[PATCH 1/2] windowscodecs/tests: Introduce create_and_init_encoder.

[Ziqing Hui]

We can't reuse same encoder object for all images. So we should create
a new encoder object for each test.

Signed-off-by: Ziqing Hui <zhui(a)codeweavers.com>
---
 dlls/windowscodecs/tests/ddsformat.c | 77 +++++++++++++++++-----------
 1 file changed, 47 insertions(+), 30 deletions(-)