/*
  * GDI video grab interface
  *
  * This file is part of FFmpeg.
  *
  * Copyright (C) 2013 Calvin Walton <calvin.walton@kepstin.ca>
  * Copyright (C) 2007-2010 Christophe Gisquet <word1.word2@gmail.com>
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public License
  * as published by the Free Software Foundation; either version 2.1
  * of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
  * @file
  * GDI frame device demuxer
  * @author Calvin Walton <calvin.walton@kepstin.ca>
  * @author Christophe Gisquet <word1.word2@gmail.com>
  */
 
 #include "config.h"
 #include "libavformat/internal.h"
 #include "libavutil/opt.h"
 #include "libavutil/time.h"
 #include <windows.h>
 
 /**
  * GDI Device Demuxer context
  */
 struct gdigrab {
     const AVClass *class;   /**< Class for private options */
 
     int        frame_size;  /**< Size in bytes of the frame pixel data */
     int        header_size; /**< Size in bytes of the DIB header */
     AVRational time_base;   /**< Time base */
     int64_t    time_frame;  /**< Current time */
 
     int        draw_mouse;  /**< Draw mouse cursor (private option) */
     int        show_region; /**< Draw border (private option) */
     AVRational framerate;   /**< Capture framerate (private option) */
     int        width;       /**< Width of the grab frame (private option) */
     int        height;      /**< Height of the grab frame (private option) */
     int        offset_x;    /**< Capture x offset (private option) */
     int        offset_y;    /**< Capture y offset (private option) */
 
     HWND       hwnd;        /**< Handle of the window for the grab */
     HDC        source_hdc;  /**< Source device context */
     HDC        dest_hdc;    /**< Destination, source-compatible DC */
     BITMAPINFO bmi;         /**< Information describing DIB format */
     HBITMAP    hbmp;        /**< Information on the bitmap captured */
     void      *buffer;      /**< The buffer containing the bitmap image data */
     RECT       clip_rect;   /**< The subarea of the screen or window to clip */
 
     HWND       region_hwnd; /**< Handle of the region border window */
 
     int cursor_error_printed;
 };
 
 #define WIN32_API_ERROR(str)                                            \
     av_log(s1, AV_LOG_ERROR, str " (error %li)\n", GetLastError())
 
 #define REGION_WND_BORDER 3
 
 /**
  * Callback to handle Windows messages for the region outline window.
  *
  * In particular, this handles painting the frame rectangle.
  *
  * @param hwnd The region outline window handle.
  * @param msg The Windows message.
  * @param wparam First Windows message parameter.
  * @param lparam Second Windows message parameter.
  * @return 0 success, !0 failure
  */
 static LRESULT CALLBACK
 gdigrab_region_wnd_proc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
 {
     PAINTSTRUCT ps;
     HDC hdc;
     RECT rect;
 
     switch (msg) {
     case WM_PAINT:
         hdc = BeginPaint(hwnd, &ps);
 
         GetClientRect(hwnd, &rect);
         FrameRect(hdc, &rect, GetStockObject(BLACK_BRUSH));
 
         rect.left++; rect.top++; rect.right--; rect.bottom--;
         FrameRect(hdc, &rect, GetStockObject(WHITE_BRUSH));
 
         rect.left++; rect.top++; rect.right--; rect.bottom--;
         FrameRect(hdc, &rect, GetStockObject(BLACK_BRUSH));
 
         EndPaint(hwnd, &ps);
         break;
     default:
         return DefWindowProc(hwnd, msg, wparam, lparam);
     }
     return 0;
 }
 
 /**
  * Initialize the region outline window.
  *
  * @param s1 The format context.
  * @param gdigrab gdigrab context.
  * @return 0 success, !0 failure
  */
 static int
 gdigrab_region_wnd_init(AVFormatContext *s1, struct gdigrab *gdigrab)
 {
     HWND hwnd;
     RECT rect = gdigrab->clip_rect;
     HRGN region = NULL;
     HRGN region_interior = NULL;
 
