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SDL_windowswindow.c
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SDL_windowswindow.c
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2024 Sam Lantinga <[email protected]>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_internal.h"
#ifdef SDL_VIDEO_DRIVER_WINDOWS
#include "../../core/windows/SDL_windows.h"
#include "../../SDL_hints_c.h"
#include "../../events/SDL_dropevents_c.h"
#include "../../events/SDL_keyboard_c.h"
#include "../../events/SDL_mouse_c.h"
#include "../../events/SDL_windowevents_c.h"
#include "../SDL_pixels_c.h"
#include "../SDL_sysvideo.h"
#include "SDL_windowsvideo.h"
#include "SDL_windowswindow.h"
// Dropfile support
#include <shellapi.h>
// DWM setting support
typedef HRESULT (WINAPI *DwmSetWindowAttribute_t)(HWND hwnd, DWORD dwAttribute, LPCVOID pvAttribute, DWORD cbAttribute);
typedef HRESULT (WINAPI *DwmGetWindowAttribute_t)(HWND hwnd, DWORD dwAttribute, PVOID pvAttribute, DWORD cbAttribute);
// Dark mode support
#ifndef DWMWA_USE_IMMERSIVE_DARK_MODE
#define DWMWA_USE_IMMERSIVE_DARK_MODE 20
#endif
// Corner rounding support (Win 11+)
#ifndef DWMWA_WINDOW_CORNER_PREFERENCE
#define DWMWA_WINDOW_CORNER_PREFERENCE 33
#endif
typedef enum {
DWMWCP_DEFAULT = 0,
DWMWCP_DONOTROUND = 1,
DWMWCP_ROUND = 2,
DWMWCP_ROUNDSMALL = 3
} DWM_WINDOW_CORNER_PREFERENCE;
// Border Color support (Win 11+)
#ifndef DWMWA_BORDER_COLOR
#define DWMWA_BORDER_COLOR 34
#endif
#ifndef DWMWA_COLOR_DEFAULT
#define DWMWA_COLOR_DEFAULT 0xFFFFFFFF
#endif
#ifndef DWMWA_COLOR_NONE
#define DWMWA_COLOR_NONE 0xFFFFFFFE
#endif
// Transparent window support
#ifndef DWM_BB_ENABLE
#define DWM_BB_ENABLE 0x00000001
#endif
#ifndef DWM_BB_BLURREGION
#define DWM_BB_BLURREGION 0x00000002
#endif
typedef struct
{
DWORD flags;
BOOL enable;
HRGN blur_region;
BOOL transition_on_maxed;
} DWM_BLURBEHIND;
typedef HRESULT(WINAPI *DwmEnableBlurBehindWindow_t)(HWND hwnd, const DWM_BLURBEHIND *pBlurBehind);
// Windows CE compatibility
#ifndef SWP_NOCOPYBITS
#define SWP_NOCOPYBITS 0
#endif
/* An undocumented message to create a popup system menu
* - wParam is always 0
* - lParam = MAKELONG(x, y) where x and y are the screen coordinates where the menu should be displayed
*/
#ifndef WM_POPUPSYSTEMMENU
#define WM_POPUPSYSTEMMENU 0x313
#endif
// #define HIGHDPI_DEBUG
// Fake window to help with DirectInput events.
HWND SDL_HelperWindow = NULL;
static const TCHAR *SDL_HelperWindowClassName = TEXT("SDLHelperWindowInputCatcher");
static const TCHAR *SDL_HelperWindowName = TEXT("SDLHelperWindowInputMsgWindow");
static ATOM SDL_HelperWindowClass = 0;
/* For borderless Windows, still want the following flag:
- WS_MINIMIZEBOX: window will respond to Windows minimize commands sent to all windows, such as windows key + m, shaking title bar, etc.
Additionally, non-fullscreen windows can add:
- WS_CAPTION: this seems to enable the Windows minimize animation
- WS_SYSMENU: enables system context menu on task bar
This will also cause the task bar to overlap the window and other windowed behaviors, so only use this for windows that shouldn't appear to be fullscreen
*/
#define STYLE_BASIC (WS_CLIPSIBLINGS | WS_CLIPCHILDREN)
#define STYLE_FULLSCREEN (WS_POPUP | WS_MINIMIZEBOX)
#define STYLE_BORDERLESS (WS_POPUP | WS_MINIMIZEBOX)
#define STYLE_BORDERLESS_WINDOWED (WS_POPUP | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX)
#define STYLE_NORMAL (WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX)
#define STYLE_RESIZABLE (WS_THICKFRAME | WS_MAXIMIZEBOX)
#define STYLE_MASK (STYLE_FULLSCREEN | STYLE_BORDERLESS | STYLE_NORMAL | STYLE_RESIZABLE)
static DWORD GetWindowStyle(SDL_Window *window)
{
DWORD style = 0;
if (SDL_WINDOW_IS_POPUP(window)) {
style |= WS_POPUP;
} else if (window->flags & SDL_WINDOW_FULLSCREEN) {
style |= STYLE_FULLSCREEN;
} else {
if (window->flags & SDL_WINDOW_BORDERLESS) {
/* This behavior more closely matches other platform where the window is borderless
but still interacts with the window manager (e.g. task bar shows above it, it can
be resized to fit within usable desktop area, etc.)
