[PATCH 6/9] quartz/vmr7: Center the image in the VMR7 presenter.

[Henri Verbeet]

From: Henri Verbeet

---
 dlls/quartz/vmr7_presenter.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/dlls/quartz/vmr7_presenter.c b/dlls/quartz/vmr7_presenter.c
index 72571a299cb..6c6c2f350e1 100644
--- a/dlls/quartz/vmr7_presenter.c
+++ b/dlls/quartz/vmr7_presenter.c
@@ -146,6 +146,7 @@ static HRESULT WINAPI image_presenter_PresentImage(IVMRImagePresenter *iface,
         DWORD_PTR cookie, VMRPRESENTATIONINFO *info)
 {
     struct vmr7_presenter *presenter = impl_from_IVMRImagePresenter(iface);
+    SIZE dst_size;
     HRESULT hr;
     RECT rect;

@@ -167,6 +168,26 @@ static HRESULT WINAPI image_presenter_PresentImage(IVMRImagePresenter *iface,
         return E_FAIL;
     }

+    dst_size.cx = rect.right - rect.left;
+    dst_size.cy = rect.bottom - rect.top;
+
+    if (info->szAspectRatio.cx * dst_size.cy > dst_size.cx * info->szAspectRatio.cy)
+    {
+        unsigned int scaled_height = info->szAspectRatio.cy * dst_size.cx / info->szAspectRatio.cx;
+        unsigned int offset = (dst_size.cy - scaled_height) / 2;
+
+        rect.top += offset;
+        rect.bottom -= offset;
+    }
+    else if (info->szAspectRatio.cx * dst_size.cy < dst_size.cx * info->szAspectRatio.cy)
+    {
+        unsigned int scaled_width = info->szAspectRatio.cx * dst_size.cy / info->szAspectRatio.cy;
+        unsigned int offset = (dst_size.cx - scaled_width) / 2;
+
+        rect.left += offset;
+        rect.right -= offset;
+    }
+
     if (FAILED(hr = IDirectDrawSurface7_Blt(presenter->primary, &rect, info->lpSurf, NULL, DDBLT_WAIT, NULL)))
         ERR("Failed to blit, hr %#lx.\n", hr);