From 7c60bec493404905f512c835f502f1ace4eff003 Mon Sep 17 00:00:00 2001 From: Sam Lantinga Date: Wed, 3 Jan 2018 10:58:58 -0800 Subject: [PATCH] Fixed bug 4018 - Implement SDL_GetWindowBordersSize() under Windows/Win32/WinAPI Ismael Ferreras Morezuelas (Swyter) As a new year gift I have implemented the Windows version of SDL_GetWindowBordersSize(). I needed it for auto-selecting a cozy window size for the game I'm currently working on and noticed that it only worked under X11, so I thought it could be a good excuse to contribute back more stuff. The Mercurial patch is attached as a .diff file. Let me know what you think. Happy 2018 to all the SDL2 devs and users! -- PS: Keep in mind that Windows 10 includes the 8px invisible grip borders as part of the frame. There's a way of detecting if Aero/DWM is being used and ask only for the visible rect, but I believe that GetWindowRect() is doing that for a reason and working as intended, so I haven't changed it. (See [2]) References: [1]: http://www.firststeps.ru/mfc/winapi/r.php?72 [2]: https://stackoverflow.com/a/34143777/674685 [3]: https://stackoverflow.com/a/431548/674685 [4]: https://wiki.libsdl.org/SDL_GetWindowBordersSize --- src/video/windows/SDL_windowsvideo.c | 1 + src/video/windows/SDL_windowswindow.c | 43 +++++++++++++++++++++++++++ src/video/windows/SDL_windowswindow.h | 1 + 3 files changed, 45 insertions(+) diff --git a/src/video/windows/SDL_windowsvideo.c b/src/video/windows/SDL_windowsvideo.c index 608a4ce77..8d45b721e 100644 --- a/src/video/windows/SDL_windowsvideo.c +++ b/src/video/windows/SDL_windowsvideo.c @@ -143,6 +143,7 @@ WIN_CreateDevice(int devindex) device->SetWindowIcon = WIN_SetWindowIcon; device->SetWindowPosition = WIN_SetWindowPosition; device->SetWindowSize = WIN_SetWindowSize; + device->GetWindowBordersSize = WIN_GetWindowBordersSize; device->SetWindowOpacity = WIN_SetWindowOpacity; device->ShowWindow = WIN_ShowWindow; device->HideWindow = WIN_HideWindow; diff --git a/src/video/windows/SDL_windowswindow.c b/src/video/windows/SDL_windowswindow.c index c7405fccf..61d52d1f6 100644 --- a/src/video/windows/SDL_windowswindow.c +++ b/src/video/windows/SDL_windowswindow.c @@ -479,6 +479,49 @@ WIN_SetWindowSize(_THIS, SDL_Window * window) WIN_SetWindowPositionInternal(_this, window, SWP_NOCOPYBITS | SWP_NOMOVE | SWP_NOACTIVATE); } +int +WIN_GetWindowBordersSize(_THIS, SDL_Window * window, int *top, int *left, int *bottom, int *right) +{ + HWND hwnd = ((SDL_WindowData *) window->driverdata)->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} */ + GetClientRect(hwnd, &rcClient); + GetWindowRect(hwnd, &rcWindow); + + /* 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; + + ScreenToClient(hwnd, &ptDiff); + + 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; + + ScreenToClient(hwnd, &ptDiff); + + rcWindow.bottom = ptDiff.y; + rcWindow.right = ptDiff.x; + + /* Now that both the inner and outer rects use the same coordinate system we can substract 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 SDL2 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 0; +} + void WIN_ShowWindow(_THIS, SDL_Window * window) { diff --git a/src/video/windows/SDL_windowswindow.h b/src/video/windows/SDL_windowswindow.h index 69bcf094c..0325abb8e 100644 --- a/src/video/windows/SDL_windowswindow.h +++ b/src/video/windows/SDL_windowswindow.h @@ -58,6 +58,7 @@ extern void WIN_SetWindowTitle(_THIS, SDL_Window * window); extern void WIN_SetWindowIcon(_THIS, SDL_Window * window, SDL_Surface * icon); extern void WIN_SetWindowPosition(_THIS, SDL_Window * window); extern void WIN_SetWindowSize(_THIS, SDL_Window * window); +extern int WIN_GetWindowBordersSize(_THIS, SDL_Window * window, int *top, int *left, int *bottom, int *right); extern int WIN_SetWindowOpacity(_THIS, SDL_Window * window, float opacity); extern void WIN_ShowWindow(_THIS, SDL_Window * window); extern void WIN_HideWindow(_THIS, SDL_Window * window);