Merge branch 'master' into navigation

examples/allegro5_example/imgui_impl_a5.cpp

@@ -215,6 +215,7 @@ bool ImGui_ImplA5_ProcessEvent(ALLEGRO_EVENT *ev)
     {
     case ALLEGRO_EVENT_MOUSE_AXES:
         io.MouseWheel += ev->mouse.dz;
+        io.MouseWheelH += ev->mouse.dw;
         return true;
     case ALLEGRO_EVENT_KEY_CHAR:
         if (ev->keyboard.display == g_Display)

examples/apple_example/imguiex-ios/imgui_impl_ios.mm

@@ -587,9 +587,9 @@ void ImGui_ClipboardCallback(uSynergyCookie cookie, enum uSynergyClipboardFormat
             io.MouseDown[i] = g_MousePressed[i];
         }
 
-        // This is an arbitrary scaling factor that works for me. Not sure what units these
-        // mousewheel values from synergy are supposed to be in
+        // This is an arbitrary scaling factor that works for me. Not sure what units these mousewheel values from synergy are supposed to be in.
         io.MouseWheel = g_mouseWheelY / 500.0;
+        io.MouseWheelH = g_mouseWheelX / 500.0;
     }
     else
     {

examples/directx10_example/imgui_impl_dx10.cpp

@@ -275,6 +275,9 @@ IMGUI_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARAM wPa
     case WM_MOUSEWHEEL:
         io.MouseWheel += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
         return 0;
+    case WM_MOUSEHWHEEL:
+        io.MouseWheelH += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
+        return 0;
     case WM_MOUSEMOVE:
         io.MousePos.x = (signed short)(lParam);
         io.MousePos.y = (signed short)(lParam >> 16);

examples/directx11_example/imgui_impl_dx11.cpp

@@ -282,6 +282,9 @@ IMGUI_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARAM wPa
     case WM_MOUSEWHEEL:
         io.MouseWheel += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
         return 0;
+    case WM_MOUSEHWHEEL:
+        io.MouseWheelH += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
+        return 0;
     case WM_MOUSEMOVE:
         io.MousePos.x = (signed short)(lParam);
         io.MousePos.y = (signed short)(lParam >> 16);

examples/directx9_example/imgui_impl_dx9.cpp

@@ -221,6 +221,9 @@ IMGUI_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARAM wPa
     case WM_MOUSEWHEEL:
         io.MouseWheel += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
         return 0;
+    case WM_MOUSEHWHEEL:
+        io.MouseWheelH += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
+        return 0;
     case WM_MOUSEMOVE:
         io.MousePos.x = (signed short)(lParam);
         io.MousePos.y = (signed short)(lParam >> 16);

examples/marmalade_example/imgui_impl_marmalade.cpp

@@ -21,7 +21,6 @@
 // Data
 static double       g_Time = 0.0f;
 static bool         g_MousePressed[3] = { false, false, false };
-static float        g_MouseWheel = 0.0f;
 static CIwTexture*  g_FontTexture = NULL;
 static char*        g_ClipboardText = NULL;
 static bool         g_osdKeyboardEnabled = false;
@@ -128,9 +127,9 @@ int32 ImGui_Marmalade_PointerButtonEventCallback(void* SystemData, void* pUserDa
         if (pEvent->m_Button == S3E_POINTER_BUTTON_MIDDLEMOUSE)
             g_MousePressed[2] = true;
         if (pEvent->m_Button == S3E_POINTER_BUTTON_MOUSEWHEELUP)
-            g_MouseWheel += pEvent->m_y;
+            io.MouseWheel += pEvent->m_y;
         if (pEvent->m_Button == S3E_POINTER_BUTTON_MOUSEWHEELDOWN)
-            g_MouseWheel += pEvent->m_y;
+            io.MouseWheel += pEvent->m_y;
     }
 
     return 0;
@@ -282,9 +281,6 @@ void ImGui_Marmalade_NewFrame()
         g_MousePressed[i] = false;
     }
 
-    io.MouseWheel = g_MouseWheel;
-    g_MouseWheel = 0.0f;
-
     // TODO: Hide OS mouse cursor if ImGui is drawing it
     // s3ePointerSetInt(S3E_POINTER_HIDE_CURSOR,(io.MouseDrawCursor ? 0 : 1));
 

examples/opengl2_example/imgui_impl_glfw_gl2.cpp

@@ -31,7 +31,6 @@
 static GLFWwindow*  g_Window = NULL;
 static double       g_Time = 0.0f;
 static bool         g_MouseJustPressed[3] = { false, false, false };
-static float        g_MouseWheel = 0.0f;
 static GLuint       g_FontTexture = 0;
 
 // This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
@@ -134,9 +133,11 @@ void ImGui_ImplGlfwGL2_MouseButtonCallback(GLFWwindow*, int button, int action,
         g_MouseJustPressed[button] = true;
 }
 
