Fix for doing multiple Begin()/End() during the same frame

Tricky bug, I was calling abs() which resolve to abs(float) under
Windows with the include we have, but abs(int) under Mac/Linux

examples/directx9_example/main.cpp

@@ -99,55 +99,6 @@ static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_c
 	}
 }
 
-// Get text data in Win32 clipboard
-static const char* ImImpl_GetClipboardTextFn()
-{
-	static char* buf_local = NULL;
-	if (buf_local)
-	{
-		free(buf_local);
-		buf_local = NULL;
-	}
-
-	if (!OpenClipboard(NULL)) 
-		return NULL;
-
-	HANDLE buf_handle = GetClipboardData(CF_TEXT); 
-	if (buf_handle == NULL)
-		return NULL;
-
-	if (char* buf_global = (char*)GlobalLock(buf_handle))
-		buf_local = strdup(buf_global);
-	GlobalUnlock(buf_handle); 
-	CloseClipboard(); 
-
-	return buf_local;
-}
-
-// Set text data in Win32 clipboard
-static void ImImpl_SetClipboardTextFn(const char* text, const char* text_end)
-{
-	if (!OpenClipboard(NULL))
-		return;
-
-	if (!text_end)
-		text_end = text + strlen(text);
-
-	const int buf_length = (text_end - text) + 1;
-	HGLOBAL buf_handle = GlobalAlloc(GMEM_MOVEABLE, buf_length * sizeof(char)); 
-	if (buf_handle == NULL)
-		return;
-
-	char* buf_global = (char *)GlobalLock(buf_handle); 
-	memcpy(buf_global, text, text_end - text);
-	buf_global[text_end - text] = 0;
-	GlobalUnlock(buf_handle); 
-
-	EmptyClipboard();
-	SetClipboardData(CF_TEXT, buf_handle);
-	CloseClipboard();
-}
-
 HRESULT InitD3D(HWND hWnd)
 {
     if (NULL == (g_pD3D = Direct3DCreate9(D3D_SDK_VERSION)))
@@ -250,8 +201,6 @@ void InitImGui()
 	io.KeyMap[ImGuiKey_Z] = 'Z';
 
 	io.RenderDrawListsFn = ImImpl_RenderDrawLists;
-	io.SetClipboardTextFn = ImImpl_SetClipboardTextFn;
-	io.GetClipboardTextFn = ImImpl_GetClipboardTextFn;
 	
 	// Create the vertex buffer
 	if (g_pd3dDevice->CreateVertexBuffer(10000 * sizeof(CUSTOMVERTEX), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &g_pVB, NULL) < 0)
@@ -271,6 +220,35 @@ void InitImGui()
 	}
 }
 
+INT64 ticks_per_second = 0;
+INT64 time = 0;
+
+void UpdateImGui()
+{
+	ImGuiIO& io = ImGui::GetIO();
+
+	// Setup timestep
+	INT64 current_time;
+	QueryPerformanceCounter((LARGE_INTEGER *)&current_time); 
+	io.DeltaTime = (float)(current_time - time) / ticks_per_second;
+	time = current_time;
+
+	// Setup inputs
+	// (we already got mouse position, buttons, wheel from the window message callback)
+	BYTE keystate[256];
+	GetKeyboardState(keystate);
+	for (int i = 0; i < 256; i++)
+		io.KeysDown[i] = (keystate[i] & 0x80) != 0;
+	io.KeyCtrl = (keystate[VK_CONTROL] & 0x80) != 0;
+	io.KeyShift = (keystate[VK_SHIFT] & 0x80) != 0;
+	// io.MousePos : filled by WM_MOUSEMOVE event
+	// io.MouseDown : filled by WM_*BUTTON* events
+	// io.MouseWheel : filled by WM_MOUSEWHEEL events
+
+	// Start the frame
+	ImGui::NewFrame();
+}
+
 int WINAPI wWinMain(HINSTANCE hInst, HINSTANCE, LPWSTR, int)
 {
     // Register the window class
@@ -280,101 +258,91 @@ int WINAPI wWinMain(HINSTANCE hInst, HINSTANCE, LPWSTR, int)
     // Create the application's window
     hWnd = CreateWindow(L"ImGui Example", L"ImGui DirectX9 Example", WS_OVERLAPPEDWINDOW, 100, 100, 1280, 800, NULL, NULL, wc.hInstance, NULL);
 
-	INT64 ticks_per_second, time;
 	if (!QueryPerformanceFrequency((LARGE_INTEGER *)&ticks_per_second))
 		return 1;
 	if (!QueryPerformanceCounter((LARGE_INTEGER *)&time))
 		return 1;
 
 	// Initialize Direct3D
-    if (InitD3D(hWnd) >= 0)
+    if (InitD3D(hWnd) < 0)
+	{
+		if (g_pVB)
+			g_pVB->Release();
+	    UnregisterClass(L"ImGui Example", wc.hInstance);
+		return 1;
+	}
+
+	// Show the window
+	ShowWindow(hWnd, SW_SHOWDEFAULT);
+	UpdateWindow(hWnd);
+
+	InitImGui();
+
+    // Enter the message loop
+    MSG msg;
+    ZeroMemory(&msg, sizeof(msg));
+    while (msg.message != WM_QUIT)
     {
-        // Show the window
-        ShowWindow(hWnd, SW_SHOWDEFAULT);
-        UpdateWindow(hWnd);
-
-		InitImGui();
-
-        // Enter the message loop
-        MSG msg;
-        ZeroMemory(&msg, sizeof(msg));
-        while (msg.message != WM_QUIT)
+        if (PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
         {
-            if (PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
-            {
-                TranslateMessage(&msg);
-                DispatchMessage(&msg);
-				continue;
-            }
+            TranslateMessage(&msg);
+            DispatchMessage(&msg);
+			continue;
+        }
 		
-			// 1) ImGui start frame, setup time delta & inputs
-			ImGuiIO& io = ImGui::GetIO();
-			INT64 current_time;
-			QueryPerformanceCounter((LARGE_INTEGER *)&current_time); 
-			io.DeltaTime = (float)(current_time - time) / ticks_per_second;
-			time = current_time;
-			BYTE keystate[256];
-			GetKeyboardState(keystate);
-			for (int i = 0; i < 256; i++)
-				io.KeysDown[i] = (keystate[i] & 0x80) != 0;
-			io.KeyCtrl = (keystate[VK_CONTROL] & 0x80) != 0;
-			io.KeyShift = (keystate[VK_SHIFT] & 0x80) != 0;
-			// io.MousePos : filled by WM_MOUSEMOVE event
-			// io.MouseDown : filled by WM_*BUTTON* events
-			// io.MouseWheel : filled by WM_MOUSEWHEEL events
-			ImGui::NewFrame();
+		UpdateImGui();
 
-			// 2) ImGui usage
-			static bool show_test_window = true;
-			static bool show_another_window = false;
-			static float f;
-			ImGui::Text("Hello, world!");
-			ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
-			show_test_window ^= ImGui::Button("Test Window");
-			show_another_window ^= ImGui::Button("Another Window");
+		// Create a simple window
+		// Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug"
+		static bool show_test_window = true;
+		static bool show_another_window = false;
+		static float f;
+		ImGui::Text("Hello, world!");
+		ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
+		show_test_window ^= ImGui::Button("Test Window");
+		show_another_window ^= ImGui::Button("Another Window");
 
