Adding upstream version 2.10.34.upstream/2.10.34upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1317 insertions, 0 deletions

diff --git a/plug-ins/screenshot/screenshot-win32.c b/plug-ins/screenshot/screenshot-win32.c
new file mode 100644
index 0000000..ff8cbc4
--- /dev/null
+++ b/plug-ins/screenshot/screenshot-win32.c
@@ -0,0 +1,1317 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * Screenshot plug-in
+ * Copyright 1998-2007 Sven Neumann <sven@gimp.org>
+ * Copyright 2003      Henrik Brix Andersen <brix@gimp.org>
+ * Copyright 2012      Simone Karin Lehmann - OS X patches
+ * Copyright 2018      Gil Eliyahu <gileli121@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <glib.h>
+
+#ifdef G_OS_WIN32
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Necessary in order to have SetProcessDPIAware() defined.
+ * This value of _WIN32_WINNT corresponds to Windows 7, which is our
+ * minimum supported platform.
+ */
+#ifdef _WIN32_WINNT
+#undef _WIN32_WINNT
+#endif
+#define _WIN32_WINNT 0x0601
+#include <windows.h>
+
+#include <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+#include "screenshot.h"
+#include "screenshot-win32.h"
+#include "screenshot-win32-resource.h"
+
+#include "libgimp/stdplugins-intl.h"
+#include "screenshot-win32-magnification-api.h"
+#include "screenshot-win32-dwm-api.h"
+
+/*
+ * Application definitions
+ */
+#define SELECT_FRAME    0
+#define SELECT_CLIENT   1
+#define SELECT_WINDOW   2
+
+#define SHOW_WINDOW     FALSE
+#define APP_NAME        "plug_in_screenshot_win"
+#define WM_DOCAPTURE    (WM_USER + 100)
+
+/* Prototypes */
+void setCaptureType  (int       capType);
+BOOL InitApplication (HINSTANCE hInstance);
+BOOL InitInstance    (HINSTANCE hInstance,
+                      int       nCmdShow);
+int  winsnapWinMain  (void);
+
+/* File variables */
+static int             captureType;
+static char            buffer[512];
+static guchar         *capBytes = NULL;
+static HWND            mainHwnd = NULL;
+static HINSTANCE       hInst = NULL;
+static HCURSOR         selectCursor = 0;
+static ICONINFO        iconInfo;
+static MAGIMAGEHEADER  returnedSrcheader;
+static int             rectScreensCount = 0;
+
+static gint32         *image_id;
+static gboolean        capturePointer = FALSE;
+
+static void sendBMPToGimp                      (HBITMAP         hBMP,
+                                                HDC             hDC,
+                                                RECT            rect);
+static int      doWindowCapture                    (void);
+static gboolean doCapture                          (HWND            selectedHwnd);
+static BOOL     isWindowIsAboveCaptureRegion       (HWND            hwndWindow,
+                                                    RECT            rectCapture);
+static gboolean doCaptureMagnificationAPI          (HWND            selectedHwnd,
+                                                    RECT            rect);
+static void     doCaptureMagnificationAPI_callback (HWND            hwnd,
+                                                    void           *srcdata,
+                                                    MAGIMAGEHEADER  srcheader,
+                                                    void           *destdata,
+                                                    MAGIMAGEHEADER  destheader,
+                                                    RECT            unclipped,
+                                                    RECT            clipped,
+                                                    HRGN            dirty);
+static gboolean doCaptureBitBlt                    (HWND            selectedHwnd,
+                                                    RECT            rect);
+
+BOOL CALLBACK dialogProc (HWND, UINT, WPARAM, LPARAM);
+LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
+
+gboolean isDwmCompositionEnabled (void);
+
+/* Data structure holding data between runs */
+typedef struct {
+  gint root;
+  guint delay;
+  gint decor;
+} WinSnapValues;
+
+/* Default WinSnap values */
+static WinSnapValues winsnapvals =
+{
+  FALSE,
+  0,
+  TRUE,
+};
+
+/* The dialog information */
+typedef struct {
+#ifdef CAN_SET_DECOR
+  GtkWidget *decor_button;
+#endif
+  GtkWidget *single_button;
+  GtkWidget *root_button;
+  GtkWidget *delay_spinner;
+} WinSnapInterface;
+
+/* We create a DIB section to hold the grabbed area. The scanlines in
+ * DIB sections are aligned on a LONG (four byte) boundary. Its pixel
+ * data is in RGB (BGR actually) format, three bytes per pixel.
+ *
+ * GIMP uses no alignment for its pixel regions. The GIMP image we
+ * create is of type RGB, i.e. three bytes per pixel, too. Thus in
+ * order to be able to quickly transfer all of the image at a time, we
+ * must use a DIB section and pixel region the scanline width in
+ * bytes of which is evenly divisible with both 3 and 4. I.e. it must
+ * be a multiple of 12 bytes, or in pixels, a multiple of four pixels.