-void ImGui_ImplGlfwGL2_ScrollCallback(GLFWwindow*, double /*xoffset*/, double yoffset)
+void ImGui_ImplGlfwGL2_ScrollCallback(GLFWwindow*, double xoffset, double yoffset)
 {
-    g_MouseWheel += (float)yoffset; // Use fractional mouse wheel.
+    ImGuiIO& io = ImGui::GetIO();
+    io.MouseWheelH += (float)xoffset;
+    io.MouseWheel += (float)yoffset;
 }
 
 void ImGui_ImplGlfwGL2_KeyCallback(GLFWwindow*, int key, int, int action, int mods)
@@ -295,9 +296,6 @@ void ImGui_ImplGlfwGL2_NewFrame()
         g_MouseJustPressed[i] = false;
     }
 
-    io.MouseWheel = g_MouseWheel;
-    g_MouseWheel = 0.0f;
-
     // Hide OS mouse cursor if ImGui is drawing it
     glfwSetInputMode(g_Window, GLFW_CURSOR, io.MouseDrawCursor ? GLFW_CURSOR_HIDDEN : GLFW_CURSOR_NORMAL);
 

examples/opengl3_example/imgui_impl_glfw_gl3.cpp

@@ -25,7 +25,6 @@
 static GLFWwindow*  g_Window = NULL;
 static double       g_Time = 0.0f;
 static bool         g_MouseJustPressed[3] = { false, false, false };
-static float        g_MouseWheel = 0.0f;
 static GLuint       g_FontTexture = 0;
 static int          g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0;
 static int          g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0;
@@ -155,9 +154,11 @@ void ImGui_ImplGlfwGL3_MouseButtonCallback(GLFWwindow*, int button, int action,
         g_MouseJustPressed[button] = true;
 }
 
-void ImGui_ImplGlfwGL3_ScrollCallback(GLFWwindow*, double /*xoffset*/, double yoffset)
+void ImGui_ImplGlfwGL3_ScrollCallback(GLFWwindow*, double xoffset, double yoffset)
 {
-    g_MouseWheel += (float)yoffset; // Use fractional mouse wheel.
+    ImGuiIO& io = ImGui::GetIO();
+    io.MouseWheelH += (float)xoffset;
+    io.MouseWheel += (float)yoffset;
 }
 
 void ImGui_ImplGlfwGL3_KeyCallback(GLFWwindow*, int key, int, int action, int mods)
@@ -407,9 +408,6 @@ void ImGui_ImplGlfwGL3_NewFrame()
         g_MouseJustPressed[i] = false;
     }
 
-    io.MouseWheel = g_MouseWheel;
-    g_MouseWheel = 0.0f;
-
     // Hide OS mouse cursor if ImGui is drawing it
     glfwSetInputMode(g_Window, GLFW_CURSOR, io.MouseDrawCursor ? GLFW_CURSOR_HIDDEN : GLFW_CURSOR_NORMAL);
 

examples/sdl_opengl2_example/imgui_impl_sdl_gl2.cpp

@@ -24,7 +24,6 @@
 // Data
 static double       g_Time = 0.0f;
 static bool         g_MousePressed[3] = { false, false, false };
-static float        g_MouseWheel = 0.0f;
 static GLuint       g_FontTexture = 0;
 
 // This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
@@ -132,10 +131,10 @@ bool ImGui_ImplSdlGL2_ProcessEvent(SDL_Event* event)
     {
     case SDL_MOUSEWHEEL:
         {
-            if (event->wheel.y > 0)
-                g_MouseWheel = 1;
-            if (event->wheel.y < 0)
-                g_MouseWheel = -1;
+            if (event->wheel.x > 0) io.MouseWheelH += 1;
+            if (event->wheel.x < 0) io.MouseWheelH -= 1;
+            if (event->wheel.y > 0) io.MouseWheel += 1;
+            if (event->wheel.y < 0) io.MouseWheel -= 1;
             return true;
         }
     case SDL_MOUSEBUTTONDOWN:
@@ -274,12 +273,10 @@ void ImGui_ImplSdlGL2_NewFrame(SDL_Window *window)
     int mx, my;
     Uint32 mouse_buttons = SDL_GetMouseState(&mx, &my);
     io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
-    io.MouseWheel = g_MouseWheel;
     io.MouseDown[0] = g_MousePressed[0] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0;  // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
     io.MouseDown[1] = g_MousePressed[1] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0;
     io.MouseDown[2] = g_MousePressed[2] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0;
     g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false;
-    g_MouseWheel = 0.0f;
 
