                 }
<a name="l00505"></a>00505                 q = _combine_update_rects (q, lookahead_n);
<a name="l00506"></a>00506         } <span class="keywordflow">while</span> (g_list_length (q) &lt; len);
<a name="l00507"></a>00507         fprintf (stderr, <span class="stringliteral">"ending queue length = %d\n"</span>, g_list_length (q));
<a name="l00508"></a>00508         <span class="keywordflow">return</span> q;
<a name="l00509"></a>00509 }
<a name="l00510"></a>00510 <span class="preprocessor">#endif</span>
<a name="l00511"></a>00511 <span class="preprocessor"></span>
<a name="l00515"></a>00515 <span class="keyword">static</span> GdkRectangle
<a name="l00516"></a><a class="code" href="zoom-region_8c.html#3a23496d257ccbde42bb437df7ad0b1d">00516</a> <a class="code" href="zoom-region_8c.html#3a23496d257ccbde42bb437df7ad0b1d">_rectangle_clip_to_rectangle</a> (GdkRectangle area,
<a name="l00517"></a>00517                               GdkRectangle clip_rect)
<a name="l00518"></a>00518 {
<a name="l00519"></a>00519         GdkRectangle clipped;
<a name="l00520"></a>00520         clipped.x = MAX (area.x, clip_rect.x);
<a name="l00521"></a>00521         clipped.y = MAX (area.y, clip_rect.y);
<a name="l00522"></a>00522         clipped.width = MIN ((area.x + area.width), (clip_rect.x + clip_rect.width)) - clipped.x;
<a name="l00523"></a>00523         clipped.height = MIN ((area.y + area.height), (clip_rect.y + clip_rect.height)) - clipped.y;
<a name="l00524"></a>00524         <span class="keywordflow">return</span> clipped;
<a name="l00525"></a>00525 }
<a name="l00526"></a>00526 
<a name="l00527"></a>00527 <span class="keyword">static</span> GdkRectangle
<a name="l00528"></a><a class="code" href="zoom-region_8c.html#a0177af10e6a26243f588cd782b5c0ed">00528</a> <a class="code" href="zoom-region_8c.html#a0177af10e6a26243f588cd782b5c0ed">_rectangle_clip_to_bounds</a> (GdkRectangle area,
<a name="l00529"></a>00529                            <a class="code" href="structGNOME__Magnifier__RectBounds__type.html">GNOME_Magnifier_RectBounds</a> *clip_bounds)
<a name="l00530"></a>00530 {
<a name="l00531"></a>00531         area.x = MAX (area.x, clip_bounds-&gt;<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#da72b580c4e14d8f1dcd85b2da3a8759">x1</a>);
<a name="l00532"></a>00532         area.x = MIN (area.x, clip_bounds-&gt;<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#721fd6fb9a4c3c6c3813402b31de633a">x2</a>);
<a name="l00533"></a>00533         area.width = MIN (area.width, clip_bounds-&gt;<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#721fd6fb9a4c3c6c3813402b31de633a">x2</a> - area.x);
<a name="l00534"></a>00534         area.y = MAX (area.y, clip_bounds-&gt;<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#24de0d98768b0b42dc53ab51950760c0">y1</a>);
<a name="l00535"></a>00535         area.y = MIN (area.y, clip_bounds-&gt;<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#3ba20b4c1f0db87a1b9f21169e20b5f3">y2</a>);
<a name="l00536"></a>00536         area.height = MIN (area.height, clip_bounds-&gt;<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#3ba20b4c1f0db87a1b9f21169e20b5f3">y2</a> - area.y);
<a name="l00537"></a>00537         <span class="keywordflow">return</span> area;
<a name="l00538"></a>00538 }
<a name="l00539"></a>00539 
<a name="l00540"></a>00540 <span class="keyword">static</span> GdkRectangle
<a name="l00541"></a><a class="code" href="zoom-region_8c.html#51861fe19d9a67df3c9d22c83f527510">00541</a> <a class="code" href="zoom-region_8c.html#51861fe19d9a67df3c9d22c83f527510">zoom_region_clip_to_source</a> (<a class="code" href="structZoomRegion.html">ZoomRegion</a> *<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>,
<a name="l00542"></a>00542                             GdkRectangle area)
<a name="l00543"></a>00543 {
<a name="l00544"></a>00544     <a class="code" href="structGNOME__Magnifier__RectBounds__type.html">GNOME_Magnifier_RectBounds</a> *source_rect_ptr;
<a name="l00545"></a>00545     <span class="keywordflow">if</span> (<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a> &amp;&amp; <a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv &amp;&amp; <a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv-&gt;parent)
<a name="l00546"></a>00546     {
<a name="l00547"></a>00547         source_rect_ptr = &amp;((<a class="code" href="structMagnifier.html">Magnifier</a> *)<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv-&gt;parent)-&gt;source_bounds;