*/
if (SDL_GetHintBoolean("SDL_BORDERLESS_WINDOWED_STYLE", true)) {
style |= STYLE_BORDERLESS_WINDOWED;
} else {
style |= STYLE_BORDERLESS;
}
} else {
style |= STYLE_NORMAL;
}
if (window->flags & SDL_WINDOW_RESIZABLE) {
/* You can have a borderless resizable window, but Windows doesn't always draw it correctly,
see https://bugzilla.libsdl.org/show_bug.cgi?id=4466
*/
if (!(window->flags & SDL_WINDOW_BORDERLESS) ||
SDL_GetHintBoolean("SDL_BORDERLESS_RESIZABLE_STYLE", false)) {
style |= STYLE_RESIZABLE;
}
}
// Need to set initialize minimize style, or when we call ShowWindow with WS_MINIMIZE it will activate a random window
if (window->flags & SDL_WINDOW_MINIMIZED) {
style |= WS_MINIMIZE;
}
}
return style;
}
static DWORD GetWindowStyleEx(SDL_Window *window)
{
DWORD style = 0;
if (SDL_WINDOW_IS_POPUP(window) || (window->flags & SDL_WINDOW_UTILITY)) {
style |= WS_EX_TOOLWINDOW;
}
if (SDL_WINDOW_IS_POPUP(window) || (window->flags & SDL_WINDOW_NOT_FOCUSABLE)) {
style |= WS_EX_NOACTIVATE;
}
return style;
}
/**
* Returns arguments to pass to SetWindowPos - the window rect, including frame, in Windows coordinates.
* Can be called before we have a HWND.
*/
static bool WIN_AdjustWindowRectWithStyle(SDL_Window *window, DWORD style, DWORD styleEx, BOOL menu, int *x, int *y, int *width, int *height, SDL_WindowRect rect_type)
{
SDL_VideoData *videodata = SDL_GetVideoDevice() ? SDL_GetVideoDevice()->internal : NULL;
RECT rect;
// Client rect, in points
switch (rect_type) {
case SDL_WINDOWRECT_CURRENT:
SDL_RelativeToGlobalForWindow(window, window->x, window->y, x, y);
*width = window->w;
*height = window->h;
break;
case SDL_WINDOWRECT_WINDOWED:
SDL_RelativeToGlobalForWindow(window, window->windowed.x, window->windowed.y, x, y);
*width = window->windowed.w;
*height = window->windowed.h;
break;
case SDL_WINDOWRECT_FLOATING:
SDL_RelativeToGlobalForWindow(window, window->floating.x, window->floating.y, x, y);
*width = window->floating.w;
*height = window->floating.h;
break;
default:
// Should never be here
SDL_assert_release(false);
*width = 0;
*height = 0;
break;
}
/* Copy the client size in pixels into this rect structure,
which we'll then adjust with AdjustWindowRectEx */
rect.left = 0;
rect.top = 0;
rect.right = *width;
rect.bottom = *height;
/* borderless windows will have WM_NCCALCSIZE return 0 for the non-client area. When this happens, it looks like windows will send a resize message
expanding the window client area to the previous window + chrome size, so shouldn't need to adjust the window size for the set styles.
