From bbc511e80b2a9365f6a1528bc1595772f83be654 Mon Sep 17 00:00:00 2001
From: Jon TURNEY <jon.turney@dronecode.org.uk>
Date: Mon, 15 Feb 2010 13:42:04 +0000
Subject: [PATCH] Cygwin/X: Make WM_SIZE use RandR resizing when -resize=randr

To avoid recursion, WM_SIZE requests shouldn't generate XRANDR requests
when no change is neeeded.

We do the actual resize on WM_EXITSIZEMOVE, as resizing occurs in
a modal loop, to avoid a backlog of resize events building up as
the X server doesn't get a change to process anything until the resize
is completed.

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Colin Harrison <colin.harrison@virgin.net>
Tested-by: Colin Harrison <colin.harrison@virgin.net>
---
 hw/xwin/winwndproc.c | 48 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 43 insertions(+), 5 deletions(-)

diff --git a/hw/xwin/winwndproc.c b/hw/xwin/winwndproc.c
index 27fc840b5..04a3a6b86 100644
--- a/hw/xwin/winwndproc.c
+++ b/hw/xwin/winwndproc.c
@@ -303,7 +303,7 @@ winWindowProc (HWND hwnd, UINT message,
 	winDebug ("winWindowProc - WM_SIZE\n");
 #endif
 
-	/* Break if we do not use scrollbars */
+	/* Break if we do not allow resizing */
 	if ((s_pScreenInfo->iResizeMode == notAllowed)
 	    || !s_pScreenInfo->fDecoration
 #ifdef XWIN_MULTIWINDOWEXTWM
@@ -320,6 +320,17 @@ winWindowProc (HWND hwnd, UINT message,
 	if (wParam == SIZE_MINIMIZED)
 	  return 0;
 
+        ErrorF ("winWindowProc - WM_SIZE - new client area w: %d h: %d\n",
+                LOWORD (lParam), HIWORD (lParam));
+
+        if (s_pScreenInfo->iResizeMode == resizeWithRandr)
+          {
+            /* Actual resizing is done on WM_EXITSIZEMOVE */
+            return 0;
+          }
+
+        /* Otherwise iResizeMode == resizeWithScrollbars */
+
 	/*
 	 * Get the size of the whole window, including client area,
 	 * scrollbars, and non-client area decorations (caption, borders).
@@ -337,10 +348,6 @@ winWindowProc (HWND hwnd, UINT message,
 	iWidth = rcWindow.right - rcWindow.left;
 	iHeight = rcWindow.bottom - rcWindow.top;
 
-	ErrorF ("winWindowProc - WM_SIZE - window w: %d h: %d, "
-		"new client area w: %d h: %d\n",
-		iWidth, iHeight, LOWORD (lParam), HIWORD (lParam));
-
 	/* Subtract the frame size from the window size. */
 	iWidth -= 2 * GetSystemMetrics (SM_CXSIZEFRAME);
 	iHeight -= (2 * GetSystemMetrics (SM_CYSIZEFRAME)
@@ -396,6 +403,37 @@ winWindowProc (HWND hwnd, UINT message,
       }
       return 0;
 
+    case WM_ENTERSIZEMOVE:
+      ErrorF("winWindowProc - WM_ENTERSIZEMOVE\n");
+      break;
+
+    case WM_EXITSIZEMOVE:
+      ErrorF("winWindowProc - WM_EXITSIZEMOVE\n");
+
+      if (s_pScreenInfo->iResizeMode == resizeWithRandr)
+        {
+          /* Set screen size to match new client area, if it is different to current */
+          RECT rcClient;
+          DWORD dwWidth, dwHeight;
+
+          GetClientRect (hwnd, &rcClient);
+          dwWidth = rcClient.right - rcClient.left;
+          dwHeight = rcClient.bottom - rcClient.top;
+
+          if ((s_pScreenInfo->dwWidth != dwWidth) ||
+              (s_pScreenInfo->dwHeight != dwHeight))
+            {
+              /* mm = dots * (25.4 mm / inch) / (dots / inch) */
+              winDoRandRScreenSetSize(s_pScreen,
+                                      dwWidth,
+                                      dwHeight,
+                                      (dwWidth * 25.4) / monitorResolution,
+                                      (dwHeight * 25.4) / monitorResolution);
+            }
+        }
+
+      break;
+
     case WM_VSCROLL:
       {
 	SCROLLINFO		si;