558 lines
27 KiB
C++
558 lines
27 KiB
C++
// dear imgui: Platform Backend for Windows (standard windows API for 32 and 64 bits applications)
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// This needs to be used along with a Renderer (e.g. DirectX11, OpenGL3, Vulkan..)
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// Implemented features:
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// [X] Platform: Clipboard support (for Win32 this is actually part of core dear imgui)
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// [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
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// [X] Platform: Keyboard arrays indexed using VK_* Virtual Key Codes, e.g. ImGui::IsKeyPressed(VK_SPACE).
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// [X] Platform: Gamepad support. Enabled with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
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// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
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// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
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// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
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// Read online: https://github.com/ocornut/imgui/tree/master/docs
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#include "imgui.h"
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#include "imgui_impl_win32.h"
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#endif
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#include <windows.h>
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#include <tchar.h>
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#include <dwmapi.h>
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// Configuration flags to add in your imconfig.h file:
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//#define IMGUI_IMPL_WIN32_DISABLE_GAMEPAD // Disable gamepad support. This was meaningful before <1.81 but we now load XInput dynamically so the option is now less relevant.
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// Using XInput for gamepad (will load DLL dynamically)
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#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
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#include <xinput.h>
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typedef DWORD (WINAPI *PFN_XInputGetCapabilities)(DWORD, DWORD, XINPUT_CAPABILITIES*);
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typedef DWORD (WINAPI *PFN_XInputGetState)(DWORD, XINPUT_STATE*);
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#endif
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// CHANGELOG
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// (minor and older changes stripped away, please see git history for details)
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// 2021-06-08: Fix ImGui_ImplWin32_EnableDpiAwareness() and ImGui_ImplWin32_GetDpiScaleForMonitor() to handle Windows 8.1/10 features without a manifest (per-monitor DPI, and properly calls SetProcessDpiAwareness() on 8.1).
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// 2021-03-23: Inputs: Clearing keyboard down array when losing focus (WM_KILLFOCUS).
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// 2021-02-18: Added ImGui_ImplWin32_EnableAlphaCompositing(). Non Visual Studio users will need to link with dwmapi.lib (MinGW/gcc: use -ldwmapi).
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// 2021-02-17: Fixed ImGui_ImplWin32_EnableDpiAwareness() attempting to get SetProcessDpiAwareness from shcore.dll on Windows 8 whereas it is only supported on Windows 8.1.
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// 2021-01-25: Inputs: Dynamically loading XInput DLL.
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// 2020-12-04: Misc: Fixed setting of io.DisplaySize to invalid/uninitialized data when after hwnd has been closed.
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// 2020-03-03: Inputs: Calling AddInputCharacterUTF16() to support surrogate pairs leading to codepoint >= 0x10000 (for more complete CJK inputs)
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// 2020-02-17: Added ImGui_ImplWin32_EnableDpiAwareness(), ImGui_ImplWin32_GetDpiScaleForHwnd(), ImGui_ImplWin32_GetDpiScaleForMonitor() helper functions.
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// 2020-01-14: Inputs: Added support for #define IMGUI_IMPL_WIN32_DISABLE_GAMEPAD/IMGUI_IMPL_WIN32_DISABLE_LINKING_XINPUT.
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// 2019-12-05: Inputs: Added support for ImGuiMouseCursor_NotAllowed mouse cursor.
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// 2019-05-11: Inputs: Don't filter value from WM_CHAR before calling AddInputCharacter().
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// 2019-01-17: Misc: Using GetForegroundWindow()+IsChild() instead of GetActiveWindow() to be compatible with windows created in a different thread or parent.
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// 2019-01-17: Inputs: Added support for mouse buttons 4 and 5 via WM_XBUTTON* messages.
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// 2019-01-15: Inputs: Added support for XInput gamepads (if ImGuiConfigFlags_NavEnableGamepad is set by user application).
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// 2018-11-30: Misc: Setting up io.BackendPlatformName so it can be displayed in the About Window.
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// 2018-06-29: Inputs: Added support for the ImGuiMouseCursor_Hand cursor.
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// 2018-06-10: Inputs: Fixed handling of mouse wheel messages to support fine position messages (typically sent by track-pads).
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// 2018-06-08: Misc: Extracted imgui_impl_win32.cpp/.h away from the old combined DX9/DX10/DX11/DX12 examples.
