[jimtabor] 54508: [Win32k] - Create Monitor from rect. This will be used for window placement support.

Author: jimtabor
Date: Sun Nov 27 12:47:43 2011
New Revision: 54508

URL: http://svn.reactos.org/svn/reactos?rev=54508&view=rev
Log:
[Win32k]
- Create Monitor from rect. This will be used for window placement support.

Modified:
    trunk/reactos/subsystems/win32/win32k/include/monitor.h
    trunk/reactos/subsystems/win32/win32k/ntuser/monitor.c

Modified: trunk/reactos/subsystems/win32/win32k/include/monitor.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/win32/win32k/in…
==============================================================================
--- trunk/reactos/subsystems/win32/win32k/include/monitor.h [iso-8859-1] (original)
+++ trunk/reactos/subsystems/win32/win32k/include/monitor.h [iso-8859-1] Sun Nov 27
12:47:43 2011
@@ -33,5 +33,6 @@
 NTSTATUS IntUpdateMonitorSize(IN PDEVOBJ *pGdiDevice);
 PMONITOR FASTCALL UserGetMonitorObject(IN HMONITOR);
 PMONITOR FASTCALL IntGetPrimaryMonitor(VOID);
+PMONITOR FASTCALL IntMonitorFromRect(PRECTL,DWORD);
 
 /* EOF */

Modified: trunk/reactos/subsystems/win32/win32k/ntuser/monitor.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/win32/win32k/nt…
==============================================================================
--- trunk/reactos/subsystems/win32/win32k/ntuser/monitor.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/win32/win32k/ntuser/monitor.c [iso-8859-1] Sun Nov 27
12:47:43 2011
@@ -402,6 +402,83 @@
 
     return cMonitors;
 }
+
+PMONITOR
+FASTCALL
+IntMonitorFromRect(
+    PRECTL pRect,
+    DWORD dwFlags)
+{
+    ULONG cMonitors, LargestArea = 0, i;
+    PRECTL prcMonitorList = NULL;
+    HMONITOR *phMonitorList = NULL;
+    HMONITOR hMonitor = NULL;
+
+    /* Check if flags are valid */
+    if (dwFlags != MONITOR_DEFAULTTONULL &&
+        dwFlags != MONITOR_DEFAULTTOPRIMARY &&
+        dwFlags != MONITOR_DEFAULTTONEAREST)
+    {
+        EngSetLastError(ERROR_INVALID_FLAGS);
+        return NULL;
+    }
+
+    /* Find intersecting monitors */
+    cMonitors = IntGetMonitorsFromRect(pRect, &hMonitor, NULL, 1, dwFlags);
+    if (cMonitors <= 1)
+    {
+        /* No or one monitor found. Just return handle. */
+        goto cleanup;
+    }
+
+    /* There is more than one monitor. Find monitor with largest intersection.
+       Temporary reset hMonitor */
+    hMonitor = NULL;
+
+    /* Allocate helper buffers */
+    phMonitorList = ExAllocatePoolWithTag(PagedPool,
+                                          sizeof(HMONITOR) * cMonitors,
+                                          USERTAG_MONITORRECTS);
+    if (phMonitorList == NULL)
+    {
+        EngSetLastError(ERROR_NOT_ENOUGH_MEMORY);
+        goto cleanup;
+    }
+
+    prcMonitorList = ExAllocatePoolWithTag(PagedPool,
+                                           sizeof(RECT) * cMonitors,
+                                           USERTAG_MONITORRECTS);
+    if (prcMonitorList == NULL)
+    {
+        EngSetLastError(ERROR_NOT_ENOUGH_MEMORY);
+        goto cleanup;
+    }
+
+    /* Get intersecting monitors again but now with rectangle list */
+    cMonitors = IntGetMonitorsFromRect(pRect, phMonitorList, prcMonitorList,
+                                       cMonitors, 0);
+
+    /* Find largest intersection */
+    for (i = 0; i < cMonitors; i++)
+    {
+        ULONG Area = (prcMonitorList[i].right - prcMonitorList[i].left) *
+                     (prcMonitorList[i].bottom - prcMonitorList[i].top);
+        if (Area >= LargestArea)
+        {
+            hMonitor = phMonitorList[i];
+            LargestArea = Area;
+        }
+    }
+
+cleanup:
+    if (phMonitorList)
+        ExFreePoolWithTag(phMonitorList, USERTAG_MONITORRECTS);
+    if (prcMonitorList)
+        ExFreePoolWithTag(prcMonitorList, USERTAG_MONITORRECTS);
+
+    return UserGetMonitorObject(hMonitor);
+}
+
 
 /* PUBLIC FUNCTIONS ***********************************************************/