From 88e417d7614aa1dbb46187fb0609a3a2c2291905 Mon Sep 17 00:00:00 2001
From: José Fonseca <jfonseca@vmware.com>
Date: Mon, 8 Oct 2012 11:40:58 +0100
Subject: st/wgl: Don't cache HDC anywhere.

Applications may destroy HDC at any time. So always get a HDC as needed.

Fixes lack of presents with Solidworks eDrawings when screen resolution is
changed.

Reviewed-by: Brian Paul <brianp@vmware.com>
---
 src/gallium/state_trackers/wgl/stw_ext_pbuffer.c |  2 --
 src/gallium/state_trackers/wgl/stw_framebuffer.c |  7 -------
 src/gallium/state_trackers/wgl/stw_framebuffer.h |  1 -
 src/gallium/state_trackers/wgl/stw_st.c          | 13 ++++++++++++-
 4 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/src/gallium/state_trackers/wgl/stw_ext_pbuffer.c b/src/gallium/state_trackers/wgl/stw_ext_pbuffer.c
index 7596cb6bd95..0bd60c064d7 100644
--- a/src/gallium/state_trackers/wgl/stw_ext_pbuffer.c
+++ b/src/gallium/state_trackers/wgl/stw_ext_pbuffer.c
@@ -248,8 +248,6 @@ wglGetPbufferDCARB(HPBUFFERARB hPbuffer)
 
    hDC = GetDC(fb->hWnd);
 
-   assert(hDC == fb->hDC);
-
    return hDC;
 }
 
diff --git a/src/gallium/state_trackers/wgl/stw_framebuffer.c b/src/gallium/state_trackers/wgl/stw_framebuffer.c
index d0d5e9e0fe6..449c5373b06 100644
--- a/src/gallium/state_trackers/wgl/stw_framebuffer.c
+++ b/src/gallium/state_trackers/wgl/stw_framebuffer.c
@@ -92,8 +92,6 @@ stw_framebuffer_destroy_locked(
 
    stw_st_destroy_framebuffer_locked(fb->stfb);
    
-   ReleaseDC(fb->hWnd, fb->hDC);
-
    pipe_mutex_unlock( fb->mutex );
 
    pipe_mutex_destroy( fb->mutex );
@@ -254,11 +252,6 @@ stw_framebuffer_create(
    if (fb == NULL)
       return NULL;
 
-   /* Applications use, create, destroy device contexts, so the hdc passed is.  We create our own DC
-    * because we need one for single buffered visuals.
-    */
-   fb->hDC = GetDC(hWnd);
-
    fb->hWnd = hWnd;
    fb->iPixelFormat = iPixelFormat;
 
diff --git a/src/gallium/state_trackers/wgl/stw_framebuffer.h b/src/gallium/state_trackers/wgl/stw_framebuffer.h
index bf20d6a3d29..3ba51ba6898 100644
--- a/src/gallium/state_trackers/wgl/stw_framebuffer.h
+++ b/src/gallium/state_trackers/wgl/stw_framebuffer.h
@@ -58,7 +58,6 @@ struct stw_framebuffer
     * above, to prevent the framebuffer from being destroyed.
     */
    
-   HDC hDC;
    HWND hWnd;
 
    int iPixelFormat;
diff --git a/src/gallium/state_trackers/wgl/stw_st.c b/src/gallium/state_trackers/wgl/stw_st.c
index 28c93f4fb57..7151508b73e 100644
--- a/src/gallium/state_trackers/wgl/stw_st.c
+++ b/src/gallium/state_trackers/wgl/stw_st.c
@@ -175,10 +175,21 @@ stw_st_framebuffer_flush_front(struct st_framebuffer_iface *stfb,
                                enum st_attachment_type statt)
 {
    struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
+   boolean ret;
+   HDC hDC;
 
    pipe_mutex_lock(stwfb->fb->mutex);
 
-   return stw_st_framebuffer_present_locked(stwfb->fb->hDC, &stwfb->base, statt);
+   /* We must not cache HDCs anywhere, as they can be invalidated by the
+    * application, or screen resolution changes. */
+
+   hDC = GetDC(stwfb->fb->hWnd);
+
+   ret = stw_st_framebuffer_present_locked(hDC, &stwfb->base, statt);
+
+   ReleaseDC(stwfb->fb->hWnd, hDC);
+
+   return ret;
 }
 
 /**
-- 
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