<a name="l00548"></a>00548         <a class="code" href="zoom-region_8c.html#fd75412a9e5fbefb4852b72f4725f53a">DEBUG_RECT</a> (<span class="stringliteral">"clipping to source bounds"</span>, <a class="code" href="zoom-region_8c.html#0b0fe1c491e287892ad71b46031ef8c6">zoom_region_rect_from_bounds</a> (<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>, source_rect_ptr)); 
<a name="l00549"></a>00549         <span class="keywordflow">return</span> <a class="code" href="zoom-region_8c.html#a0177af10e6a26243f588cd782b5c0ed">_rectangle_clip_to_bounds</a> (area, source_rect_ptr);
<a name="l00550"></a>00550     }
<a name="l00551"></a>00551     <span class="keywordflow">return</span> area;
<a name="l00552"></a>00552 }
<a name="l00553"></a>00553 
<a name="l00554"></a>00554 <span class="keyword">static</span> GdkRectangle
<a name="l00555"></a><a class="code" href="zoom-region_8c.html#396b27005c8b715361e2b9d22f354d0b">00555</a> <a class="code" href="zoom-region_8c.html#396b27005c8b715361e2b9d22f354d0b">zoom_region_clip_to_exposed_target</a> (<a class="code" href="structZoomRegion.html">ZoomRegion</a> *<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>,
<a name="l00556"></a>00556                                     GdkRectangle area)
<a name="l00557"></a>00557 {
<a name="l00558"></a>00558         <a class="code" href="structGNOME__Magnifier__RectBounds__type.html">GNOME_Magnifier_RectBounds</a> onscreen_target, *source_area;
<a name="l00559"></a>00559         source_area = &amp;<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv-&gt;source_area;
<a name="l00560"></a>00560 
<a name="l00561"></a>00561         onscreen_target.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#da72b580c4e14d8f1dcd85b2da3a8759">x1</a> = MAX (floor (<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv-&gt;exposed_bounds.x1
<a name="l00562"></a>00562                                          / <a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;xscale),
<a name="l00563"></a>00563                                          source_area-&gt;<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#da72b580c4e14d8f1dcd85b2da3a8759">x1</a>);
<a name="l00564"></a>00564         onscreen_target.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#24de0d98768b0b42dc53ab51950760c0">y1</a> = MAX (floor (<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv-&gt;exposed_bounds.y1
<a name="l00565"></a>00565                                          / <a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;yscale),
<a name="l00566"></a>00566                                          source_area-&gt;<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#24de0d98768b0b42dc53ab51950760c0">y1</a>);
<a name="l00567"></a>00567         onscreen_target.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#721fd6fb9a4c3c6c3813402b31de633a">x2</a> = MIN (ceil (<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv-&gt;exposed_bounds.x2
<a name="l00568"></a>00568                                         / <a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;xscale),
<a name="l00569"></a>00569                                         source_area-&gt;<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#721fd6fb9a4c3c6c3813402b31de633a">x2</a>);
<a name="l00570"></a>00570         onscreen_target.<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#3ba20b4c1f0db87a1b9f21169e20b5f3">y2</a> = MIN (ceil (<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv-&gt;exposed_bounds.y2
<a name="l00571"></a>00571                                         / <a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;yscale),
<a name="l00572"></a>00572                                         source_area-&gt;<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#3ba20b4c1f0db87a1b9f21169e20b5f3">y2</a>);
<a name="l00573"></a>00573 
<a name="l00574"></a>00574         <span class="keywordflow">return</span> <a class="code" href="zoom-region_8c.html#a0177af10e6a26243f588cd782b5c0ed">_rectangle_clip_to_bounds</a> (area, &amp;onscreen_target);
<a name="l00575"></a>00575 }
<a name="l00576"></a>00576 
<a name="l00577"></a>00577 <span class="keyword">static</span> GdkRectangle
<a name="l00578"></a><a class="code" href="zoom-region_8c.html#e6d58050549df40c5722ad75976dbcbd">00578</a> <a class="code" href="zoom-region_8c.html#e6d58050549df40c5722ad75976dbcbd">zoom_region_clip_to_scaled_pixmap</a> (<a class="code" href="structZoomRegion.html">ZoomRegion</a> *<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>,