*/
if (!(window->flags & SDL_WINDOW_BORDERLESS)) {
#if defined(SDL_PLATFORM_XBOXONE) || defined(SDL_PLATFORM_XBOXSERIES)
AdjustWindowRectEx(&rect, style, menu, 0);
#else
if (WIN_IsPerMonitorV2DPIAware(SDL_GetVideoDevice())) {
/* With per-monitor v2, the window border/titlebar size depend on the DPI, so we need to call AdjustWindowRectExForDpi instead of
AdjustWindowRectEx. */
if (videodata) {
UINT frame_dpi;
SDL_WindowData *data = window->internal;
frame_dpi = (data && videodata->GetDpiForWindow) ? videodata->GetDpiForWindow(data->hwnd) : USER_DEFAULT_SCREEN_DPI;
if (videodata->AdjustWindowRectExForDpi(&rect, style, menu, styleEx, frame_dpi) == 0) {
return WIN_SetError("AdjustWindowRectExForDpi()");
}
}
} else {
if (AdjustWindowRectEx(&rect, style, menu, styleEx) == 0) {
return WIN_SetError("AdjustWindowRectEx()");
}
}
#endif
}
// Final rect in Windows screen space, including the frame
*x += rect.left;
*y += rect.top;
*width = (rect.right - rect.left);
*height = (rect.bottom - rect.top);
#ifdef HIGHDPI_DEBUG
SDL_Log("WIN_AdjustWindowRectWithStyle: in: %d, %d, %dx%d, returning: %d, %d, %dx%d, used dpi %d for frame calculation",
(rect_type == SDL_WINDOWRECT_FLOATING ? window->floating.x : rect_type == SDL_WINDOWRECT_WINDOWED ? window->windowed.x : window->x),
(rect_type == SDL_WINDOWRECT_FLOATING ? window->floating.y : rect_type == SDL_WINDOWRECT_WINDOWED ? window->windowed.y : window->y),
(rect_type == SDL_WINDOWRECT_FLOATING ? window->floating.w : rect_type == SDL_WINDOWRECT_WINDOWED ? window->windowed.w : window->w),
(rect_type == SDL_WINDOWRECT_FLOATING ? window->floating.h : rect_type == SDL_WINDOWRECT_WINDOWED ? window->windowed.h : window->h),
*x, *y, *width, *height, frame_dpi);
#endif
return true;
}
bool WIN_AdjustWindowRect(SDL_Window *window, int *x, int *y, int *width, int *height, SDL_WindowRect rect_type)
{
SDL_WindowData *data = window->internal;
HWND hwnd = data->hwnd;
DWORD style, styleEx;
BOOL menu;
style = GetWindowLong(hwnd, GWL_STYLE);
styleEx = GetWindowLong(hwnd, GWL_EXSTYLE);
#if defined(SDL_PLATFORM_XBOXONE) || defined(SDL_PLATFORM_XBOXSERIES)
menu = FALSE;
#else
menu = (style & WS_CHILDWINDOW) ? FALSE : (GetMenu(hwnd) != NULL);
#endif
return WIN_AdjustWindowRectWithStyle(window, style, styleEx, menu, x, y, width, height, rect_type);
}
bool WIN_AdjustWindowRectForHWND(HWND hwnd, LPRECT lpRect, UINT frame_dpi)
{
SDL_VideoDevice *videodevice = SDL_GetVideoDevice();
SDL_VideoData *videodata = videodevice ? videodevice->internal : NULL;
DWORD style, styleEx;
BOOL menu;
style = GetWindowLong(hwnd, GWL_STYLE);
styleEx = GetWindowLong(hwnd, GWL_EXSTYLE);
#if defined(SDL_PLATFORM_XBOXONE) || defined(SDL_PLATFORM_XBOXSERIES)
menu = FALSE;
#else
menu = (style & WS_CHILDWINDOW) ? FALSE : (GetMenu(hwnd) != NULL);
#endif
#if defined(SDL_PLATFORM_XBOXONE) || defined(SDL_PLATFORM_XBOXSERIES)
AdjustWindowRectEx(lpRect, style, menu, styleEx);
#else
if (WIN_IsPerMonitorV2DPIAware(videodevice)) {
// With per-monitor v2, the window border/titlebar size depend on the DPI, so we need to call AdjustWindowRectExForDpi instead of AdjustWindowRectEx.
if (!frame_dpi) {
frame_dpi = videodata->GetDpiForWindow ? videodata->GetDpiForWindow(hwnd) : USER_DEFAULT_SCREEN_DPI;
}
if (!videodata->AdjustWindowRectExForDpi(lpRect, style, menu, styleEx, frame_dpi)) {
return WIN_SetError("AdjustWindowRectExForDpi()");
}
} else {
if (!AdjustWindowRectEx(lpRect, style, menu, styleEx)) {
return WIN_SetError("AdjustWindowRectEx()");
}
}
#endif
return true;
}
bool WIN_SetWindowPositionInternal(SDL_Window *window, UINT flags, SDL_WindowRect rect_type)
{
SDL_Window *child_window;
SDL_WindowData *data = window->internal;
HWND hwnd = data->hwnd;
HWND top;
int x, y;
int w, h;
bool result = true;
// Figure out what the window area will be
if (SDL_ShouldAllowTopmost() && (window->flags & SDL_WINDOW_ALWAYS_ON_TOP)) {
top = HWND_TOPMOST;
} else {
top = HWND_NOTOPMOST;
}
WIN_AdjustWindowRect(window, &x, &y, &w, &h, rect_type);
data->expected_resize = true;
if (SetWindowPos(hwnd, top, x, y, w, h, flags) == 0) {
result = WIN_SetError("SetWindowPos()");
}
data->expected_resize = false;
// Update any child windows
for (child_window = window->first_child; child_window; child_window = child_window->next_sibling) {