-			// Calculate and show framerate
-			static float ms_per_frame[120] = { 0 };
-			static int ms_per_frame_idx = 0;
-			static float ms_per_frame_accum = 0.0f;
-			ms_per_frame_accum -= ms_per_frame[ms_per_frame_idx];
-			ms_per_frame[ms_per_frame_idx] = io.DeltaTime * 1000.0f;
-			ms_per_frame_accum += ms_per_frame[ms_per_frame_idx];
-			ms_per_frame_idx = (ms_per_frame_idx + 1) % 120;
-			const float ms_per_frame_avg = ms_per_frame_accum / 120;
-			ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", ms_per_frame_avg, 1000.0f / ms_per_frame_avg);
+		// Calculate and show framerate
+		static float ms_per_frame[120] = { 0 };
+		static int ms_per_frame_idx = 0;
+		static float ms_per_frame_accum = 0.0f;
+		ms_per_frame_accum -= ms_per_frame[ms_per_frame_idx];
+		ms_per_frame[ms_per_frame_idx] = ImGui::GetIO().DeltaTime * 1000.0f;
+		ms_per_frame_accum += ms_per_frame[ms_per_frame_idx];
+		ms_per_frame_idx = (ms_per_frame_idx + 1) % 120;
+		const float ms_per_frame_avg = ms_per_frame_accum / 120;
+		ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", ms_per_frame_avg, 1000.0f / ms_per_frame_avg);
 
-			if (show_test_window)
-			{
-				// More example code in ShowTestWindow()
-				ImGui::SetNewWindowDefaultPos(ImVec2(650, 20));		// Normally user code doesn't need/want to call it because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
-				ImGui::ShowTestWindow(&show_test_window);
-			}
-
-			if (show_another_window)
-			{
-				ImGui::Begin("Another Window", &show_another_window, ImVec2(200,100));
-				ImGui::Text("Hello");
-				ImGui::End();
-			}
-
-			// 3) Rendering
-			// Clear frame buffer
-		    g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, false);
-			g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, false);
-			g_pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, false);
-			g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(204, 153, 153), 1.0f, 0);
-			if (g_pd3dDevice->BeginScene() >= 0)
-			{
-				// Render ImGui
-				ImGui::Render();
-				g_pd3dDevice->EndScene();
-			}
-		    g_pd3dDevice->Present(NULL, NULL, NULL, NULL);
+		// Show the ImGui test window
+		// Most of user example code is in ImGui::ShowTestWindow()
+		if (show_test_window)
+		{
+			ImGui::SetNewWindowDefaultPos(ImVec2(650, 20));		// Normally user code doesn't need/want to call it because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
+			ImGui::ShowTestWindow(&show_test_window);
 		}
 
-		ImGui::Shutdown();
-    }
+		// Show another simple window
+		if (show_another_window)
+		{
+			ImGui::Begin("Another Window", &show_another_window, ImVec2(200,100));
+			ImGui::Text("Hello");
+			ImGui::End();
+		}
+
+		// Rendering
+		g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, false);
+		g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, false);
+		g_pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, false);
+		g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(204, 153, 153), 1.0f, 0);
+		if (g_pd3dDevice->BeginScene() >= 0)
+		{
+			ImGui::Render();
+			g_pd3dDevice->EndScene();
+		}
+		g_pd3dDevice->Present(NULL, NULL, NULL, NULL);
+	}
+
+	ImGui::Shutdown();
 
 	if (g_pVB)
 		g_pVB->Release();

examples/opengl_example/Makefile.Macosx

@@ -5,7 +5,8 @@
 #
 
 CXXFLAGS=-framework OpenGL -framework Cocoa -framework IOKit 
-#CXXFLAGS+=-L/usr/local/Cellar/glew/1.10.0/lib -L/usr/local/Cellar/glfw3/3.0.4/lib
+CXXFLAGS+=-I/usr/local/Cellar/glew/1.10.0/include -I/usr/local/Cellar/glfw3/3.0.4/include
+CXXFLAGS+=-L/usr/local/Cellar/glew/1.10.0/lib -L/usr/local/Cellar/glfw3/3.0.4/lib
 CXXFLAGS+=-lglew -lglfw3
 CXXFLAGS+=-I../../
 CXXFLAGS+= -D__APPLE__

examples/opengl_example/main.cpp

@@ -19,7 +19,7 @@ static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_c
 	if (cmd_lists_count == 0)
 		return;
 
-	// Setup render state: alpha-blending enabled, no face culling, no depth testing
+	// Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, vertex/texcoord/color pointers.
 	glEnable(GL_BLEND);
 	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 	glDisable(GL_CULL_FACE);
@@ -29,11 +29,11 @@ static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_c
 	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 	glEnableClientState(GL_COLOR_ARRAY);
 
-	// Bind texture
+	// Setup texture
 	glBindTexture(GL_TEXTURE_2D, fontTex);
 	glEnable(GL_TEXTURE_2D);
 
-	// Setup matrices
+	// Setup orthographic projection matrix
 	const float width = ImGui::GetIO().DisplaySize.x;
 	const float height = ImGui::GetIO().DisplaySize.y;
 	glMatrixMode(GL_PROJECTION);
@@ -73,24 +73,33 @@ static void ImImpl_SetClipboardTextFn(const char* text, const char* text_end)
 	if (!text_end)
 		text_end = text + strlen(text);
 
-	// Add a zero-terminator because glfw function doesn't take a size
-	char* buf = (char*)malloc(text_end - text + 1);
-	memcpy(buf, text, text_end-text);
-	buf[text_end-text] = '\0';
-	glfwSetClipboardString(window, buf);
-	free(buf);
+	if (*text_end == 0)
+	{
+		// Already got a zero-terminator at 'text_end', we don't need to add one
+		glfwSetClipboardString(window, text);
+	}
+	else
+	{
+		// Add a zero-terminator because glfw function doesn't take a size
+		char* buf = (char*)malloc(text_end - text + 1);
+		memcpy(buf, text, text_end-text);
+		buf[text_end-text] = '\0';
+		glfwSetClipboardString(window, buf);
+		free(buf);
+	}
 }
 
+
 // GLFW callbacks to get events
 static void glfw_error_callback(int error, const char* description)
 {
 	fputs(description, stderr);
 }
 
-static float mouse_wheel = 0.0f;
 static void glfw_scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
 {
-	mouse_wheel = (float)yoffset;
+	ImGuiIO& io = ImGui::GetIO();
+	io.MouseWheel = (yoffset != 0.0f) ? yoffset > 0.0f ? 1 : - 1 : 0;			// Mouse wheel: -1,0,+1
 }
 
 static void glfw_key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
@@ -173,37 +182,43 @@ void InitImGui()
 	stbi_image_free(tex_data);
 }
 
-void Shutdown()
+void UpdateImGui()
 {
-	ImGui::Shutdown();
-	glfwTerminate();
+	ImGuiIO& io = ImGui::GetIO();
+
+	// Setup timestep
+	static double time = 0.0f;
+	const double current_time =  glfwGetTime();
+	io.DeltaTime = (float)(current_time - time);
+	time = current_time;
+
+	// Setup inputs
+	// (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents())
+	double mouse_x, mouse_y;
+	glfwGetCursorPos(window, &mouse_x, &mouse_y);
+	io.MousePos = ImVec2((float)mouse_x, (float)mouse_y);                           // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
+	io.MouseDown[0] = glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_LEFT) != 0;
+	io.MouseDown[1] = glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_RIGHT) != 0;
+
+	// Start the frame
+	ImGui::NewFrame();
 }
 
