src/video/android/SDL_androidwindow.c

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2026 Sam Lantinga <slouken@libsdl.org>

  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_ANDROID

#include "../SDL_sysvideo.h"
#include "../../events/SDL_keyboard_c.h"
#include "../../events/SDL_mouse_c.h"
#include "../../events/SDL_windowevents_c.h"
#include "../../core/android/SDL_android.h"

#include "SDL_androidvideo.h"
#include "SDL_androidevents.h"
#include "SDL_androidwindow.h"


// Currently only one window
static bool window_created = false;

bool Android_CreateWindow(SDL_VideoDevice *_this, SDL_Window *window, SDL_PropertiesID create_props)
{
    SDL_WindowData *data;
    bool result = true;

    // Android_WaitActiveAndLockActivity() process some RPC:
    // "onSurfaceCreated" that needs "window->internal"
    // and also "nativeSetScreenResolution"

    data = (SDL_WindowData *)SDL_calloc(1, sizeof(*data));
    if (!data) {
        return false;
    }

#ifdef SDL_VIDEO_OPENGL_EGL
    data->egl_surface = EGL_NO_SURFACE;
#endif
    window->internal = data;

    if (!Android_WaitActiveAndLockActivity(window)) {
        return false;
    }

    if (window_created) {
        result = SDL_SetError("Android only supports one window");
        goto endfunction;
    }

    // Set orientation
    Android_JNI_SetOrientation(window->w, window->h, window->flags & SDL_WINDOW_RESIZABLE, SDL_GetHint(SDL_HINT_ORIENTATIONS));

    // Adjust the window data to match the screen
    window->x = 0;
    window->y = 0;
    window->w = Android_SurfaceWidth;
    window->h = Android_SurfaceHeight;

    // One window, it always has focus
    SDL_SetMouseFocus(window);
    SDL_SetKeyboardFocus(window);

    if (!Android_nativeSurfaceCreated(window)) {
        result = false;
        goto endfunction;
    }

    if (!Android_nativeSurfaceChanged(window)) {
        result = false;
        goto endfunction;
    }

    SDL_SetWindowSafeAreaInsets(window, Android_SafeInsetLeft, Android_SafeInsetRight, Android_SafeInsetTop, Android_SafeInsetBottom);

    window_created = true;

endfunction:

    Android_UnlockActivityState();

    return result;
}

void Android_SetWindowTitle(SDL_VideoDevice *_this, SDL_Window *window)
{
    Android_JNI_SetActivityTitle(window->title);
}

SDL_FullscreenResult Android_SetWindowFullscreen(SDL_VideoDevice *_this, SDL_Window *window, SDL_VideoDisplay *display, SDL_FullscreenOp fullscreen)
{
    SDL_WindowData *data;
    int old_w, old_h, new_w, new_h;

    // If the window is being destroyed don't change visible state
    if (!window->is_destroying) {
        Android_JNI_SetWindowStyle(fullscreen);
    }

    /* Ensure our size matches reality after we've executed the window style change.
     *
     * It is possible that we've set width and height to the full-size display, but on
     * Samsung DeX or Chromebooks or other windowed Android environments, our window may
     * still not be the full display size.
     */
    if (!SDL_IsDeXMode() && !SDL_IsChromebook()) {
        goto endfunction;
    }

    data = window->internal;
    if (!data || !data->native_window) {
        if (data && !data->native_window) {
            SDL_SetError("Missing native window");
        }
        goto endfunction;
    }

    old_w = window->w;
    old_h = window->h;

    new_w = ANativeWindow_getWidth(data->native_window);
    new_h = ANativeWindow_getHeight(data->native_window);

    if (new_w < 0 || new_h < 0) {
        SDL_SetError("ANativeWindow_getWidth/Height() fails");
    }

    if (old_w != new_w || old_h != new_h) {
        SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_RESIZED, new_w, new_h);
    }

endfunction:

    return SDL_FULLSCREEN_SUCCEEDED;
}

void Android_MinimizeWindow(SDL_VideoDevice *_this, SDL_Window *window)
{
    Android_JNI_MinimizeWindow();
}

void Android_SetWindowResizable(SDL_VideoDevice *_this, SDL_Window *window, bool resizable)
{
    // Set orientation
    Android_JNI_SetOrientation(window->w, window->h, window->flags & SDL_WINDOW_RESIZABLE, SDL_GetHint(SDL_HINT_ORIENTATIONS));
}

void Android_DestroyWindow(SDL_VideoDevice *_this, SDL_Window *window)
{
    window_created = false;


    if (window->internal) {
        Android_nativeSurfaceCreated(window);
        SDL_free(window->internal);
        window->internal = NULL;
    }
}


// Those functions called from RPC onNativeSurface{Created,Changed,Destroyed}()
// and SDL_{Create,Destroy}Window();

bool Android_nativeSurfaceCreated(SDL_Window *window)
{
    if (window) {
        SDL_WindowData *data = window->internal;

        data->native_window = Android_JNI_GetNativeWindow();
        SDL_SetPointerProperty(SDL_GetWindowProperties(window), SDL_PROP_WINDOW_ANDROID_WINDOW_POINTER, data->native_window);
        if (data->native_window == NULL) {
            SDL_SetError("Could not fetch native window");
            return false;
        }
        return true;
    }

    return false;
}

bool Android_nativeSurfaceChanged(SDL_Window *window)
{
    if (window) {
#ifdef SDL_VIDEO_OPENGL_EGL
        /* Do not create EGLSurface for Vulkan window since it will then make the window
           incompatible with vkCreateAndroidSurfaceKHR */
        if (window->flags & SDL_WINDOW_OPENGL) {
            SDL_VideoDevice *_this = SDL_GetVideoDevice();
            SDL_WindowData *data = window->internal;

            // If the surface has been previously destroyed by onNativeSurfaceDestroyed
            // or if it is the first time, recreate it.
            if (data->egl_surface == EGL_NO_SURFACE) {
                data->egl_surface = SDL_EGL_CreateSurface(_this, window, (NativeWindowType)data->native_window);
                SDL_SetPointerProperty(SDL_GetWindowProperties(window), SDL_PROP_WINDOW_ANDROID_SURFACE_POINTER, data->egl_surface);
            }

            if (data->egl_surface == EGL_NO_SURFACE) {
                if (data->native_window) {
                    ANativeWindow_release(data->native_window);
                    data->native_window = 0;
                }
                return false;
            }
        }
#endif
        return true;
    }

    return false;
}

void Android_nativeSurfaceDestroyed(SDL_Window *window)
{
    if (window) {
        SDL_WindowData *data = window->internal;

#ifdef SDL_VIDEO_OPENGL_EGL
        if (data->egl_surface != EGL_NO_SURFACE) {
            SDL_EGL_DestroySurface(SDL_GetVideoDevice(), data->egl_surface);
            data->egl_surface = EGL_NO_SURFACE;
        }
#endif

        if (data->native_window) {
            ANativeWindow_release(data->native_window);
            data->native_window = NULL;
        }
    }
}

#endif // SDL_VIDEO_DRIVER_ANDROID