if (!WIN_SetWindowPositionInternal(child_window, flags, SDL_WINDOWRECT_CURRENT)) {
result = false;
}
}
return result;
}
static void SDLCALL WIN_MouseRelativeModeCenterChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
{
SDL_WindowData *data = (SDL_WindowData *)userdata;
data->mouse_relative_mode_center = SDL_GetStringBoolean(hint, true);
}
static SDL_WindowEraseBackgroundMode GetEraseBackgroundModeHint(void)
{
const char *hint = SDL_GetHint(SDL_HINT_WINDOWS_ERASE_BACKGROUND_MODE);
if (!hint)
return SDL_ERASEBACKGROUNDMODE_INITIAL;
if (SDL_strstr(hint, "never"))
return SDL_ERASEBACKGROUNDMODE_NEVER;
if (SDL_strstr(hint, "initial"))
return SDL_ERASEBACKGROUNDMODE_INITIAL;
if (SDL_strstr(hint, "always"))
return SDL_ERASEBACKGROUNDMODE_ALWAYS;
int mode = SDL_GetStringInteger(hint, 1);
if (mode < 0 || mode > 2) {
SDL_Log("GetEraseBackgroundModeHint: invalid value for SDL_HINT_WINDOWS_ERASE_BACKGROUND_MODE. Fallback to default");
return SDL_ERASEBACKGROUNDMODE_INITIAL;
}
return (SDL_WindowEraseBackgroundMode)mode;
}
static bool SetupWindowData(SDL_VideoDevice *_this, SDL_Window *window, HWND hwnd, HWND parent)
{
SDL_VideoData *videodata = _this->internal;
SDL_WindowData *data;
// Allocate the window data
data = (SDL_WindowData *)SDL_calloc(1, sizeof(*data));
if (!data) {
return false;
}
data->window = window;
data->hwnd = hwnd;
data->parent = parent;
#if defined(SDL_PLATFORM_XBOXONE) || defined(SDL_PLATFORM_XBOXSERIES)
data->hdc = (HDC)data->hwnd;
#else
data->hdc = GetDC(hwnd);
#endif
data->hinstance = (HINSTANCE)GetWindowLongPtr(hwnd, GWLP_HINSTANCE);
data->mouse_button_flags = (WPARAM)-1;
data->last_pointer_update = (LPARAM)-1;
data->videodata = videodata;
data->initializing = true;
data->last_displayID = window->last_displayID;
data->dwma_border_color = DWMWA_COLOR_DEFAULT;
data->hint_erase_background_mode = GetEraseBackgroundModeHint();
if (SDL_GetHintBoolean("SDL_WINDOW_RETAIN_CONTENT", false)) {
data->copybits_flag = 0;
} else {
data->copybits_flag = SWP_NOCOPYBITS;
}
#ifdef HIGHDPI_DEBUG
SDL_Log("SetupWindowData: initialized data->scaling_dpi to %d", data->scaling_dpi);
#endif
SDL_AddHintCallback(SDL_HINT_MOUSE_RELATIVE_MODE_CENTER, WIN_MouseRelativeModeCenterChanged, data);
#if !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
// Associate the data with the window
if (!SetProp(hwnd, TEXT("SDL_WindowData"), data)) {
ReleaseDC(hwnd, data->hdc);
SDL_free(data);
return WIN_SetError("SetProp() failed");
}
#endif
window->internal = data;
// Set up the window proc function
#ifdef GWLP_WNDPROC
data->wndproc = (WNDPROC)GetWindowLongPtr(hwnd, GWLP_WNDPROC);
if (data->wndproc == WIN_WindowProc) {
data->wndproc = NULL;
} else {
SetWindowLongPtr(hwnd, GWLP_WNDPROC, (LONG_PTR)WIN_WindowProc);
}
#else
data->wndproc = (WNDPROC)GetWindowLong(hwnd, GWL_WNDPROC);
if (data->wndproc == WIN_WindowProc) {
data->wndproc = NULL;
} else {
SetWindowLong(hwnd, GWL_WNDPROC, (LONG_PTR)WIN_WindowProc);
}
#endif
// Fill in the SDL window with the window state
{
DWORD style = GetWindowLong(hwnd, GWL_STYLE);
if (style & WS_VISIBLE) {
window->flags &= ~SDL_WINDOW_HIDDEN;
} else {
window->flags |= SDL_WINDOW_HIDDEN;
}
if (style & WS_POPUP) {
window->flags |= SDL_WINDOW_BORDERLESS;
} else {
window->flags &= ~SDL_WINDOW_BORDERLESS;
}
if (style & WS_THICKFRAME) {
window->flags |= SDL_WINDOW_RESIZABLE;
} else {
window->flags &= ~SDL_WINDOW_RESIZABLE;
}
#ifdef WS_MAXIMIZE
if (style & WS_MAXIMIZE) {
window->flags |= SDL_WINDOW_MAXIMIZED;
} else
#endif
{
window->flags &= ~SDL_WINDOW_MAXIMIZED;
}
#ifdef WS_MINIMIZE
if (style & WS_MINIMIZE) {
window->flags |= SDL_WINDOW_MINIMIZED;
} else
#endif
{
window->flags &= ~SDL_WINDOW_MINIMIZED;
}
}
if (!(window->flags & SDL_WINDOW_MINIMIZED)) {
RECT rect;
if (GetClientRect(hwnd, &rect) && !WIN_IsRectEmpty(&rect)) {
int w = rect.right;
int h = rect.bottom;
if (window->flags & SDL_WINDOW_EXTERNAL) {
window->floating.w = window->windowed.w = window->w = w;
window->floating.h = window->windowed.h = window->h = h;
} else if ((window->windowed.w && window->windowed.w != w) || (window->windowed.h && window->windowed.h != h)) {
// We tried to create a window larger than the desktop and Windows didn't allow it. Override!
