Add the SDL_GetWindowSizeInPixels function

Author: suve

units/sdl2.pas

@@ -141,7 +141,7 @@ interface
 {$I sdlaudio.inc}                // 2.26.3
 {$I sdlblendmode.inc}            // 2.0.14
 {$I sdlsurface.inc}              // 2.0.14
-{$I sdlvideo.inc}                // 2.24.0
+{$I sdlvideo.inc}                // 2.26.0
 {$I sdlshape.inc}                // 2.24.0
 {$I sdlhints.inc}                // 2.26.0
 {$I sdlloadso.inc}               // 2.24.1

units/sdlvideo.inc

@@ -739,6 +739,27 @@ procedure SDL_GetWindowSize(window: PSDL_Window; w: pcint; h: pcint); cdecl;
 function SDL_GetWindowBordersSize(window: PSDL_Window; top, left, bottom, right: pcint): cint; cdecl;
   external SDL_LibName {$IFDEF DELPHI} {$IFDEF MACOS} name '_SDL_GetWindowBordersSize' {$ENDIF} {$ENDIF};
 
+  {**
+   * Get the size of a window in pixels.
+   *
+   * This may differ from SDL_GetWindowSize() if we're rendering to a high-DPI
+   * drawable, i.e. the window was created with `SDL_WINDOW_ALLOW_HIGHDPI` on a
+   * platform with high-DPI support (Apple calls this "Retina"), and not
+   * disabled by the `SDL_HINT_VIDEO_HIGHDPI_DISABLED` hint.
+   *
+   * \param window the window from which the drawable size should be queried
+   * \param w a pointer to variable for storing the width in pixels, may be NIL
+   * \param h a pointer to variable for storing the height in pixels, may be
+   *          NIL
+   *
+   * \since This function is available since SDL 2.26.0.
+   *
+   * \sa SDL_CreateWindow
+   * \sa SDL_GetWindowSize
+   *}
+procedure SDL_GetWindowSizeInPixels(window: PSDL_Window; w, h: pcuint); cdecl;
+  external SDL_LibName {$IFDEF DELPHI} {$IFDEF MACOS} name '_SDL_GetWindowSizeInPixels' {$ENDIF} {$ENDIF};
+
   {**
    *  Set the minimum size of a window's client area.
    *