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// 2018-03-20: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors and ImGuiBackendFlags_HasSetMousePos flags + honor ImGuiConfigFlags_NoMouseCursorChange flag.
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// 2018-02-20: Inputs: Added support for mouse cursors (ImGui::GetMouseCursor() value and WM_SETCURSOR message handling).
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// 2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
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// 2018-02-06: Inputs: Honoring the io.WantSetMousePos by repositioning the mouse (when using navigation and ImGuiConfigFlags_NavMoveMouse is set).
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// 2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
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// 2018-01-20: Inputs: Added Horizontal Mouse Wheel support.
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// 2018-01-08: Inputs: Added mapping for ImGuiKey_Insert.
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// 2018-01-05: Inputs: Added WM_LBUTTONDBLCLK double-click handlers for window classes with the CS_DBLCLKS flag.
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// 2017-10-23: Inputs: Added WM_SYSKEYDOWN / WM_SYSKEYUP handlers so e.g. the VK_MENU key can be read.
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// 2017-10-23: Inputs: Using Win32 ::SetCapture/::GetCapture() to retrieve mouse positions outside the client area when dragging.
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// 2016-11-12: Inputs: Only call Win32 ::SetCursor(NULL) when io.MouseDrawCursor is set.
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// Win32 Data
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static HWND g_hWnd = NULL;
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static INT64 g_Time = 0;
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static INT64 g_TicksPerSecond = 0;
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static ImGuiMouseCursor g_LastMouseCursor = ImGuiMouseCursor_COUNT;
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static bool g_HasGamepad = false;
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static bool g_WantUpdateHasGamepad = true;
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// XInput DLL and functions
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#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
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static HMODULE g_XInputDLL = NULL;
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static PFN_XInputGetCapabilities g_XInputGetCapabilities = NULL;
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static PFN_XInputGetState g_XInputGetState = NULL;
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#endif
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// Functions
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bool ImGui_ImplWin32_Init(void* hwnd)
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{
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if (!::QueryPerformanceFrequency((LARGE_INTEGER*)&g_TicksPerSecond))
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return false;
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if (!::QueryPerformanceCounter((LARGE_INTEGER*)&g_Time))
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return false;
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// Setup backend capabilities flags
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g_hWnd = (HWND)hwnd;
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ImGuiIO& io = ImGui::GetIO();
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io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors; // We can honor GetMouseCursor() values (optional)
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io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos; // We can honor io.WantSetMousePos requests (optional, rarely used)
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io.BackendPlatformName = "imgui_impl_win32";
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io.ImeWindowHandle = hwnd;
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// Keyboard mapping. Dear ImGui will use those indices to peek into the io.KeysDown[] array that we will update during the application lifetime.
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io.KeyMap[ImGuiKey_Tab] = VK_TAB;
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io.KeyMap[ImGuiKey_LeftArrow] = VK_LEFT;
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io.KeyMap[ImGuiKey_RightArrow] = VK_RIGHT;
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io.KeyMap[ImGuiKey_UpArrow] = VK_UP;
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io.KeyMap[ImGuiKey_DownArrow] = VK_DOWN;
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io.KeyMap[ImGuiKey_PageUp] = VK_PRIOR;
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io.KeyMap[ImGuiKey_PageDown] = VK_NEXT;
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io.KeyMap[ImGuiKey_Home] = VK_HOME;
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io.KeyMap[ImGuiKey_End] = VK_END;
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io.KeyMap[ImGuiKey_Insert] = VK_INSERT;
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io.KeyMap[ImGuiKey_Delete] = VK_DELETE;
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io.KeyMap[ImGuiKey_Backspace] = VK_BACK;
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io.KeyMap[ImGuiKey_Space] = VK_SPACE;
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io.KeyMap[ImGuiKey_Enter] = VK_RETURN;
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io.KeyMap[ImGuiKey_Escape] = VK_ESCAPE;
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io.KeyMap[ImGuiKey_KeyPadEnter] = VK_RETURN;
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io.KeyMap[ImGuiKey_A] = 'A';
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io.KeyMap[ImGuiKey_C] = 'C';
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io.KeyMap[ImGuiKey_V] = 'V';
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io.KeyMap[ImGuiKey_X] = 'X';
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io.KeyMap[ImGuiKey_Y] = 'Y';
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io.KeyMap[ImGuiKey_Z] = 'Z';
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// Dynamically load XInput library
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#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
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const char* xinput_dll_names[] =
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{
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"xinput1_4.dll", // Windows 8+
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"xinput1_3.dll", // DirectX SDK
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"xinput9_1_0.dll", // Windows Vista, Windows 7
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"xinput1_2.dll", // DirectX SDK
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"xinput1_1.dll" // DirectX SDK
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};
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for (int n = 0; n < IM_ARRAYSIZE(xinput_dll_names); n++)
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if (HMODULE dll = ::LoadLibraryA(xinput_dll_names[n]))