     // We need to use SDL_CaptureMouse() to easily retrieve mouse coordinates outside of the client area. This is only supported from SDL 2.0.4 (released Jan 2016)
 #if (SDL_MAJOR_VERSION >= 2) && (SDL_MINOR_VERSION >= 0) && (SDL_PATCHLEVEL >= 4)   

examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp

@@ -19,7 +19,6 @@
 // Data
 static double       g_Time = 0.0f;
 static bool         g_MousePressed[3] = { false, false, false };
-static float        g_MouseWheel = 0.0f;
 static GLuint       g_FontTexture = 0;
 static int          g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0;
 static int          g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0;
@@ -154,10 +153,10 @@ bool ImGui_ImplSdlGL3_ProcessEvent(SDL_Event* event)
     {
     case SDL_MOUSEWHEEL:
         {
-            if (event->wheel.y > 0)
-                g_MouseWheel = 1;
-            if (event->wheel.y < 0)
-                g_MouseWheel = -1;
+            if (event->wheel.x > 0) io.MouseWheelH += 1;
+            if (event->wheel.x < 0) io.MouseWheelH -= 1;
+            if (event->wheel.y > 0) io.MouseWheel += 1;
+            if (event->wheel.y < 0) io.MouseWheel -= 1;
             return true;
         }
     case SDL_MOUSEBUTTONDOWN:
@@ -385,12 +384,10 @@ void ImGui_ImplSdlGL3_NewFrame(SDL_Window* window)
     int mx, my;
     Uint32 mouse_buttons = SDL_GetMouseState(&mx, &my);
     io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
-    io.MouseWheel = g_MouseWheel;
     io.MouseDown[0] = g_MousePressed[0] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0;  // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
     io.MouseDown[1] = g_MousePressed[1] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0;
     io.MouseDown[2] = g_MousePressed[2] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0;
     g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false;
-    g_MouseWheel = 0.0f;
 
     // We need to use SDL_CaptureMouse() to easily retrieve mouse coordinates outside of the client area. This is only supported from SDL 2.0.4 (released Jan 2016)
 #if (SDL_MAJOR_VERSION >= 2) && (SDL_MINOR_VERSION >= 0) && (SDL_PATCHLEVEL >= 4)   

examples/vulkan_example/imgui_impl_glfw_vulkan.cpp

@@ -24,8 +24,7 @@
 // GLFW Data
 static GLFWwindow*  g_Window = NULL;
 static double       g_Time = 0.0f;
-static bool         g_MousePressed[3] = { false, false, false };
-static float        g_MouseWheel = 0.0f;
+static bool         g_MouseJustPressed[3] = { false, false, false };
 
 // Vulkan Data
 static VkAllocationCallbacks* g_Allocator = NULL;
@@ -327,12 +326,14 @@ static void ImGui_ImplGlfwVulkan_SetClipboardText(void* user_data, const char* t
 void ImGui_ImplGlfwVulkan_MouseButtonCallback(GLFWwindow*, int button, int action, int /*mods*/)
 {
     if (action == GLFW_PRESS && button >= 0 && button < 3)
-        g_MousePressed[button] = true;
+        g_MouseJustPressed[button] = true;
 }
 
-void ImGui_ImplGlfwVulkan_ScrollCallback(GLFWwindow*, double /*xoffset*/, double yoffset)
+void ImGui_ImplGlfwVulkan_ScrollCallback(GLFWwindow*, double xoffset, double yoffset)
 {
-    g_MouseWheel += (float)yoffset; // Use fractional mouse wheel.
+    ImGuiIO& io = ImGui::GetIO();
+    io.MouseWheelH += (float)xoffset;
+    io.MouseWheel += (float)yoffset;
 }
 
 void ImGui_ImplGlfwVulkan_KeyCallback(GLFWwindow*, int key, int, int action, int mods)
@@ -821,13 +822,10 @@ void ImGui_ImplGlfwVulkan_NewFrame()
 
     for (int i = 0; i < 3; i++)
     {
-        io.MouseDown[i] = g_MousePressed[i] || glfwGetMouseButton(g_Window, i) != 0;    // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
-        g_MousePressed[i] = false;
+        io.MouseDown[i] = g_MouseJustPressed[i] || glfwGetMouseButton(g_Window, i) != 0;    // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
+        g_MouseJustPressed[i] = false;
     }
 
-    io.MouseWheel = g_MouseWheel;
-    g_MouseWheel = 0.0f;
-
     // Hide OS mouse cursor if ImGui is drawing it
     glfwSetInputMode(g_Window, GLFW_CURSOR, io.MouseDrawCursor ? GLFW_CURSOR_HIDDEN : GLFW_CURSOR_NORMAL);
 

imgui.cpp

@@ -169,7 +169,7 @@
 
  - A minimal render function skeleton may be:
 
