[tkreuzer] 38328: - Put Dx values at start of buffer to have alignemnt of 4 - increase size of stack buffer to 100, results in >90% buffer hits - Handle Dy values when ETO_PDY is specified (patch by Alexander Potashev, aspotashev at gmail dot com) See issue #3958 for more details.

Author: tkreuzer
Date: Wed Dec 24 09:35:40 2008
New Revision: 38328

URL: http://svn.reactos.org/svn/reactos?rev=38328&view=rev
Log:
- Put Dx values at start of buffer to have alignemnt of 4
- increase size of stack buffer to 100, results in >90% buffer hits
- Handle Dy values when ETO_PDY is specified (patch by Alexander Potashev, aspotashev at
gmail dot com)

See issue #3958 for more details.

Modified:
    trunk/reactos/subsystems/win32/win32k/objects/freetype.c

Modified: trunk/reactos/subsystems/win32/win32k/objects/freetype.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/win32/win32k/ob…
==============================================================================
--- trunk/reactos/subsystems/win32/win32k/objects/freetype.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/win32/win32k/objects/freetype.c [iso-8859-1] Wed Dec 24
09:35:40 2008
@@ -3603,6 +3603,12 @@
             TextLeft += Dx[i<<DxShift] << 6;
 //         DbgPrint("new TextLeft2: %d\n", TextLeft);
         }
+
+        if (DxShift)
+        {
+            TextTop -= Dx[2 * i + 1] << 6;
+        }
+
         previous = glyph_index;
 
         String++;
@@ -3651,7 +3657,7 @@
     return FALSE;
 }
 
-#define STACK_TEXT_BUFFER_SIZE 50
+#define STACK_TEXT_BUFFER_SIZE 100
 BOOL
 APIENTRY
 NtGdiExtTextOutW(
@@ -3706,17 +3712,19 @@
         /* Probe and copy user mode data to the buffer */
         _SEH2_TRY
         {
+            /* Put the Dx before the String to assure alignment of 4 */
+            SafeString = (LPWSTR)(((ULONG_PTR)Buffer) + DxSize);
+
             /* Probe and copy the string */
             ProbeForRead(UnsafeString, StringSize, 1);
-            SafeString = Buffer;
             memcpy((PVOID)SafeString, UnsafeString, StringSize);
 
             /* If we have Dx values... */
             if (UnsafeDx)
             {
                 /* ... probe and copy them */
+                SafeDx = Buffer;
                 ProbeForRead(UnsafeDx, DxSize, 1);
-                SafeDx = (LPINT)(((ULONG_PTR)Buffer) + StringSize);
                 memcpy(SafeDx, UnsafeDx, DxSize);
             }
         }