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{
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g_XInputDLL = dll;
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g_XInputGetCapabilities = (PFN_XInputGetCapabilities)::GetProcAddress(dll, "XInputGetCapabilities");
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g_XInputGetState = (PFN_XInputGetState)::GetProcAddress(dll, "XInputGetState");
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break;
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}
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#endif // IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
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return true;
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}
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void ImGui_ImplWin32_Shutdown()
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{
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// Unload XInput library
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#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
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if (g_XInputDLL)
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::FreeLibrary(g_XInputDLL);
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g_XInputDLL = NULL;
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g_XInputGetCapabilities = NULL;
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g_XInputGetState = NULL;
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#endif // IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
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g_hWnd = NULL;
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g_Time = 0;
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g_TicksPerSecond = 0;
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g_LastMouseCursor = ImGuiMouseCursor_COUNT;
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g_HasGamepad = false;
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g_WantUpdateHasGamepad = true;
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}
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static bool ImGui_ImplWin32_UpdateMouseCursor()
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{
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ImGuiIO& io = ImGui::GetIO();
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if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange)
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return false;
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ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor();
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if (imgui_cursor == ImGuiMouseCursor_None || io.MouseDrawCursor)
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{
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// Hide OS mouse cursor if imgui is drawing it or if it wants no cursor
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::SetCursor(NULL);
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}
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else
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{
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// Show OS mouse cursor
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LPTSTR win32_cursor = IDC_ARROW;
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switch (imgui_cursor)
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{
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case ImGuiMouseCursor_Arrow: win32_cursor = IDC_ARROW; break;
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case ImGuiMouseCursor_TextInput: win32_cursor = IDC_IBEAM; break;
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case ImGuiMouseCursor_ResizeAll: win32_cursor = IDC_SIZEALL; break;
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case ImGuiMouseCursor_ResizeEW: win32_cursor = IDC_SIZEWE; break;
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case ImGuiMouseCursor_ResizeNS: win32_cursor = IDC_SIZENS; break;
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case ImGuiMouseCursor_ResizeNESW: win32_cursor = IDC_SIZENESW; break;
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case ImGuiMouseCursor_ResizeNWSE: win32_cursor = IDC_SIZENWSE; break;
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case ImGuiMouseCursor_Hand: win32_cursor = IDC_HAND; break;
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case ImGuiMouseCursor_NotAllowed: win32_cursor = IDC_NO; break;
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}
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::SetCursor(::LoadCursor(NULL, win32_cursor));
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}
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return true;
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}
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static void ImGui_ImplWin32_UpdateMousePos()
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{
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ImGuiIO& io = ImGui::GetIO();
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IM_ASSERT(g_hWnd != 0);
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// Set OS mouse position if requested (rarely used, only when ImGuiConfigFlags_NavEnableSetMousePos is enabled by user)
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if (io.WantSetMousePos)
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{
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POINT pos = { (int)io.MousePos.x, (int)io.MousePos.y };
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if (::ClientToScreen(g_hWnd, &pos))
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::SetCursorPos(pos.x, pos.y);
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}
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// Set mouse position
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io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
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POINT pos;
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if (HWND active_window = ::GetForegroundWindow())
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if (active_window == g_hWnd || ::IsChild(active_window, g_hWnd))
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if (::GetCursorPos(&pos) && ::ScreenToClient(g_hWnd, &pos))
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io.MousePos = ImVec2((float)pos.x, (float)pos.y);
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}
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// Gamepad navigation mapping
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static void ImGui_ImplWin32_UpdateGamepads()
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{
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#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
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ImGuiIO& io = ImGui::GetIO();
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memset(io.NavInputs, 0, sizeof(io.NavInputs));
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if ((io.ConfigFlags & ImGuiConfigFlags_NavEnableGamepad) == 0)
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return;
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// Calling XInputGetState() every frame on disconnected gamepads is unfortunately too slow.
