the imageData->m_mem is mess up

[manuel76413]

I try to load a dds file, but when read the image data by following code
and convert save it to png format

` auto lr = dds.Load(dds_file.data(), dds_file.size());
if (tinyddsloader::Result::Success == lr) {
uint32_t w = dds.GetWidth();
uint32_t h = dds.GetHeight();
uint32_t c = dds.GetDepth();
uint32_t m = dds.GetMipCount();
uint32_t s = dds.GetArraySize();
sprintf(filename, "D:/crn/%s_%d.png", ndkey.path().c_str(), ndkey.epoch());
for (uint32_t arrayIdx = 0; arrayIdx < dds.GetArraySize(); arrayIdx++) {
for (uint32_t mipIdx = 0; mipIdx < dds.GetMipCount(); mipIdx++) {
const auto* imageData = dds.GetImageData(mipIdx, arrayIdx);
void* data = imageData->m_mem;
stbi_write_png(filename, w, h, c, data, 3* w * c);
}
}
}

however, the output png is mess up, not correct!
`

[benikabocha]

Which is the DXGIFormat of the DDS file?
If it is a compressed type, then ImageData::m_mem is compressed.

[ItsBrank]

Which is the DXGIFormat of the DDS file? If it is a compressed type, then ImageData::m_mem is compressed.

Does that mean this library doesn't do any sort of decompression? I see theres utils for flipping images and detecting compression, but I don't see anything that lets you decompress the pixel data.

[benikabocha]

Does that mean this library doesn't do any sort of decompression?

Yes. DirectX/OpenGL can load compressed images.

I see theres utils for flipping images and detecting compression, but I don't see anything that lets you decompress the pixel data.

Flip compressed images only supports the following formats:

• BC1
• BC2
• BC3
• BC4
• BC5

This site may be helpful:
https://learn.microsoft.com/en-us/windows/win32/direct3d9/opaque-and-1-bit-alpha-textures

[ItsBrank]

I wasn't asking about dx I was asking about this repo, you mess with compression but I don't see any way to decompress blocks (like for exporting to a png).