     DWORD style = WS_POPUP | WS_VISIBLE;
     DWORD ex = WS_EX_TOOLWINDOW | WS_EX_TOPMOST | WS_EX_TRANSPARENT;
 
     rect.left -= REGION_WND_BORDER; rect.top -= REGION_WND_BORDER;
     rect.right += REGION_WND_BORDER; rect.bottom += REGION_WND_BORDER;
 
     AdjustWindowRectEx(&rect, style, FALSE, ex);
 
     // Create a window with no owner; use WC_DIALOG instead of writing a custom
     // window class
     hwnd = CreateWindowEx(ex, WC_DIALOG, NULL, style, rect.left, rect.top,
             rect.right - rect.left, rect.bottom - rect.top,
             NULL, NULL, NULL, NULL);
     if (!hwnd) {
         WIN32_API_ERROR("Could not create region display window");
         goto error;
     }
 
     // Set the window shape to only include the border area
     GetClientRect(hwnd, &rect);
     region = CreateRectRgn(0, 0,
             rect.right - rect.left, rect.bottom - rect.top);
     region_interior = CreateRectRgn(REGION_WND_BORDER, REGION_WND_BORDER,
             rect.right - rect.left - REGION_WND_BORDER,
             rect.bottom - rect.top - REGION_WND_BORDER);
     CombineRgn(region, region, region_interior, RGN_DIFF);
     if (!SetWindowRgn(hwnd, region, FALSE)) {
         WIN32_API_ERROR("Could not set window region");
         goto error;
     }
     // The "region" memory is now owned by the window
     region = NULL;
     DeleteObject(region_interior);
 
     SetWindowLongPtr(hwnd, GWLP_WNDPROC, (LONG_PTR) gdigrab_region_wnd_proc);
 
     ShowWindow(hwnd, SW_SHOW);
 
     gdigrab->region_hwnd = hwnd;
 
     return 0;
 
 error:
     if (region)
         DeleteObject(region);
     if (region_interior)
         DeleteObject(region_interior);
     if (hwnd)
         DestroyWindow(hwnd);
     return 1;
 }
 
 /**
  * Cleanup/free the region outline window.
  *
  * @param s1 The format context.
  * @param gdigrab gdigrab context.
  */
 static void
 gdigrab_region_wnd_destroy(AVFormatContext *s1, struct gdigrab *gdigrab)
 {
     if (gdigrab->region_hwnd)
         DestroyWindow(gdigrab->region_hwnd);
     gdigrab->region_hwnd = NULL;
 }
 
 /**
  * Process the Windows message queue.
  *
  * This is important to prevent Windows from thinking the window has become
  * unresponsive. As well, things like WM_PAINT (to actually draw the window
  * contents) are handled from the message queue context.
  *
  * @param s1 The format context.
  * @param gdigrab gdigrab context.
  */
 static void
 gdigrab_region_wnd_update(AVFormatContext *s1, struct gdigrab *gdigrab)
 {
     HWND hwnd = gdigrab->region_hwnd;
     MSG msg;
 
     while (PeekMessage(&msg, hwnd, 0, 0, PM_REMOVE)) {
         DispatchMessage(&msg);
     }
 }
 
 /**
  * Initializes the gdi grab device demuxer (public device demuxer API).
  *
  * @param s1 Context from avformat core
  * @return AVERROR_IO error, 0 success
  */
 static int
 gdigrab_read_header(AVFormatContext *s1)
 {
     struct gdigrab *gdigrab = s1->priv_data;
 
     HWND hwnd;
     HDC source_hdc = NULL;
     HDC dest_hdc   = NULL;
     BITMAPINFO bmi;
     HBITMAP hbmp   = NULL;
     void *buffer   = NULL;
 
     const char *filename = s1->filename;
     const char *name     = NULL;
     AVStream   *st       = NULL;
 
     int bpp;

     int vertres;
     int desktopvertres;