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// Instead we refresh gamepad availability by calling XInputGetCapabilities() _only_ after receiving WM_DEVICECHANGE.
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if (g_WantUpdateHasGamepad)
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{
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XINPUT_CAPABILITIES caps;
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g_HasGamepad = g_XInputGetCapabilities ? (g_XInputGetCapabilities(0, XINPUT_FLAG_GAMEPAD, &caps) == ERROR_SUCCESS) : false;
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g_WantUpdateHasGamepad = false;
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}
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io.BackendFlags &= ~ImGuiBackendFlags_HasGamepad;
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XINPUT_STATE xinput_state;
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if (g_HasGamepad && g_XInputGetState && g_XInputGetState(0, &xinput_state) == ERROR_SUCCESS)
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{
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const XINPUT_GAMEPAD& gamepad = xinput_state.Gamepad;
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io.BackendFlags |= ImGuiBackendFlags_HasGamepad;
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#define MAP_BUTTON(NAV_NO, BUTTON_ENUM) { io.NavInputs[NAV_NO] = (gamepad.wButtons & BUTTON_ENUM) ? 1.0f : 0.0f; }
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#define MAP_ANALOG(NAV_NO, VALUE, V0, V1) { float vn = (float)(VALUE - V0) / (float)(V1 - V0); if (vn > 1.0f) vn = 1.0f; if (vn > 0.0f && io.NavInputs[NAV_NO] < vn) io.NavInputs[NAV_NO] = vn; }
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MAP_BUTTON(ImGuiNavInput_Activate, XINPUT_GAMEPAD_A); // Cross / A
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MAP_BUTTON(ImGuiNavInput_Cancel, XINPUT_GAMEPAD_B); // Circle / B
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MAP_BUTTON(ImGuiNavInput_Menu, XINPUT_GAMEPAD_X); // Square / X
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MAP_BUTTON(ImGuiNavInput_Input, XINPUT_GAMEPAD_Y); // Triangle / Y
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MAP_BUTTON(ImGuiNavInput_DpadLeft, XINPUT_GAMEPAD_DPAD_LEFT); // D-Pad Left
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MAP_BUTTON(ImGuiNavInput_DpadRight, XINPUT_GAMEPAD_DPAD_RIGHT); // D-Pad Right
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MAP_BUTTON(ImGuiNavInput_DpadUp, XINPUT_GAMEPAD_DPAD_UP); // D-Pad Up
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MAP_BUTTON(ImGuiNavInput_DpadDown, XINPUT_GAMEPAD_DPAD_DOWN); // D-Pad Down
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MAP_BUTTON(ImGuiNavInput_FocusPrev, XINPUT_GAMEPAD_LEFT_SHOULDER); // L1 / LB
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MAP_BUTTON(ImGuiNavInput_FocusNext, XINPUT_GAMEPAD_RIGHT_SHOULDER); // R1 / RB
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MAP_BUTTON(ImGuiNavInput_TweakSlow, XINPUT_GAMEPAD_LEFT_SHOULDER); // L1 / LB
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MAP_BUTTON(ImGuiNavInput_TweakFast, XINPUT_GAMEPAD_RIGHT_SHOULDER); // R1 / RB
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MAP_ANALOG(ImGuiNavInput_LStickLeft, gamepad.sThumbLX, -XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, -32768);
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MAP_ANALOG(ImGuiNavInput_LStickRight, gamepad.sThumbLX, +XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, +32767);
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MAP_ANALOG(ImGuiNavInput_LStickUp, gamepad.sThumbLY, +XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, +32767);
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MAP_ANALOG(ImGuiNavInput_LStickDown, gamepad.sThumbLY, -XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, -32767);
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#undef MAP_BUTTON
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#undef MAP_ANALOG
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}
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#endif // #ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
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}
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void ImGui_ImplWin32_NewFrame()
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{
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ImGuiIO& io = ImGui::GetIO();
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// Setup display size (every frame to accommodate for window resizing)
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RECT rect = { 0, 0, 0, 0 };
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::GetClientRect(g_hWnd, &rect);
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io.DisplaySize = ImVec2((float)(rect.right - rect.left), (float)(rect.bottom - rect.top));
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// Setup time step
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INT64 current_time = 0;
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::QueryPerformanceCounter((LARGE_INTEGER*)¤t_time);
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io.DeltaTime = (float)(current_time - g_Time) / g_TicksPerSecond;
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g_Time = current_time;
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// Read keyboard modifiers inputs
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io.KeyCtrl = (::GetKeyState(VK_CONTROL) & 0x8000) != 0;
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io.KeyShift = (::GetKeyState(VK_SHIFT) & 0x8000) != 0;
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io.KeyAlt = (::GetKeyState(VK_MENU) & 0x8000) != 0;
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io.KeySuper = false;
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// io.KeysDown[], io.MousePos, io.MouseDown[], io.MouseWheel: filled by the WndProc handler below.
