[PATCH 2/2] windowscodecs: Implement DdsDecoder_Initialize().

[Ziqing Hui]

DDS file layout can been found here: https://docs.microsoft.com/en-us/windows/win32/direct3ddds/dx-graphics-dds-p...

Signed-off-by: Ziqing Hui 
---
 dlls/windowscodecs/ddsformat.c       | 81 +++++++++++++++++++++++++++-
 dlls/windowscodecs/tests/ddsformat.c |  4 +-
 2 files changed, 81 insertions(+), 4 deletions(-)