+ */
+
+#define ROUND4(width) (((width-1)/4+1)*4)
+
+
+gboolean
+screenshot_win32_available (void)
+{
+  return TRUE;
+}
+
+ScreenshotCapabilities
+screenshot_win32_get_capabilities (void)
+{
+  return (SCREENSHOT_CAN_SHOOT_DECORATIONS |
+          SCREENSHOT_CAN_SHOOT_WINDOW      |
+          SCREENSHOT_CAN_SHOOT_POINTER);
+}
+
+GimpPDBStatusType
+screenshot_win32_shoot (ScreenshotValues  *shootvals,
+                        GdkScreen         *screen,
+                        gint32            *image_ID,
+                        GError           **error)
+{
+  GimpPDBStatusType status = GIMP_PDB_EXECUTION_ERROR;
+
+  /* leave "shootvals->monitor" alone until somebody patches the code
+   * to be able to get a monitor's color profile
+   */
+
+  image_id = image_ID;
+
+  winsnapvals.delay = shootvals->screenshot_delay;
+  capturePointer = shootvals->show_cursor;
+
+  if (shootvals->shoot_type == SHOOT_ROOT)
+    {
+      doCapture (0);
+
+      status = GIMP_PDB_SUCCESS;
+    }
+  else if (shootvals->shoot_type == SHOOT_WINDOW)
+    {
+      status = 0 == doWindowCapture () ? GIMP_PDB_CANCEL : GIMP_PDB_SUCCESS;
+    }
+  else if (shootvals->shoot_type == SHOOT_REGION)
+    {
+      /* FIXME */
+    }
+
+  if (status == GIMP_PDB_SUCCESS)
+    {
+      GimpColorProfile *profile;
+
+      /* XXX No idea if the "monitor" value is right at all, especially
+       * considering above comment. Just make so that it at least
+       * compiles!
+       */
+      profile = gimp_screen_get_color_profile (screen, shootvals->monitor);
+
+      if (profile)
+        {
+          gimp_image_set_color_profile (*image_ID, profile);
+          g_object_unref (profile);
+        }
+    }
+
+  return status;
+}
+
+
+
+
+
+/******************************************************************
+ * GIMP format and transfer functions
+ ******************************************************************/
+
+/*
+ * flipRedAndBlueBytes
+ *
+ * Microsoft has chosen to provide us a very nice (not!)
+ * interface for retrieving bitmap bits.  DIBSections have
+ * RGB information as BGR instead.  So, we have to swap
+ * the silly red and blue bytes before sending to the
+ * GIMP.
+ */
+static void
+flipRedAndBlueBytes (int width,
+                     int height)
+{
+  int      i, j;
+  guchar  *bufp;
+  guchar   temp;
+
+  j = 0;
+  while (j < height) {
+    i = width;
+    bufp = capBytes + j*ROUND4(width)*3;
+    while (i--) {
+      temp = bufp[2];
+      bufp[2] = bufp[0];
+      bufp[0] = temp;
+      bufp += 3;
+    }
+    j++;
+  }
+}
+
+/*
+ * rgbaToRgbBytes
+ *
+ * Convert rgba array to rgb array
+ */
+static void
+rgbaToRgbBytes (guchar *rgbBufp,
+                guchar *rgbaBufp,
+                int     rgbaBufSize)
+{
+  int rgbPoint = 0, rgbaPoint;
+
+  for (rgbaPoint = 0; rgbaPoint < rgbaBufSize; rgbaPoint += 4)
+    {
+      rgbBufp[rgbPoint++] = rgbaBufp[rgbaPoint];
+      rgbBufp[rgbPoint++] = rgbaBufp[rgbaPoint + 1];
+      rgbBufp[rgbPoint++] = rgbaBufp[rgbaPoint + 2];
+    }
+}
+
+/*
+ * sendBMPToGIMP
+ *
+ * Take the captured data and send it across
+ * to GIMP.
+ */
+static void
+sendBMPToGimp (HBITMAP hBMP,
+               HDC     hDC,
+               RECT    rect)
+{
+  int            width, height;
+  int            imageType, layerType;
+  gint32         new_image_id;
+  gint32         layer_id;
+  GeglBuffer    *buffer;
+  GeglRectangle *rectangle;
+
+  /* Our width and height */
+  width = (rect.right - rect.left);
+  height = (rect.bottom - rect.top);
+
+  /* Check that we got the memory */
+  if (!capBytes)
+    {
+      g_message (_("No data captured"));
+      return;
+    }
+
+  /* Flip the red and blue bytes */
+  flipRedAndBlueBytes (width, height);
+
+  /* Set up the image and layer types */
+  imageType = GIMP_RGB;
+  layerType = GIMP_RGB_IMAGE;
+
+  /* Create the GIMP image and layers */
+  new_image_id = gimp_image_new (width, height, imageType);
+  layer_id = gimp_layer_new (new_image_id, _("Background"),
+                             ROUND4 (width), height,
+                             layerType,
+                             100,
+                             gimp_image_get_default_new_layer_mode (new_image_id));
+  gimp_image_insert_layer (new_image_id, layer_id, -1, 0);
+
+  /* make rectangle */
+  rectangle = g_new (GeglRectangle, 1);
+  rectangle->x = 0;
+  rectangle->y = 0;
+  rectangle->width = ROUND4(width);
+  rectangle->height = height;
+
+  /* get the buffer */
+  buffer = gimp_drawable_get_buffer (layer_id);
+
+  /* fill the buffer */
+  gegl_buffer_set (buffer, rectangle, 0, NULL, (guchar *) capBytes,
+                   GEGL_AUTO_ROWSTRIDE);
+
+  /* flushing data */
+  gegl_buffer_flush (buffer);
+
+  /* Now resize the layer down to the correct size if necessary. */
+  if (width != ROUND4 (width))
+    {
+      gimp_layer_resize (layer_id, width, height, 0, 0);
+      gimp_image_resize (new_image_id, width, height, 0, 0);
+    }
+
+  *image_id = new_image_id;
+
+  return;
+}
+
+/*
+ * doNonRootWindowCapture
+ *
+ * Capture a selected window.
