Implement quick&dirty approach to update window size and position

external/android-emugl/host/libs/libOpenglRender/FrameBuffer.cpp

@@ -497,6 +497,13 @@ FrameBufferWindow* FrameBuffer::createWindow(int x, int y, int width, int height
     return window;
 }
 
+void FrameBuffer::updateWindow(FrameBufferWindow *window, int x, int y, int width, int height) {
+    if (!window)
+        return;
+
+    updateSubWindow(window->native_window, x, y, width, height);
+}
+
 void FrameBuffer::destroyWindow(FrameBufferWindow *window) {
     if (!window)
         return;

external/android-emugl/host/libs/libOpenglRender/FrameBuffer.h

@@ -79,6 +79,7 @@ public:
     static bool initialize(EGLNativeDisplayType nativeDisplay);
 
     FrameBufferWindow* createWindow(int x, int y, int width, int height);
+    void updateWindow(FrameBufferWindow *window, int x, int y, int width, int height);
     void destroyWindow(FrameBufferWindow *window);
 
     // Finalize the instance.

external/android-emugl/host/libs/libOpenglRender/LayerManager.cpp

@@ -82,13 +82,16 @@ void LayerManager::post_layer(const LayerInfo &layer) {
             l.second.updated = true;
         }
     }
-    else {
-        printf("New layer '%s' {%d,%d,%d,%d}\n", layer.name.c_str());
-        window = FrameBuffer::getFB()->createWindow(
-                    layer.display_frame.left,
-                    layer.display_frame.top,
-                    layer.display_frame.right,
-                    layer.display_frame.bottom);
+
+    auto width = layer.display_frame.right - layer.display_frame.left;
+    auto height = layer.display_frame.bottom - layer.display_frame.top;
+
+    if (!window) {
+        auto buffer = FrameBuffer::getFB()->getColorBufferFromHandle(layer.buffer_handle);
+
+        window = FrameBuffer::getFB()->createWindow(layer.display_frame.left,
+                                                    layer.display_frame.top,
+                                                    width, height);
         if (!window) {
             printf("Failed to create window for layer '%s'\n", layer.name.c_str());
             return;
@@ -97,7 +100,10 @@ void LayerManager::post_layer(const LayerInfo &layer) {
     }
 
     printf("%s: window %p buffer %d\n", __func__, window, layer.buffer_handle);
-
+    FrameBuffer::getFB()->updateWindow(window,
+                                       layer.display_frame.left,
+                                       layer.display_frame.top,
+                                       width, height);
     FrameBuffer::getFB()->post(window, layer.buffer_handle);
 }
 

external/android-emugl/host/libs/libOpenglRender/NativeSubWindow.h

@@ -30,6 +30,7 @@ class SubWindowHandler {
 public:
     virtual ~SubWindowHandler() { }
     virtual EGLNativeWindowType create_window(int x, int y, int width, int height) = 0;
+    virtual void update_window(EGLNativeWindowType win, int x, int y, int width, int height) = 0;
     virtual void destroy_window(EGLNativeWindowType win) = 0;
 };
 
@@ -55,6 +56,8 @@ EGLNativeWindowType createSubWindow(FBNativeWindowType p_window,
                                     int width,
                                     int height);
 
+void updateSubWindow(EGLNativeWindowType win, int x, int y, int width, int height);
+
 // Destroy a sub-window previously created through createSubWindow() above.
 void destroySubWindow(EGLNativeWindowType win);
 

external/android-emugl/host/libs/libOpenglRender/NativeSubWindow_delegate.cpp

@@ -44,6 +44,13 @@ EGLNativeWindowType createSubWindow(FBNativeWindowType p_window,
     return current_handler->create_window(x, y, width, height);
 }
 
+void updateSubWindow(EGLNativeWindowType win, int x, int y, int width, int height) {
+    if (!current_handler)
+        return;
+
+    return current_handler->update_window(win, x, y, width, height);
+}
+
 void destroySubWindow(EGLNativeWindowType win) {
     if (!current_handler)
         return;

src/anbox/ubuntu/window.cpp

@@ -62,6 +62,14 @@ Window::~Window() {
         SDL_DestroyWindow(window_);
 }
 
+void Window::resize(int width, int height) {
+    SDL_SetWindowSize(window_, width, height);
+}
+
+int Window::update_position(int x, int y) {
+    SDL_SetWindowPosition(window_, x, y);
+}
+
 EGLNativeWindowType Window::native_window() const {
     return native_window_;
 }

src/anbox/ubuntu/window.h

@@ -32,6 +32,9 @@ public:
     Window(int x, int y, int width, int height);
     ~Window();
 
+    void resize(int width, int height);
+    int update_position(int x, int y);
+
     EGLNativeWindowType native_window() const;
 
 private:

src/anbox/ubuntu/window_creator.cpp

@@ -91,6 +91,15 @@ catch (std::exception &err) {
     return 0;
 }
 
+void WindowCreator::update_window(EGLNativeWindowType win, int x, int y, int width, int height) {
+    auto iter = windows_.find(win);
+    if (iter == windows_.end())
+        return;
+
+    iter->second->resize(width, height);
+    iter->second->update_position(x, y);
+}
+
 void WindowCreator::destroy_window(EGLNativeWindowType win) {
     auto iter = windows_.find(win);
     if (iter == windows_.end())

src/anbox/ubuntu/window_creator.h

@@ -39,6 +39,7 @@ public:
     ~WindowCreator();
 
     EGLNativeWindowType create_window(int x, int y, int width, int height) override;
+    void update_window(EGLNativeWindowType win, int x, int y, int width, int height) override;
     void destroy_window(EGLNativeWindowType win) override;
 
     DisplayInfo display_info() const override;