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// Update OS mouse position
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ImGui_ImplWin32_UpdateMousePos();
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// Update OS mouse cursor with the cursor requested by imgui
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ImGuiMouseCursor mouse_cursor = io.MouseDrawCursor ? ImGuiMouseCursor_None : ImGui::GetMouseCursor();
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if (g_LastMouseCursor != mouse_cursor)
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{
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g_LastMouseCursor = mouse_cursor;
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ImGui_ImplWin32_UpdateMouseCursor();
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}
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// Update game controllers (if enabled and available)
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ImGui_ImplWin32_UpdateGamepads();
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}
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// Allow compilation with old Windows SDK. MinGW doesn't have default _WIN32_WINNT/WINVER versions.
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#ifndef WM_MOUSEHWHEEL
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#define WM_MOUSEHWHEEL 0x020E
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#endif
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#ifndef DBT_DEVNODES_CHANGED
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#define DBT_DEVNODES_CHANGED 0x0007
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#endif
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// Win32 message handler (process Win32 mouse/keyboard inputs, etc.)
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// Call from your application's message handler.
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// When implementing your own backend, you can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if Dear ImGui wants to use your inputs.
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// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
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// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
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// Generally you may always pass all inputs to Dear ImGui, and hide them from your application based on those two flags.
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// PS: In this Win32 handler, we use the capture API (GetCapture/SetCapture/ReleaseCapture) to be able to read mouse coordinates when dragging mouse outside of our window bounds.
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// PS: We treat DBLCLK messages as regular mouse down messages, so this code will work on windows classes that have the CS_DBLCLKS flag set. Our own example app code doesn't set this flag.
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#if 0
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// Copy this line into your .cpp file to forward declare the function.
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extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
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#endif
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IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
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{
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if (ImGui::GetCurrentContext() == NULL)
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return 0;
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ImGuiIO& io = ImGui::GetIO();
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switch (msg)
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{
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case WM_LBUTTONDOWN: case WM_LBUTTONDBLCLK:
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case WM_RBUTTONDOWN: case WM_RBUTTONDBLCLK:
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case WM_MBUTTONDOWN: case WM_MBUTTONDBLCLK:
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case WM_XBUTTONDOWN: case WM_XBUTTONDBLCLK:
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{
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int button = 0;
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if (msg == WM_LBUTTONDOWN || msg == WM_LBUTTONDBLCLK) { button = 0; }
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if (msg == WM_RBUTTONDOWN || msg == WM_RBUTTONDBLCLK) { button = 1; }
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if (msg == WM_MBUTTONDOWN || msg == WM_MBUTTONDBLCLK) { button = 2; }
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if (msg == WM_XBUTTONDOWN || msg == WM_XBUTTONDBLCLK) { button = (GET_XBUTTON_WPARAM(wParam) == XBUTTON1) ? 3 : 4; }
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if (!ImGui::IsAnyMouseDown() && ::GetCapture() == NULL)
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::SetCapture(hwnd);
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io.MouseDown[button] = true;
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return 0;
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}
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case WM_LBUTTONUP:
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case WM_RBUTTONUP:
|
|
case WM_MBUTTONUP:
|
|
case WM_XBUTTONUP:
|
|
{
|
|
int button = 0;
|
|
if (msg == WM_LBUTTONUP) { button = 0; }
|
|
if (msg == WM_RBUTTONUP) { button = 1; }
|
|
if (msg == WM_MBUTTONUP) { button = 2; }
|
|
if (msg == WM_XBUTTONUP) { button = (GET_XBUTTON_WPARAM(wParam) == XBUTTON1) ? 3 : 4; }
|
|
io.MouseDown[button] = false;
|
|
if (!ImGui::IsAnyMouseDown() && ::GetCapture() == hwnd)
|
|
::ReleaseCapture();
|
|
return 0;
|
|
}
|
|
case WM_MOUSEWHEEL:
|
|
io.MouseWheel += (float)GET_WHEEL_DELTA_WPARAM(wParam) / (float)WHEEL_DELTA;
|
|
return 0;
|
|
case WM_MOUSEHWHEEL:
|
|
io.MouseWheelH += (float)GET_WHEEL_DELTA_WPARAM(wParam) / (float)WHEEL_DELTA;
|
|
return 0;
|
|
case WM_KEYDOWN:
|
|
case WM_SYSKEYDOWN:
|
|
if (wParam < 256)
|
|
io.KeysDown[wParam] = 1;
|
|
return 0;
|
|
case WM_KEYUP:
|
|
case WM_SYSKEYUP:
|
|
if (wParam < 256)
|
|
io.KeysDown[wParam] = 0;
|
|
return 0;
|
|
case WM_KILLFOCUS:
|
|
memset(io.KeysDown, 0, sizeof(io.KeysDown));
|
|
return 0;
|
|
case WM_CHAR:
|
|
// You can also use ToAscii()+GetKeyboardState() to retrieve characters.
