wincodecs: Use bottom-up orientation in BMP encoder.

dlls/windowscodecs/bmpencode.c

@@ -244,8 +244,10 @@ static HRESULT WINAPI BmpFrameEncode_WritePixels(IWICBitmapFrameEncode *iface,
     UINT lineCount, UINT cbStride, UINT cbBufferSize, BYTE *pbPixels)
 {
     BmpFrameEncode *This = impl_from_IWICBitmapFrameEncode(iface);
+    UINT dstbuffersize, bytesperrow, row;
+    BYTE *dst, *src;
     HRESULT hr;
-    WICRect rc;
+
     TRACE("(%p,%u,%u,%u,%p)\n", iface, lineCount, cbStride, cbBufferSize, pbPixels);
 
     if (!This->initialized || !This->width || !This->height || !This->format)
@@ -254,19 +256,27 @@ static HRESULT WINAPI BmpFrameEncode_WritePixels(IWICBitmapFrameEncode *iface,
     hr = BmpFrameEncode_AllocateBits(This);
     if (FAILED(hr)) return hr;
 
-    rc.X = 0;
-    rc.Y = 0;
-    rc.Width = This->width;
-    rc.Height = lineCount;
+    bytesperrow = ((This->format->bpp * This->width) + 7) / 8;
 
-    hr = copy_pixels(This->format->bpp, pbPixels, This->width, lineCount, cbStride,
-        &rc, This->stride, This->stride*(This->height-This->lineswritten),
-        This->bits + This->stride*This->lineswritten);
+    if (This->stride < bytesperrow)
+        return E_INVALIDARG;
 
-    if (SUCCEEDED(hr))
-        This->lineswritten += lineCount;
+    dstbuffersize = This->stride * (This->height - This->lineswritten);
+    if ((This->stride * (lineCount - 1)) + bytesperrow > dstbuffersize)
+        return E_INVALIDARG;
 
-    return hr;
+    src = pbPixels;
+    dst = This->bits + This->stride * (This->height - This->lineswritten - 1);
+    for (row = 0; row < lineCount; row++)
+    {
+        memcpy(dst, src, bytesperrow);
+        src += cbStride;
+        dst -= This->stride;
+    }
+
+    This->lineswritten += lineCount;
+
+    return S_OK;
 }
 
 static HRESULT WINAPI BmpFrameEncode_WriteSource(IWICBitmapFrameEncode *iface,
@@ -313,7 +323,7 @@ static HRESULT WINAPI BmpFrameEncode_Commit(IWICBitmapFrameEncode *iface)
 
     bih.bV5Size = info_size = sizeof(BITMAPINFOHEADER);
     bih.bV5Width = This->width;
-    bih.bV5Height = -This->height; /* top-down bitmap */
+    bih.bV5Height = This->height;
     bih.bV5Planes = 1;
     bih.bV5BitCount = This->format->bpp;
     bih.bV5Compression = This->format->compression;

dlls/windowscodecs/tests/converter.c

@@ -663,7 +663,6 @@ static void check_bmp_format(IStream *stream, const struct bitmap_data *data)
 
     ok(bih.biSize == sizeof(bih), "Unexpected header size %d.\n", bih.biSize);
     ok(bih.biWidth == data->width, "Unexpected bitmap width %d.\n", bih.biWidth);
-todo_wine
     ok(bih.biHeight == data->height, "Unexpected bitmap height %d.\n", bih.biHeight);
     ok(bih.biPlanes == 1, "Unexpected planes count %d.\n", bih.biPlanes);