added native_window_set_buffer_count()

this method can be used to change the number of buffers
associated to a native window. the default is two.

Change-Id: I608b959e6b29d77f95edb23c31dc9b099a758f2f

2 files changed, 11 insertions, 1 deletions

diff --git a/libs/surfaceflinger_client/SharedBufferStack.cpp b/libs/surfaceflinger_client/SharedBufferStack.cpp
index 5deeabb..e2e1591 100644
--- a/libs/surfaceflinger_client/SharedBufferStack.cpp
+++ b/libs/surfaceflinger_client/SharedBufferStack.cpp
@@ -463,6 +463,9 @@ status_t SharedBufferClient::setBufferCount(
     if (uint32_t(bufferCount) >= SharedBufferStack::NUM_BUFFER_MAX)
         return BAD_VALUE;
 
+    if (uint32_t(bufferCount) < SharedBufferStack::NUM_BUFFER_MIN)
+        return BAD_VALUE;
+
     RWLock::AutoWLock _wr(mLock);
 
     status_t err = ipc(bufferCount);
diff --git a/libs/surfaceflinger_client/Surface.cpp b/libs/surfaceflinger_client/Surface.cpp
index 4d5c0b6..5f42af0 100644
--- a/libs/surfaceflinger_client/Surface.cpp
+++ b/libs/surfaceflinger_client/Surface.cpp
@@ -584,6 +584,9 @@ int Surface::perform(int operation, va_list args)
     case NATIVE_WINDOW_SET_CROP:
         res = dispatch_crop( args );
         break;
+    case NATIVE_WINDOW_SET_BUFFER_COUNT:
+        res = dispatch_set_buffer_count( args );
+        break;
     default:
         res = NAME_NOT_FOUND;
         break;
@@ -607,6 +610,10 @@ int Surface::dispatch_crop(va_list args) {
     android_native_rect_t const* rect = va_arg(args, android_native_rect_t*);
     return crop( reinterpret_cast<Rect const*>(rect) );
 }
+int Surface::dispatch_set_buffer_count(va_list args) {
+    size_t bufferCount = va_arg(args, size_t);
+    return setBufferCount(bufferCount);
+}
 
 
 void Surface::setUsage(uint32_t reqUsage)
@@ -856,7 +863,7 @@ status_t Surface::getBufferLocked(int index, int usage)
                 currentBuffer->setIndex(index);
             }
         } else {
-            err = err<0 ? err : NO_MEMORY;
+            err = err<0 ? err : status_t(NO_MEMORY);
         }
     }
     return err;