--- a/jdk/src/windows/native/sun/java2d/d3d/D3DBlitLoops.cpp	Tue Nov 18 17:16:27 2008 -0800
+++ b/jdk/src/windows/native/sun/java2d/d3d/D3DBlitLoops.cpp	Tue Nov 18 18:32:31 2008 -0800
@@ -221,12 +221,17 @@
                 " srctype=%d rect={%-4d, %-4d, %-4d, %-4d}",
                 srctype, r.left, r.top, r.right, r.bottom);
 
-    if (pDesc->Usage == D3DUSAGE_DYNAMIC &&
-        dstx == 0 && dstx == 0 &&
-        srcWidth == pDesc->Width && srcHeight == pDesc->Height)
-    {
+    if (pDesc->Usage == D3DUSAGE_DYNAMIC) {
+        // it is safe to lock with discard because we don't care about the
+        // contents of dynamic textures, and some drivers are happier if
+        // dynamic textures are always locked with DISCARD
         dwLockFlags |= D3DLOCK_DISCARD;
         pR = NULL;
+    } else {
+        // in non-DYNAMIC case we lock the exact rect so there's no need to
+        // offset the destination pointer
+        dstx = 0;
+        dsty = 0;
     }
 
     res = pDstSurface->LockRect(&lockedRect, pR, dwLockFlags);
@@ -243,7 +248,9 @@
     void *pSrcBase = PtrCoord(pSrcInfo->rasBase,
                               srcx, pSrcInfo->pixelStride,
                               srcy, pSrcInfo->scanStride);
-    void *pDstBase = lockedRect.pBits;
+    void *pDstBase = PtrCoord(lockedRect.pBits,
+                              dstx, dstInfo.pixelStride,
+                              dsty, dstInfo.scanStride);
 
     switch (srctype) {
         case ST_INT_ARGB:

--- a/jdk/src/windows/native/sun/java2d/d3d/D3DContext.cpp	Tue Nov 18 17:16:27 2008 -0800
+++ b/jdk/src/windows/native/sun/java2d/d3d/D3DContext.cpp	Tue Nov 18 18:32:31 2008 -0800
@@ -1174,11 +1174,10 @@
         " rect={%-4d, %-4d, %-4d, %-4d}",
         r.left, r.top, r.right, r.bottom);
 
-    // REMIND: we should also check for dstx, dsty being 0 here,
-    // but they're always 0 in dynamic texture case
-    if (pDesc->Usage == D3DUSAGE_DYNAMIC &&
-        srcWidth == pDesc->Width && srcHeight == pDesc->Height)
-    {
+    if (pDesc->Usage == D3DUSAGE_DYNAMIC) {
+        // it is safe to lock with discard because we don't care about the
+        // contents of dynamic textures and dstx,dsty for this case is
+        // always 0,0 because we are uploading into a tile texture
         dwLockFlags |= D3DLOCK_DISCARD;
         pR = NULL;
     }