|
|
if (wParam > 0 && wParam < 0x10000)
|
|
io.AddInputCharacterUTF16((unsigned short)wParam);
|
|
return 0;
|
|
case WM_SETCURSOR:
|
|
if (LOWORD(lParam) == HTCLIENT && ImGui_ImplWin32_UpdateMouseCursor())
|
|
return 1;
|
|
return 0;
|
|
case WM_DEVICECHANGE:
|
|
if ((UINT)wParam == DBT_DEVNODES_CHANGED)
|
|
g_WantUpdateHasGamepad = true;
|
|
return 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
//--------------------------------------------------------------------------------------------------------
|
|
// DPI-related helpers (optional)
|
|
//--------------------------------------------------------------------------------------------------------
|
|
// - Use to enable DPI awareness without having to create an application manifest.
|
|
// - Your own app may already do this via a manifest or explicit calls. This is mostly useful for our examples/ apps.
|
|
// - In theory we could call simple functions from Windows SDK such as SetProcessDPIAware(), SetProcessDpiAwareness(), etc.
|
|
// but most of the functions provided by Microsoft require Windows 8.1/10+ SDK at compile time and Windows 8/10+ at runtime,
|
|
// neither we want to require the user to have. So we dynamically select and load those functions to avoid dependencies.
|
|
//---------------------------------------------------------------------------------------------------------
|
|
// This is the scheme successfully used by GLFW (from which we borrowed some of the code) and other apps aiming to be highly portable.
|
|
// ImGui_ImplWin32_EnableDpiAwareness() is just a helper called by main.cpp, we don't call it automatically.
|
|
// If you are trying to implement your own backend for your own engine, you may ignore that noise.
|
|
//---------------------------------------------------------------------------------------------------------
|
|
|
|
// Perform our own check with RtlVerifyVersionInfo() instead of using functions from <VersionHelpers.h> as they
|
|
// require a manifest to be functional for checks above 8.1. See https://github.com/ocornut/imgui/issues/4200
|
|
static BOOL _IsWindowsVersionOrGreater(WORD major, WORD minor, WORD)
|
|
{
|
|
typedef LONG(WINAPI* PFN_RtlVerifyVersionInfo)(OSVERSIONINFOEXW*, ULONG, ULONGLONG);
|
|
static PFN_RtlVerifyVersionInfo RtlVerifyVersionInfoFn = NULL;
|
|
if (RtlVerifyVersionInfoFn == NULL)
|
|
if (HMODULE ntdllModule = ::GetModuleHandleA("ntdll.dll"))
|
|
RtlVerifyVersionInfoFn = (PFN_RtlVerifyVersionInfo)GetProcAddress(ntdllModule, "RtlVerifyVersionInfo");
|
|
if (RtlVerifyVersionInfoFn == NULL)
|
|
return FALSE;
|
|
|
|
RTL_OSVERSIONINFOEXW versionInfo = { };
|
|
ULONGLONG conditionMask = 0;
|
|
versionInfo.dwOSVersionInfoSize = sizeof(RTL_OSVERSIONINFOEXW);
|
|
versionInfo.dwMajorVersion = major;
|
|
versionInfo.dwMinorVersion = minor;
|
|
VER_SET_CONDITION(conditionMask, VER_MAJORVERSION, VER_GREATER_EQUAL);
