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-rw-r--r--ui/vnc-jobs.c16
-rw-r--r--ui/vnc.c2
2 files changed, 10 insertions, 8 deletions
diff --git a/ui/vnc-jobs.c b/ui/vnc-jobs.c
index 087b84d319..3c592b3f3d 100644
--- a/ui/vnc-jobs.c
+++ b/ui/vnc-jobs.c
@@ -33,21 +33,21 @@
 /*
  * Locking:
  *
- * There is three levels of locking:
+ * There are three levels of locking:
  * - jobs queue lock: for each operation on the queue (push, pop, isEmpty?)
  * - VncDisplay global lock: mainly used for framebuffer updates to avoid
  *                      screen corruption if the framebuffer is updated
- *			while the worker is doing something.
+ *                      while the worker is doing something.
  * - VncState::output lock: used to make sure the output buffer is not corrupted
- * 		   	 if two threads try to write on it at the same time
+ *                          if two threads try to write on it at the same time
  *
- * While the VNC worker thread is working, the VncDisplay global lock is hold
- * to avoid screen corruptions (this does not block vnc_refresh() because it
- * uses trylock()) but the output lock is not hold because the thread work on
+ * While the VNC worker thread is working, the VncDisplay global lock is held
+ * to avoid screen corruption (this does not block vnc_refresh() because it
+ * uses trylock()) but the output lock is not held because the thread works on
  * its own output buffer.
  * When the encoding job is done, the worker thread will hold the output lock
  * and copy its output buffer in vs->output.
-*/
+ */
 
 struct VncJobQueue {
     QemuCond cond;
@@ -62,7 +62,7 @@ typedef struct VncJobQueue VncJobQueue;
 
 /*
  * We use a single global queue, but most of the functions are
- * already reetrant, so we can easilly add more than one encoding thread
+ * already reentrant, so we can easily add more than one encoding thread
  */
 static VncJobQueue *queue;
 
diff --git a/ui/vnc.c b/ui/vnc.c
index 33e6386a6e..66ae93010f 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -1806,10 +1806,12 @@ static void set_encodings(VncState *vs, int32_t *encodings, size_t n_encodings)
             vs->features |= VNC_FEATURE_TIGHT_MASK;
             vs->vnc_encoding = enc;
             break;
+#ifdef CONFIG_VNC_PNG
         case VNC_ENCODING_TIGHT_PNG:
             vs->features |= VNC_FEATURE_TIGHT_PNG_MASK;
             vs->vnc_encoding = enc;
             break;
+#endif
         case VNC_ENCODING_ZLIB:
             vs->features |= VNC_FEATURE_ZLIB_MASK;
             vs->vnc_encoding = enc;