<a name="l00579"></a>00579                                    GdkRectangle area)
<a name="l00580"></a>00580 {
<a name="l00581"></a>00581         GdkRectangle pixmap_area = {0, 0, 0, 0};
<a name="l00582"></a>00582         <span class="keywordflow">if</span> (<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv &amp;&amp; <a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv-&gt;pixmap)
<a name="l00583"></a>00583         {
<a name="l00584"></a>00584             gdk_drawable_get_size (<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv-&gt;pixmap, &amp;pixmap_area.width, &amp;pixmap_area.height);
<a name="l00585"></a>00585             <span class="keywordflow">return</span> <a class="code" href="zoom-region_8c.html#3a23496d257ccbde42bb437df7ad0b1d">_rectangle_clip_to_rectangle</a> (area, pixmap_area);
<a name="l00586"></a>00586         }
<a name="l00587"></a>00587         <span class="keywordflow">else</span>
<a name="l00588"></a>00588             <span class="keywordflow">return</span> area;
<a name="l00589"></a>00589 }
<a name="l00590"></a>00590 
<a name="l00591"></a>00591 <span class="keyword">static</span> GdkRectangle
<a name="l00592"></a><a class="code" href="zoom-region_8c.html#82f6274b8c4c1b030f48c916e20529e9">00592</a> <a class="code" href="zoom-region_8c.html#82f6274b8c4c1b030f48c916e20529e9">zoom_region_clip_to_window</a> (<a class="code" href="structZoomRegion.html">ZoomRegion</a> *<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>,
<a name="l00593"></a>00593                             GdkRectangle area)
<a name="l00594"></a>00594 {
<a name="l00595"></a>00595         GdkRectangle window_rect;
<a name="l00596"></a>00596 
<a name="l00597"></a>00597         <span class="comment">/* we can just return ATM because _rectangle_clip_to_rectangle is unimplemented now */</span>
<a name="l00598"></a>00598 
<a name="l00599"></a>00599         <span class="keywordflow">return</span> area;
<a name="l00600"></a>00600 
<a name="l00601"></a>00601         <span class="keywordflow">if</span> (<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv-&gt;w-&gt;window)
<a name="l00602"></a>00602                 gdk_drawable_get_size (GDK_DRAWABLE (<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv-&gt;w-&gt;window),
<a name="l00603"></a>00603                                        &amp;window_rect.x,
<a name="l00604"></a>00604                                        &amp;window_rect.y);
<a name="l00605"></a>00605         <span class="keywordflow">else</span> 
<a name="l00606"></a>00606         {
<a name="l00607"></a>00607                 window_rect.x = 0;
<a name="l00608"></a>00608                 window_rect.y = 0;
<a name="l00609"></a>00609         }
<a name="l00610"></a>00610         <span class="keywordflow">return</span> <a class="code" href="zoom-region_8c.html#3a23496d257ccbde42bb437df7ad0b1d">_rectangle_clip_to_rectangle</a> (area, window_rect);
<a name="l00611"></a>00611 }
<a name="l00612"></a>00612 
<a name="l00613"></a>00613 <span class="keyword">static</span> <span class="keyword">const</span> GdkRectangle
<a name="l00614"></a><a class="code" href="zoom-region_8c.html#78f8bae0f31e2a89b89251c8b580ea8f">00614</a> <a class="code" href="zoom-region_8c.html#78f8bae0f31e2a89b89251c8b580ea8f">zoom_region_source_rect_from_view_bounds</a> (<a class="code" href="structZoomRegion.html">ZoomRegion</a> *<a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>,
<a name="l00615"></a>00615                                           <span class="keyword">const</span> <a class="code" href="structGNOME__Magnifier__RectBounds__type.html">GNOME_Magnifier_RectBounds</a> *view_bounds)
<a name="l00616"></a>00616 {
<a name="l00617"></a>00617         GdkRectangle source_rect;
<a name="l00618"></a>00618         source_rect.x = floor ((view_bounds-&gt;<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#da72b580c4e14d8f1dcd85b2da3a8759">x1</a> + <a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv-&gt;exposed_bounds.x1)
<a name="l00619"></a>00619                                / <a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;xscale);
<a name="l00620"></a>00620         source_rect.y = floor ((view_bounds-&gt;<a class="code" href="structGNOME__Magnifier__RectBounds__type.html#24de0d98768b0b42dc53ab51950760c0">y1</a> + <a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;priv-&gt;exposed_bounds.y1)
<a name="l00621"></a>00621                                 / <a class="code" href="magnifier-main_8c.html#7155900ae5785c02d682d6ebdfdfa432">zoom_region</a>-&gt;yscale);
<a name="