-    void void MyRenderFunction(ImDrawData* draw_data)(ImDrawData* draw_data)
+    void void MyRenderFunction(ImDrawData* draw_data)
     {
        // TODO: Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled
        // TODO: Setup viewport, orthographic projection matrix
@@ -3061,8 +3061,8 @@ void ImGui::NewFrame()
     // (We pass an error message in the assert expression as a trick to get it visible to programmers who are not using a debugger, as most assert handlers display their argument)
     IM_ASSERT(g.IO.DeltaTime >= 0.0f                                    && "Need a positive DeltaTime (zero is tolerated but will cause some timing issues)");
     IM_ASSERT(g.IO.DisplaySize.x >= 0.0f && g.IO.DisplaySize.y >= 0.0f  && "Invalid DisplaySize value");
-    IM_ASSERT(g.IO.Fonts->Fonts.Size > 0                                && "Font Atlas not created. Did you call io.Fonts->GetTexDataAsRGBA32 / GetTexDataAsAlpha8 ?");
-    IM_ASSERT(g.IO.Fonts->Fonts[0]->IsLoaded()                          && "Font Atlas not created. Did you call io.Fonts->GetTexDataAsRGBA32 / GetTexDataAsAlpha8 ?");
+    IM_ASSERT(g.IO.Fonts->Fonts.Size > 0                                && "Font Atlas not built. Did you call io.Fonts->GetTexDataAsRGBA32() / GetTexDataAsAlpha8() ?");
+    IM_ASSERT(g.IO.Fonts->Fonts[0]->IsLoaded()                          && "Font Atlas not built. Did you call io.Fonts->GetTexDataAsRGBA32() / GetTexDataAsAlpha8() ?");
     IM_ASSERT(g.Style.CurveTessellationTol > 0.0f                       && "Invalid style setting");
     IM_ASSERT(g.Style.Alpha >= 0.0f && g.Style.Alpha <= 1.0f            && "Invalid style setting. Alpha cannot be negative (allows us to avoid a few clamps in color computations)");
     IM_ASSERT((g.FrameCount == 0 || g.FrameCountEnded == g.FrameCount)  && "Forgot to call Render() or EndFrame() at the end of the previous frame?");
@@ -3277,38 +3277,46 @@ void ImGui::NewFrame()
     if (!mouse_avail_to_imgui && !mouse_dragging_extern_payload)
         g.HoveredWindow = g.HoveredRootWindow = NULL;
 
-    // Scale & Scrolling
-    if (g.HoveredWindow && g.IO.MouseWheel != 0.0f && !g.HoveredWindow->Collapsed)
+    // Mouse wheel scrolling, scale
+    if (g.HoveredWindow && !g.HoveredWindow->Collapsed && (g.IO.MouseWheel != 0.0f || g.IO.MouseWheelH != 0.0f))
     {
+        // If a child window has the ImGuiWindowFlags_NoScrollWithMouse flag, we give a chance to scroll its parent (unless either ImGuiWindowFlags_NoInputs or ImGuiWindowFlags_NoScrollbar are also set).
         ImGuiWindow* window = g.HoveredWindow;
-        if (g.IO.KeyCtrl && g.IO.FontAllowUserScaling)
-        {
-            // Zoom / Scale window
-            const float new_font_scale = ImClamp(window->FontWindowScale + g.IO.MouseWheel * 0.10f, 0.50f, 2.50f);
-            const float scale = new_font_scale / window->FontWindowScale;
-            window->FontWindowScale = new_font_scale;
+        ImGuiWindow* scroll_window = window;
+        while ((scroll_window->Flags & ImGuiWindowFlags_ChildWindow) && (scroll_window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(scroll_window->Flags & ImGuiWindowFlags_NoScrollbar) && !(scroll_window->Flags & ImGuiWindowFlags_NoInputs) && scroll_window->ParentWindow)
+            scroll_window = scroll_window->ParentWindow;
+        const bool scroll_allowed = !(scroll_window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(scroll_window->Flags & ImGuiWindowFlags_NoInputs);
 
-            const ImVec2 offset = window->Size * (1.0f - scale) * (g.IO.MousePos - window->Pos) / window->Size;
-            window->Pos += offset;
-            window->PosFloat += offset;
-            window->Size *= scale;
-            window->SizeFull *= scale;
-        }
-        else if (!g.IO.KeyCtrl)
+        if (g.IO.MouseWheel != 0.0f)
         {
-            // Mouse wheel Scrolling
-            // If a child window has the ImGuiWindowFlags_NoScrollWithMouse flag, we give a chance to scroll its parent (unless either ImGuiWindowFlags_NoInputs or ImGuiWindowFlags_NoScrollbar are also set).
-            ImGuiWindow* scroll_window = window;
-            while ((scroll_window->Flags & ImGuiWindowFlags_ChildWindow) && (scroll_window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(scroll_window->Flags & ImGuiWindowFlags_NoScrollbar) && !(scroll_window->Flags & ImGuiWindowFlags_NoInputs) && scroll_window->ParentWindow)
-                scroll_window = scroll_window->ParentWindow;
-
-            if (!(scroll_window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(scroll_window->Flags & ImGuiWindowFlags_NoInputs))
+            if (g.IO.KeyCtrl && g.IO.FontAllowUserScaling)
+            {
+                // Zoom / Scale window
+                const float new_font_scale = ImClamp(window->FontWindowScale + g.IO.MouseWheel * 0.10f, 0.50f, 2.50f);
+                const float scale = new_font_scale / window->FontWindowScale;
+                window->FontWindowScale = new_font_scale;
+
+                const ImVec2 offset = window->Size * (1.0f - scale) * (g.IO.MousePos - window->Pos) / window->Size;
+                window->Pos += offset;
+                window->PosFloat += offset;
+                window->Size *= scale;
+                window->SizeFull *= scale;
+            }
+            else if (!g.IO.KeyCtrl && scroll_allowed)
             {
+                // Mouse wheel vertical scrolling
                 float scroll_amount = 5 * scroll_window->CalcFontSize();
                 scroll_amount = (float)(int)ImMin(scroll_amount, (scroll_window->ContentsRegionRect.GetHeight() + scroll_window->WindowPadding.y * 2.0f) * 0.67f);
                 SetWindowScrollY(scroll_window, scroll_window->Scroll.y - g.IO.MouseWheel * scroll_amount);
             }
         }
+        if (g.IO.MouseWheelH != 0.0f && scroll_allowed)
+        {
+            // Mouse wheel horizontal scrolling (for hardware that supports it)
+            float scroll_amount = scroll_window->CalcFontSize();
+            if (!g.IO.KeyCtrl && !(window->Flags & ImGuiWindowFlags_NoScrollWithMouse))
+                SetWindowScrollX(window, window->Scroll.x - g.IO.MouseWheelH * scroll_amount);
+        }
     }
 
