diff --git a/dlls/d3dx9_36/d3dx9_36_private.h b/dlls/d3dx9_36/d3dx9_36_private.h
index a7efbee14d8..860583ff86f 100644
--- a/dlls/d3dx9_36/d3dx9_36_private.h
+++ b/dlls/d3dx9_36/d3dx9_36_private.h
@@ -72,9 +72,10 @@ HRESULT write_buffer_to_file(const WCHAR *filename, ID3DXBuffer *buffer) DECLSPE
 const struct pixel_format_desc *get_format_info(D3DFORMAT format) DECLSPEC_HIDDEN;
 const struct pixel_format_desc *get_format_info_idx(int idx) DECLSPEC_HIDDEN;
 
-void copy_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 convert_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;
 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;
diff --git a/dlls/d3dx9_36/surface.c b/dlls/d3dx9_36/surface.c
index d49730d5c81..4641039b7f0 100644
--- a/dlls/d3dx9_36/surface.c
+++ b/dlls/d3dx9_36/surface.c
@@ -504,7 +504,7 @@ static HRESULT save_dds_surface_to_memory(ID3DXBuffer **dst_buffer, IDirect3DSur
     volume.width = src_desc.Width;
     volume.height = src_desc.Height;
     volume.depth = 1;
-    copy_simple_data(locked_rect.pBits, locked_rect.Pitch, 0, &volume, pixel_format,
+    convert_argb_pixels(locked_rect.pBits, locked_rect.Pitch, 0, &volume, pixel_format,
         pixels, dst_pitch, 0, &volume, pixel_format, 0);
 
     IDirect3DSurface9_UnlockRect(src_surface);
@@ -1355,16 +1355,16 @@ static void format_from_vec4(const struct pixel_format_desc *format, const struc
 }
 
 /************************************************************
- * copy_simple_data
+ * convert_argb_pixels
  *
  * Copies the source buffer to the destination buffer, performing
  * any necessary format conversion and color keying.
  * Pixels outsize the source rect are blacked out.
  * Works only for ARGB formats with 1 - 4 bytes per pixel.
  */
-void copy_simple_data(const BYTE *src, UINT src_row_pitch, UINT src_slice_pitch, struct volume *src_size,
+void convert_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;
@@ -1691,7 +1691,7 @@ HRESULT WINAPI D3DXLoadSurfaceFromMemory(IDirect3DSurface9 *dst_surface,
 
         if ((filter & 0xf) == D3DX_FILTER_NONE)
         {
-            copy_simple_data(src_memory, src_pitch, 0, &src_size, srcformatdesc,
+            convert_argb_pixels(src_memory, src_pitch, 0, &src_size, srcformatdesc,
                     lockrect.pBits, lockrect.Pitch, 0, &dst_size, destformatdesc, color_key);
         }
         else /* if ((filter & 0xf) == D3DX_FILTER_POINT) */
@@ -1976,7 +1976,7 @@ HRESULT WINAPI D3DXSaveSurfaceToFileInMemory(ID3DXBuffer **dst_buffer, D3DXIMAGE
             hr = IDirect3DSurface9_LockRect(src_surface, &locked_rect, src_rect, D3DLOCK_READONLY);
             if (SUCCEEDED(hr))
             {
-                copy_simple_data(locked_rect.pBits, locked_rect.Pitch, 0, &size, src_format_desc,
+                convert_argb_pixels(locked_rect.pBits, locked_rect.Pitch, 0, &size, src_format_desc,
                     dst_data, dst_pitch, 0, &size, dst_format_desc, 0);
                 IDirect3DSurface9_UnlockRect(src_surface);
             }
diff --git a/dlls/d3dx9_36/volume.c b/dlls/d3dx9_36/volume.c
index f773c7faa16..51153682307 100644
--- a/dlls/d3dx9_36/volume.c
+++ b/dlls/d3dx9_36/volume.c
@@ -212,7 +212,7 @@ HRESULT WINAPI D3DXLoadVolumeFromMemory(IDirect3DVolume9 *dst_volume,
 
         if ((filter & 0xf) == D3DX_FILTER_NONE)
         {
-            copy_simple_data(src_memory, src_row_pitch, src_slice_pitch, &src_size, src_format_desc,
+            convert_argb_pixels(src_memory, 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);
         }
         else