[PATCH] d3dx9: Favour source rect position in D3DXLoadSurfaceFromMemory().

[Paul Gofman]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=41936
Signed-off-by: Paul Gofman <gofmanp(a)gmail.com>
---
 dlls/d3dx9_36/surface.c       | 9 ++++++++-
 dlls/d3dx9_36/tests/surface.c | 9 +++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/dlls/d3dx9_36/surface.c b/dlls/d3dx9_36/surface.c
index 8e9b834d88..8b85c97e8b 100644
--- a/dlls/d3dx9_36/surface.c
+++ b/dlls/d3dx9_36/surface.c
@@ -1836,10 +1836,10 @@ HRESULT WINAPI D3DXLoadSurfaceFromMemory(IDirect3DSurface9 *dst_surface,
         DWORD filter, D3DCOLOR color_key)
 {
     const struct pixel_format_desc *srcformatdesc, *destformatdesc;
+    struct volume src_size, dst_size;
     IDirect3DSurface9 *surface;
     D3DSURFACE_DESC surfdesc;
     D3DLOCKED_RECT lockrect;
-    struct volume src_size, dst_size;
     HRESULT hr;
 
     TRACE("(%p, %p, %s, %p, %#x, %u, %p, %s, %#x, 0x%08x)\n",
@@ -1899,6 +1899,13 @@ HRESULT WINAPI D3DXLoadSurfaceFromMemory(IDirect3DSurface9 *dst_surface,
     if (FAILED(hr = lock_surface(dst_surface, dst_rect, &lockrect, &surface, TRUE)))
         return hr;
 
+    if (!(src_rect->left & (srcformatdesc->block_width - 1)
+            || src_rect->top & (srcformatdesc->block_height - 1)))
+        src_memory = (BYTE *)src_memory + src_rect->top * src_pitch + src_rect->left
+                * srcformatdesc->bytes_per_pixel;
+    else
+        FIXME("Source rect position is misaligned, src_rect %s.\n", wine_dbgstr_rect(src_rect));
+
     if (src_format == surfdesc.Format
             && dst_size.width == src_size.width
             && dst_size.height == src_size.height
diff --git a/dlls/d3dx9_36/tests/surface.c b/dlls/d3dx9_36/tests/surface.c
index 4a10492a08..2c7e088f06 100644
--- a/dlls/d3dx9_36/tests/surface.c
+++ b/dlls/d3dx9_36/tests/surface.c
@@ -980,6 +980,15 @@ static void test_D3DXLoadSurface(IDirect3DDevice9 *device)
         check_pixel_4bpp(&lockrect, 1, 1, 0xc3f04c39);
         IDirect3DSurface9_UnlockRect(surf);
 
+        SetRect(&rect, 1, 1, 2, 2);
+        SetRect(&destrect, 0, 0, 1, 1);
+        hr = D3DXLoadSurfaceFromMemory(surf, NULL, &destrect, pixdata_a8b8g8r8, D3DFMT_A8B8G8R8,
+                8, NULL, &rect, D3DX_FILTER_NONE, 0);
+        ok(hr == D3D_OK, "Got unexpected hr %#x.\n", hr);
+        IDirect3DSurface9_LockRect(surf, &lockrect, NULL, D3DLOCK_READONLY);
+        check_pixel_4bpp(&lockrect, 0, 0, 0x8df62bc3);
+        IDirect3DSurface9_UnlockRect(surf);
+
         SetRect(&rect, 0, 0, 2, 2);
 
         hr = D3DXLoadSurfaceFromMemory(surf, NULL, NULL, pixdata_a2r10g10b10, D3DFMT_A2R10G10B10,
-- 
2.21.0