From: Massimo Del Fedele <max@veneto.com>
Date: Sun, 18 Jul 2010 10:26:09 +0000 (+0200)
Subject: DIB Engine: Hook the engine between GDI32 and Display driver
X-Git-Url: https://repo.or.cz/w/wine/hacks.git/commitdiff_plain/338da564ff580fa42965dadbf3c1405e3b5adf3d

DIB Engine: Hook the engine between GDI32 and Display driver
---

diff --git a/dlls/gdi32/driver.c b/dlls/gdi32/driver.c
index e6713ea2085..945bb77cdab 100644
--- a/dlls/gdi32/driver.c
+++ b/dlls/gdi32/driver.c
@@ -3,6 +3,7 @@
  *
  * Copyright 1994 Bob Amstadt
  * Copyright 1996, 2001 Alexandre Julliard
+ * Copyright 2009 Massimo Del Fedele
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -25,6 +26,7 @@
 #include <stdarg.h>
 #include <string.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include "windef.h"
 #include "winbase.h"
 #include "winreg.h"
@@ -214,6 +216,104 @@ static struct graphics_driver *create_driver( HMODULE module )
 
 
 /**********************************************************************
+ *	     Load_Dib_Driver
+ *
+ * Check if we want the DIB engine and try to load it
+ */
+static HMODULE Load_Dib_Driver(void)
+{
+    HMODULE module;
+    
+    static const char *winedib_drv = "winedib.drv";
+    
+    /* we do want use DIB Engine ? */
+    BOOL driverRequired = TRUE;
+    
+    /* already checked env/registry for DIB driver ? */
+    BOOL envChecked     = FALSE;
+    
+    char *winedib;
+    char buffer[10];
+    
+    /* environment variable WINEDIB takes precedence */
+    if( (winedib = getenv("WINEDIB")) != NULL)
+    {
+        if(!strcasecmp(winedib, "ON") ||
+           !strcasecmp(winedib, "TRUE") ||
+           !strcasecmp(winedib, "ENABLE") ||
+           !strcasecmp(winedib, "ENABLED")
+        )
+        {
+            TRACE("DIB Engine enabled by environment\n");
+            envChecked = TRUE;
+            driverRequired = TRUE;
+        }
+        else if(!strcasecmp(winedib, "OFF") ||
+           !strcasecmp(winedib, "FALSE") ||
+           !strcasecmp(winedib, "DISABLE") ||
+           !strcasecmp(winedib, "DISABLED")
+        )
+        {
+            TRACE("DIB Engine disabled by environment\n");
+            envChecked = TRUE;
+            driverRequired = FALSE;
+        }
+        else
+            ERR("Bad WINEDIB environment variable\n");
+    }
+        
+    /* no WINEDIB environment var found or wrong value, we check registry */
+    if(!envChecked)
+    {
+        HKEY hkey;
+        buffer[0] = 0;
+        if (!RegOpenKeyA( HKEY_CURRENT_USER, "Software\\Wine\\DIB Engine", &hkey ))
+        {
+            DWORD type, count = sizeof(buffer);
+            RegQueryValueExA( hkey, "Enable", 0, &type, (LPBYTE) buffer, &count );
+            RegCloseKey( hkey );
+        }
+        if(*buffer)
+        {
+            /* registry value found, must be Y or y to enable driver, N or n to disable */
+            if(!strncasecmp(buffer, "Y", 1))
+            {
+                TRACE("DIB Engine enabled by registry\n");
+                envChecked = TRUE;
+                driverRequired = TRUE;
+            }
+            else if(!strncasecmp(buffer, "N", 1))
+            {
+                TRACE("DIB Engine disabled by registry\n");
+                envChecked = TRUE;
+                driverRequired = FALSE;
+            }
+        }
+    }
+        
+    /* none of above, we assume we don't want to use engine */
+    if(!envChecked)
+    {
+        TRACE("DIB Engine disabled by default\n");
+        envChecked = TRUE;
+        driverRequired = FALSE;
+    }
+    
+    /* if DIB Engine is required, try to load it
+     * otherwise just return NULL module */
+    if(driverRequired)
+    {
+        if( (module = LoadLibraryA( winedib_drv )) != 0)
+            TRACE("Succesfully loaded DIB Engine\n");
+        else
+            ERR("Couldn't load DIB Engine\n");
+        return module;
+    }
+    else
+        return 0;
+}
+
+/**********************************************************************
  *	     DRIVER_get_display_driver
  *
  * Special case for loading the display driver: get the name from the config file
@@ -226,25 +326,32 @@ const DC_FUNCTIONS *DRIVER_get_display_driver(void)
     HKEY hkey;
 
     if (display_driver) return &display_driver->funcs;  /* already loaded */
-
-    strcpy( buffer, "x11" );  /* default value */
-    /* @@ Wine registry key: HKCU\Software\Wine\Drivers */
-    if (!RegOpenKeyA( HKEY_CURRENT_USER, "Software\\Wine\\Drivers", &hkey ))
+    
+    /* check at first if DIB engine is present and if we want
+     * to use it */
+    if( (module = Load_Dib_Driver()) == 0)
     {
-        DWORD type, count = sizeof(buffer);
-        RegQueryValueExA( hkey, "Graphics", 0, &type, (LPBYTE) buffer, &count );
-        RegCloseKey( hkey );
-    }
+        /* no DIB Engine loaded, just load normal display driver */
+        
+        strcpy( buffer, "x11" );  /* default value */
+        /* @@ Wine registry key: HKCU\Software\Wine\Drivers */
+        if (!RegOpenKeyA( HKEY_CURRENT_USER, "Software\\Wine\\Drivers", &hkey ))
+        {
+            DWORD type, count = sizeof(buffer);
+            RegQueryValueExA( hkey, "Graphics", 0, &type, (LPBYTE) buffer, &count );
+            RegCloseKey( hkey );
+        }
 
-    name = buffer;
-    while (name)
-    {
-        next = strchr( name, ',' );
-        if (next) *next++ = 0;
+        name = buffer;
+        while (name)
+        {
+            next = strchr( name, ',' );
+            if (next) *next++ = 0;
 
-        snprintf( libname, sizeof(libname), "wine%s.drv", name );
-        if ((module = LoadLibraryA( libname )) != 0) break;
-        name = next;
+            snprintf( libname, sizeof(libname), "wine%s.drv", name );
+            if ((module = LoadLibraryA( libname )) != 0) break;
+            name = next;
+        }
     }
 
     if (!(driver = create_driver( module )))