The image crate's Targa encoder let run-length packets run on from the end of
one row into the next. TGA 2.0 says a packet must not cross a scanline, and
readers that decode a row at a time misread such files: Pillow fails on them
with "buffer overrun", and texture tools and game engines reject them.
Targa is now written by our own encoder (codecs::tga), as Photoshop writes
it: RLE true colour or grayscale, every packet within its row, rows stored
bottom-up (the origin readers that ignore the descriptor assume), the alpha
bits in the descriptor and the TGA 2.0 footer. Reading stays with the image
crate.
F4LCON
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