Added TGA, BMP and PSD readers. Added TGA and BMP writers.

[ggarra13]

They are very light as they rely on two auxiliary .h files (stb_image.h and stb_image_writer.h).

[darbyjohnston]

Looks like an interesting addition, though to be honest I was hoping to leave some of the older formats like TGA behind (DJV has TGA support which I did not port over to tlRender). On the other hand it's not a huge amount of code which is good.

My main concern would be if STB handles reading images from memory? That's necessary for the .otioz support which is essential. Also tests would need to be added similar to the other image formats in "tests\tlIOTest".

Adding these formats also brings up the question of whether to use OpenImageIO instead. That project was recently adopted by ASWF and aligns with the other dependencies like OpenColorIO and OpenTimelineIO. It has support for TGA and BMP, and also others like SGI which would actually remove code from tlRender which would be great.

[ggarra13]

My main concern would be if STB handles reading images from memory? That's necessary for the .otioz support which is essential. Also tests would need to be added similar to the other image formats in "tests\tlIOTest".

It does handle images from memory. I added code for it now, but I didn't know how to test it. I also added a STBTest.cpp/.h based on the SGITest but also didn't know how to test it. Can you test them and see if they are okay?

[darbyjohnston]

You can run the tests like:

• make test (when using the CMake Makefile generator)
• run the test binary directly: tests/tltest/tltest

To test reading from memory you can use an .otioz file. However the "otioconvert" utility doesn't support image sequences yet, but I have a PR to fix that:
AcademySoftwareFoundation/OpenTimelineIO#1627

[darbyjohnston]

Thanks!