I assume that `source != target' is true for `FT_Bitmap_Convert' (esp. since
there is some reallocating going on). I suggest putting a quick note into
the docs to clarify that and probably extend the entry check:
```
diff --git a/src/base/ftbitmap.c b/src/base/ftbitmap.c
index c04eec43..6037538d 100644
--- a/src/base/ftbitmap.c
+++ b/src/base/ftbitmap.c
@@ -528,7 +528,7 @@
if ( !library )
return FT_THROW( Invalid_Library_Handle );
- if ( !source || !target )
+ if ( !source || !target || source == target )
return FT_THROW( Invalid_Argument );
memory = library->memory;
'''
Further, I believe that similar rules apply to `FT_Bitmap_Blend'.
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