Extend the screenshot effect API.

Makes it possible to take a screenshot for a given window ID.

REVIEW: 104388

effects/screenshot/screenshot.cpp

@@ -176,6 +176,16 @@ void ScreenShotEffect::screenshotWindowUnderCursor(int mask)
     }
 }
 
+void ScreenShotEffect::screenshotForWindow(qulonglong winid, int mask)
+{
+    m_type = (ScreenShotType) mask;
+    EffectWindow* w = effects->findWindow(winid);
+    if(w && !w->isMinimized() && !w->isDeleted()) {
+        m_scheduledScreenshot = w;
+        m_scheduledScreenshot->addRepaintFull();
+    }
+}
+
 QString ScreenShotEffect::screenshotFullscreen()
 {
     return blitScreenshot(QRect(0, 0, displayWidth(), displayHeight()));

effects/screenshot/screenshot.h

@@ -45,6 +45,7 @@ public:
     static bool supported();
     static void convertFromGLImage(QImage &img, int w, int h);
 public Q_SLOTS:
+    Q_SCRIPTABLE void screenshotForWindow(qulonglong winid, int mask = 0);
     Q_SCRIPTABLE void screenshotWindowUnderCursor(int mask = 0);
     /**
      * Saves a screenshot of all screen into a file and returns the path to the file.