int x, y;
// Figure out what the window area will be
WIN_AdjustWindowRect(window, &x, &y, &w, &h, SDL_WINDOWRECT_FLOATING);
data->expected_resize = true;
SetWindowPos(hwnd, NULL, x, y, w, h, data->copybits_flag | SWP_NOZORDER | SWP_NOOWNERZORDER | SWP_NOACTIVATE);
data->expected_resize = false;
} else {
window->w = w;
window->h = h;
}
}
}
#if !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
if (!(window->flags & SDL_WINDOW_MINIMIZED)) {
POINT point;
point.x = 0;
point.y = 0;
if (ClientToScreen(hwnd, &point)) {
if (window->flags & SDL_WINDOW_EXTERNAL) {
window->floating.x = window->windowed.x = point.x;
window->floating.y = window->windowed.y = point.y;
}
window->x = point.x;
window->y = point.y;
}
}
WIN_UpdateWindowICCProfile(window, false);
#endif
#if defined(SDL_PLATFORM_XBOXONE) || defined(SDL_PLATFORM_XBOXSERIES)
window->flags |= SDL_WINDOW_INPUT_FOCUS;
SDL_SetKeyboardFocus(window);
#else
if (GetFocus() == hwnd) {
window->flags |= SDL_WINDOW_INPUT_FOCUS;
SDL_SetKeyboardFocus(window);
WIN_UpdateClipCursor(window);
}
#endif
if (window->flags & SDL_WINDOW_ALWAYS_ON_TOP) {
WIN_SetWindowAlwaysOnTop(_this, window, true);
} else {
WIN_SetWindowAlwaysOnTop(_this, window, false);
}
#if !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
// Enable multi-touch
if (videodata->RegisterTouchWindow) {
videodata->RegisterTouchWindow(hwnd, (TWF_FINETOUCH | TWF_WANTPALM));
}
#endif
if (data->parent && !window->parent) {
data->destroy_parent_with_window = true;
}
data->initializing = false;
#if !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
if (window->flags & SDL_WINDOW_EXTERNAL) {
// Query the title from the existing window
LPTSTR title;
int titleLen;
bool isstack;
titleLen = GetWindowTextLength(hwnd);
title = SDL_small_alloc(TCHAR, titleLen + 1, &isstack);
if (title) {
titleLen = GetWindowText(hwnd, title, titleLen + 1);
} else {
titleLen = 0;
}
if (titleLen > 0) {
window->title = WIN_StringToUTF8(title);
}
if (title) {
SDL_small_free(title, isstack);
}
}
#endif // !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
SDL_PropertiesID props = SDL_GetWindowProperties(window);
SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WIN32_HWND_POINTER, data->hwnd);
SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WIN32_HDC_POINTER, data->hdc);
SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WIN32_INSTANCE_POINTER, data->hinstance);
// All done!
return true;
}
static void CleanupWindowData(SDL_VideoDevice *_this, SDL_Window *window)
{
SDL_WindowData *data = window->internal;
if (data) {
SDL_RemoveHintCallback(SDL_HINT_MOUSE_RELATIVE_MODE_CENTER, WIN_MouseRelativeModeCenterChanged, data);
#if !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
if (data->drop_target) {
WIN_AcceptDragAndDrop(window, false);
}
if (data->ICMFileName) {
SDL_free(data->ICMFileName);
}
if (data->keyboard_hook) {
UnhookWindowsHookEx(data->keyboard_hook);
}
ReleaseDC(data->hwnd, data->hdc);
RemoveProp(data->hwnd, TEXT("SDL_WindowData"));
#endif
if (!(window->flags & SDL_WINDOW_EXTERNAL)) {
DestroyWindow(data->hwnd);
if (data->destroy_parent_with_window && data->parent) {
DestroyWindow(data->parent);
}
} else {
// Restore any original event handler...
