renderer: adapt to daemon API

Daemon exposes a new API to fix the concurrent access problem.
Renderer class API has changed, this patch synchronizes on it.

Issue: #81542
Change-Id: I11a89a1e6c4cd4fbc185f7eb8ebc909f2c9fe544

src/CurrentCallVC.mm

@@ -356,13 +356,16 @@
 
 -(void) renderer: (Video::Renderer*)renderer renderFrameForView:(NSView*) view
 {
-    auto data = renderer->currentFrame();
     QSize res = renderer->size();
 
-    auto buf = reinterpret_cast<const unsigned char*>(data.data());
+    auto frame_ptr = renderer->currentFrame();
+    auto frame_data = frame_ptr.ptr;
+    if (!frame_data)
+        return;
+
 
     CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
-    CGContextRef newContext = CGBitmapContextCreate((void *)buf,
+    CGContextRef newContext = CGBitmapContextCreate(frame_data,
                                                     res.width(),
                                                     res.height(),
                                                     8,

src/VideoPrefsVC.mm

@@ -165,13 +165,15 @@ QMetaObject::Connection previewStopped;
 
 -(void) renderer: (Video::Renderer*)renderer renderFrameForView:(NSView*) view
 {
-    auto data = renderer->currentFrame();
     QSize res = renderer->size();
 
-    auto buf = reinterpret_cast<const unsigned char*>(data.data());
+    auto frame_ptr = renderer->currentFrame();
+    auto frame_data = frame_ptr.ptr;
+    if (!frame_data)
+        return;
 
     CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
-    CGContextRef newContext = CGBitmapContextCreate((void *)buf,
+    CGContextRef newContext = CGBitmapContextCreate(frame_data,
                                                     res.width(),
                                                     res.height(),
                                                     8,