+ * ENTRY POINT FOR WINSNAP NONROOT
+ *
+ */
+static int
+doWindowCapture (void)
+{
+  /* Start up a standard Win32
+   * message handling loop for
+   * selection of the window
+   * to be captured
+   */
+  return winsnapWinMain ();
+}
+
+/******************************************************************
+ * Debug stuff
+ ******************************************************************/
+
+/*
+ * formatWindowsError
+ *
+ * Format the latest Windows error message into
+ * a readable string.  Store in the provided
+ * buffer.
+ */
+static void
+formatWindowsError (char *buffer,
+                    int   buf_size)
+{
+  LPVOID lpMsgBuf;
+
+  /* Format the message */
+  FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
+    FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
+    NULL, GetLastError(),
+    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+    (LPTSTR) &lpMsgBuf, 0, NULL );
+
+  /* Copy to the buffer */
+  strncpy(buffer, lpMsgBuf, buf_size - 1);
+
+  LocalFree(lpMsgBuf);
+}
+
+/******************************************************************
+ * Bitmap capture and handling
+ ******************************************************************/
+
+/*
+ * primDoWindowCapture
+ *
+ * The primitive window capture functionality.  Accepts
+ * the two device contexts and the rectangle to be
+ * captured.
+ */
+static HBITMAP
+primDoWindowCapture (HDC  hdcWindow,
+                     HDC  hdcCompat,
+                     RECT rect)
+{
+  HBITMAP hbmCopy;
+  HGDIOBJ oldObject;
+  BITMAPINFO  bmi;
+
+  int width = (rect.right - rect.left);
+  int height = (rect.bottom - rect.top);
+
+  /* Create the bitmap info header */
+  bmi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
+  bmi.bmiHeader.biWidth = ROUND4(width);
+  bmi.bmiHeader.biHeight = -height;
+  bmi.bmiHeader.biPlanes = 1;
+  bmi.bmiHeader.biBitCount = 24;
+  bmi.bmiHeader.biCompression = BI_RGB;
+  bmi.bmiHeader.biSizeImage = 0;
+  bmi.bmiHeader.biXPelsPerMeter =
+  bmi.bmiHeader.biYPelsPerMeter = 0;
+  bmi.bmiHeader.biClrUsed = 0;
+  bmi.bmiHeader.biClrImportant = 0;
+
+  /* Create the bitmap storage space */
+  hbmCopy = CreateDIBSection (hdcCompat,
+                              (BITMAPINFO *) &bmi,
+                              DIB_RGB_COLORS,
+                              (void **)&capBytes, NULL, 0);
+  if (!hbmCopy)
+    {
+      formatWindowsError(buffer, sizeof buffer);
+      g_error("Error creating DIB section: %s", buffer);
+      return NULL;
+    }
+
+  /* Select the bitmap into the compatible DC. */
+  oldObject = SelectObject (hdcCompat, hbmCopy);
+  if (!oldObject)
+    {
+      formatWindowsError (buffer, sizeof buffer);
+      g_error ("Error selecting object: %s", buffer);
+      return NULL;
+    }
+
+  /* Copy the data from the application to the bitmap.  Even if we did
+   * round up the width, BitBlt only the actual data.
+   */
+  if (!BitBlt(hdcCompat, 0,0,
+              width, height,
+              hdcWindow, rect.left, rect.top,
+              SRCCOPY))
+    {
+      formatWindowsError (buffer, sizeof buffer);
+      g_error ("Error copying bitmap: %s", buffer);
+      return NULL;
+    }
+
+  /* Draw mouse pointer over screenshot if option was selected */
+  if (capturePointer)
+    {
+      CURSORINFO pointer = { sizeof (pointer) };
+      GetCursorInfo (&pointer);
+      DrawIcon (hdcCompat, pointer.ptScreenPos.x, pointer.ptScreenPos.y, GetCursor());
+    }
+
+  /* Restore the original object */
+  SelectObject (hdcCompat, oldObject);
+
+  return hbmCopy;
+}
+
+static BOOL CALLBACK
+GetAccurateWindowRect_MonitorEnumProc (HMONITOR hMonitor,
+                                       HDC      hdcMonitor,
+                                       LPRECT   lprcMonitor,
+                                       LPARAM   dwData)
+{
+  RECT **rectScreens = (RECT**) dwData;
+
+  if (!lprcMonitor) return FALSE;
+
+  if (! (*rectScreens))
+    *rectScreens = (RECT*) g_malloc (sizeof (RECT)*(rectScreensCount+1));
+  else
+    *rectScreens = (RECT*) g_realloc (*rectScreens,
+                                      sizeof (RECT)*(rectScreensCount+1));
+
+  if (*rectScreens == NULL)
+    {
+      rectScreensCount = 0;
+      return FALSE;
+    }
+