     // Pressing TAB activate widget focus
@@ -3839,7 +3847,7 @@ void ImGui::EndFrame()
     g.Windows.swap(g.WindowsSortBuffer);
 
     // Clear Input data for next frame
-    g.IO.MouseWheel = 0.0f;
+    g.IO.MouseWheel = g.IO.MouseWheelH = 0.0f;
     memset(g.IO.InputCharacters, 0, sizeof(g.IO.InputCharacters));
 
     g.FrameCountEnded = g.FrameCount;
@@ -3872,17 +3880,16 @@ void ImGui::Render()
         g.DrawDataBuilder.FlattenIntoSingleLayer();
 
         // Draw software mouse cursor if requested
-        if (g.IO.MouseDrawCursor)
+        ImVec2 offset, size, uv[4];
+        if (g.IO.MouseDrawCursor && g.IO.Fonts->GetMouseCursorTexData(g.MouseCursor, &offset, &size, &uv[0], &uv[2]))
         {
-            const ImGuiMouseCursorData& cursor_data = g.MouseCursorData[g.MouseCursor];
-            const ImVec2 pos = g.IO.MousePos - cursor_data.HotOffset;
-            const ImVec2 size = cursor_data.Size;
+            const ImVec2 pos = g.IO.MousePos - offset;
             const ImTextureID tex_id = g.IO.Fonts->TexID;
             g.OverlayDrawList.PushTextureID(tex_id);
-            g.OverlayDrawList.AddImage(tex_id, pos+ImVec2(1,0), pos+ImVec2(1,0) + size, cursor_data.TexUvMin[1], cursor_data.TexUvMax[1], IM_COL32(0,0,0,48));        // Shadow
-            g.OverlayDrawList.AddImage(tex_id, pos+ImVec2(2,0), pos+ImVec2(2,0) + size, cursor_data.TexUvMin[1], cursor_data.TexUvMax[1], IM_COL32(0,0,0,48));        // Shadow
-            g.OverlayDrawList.AddImage(tex_id, pos,             pos + size,             cursor_data.TexUvMin[1], cursor_data.TexUvMax[1], IM_COL32(0,0,0,255));       // Black border
-            g.OverlayDrawList.AddImage(tex_id, pos,             pos + size,             cursor_data.TexUvMin[0], cursor_data.TexUvMax[0], IM_COL32(255,255,255,255)); // White fill
+            g.OverlayDrawList.AddImage(tex_id, pos+ImVec2(1,0), pos+ImVec2(1,0) + size, uv[2], uv[3], IM_COL32(0,0,0,48));        // Shadow
+            g.OverlayDrawList.AddImage(tex_id, pos+ImVec2(2,0), pos+ImVec2(2,0) + size, uv[2], uv[3], IM_COL32(0,0,0,48));        // Shadow
+            g.OverlayDrawList.AddImage(tex_id, pos,             pos + size,             uv[2], uv[3], IM_COL32(0,0,0,255));       // Black border
+            g.OverlayDrawList.AddImage(tex_id, pos,             pos + size,             uv[0], uv[1], IM_COL32(255,255,255,255)); // White fill
             g.OverlayDrawList.PopTextureID();
         }
         if (!g.OverlayDrawList.VtxBuffer.empty())
@@ -4345,9 +4352,7 @@ bool ImGui::IsKeyReleased(int user_key_index)
     ImGuiContext& g = *GImGui;
     if (user_key_index < 0) return false;
     IM_ASSERT(user_key_index >= 0 && user_key_index < IM_ARRAYSIZE(g.IO.KeysDown));
-    if (g.IO.KeysDownDurationPrev[user_key_index] >= 0.0f && !g.IO.KeysDown[user_key_index])
-        return true;
-    return false;
+    return g.IO.KeysDownDurationPrev[user_key_index] >= 0.0f && !g.IO.KeysDown[user_key_index];
 }
 
 bool ImGui::IsMouseDown(int button)
@@ -5476,12 +5481,12 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
     // When reusing window again multiple times a frame, just append content (don't need to setup again)
     if (first_begin_of_the_frame)
     {
-        const bool is_pinned_child_tooltip = (flags & ImGuiWindowFlags_ChildWindow) && (flags & ImGuiWindowFlags_Tooltip); // FIXME-WIP: Undocumented behavior of Child+Tooltip for pinned tooltip (#1345)
+        const bool window_is_child_tooltip = (flags & ImGuiWindowFlags_ChildWindow) && (flags & ImGuiWindowFlags_Tooltip); // FIXME-WIP: Undocumented behavior of Child+Tooltip for pinned tooltip (#1345)
 