     RECT virtual_rect;
     RECT clip_rect;
     BITMAP bmp;
     int ret;
 
     if (!strncmp(filename, "title=", 6)) {
         name = filename + 6;
         hwnd = FindWindow(NULL, name);
         if (!hwnd) {
             av_log(s1, AV_LOG_ERROR,
                    "Can't find window '%s', aborting.\n", name);
             ret = AVERROR(EIO);
             goto error;
         }
         if (gdigrab->show_region) {
             av_log(s1, AV_LOG_WARNING,
                     "Can't show region when grabbing a window.\n");
             gdigrab->show_region = 0;
         }
     } else if (!strcmp(filename, "desktop")) {
         hwnd = NULL;
     } else {
         av_log(s1, AV_LOG_ERROR,
                "Please use \"desktop\" or \"title=<windowname>\" to specify your target.\n");
         ret = AVERROR(EIO);
         goto error;
     }
 

     /* This will get the device context for the selected window, or if
      * none, the primary screen */
     source_hdc = GetDC(hwnd);
     if (!source_hdc) {
         WIN32_API_ERROR("Couldn't get window device context");
         ret = AVERROR(EIO);
         goto error;
     }
     bpp = GetDeviceCaps(source_hdc, BITSPIXEL);
 

     if (hwnd) {
         GetClientRect(hwnd, &virtual_rect);
     } else {

         /* desktop -- get the right height and width for scaling DPI */
         vertres = GetDeviceCaps(source_hdc, VERTRES);
         desktopvertres = GetDeviceCaps(source_hdc, DESKTOPVERTRES);

         virtual_rect.left = GetSystemMetrics(SM_XVIRTUALSCREEN);
         virtual_rect.top = GetSystemMetrics(SM_YVIRTUALSCREEN);

         virtual_rect.right = (virtual_rect.left + GetSystemMetrics(SM_CXVIRTUALSCREEN)) * desktopvertres / vertres;
         virtual_rect.bottom = (virtual_rect.top + GetSystemMetrics(SM_CYVIRTUALSCREEN)) * desktopvertres / vertres;

     }
 
     /* If no width or height set, use full screen/window area */
     if (!gdigrab->width || !gdigrab->height) {
         clip_rect.left = virtual_rect.left;
         clip_rect.top = virtual_rect.top;
         clip_rect.right = virtual_rect.right;
         clip_rect.bottom = virtual_rect.bottom;
     } else {
         clip_rect.left = gdigrab->offset_x;
         clip_rect.top = gdigrab->offset_y;
         clip_rect.right = gdigrab->width + gdigrab->offset_x;
         clip_rect.bottom = gdigrab->height + gdigrab->offset_y;
     }
 
     if (clip_rect.left < virtual_rect.left ||
             clip_rect.top < virtual_rect.top ||
             clip_rect.right > virtual_rect.right ||
             clip_rect.bottom > virtual_rect.bottom) {
             av_log(s1, AV_LOG_ERROR,
                     "Capture area (%li,%li),(%li,%li) extends outside window area (%li,%li),(%li,%li)",
                     clip_rect.left, clip_rect.top,
                     clip_rect.right, clip_rect.bottom,
                     virtual_rect.left, virtual_rect.top,
                     virtual_rect.right, virtual_rect.bottom);
             ret = AVERROR(EIO);
             goto error;
     }
 
 
     if (name) {
         av_log(s1, AV_LOG_INFO,
                "Found window %s, capturing %lix%lix%i at (%li,%li)\n",
                name,
                clip_rect.right - clip_rect.left,
                clip_rect.bottom - clip_rect.top,
                bpp, clip_rect.left, clip_rect.top);
     } else {
         av_log(s1, AV_LOG_INFO,
                "Capturing whole desktop as %lix%lix%i at (%li,%li)\n",
                clip_rect.right - clip_rect.left,
                clip_rect.bottom - clip_rect.top,
                bpp, clip_rect.left, clip_rect.top);
     }
 
     if (clip_rect.right - clip_rect.left <= 0 ||
             clip_rect.bottom - clip_rect.top <= 0 || bpp%8) {
         av_log(s1, AV_LOG_ERROR, "Invalid properties, aborting\n");
         ret = AVERROR(EIO);
         goto error;
     }
 
     dest_hdc = CreateCompatibleDC(source_hdc);
     if (!dest_hdc) {
         WIN32_API_ERROR("Screen DC CreateCompatibleDC");
         ret = AVERROR(EIO);
         goto error;
     }
 