+// Application code
 int main(int argc, char** argv)
 {
 	InitGL();
 	InitImGui();
 
-	double time = glfwGetTime();
 	while (!glfwWindowShouldClose(window))
 	{
 		ImGuiIO& io = ImGui::GetIO();
+		io.MouseWheel = 0;
 		glfwPollEvents();
+		UpdateImGui();
 
-		// 1) ImGui start frame, setup time delta & inputs
-		const double current_time =  glfwGetTime();
-		io.DeltaTime = (float)(current_time - time);
-		time = current_time;
-		double mouse_x, mouse_y;
-		glfwGetCursorPos(window, &mouse_x, &mouse_y);
-		io.MousePos = ImVec2((float)mouse_x, (float)mouse_y);                            // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
-		io.MouseDown[0] = glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_LEFT) != 0;
-		io.MouseDown[1] = glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_RIGHT) != 0;
-		io.MouseWheel = (mouse_wheel != 0) ? mouse_wheel > 0.0f ? 1 : - 1 : 0;            // Mouse wheel: -1,0,+1
-		mouse_wheel = 0.0f;
-		ImGui::NewFrame();
-
-		// 2) ImGui usage
+		// Create a simple window
+		// Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug"
 		static bool show_test_window = true;
 		static bool show_another_window = false;
 		static float f;
@@ -217,19 +232,21 @@ int main(int argc, char** argv)
 		static int ms_per_frame_idx = 0;
 		static float ms_per_frame_accum = 0.0f;
 		ms_per_frame_accum -= ms_per_frame[ms_per_frame_idx];
-		ms_per_frame[ms_per_frame_idx] = io.DeltaTime * 1000.0f;
+		ms_per_frame[ms_per_frame_idx] = ImGui::GetIO().DeltaTime * 1000.0f;
 		ms_per_frame_accum += ms_per_frame[ms_per_frame_idx];
 		ms_per_frame_idx = (ms_per_frame_idx + 1) % 120;
 		const float ms_per_frame_avg = ms_per_frame_accum / 120;
 		ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", ms_per_frame_avg, 1000.0f / ms_per_frame_avg);
 
+		// Show the ImGui test window
+		// Most of user example code is in ImGui::ShowTestWindow()
 		if (show_test_window)
 		{
-			// More example code in ShowTestWindow()
 			ImGui::SetNewWindowDefaultPos(ImVec2(650, 20));        // Normally user code doesn't need/want to call it because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
 			ImGui::ShowTestWindow(&show_test_window);
 		}
 
+		// Show another simple window
 		if (show_another_window)
 		{
 			ImGui::Begin("Another Window", &show_another_window, ImVec2(200,100));
@@ -237,15 +254,15 @@ int main(int argc, char** argv)
 			ImGui::End();
 		}
 
-		// 3) Rendering
+		// Rendering
 		glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
 		glClearColor(0.8f, 0.6f, 0.6f, 1.0f);
 		glClear(GL_COLOR_BUFFER_BIT);
 		ImGui::Render();
-
 		glfwSwapBuffers(window);
 	}
 
-	Shutdown();
+	ImGui::Shutdown();
+	glfwTerminate();
 	return 0;
 }

imconfig.h

@@ -4,15 +4,22 @@
 
 #pragma once
 
-//----- Define your own ImVector<> type if you don't want to use the provided implementation defined in imgui.h
+//---- Define your own ImVector<> type if you don't want to use the provided implementation defined in imgui.h
 //#include <vector>
 //#define ImVector	std::vector
 //#define ImVector	MyVector
 
-//----- Define assertion handler. Default to calling assert().
-// #define IM_ASSERT(_EXPR)	MyAssert(_EXPR)
+//---- Define assertion handler. Defaults to calling assert().
+//#define IM_ASSERT(_EXPR)	MyAssert(_EXPR)
 
-//----- Define implicit cast operators to convert back<>forth from your math types and ImVec2/ImVec4.
+//---- Don't implement default clipboard handlers for Windows (so as not to link with OpenClipboard(), etc.)
+//#define IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCS
+
+//---- If you are loading a custom font, ImGui expect to find a pure white pixel at (0,0)
+// Change it's UV coordinate here if you can't have a white pixel at (0,0)
+//#define IMGUI_FONT_TEX_UV_FOR_WHITE	ImVec2(0.f/256.f,0.f/256.f)
+
+//---- Define implicit cast operators to convert back<>forth from your math types and ImVec2/ImVec4.
 /*
 #define IM_VEC2_CLASS_EXTRA													\
 		ImVec2(const MyVec2& f) { x = f.x; y = f.y; }						\
@@ -23,8 +30,8 @@
 		operator MyVec4() const { return MyVec4(x,y,z,w); }
 */
 
-//----- Freely implement extra functions within the ImGui:: namespace.
-//----- e.g. you can create variants of the ImGui::Value() helper for your low-level math types.
+//---- Freely implement extra functions within the ImGui:: namespace.
+//---- e.g. you can create variants of the ImGui::Value() helper for your low-level math types.
 /*
 namespace ImGui
 {

imgui.cpp

@@ -101,7 +101,7 @@
 
  - if you want to use a different font than the default
    - create bitmap font data using BMFont. allocate ImGui::GetIO().Font and use ->LoadFromFile()/LoadFromMemory(), set ImGui::GetIO().FontHeight
-   - load your texture yourself. texture *MUST* have white pixel at UV coordinate 'IMDRAW_TEX_UV_FOR_WHITE' (you can #define it in imconfig.h), this is used by solid objects.
+   - load your texture yourself. texture *MUST* have white pixel at UV coordinate 'IMGUI_FONT_TEX_UV_FOR_WHITE' (you can #define it in imconfig.h), this is used by solid objects.
 
  - tip: the construct 'if (IMGUI_ONCE_UPON_A_FRAME)' will evaluate to true only once a frame, you can use it to add custom UI in the middle of a deep nested inner loop in your code.
  - tip: you can call Render() multiple times (e.g for VR renders), up to you to communicate the extra state to your RenderDrawListFn function.
@@ -113,6 +113,7 @@
  - window: autofit is losing its purpose when user relies on any dynamic layout (window width multiplier, column). maybe just discard autofit?
  - window: support horizontal scroll
  - window: fix resize grip scaling along with Rounding style setting
+ - window/style: add global alpha modifier (not just "fill_alpha")
  - widgets: switching from "widget-label" to "label-widget" would make it more convenient to integrate widgets in trees
  - widgets: clip text? hover clipped text shows it in a tooltip or in-place overlay
  - main: make IsHovered() more consistent for various type of widgets, widgets with multiple components, etc. also effectively IsHovered() region sometimes differs from hot region, e.g tree nodes
@@ -145,7 +146,6 @@
  - filters: handle wildcards (with implicit leading/trailing *), regexps
  - shortcuts: add a shortcut api, e.g. parse "&Save" and/or "Save (CTRL+S)", pass in to widgets or provide simple ways to use (button=activate, input=focus)
  - keyboard: full keyboard navigation and focus
- - clipboard: add a default "local" implementation of clipboard functions (user will only need to override them to connect to OS clipboard)
  - misc: not thread-safe
  - optimisation/render: use indexed rendering
  - optimisation/render: move clip-rect to vertex data? would allow merging all commands
@@ -153,8 +153,6 @@
  - optimisation: turn some the various stack vectors into statically-sized arrays
  - optimisation: better clipping for multi-component widgets
  - optimisation: specialize for height based clipping first (assume widgets never go up + height tests before width tests?)
- - optimisation/portability: provide ImVector style implementation
- - optimisation/portability: remove dependency on <algorithm>
 */
 