         // Initialize
         window->ParentWindow = parent_window;
         window->RootWindow = window->RootNonPopupWindow = window;
-        if (parent_window && (flags & ImGuiWindowFlags_ChildWindow) && !is_pinned_child_tooltip)
+        if (parent_window && (flags & ImGuiWindowFlags_ChildWindow) && !window_is_child_tooltip)
             window->RootWindow = parent_window->RootWindow;
         if (parent_window && !(flags & ImGuiWindowFlags_Modal) && (flags & (ImGuiWindowFlags_ChildWindow | ImGuiWindowFlags_Popup)))
             window->RootNonPopupWindow = parent_window->RootNonPopupWindow;
@@ -5600,7 +5605,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         {
             window->BeginOrderWithinParent = parent_window->DC.ChildWindows.Size;
             parent_window->DC.ChildWindows.push_back(window);
-            if (!(flags & ImGuiWindowFlags_Popup) && !window_pos_set_by_api && !is_pinned_child_tooltip)
+            if (!(flags & ImGuiWindowFlags_Popup) && !window_pos_set_by_api && !window_is_child_tooltip)
                 window->Pos = window->PosFloat = parent_window->DC.CursorPos;
         }
 
@@ -5631,7 +5636,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         }
 
         // Position tooltip (always follows mouse)
-        if ((flags & ImGuiWindowFlags_Tooltip) != 0 && !window_pos_set_by_api && !is_pinned_child_tooltip)
+        if ((flags & ImGuiWindowFlags_Tooltip) != 0 && !window_pos_set_by_api && !window_is_child_tooltip)
         {
             ImVec2 ref_pos = (!g.NavDisableHighlight && g.NavDisableMouseHover) ? NavCalcPreferredMousePos() : g.IO.MousePos;
             ImRect rect_to_avoid(ref_pos.x - 16, ref_pos.y - 8, ref_pos.x + 24, ref_pos.y + 24); // FIXME: Completely hard-coded. Store boxes in mouse cursor data? Scale? Center on cursor hit-point?
@@ -5689,7 +5694,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         window->DrawList->Flags = (g.Style.AntiAliasedLines ? ImDrawListFlags_AntiAliasedLines : 0) | (g.Style.AntiAliasedFill ? ImDrawListFlags_AntiAliasedFill : 0);
         window->DrawList->PushTextureID(g.Font->ContainerAtlas->TexID);
         ImRect fullscreen_rect(GetVisibleRect());
-        if ((flags & ImGuiWindowFlags_ChildWindow) && !(flags & ImGuiWindowFlags_Popup) && !is_pinned_child_tooltip)
+        if ((flags & ImGuiWindowFlags_ChildWindow) && !(flags & ImGuiWindowFlags_Popup) && !window_is_child_tooltip)
             PushClipRect(parent_window->ClipRect.Min, parent_window->ClipRect.Max, true);
         else
             PushClipRect(fullscreen_rect.Min, fullscreen_rect.Max, true);

imgui.h

@@ -966,7 +966,8 @@ struct ImGuiIO
 
     ImVec2      MousePos;                   // Mouse position, in pixels. Set to ImVec2(-FLT_MAX,-FLT_MAX) if mouse is unavailable (on another screen, etc.)
     bool        MouseDown[5];               // Mouse buttons: left, right, middle + extras. ImGui itself mostly only uses left button (BeginPopupContext** are using right button). Others buttons allows us to track if the mouse is being used by your application + available to user as a convenience via IsMouse** API.
-    float       MouseWheel;                 // Mouse wheel: 1 unit scrolls about 5 lines text.
+    float       MouseWheel;                 // Mouse wheel: 1 unit scrolls about 5 lines text. 
+    float       MouseWheelH;                // Mouse wheel (Horizontal). Most users don't have a mouse with an horizontal wheel, may not be filled by all back ends.
     bool        MouseDrawCursor;            // Request ImGui to draw a mouse cursor for you (if you are on a platform without a mouse cursor).
     bool        KeyCtrl;                    // Keyboard modifier pressed: Control
     bool        KeyShift;                   // Keyboard modifier pressed: Shift
@@ -1651,9 +1652,12 @@ struct ImFontAtlas
 
     IMGUI_API int       AddCustomRectRegular(unsigned int id, int width, int height);                                                                   // Id needs to be >= 0x10000. Id >= 0x80000000 are reserved for ImGui and ImDrawList
     IMGUI_API int       AddCustomRectFontGlyph(ImFont* font, ImWchar id, int width, int height, float advance_x, const ImVec2& offset = ImVec2(0,0));   // Id needs to be < 0x10000 to register a rectangle to map into a specific font.
-    IMGUI_API void      CalcCustomRectUV(const CustomRect* rect, ImVec2* out_uv_min, ImVec2* out_uv_max);
     const CustomRect*   GetCustomRectByIndex(int index) const { if (index < 0) return NULL; return &CustomRects[index]; }
 