     /* Create a DIB and select it into the dest_hdc */
     bmi.bmiHeader.biSize          = sizeof(BITMAPINFOHEADER);
     bmi.bmiHeader.biWidth         = clip_rect.right - clip_rect.left;
     bmi.bmiHeader.biHeight        = -(clip_rect.bottom - clip_rect.top);
     bmi.bmiHeader.biPlanes        = 1;
     bmi.bmiHeader.biBitCount      = bpp;
     bmi.bmiHeader.biCompression   = BI_RGB;
     bmi.bmiHeader.biSizeImage     = 0;
     bmi.bmiHeader.biXPelsPerMeter = 0;
     bmi.bmiHeader.biYPelsPerMeter = 0;
     bmi.bmiHeader.biClrUsed       = 0;
     bmi.bmiHeader.biClrImportant  = 0;
     hbmp = CreateDIBSection(dest_hdc, &bmi, DIB_RGB_COLORS,
             &buffer, NULL, 0);
     if (!hbmp) {
         WIN32_API_ERROR("Creating DIB Section");
         ret = AVERROR(EIO);
         goto error;
     }
 
     if (!SelectObject(dest_hdc, hbmp)) {
         WIN32_API_ERROR("SelectObject");
         ret = AVERROR(EIO);
         goto error;
     }
 
     /* Get info from the bitmap */
     GetObject(hbmp, sizeof(BITMAP), &bmp);
 
     st = avformat_new_stream(s1, NULL);
     if (!st) {
         ret = AVERROR(ENOMEM);
         goto error;
     }
     avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
 
     gdigrab->frame_size  = bmp.bmWidthBytes * bmp.bmHeight * bmp.bmPlanes;
     gdigrab->header_size = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) +
                            (bpp <= 8 ? (1 << bpp) : 0) * sizeof(RGBQUAD) /* palette size */;
     gdigrab->time_base   = av_inv_q(gdigrab->framerate);
     gdigrab->time_frame  = av_gettime() / av_q2d(gdigrab->time_base);
 
     gdigrab->hwnd       = hwnd;
     gdigrab->source_hdc = source_hdc;
     gdigrab->dest_hdc   = dest_hdc;
     gdigrab->hbmp       = hbmp;
     gdigrab->bmi        = bmi;
     gdigrab->buffer     = buffer;
     gdigrab->clip_rect  = clip_rect;
 
     gdigrab->cursor_error_printed = 0;
 
     if (gdigrab->show_region) {
         if (gdigrab_region_wnd_init(s1, gdigrab)) {
             ret = AVERROR(EIO);
             goto error;
         }
     }
 

     st->avg_frame_rate = av_inv_q(gdigrab->time_base);
 
     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
     st->codecpar->codec_id   = AV_CODEC_ID_BMP;
     st->codecpar->bit_rate   = (gdigrab->header_size + gdigrab->frame_size) * 1/av_q2d(gdigrab->time_base) * 8;

 
     return 0;
 
 error:
     if (source_hdc)
         ReleaseDC(hwnd, source_hdc);
     if (dest_hdc)
         DeleteDC(dest_hdc);
     if (hbmp)
         DeleteObject(hbmp);
     if (source_hdc)
         DeleteDC(source_hdc);
     return ret;
 }
 
 /**
  * Paints a mouse pointer in a Win32 image.
  *
  * @param s1 Context of the log information
  * @param s  Current grad structure
  */
 static void paint_mouse_pointer(AVFormatContext *s1, struct gdigrab *gdigrab)
 {
     CURSORINFO ci = {0};
 