|
|
VER_SET_CONDITION(conditionMask, VER_MINORVERSION, VER_GREATER_EQUAL);
|
|
return (RtlVerifyVersionInfoFn(&versionInfo, VER_MAJORVERSION | VER_MINORVERSION, conditionMask) == 0) ? TRUE : FALSE;
|
|
}
|
|
|
|
#define _IsWindowsVistaOrGreater() _IsWindowsVersionOrGreater(HIBYTE(0x0600), LOBYTE(0x0600), 0) // _WIN32_WINNT_VISTA
|
|
#define _IsWindows8OrGreater() _IsWindowsVersionOrGreater(HIBYTE(0x0602), LOBYTE(0x0602), 0) // _WIN32_WINNT_WIN8
|
|
#define _IsWindows8Point1OrGreater() _IsWindowsVersionOrGreater(HIBYTE(0x0603), LOBYTE(0x0603), 0) // _WIN32_WINNT_WINBLUE
|
|
#define _IsWindows10OrGreater() _IsWindowsVersionOrGreater(HIBYTE(0x0A00), LOBYTE(0x0A00), 0) // _WIN32_WINNT_WINTHRESHOLD / _WIN32_WINNT_WIN10
|
|
|
|
#ifndef DPI_ENUMS_DECLARED
|
|
typedef enum { PROCESS_DPI_UNAWARE = 0, PROCESS_SYSTEM_DPI_AWARE = 1, PROCESS_PER_MONITOR_DPI_AWARE = 2 } PROCESS_DPI_AWARENESS;
|
|
typedef enum { MDT_EFFECTIVE_DPI = 0, MDT_ANGULAR_DPI = 1, MDT_RAW_DPI = 2, MDT_DEFAULT = MDT_EFFECTIVE_DPI } MONITOR_DPI_TYPE;
|
|
#endif
|
|
#ifndef _DPI_AWARENESS_CONTEXTS_
|
|
DECLARE_HANDLE(DPI_AWARENESS_CONTEXT);
|
|
#define DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE (DPI_AWARENESS_CONTEXT)-3
|
|
#endif
|
|
#ifndef DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2
|
|
#define DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 (DPI_AWARENESS_CONTEXT)-4
|
|
#endif
|
|
typedef HRESULT(WINAPI* PFN_SetProcessDpiAwareness)(PROCESS_DPI_AWARENESS); // Shcore.lib + dll, Windows 8.1+
|
|
typedef HRESULT(WINAPI* PFN_GetDpiForMonitor)(HMONITOR, MONITOR_DPI_TYPE, UINT*, UINT*); // Shcore.lib + dll, Windows 8.1+
|
|
typedef DPI_AWARENESS_CONTEXT(WINAPI* PFN_SetThreadDpiAwarenessContext)(DPI_AWARENESS_CONTEXT); // User32.lib + dll, Windows 10 v1607+ (Creators Update)
|
|
|
|
// Helper function to enable DPI awareness without setting up a manifest
|
|
void ImGui_ImplWin32_EnableDpiAwareness()
|
|
{
|
|
if (_IsWindows10OrGreater())
|
|
{
|
|
static HINSTANCE user32_dll = ::LoadLibraryA("user32.dll"); // Reference counted per-process
|
|
if (PFN_SetThreadDpiAwarenessContext SetThreadDpiAwarenessContextFn = (PFN_SetThreadDpiAwarenessContext)::GetProcAddress(user32_dll, "SetThreadDpiAwarenessContext"))
|
|
{
|
|
SetThreadDpiAwarenessContextFn(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
|
|
return;
|
|
}
|
|
}
|
|
if (_IsWindows8Point1OrGreater())
|
|
{
|
|
static HINSTANCE shcore_dll = ::LoadLibraryA("shcore.dll"); // Reference counted per-process
|
|
if (PFN_SetProcessDpiAwareness SetProcessDpiAwarenessFn = (PFN_SetProcessDpiAwareness)::GetProcAddress(shcore_dll, "SetProcessDpiAwareness"))
|
|
{
|
|
SetProcessDpiAwarenessFn(PROCESS_PER_MONITOR_DPI_AWARE);
|
|
return;
|
|
}
|
|
}
|
|
#if _WIN32_WINNT >= 0x0600
|
|
::SetProcessDPIAware();
|
|
#endif
|
|
}
|
|
|
|