+    // Internals
+    IMGUI_API void      CalcCustomRectUV(const CustomRect* rect, ImVec2* out_uv_min, ImVec2* out_uv_max);
+    IMGUI_API bool      GetMouseCursorTexData(ImGuiMouseCursor cursor, ImVec2* out_offset, ImVec2* out_size, ImVec2 out_uv_border[2], ImVec2 out_uv_fill[2]);
+
     //-------------------------------------------
     // Members
     //-------------------------------------------
@@ -1668,6 +1672,7 @@ struct ImFontAtlas
     unsigned int*               TexPixelsRGBA32;    // 4 component per pixel, each component is unsigned 8-bit. Total size = TexWidth * TexHeight * 4
     int                         TexWidth;           // Texture width calculated during Build().
     int                         TexHeight;          // Texture height calculated during Build().
+    ImVec2                      TexUvScale;         // = (1.0f/TexWidth, 1.0f/TexHeight)
     ImVec2                      TexUvWhitePixel;    // Texture coordinates to a white pixel
     ImVector<ImFont*>           Fonts;              // Hold all the fonts returned by AddFont*. Fonts[0] is the default font upon calling ImGui::NewFrame(), use ImGui::PushFont()/PopFont() to change the current font.
     ImVector<CustomRect>        CustomRects;        // Rectangles for packing custom texture data into the atlas.

imgui_draw.cpp

@@ -1358,7 +1358,6 @@ static const ImVec2 FONT_ATLAS_DEFAULT_TEX_CURSOR_DATA[ImGuiMouseCursor_Count_][
     { ImVec2(55,0), ImVec2(17,17), ImVec2( 9, 9) }, // ImGuiMouseCursor_ResizeNWSE
 };
 
-
 ImFontAtlas::ImFontAtlas()
 {
     TexID = NULL;
@@ -1367,7 +1366,8 @@ ImFontAtlas::ImFontAtlas()
     TexPixelsAlpha8 = NULL;
     TexPixelsRGBA32 = NULL;
     TexWidth = TexHeight = 0;
-    TexUvWhitePixel = ImVec2(0, 0);
+    TexUvScale = ImVec2(0.0f, 0.0f);
+    TexUvWhitePixel = ImVec2(0.0f, 0.0f);
     for (int n = 0; n < IM_ARRAYSIZE(CustomRectIds); n++)
         CustomRectIds[n] = -1;
 }
@@ -1611,8 +1611,27 @@ void ImFontAtlas::CalcCustomRectUV(const CustomRect* rect, ImVec2* out_uv_min, I
 {
     IM_ASSERT(TexWidth > 0 && TexHeight > 0);   // Font atlas needs to be built before we can calculate UV coordinates
     IM_ASSERT(rect->IsPacked());                // Make sure the rectangle has been packed
-    *out_uv_min = ImVec2((float)rect->X / TexWidth, (float)rect->Y / TexHeight);
-    *out_uv_max = ImVec2((float)(rect->X + rect->Width) / TexWidth, (float)(rect->Y + rect->Height) / TexHeight);
+    *out_uv_min = ImVec2((float)rect->X * TexUvScale.x, (float)rect->Y * TexUvScale.y);
+    *out_uv_max = ImVec2((float)(rect->X + rect->Width) * TexUvScale.x, (float)(rect->Y + rect->Height) * TexUvScale.y);
+}
+
+bool ImFontAtlas::GetMouseCursorTexData(ImGuiMouseCursor cursor_type, ImVec2* out_offset, ImVec2* out_size, ImVec2 out_uv_border[2], ImVec2 out_uv_fill[2])
+{
+    if (cursor_type <= ImGuiMouseCursor_None || cursor_type >= ImGuiMouseCursor_Count_)
+        return false;
+
+    ImFontAtlas::CustomRect& r = CustomRects[CustomRectIds[0]];
+    IM_ASSERT(r.ID == FONT_ATLAS_DEFAULT_TEX_DATA_ID);
+    ImVec2 pos = FONT_ATLAS_DEFAULT_TEX_CURSOR_DATA[cursor_type][0] + ImVec2((float)r.X, (float)r.Y);
+    ImVec2 size = FONT_ATLAS_DEFAULT_TEX_CURSOR_DATA[cursor_type][1];
+    *out_size = size;
+    *out_offset = FONT_ATLAS_DEFAULT_TEX_CURSOR_DATA[cursor_type][2];
+    out_uv_border[0] = (pos) * TexUvScale;
+    out_uv_border[1] = (pos + size) * TexUvScale;
+    pos.x += FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF + 1;
+    out_uv_fill[0] = (pos) * TexUvScale;
+    out_uv_fill[1] = (pos + size) * TexUvScale;
+    return true;
 }
 
 bool    ImFontAtlas::Build()
@@ -1645,7 +1664,8 @@ bool    ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
 
     atlas->TexID = NULL;
     atlas->TexWidth = atlas->TexHeight = 0;
-    atlas->TexUvWhitePixel = ImVec2(0, 0);
+    atlas->TexUvScale = ImVec2(0.0f, 0.0f);
+    atlas->TexUvWhitePixel = ImVec2(0.0f, 0.0f);
     atlas->ClearTexData();
 
