EmuWindow: Add support for specifying minimal client area sizes.

src/citra/emu_window/emu_window_glfw.cpp

@@ -46,6 +46,15 @@ void EmuWindow_GLFW::OnClientAreaResizeEvent(GLFWwindow* win, int width, int hei
     _dbg_assert_(GUI, width > 0);
     _dbg_assert_(GUI, height > 0);
 
+    // TODO: It's actually more interesting to us what the framebuffer size ends up being.
+    int adjusted_width = std::max<unsigned>(width, GetEmuWindow(win)->GetActiveConfig().min_client_area_size.first);
+    int adjusted_height = std::max<unsigned>(height, GetEmuWindow(win)->GetActiveConfig().min_client_area_size.second);
+
+    if (adjusted_width != width || adjusted_height != height) {
+        glfwSetWindowSize(win, adjusted_width, adjusted_height);
+        return;
+    }
+
     GetEmuWindow(win)->NotifyClientAreaSizeChanged(std::pair<unsigned,unsigned>(width, height));
 }
 
@@ -136,3 +145,15 @@ void EmuWindow_GLFW::ReloadSetKeymaps() {
     KeyMap::SetKeyMapping({Settings::values.pad_sup_key,    keyboard_id}, HID_User::PAD_CIRCLE_UP);
     KeyMap::SetKeyMapping({Settings::values.pad_sdown_key,  keyboard_id}, HID_User::PAD_CIRCLE_DOWN);
 }
+
+void EmuWindow_GLFW::OnMinimalClientAreaChangeRequest(const std::pair<unsigned,unsigned>& minimal_size) {
+    std::pair<int,int> current_size;
+    glfwGetWindowSize(m_render_window, &current_size.first, &current_size.second);
+
+    _dbg_assert_(GUI, (int)minimal_size.first > 0 && (int)minimal_size.second > 0);
+    int new_width  = std::max(current_size.first,  (int)minimal_size.first);
+    int new_height = std::max(current_size.second, (int)minimal_size.second);
+
+    if (current_size != std::make_pair(new_width, new_height))
+        glfwSetWindowSize(m_render_window, new_width, new_height);
+}

src/citra/emu_window/emu_window_glfw.h

@@ -37,6 +37,8 @@ public:
     void ReloadSetKeymaps() override;
 
 private:
+    void OnMinimalClientAreaChangeRequest(const std::pair<unsigned,unsigned>& minimal_size) override;
+
     static EmuWindow_GLFW* GetEmuWindow(GLFWwindow* win);
 
     GLFWwindow* m_render_window; ///< Internal GLFW render window

src/citra_qt/bootmanager.cpp

@@ -129,6 +129,9 @@ GRenderWindow::GRenderWindow(QWidget* parent) : QWidget(parent), emu_thread(this
     setLayout(layout);
     connect(&emu_thread, SIGNAL(started()), this, SLOT(moveContext()));
 
+	setMinimumSize(GetActiveConfig().min_client_area_size.first,
+                   GetActiveConfig().min_client_area_size.second);
+
     OnFramebufferSizeChanged();
     NotifyClientAreaSizeChanged(std::pair<unsigned,unsigned>(child->width(), child->height()));
 
@@ -275,3 +278,7 @@ void GRenderWindow::OnClientAreaResized(unsigned width, unsigned height)
 {
     NotifyClientAreaSizeChanged(std::make_pair(width, height));
 }
+
+void GRenderWindow::OnMinimalClientAreaChangeRequest(const std::pair<unsigned,unsigned>& minimal_size) {
+	setMinimumSize(minimal_size.first, minimal_size.second);
+}

src/citra_qt/bootmanager.hxx

@@ -121,6 +121,8 @@ public slots:
     void moveContext();  // overridden
 
 private:
+    void OnMinimalClientAreaChangeRequest(const std::pair<unsigned,unsigned>& minimal_size) override;
+
     QGLWidget* child;
 
     EmuThread emu_thread;

src/common/emu_window.h

@@ -20,6 +20,7 @@ public:
         bool    fullscreen;
         int     res_width;
         int     res_height;
+        std::pair<unsigned,unsigned> min_client_area_size;
     };
 
     /// Swap buffers to display the next frame
@@ -42,8 +43,8 @@ public:
     /// Signals a key release action to the HID module
     static void KeyReleased(KeyMap::HostDeviceKey key);
 
-    WindowConfig GetConfig() const {
+    const WindowConfig& GetActiveConfig() const {
-        return config;
+        return active_config;
     }
 
     void SetConfig(const WindowConfig& val) {
@@ -72,24 +73,40 @@ public:
         window_title = val;
     }
 
+    // Only call this from the GUI thread!
+    void ProcessConfigurationChanges() {
+        // TODO: For proper thread safety, we should eventually implement a proper
+        // multiple-writer/single-reader queue...
+
+        if (config.min_client_area_size != active_config.min_client_area_size) {
+            OnMinimalClientAreaChangeRequest(config.min_client_area_size);
+            config.min_client_area_size = active_config.min_client_area_size;
+        }
+    }
+
 protected:
-    EmuWindow() : // TODO: What the hell... -.- - don't hardcode dimensions here without applying them in a sensible manner...
+    EmuWindow() :
         window_title(Common::StringFromFormat("Citra | %s-%s", Common::g_scm_branch, Common::g_scm_desc))
-        m_client_area_width(640),
+    {
-        m_client_area_height(480),
+        // TODO
-    {}
+        config.min_client_area_size = std::make_pair(300u, 500u);
+        active_config = config;
+    }
     virtual ~EmuWindow() {}
 
     std::pair<unsigned,unsigned> NotifyFramebufferSizeChanged(const std::pair<unsigned,unsigned>& size) {
         framebuffer_size = size;
     }
 
-    void NotifyClientAreaSizeChanged(std::pair<unsigned,unsigned> size) {
+    void NotifyClientAreaSizeChanged(const std::pair<unsigned,unsigned>& size) {
         client_area_width = size.first;
         client_area_height = size.second;
     }
 
 private:
+    virtual void OnMinimalClientAreaChangeRequest(const std::pair<unsigned,unsigned>& minimal_size) {
+    }
+
     std::string window_title;      ///< Current window title, should be used by window impl.
 
     std::pair<unsigned,unsigned> framebuffer_size;
@@ -97,5 +114,6 @@ private:
     unsigned client_area_width;    ///< Current client width, should be set by window impl.
     unsigned client_area_height;   ///< Current client height, should be set by window impl.
 
-    WindowConfig config;         ///< Internal configuration
+    WindowConfig config;         ///< Internal configuration (changes pending for being applied in ProcessConfigurationChanges)
+    WindowConfig active_config;  ///< Internal active configuration
 };