C++ SDL_GetVideoDevice函数代码示例

int
SDL_VideoModeOK(int width, int height, int bpp, Uint32 flags)
{
    int i, actual_bpp = 0;

    if (!SDL_GetVideoDevice()) {
        return 0;
    }

    if (!(flags & SDL_FULLSCREEN)) {
        SDL_DisplayMode mode;
        SDL_GetDesktopDisplayMode(GetVideoDisplay(), &mode);
        return SDL_BITSPERPIXEL(mode.format);
    }

    for (i = 0; i < SDL_GetNumDisplayModes(GetVideoDisplay()); ++i) {
        SDL_DisplayMode mode;
        SDL_GetDisplayMode(GetVideoDisplay(), i, &mode);
        if (!mode.w || !mode.h || (width == mode.w && height == mode.h)) {
            if (!mode.format) {
                return bpp;
            }
            if (SDL_BITSPERPIXEL(mode.format) >= (Uint32) bpp) {
                actual_bpp = SDL_BITSPERPIXEL(mode.format);
            }
        }
    }
    return actual_bpp;
}

static int
X11_SafetyNetErrHandler(Display * d, XErrorEvent * e)
{
    SDL_VideoDevice *device = NULL;
    /* if we trigger an error in our error handler, don't try again. */
    if (!safety_net_triggered) {
        safety_net_triggered = SDL_TRUE;
        device = SDL_GetVideoDevice();
        if (device != NULL) {
            int i;
            for (i = 0; i < device->num_displays; i++) {
                SDL_VideoDisplay *display = &device->displays[i];
                if (SDL_memcmp(&display->current_mode, &display->desktop_mode,
                               sizeof (SDL_DisplayMode)) != 0) {
                    X11_SetDisplayMode(device, display, &display->desktop_mode);
                }
            }
        }
    }

    if (orig_x11_errhandler != NULL) {
        return orig_x11_errhandler(d, e);  /* probably terminate. */
    }

    return 0;
}

static int
X11_ShowCursor(SDL_Cursor * cursor)
{
    Cursor x11_cursor = 0;

    if (cursor) {
        x11_cursor = (Cursor)cursor->driverdata;
    } else {
        x11_cursor = X11_CreateEmptyCursor();
    }

    /* FIXME: Is there a better way than this? */
    {
        SDL_VideoDevice *video = SDL_GetVideoDevice();
        Display *display = GetDisplay();
        SDL_Window *window;
        SDL_WindowData *data;

        for (window = video->windows; window; window = window->next) {
            data = (SDL_WindowData *)window->driverdata;
            if (x11_cursor != None) {
                X11_XDefineCursor(display, data->xwindow, x11_cursor);
            } else {
                X11_XUndefineCursor(display, data->xwindow);
            }
        }
        X11_XFlush(display);
    }
    return 0;
}

int Wayland_input_lock_pointer(struct SDL_WaylandInput *input)
{
    SDL_VideoDevice *vd = SDL_GetVideoDevice();
    SDL_VideoData *d = input->display;
    SDL_Window *window;
    struct zwp_relative_pointer_v1 *relative_pointer;

    if (!d->relative_pointer_manager)
        return -1;

    if (!d->pointer_constraints)
        return -1;

    if (!input->relative_pointer) {
        relative_pointer =
            zwp_relative_pointer_manager_v1_get_relative_pointer(
                d->relative_pointer_manager,
                input->pointer);
        zwp_relative_pointer_v1_add_listener(relative_pointer,
                                             &relative_pointer_listener,
                                             input);
        input->relative_pointer = relative_pointer;
    }

    for (window = vd->windows; window; window = window->next)
        lock_pointer_to_window(window, input);

    d->relative_mouse_mode = 1;

    return 0;
}

static int
MIR_ShowCursor(SDL_Cursor* cursor)
{
    MIR_Data* mir_data      = (MIR_Data*)SDL_GetVideoDevice()->driverdata;
    MIR_Window* mir_window  = mir_data->current_window;

