commit fe0a87b54654a1392650e7f1862df473287d8332
author Jamie Gennis <jgennis@google.com> Wed Jul 13 19:12:20 2011 -0700
committer Jamie Gennis <jgennis@google.com> Thu Jul 14 17:48:32 2011 -0700
tree 9252bcd0433601139bc67f64d88e20d38bfdd9a9
parent 3e646d62e5b99bf479c775e88fa8324229a0670f

SurfaceTexture: make (dis)connect into an IPC

This change makes the ANativeWindow connect and disconnect calls result
in an IPC to the SurfaceTexture object.  This will allow us to prevent
multiple simultaneous connections from different processes.

Change-Id: Id9aa1003b1335b96ca6bd4a1f5a67aa433d42efb

libs/gui/SurfaceTexture.cpp

diff --git a/libs/gui/SurfaceTexture.cpp b/libs/gui/SurfaceTexture.cpp
index 886a3fb..1410481 100644
--- a/libs/gui/SurfaceTexture.cpp
+++ b/libs/gui/SurfaceTexture.cpp
@@ -92,7 +92,8 @@
     mNextTransform(0),
     mTexName(tex),
     mSynchronousMode(false),
-    mAllowSynchronousMode(allowSynchronousMode) {
+    mAllowSynchronousMode(allowSynchronousMode),
+    mConnectedApi(NO_CONNECTED_API) {
     LOGV("SurfaceTexture::SurfaceTexture");
     sp<ISurfaceComposer> composer(ComposerService::getComposerService());
     mGraphicBufferAlloc = composer->createGraphicBufferAlloc();
@@ -493,6 +494,50 @@
     return OK;
 }
 
+status_t SurfaceTexture::connect(int api) {
+    LOGV("SurfaceTexture::connect");
+    Mutex::Autolock lock(mMutex);
+    int err = NO_ERROR;
+    switch (api) {
+        case NATIVE_WINDOW_API_EGL:
+        case NATIVE_WINDOW_API_CPU:
+        case NATIVE_WINDOW_API_MEDIA:
+        case NATIVE_WINDOW_API_CAMERA:
+            if (mConnectedApi != NO_CONNECTED_API) {
+                err = -EINVAL;
+            } else {
+                mConnectedApi = api;
+            }
+            break;
+        default:
+            err = -EINVAL;
+            break;
+    }
+    return err;
+}
+
+status_t SurfaceTexture::disconnect(int api) {
+    LOGV("SurfaceTexture::disconnect");
+    Mutex::Autolock lock(mMutex);
+    int err = NO_ERROR;
+    switch (api) {
+        case NATIVE_WINDOW_API_EGL:
+        case NATIVE_WINDOW_API_CPU:
+        case NATIVE_WINDOW_API_MEDIA:
+        case NATIVE_WINDOW_API_CAMERA:
+            if (mConnectedApi == api) {
+                mConnectedApi = NO_CONNECTED_API;
+            } else {
+                err = -EINVAL;
+            }
+            break;
+        default:
+            err = -EINVAL;
+            break;
+    }
+    return err;
+}
+
 status_t SurfaceTexture::updateTexImage() {
     LOGV("SurfaceTexture::updateTexImage");
     Mutex::Autolock lock(mMutex);