 #include "imgui.h"
@@ -196,6 +194,13 @@ static ImGuiWindow* FindHoveredWindow(ImVec2 pos, bool excluding_childs);
 
 }; // namespace ImGui
 
+//-----------------------------------------------------------------------------
+// Platform dependant default implementations
+//-----------------------------------------------------------------------------
+
+static const char*	GetClipboardTextFn_DefaultImpl();
+static void			SetClipboardTextFn_DefaultImpl(const char* text, const char* text_end);
+
 //-----------------------------------------------------------------------------
 // User facing structures
 //-----------------------------------------------------------------------------
@@ -268,6 +273,10 @@ ImGuiIO::ImGuiIO()
 	MousePosPrev = ImVec2(-1,-1);
 	MouseDoubleClickTime = 0.30f;
 	MouseDoubleClickMaxDist = 6.0f;
+
+	// Platform dependant default implementations
+	GetClipboardTextFn = GetClipboardTextFn_DefaultImpl;
+	SetClipboardTextFn = SetClipboardTextFn_DefaultImpl;
 }
 
 // Pass in translated ASCII characters for text input.
@@ -287,8 +296,7 @@ void ImGuiIO::AddInputCharacter(char c)
 // Helpers
 //-----------------------------------------------------------------------------
 
-#undef ARRAYSIZE
-#define ARRAYSIZE(_ARR)			((int)(sizeof(_ARR)/sizeof(*_ARR)))
+#define IM_ARRAYSIZE(_ARR)			((int)(sizeof(_ARR)/sizeof(*_ARR)))
 
 #undef PI
 const float PI = 3.14159265358979323846f;
@@ -421,7 +429,7 @@ static void ImConvertColorRGBtoHSV(float r, float g, float b, float& out_h, floa
 	}
 
 	const float chroma = r - (g < b ? g : b);
-	out_h = abs(K + (g - b) / (6.f * chroma + 1e-20f));
+	out_h = fabsf(K + (g - b) / (6.f * chroma + 1e-20f));
 	out_s = chroma / (r + 1e-20f);
 	out_v = r;
 }
@@ -498,6 +506,7 @@ struct ImGuiDrawContext
 	float					PrevLineHeight;
 	float					LogLineHeight;
 	int						TreeDepth;
+	ImGuiAabb				LastItemAabb;
 	bool					LastItemHovered;
 	ImVector<ImGuiWindow*>	ChildWindows;
 	ImVector<bool>			AllowKeyboardFocus;
@@ -520,6 +529,7 @@ struct ImGuiDrawContext
 		CurrentLineHeight = PrevLineHeight = 0.0f;
 		LogLineHeight = -1.0f;
 		TreeDepth = 0;
+		LastItemAabb = ImGuiAabb(0.0f,0.0f,0.0f,0.0f);
 		LastItemHovered = false;
 		StateStorage = NULL;
 		OpenNextNode = -1;
@@ -609,6 +619,7 @@ struct ImGuiState
 	ImGuiStorage			ColorEditModeStorage;				// for user selection
 	ImGuiID					ActiveComboID;
 	char					Tooltip[1024];
+	char*					PrivateClipboard;					// if no custom clipboard handler is defined
 
 	// Logging
 	bool					LogEnabled;
@@ -632,6 +643,7 @@ struct ImGuiState
 		SliderAsInputTextId = 0;
 		ActiveComboID = 0;
 		memset(Tooltip, 0, sizeof(Tooltip));
+		PrivateClipboard = NULL;
 		LogEnabled = false;
 		LogFile = NULL;
 		LogAutoExpandMaxDepth = 2;
@@ -795,7 +807,7 @@ void ImGuiTextFilter::Draw(const char* label, float width)
 		width = ImMax(window->Pos.x + ImGui::GetWindowContentRegionMax().x - window->DC.CursorPos.x - (label_size.x + GImGui.Style.ItemSpacing.x*4), 10.0f);
 	}
 	ImGui::PushItemWidth(width);
-	ImGui::InputText(label, InputBuf, ARRAYSIZE(InputBuf));
+	ImGui::InputText(label, InputBuf, IM_ARRAYSIZE(InputBuf));
 	ImGui::PopItemWidth();
 	Build();
 }
@@ -1057,7 +1069,7 @@ static void LoadSettings()
 		if (line_start[0] == '[' && line_end > line_start && line_end[-1] == ']')
 		{
 			char name[64];
-			ImFormatString(name, ARRAYSIZE(name), "%.*s", line_end-line_start-2, line_start+1);
+			ImFormatString(name, IM_ARRAYSIZE(name), "%.*s", line_end-line_start-2, line_start+1);
 			settings = FindWindowSettings(name);
 		}
 		else if (settings)
@@ -1172,7 +1184,7 @@ void NewFrame()
 	else
 		g.IO.MouseDelta = g.IO.MousePos - g.IO.MousePosPrev;
 	g.IO.MousePosPrev = g.IO.MousePos;
-	for (size_t i = 0; i < ARRAYSIZE(g.IO.MouseDown); i++)
+	for (size_t i = 0; i < IM_ARRAYSIZE(g.IO.MouseDown); i++)
 	{
 		g.IO.MouseDownTime[i] = g.IO.MouseDown[i] ? (g.IO.MouseDownTime[i] < 0.0f ? 0.0f : g.IO.MouseDownTime[i] + g.IO.DeltaTime) : -1.0f;
 		g.IO.MouseClicked[i] = (g.IO.MouseDownTime[i] == 0.0f);
@@ -1192,7 +1204,7 @@ void NewFrame()
 			}
 		}
 	}
-	for (size_t i = 0; i < ARRAYSIZE(g.IO.KeysDown); i++)
+	for (size_t i = 0; i < IM_ARRAYSIZE(g.IO.KeysDown); i++)
 		g.IO.KeysDownTime[i] = g.IO.KeysDown[i] ? (g.IO.KeysDownTime[i] < 0.0f ? 0.0f : g.IO.KeysDownTime[i] + g.IO.DeltaTime) : -1.0f;
 
 	// Clear reference to active widget if the widget isn't alive anymore
@@ -1292,6 +1304,12 @@ void Shutdown()
 		g.IO.Font = NULL;
 	}
 
+	if (g.PrivateClipboard)
+	{
+		free(g.PrivateClipboard);
+		g.PrivateClipboard = NULL;
+	}
+
 	g.Initialized = false;
 }
 
