[PATCH v2 1/1] windowscodecs: Fix the bug when the input palette hpal is NULL in ImagingFactory_CreateBitmapFromHBITMAP.

[yangkun]

From: yangkun

When the palette is given NULL and the format is 1/4/8bppIndexed, palette info is lost. It causes incorrect color calculation when the WIC interface is called later.

Signed-off-by: yangkun 
Change-Id: I851373e9186dc815488235f0fc219d8fbdd91658
---
 dlls/windowscodecs/imgfactory.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/dlls/windowscodecs/imgfactory.c b/dlls/windowscodecs/imgfactory.c
index e2ffd6da3f4..9cb2a56c1d1 100644
--- a/dlls/windowscodecs/imgfactory.c
+++ b/dlls/windowscodecs/imgfactory.c
@@ -791,6 +791,21 @@ static HRESULT WINAPI ImagingFactory_CreateBitmapFromHBITMAP(IWICImagingFactory2
         bmi->bmiHeader.biHeight = -bm.bmHeight;
         GetDIBits(hdc, hbm, 0, bm.bmHeight, buffer, bmi, DIB_RGB_COLORS);

+        if (!hpal &&
+            (IsEqualGUID(&format, &GUID_WICPixelFormat1bppIndexed) ||
+            IsEqualGUID(&format, &GUID_WICPixelFormat4bppIndexed) ||
+            IsEqualGUID(&format, &GUID_WICPixelFormat8bppIndexed)))
+        {
+            num_palette_entries = bmi->bmiHeader.biClrUsed ? bmi->bmiHeader.biClrUsed : (UINT)(1 << bmi->bmiHeader.biBitCount);
+            for (UINT i = 0; i < num_palette_entries; i++)
+            {
+                entry[i].peRed = bmi->bmiColors[i].rgbRed;
+                entry[i].peGreen = bmi->bmiColors[i].rgbGreen;
+                entry[i].peBlue = bmi->bmiColors[i].rgbBlue;
+                entry[i].peFlags = 0;
+            }
+        }
+
         DeleteDC(hdc);
         IWICBitmapLock_Release(lock);