    if (cursor && cursor->driverdata) {
        if (mir_window && MIR_mir_window_is_valid(mir_window->window)) {
            MIR_Cursor* mir_cursor = (MIR_Cursor*)cursor->driverdata;

            if (mir_cursor->name != NULL) {
                MirWindowSpec* spec = MIR_mir_create_window_spec(mir_data->connection);
                MIR_mir_window_spec_set_cursor_name(spec, mir_cursor->name);
                MIR_mir_window_apply_spec(mir_window->window, spec);
                MIR_mir_window_spec_release(spec);
            }

            if (mir_cursor->conf) {
                MIR_mir_window_configure_cursor(mir_window->window, mir_cursor->conf);
            }
        }
    }
    else if(mir_window && MIR_mir_window_is_valid(mir_window->window)) {
        MIR_mir_window_configure_cursor(mir_window->window, NULL);
    }

    return 0;
}

static SDL_Cursor*
MIR_CreateCursor(SDL_Surface* surface, int hot_x, int hot_y)
{
    MirCursorConfiguration* conf;
    MirBufferStream*        stream;

    int s_w = surface->w;
    int s_h = surface->h;

    MIR_Data* mir_data     = (MIR_Data*)SDL_GetVideoDevice()->driverdata;
    SDL_Cursor* cursor     = MIR_CreateDefaultCursor();
    MIR_Cursor* mir_cursor;

    if (!cursor) {
        return NULL;
    }

    mir_cursor = (MIR_Cursor*)cursor->driverdata;

    stream = MIR_mir_connection_create_buffer_stream_sync(mir_data->connection,
                                                          s_w, s_h, mir_data->pixel_format,
                                                          mir_buffer_usage_software);

    conf = MIR_mir_cursor_configuration_from_buffer_stream(stream, hot_x, hot_y);

    CopySurfacePixelsToMirStream(surface, stream);
    MIR_mir_buffer_stream_swap_buffers_sync(stream);

    mir_cursor->conf   = conf;
    mir_cursor->stream = stream;

    return cursor;
}

int
SDL_GetGammaRamp(Uint16 * red, Uint16 * green, Uint16 * blue)
{
    SDL_VideoDevice *_this = SDL_GetVideoDevice();
    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    return SDL_GetGammaRampForDisplay(SDL_CurrentDisplay, red, green, blue);
}

/* Run the system dependent event loops */
void SDL_PumpEvents(void)
{
    if (!SDL_EventThread) {
        SDL_VideoDevice *_this = SDL_GetVideoDevice();

        /* Get events from the video subsystem */
        if (_this) {
            _this->PumpEvents(_this);
        }
    }
}

static SDL_Cursor *
DirectFB_CreateDefaultCursor(void)
{
    SDL_VideoDevice *dev = SDL_GetVideoDevice();

    SDL_DFB_DEVICEDATA(dev);
    DFB_CursorData *curdata;
    DFBResult ret;
    DFBSurfaceDescription dsc;
    SDL_Cursor *cursor;
    Uint32 *dest;
    Uint32 *p;
    int pitch, i, j;

    SDL_DFB_ALLOC_CLEAR( cursor, sizeof(*cursor));
    SDL_DFB_ALLOC_CLEAR(curdata, sizeof(*curdata));

    dsc.flags =
        DSDESC_WIDTH | DSDESC_HEIGHT | DSDESC_PIXELFORMAT | DSDESC_CAPS;
    dsc.caps = DSCAPS_VIDEOONLY;
    dsc.width = 32;
    dsc.height = 32;
    dsc.pixelformat = DSPF_ARGB;

    SDL_DFB_CHECKERR(devdata->dfb->CreateSurface(devdata->dfb, &dsc,
                                                 &curdata->surf));
    curdata->hotx = 0;
    curdata->hoty = 0;
    cursor->driverdata = curdata;

