Commit: 19fba61d46a6e54d0a85a88f36bd150ec3df97b4
Author: Christopher Peerman
Date:   Mon Jan 14 12:15:59 2019 +0100
Branches: blender2.7
https://developer.blender.org/rB19fba61d46a6e54d0a85a88f36bd150ec3df97b4

Fix T55589: drawing strokes with Microsoft surface pen misses first part.

This disables touch gesture recognition in Blender, avoiding any initial delay
when drawing with grease pencil, texture paint, etc.

Differential Revision: https://developer.blender.org/D4203

===================================================================

M       intern/ghost/intern/GHOST_WindowWin32.cpp
M       intern/ghost/intern/GHOST_WindowWin32.h

===================================================================

diff --git a/intern/ghost/intern/GHOST_WindowWin32.cpp 
b/intern/ghost/intern/GHOST_WindowWin32.cpp
index 983fffc10e6..17dbc858e01 100644
--- a/intern/ghost/intern/GHOST_WindowWin32.cpp
+++ b/intern/ghost/intern/GHOST_WindowWin32.cpp
@@ -190,7 +190,24 @@ GHOST_WindowWin32::GHOST_WindowWin32(GHOST_SystemWin32 
*system,
                    0);                         // pointer to window-creation 
data
                free(title_16);
        }
+
+       m_user32 = ::LoadLibrary("user32.dll");
+
        if (m_hWnd) {
+               if (m_user32) {
+                       // Touch enabled screens with pen support by default 
have gestures
+                       // enabled, which results in a delay between the 
pointer down event
+                       // and the first move when using the stylus. 
RegisterTouchWindow
+                       // disables the new gesture architecture enabling the 
events to be
+                       // sent immediately to the application rather than 
being absorbed by
+                       // the gesture API.
+                       GHOST_WIN32_RegisterTouchWindow pRegisterTouchWindow =
+                               
(GHOST_WIN32_RegisterTouchWindow)GetProcAddress(m_user32, 
"RegisterTouchWindow");
+                       if (pRegisterTouchWindow) {
+                               pRegisterTouchWindow(m_hWnd, 0);
+                       }
+               }
+
                // Register this window as a droptarget. Requires m_hWnd to be 
valid.
                // Note that OleInitialize(0) has to be called prior to this. 
Done in GHOST_SystemWin32.
                m_dropTarget = new GHOST_DropTargetWin32(this, m_system);
@@ -368,6 +385,11 @@ GHOST_WindowWin32::~GHOST_WindowWin32()
                ::DestroyWindow(m_hWnd);
                m_hWnd = 0;
        }
+
+       if (m_user32) {
+               FreeLibrary(m_user32);
+               m_user32 = NULL;
+       }
 }
 
 bool GHOST_WindowWin32::getValid() const
@@ -998,10 +1020,6 @@ void GHOST_WindowWin32::bringTabletContextToFront()
 
 GHOST_TUns16 GHOST_WindowWin32::getDPIHint()
 {
-       if (!m_user32) {
-               m_user32 = ::LoadLibrary("user32.dll");
-       }
-
        if (m_user32) {
                GHOST_WIN32_GetDpiForWindow fpGetDpiForWindow = 
(GHOST_WIN32_GetDpiForWindow) ::GetProcAddress(m_user32, "GetDpiForWindow");
 
diff --git a/intern/ghost/intern/GHOST_WindowWin32.h 
b/intern/ghost/intern/GHOST_WindowWin32.h
index 8b0ba2f1934..9d6a1b667d6 100644
--- a/intern/ghost/intern/GHOST_WindowWin32.h
+++ b/intern/ghost/intern/GHOST_WindowWin32.h
@@ -59,6 +59,9 @@ typedef BOOL (API * GHOST_WIN32_WTPacket)(HCTX, UINT, LPVOID);
 typedef BOOL (API * GHOST_WIN32_WTEnable)(HCTX, BOOL);
 typedef BOOL (API * GHOST_WIN32_WTOverlap)(HCTX, BOOL);
 
+// typedef to user32 functions to disable gestures on windows
+typedef BOOL(API * GHOST_WIN32_RegisterTouchWindow)(HWND hwnd, ULONG ulFlags);
+
 // typedefs for user32 functions to allow dynamic loading of Windows 10 DPI 
scaling functions
 typedef UINT(API * GHOST_WIN32_GetDpiForWindow)(HWND);
 #ifndef USER_DEFAULT_SCREEN_DPI

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