Re: [PATCH 0/1] MR2847: gdiplus: Improve performance of gdip_transform_points.

[Bartosz Kosiorek (＠gang65)]

Bartosz Kosiorek (@gang65) commented about dlls/gdiplus/graphics.c:
> {
>              case WineCoordinateSpaceGdiDevice:
>              {
> -                GpMatrix gdixform;
> -                gdixform = graphics->gdi_transform;
> +                GpMatrix gdixform = graphics->gdi_transform;
>                  stat = GdipInvertMatrix(&gdixform);
>                  if (stat != Ok)
>                      break;
> -                GdipMultiplyMatrix(matrix, &gdixform, MatrixOrderAppend);
> +                memcpy(matrix->matrix, gdixform.matrix, 6 * sizeof(REAL));

In previous implementation we have multiplied [Identity Matrix](https://en.wikipedia.org/wiki/Identity_matrix) with GDIMatrix, and the result was always the same (GDIMatrix).
Instead of expensive Matrix Multiplication, just copy matrix, and boost perfmance.

-- 
https://gitlab.winehq.org/wine/wine/-/merge_requests/2847#note_33025