Giovanni Mascellani : mfplat/tests: Test that the content of DXGI buffers is discarded when locking for writing.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: f443b9e042c5c4116321303bcb069a0657705b1b
URL:    https://gitlab.winehq.org/wine/wine/-/commit/f443b9e042c5c4116321303bcb069a0...

Author: Giovanni Mascellani <gmascellani(a)codeweavers.com>
Date:   Mon Apr 17 16:21:41 2023 +0200

mfplat/tests: Test that the content of DXGI buffers is discarded when locking for writing.

---

 dlls/mfplat/tests/mfplat.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/dlls/mfplat/tests/mfplat.c b/dlls/mfplat/tests/mfplat.c
index f5fdfd0be3d..77b7b26ba9c 100644
--- a/dlls/mfplat/tests/mfplat.c
+++ b/dlls/mfplat/tests/mfplat.c
@@ -7442,7 +7442,8 @@ static void test_d3d11_surface_buffer(void)
     ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
 
     /* Lock flags are honored, so reads and writes are discarded if
-     * the flags are not correct. */
+     * the flags are not correct. Also, previous content is discarded
+     * when locking for writing and not for reading. */
     put_d3d11_texture_color(texture, 0, 0, 0xcdcdcdcd);
     hr = IMF2DBuffer2_Lock2DSize(_2dbuffer2, MF2DBuffer_LockFlags_Read, &data, &pitch, &data2, &length);
     ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
@@ -7455,6 +7456,14 @@ static void test_d3d11_surface_buffer(void)
     ok(color == 0xcdcdcdcd, "Unexpected leading dword %#lx.\n", color);
     put_d3d11_texture_color(texture, 0, 0, 0xefefefef);
 
+    hr = IMF2DBuffer2_Lock2DSize(_2dbuffer2, MF2DBuffer_LockFlags_Write, &data, &pitch, &data2, &length);
+    ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
+    ok(*(DWORD *)data != 0xefefefef, "Unexpected leading dword.\n");
+    IMF2DBuffer2_Unlock2D(_2dbuffer2);
+
+    color = get_d3d11_texture_color(texture, 0, 0);
+    ok(color != 0xefefefef, "Unexpected leading dword.\n");
+
     hr = IMF2DBuffer2_Lock2DSize(_2dbuffer2, MF2DBuffer_LockFlags_Write, &data, &pitch, &data2, &length);
     ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
     ok(*(DWORD *)data != 0xefefefef, "Unexpected leading dword.\n");