+  (*rectScreens)[rectScreensCount] = *lprcMonitor;
+
+  rectScreensCount++;
+
+  return TRUE;
+}
+
+static BOOL
+GetAccurateWindowRect (HWND hwndTarget,
+                       RECT *outRect)
+{
+  HRESULT dwmResult;
+  WINDOWPLACEMENT windowplacment;
+
+  ZeroMemory (outRect, sizeof (RECT));
+
+  /* First we try to get the rect using the dwm api. it will also avoid us from doing more ugly fixes when the window is maximized */
+  if (LoadRequiredDwmFunctions ())
+    {
+      dwmResult = DwmGetWindowAttribute (hwndTarget, DWMWA_EXTENDED_FRAME_BOUNDS, (PVOID) outRect, sizeof (RECT));
+      UnloadRequiredDwmFunctions ();
+      if (dwmResult == S_OK) return TRUE;
+    }
+
+  /* In this case, we did not got the rect from the dwm api so we try to get the rect with the normal function */
+  if (GetWindowRect (hwndTarget, outRect))
+    {
+      /* If the window is maximized then we need and can fix the rect variable
+       * (we need to do this if the rect isn't coming from dwm api)
+       */
+      ZeroMemory (&windowplacment, sizeof (WINDOWPLACEMENT));
+      if (GetWindowPlacement (hwndTarget, &windowplacment) && windowplacment.showCmd == SW_SHOWMAXIMIZED)
+        {
+          RECT *rectScreens = NULL;
+          int   xCenter;
+          int   yCenter;
+          int   i;
+
+          /* If this is not the first time we call this function for some
+           * reason then we reset the rectScreens count
+           */
+          if (rectScreensCount)
+            rectScreensCount = 0;
+
+          /* Get the screens rects */
+          EnumDisplayMonitors (NULL, NULL, GetAccurateWindowRect_MonitorEnumProc,
+                               (LPARAM) &rectScreens);
+
+          /* If for some reason the array size is 0 then we fill it with the desktop rect */
+          if (! rectScreensCount)
+            {
+              rectScreens = (RECT*) g_malloc (sizeof (RECT));
+              if (! GetWindowRect (GetDesktopWindow (), rectScreens))
+                {
+                  /* error: could not get rect screens */
+                  g_free (rectScreens);
+                  return FALSE;
+                }
+
+              rectScreensCount = 1;
+            }
+
+          xCenter = outRect->left + (outRect->right - outRect->left) / 2;
+          yCenter = outRect->top + (outRect->bottom - outRect->top) / 2;
+
+          /* find on which screen the window exist */
+          for (i = 0; i < rectScreensCount; i++)
+            if (xCenter > rectScreens[i].left && xCenter < rectScreens[i].right &&
+                yCenter > rectScreens[i].top && yCenter < rectScreens[i].bottom)
+              break;
+
+          if (i == rectScreensCount)
+            /* Error: did not found on which screen the window exist */
+            return FALSE;
+
+          if (rectScreens[i].left > outRect->left) outRect->left = rectScreens[i].left;
+          if (rectScreens[i].right < outRect->right) outRect->right = rectScreens[i].right;
+          if (rectScreens[i].top > outRect->top) outRect->top = rectScreens[i].top;
+          if (rectScreens[i].bottom < outRect->bottom) outRect->bottom = rectScreens[i].bottom;
+
+          g_free (rectScreens);
+        }
+
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
+gboolean isDwmCompositionEnabled (void)
+{
+  HRESULT err;
+  BOOL    result;
+
+  if (LoadRequiredDwmFunctions ())
+    {
+      err = DwmIsCompositionEnabled (&result);
+      if (err != S_OK)
+        {
+          return FALSE;
+        }
+      return result;
+    }
+
+  return FALSE;
+}
+
+/*
+ * doCapture
+ *
+ * Do the capture.  Accepts the window
+ * handle to be captured or the NULL value
+ * to specify the root window.
+ */
+static gboolean
+doCapture (HWND selectedHwnd)
+{
+  RECT rect;
+
+  /* Try and get everything out of the way before the
+   * capture.
+   */
+  Sleep (500 + winsnapvals.delay * 1000);
+
+  /* Are we capturing a window or the whole screen */
+  if (selectedHwnd)
+    {
+      gboolean compositionEnabled;
+
+      if (! GetAccurateWindowRect (selectedHwnd, &rect))
+      /* For some reason it works only if we return here TRUE. strange... */
+          return TRUE;
+
+      /* First try to capture the window with the magnification api.