@@ -1605,7 +1623,7 @@ static bool IsKeyPressedMap(ImGuiKey key, bool repeat)
 bool IsKeyPressed(int key_index, bool repeat)
 {
 	ImGuiState& g = GImGui;
-	IM_ASSERT(key_index >= 0 && key_index < ARRAYSIZE(g.IO.KeysDown));
+	IM_ASSERT(key_index >= 0 && key_index < IM_ARRAYSIZE(g.IO.KeysDown));
 	const float t = g.IO.KeysDownTime[key_index];
 	if (t == 0.0f)
 		return true;
@@ -1623,7 +1641,7 @@ bool IsKeyPressed(int key_index, bool repeat)
 bool IsMouseClicked(int button, bool repeat)
 {
 	ImGuiState& g = GImGui;
-	IM_ASSERT(button >= 0 && button < ARRAYSIZE(g.IO.MouseDown));
+	IM_ASSERT(button >= 0 && button < IM_ARRAYSIZE(g.IO.MouseDown));
 	const float t = g.IO.MouseDownTime[button];
 	if (t == 0.0f)
 		return true;
@@ -1641,7 +1659,7 @@ bool IsMouseClicked(int button, bool repeat)
 bool IsMouseDoubleClicked(int button)
 {
 	ImGuiState& g = GImGui;
-	IM_ASSERT(button >= 0 && button < ARRAYSIZE(g.IO.MouseDown));
+	IM_ASSERT(button >= 0 && button < IM_ARRAYSIZE(g.IO.MouseDown));
 	return g.IO.MouseDoubleClicked[button];
 }
 
@@ -1656,12 +1674,24 @@ bool IsHovered()
 	return window->DC.LastItemHovered;
 }
 
+ImVec2 GetItemBoxMin()
+{
+	ImGuiWindow* window = GetCurrentWindow();
+	return window->DC.LastItemAabb.Min;
+}
+
+ImVec2 GetItemBoxMax()
+{
+	ImGuiWindow* window = GetCurrentWindow();
+	return window->DC.LastItemAabb.Max;
+}
+
 void SetTooltip(const char* fmt, ...)
 {
 	ImGuiState& g = GImGui;
 	va_list args;
 	va_start(args, fmt);
-	ImFormatStringV(g.Tooltip, ARRAYSIZE(g.Tooltip), fmt, args);
+	ImFormatStringV(g.Tooltip, IM_ARRAYSIZE(g.Tooltip), fmt, args);
 	va_end(args);
 }
 
@@ -1714,7 +1744,7 @@ void BeginChild(const char* str_id, ImVec2 size, bool border, ImGuiWindowFlags e
 	flags |= extra_flags;
 
 	char title[256];
-	ImFormatString(title, ARRAYSIZE(title), "%s.%s", window->Name, str_id);
+	ImFormatString(title, IM_ARRAYSIZE(title), "%s.%s", window->Name, str_id);
 
 	const float alpha = (flags & ImGuiWindowFlags_ComboBox) ? 1.0f : 0.0f;
 	ImGui::Begin(title, NULL, size, alpha, flags);
@@ -1803,15 +1833,13 @@ bool Begin(const char* name, bool* open, ImVec2 size, float fill_alpha, ImGuiWin
 			parent_window->DC.ChildWindows.push_back(window);
 			window->Pos = window->PosFloat = parent_window->DC.CursorPos;
 			window->SizeFull = size;
-			if (!(flags & ImGuiWindowFlags_ComboBox))
-				ImGui::PushClipRect(parent_window->ClipRectStack.back());
-			else
-				ImGui::PushClipRect(ImVec4(0.0f, 0.0f, g.IO.DisplaySize.x, g.IO.DisplaySize.y));
 		}
+
+		// Outer clipping rectangle
+		if ((flags & ImGuiWindowFlags_ChildWindow) && !(flags & ImGuiWindowFlags_ComboBox))
+			ImGui::PushClipRect(g.CurrentWindowStack[g.CurrentWindowStack.size()-2]->ClipRectStack.back());
 		else
-		{
 			ImGui::PushClipRect(ImVec4(0.0f, 0.0f, g.IO.DisplaySize.x, g.IO.DisplaySize.y));
-		}
 
 		// ID stack
 		window->IDStack.resize(0);
@@ -2052,8 +2080,16 @@ bool Begin(const char* name, bool* open, ImVec2 size, float fill_alpha, ImGuiWin
 				ImGui::CloseWindowButton(open);
 		}
 	}
+	else
+	{
+		// Outer clipping rectangle
+		if ((flags & ImGuiWindowFlags_ChildWindow) && !(flags & ImGuiWindowFlags_ComboBox))
+			ImGui::PushClipRect(g.CurrentWindowStack[g.CurrentWindowStack.size()-2]->ClipRectStack.back());
+		else
+			ImGui::PushClipRect(ImVec4(0.0f, 0.0f, g.IO.DisplaySize.x, g.IO.DisplaySize.y));
+	}
 
-	// Clip rectangle
+	// Innter clipping rectangle
 	// We set this up after processing the resize grip so that our clip rectangle doesn't lag by a frame
 	const ImGuiAabb title_bar_aabb = window->TitleBarAabb();
 	ImVec4 clip_rect(title_bar_aabb.Min.x+0.5f, title_bar_aabb.Max.y+0.5f, window->Aabb().Max.x-1.5f, window->Aabb().Max.y-1.5f);
@@ -2335,7 +2371,7 @@ void TextV(const char* fmt, va_list args)
 		return;
 
 	static char buf[1024];
-	const char* text_end = buf + ImFormatStringV(buf, ARRAYSIZE(buf), fmt, args);
+	const char* text_end = buf + ImFormatStringV(buf, IM_ARRAYSIZE(buf), fmt, args);
 	TextUnformatted(buf, text_end);
 }
 
@@ -2470,7 +2506,7 @@ void LabelText(const char* label, const char* fmt, ...)
 	va_list args;
 	va_start(args, fmt);
 	const char* text_begin = &buf[0];
-	const char* text_end = text_begin + ImFormatStringV(buf, ARRAYSIZE(buf), fmt, args);
+	const char* text_end = text_begin + ImFormatStringV(buf, IM_ARRAYSIZE(buf), fmt, args);
 	va_end(args);
 
 	const ImVec2 text_size = CalcTextSize(label);
@@ -2778,7 +2814,7 @@ void BulletText(const char* fmt, ...)
 	va_list args;
 	va_start(args, fmt);
 	const char* text_begin = buf;
-	const char* text_end = text_begin + ImFormatStringV(buf, ARRAYSIZE(buf), fmt, args);
+	const char* text_end = text_begin + ImFormatStringV(buf, IM_ARRAYSIZE(buf), fmt, args);
 	va_end(args);
 
 	const float line_height = window->FontSize();
@@ -2800,7 +2836,7 @@ bool TreeNode(const char* str_id, const char* fmt, ...)
 	static char buf[1024];
 	va_list args;
 	va_start(args, fmt);
-	ImFormatStringV(buf, ARRAYSIZE(buf), fmt, args);
+	ImFormatStringV(buf, IM_ARRAYSIZE(buf), fmt, args);
 	va_end(args);
 
 	if (!str_id || !str_id[0])
@@ -2821,7 +2857,7 @@ bool TreeNode(const void* ptr_id, const char* fmt, ...)
 	static char buf[1024];
 	va_list args;
 	va_start(args, fmt);
-	ImFormatStringV(buf, ARRAYSIZE(buf), fmt, args);
+	ImFormatStringV(buf, IM_ARRAYSIZE(buf), fmt, args);
 	va_end(args);
 
