Only use PAL8 if palette is present, else use GRAY8 for pixfmt.

Instead of simulating a grayscale palette, use real grayscale pixels, if no
palette is actually defined.
Signed-off-by: Diego Elio Pettenò <flameeyes@flameeyes.eu>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

This reverts commit b31d76e4 as it
uses an unkown pixel format.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

Also add additional known values and log as missing features.

The spec does not specify that 0 is an error condition, and there
are samples which use 0 when the whole image is in one strip.

Based on a patch by Paul B Mahol <onemda@gmail.com>

CC:libav-stable@libav.org

Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>

At least 2 bytes from the source are read every loop.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org

Return the proper error values and optionally report them.

Report when zlib support is missing.

It's got_frame, not data size

It will be useful in the upcoming transition to refcounted AVFrames.

It is only used in that library.

Tested with the GraphicsMagick TIFF archive and Libav generated files.

Signed-off-by: Martin Storsjö <martin@martin.st>

Also break some long lines, remove codec function placeholder comments
and add spaces in sample/pixel format lists.
Signed-off-by: Martin Storsjö <martin@martin.st>

Also remove one pointless zero initialization in rangecoder.c.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org

TIFF v6.0 (unimplemented) adds signed equivalents.

Signed-off-by: Janne Grunau <janne-libav@jannau.net>

It's more readable and less prone to breakage.