+      *  This will solve the bug https://bugzilla.gnome.org/show_bug.cgi?id=793722/
+      */
+      compositionEnabled = isDwmCompositionEnabled ();
+
+      if (! (compositionEnabled && doCaptureMagnificationAPI (selectedHwnd, rect)))
+        {
+          /* If for some reason this capture method failed then
+          *  capture the window with the normal method:
+          */
+          HWND     previousHwnd = GetForegroundWindow ();
+          gboolean success;
+
+          SetForegroundWindow (selectedHwnd);
+          BringWindowToTop (selectedHwnd);
+
+          success = doCaptureBitBlt (selectedHwnd, rect);
+
+          if (previousHwnd)
+            SetForegroundWindow (previousHwnd);
+
+          return success;
+        }
+
+      return TRUE;
+
+    }
+  else
+    {
+      /* Get the screen's rectangle */
+      rect.top    = GetSystemMetrics (SM_YVIRTUALSCREEN);
+      rect.bottom = GetSystemMetrics (SM_YVIRTUALSCREEN) + GetSystemMetrics (SM_CYVIRTUALSCREEN);
+      rect.left   = GetSystemMetrics (SM_XVIRTUALSCREEN);
+      rect.right  = GetSystemMetrics (SM_XVIRTUALSCREEN) + GetSystemMetrics (SM_CXVIRTUALSCREEN);
+
+      return doCaptureBitBlt (selectedHwnd, rect);
+
+    }
+
+  return FALSE; /* we should never get here... */
+}
+
+static gboolean
+doCaptureBitBlt (HWND selectedHwnd,
+                 RECT rect)
+{
+
+  HDC     hdcSrc;
+  HDC     hdcCompat;
+  HBITMAP hbm;
+
+  /* Get the device context for the whole screen
+   * even if we just want to capture a window.
+   * this will allow to capture applications that
+   * don't render to their main window's device
+   * context (e.g. browsers).
+  */
+  hdcSrc = CreateDC (TEXT("DISPLAY"), NULL, NULL, NULL);
+
+  if (!hdcSrc)
+    {
+      formatWindowsError(buffer, sizeof buffer);
+      g_error ("Error getting device context: %s", buffer);
+      return FALSE;
+    }
+  hdcCompat = CreateCompatibleDC (hdcSrc);
+  if (!hdcCompat)
+    {
+      formatWindowsError (buffer, sizeof buffer);
+      g_error ("Error getting compat device context: %s", buffer);
+      return FALSE;
+    }
+
+  /* Do the window capture */
+  hbm = primDoWindowCapture (hdcSrc, hdcCompat, rect);
+  if (!hbm)
+    return FALSE;
+
+  /* Release the device context */
+  ReleaseDC(selectedHwnd, hdcSrc);
+
+  if (hbm == NULL) return FALSE;
+
+  sendBMPToGimp (hbm, hdcCompat, rect);
+
+  return TRUE;
+
+}
+
+static void
+doCaptureMagnificationAPI_callback (HWND            hwnd,
+                                    void           *srcdata,
+                                    MAGIMAGEHEADER  srcheader,
+                                    void           *destdata,
+                                    MAGIMAGEHEADER  destheader,
+                                    RECT            unclipped,
+                                    RECT            clipped,
+                                    HRGN            dirty)
+{
+  if (!srcdata) return;
+  capBytes = (guchar*) malloc (sizeof (guchar)*srcheader.cbSize);
+  rgbaToRgbBytes (capBytes, srcdata, srcheader.cbSize);
+  returnedSrcheader = srcheader;
+}
+
+static BOOL
+isWindowIsAboveCaptureRegion (HWND hwndWindow,
+                              RECT rectCapture)
+{
+  RECT rectWindow;
+  ZeroMemory (&rectWindow, sizeof (RECT));
+  if (!GetWindowRect (hwndWindow, &rectWindow)) return FALSE;
+  if (
+      (
+       (rectWindow.left >= rectCapture.left && rectWindow.left < rectCapture.right)
+       ||
+       (rectWindow.right <= rectCapture.right && rectWindow.right > rectCapture.left)
+       ||
+       (rectWindow.left <= rectCapture.left && rectWindow.right >= rectCapture.right)
+      )
+      &&
+      (
+       (rectWindow.top >= rectCapture.top && rectWindow.top < rectCapture.bottom)
+       ||
+       (rectWindow.bottom <= rectCapture.bottom && rectWindow.bottom > rectCapture.top)
+       ||
+       (rectWindow.top <= rectCapture.top && rectWindow.bottom >= rectCapture.bottom)
+      )
+  )
+    return TRUE;
+  else
+    return FALSE;
+}
+
+static gboolean
+doCaptureMagnificationAPI (HWND selectedHwnd,
+                           RECT rect)
+{
+  HWND            hwndMag;
+  HWND            hwndHost;
+  HWND            nextWindow;
+  HWND            excludeWins[24];
+  RECT            round4Rect;