 	if (!ptr_id)
@@ -2981,8 +3017,8 @@ bool SliderFloat(const char* label, float* v, float v_min, float v_max, const ch
 		if (v_min * v_max < 0.0f)
 		{
 			// Different sign
-			const float linear_dist_min_to_0 = powf(abs(0.0f - v_min), 1.0f/power);
-			const float linear_dist_max_to_0 = powf(abs(v_max - 0.0f), 1.0f/power);
+			const float linear_dist_min_to_0 = powf(fabsf(0.0f - v_min), 1.0f/power);
+			const float linear_dist_max_to_0 = powf(fabsf(v_max - 0.0f), 1.0f/power);
 			linear_zero_pos = linear_dist_min_to_0 / (linear_dist_min_to_0+linear_dist_max_to_0);
 		}
 		else
@@ -3014,12 +3050,12 @@ bool SliderFloat(const char* label, float* v, float v_min, float v_max, const ch
 	if (start_text_input || (g.ActiveId == id && id == g.SliderAsInputTextId))
 	{
 		char text_buf[64];
-		ImFormatString(text_buf, ARRAYSIZE(text_buf), "%.*f", decimal_precision, *v);
+		ImFormatString(text_buf, IM_ARRAYSIZE(text_buf), "%.*f", decimal_precision, *v);
 
 		g.ActiveId = g.SliderAsInputTextId;
 		g.HoveredId = 0;
 		window->FocusItemUnregister();	// Our replacement slider will override the focus ID (that we needed to declare previously to allow for a TAB focus to happen before we got selected)
-		value_changed = ImGui::InputText(label, text_buf, ARRAYSIZE(text_buf), ImGuiInputTextFlags_CharsDecimal | ImGuiInputTextFlags_AutoSelectAll | ImGuiInputTextFlags_AlignCenter);
+		value_changed = ImGui::InputText(label, text_buf, IM_ARRAYSIZE(text_buf), ImGuiInputTextFlags_CharsDecimal | ImGuiInputTextFlags_AutoSelectAll | ImGuiInputTextFlags_AlignCenter);
 		if (g.SliderAsInputTextId == 0)
 		{
 			// First frame
@@ -3052,7 +3088,7 @@ bool SliderFloat(const char* label, float* v, float v_min, float v_max, const ch
 			if (!is_unbound)
 			{
 				const float normalized_pos = ImClamp((g.IO.MousePos.x - slider_effective_x1) / slider_effective_w, 0.0f, 1.0f);
-
+				
 				// Linear slider
 				//float new_value = ImLerp(v_min, v_max, normalized_pos);
 
@@ -3068,9 +3104,11 @@ bool SliderFloat(const char* label, float* v, float v_min, float v_max, const ch
 				else
 				{
 					// Positive: rescale to the positive range before powering
-					float a = normalized_pos;
-					if (abs(linear_zero_pos - 1.0f) > 1.e-6)
-						a = (a - linear_zero_pos) / (1.0f - linear_zero_pos);
+					float a;
+					if (fabsf(linear_zero_pos - 1.0f) > 1.e-6)
+						a = (normalized_pos - linear_zero_pos) / (1.0f - linear_zero_pos);
+					else
+						a = normalized_pos;
 					a = powf(a, power);
 					new_value = ImLerp(ImMax(v_min,0.0f), v_max, a);
 				}
@@ -3127,7 +3165,7 @@ bool SliderFloat(const char* label, float* v, float v_min, float v_max, const ch
 	}
 
 	char value_buf[64];
-	ImFormatString(value_buf, ARRAYSIZE(value_buf), display_format, *v);
+	ImFormatString(value_buf, IM_ARRAYSIZE(value_buf), display_format, *v);
 	RenderText(ImVec2(slider_bb.GetCenter().x-CalcTextSize(value_buf).x*0.5f, frame_bb.Min.y + style.FramePadding.y), value_buf);
 
 	RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, slider_bb.Min.y), label);
@@ -3596,11 +3634,11 @@ bool InputFloat(const char* label, float *v, float step, float step_fast, int de
 
 	char buf[64];
 	if (decimal_precision < 0)
-		ImFormatString(buf, ARRAYSIZE(buf), "%f", *v);		// Ideally we'd have a minimum decimal precision of 1 to visually denote that it is a float, while hiding non-significant digits?
+		ImFormatString(buf, IM_ARRAYSIZE(buf), "%f", *v);		// Ideally we'd have a minimum decimal precision of 1 to visually denote that it is a float, while hiding non-significant digits?
 	else
-		ImFormatString(buf, ARRAYSIZE(buf), "%.*f", decimal_precision, *v);
+		ImFormatString(buf, IM_ARRAYSIZE(buf), "%.*f", decimal_precision, *v);
 	bool value_changed = false;
-	if (ImGui::InputText("", buf, ARRAYSIZE(buf), ImGuiInputTextFlags_CharsDecimal|ImGuiInputTextFlags_AlignCenter|ImGuiInputTextFlags_AutoSelectAll))
+	if (ImGui::InputText("", buf, IM_ARRAYSIZE(buf), ImGuiInputTextFlags_CharsDecimal|ImGuiInputTextFlags_AlignCenter|ImGuiInputTextFlags_AutoSelectAll))
 	{
 		ApplyNumericalTextInput(buf, v);
 		value_changed = true;
@@ -3705,7 +3743,7 @@ bool InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlag
 	bool cancel_edit = false;
 	if (g.ActiveId == id)
 	{
-		edit_state.BufSize = buf_size < ARRAYSIZE(edit_state.Text) ? buf_size : ARRAYSIZE(edit_state.Text);
+		edit_state.BufSize = buf_size < IM_ARRAYSIZE(edit_state.Text) ? buf_size : IM_ARRAYSIZE(edit_state.Text);
 		edit_state.Font = window->Font();
 		edit_state.FontSize = window->FontSize();
 	
@@ -3788,7 +3826,7 @@ bool InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlag
 		else if (g.IO.InputCharacters[0])
 		{
 			// Text input
-			for (int n = 0; n < ARRAYSIZE(g.IO.InputCharacters) && g.IO.InputCharacters[n]; n++)
+			for (int n = 0; n < IM_ARRAYSIZE(g.IO.InputCharacters) && g.IO.InputCharacters[n]; n++)
 			{
 				const char c = g.IO.InputCharacters[n];
 				if (c)
@@ -4220,7 +4258,7 @@ bool ColorEdit4(const char* label, float col[4], bool alpha)
 			else
 				sprintf(buf, "#%02X%02X%02X", ix, iy, iz);
 			ImGui::PushItemWidth(w_slider_all - g.Style.ItemInnerSpacing.x);
-			value_changed |= ImGui::InputText("##Text", buf, ARRAYSIZE(buf), ImGuiInputTextFlags_CharsHexadecimal);
+			value_changed |= ImGui::InputText("##Text", buf, IM_ARRAYSIZE(buf), ImGuiInputTextFlags_CharsHexadecimal);
 			ImGui::PopItemWidth();
 			char* p = buf;
 			while (*p == '#' || *p == ' ' || *p == '\t') 
@@ -4378,6 +4416,7 @@ bool IsClipped(ImVec2 item_size)
 static bool ClipAdvance(const ImGuiAabb& bb)
 {
 	ImGuiWindow* window = GetCurrentWindow();
+	window->DC.LastItemAabb = bb;
 	if (ImGui::IsClipped(bb))
 	{
 		window->DC.LastItemHovered = false;
@@ -4667,7 +4706,7 @@ void ImDrawList::AddVtx(const ImVec2& pos, ImU32 col)
 {
 	vtx_write->pos = pos;
 	vtx_write->col = col;
-	vtx_write->uv = IMDRAW_TEX_UV_FOR_WHITE;
+	vtx_write->uv = IMGUI_FONT_TEX_UV_FOR_WHITE;
 	vtx_write++;
 }
 
