Nikolay Sivov (@nsivov) commented about dlls/d2d1/d2d1_private.h:
struct d2d_transform_node {
- ID2D1TransformNode *node;
- BOOL effect_input;
- union
- {
ID2D1TransformNode *transform;
ID2D1Bitmap *bitmap;
- } u;
"bitmap" field is not used anywhere. Same for effect_input I think.