    SDL_DFB_CHECKERR(curdata->surf->Lock(curdata->surf, DSLF_WRITE,
                                         (void *) &dest, &pitch));

    /* Relies on the fact that this is only called with ARGB surface. */
    for (i = 0; i < 32; i++)
    {
        for (j = 0; j < 32; j++)
        {
            switch (arrow[i][j])
            {
            case ' ': dest[j] = 0x00000000; break;
            case '.': dest[j] = 0xffffffff; break;
            case 'X': dest[j] = 0xff000000; break;
            }
        }
        dest += (pitch >> 2);
    }

    curdata->surf->Unlock(curdata->surf);
    return cursor;
  error:
    return NULL;
}

void AndroidPreCreateWindow() {
  // Apply scaler setting prior creating surface
  if (g_android_scaler_resolution.x() && g_android_scaler_resolution.y()) {
    // Initialize OpenGL function pointers inside SDL
    if (SDL_GL_LoadLibrary(NULL) < 0) {
      SDL_LogError(SDL_LOG_CATEGORY_ERROR,
                   "couldn't initialize OpenGL library\n");
    }

    // Hook eglCreateWindowSurface call
    SDL_VideoDevice* device = SDL_GetVideoDevice();
    device->egl_data->eglCreateWindowSurface = HookEglCreateWindowSurface;
  }
}

int
SDL_GetGammaRampForDisplay(SDL_VideoDisplay * display, Uint16 * red, Uint16 * green, Uint16 * blue)
{
    SDL_VideoDevice *_this = SDL_GetVideoDevice();

    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }

    /* Lazily allocate the gamma table */
    if (!display->gamma) {
        size_t rampsize = (3 * 256 * sizeof(*display->gamma));

        display->gamma = SDL_malloc(rampsize * 2);
        if (!display->gamma) {
            SDL_OutOfMemory();
            return -1;
        }
        if (_this && _this->GetDisplayGammaRamp) {
            /* Get the real hardware gamma */
            _this->GetDisplayGammaRamp(_this, display, display->gamma);
        } else {
            /* Assume an identity gamma */
            int i;
            for (i = 0; i < 256; ++i) {
                display->gamma[0 * 256 + i] = (i << 8) | i;
                display->gamma[1 * 256 + i] = (i << 8) | i;
                display->gamma[2 * 256 + i] = (i << 8) | i;
            }
        }
        display->saved_gamma = display->gamma + (3 * 256);
        SDL_memcpy(display->saved_gamma, display->gamma, rampsize);
    }

    /* Just copy from our internal table */
    if (red) {
        SDL_memcpy(red, &display->gamma[0 * 256], 256 * sizeof(*red));
    }
    if (green) {
        SDL_memcpy(green, &display->gamma[1 * 256], 256 * sizeof(*green));
    }
    if (blue) {
        SDL_memcpy(blue, &display->gamma[2 * 256], 256 * sizeof(*blue));
    }
    return 0;
}

/* Create a cursor from a surface */
static SDL_Cursor *
DirectFB_CreateCursor(SDL_Surface * surface, int hot_x, int hot_y)
{
    SDL_VideoDevice *dev = SDL_GetVideoDevice();

    SDL_DFB_DEVICEDATA(dev);
    DFB_CursorData *curdata;
    DFBResult ret;
    DFBSurfaceDescription dsc;
    SDL_Cursor *cursor;
    Uint32 *dest;
    Uint32 *p;
    int pitch, i;

    SDL_assert(surface->format->format == SDL_PIXELFORMAT_ARGB8888);
    SDL_assert(surface->pitch == surface->w * 4);