@@ -4700,9 +4739,9 @@ void ImDrawList::AddArc(const ImVec2& center, float rad, ImU32 col, int a_min, i
 	static bool circle_vtx_builds = false;
 	if (!circle_vtx_builds)
 	{
-		for (int i = 0; i < ARRAYSIZE(circle_vtx); i++)
+		for (int i = 0; i < IM_ARRAYSIZE(circle_vtx); i++)
 		{
-			const float a = ((float)i / (float)ARRAYSIZE(circle_vtx)) * 2*PI;
+			const float a = ((float)i / (float)IM_ARRAYSIZE(circle_vtx)) * 2*PI;
 			circle_vtx[i].x = cos(a + PI);
 			circle_vtx[i].y = sin(a + PI);
 		}
@@ -4714,8 +4753,8 @@ void ImDrawList::AddArc(const ImVec2& center, float rad, ImU32 col, int a_min, i
 		ReserveVertices((a_max-a_min) * 3);
 		for (int a = a_min; a < a_max; a++)
 		{
-			AddVtx(center + circle_vtx[a % ARRAYSIZE(circle_vtx)] * rad, col);
-			AddVtx(center + circle_vtx[(a+1) % ARRAYSIZE(circle_vtx)] * rad, col);
+			AddVtx(center + circle_vtx[a % IM_ARRAYSIZE(circle_vtx)] * rad, col);
+			AddVtx(center + circle_vtx[(a+1) % IM_ARRAYSIZE(circle_vtx)] * rad, col);
 			AddVtx(center + third_point_offset, col);
 		}
 	}
@@ -4723,7 +4762,7 @@ void ImDrawList::AddArc(const ImVec2& center, float rad, ImU32 col, int a_min, i
 	{
 		ReserveVertices((a_max-a_min) * 6);
 		for (int a = a_min; a < a_max; a++)
-			AddVtxLine(center + circle_vtx[a % ARRAYSIZE(circle_vtx)] * rad, center + circle_vtx[(a+1) % ARRAYSIZE(circle_vtx)] * rad, col);
+			AddVtxLine(center + circle_vtx[a % IM_ARRAYSIZE(circle_vtx)] * rad, center + circle_vtx[(a+1) % IM_ARRAYSIZE(circle_vtx)] * rad, col);
 	}
 }
 
@@ -4732,10 +4771,10 @@ void ImDrawList::AddRect(const ImVec2& a, const ImVec2& b, ImU32 col, float roun
 	if ((col >> 24) == 0)
 		return;
 
-	//const float r = ImMin(rounding, ImMin(abs(b.x-a.x), abs(b.y-a.y))*0.5f);
+	//const float r = ImMin(rounding, ImMin(fabsf(b.x-a.x), fabsf(b.y-a.y))*0.5f);
 	float r = rounding;
-	r = ImMin(r, abs(b.x-a.x) * ( ((rounding_corners&(1|2))==(1|2)) || ((rounding_corners&(4|8))==(4|8)) ? 0.5f : 1.0f ));
-	r = ImMin(r, abs(b.y-a.y) * ( ((rounding_corners&(1|8))==(1|8)) || ((rounding_corners&(2|4))==(2|4)) ? 0.5f : 1.0f ));
+	r = ImMin(r, fabsf(b.x-a.x) * ( ((rounding_corners&(1|2))==(1|2)) || ((rounding_corners&(4|8))==(4|8)) ? 0.5f : 1.0f ));
+	r = ImMin(r, fabsf(b.y-a.y) * ( ((rounding_corners&(1|8))==(1|8)) || ((rounding_corners&(2|4))==(2|4)) ? 0.5f : 1.0f ));
 
 	if (r == 0.0f || rounding_corners == 0)
 	{
@@ -4765,10 +4804,10 @@ void ImDrawList::AddRectFilled(const ImVec2& a, const ImVec2& b, ImU32 col, floa
 	if ((col >> 24) == 0)
 		return;
 
-	//const float r = ImMin(rounding, ImMin(abs(b.x-a.x), abs(b.y-a.y))*0.5f);
+	//const float r = ImMin(rounding, ImMin(fabsf(b.x-a.x), fabsf(b.y-a.y))*0.5f);
 	float r = rounding;
-	r = ImMin(r, abs(b.x-a.x) * ( ((rounding_corners&(1|2))==(1|2)) || ((rounding_corners&(4|8))==(4|8)) ? 0.5f : 1.0f ));
-	r = ImMin(r, abs(b.y-a.y) * ( ((rounding_corners&(1|8))==(1|8)) || ((rounding_corners&(2|4))==(2|4)) ? 0.5f : 1.0f ));
+	r = ImMin(r, fabsf(b.x-a.x) * ( ((rounding_corners&(1|2))==(1|2)) || ((rounding_corners&(4|8))==(4|8)) ? 0.5f : 1.0f ));
+	r = ImMin(r, fabsf(b.y-a.y) * ( ((rounding_corners&(1|8))==(1|8)) || ((rounding_corners&(2|4))==(2|4)) ? 0.5f : 1.0f ));
 
 	if (r == 0.0f || rounding_corners == 0)
 	{
@@ -5161,6 +5200,81 @@ void ImBitmapFont::RenderText(float size, ImVec2 pos, ImU32 col, const ImVec4& c
 	}
 }
 
+//-----------------------------------------------------------------------------
+// PLATFORM DEPENDANT HELPERS
+//-----------------------------------------------------------------------------
+
+#if defined(_MSC_VER) && !defined(IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCS)
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+// Win32 API clipboard implementation
+static const char*	GetClipboardTextFn_DefaultImpl()
+{
+	static char* buf_local = NULL;
+	if (buf_local)
+	{
+		free(buf_local);
+		buf_local = NULL;
+	}
+	if (!OpenClipboard(NULL)) 
+		return NULL;
+	HANDLE buf_handle = GetClipboardData(CF_TEXT); 
+	if (buf_handle == NULL)
+		return NULL;
+	if (char* buf_global = (char*)GlobalLock(buf_handle))
+		buf_local = strdup(buf_global);
+	GlobalUnlock(buf_handle); 
+	CloseClipboard(); 
+	return buf_local;
+}
+
+// Win32 API clipboard implementation
+static void SetClipboardTextFn_DefaultImpl(const char* text, const char* text_end)
+{
+	if (!OpenClipboard(NULL))
+		return;
+	if (!text_end)
+		text_end = text + strlen(text);
+	const int buf_length = (text_end - text) + 1;
+	HGLOBAL buf_handle = GlobalAlloc(GMEM_MOVEABLE, buf_length * sizeof(char)); 
+	if (buf_handle == NULL)
+		return;
+	char* buf_global = (char *)GlobalLock(buf_handle); 
+	memcpy(buf_global, text, text_end - text);
+	buf_global[text_end - text] = 0;
+	GlobalUnlock(buf_handle); 
+	EmptyClipboard();
+	SetClipboardData(CF_TEXT, buf_handle);
+	CloseClipboard();
+}
+
+#else
+
+// Local ImGui-only clipboard implementation, if user hasn't defined better clipboard handlers
+static const char*	GetClipboardTextFn_DefaultImpl()
+{
+	return GImGui.PrivateClipboard;
+}
+
+// Local ImGui-only clipboard implementation, if user hasn't defined better clipboard handlers
+static void SetClipboardTextFn_DefaultImpl(const char* text, const char* text_end)
+{
+	if (GImGui.PrivateClipboard)
+	{
+		free(GImGui.PrivateClipboard);
+		GImGui.PrivateClipboard = NULL;
+	}
+	if (!text_end)
+		text_end = text + strlen(text);
+	GImGui.PrivateClipboard = (char*)malloc(text_end - text + 1);
+	memcpy(GImGui.PrivateClipboard, text, text_end - text);
+	GImGui.PrivateClipboard[text_end - text] = 0;
+}
+
+#endif
+
 //-----------------------------------------------------------------------------
 // HELP
 //-----------------------------------------------------------------------------
@@ -5339,12 +5453,12 @@ void ShowTestWindow(bool* open)
 
