randr: Add RRHasScanoutPixmap helper function

This is a preparation patch for adding prime hw-cursor support.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

2 files changed, 25 insertions, 0 deletions

diff --git a/randr/randrstr.h b/randr/randrstr.h
index 1baa91226..706e9a7b0 100644
--- a/randr/randrstr.h
+++ b/randr/randrstr.h
@@ -726,6 +726,12 @@ extern _X_EXPORT Bool
  RRReplaceScanoutPixmap(DrawablePtr pDrawable, PixmapPtr pPixmap, Bool enable);
 
 /*
+ * Return if the screen has any scanout_pixmap's attached
+ */
+extern _X_EXPORT Bool
+ RRHasScanoutPixmap(ScreenPtr pScreen);
+
+/*
  * Crtc dispatch
  */
 
diff --git a/randr/rrcrtc.c b/randr/rrcrtc.c
index 8fb2bca8a..76365919a 100644
--- a/randr/rrcrtc.c
+++ b/randr/rrcrtc.c
@@ -1945,3 +1945,22 @@ RRReplaceScanoutPixmap(DrawablePtr pDrawable, PixmapPtr pPixmap, Bool enable)
 
     return ret;
 }
+
+Bool
+RRHasScanoutPixmap(ScreenPtr pScreen)
+{
+    rrScrPriv(pScreen);
+    int i;
+
+    if (!pScreen->is_output_slave)
+        return FALSE;
+
+    for (i = 0; i < pScrPriv->numCrtcs; i++) {
+        RRCrtcPtr crtc = pScrPriv->crtcs[i];
+
+        if (crtc->scanout_pixmap)
+            return TRUE;
+    }
+    
+    return FALSE;
+}