 #define CURSOR_ERROR(str)                 \
     if (!gdigrab->cursor_error_printed) {       \
         WIN32_API_ERROR(str);             \
         gdigrab->cursor_error_printed = 1;      \
     }
 
     ci.cbSize = sizeof(ci);
 
     if (GetCursorInfo(&ci)) {
         HCURSOR icon = CopyCursor(ci.hCursor);
         ICONINFO info;
         POINT pos;
         RECT clip_rect = gdigrab->clip_rect;
         HWND hwnd = gdigrab->hwnd;

         int vertres = GetDeviceCaps(gdigrab->source_hdc, VERTRES);
         int desktopvertres = GetDeviceCaps(gdigrab->source_hdc, DESKTOPVERTRES);

         info.hbmMask = NULL;
         info.hbmColor = NULL;

 
         if (ci.flags != CURSOR_SHOWING)
             return;
 
         if (!icon) {
             /* Use the standard arrow cursor as a fallback.
              * You'll probably only hit this in Wine, which can't fetch
              * the current system cursor. */
             icon = CopyCursor(LoadCursor(NULL, IDC_ARROW));
         }
 
         if (!GetIconInfo(icon, &info)) {
             CURSOR_ERROR("Could not get icon info");
             goto icon_error;
         }
 
         pos.x = ci.ptScreenPos.x - clip_rect.left - info.xHotspot;
         pos.y = ci.ptScreenPos.y - clip_rect.top - info.yHotspot;
 
         if (hwnd) {
             RECT rect;
 
             if (GetWindowRect(hwnd, &rect)) {
                 pos.x -= rect.left;
                 pos.y -= rect.top;
             } else {
                 CURSOR_ERROR("Couldn't get window rectangle");
                 goto icon_error;
             }
         }
 

         //that would keep the correct location of mouse with hidpi screens
         pos.x = pos.x * desktopvertres / vertres;
         pos.y = pos.y * desktopvertres / vertres;
 

         av_log(s1, AV_LOG_DEBUG, "Cursor pos (%li,%li) -> (%li,%li)\n",
                 ci.ptScreenPos.x, ci.ptScreenPos.y, pos.x, pos.y);
 
         if (pos.x >= 0 && pos.x <= clip_rect.right - clip_rect.left &&
                 pos.y >= 0 && pos.y <= clip_rect.bottom - clip_rect.top) {
             if (!DrawIcon(gdigrab->dest_hdc, pos.x, pos.y, icon))
                 CURSOR_ERROR("Couldn't draw icon");
         }
 
 icon_error:

         if (info.hbmMask)
             DeleteObject(info.hbmMask);
         if (info.hbmColor)
             DeleteObject(info.hbmColor);

         if (icon)
             DestroyCursor(icon);
     } else {
         CURSOR_ERROR("Couldn't get cursor info");
     }
 }
 
 /**
  * Grabs a frame from gdi (public device demuxer API).
  *
  * @param s1 Context from avformat core
  * @param pkt Packet holding the grabbed frame
  * @return frame size in bytes
  */
 static int gdigrab_read_packet(AVFormatContext *s1, AVPacket *pkt)
 {
     struct gdigrab *gdigrab = s1->priv_data;
 
     HDC        dest_hdc   = gdigrab->dest_hdc;
     HDC        source_hdc = gdigrab->source_hdc;
     RECT       clip_rect  = gdigrab->clip_rect;
     AVRational time_base  = gdigrab->time_base;
     int64_t    time_frame = gdigrab->time_frame;
 
     BITMAPFILEHEADER bfh;
     int file_size = gdigrab->header_size + gdigrab->frame_size;
 
     int64_t curtime, delay;
 
     /* Calculate the time of the next frame */
     time_frame += INT64_C(1000000);
 
     /* Run Window message processing queue */
     if (gdigrab->show_region)
         gdigrab_region_wnd_update(s1, gdigrab);
 