if (data->wndproc) {
#ifdef GWLP_WNDPROC
SetWindowLongPtr(data->hwnd, GWLP_WNDPROC,
(LONG_PTR)data->wndproc);
#else
SetWindowLong(data->hwnd, GWL_WNDPROC,
(LONG_PTR)data->wndproc);
#endif
}
}
SDL_free(data);
}
window->internal = NULL;
}
static void WIN_ConstrainPopup(SDL_Window *window)
{
// Clamp popup windows to the output borders
if (SDL_WINDOW_IS_POPUP(window)) {
SDL_Window *w;
SDL_DisplayID displayID;
SDL_Rect rect;
int abs_x = window->floating.x;
int abs_y = window->floating.y;
int offset_x = 0, offset_y = 0;
// Calculate the total offset from the parents
for (w = window->parent; w->parent; w = w->parent) {
offset_x += w->x;
offset_y += w->y;
}
offset_x += w->x;
offset_y += w->y;
abs_x += offset_x;
abs_y += offset_y;
// Constrain the popup window to the display of the toplevel parent
displayID = SDL_GetDisplayForWindow(w);
SDL_GetDisplayBounds(displayID, &rect);
if (abs_x + window->floating.w > rect.x + rect.w) {
abs_x -= (abs_x + window->floating.w) - (rect.x + rect.w);
}
if (abs_y + window->floating.h > rect.y + rect.h) {
abs_y -= (abs_y + window->floating.h) - (rect.y + rect.h);
}
abs_x = SDL_max(abs_x, rect.x);
abs_y = SDL_max(abs_y, rect.y);
window->floating.x = abs_x - offset_x;
window->floating.y = abs_y - offset_y;
}
}
static void WIN_SetKeyboardFocus(SDL_Window *window)
{
SDL_Window *topmost = window;
// Find the topmost parent
while (topmost->parent) {
topmost = topmost->parent;
}
topmost->internal->keyboard_focus = window;
SDL_SetKeyboardFocus(window);
}
bool WIN_CreateWindow(SDL_VideoDevice *_this, SDL_Window *window, SDL_PropertiesID create_props)
{
HWND hwnd = (HWND)SDL_GetPointerProperty(create_props, SDL_PROP_WINDOW_CREATE_WIN32_HWND_POINTER, SDL_GetPointerProperty(create_props, "sdl2-compat.external_window", NULL));
HWND parent = NULL;
if (hwnd) {
window->flags |= SDL_WINDOW_EXTERNAL;
if (!SetupWindowData(_this, window, hwnd, parent)) {
return false;
}
} else {
DWORD style = STYLE_BASIC;
DWORD styleEx = 0;
int x, y;
int w, h;
if (SDL_WINDOW_IS_POPUP(window)) {
parent = window->parent->internal->hwnd;
} else if (window->flags & SDL_WINDOW_UTILITY) {
parent = CreateWindow(SDL_Appname, TEXT(""), STYLE_BASIC, 0, 0, 32, 32, NULL, NULL, SDL_Instance, NULL);
}
style |= GetWindowStyle(window);
styleEx |= GetWindowStyleEx(window);
// Figure out what the window area will be
WIN_ConstrainPopup(window);
WIN_AdjustWindowRectWithStyle(window, style, styleEx, FALSE, &x, &y, &w, &h, SDL_WINDOWRECT_FLOATING);
hwnd = CreateWindowEx(styleEx, SDL_Appname, TEXT(""), style,
x, y, w, h, parent, NULL, SDL_Instance, NULL);
if (!hwnd) {
return WIN_SetError("Couldn't create window");
}
WIN_UpdateDarkModeForHWND(hwnd);
WIN_PumpEvents(_this);
if (!SetupWindowData(_this, window, hwnd, parent)) {
DestroyWindow(hwnd);
if (parent) {
DestroyWindow(parent);
}
return false;
}
// Inform Windows of the frame change so we can respond to WM_NCCALCSIZE
SetWindowPos(hwnd, NULL, 0, 0, 0, 0, SWP_FRAMECHANGED | SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER | SWP_NOOWNERZORDER | SWP_NOACTIVATE);
if (window->flags & SDL_WINDOW_MINIMIZED) {
/* TODO: We have to clear SDL_WINDOW_HIDDEN here to ensure the window flags match the window state. The
window is already shown after this and windows with WS_MINIMIZE do not generate a WM_SHOWWINDOW. This
means you can't currently create a window that is initially hidden and is minimized when shown.
