Liav A 5b273f3823 LibGfx: Fix TGA decoder being out of boundary after calling frame method ...

This happened because the reader was incrementing the byte index of it
after each read of a byte from the Span, so by the end of the frame
method, we could be at the end of the mapped file, so the next call
on the same decoder will just resume from that point and will be quickly
out of boundary.
To ensure this doesn't happen we only set the bitmap to m_context member
at the end of the method, and call to that method again will just give
the already-generated bitmap.
In case of setting the bitmap as volatile, we test for that case and
re-generate a reader to read the frame again correctly.

2023-01-20 17:05:09 +00:00

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