371ad2658c
... and add per-strile offset/bytecount loading capabilities. Part of this commit makes the behaviour that was previously met when libtiff was compiled with -DDEFER_STRILE_LOAD available for default builds when specifying the new 'D' (Deferred) TIFFOpen() flag. In that mode, the [Tile/Strip][ByteCounts/Offsets] arrays are only loaded when first accessed. This can speed-up the opening of files stored on the network when just metadata retrieval is needed. This mode has been used for years by the GDAL library when compiled with its embeded libtiff copy. To avoid potential out-of-tree code (typically codecs) that would use the td_stripbytecount and td_stripoffset array inconditionnaly assuming they have been loaded, those have been suffixed with _p (for protected). The use of the new functions mentionned below is then recommended. Another addition of this commit is the capability of loading only the values of the offset/bytecount of the strile of interest instead of the whole array. This is enabled with the new 'O' (Ondemand) flag of TIFFOpen() (which implies 'D'). That behaviour has also been used by GDAL, which hacked into the td_stripoffset/td_stripbytecount arrays directly. The new code added in the _TIFFFetchStrileValue() and _TIFFPartialReadStripArray() internal functions is mostly a port of what was in GDAL GTiff driver previously. Related to that, the public TIFFGetStrileOffset[WithErr]() and TIFFGetStrileByteCount[WithErr]() functions have been added to API. They are of particular interest when using sparse files (with offset == bytecount == 0) and you want to detect if a strile is present or not without decompressing the data, or updating an existing sparse file. They will also be used to enable a future enhancement where client code can entirely skip bytecount loading in some situtations A new test/defer_strile_loading.c test has been added to test the above capabilities.
73 lines
1.1 KiB
Plaintext
73 lines
1.1 KiB
Plaintext
aclocal.m4
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autom4te.cache
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configure
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Makefile.in
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config/compile
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config/config.guess
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config/config.sub
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config/depcomp
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config/install-sh
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config/ltmain.sh
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config/missing
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config/mkinstalldirs
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config/test-driver
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**/Makefile
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*.o
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*.la
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*.lo
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.deps
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.libs
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config.log
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config.status
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contrib/addtiffo/addtiffo
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contrib/dbs/tiff-bi
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contrib/dbs/tiff-grayscale
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contrib/dbs/tiff-palette
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contrib/dbs/tiff-rgb
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contrib/iptcutil/iptcutil
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libtiff-4.pc
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libtiff/mkg3states
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libtiff/stamp-h1
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libtiff/stamp-h2
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libtiff/tif_config.h
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libtiff/tif_config.h.in
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libtiff/tiffconf.h
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libtool
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m4/libtool.m4
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m4/ltoptions.m4
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m4/ltsugar.m4
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m4/ltversion.m4
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m4/lt~obsolete.m4
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tools/fax2ps
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tools/fax2tiff
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tools/pal2rgb
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tools/ppm2tiff
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tools/raw2tiff
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tools/rgb2ycbcr
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tools/thumbnail
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tools/tiff2bw
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tools/tiff2pdf
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tools/tiff2ps
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tools/tiff2rgba
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tools/tiffcmp
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tools/tiffcp
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tools/tiffcrop
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tools/tiffdither
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tools/tiffdump
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tools/tiffgt
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tools/tiffinfo
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tools/tiffmedian
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tools/tiffset
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tools/tiffsplit
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test/ascii_tag
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test/custom_dir
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test/long_tag
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test/raw_decode
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test/rewrite
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test/short_tag
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test/strip_rw
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test/defer_strile_loading
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test/*.log
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test/*.trs
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test/o-*
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