*/
window->flags &= ~SDL_WINDOW_HIDDEN;
ShowWindow(hwnd, SW_SHOWMINNOACTIVE);
}
}
#if !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
// FIXME: does not work on all hardware configurations with different renders (i.e. hybrid GPUs)
if (window->flags & SDL_WINDOW_TRANSPARENT) {
void *handle = SDL_LoadObject("dwmapi.dll");
if (handle) {
DwmEnableBlurBehindWindow_t DwmEnableBlurBehindWindowFunc = (DwmEnableBlurBehindWindow_t)SDL_LoadFunction(handle, "DwmEnableBlurBehindWindow");
if (DwmEnableBlurBehindWindowFunc) {
/* The region indicates which part of the window will be blurred and rest will be transparent. This
is because the alpha value of the window will be used for non-blurred areas
We can use (-1, -1, 0, 0) boundary to make sure no pixels are being blurred
*/
HRGN rgn = CreateRectRgn(-1, -1, 0, 0);
DWM_BLURBEHIND bb;
bb.flags = (DWM_BB_ENABLE | DWM_BB_BLURREGION);
bb.enable = TRUE;
bb.blur_region = rgn;
bb.transition_on_maxed = FALSE;
DwmEnableBlurBehindWindowFunc(hwnd, &bb);
DeleteObject(rgn);
}
SDL_UnloadObject(handle);
}
}
HWND share_hwnd = (HWND)SDL_GetPointerProperty(create_props, SDL_PROP_WINDOW_CREATE_WIN32_PIXEL_FORMAT_HWND_POINTER, NULL);
if (share_hwnd) {
HDC hdc = GetDC(share_hwnd);
int pixel_format = GetPixelFormat(hdc);
PIXELFORMATDESCRIPTOR pfd;
SDL_zero(pfd);
DescribePixelFormat(hdc, pixel_format, sizeof(pfd), &pfd);
ReleaseDC(share_hwnd, hdc);
if (!SetPixelFormat(window->internal->hdc, pixel_format, &pfd)) {
WIN_DestroyWindow(_this, window);
return WIN_SetError("SetPixelFormat()");
}
} else {
if (!(window->flags & SDL_WINDOW_OPENGL)) {
return true;
}
// The rest of this macro mess is for OpenGL or OpenGL ES windows
#ifdef SDL_VIDEO_OPENGL_ES2
if ((_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES ||
SDL_GetHintBoolean(SDL_HINT_VIDEO_FORCE_EGL, false))
#ifdef SDL_VIDEO_OPENGL_WGL
&& (!_this->gl_data || WIN_GL_UseEGL(_this))
#endif // SDL_VIDEO_OPENGL_WGL
) {
#ifdef SDL_VIDEO_OPENGL_EGL
if (!WIN_GLES_SetupWindow(_this, window)) {
WIN_DestroyWindow(_this, window);
return false;
}
return true;
#else
return SDL_SetError("Could not create GLES window surface (EGL support not configured)");
#endif // SDL_VIDEO_OPENGL_EGL
}
#endif // SDL_VIDEO_OPENGL_ES2
#ifdef SDL_VIDEO_OPENGL_WGL
if (!WIN_GL_SetupWindow(_this, window)) {
WIN_DestroyWindow(_this, window);
return false;
}
#else
return SDL_SetError("Could not create GL window (WGL support not configured)");
#endif
}
#endif // !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
return true;
}
void WIN_SetWindowTitle(SDL_VideoDevice *_this, SDL_Window *window)
{
#if !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
HWND hwnd = window->internal->hwnd;
LPTSTR title = WIN_UTF8ToString(window->title);
SetWindowText(hwnd, title);
SDL_free(title);
#endif
}
bool WIN_SetWindowIcon(SDL_VideoDevice *_this, SDL_Window *window, SDL_Surface *icon)
{
#if !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
HWND hwnd = window->internal->hwnd;
HICON hicon = NULL;
BYTE *icon_bmp;
int icon_len, mask_len, row_len, y;
BITMAPINFOHEADER *bmi;
Uint8 *dst;
bool isstack;
bool result = true;
// Create temporary buffer for ICONIMAGE structure
SDL_COMPILE_TIME_ASSERT(WIN_SetWindowIcon_uses_BITMAPINFOHEADER_to_prepare_an_ICONIMAGE, sizeof(BITMAPINFOHEADER) == 40);
mask_len = (icon->h * (icon->w + 7) / 8);
icon_len = sizeof(BITMAPINFOHEADER) + icon->h * icon->w * sizeof(Uint32) + mask_len;
icon_bmp = SDL_small_alloc(BYTE, icon_len, &isstack);
// Write the BITMAPINFO header
bmi = (BITMAPINFOHEADER *)icon_bmp;
bmi->biSize = SDL_Swap32LE(sizeof(BITMAPINFOHEADER));
bmi->biWidth = SDL_Swap32LE(icon->w);
bmi->biHeight = SDL_Swap32LE(icon->h * 2);
bmi->biPlanes = SDL_Swap16LE(1);
bmi->biBitCount = SDL_Swap16LE(32);
bmi->biCompression = SDL_Swap32LE(BI_RGB);
bmi->biSizeImage = SDL_Swap32LE(icon->h * icon->w * sizeof(Uint32));
bmi->biXPelsPerMeter = SDL_Swap32LE(0);
bmi->biYPelsPerMeter = SDL_Swap32LE(0);
bmi->biClrUsed = SDL_Swap32LE(0);
bmi->biClrImportant = SDL_Swap32LE(0);
// Write the pixels upside down into the bitmap buffer
SDL_assert(icon->format == SDL_PIXELFORMAT_ARGB8888);
dst = &icon_bmp[sizeof(BITMAPINFOHEADER)];
row_len = icon->w * sizeof(Uint32);
y = icon->h;
while (y--) {
Uint8 *src = (Uint8 *)icon->pixels + y * icon->pitch;
SDL_memcpy(dst, src, row_len);
dst += row_len;
}
// Write the mask
SDL_memset(icon_bmp + icon_len - mask_len, 0xFF, mask_len);
hicon = CreateIconFromResource(icon_bmp, icon_len, TRUE, 0x00030000);
SDL_small_free(icon_bmp, isstack);
if (!hicon) {
result = SDL_SetError("SetWindowIcon() failed, error %08X", (unsigned int)GetLastError());
}
// Set the icon for the window
SendMessage(hwnd, WM_SETICON, ICON_SMALL, (LPARAM)hicon);
// Set the icon in the task manager (should we do this?)