+  int             excludeWinsCount = 0;
+  int             magStyles;
+
+  if (!LoadMagnificationLibrary ()) return FALSE;
+
+  if (!MagInitialize ()) return FALSE;
+
+  round4Rect = rect;
+  round4Rect.right = round4Rect.left + ROUND4(round4Rect.right - round4Rect.left);
+
+  /* Create the host window that will store the mag child window */
+  hwndHost = CreateWindowEx (0x08000000 | 0x080000 | 0x80 | 0x20, APP_NAME, NULL, 0x80000000,
+                             0, 0, 0, 0, NULL, NULL, GetModuleHandle (NULL), NULL);
+
+  if (!hwndHost)
+    {
+      MagUninitialize ();
+      return FALSE;
+    }
+
+  SetLayeredWindowAttributes (hwndHost, (COLORREF)0, (BYTE)255, (DWORD)0x02);
+
+  magStyles = WS_CHILD;
+  if (capturePointer)
+    magStyles |= MS_SHOWMAGNIFIEDCURSOR;
+
+  /* Create the mag child window inside the host window */
+  hwndMag = CreateWindow (WC_MAGNIFIER, TEXT ("MagnifierWindow"),
+                          magStyles,
+                          0, 0, round4Rect.right - round4Rect.left, round4Rect.bottom - round4Rect.top,
+                          hwndHost, NULL, GetModuleHandle (NULL), NULL);
+
+  /* Set the callback function that will be called by the api to get the pixels */
+  if (!MagSetImageScalingCallback (hwndMag, (MagImageScalingCallback)doCaptureMagnificationAPI_callback))
+    {
+      DestroyWindow (hwndHost);
+      MagUninitialize ();
+      return FALSE;
+    }
+
+  /* Add only windows that above the target window */
+  for (nextWindow = GetNextWindow (selectedHwnd, GW_HWNDPREV); nextWindow != NULL; nextWindow = GetNextWindow (nextWindow, GW_HWNDPREV))
+    if (isWindowIsAboveCaptureRegion (nextWindow, rect))
+    {
+      excludeWins[excludeWinsCount++] = nextWindow;
+      /* This api can't work with more than 24 windows. we stop on the 24 window */
+      if (excludeWinsCount >= 24) break;
+    }
+
+  if (excludeWinsCount)
+    MagSetWindowFilterList (hwndMag, MW_FILTERMODE_EXCLUDE, excludeWinsCount, excludeWins);
+
+  /* Call the api to capture the window */
+  capBytes = NULL;
+
+  if (!MagSetWindowSource (hwndMag, round4Rect) || !capBytes)
+    {
+      DestroyWindow (hwndHost);
+      MagUninitialize ();
+      return FALSE;
+    }
+
+  /* Send it to Gimp */
+  sendBMPToGimp (NULL, NULL, rect);
+
+  DestroyWindow (hwndHost);
+  MagUninitialize ();
+
+  return TRUE;
+}
+
+/******************************************************************
+ * Win32 entry point and setup...
+ ******************************************************************/
+
+#define DINV 3
+
+/*
+ * highlightWindowFrame
+ *
+ * Highlight (or unhighlight) the specified
+ * window handle's frame.
+ */
+static void
+highlightWindowFrame (HWND hWnd)
+{
+  HDC  hdc;
+  RECT rc;
+
+  if (!IsWindow (hWnd))
+    return;
+
+  hdc = GetWindowDC (hWnd);
+  GetWindowRect (hWnd, &rc);
+  OffsetRect (&rc, -rc.left, -rc.top);
+
+  if (!IsRectEmpty (&rc))
+    {
+      PatBlt (hdc, rc.left, rc.top, rc.right-rc.left, DINV, DSTINVERT);
+      PatBlt (hdc, rc.left, rc.bottom-DINV, DINV, -(rc.bottom-rc.top-2*DINV),
+              DSTINVERT);
+      PatBlt (hdc, rc.right-DINV, rc.top+DINV, DINV, rc.bottom-rc.top-2*DINV,
+              DSTINVERT);
+      PatBlt (hdc, rc.right, rc.bottom-DINV, -(rc.right-rc.left), DINV,
+              DSTINVERT);
+    }
+
+  ReleaseDC (hWnd, hdc);
+  UpdateWindow (hWnd);
+}
+
+/*
+ * setCaptureType
+ *
+ * Set the capture type.  Should be one of:
+ * SELECT_FRAME
+ * SELECT_CLIENT
+ * SELECT_WINDOW
+ */
+void
+setCaptureType (int capType)
+{
+  captureType = capType;
+}
+
+/*
+ * myWindowFromPoint
+ *
+ * Map to the appropriate window from the
+ * specified point.  The chosen window is
+ * based on the current capture type.
+ */
+static HWND
+myWindowFromPoint (POINT pt)
+{
+  HWND myHwnd;
+  HWND nextHwnd;
+
+  switch (captureType)
+    {
+    case SELECT_FRAME:
+    case SELECT_CLIENT:
+      nextHwnd = WindowFromPoint (pt);
+
+      do {
+          myHwnd = nextHwnd;
+          nextHwnd = GetParent (myHwnd);
+      } while (nextHwnd);
+
+      return myHwnd;
+      break;
+
+    case SELECT_WINDOW:
+      return WindowFromPoint (pt);
+      break;
+    }
+
+  return WindowFromPoint (pt);
+}
+
+/*
+ * dialogProc
+ *
+ * The window procedure for the window
+ * selection dialog box.
