From 5470a67335dfd9afffb92ff6521a77519cda40d8 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jos=C3=A9=20Fonseca?= <jfonseca@vmware.com>
Date: Mon, 6 Jul 2009 17:08:37 +0100
Subject: [PATCH] wgl: Listen to WM_WINDOWPOSCHANGED instead of WM_SIZE
 messages.

According to
http://blogs.msdn.com/oldnewthing/archive/2008/01/15/7113860.aspx
WM_SIZE is generated from WM_WINDOWPOSCHANGED by DefWindowProc so it
can be masked out by the application.

Also there were some weird bogus WM_SIZE 0x0 messages when starting
sharedtex_mt which we don't get like this.
---
 .../wgl/shared/stw_framebuffer.c              | 89 ++++++++++---------
 1 file changed, 45 insertions(+), 44 deletions(-)

diff --git a/src/gallium/state_trackers/wgl/shared/stw_framebuffer.c b/src/gallium/state_trackers/wgl/shared/stw_framebuffer.c
index 78a2dbc4d7c..c0a42c1b7d4 100644
--- a/src/gallium/state_trackers/wgl/shared/stw_framebuffer.c
+++ b/src/gallium/state_trackers/wgl/shared/stw_framebuffer.c
@@ -80,6 +80,31 @@ stw_framebuffer_destroy_locked(
 }
 
 
+static INLINE void
+stw_framebuffer_get_size( struct stw_framebuffer *fb )
+{
+   unsigned width, height;
+   RECT rect;
+
+   assert(fb->hWnd);
+   
+   GetClientRect( fb->hWnd, &rect );
+   width = rect.right - rect.left;
+   height = rect.bottom - rect.top;
+
+   if(width < 1)
+      width = 1;
+   if(height < 1)
+      height = 1;
+
+   if(width != fb->width || height != fb->height) {
+      fb->must_resize = TRUE;
+      fb->width = width; 
+      fb->height = height; 
+   }
+}
+
+
 /**
  * @sa http://msdn.microsoft.com/en-us/library/ms644975(VS.85).aspx
  * @sa http://msdn.microsoft.com/en-us/library/ms644960(VS.85).aspx
@@ -92,6 +117,7 @@ stw_call_window_proc(
 {
    struct stw_tls_data *tls_data;
    PCWPSTRUCT pParams = (PCWPSTRUCT)lParam;
+   struct stw_framebuffer *fb;
    
    tls_data = stw_tls_get_data();
    if(!tls_data)
@@ -100,28 +126,28 @@ stw_call_window_proc(
    if (nCode < 0)
        return CallNextHookEx(tls_data->hCallWndProcHook, nCode, wParam, lParam);
 
-   if (pParams->message == WM_SIZE && pParams->wParam != SIZE_MINIMIZED) {
-      struct stw_framebuffer *fb;
-
-      pipe_mutex_lock( stw_dev->mutex );
-      fb = stw_framebuffer_from_hwnd_locked( pParams->hwnd );
-      pipe_mutex_unlock( stw_dev->mutex );
-      
-      if(fb) {
-         unsigned width = LOWORD( pParams->lParam );
-         unsigned height = HIWORD( pParams->lParam );
+   if (pParams->message == WM_WINDOWPOSCHANGED) {
+      /* We handle WM_WINDOWPOSCHANGED instead of WM_SIZE because according to
+       * http://blogs.msdn.com/oldnewthing/archive/2008/01/15/7113860.aspx 
+       * WM_SIZE is generated from WM_WINDOWPOSCHANGED by DefWindowProc so it 
+       * can be masked out by the application. */
+      LPWINDOWPOS lpWindowPos = (LPWINDOWPOS)pParams->lParam;
+      if((lpWindowPos->flags & SWP_SHOWWINDOW) || 
+         !(lpWindowPos->flags & SWP_NOSIZE)) {
+         pipe_mutex_lock( stw_dev->mutex );
+         fb = stw_framebuffer_from_hwnd_locked( pParams->hwnd );
+         pipe_mutex_unlock( stw_dev->mutex );
          
-         pipe_mutex_lock( fb->mutex );
-         fb->must_resize = TRUE;
-         fb->width = width;
-         fb->height = height;
-         pipe_mutex_unlock( fb->mutex );
+         if(fb) {
+            pipe_mutex_lock( fb->mutex );
+            /* Size in WINDOWPOS includes the window frame, so get the size 
+             * of the client area via GetClientRect.  */
+            stw_framebuffer_get_size(fb);
+            pipe_mutex_unlock( fb->mutex );
+         }
       }
    }
-
-   if (pParams->message == WM_DESTROY) {
-      struct stw_framebuffer *fb;
-
+   else if (pParams->message == WM_DESTROY) {
       pipe_mutex_lock( stw_dev->mutex );
       
       fb = stw_framebuffer_from_hwnd_locked( pParams->hwnd );
@@ -135,31 +161,6 @@ stw_call_window_proc(
 }
 
 
-static void
-stw_framebuffer_get_size( struct stw_framebuffer *fb )
-{
-   unsigned width, height;
-   RECT rect;
-
-   assert(fb->hWnd);
-   
-   GetClientRect( fb->hWnd, &rect );
-   width = rect.right - rect.left;
-   height = rect.bottom - rect.top;
-
-   if(width < 1)
-      width = 1;
-   if(height < 1)
-      height = 1;
-
-   if(width != fb->width || height != fb->height) {
-      fb->must_resize = TRUE;
-      fb->width = width; 
-      fb->height = height; 
-   }
-}
-
-
 /**
  * Create a new framebuffer object which will correspond to the given HDC.
  */
-- 
2.30.2