DXT DDS textures upload the file's own mip levels like 40250
CGraphicImageTexture::CreateDDSTexture (max(1, dwMipMapCount), level i read
at sum(dwLinearSize>>2k), Copy of dwLinearSize>>2i bytes) instead of a
regenerated chain. Non-DDS images keep the D3DX_DEFAULT full chain and mem:
textures get one level. The invented is_ui_tex no-mip rule (icon/, ui/,
locale/, <=128px) is deleted. dxt_decode_test is registered in ctest with
mip-level cases.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
