[PATCH 4/8] windowscodecs/tests: Introduce is_compressed().

[Ziqing Hui]

Signed-off-by: Ziqing Hui <zhui(a)codeweavers.com>
---
 dlls/windowscodecs/tests/ddsformat.c | 38 ++++++++++++++++++----------
 1 file changed, 25 insertions(+), 13 deletions(-)