     /* wait based on the frame rate */
     for (;;) {
         curtime = av_gettime();
         delay = time_frame * av_q2d(time_base) - curtime;
         if (delay <= 0) {
             if (delay < INT64_C(-1000000) * av_q2d(time_base)) {
                 time_frame += INT64_C(1000000);
             }
             break;
         }
         if (s1->flags & AVFMT_FLAG_NONBLOCK) {
             return AVERROR(EAGAIN);
         } else {
             av_usleep(delay);
         }
     }
 
     if (av_new_packet(pkt, file_size) < 0)
         return AVERROR(ENOMEM);
     pkt->pts = curtime;
 
     /* Blit screen grab */
     if (!BitBlt(dest_hdc, 0, 0,
                 clip_rect.right - clip_rect.left,
                 clip_rect.bottom - clip_rect.top,
                 source_hdc,
                 clip_rect.left, clip_rect.top, SRCCOPY | CAPTUREBLT)) {
         WIN32_API_ERROR("Failed to capture image");
         return AVERROR(EIO);
     }
     if (gdigrab->draw_mouse)
         paint_mouse_pointer(s1, gdigrab);
 
     /* Copy bits to packet data */
 
     bfh.bfType = 0x4d42; /* "BM" in little-endian */
     bfh.bfSize = file_size;
     bfh.bfReserved1 = 0;
     bfh.bfReserved2 = 0;
     bfh.bfOffBits = gdigrab->header_size;
 
     memcpy(pkt->data, &bfh, sizeof(bfh));
 
     memcpy(pkt->data + sizeof(bfh), &gdigrab->bmi.bmiHeader, sizeof(gdigrab->bmi.bmiHeader));
 
     if (gdigrab->bmi.bmiHeader.biBitCount <= 8)
         GetDIBColorTable(dest_hdc, 0, 1 << gdigrab->bmi.bmiHeader.biBitCount,
                 (RGBQUAD *) (pkt->data + sizeof(bfh) + sizeof(gdigrab->bmi.bmiHeader)));
 
     memcpy(pkt->data + gdigrab->header_size, gdigrab->buffer, gdigrab->frame_size);
 
     gdigrab->time_frame = time_frame;
 
     return gdigrab->header_size + gdigrab->frame_size;
 }
 
 /**
  * Closes gdi frame grabber (public device demuxer API).
  *
  * @param s1 Context from avformat core
  * @return 0 success, !0 failure
  */
 static int gdigrab_read_close(AVFormatContext *s1)
 {
     struct gdigrab *s = s1->priv_data;
 
     if (s->show_region)
         gdigrab_region_wnd_destroy(s1, s);
 
     if (s->source_hdc)
         ReleaseDC(s->hwnd, s->source_hdc);
     if (s->dest_hdc)
         DeleteDC(s->dest_hdc);
     if (s->hbmp)
         DeleteObject(s->hbmp);
     if (s->source_hdc)
         DeleteDC(s->source_hdc);
 
     return 0;
 }
 
 #define OFFSET(x) offsetof(struct gdigrab, x)
 #define DEC AV_OPT_FLAG_DECODING_PARAM
 static const AVOption options[] = {
     { "draw_mouse", "draw the mouse pointer", OFFSET(draw_mouse), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, DEC },
     { "show_region", "draw border around capture area", OFFSET(show_region), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },

     { "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "ntsc"}, 0, INT_MAX, DEC },

     { "video_size", "set video frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
     { "offset_x", "capture area x offset", OFFSET(offset_x), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
     { "offset_y", "capture area y offset", OFFSET(offset_y), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
     { NULL },
 };
 
 static const AVClass gdigrab_class = {
     .class_name = "GDIgrab indev",
     .item_name  = av_default_item_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 
 /** gdi grabber device demuxer declaration */
 AVInputFormat ff_gdigrab_demuxer = {
     .name           = "gdigrab",
     .long_name      = NULL_IF_CONFIG_SMALL("GDI API Windows frame grabber"),
     .priv_data_size = sizeof(struct gdigrab),
     .read_header    = gdigrab_read_header,
     .read_packet    = gdigrab_read_packet,
     .read_close     = gdigrab_read_close,
     .flags          = AVFMT_NOFILE,
     .priv_class     = &gdigrab_class,
 };