#if defined(_MSC_VER) && !defined(NOGDI)
|
|
#pragma comment(lib, "gdi32") // Link with gdi32.lib for GetDeviceCaps(). MinGW will require linking with '-lgdi32'
|
|
#endif
|
|
|
|
float ImGui_ImplWin32_GetDpiScaleForMonitor(void* monitor)
|
|
{
|
|
UINT xdpi = 96, ydpi = 96;
|
|
if (_IsWindows8Point1OrGreater())
|
|
{
|
|
static HINSTANCE shcore_dll = ::LoadLibraryA("shcore.dll"); // Reference counted per-process
|
|
static PFN_GetDpiForMonitor GetDpiForMonitorFn = NULL;
|
|
if (GetDpiForMonitorFn == NULL && shcore_dll != NULL)
|
|
GetDpiForMonitorFn = (PFN_GetDpiForMonitor)::GetProcAddress(shcore_dll, "GetDpiForMonitor");
|
|
if (GetDpiForMonitorFn != NULL)
|
|
{
|
|
GetDpiForMonitorFn((HMONITOR)monitor, MDT_EFFECTIVE_DPI, &xdpi, &ydpi);
|
|
IM_ASSERT(xdpi == ydpi); // Please contact me if you hit this assert!
|
|
return xdpi / 96.0f;
|
|
}
|
|
}
|
|
#ifndef NOGDI
|
|
const HDC dc = ::GetDC(NULL);
|
|
xdpi = ::GetDeviceCaps(dc, LOGPIXELSX);
|
|
ydpi = ::GetDeviceCaps(dc, LOGPIXELSY);
|
|
IM_ASSERT(xdpi == ydpi); // Please contact me if you hit this assert!
|
|
::ReleaseDC(NULL, dc);
|
|
#endif
|
|
return xdpi / 96.0f;
|
|
}
|
|
|
|
float ImGui_ImplWin32_GetDpiScaleForHwnd(void* hwnd)
|
|
{
|
|
HMONITOR monitor = ::MonitorFromWindow((HWND)hwnd, MONITOR_DEFAULTTONEAREST);
|
|
return ImGui_ImplWin32_GetDpiScaleForMonitor(monitor);
|
|
}
|
|
|
|
//---------------------------------------------------------------------------------------------------------
|
|
// Transparency related helpers (optional)
|
|
//--------------------------------------------------------------------------------------------------------
|
|
|
|
#if defined(_MSC_VER)
|
|
#pragma comment(lib, "dwmapi") // Link with dwmapi.lib. MinGW will require linking with '-ldwmapi'
|
|
#endif
|
|
|
|
// [experimental]
|
|
// Borrowed from GLFW's function updateFramebufferTransparency() in src/win32_window.c
|
|
// (the Dwm* functions are Vista era functions but we are borrowing logic from GLFW)
|
|
void ImGui_ImplWin32_EnableAlphaCompositing(void* hwnd)
|
|
{
|
|
if (!_IsWindowsVistaOrGreater())
|
|
return;
|
|
|
|
BOOL composition;
|
|
if (FAILED(::DwmIsCompositionEnabled(&composition)) || !composition)
|
|
return;
|
|
|
|
BOOL opaque;
|
|
DWORD color;
|
|
if (_IsWindows8OrGreater() || (SUCCEEDED(::DwmGetColorizationColor(&color, &opaque)) && !opaque))
|
|
{
|
|
HRGN region = ::CreateRectRgn(0, 0, -1, -1);
|
|
DWM_BLURBEHIND bb = {};
|
|
bb.dwFlags = DWM_BB_ENABLE | DWM_BB_BLURREGION;
|
|
bb.hRgnBlur = region;
|
|
bb.fEnable = TRUE;
|
|
::DwmEnableBlurBehindWindow((HWND)hwnd, &bb);
|
|
::DeleteObject(region);
|
|
}
|
|
else
|
|
{
|
|
DWM_BLURBEHIND bb = {};
|
|
bb.dwFlags = DWM_BB_ENABLE;
|
|
::DwmEnableBlurBehindWindow((HWND)hwnd, &bb);
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------------------------------------------------------
|