+ */
+BOOL CALLBACK
+dialogProc (HWND   hwndDlg,
+            UINT   msg,
+            WPARAM wParam,
+            LPARAM lParam)
+{
+  static int     mouseCaptured;
+  static int     buttonDown;
+  static HCURSOR oldCursor;
+  static RECT    bitmapRect;
+  static HWND    highlightedHwnd = NULL;
+
+  switch (msg)
+    {
+    case WM_INITDIALOG:
+        {
+          int    nonclientHeight;
+          HWND   hwndGroup;
+          RECT   dlgRect;
+          RECT   clientRect;
+          RECT   groupRect;
+          BITMAP bm;
+
+          /* Set the mouse capture flag */
+          buttonDown = 0;
+          mouseCaptured = 0;
+
+          /* Calculate the bitmap dimensions */
+          GetObject (iconInfo.hbmMask, sizeof(BITMAP), (VOID *)&bm);
+
+          /* Calculate the dialog window dimensions */
+          GetWindowRect (hwndDlg, &dlgRect);
+
+          /* Calculate the group box dimensions */
+          hwndGroup = GetDlgItem(hwndDlg, IDC_GROUP);
+          GetWindowRect (hwndGroup, &groupRect);
+          OffsetRect (&groupRect, -dlgRect.left, -dlgRect.top);
+
+          /* The client's rectangle */
+          GetClientRect (hwndDlg, &clientRect);
+
+          /* The non-client height */
+          nonclientHeight = (dlgRect.bottom - dlgRect.top) -
+            (clientRect.bottom - clientRect.top);
+
+          /* Calculate the bitmap rectangle */
+          bitmapRect.top = ((groupRect.top + groupRect.bottom) / 2) -
+            (bm.bmHeight / 2);
+          bitmapRect.top -= nonclientHeight;
+          bitmapRect.bottom = bitmapRect.top + bm.bmHeight;
+          bitmapRect.left = ((groupRect.left + groupRect.right) / 2) - (bm.bmWidth / 2);
+          bitmapRect.right = bitmapRect.left + bm.bmWidth;
+        }
+      break;
+
+    case WM_LBUTTONDOWN:
+      /* Track the button down state */
+      buttonDown = 1;
+      break;
+
+    case WM_LBUTTONUP:
+      buttonDown = 0;
+
+      /* If we have mouse captured
+       * we do this stuff.
+       */
+      if (mouseCaptured)
+        {
+          HWND  selectedHwnd;
+          POINT cursorPos;
+
+          /* Release the capture */
+          mouseCaptured = 0;
+          SetCursor (oldCursor);
+          ReleaseCapture ();
+
+          /* Remove the highlight */
+          if (highlightedHwnd)
+            highlightWindowFrame (highlightedHwnd);
+          RedrawWindow (hwndDlg, NULL, NULL, RDW_INVALIDATE);
+
+          /* Return the selected window */
+          GetCursorPos (&cursorPos);
+          selectedHwnd = myWindowFromPoint (cursorPos);
+          EndDialog (hwndDlg, (INT_PTR) selectedHwnd);
+        }
+      break;
+
+    case WM_MOUSEMOVE:
+      /* If the mouse is captured, show
+       * the window which is tracking
+       * under the mouse position.
+       */
+      if (mouseCaptured)
+        {
+          HWND  currentHwnd;
+          POINT cursorPos;
+
+          /* Get the window */
+          GetCursorPos (&cursorPos);
+          currentHwnd = myWindowFromPoint (cursorPos);
+
+          /* Do the highlighting */
+          if (highlightedHwnd != currentHwnd)
+            {
+              if (highlightedHwnd)
+                highlightWindowFrame (highlightedHwnd);
+              if (currentHwnd)
+                highlightWindowFrame (currentHwnd);
+              highlightedHwnd = currentHwnd;
+            }
+          /* If the mouse has not been captured,
+           * try to figure out if we should capture
+           * the mouse.
+           */
+      }
+      else if (buttonDown)
+        {
+          POINT cursorPos;
+
+          /* Get the current client position */
+          GetCursorPos (&cursorPos);
+          ScreenToClient (hwndDlg, &cursorPos);
+
+          /* Check if within the rectangle formed
+           * by the bitmap
+           */
+          if (PtInRect (&bitmapRect, cursorPos)) {
+              mouseCaptured = 1;
+              oldCursor = SetCursor (selectCursor);
+              SetCapture (hwndDlg);
+              RedrawWindow (hwndDlg, NULL, NULL, RDW_INVALIDATE | RDW_ERASE);
+          }
+        }
+
+      break;
+
+    case WM_PAINT:
+        {
+          HDC          hDC;
+          PAINTSTRUCT  ps;
+
+          /* If the mouse is not captured draw
+           * the cursor image
+           */
+          if (!mouseCaptured)
+            {
+              hDC = BeginPaint (hwndDlg, &ps);
+              DrawIconEx (hDC, bitmapRect.left, bitmapRect.top, selectCursor,
+                          0, 0, 0, NULL, DI_NORMAL);
+              EndPaint (hwndDlg, &ps);
+            }
+        }
+      break;
+
+    case WM_COMMAND:
+      /* Handle the cancel button */
+      switch (LOWORD (wParam))
+        {
+        case IDCANCEL:
+          EndDialog (hwndDlg, 0);
+          return TRUE;
+          break;
+        }
+
+    }
+
+  return FALSE;
+}
+
+///* Don't use the normal WinMain from gimp.h */
+//#define WinMain WinMain_no_thanks
+//MAIN()
+//#undef WinMain
+
+/*
+ * WinMain
+ *
+ * The standard gimp plug-in WinMain won't quite cut it for
+ * this plug-in.
+ */
+//int APIENTRY
+//WinMain(HINSTANCE hInstance,
+//  HINSTANCE hPrevInstance,
+//  LPSTR     lpCmdLine,
+//  int       nCmdShow)
+//{
+//  /*
+//   * Normally, we would do all of the Windows-ish set up of
+//   * the window classes and stuff here in WinMain.  But,
+//   * the only time we really need the window and message
+//   * queues is during the plug-in run.  So, all of that will
+//   * be done during run().  This avoids all of the Windows
+//   * setup stuff for the query().  Stash the instance handle now
+//   * so it is available from the run() procedure.