SendMessage(hwnd, WM_SETICON, ICON_BIG, (LPARAM)hicon);
return result;
#else
return SDL_Unsupported();
#endif
}
bool WIN_SetWindowPosition(SDL_VideoDevice *_this, SDL_Window *window)
{
/* HighDPI support: removed SWP_NOSIZE. If the move results in a DPI change, we need to allow
* the window to resize (e.g. AdjustWindowRectExForDpi frame sizes are different).
*/
if (!(window->flags & SDL_WINDOW_FULLSCREEN)) {
if (!(window->flags & (SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED))) {
WIN_ConstrainPopup(window);
return WIN_SetWindowPositionInternal(window,
window->internal->copybits_flag | SWP_NOZORDER | SWP_NOOWNERZORDER |
SWP_NOACTIVATE, SDL_WINDOWRECT_FLOATING);
} else {
window->internal->floating_rect_pending = true;
}
} else {
return SDL_UpdateFullscreenMode(window, SDL_FULLSCREEN_OP_ENTER, true);
}
return true;
}
void WIN_SetWindowSize(SDL_VideoDevice *_this, SDL_Window *window)
{
if (!(window->flags & (SDL_WINDOW_FULLSCREEN | SDL_WINDOW_MAXIMIZED))) {
WIN_SetWindowPositionInternal(window, window->internal->copybits_flag | SWP_NOMOVE | SWP_NOZORDER | SWP_NOOWNERZORDER | SWP_NOACTIVATE, SDL_WINDOWRECT_FLOATING);
} else {
window->internal->floating_rect_pending = true;
}
}
bool WIN_GetWindowBordersSize(SDL_VideoDevice *_this, SDL_Window *window, int *top, int *left, int *bottom, int *right)
{
#if defined(SDL_PLATFORM_XBOXONE) || defined(SDL_PLATFORM_XBOXSERIES)
HWND hwnd = window->internal->hwnd;
RECT rcClient;
/* rcClient stores the size of the inner window, while rcWindow stores the outer size relative to the top-left
* screen position; so the top/left values of rcClient are always {0,0} and bottom/right are {height,width} */
GetClientRect(hwnd, &rcClient);
*top = rcClient.top;
*left = rcClient.left;
*bottom = rcClient.bottom;
*right = rcClient.right;
return true;
#else // !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
HWND hwnd = window->internal->hwnd;
RECT rcClient, rcWindow;
POINT ptDiff;
/* rcClient stores the size of the inner window, while rcWindow stores the outer size relative to the top-left
* screen position; so the top/left values of rcClient are always {0,0} and bottom/right are {height,width} */
if (!GetClientRect(hwnd, &rcClient)) {
return SDL_SetError("GetClientRect() failed, error %08X", (unsigned int)GetLastError());
}
if (!GetWindowRect(hwnd, &rcWindow)) {
return SDL_SetError("GetWindowRect() failed, error %08X", (unsigned int)GetLastError());
}
/* convert the top/left values to make them relative to
* the window; they will end up being slightly negative */
ptDiff.y = rcWindow.top;
ptDiff.x = rcWindow.left;
if (!ScreenToClient(hwnd, &ptDiff)) {
return SDL_SetError("ScreenToClient() failed, error %08X", (unsigned int)GetLastError());
}
rcWindow.top = ptDiff.y;
rcWindow.left = ptDiff.x;
/* convert the bottom/right values to make them relative to the window,
* these will be slightly bigger than the inner width/height */
ptDiff.y = rcWindow.bottom;
ptDiff.x = rcWindow.right;
if (!ScreenToClient(hwnd, &ptDiff)) {
return SDL_SetError("ScreenToClient() failed, error %08X", (unsigned int)GetLastError());
}
rcWindow.bottom = ptDiff.y;
rcWindow.right = ptDiff.x;
/* Now that both the inner and outer rects use the same coordinate system we can subtract them to get the border size.
* Keep in mind that the top/left coordinates of rcWindow are negative because the border lies slightly before {0,0},
* so switch them around because SDL3 wants them in positive. */
*top = rcClient.top - rcWindow.top;
*left = rcClient.left - rcWindow.left;
*bottom = rcWindow.bottom - rcClient.bottom;
*right = rcWindow.right - rcClient.right;
return true;
#endif // !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
}
void WIN_GetWindowSizeInPixels(SDL_VideoDevice *_this, SDL_Window *window, int *w, int *h)
{
const SDL_WindowData *data = window->internal;
HWND hwnd = data->hwnd;
RECT rect;
if (GetClientRect(hwnd, &rect) && !WIN_IsRectEmpty(&rect)) {
*w = rect.right;
*h = rect.bottom;
} else if (window->last_pixel_w && window->last_pixel_h) {
*w = window->last_pixel_w;
*h = window->last_pixel_h;