[Development] qdds image format

[Giuseppe D'Angelo]

Il 15/04/2018 17:32, Иван Комиссаров ha scritto:
> Hello, what happened to the qdds image plugin?
> I found the note in the docs: "For security reasons, the Direct Draw 
> Surface (DDS) handler is not built by default since Qt 5.8" but could 
> not find any open issues.
> Does anyone know what are those "security reasons"?

The usual amount of parsing a file without doing bounds checks, so 
making the user vulnerable to crashes / code execution / overflows and 
the like.

> What need to be done to return the plugin to the default build?

Build it yourself; as far as I know it's still shipped as part of 
qtimageformats.

Apart from the quality of the implementation, there is close to zero 
reasons to use DDS as an image format plugin in Qt: a DDS file 
represents a texture, not an image (so the generic access through 
QImageReader isn't enough), and QImage can't represent the formats that 
you can store in a DDS anyhow.

Note that the above has nothing to do with DDS support in Qt3D, which 
has never used the image format plugin.

Hope this helps,
-- 
Giuseppe D'Angelo | giuseppe.dangelo at kdab.com | Senior Software Engineer
KDAB (France) S.A.S., a KDAB Group company
Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com
KDAB - The Qt, C++ and OpenGL Experts

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