+//   */
+//  hInst = hInstance;
+//
+//  /*
+//   * Now, call gimp_main... This is what the normal WinMain()
+//   * would do.
+//   */
+////  return gimp_main(&PLUG_IN_INFO, __argc, __argv);
+//}
+
+/*
+ * InitApplication
+ *
+ * Initialize window data and register the window class
+ */
+BOOL
+InitApplication (HINSTANCE hInstance)
+{
+  WNDCLASS wc;
+  BOOL     retValue;
+
+  /* Get some resources */
+#ifdef _MSC_VER
+  /* For some reason this works only with MSVC */
+  selectCursor = LoadCursor (hInstance, MAKEINTRESOURCE(IDC_SELECT));
+#else
+  selectCursor = LoadCursor (NULL, IDC_CROSS);
+#endif
+  GetIconInfo (selectCursor, &iconInfo);
+
+  /*
+   * Fill in window class structure with parameters to describe
+   * the main window.
+   */
+  wc.style = CS_HREDRAW | CS_VREDRAW;
+  wc.lpfnWndProc = (WNDPROC) WndProc;
+  wc.cbClsExtra = 0;
+  wc.cbWndExtra = 0;
+  wc.hInstance = hInstance;
+  wc.hIcon = LoadIcon (NULL, IDI_APPLICATION);
+  wc.hCursor = LoadCursor (NULL, IDC_ARROW);
+  wc.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1);
+  wc.lpszClassName = APP_NAME;
+  wc.lpszMenuName = NULL;
+
+  /* Register the window class and stash success/failure code. */
+  retValue = RegisterClass (&wc);
+
+  /* Log error */
+  if (!retValue)
+    {
+      formatWindowsError (buffer, sizeof buffer);
+      g_error ("Error registering class: %s", buffer);
+      return retValue;
+    }
+
+  return retValue;
+}
+
+/*
+ * InitInstance
+ *
+ * Create the main window for the application.
+ */
+BOOL
+InitInstance (HINSTANCE hInstance,
+              int       nCmdShow)
+{
+  HINSTANCE User32Library = LoadLibrary ("user32.dll");
+
+  if (User32Library)
+    {
+      typedef BOOL (WINAPI* SET_PROC_DPI_AWARE)();
+      SET_PROC_DPI_AWARE SetProcessDPIAware;
+
+      /* This line fix bug: https://bugzilla.gnome.org/show_bug.cgi?id=796121#c4 */
+      SetProcessDPIAware = (SET_PROC_DPI_AWARE) GetProcAddress (User32Library,
+                                                                "SetProcessDPIAware");
+      if (SetProcessDPIAware)
+        SetProcessDPIAware();
+
+      FreeLibrary (User32Library);
+    }
+
+  /* Create our window */
+  mainHwnd = CreateWindow (APP_NAME, APP_NAME, WS_OVERLAPPEDWINDOW,
+                           CW_USEDEFAULT, 0, CW_USEDEFAULT, 0,
+                           NULL, NULL, hInstance, NULL);
+
+  if (!mainHwnd)
+    {
+      return (FALSE);
+    }
+
+  ShowWindow (mainHwnd, nCmdShow);
+  UpdateWindow (mainHwnd);
+
+  return TRUE;
+}
+
+/*
+ * winsnapWinMain
+ *
+ * This is the function that represents the code that
+ * would normally reside in WinMain (see above).  This
+ * function will get called during run() in order to set
+ * up the windowing environment necessary for WinSnap to
+ * operate.
+ */
+int
+winsnapWinMain (void)
+{
+  MSG msg;
+
+  /* Perform instance initialization */
+  if (!InitApplication (hInst))
+    return (FALSE);
+
+  /* Perform application initialization */
+  if (!InitInstance (hInst, SHOW_WINDOW))
+    return (FALSE);
+
+  /* Main message loop */
+  while (GetMessage (&msg, NULL, 0, 0))
+    {
+      TranslateMessage (&msg);
+      DispatchMessage (&msg);
+    }
+
+  return (msg.wParam);
+}
+
+/*
+ * WndProc
+ *
+ * Process window message for the main window.
+ */
+LRESULT CALLBACK
+WndProc (HWND   hwnd,
+         UINT   message,
+         WPARAM wParam,
+         LPARAM lParam)
+{
+  HWND selectedHwnd;
+
+  switch (message)
+    {
+
+    case WM_CREATE:
+      /* The window is created... Send the capture message */
+      PostMessage (hwnd, WM_DOCAPTURE, 0, 0);
+      break;
+
+    case WM_DOCAPTURE:
+      /* Get the selected window handle */
+      selectedHwnd = (HWND) DialogBox (hInst, MAKEINTRESOURCE(IDD_SELECT),
+                                       hwnd, (DLGPROC) dialogProc);
+      if (selectedHwnd)
+        doCapture (selectedHwnd);
+
+      PostQuitMessage (selectedHwnd != NULL);
+
+      break;
+
+    case WM_DESTROY:
+      PostQuitMessage (0);
+      break;
+
+    default:
+      return (DefWindowProc (hwnd, message, wParam, lParam));
+    }
+
+  return 0;
+}
+
+#endif /* G_OS_WIN32 */