406cfd214a
The goal is to make it more explicit and centralized operation to assign and steal buffer data, with proper ownership tracking. The buffers and ownership flags are wrapped into their dedicated structures now. There should be no functional changes currently, it is a preparation for allowing implicit sharing of the ImBuf buffers. Additionally, in the future it is possible to more buffer-specific information (such as color space) next to the buffer data itself. It is also possible to clean up the allocation flags (IB_rect, ...) to give them more clear naming and not have stored in the ImBuf->flags as they are only needed for allocation. The most dangerous part of this change is the change of byte buffer data from `int*` to `uint8_t*`. In a lot of cases the byte buffer was cast to `uchar*`, so those casts are now gone. But some code is operating on `int*` so now there are casts in there. In practice this should be fine, since we only support 64bit platforms, so allocations are aligned. The real things to watch out for here is the fact that allocation and offsetting from the byte buffer now need an explicit 4 channel multiplier. Once everything is C++ it will be possible to simplify public functions even further. Pull Request: https://projects.blender.org/blender/blender/pulls/107609
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