 		const char* items[] = { "AAAA", "BBBB", "CCCC", "DDDD", "EEEE", "FFFF", "GGGG", "HHHH", "IIII", "JJJJ", "KKKK" };
 		static int item2 = -1;
-		ImGui::Combo("combo scroll", &item2, items, ARRAYSIZE(items));
+		ImGui::Combo("combo scroll", &item2, items, IM_ARRAYSIZE(items));
 
 		static char str0[128] = "Hello, world!";
 		static int i0=123;
 		static float f0=0.001f;
-		ImGui::InputText("string", str0, ARRAYSIZE(str0));
+		ImGui::InputText("string", str0, IM_ARRAYSIZE(str0));
 		ImGui::InputInt("input int", &i0);
 		ImGui::InputFloat("input float", &f0, 0.01f, 1.0f);
 
@@ -5387,7 +5501,7 @@ void ShowTestWindow(bool* open)
 	if (ImGui::CollapsingHeader("Graphs widgets"))
 	{
 		static float arr[] = { 0.6f, 0.1f, 1.0f, 0.5f, 0.92f, 0.1f, 0.2f };
-		ImGui::PlotLines("Frame Times", arr, ARRAYSIZE(arr));
+		ImGui::PlotLines("Frame Times", arr, IM_ARRAYSIZE(arr));
 
 		static bool pause;
 		static ImVector<float> values; if (values.empty()) { values.resize(100); memset(&values.front(), 0, values.size()*sizeof(float)); } 
@@ -5408,7 +5522,7 @@ void ShowTestWindow(bool* open)
 		ImGui::PlotLines("Frame Times", &values.front(), (int)values.size(), values_offset, "avg 0.0", -1.0f, 1.0f, ImVec2(0,70));
 
 		ImGui::SameLine(); ImGui::Checkbox("pause", &pause);
-		ImGui::PlotHistogram("Histogram", arr, ARRAYSIZE(arr), 0, NULL, 0.0f, 1.0f, ImVec2(0,70));
+		ImGui::PlotHistogram("Histogram", arr, IM_ARRAYSIZE(arr), 0, NULL, 0.0f, 1.0f, ImVec2(0,70));
 	}
 
 	if (ImGui::CollapsingHeader("Widgets on same line"))
@@ -5498,7 +5612,7 @@ void ShowTestWindow(bool* open)
 		for (int i = 0; i < 100; i++)
 		{
 			char buf[32];
-			ImFormatString(buf, ARRAYSIZE(buf), "%08x", i*5731);
+			ImFormatString(buf, IM_ARRAYSIZE(buf), "%08x", i*5731);
 			ImGui::Button(buf);
 			ImGui::NextColumn();
 		}
@@ -5597,7 +5711,7 @@ void ShowTestWindow(bool* open)
 		static ImGuiTextFilter filter;
 		filter.Draw();
 		const char* lines[] = { "aaa1.c", "bbb1.c", "ccc1.c", "aaa2.cpp", "bbb2.cpp", "ccc2.cpp", "abc.h", "hello, world" };
-		for (size_t i = 0; i < ARRAYSIZE(lines); i++)
+		for (size_t i = 0; i < IM_ARRAYSIZE(lines); i++)
 			if (filter.PassFilter(lines[i]))
 				ImGui::BulletText("%s", lines[i]);
 	}

imgui.h

@@ -232,6 +232,8 @@ namespace ImGui
 	void		SetTooltip(const char* fmt, ...);									// set tooltip under mouse-cursor, typically use with ImGui::IsHovered(). (currently no contention handling, last call win)
 	void		SetNewWindowDefaultPos(ImVec2 pos);									// set position of window that do
 	bool		IsHovered();														// was the last item active area hovered by mouse?
+	ImVec2		GetItemBoxMin();													// get bounding box of last item
+	ImVec2		GetItemBoxMax();													// get bounding box of last item
 	bool		IsClipped(ImVec2 item_size);										// to perform coarse clipping on user's side (as an optimisation)
 	bool		IsKeyPressed(int key_index, bool repeat = true);					// key_index into the keys_down[512] array, imgui doesn't know the semantic of each entry
 	bool		IsMouseClicked(int button, bool repeat = false);
@@ -382,10 +384,16 @@ struct ImGuiIO
 	bool		FontAllowScaling;			// = false					// Set to allow scaling text with CTRL+Wheel.
 	float		PixelCenterOffset;			// = 0.5f					// Set to 0.0f for DirectX <= 9, 0.5f for Direct3D >= 10 and OpenGL.
 
-	// Settings - Functions (fill once)
-	void		(*RenderDrawListsFn)(ImDrawList** const draw_lists, int count);	// Required
-	const char*	(*GetClipboardTextFn)();										// Required for clipboard support
-	void		(*SetClipboardTextFn)(const char* text, const char* text_end);	// Required for clipboard support (nb- the string is *NOT* zero-terminated at 'text_end')
+	// Settings - Rendering function (REQUIRED)
+	// See example code if you are unsure of how to implement this.
+	void		(*RenderDrawListsFn)(ImDrawList** const draw_lists, int count);
+
+	// Settings - Clipboard Support
+	// Override to provide your clipboard handlers.
+	// On Windows architecture, defaults to use the native Win32 clipboard, otherwise default to use a ImGui private clipboard. 
+	// NB- for SetClipboardTextFn, the string is *NOT* zero-terminated at 'text_end'
+	const char*	(*GetClipboardTextFn)();										
+	void		(*SetClipboardTextFn)(const char* text, const char* text_end);
 
 	// Input - Fill before calling NewFrame()
 	ImVec2		MousePos;					// Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
@@ -507,8 +515,8 @@ struct ImDrawCmd
 	ImVec4			clip_rect;
 };
 
-#ifndef IMDRAW_TEX_UV_FOR_WHITE
-#define IMDRAW_TEX_UV_FOR_WHITE	ImVec2(0,0)
+#ifndef IMGUI_FONT_TEX_UV_FOR_WHITE
+#define IMGUI_FONT_TEX_UV_FOR_WHITE	ImVec2(0.f,0.f)
 #endif
 
 // sizeof() == 20
@@ -523,8 +531,11 @@ struct ImDrawVert
 // User is responsible for providing a renderer for this in ImGuiIO::RenderDrawListFn
 struct ImDrawList
 {
-	ImVector<ImDrawCmd>		commands;
+	// This is what you have to render
+	ImVector<ImDrawCmd>		commands;			// commands
 	ImVector<ImDrawVert>	vtx_buffer;			// each command consume ImDrawCmd::vtx_count of those
+
+	// [Internal to ImGui]
 	ImVector<ImVec4>		clip_rect_stack;	// [internal] clip rect stack while building the command-list (so text command can perform clipping early on)
 	ImDrawVert*				vtx_write;			// [internal] point within vtx_buffer after each add command (to avoid using the ImVector<> operators too much)