diff --git a/dlls/d3dx9_36/d3dx9_36_private.h b/dlls/d3dx9_36/d3dx9_36_private.h
index 860583ff86f..125ebbcaaf5 100644
--- a/dlls/d3dx9_36/d3dx9_36_private.h
+++ b/dlls/d3dx9_36/d3dx9_36_private.h
@@ -76,9 +76,10 @@ void convert_argb_pixels(const BYTE *src, UINT src_row_pitch, UINT src_slice_pit
     const struct volume *src_size, const struct pixel_format_desc *src_format,
     BYTE *dst, UINT dst_row_pitch, UINT dst_slice_pitch, const struct volume *dst_size,
     const struct pixel_format_desc *dst_format, D3DCOLOR color_key) DECLSPEC_HIDDEN;
-void point_filter_simple_data(const BYTE *src, UINT src_row_pitch, UINT src_slice_pitch, struct volume *src_size, const struct pixel_format_desc *src_format,
-        BYTE *dst, UINT dst_row_pitch, UINT dst_slice_pitch, struct volume *dst_size, const struct pixel_format_desc *dst_format,
-        D3DCOLOR color_key) DECLSPEC_HIDDEN;
+void point_filter_argb_pixels(const BYTE *src, UINT src_row_pitch, UINT src_slice_pitch,
+    const struct volume *src_size, const struct pixel_format_desc *src_format,
+    BYTE *dst, UINT dst_row_pitch, UINT dst_slice_pitch, const struct volume *dst_size,
+    const struct pixel_format_desc *dst_format, D3DCOLOR color_key) DECLSPEC_HIDDEN;
 
 HRESULT load_texture_from_dds(IDirect3DTexture9 *texture, const void *src_data, const PALETTEENTRY *palette,
     DWORD filter, D3DCOLOR color_key, const D3DXIMAGE_INFO *src_info) DECLSPEC_HIDDEN;
diff --git a/dlls/d3dx9_36/surface.c b/dlls/d3dx9_36/surface.c
index 4641039b7f0..14df4ff5ff4 100644
--- a/dlls/d3dx9_36/surface.c
+++ b/dlls/d3dx9_36/surface.c
@@ -1454,16 +1454,16 @@ void convert_argb_pixels(const BYTE *src, UINT src_row_pitch, UINT src_slice_pit
 }
 
 /************************************************************
- * point_filter_simple_data
+ * point_filter_argb_pixels
  *
  * Copies the source buffer to the destination buffer, performing
  * any necessary format conversion, color keying and stretching
  * using a point filter.
  * Works only for ARGB formats with 1 - 4 bytes per pixel.
  */
-void point_filter_simple_data(const BYTE *src, UINT src_row_pitch, UINT src_slice_pitch, struct volume *src_size,
+void point_filter_argb_pixels(const BYTE *src, UINT src_row_pitch, UINT src_slice_pitch, const struct volume *src_size,
         const struct pixel_format_desc *src_format, BYTE *dst, UINT dst_row_pitch, UINT dst_slice_pitch,
-        struct volume *dst_size, const struct pixel_format_desc *dst_format, D3DCOLOR color_key)
+        const struct volume *dst_size, const struct pixel_format_desc *dst_format, D3DCOLOR color_key)
 {
     struct argb_conversion_info conv_info, ck_conv_info;
     const struct pixel_format_desc *ck_format = NULL;
@@ -1701,7 +1701,7 @@ HRESULT WINAPI D3DXLoadSurfaceFromMemory(IDirect3DSurface9 *dst_surface,
 
             /* Always apply a point filter until D3DX_FILTER_LINEAR,
              * D3DX_FILTER_TRIANGLE and D3DX_FILTER_BOX are implemented. */
-            point_filter_simple_data(src_memory, src_pitch, 0, &src_size, srcformatdesc,
+            point_filter_argb_pixels(src_memory, src_pitch, 0, &src_size, srcformatdesc,
                     lockrect.pBits, lockrect.Pitch, 0, &dst_size, destformatdesc, color_key);
         }
 
diff --git a/dlls/d3dx9_36/volume.c b/dlls/d3dx9_36/volume.c
index 51153682307..1e19d9d6604 100644
--- a/dlls/d3dx9_36/volume.c
+++ b/dlls/d3dx9_36/volume.c
@@ -220,7 +220,7 @@ HRESULT WINAPI D3DXLoadVolumeFromMemory(IDirect3DVolume9 *dst_volume,
             if ((filter & 0xf) != D3DX_FILTER_POINT)
                 FIXME("Unhandled filter %#x.\n", filter);
 
-            point_filter_simple_data(src_addr, src_row_pitch, src_slice_pitch, &src_size, src_format_desc,
+            point_filter_argb_pixels(src_addr, src_row_pitch, src_slice_pitch, &src_size, src_format_desc,
                     locked_box.pBits, locked_box.RowPitch, locked_box.SlicePitch, &dst_size, dst_format_desc, color_key);
         }