     // Count glyphs/ranges
@@ -1754,6 +1774,7 @@ bool    ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
 
     // Create texture
     atlas->TexHeight = ImUpperPowerOfTwo(atlas->TexHeight);
+    atlas->TexUvScale = ImVec2(1.0f / atlas->TexWidth, 1.0f / atlas->TexHeight);
     atlas->TexPixelsAlpha8 = (unsigned char*)ImGui::MemAlloc(atlas->TexWidth * atlas->TexHeight);
     memset(atlas->TexPixelsAlpha8, 0, atlas->TexWidth * atlas->TexHeight);
     spc.pixels = atlas->TexPixelsAlpha8;
@@ -1895,24 +1916,7 @@ static void ImFontAtlasBuildRenderDefaultTexData(ImFontAtlas* atlas)
             atlas->TexPixelsAlpha8[offset0] = FONT_ATLAS_DEFAULT_TEX_DATA_PIXELS[n] == '.' ? 0xFF : 0x00;
             atlas->TexPixelsAlpha8[offset1] = FONT_ATLAS_DEFAULT_TEX_DATA_PIXELS[n] == 'X' ? 0xFF : 0x00;
         }
-    const ImVec2 tex_uv_scale(1.0f / atlas->TexWidth, 1.0f / atlas->TexHeight);
-    atlas->TexUvWhitePixel = ImVec2((r.X + 0.5f) * tex_uv_scale.x, (r.Y + 0.5f) * tex_uv_scale.y);
-
-    // Setup mouse cursors
-    for (int type = 0; type < ImGuiMouseCursor_Count_; type++)
-    {
-        ImGuiMouseCursorData& cursor_data = GImGui->MouseCursorData[type];
-        ImVec2 pos = FONT_ATLAS_DEFAULT_TEX_CURSOR_DATA[type][0] + ImVec2((float)r.X, (float)r.Y);
-        const ImVec2 size = FONT_ATLAS_DEFAULT_TEX_CURSOR_DATA[type][1];
-        cursor_data.Type = type;
-        cursor_data.Size = size;
-        cursor_data.HotOffset = FONT_ATLAS_DEFAULT_TEX_CURSOR_DATA[type][2];
-        cursor_data.TexUvMin[0] = (pos) * tex_uv_scale;
-        cursor_data.TexUvMax[0] = (pos + size) * tex_uv_scale;
-        pos.x += FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF + 1;
-        cursor_data.TexUvMin[1] = (pos) * tex_uv_scale;
-        cursor_data.TexUvMax[1] = (pos + size) * tex_uv_scale;
-    }
+    atlas->TexUvWhitePixel = ImVec2((r.X + 0.5f) * atlas->TexUvScale.x, (r.Y + 0.5f) * atlas->TexUvScale.y);
 }
 
 void ImFontAtlasBuildFinish(ImFontAtlas* atlas)

imgui_internal.h

@@ -39,7 +39,6 @@ struct ImGuiGroupData;
 struct ImGuiMenuColumns;
 struct ImGuiDrawContext;
 struct ImGuiTextEditState;
-struct ImGuiMouseCursorData;
 struct ImGuiPopupRef;
 struct ImGuiWindow;
 struct ImGuiWindowSettings;
@@ -400,16 +399,6 @@ struct ImGuiSettingsHandler
     ImGuiSettingsHandler() { memset(this, 0, sizeof(*this)); }
 };
 
-// Mouse cursor data (used when io.MouseDrawCursor is set)
-struct ImGuiMouseCursorData
-{
-    ImGuiMouseCursor    Type;
-    ImVec2              HotOffset;
-    ImVec2              Size;
-    ImVec2              TexUvMin[2];
-    ImVec2              TexUvMax[2];
-};
-
 // Storage for current popup stack
 struct ImGuiPopupRef
 {
@@ -612,7 +601,6 @@ struct ImGuiContext
     float                   ModalWindowDarkeningRatio;
     ImDrawList              OverlayDrawList;                    // Optional software render of mouse cursors, if io.MouseDrawCursor is set + a few debug overlays
     ImGuiMouseCursor        MouseCursor;
-    ImGuiMouseCursorData    MouseCursorData[ImGuiMouseCursor_Count_];
 
     // Drag and Drop
     bool                    DragDropActive;
@@ -726,7 +714,6 @@ struct ImGuiContext
         OverlayDrawList._Data = &DrawListSharedData;
         OverlayDrawList._OwnerName = "##Overlay"; // Give it a name for debugging
         MouseCursor = ImGuiMouseCursor_Arrow;
-        memset(MouseCursorData, 0, sizeof(MouseCursorData));
 
         DragDropActive = false;
         DragDropSourceFlags = 0;