    SDL_DFB_ALLOC_CLEAR( cursor, sizeof(*cursor));
    SDL_DFB_ALLOC_CLEAR(curdata, sizeof(*curdata));

    dsc.flags =
        DSDESC_WIDTH | DSDESC_HEIGHT | DSDESC_PIXELFORMAT | DSDESC_CAPS;
    dsc.caps = DSCAPS_VIDEOONLY;
    dsc.width = surface->w;
    dsc.height = surface->h;
    dsc.pixelformat = DSPF_ARGB;

    SDL_DFB_CHECKERR(devdata->dfb->CreateSurface(devdata->dfb, &dsc,
                                                 &curdata->surf));
    curdata->hotx = hot_x;
    curdata->hoty = hot_y;
    cursor->driverdata = curdata;

    SDL_DFB_CHECKERR(curdata->surf->Lock(curdata->surf, DSLF_WRITE,
                                         (void *) &dest, &pitch));

    p = surface->pixels;
    for (i = 0; i < surface->h; i++)
        memcpy((char *) dest + i * pitch,
               (char *) p + i * surface->pitch, 4 * surface->w);

    curdata->surf->Unlock(curdata->surf);
    return cursor;
  error:
    return NULL;
}

void
SDL_MoveCursor(int x, int y)
{
    SDL_VideoDevice *_this = SDL_GetVideoDevice();

    /* Erase and update the current mouse position */
    if (SHOULD_DRAWCURSOR(SDL_cursorstate)) {
        /* Erase and redraw mouse cursor in new position */
        SDL_LockCursor();
        SDL_EraseCursor(SDL_VideoSurface);
        SDL_cursor->area.x = (x - SDL_cursor->hot_x);
        SDL_cursor->area.y = (y - SDL_cursor->hot_y);
        SDL_DrawCursor(SDL_VideoSurface);
        SDL_UnlockCursor();
    } else if (_this->MoveWMCursor) {
        _this->MoveWMCursor(_this, x, y);
    }
}

/* Run the system dependent event loops */
void
SDL_PumpEvents(void)
{
    if (!SDL_EventThread) {
        SDL_VideoDevice *_this = SDL_GetVideoDevice();

        /* Get events from the video subsystem */
        if (_this) {
            _this->PumpEvents(_this);
        }
#if !SDL_JOYSTICK_DISABLED
        /* Check for joystick state change */
        if (SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK)) {
            SDL_JoystickUpdate();
        }
#endif
    }
}

void
Android_SetScreenResolution(int width, int height, Uint32 format, float rate)
{
	static int times = 0;
	posix_print("#%i, Android_SetScreenResolution------(%ix%i), format: 0x%08x, rate: %7.2f, Android_Window: %p\n", 
		times, width, height, format, rate, Android_Window);

	SDL_VideoDevice* device;
	SDL_VideoDisplay *display;
    Android_ScreenWidth = width;
    Android_ScreenHeight = height;
    Android_ScreenFormat = format;
    Android_ScreenRate = rate;

    /*
      Update the resolution of the desktop mode, so that the window
      can be properly resized. The screen resolution change can for
      example happen when the Activity enters or exists immersive mode,
      which can happen after VideoInit().
    */
    device = SDL_GetVideoDevice();
    if (device && device->num_displays > 0)
    {
        display = &device->displays[0];
        display->desktop_mode.format = Android_ScreenFormat;
        display->desktop_mode.w = Android_ScreenWidth;
        display->desktop_mode.h = Android_ScreenHeight;
        display->desktop_mode.refresh_rate  = Android_ScreenRate;
    }

    if (Android_Window) {
        SDL_SendWindowEvent(Android_Window, SDL_WINDOWEVENT_RESIZED, width, height);

        /* Force the current mode to match the resize otherwise the SDL_WINDOWEVENT_RESTORED event
         * will fall back to the old mode */
        display = SDL_GetDisplayForWindow(Android_Window);

        display->current_mode.format = format;
        display->current_mode.w = width;
        display->current_mode.h = height;
        display->current_mode.refresh_rate = rate;
    }
	times ++;
}