PNG compression level setting API: this allows the various compression settings
controlling deflate, fitlering, and so on to be set via a single setting with
six values. This is currently documented in png.h ("Write compression
settings").
Internally the compression settings have been tuned both for the overall setting
and for any specific settings made by the original APIs.
APIs to control iCCP chunk compression separately have been added.
contrib/examples/pngcp.c has been modified to accomodate the new compression
setting and to include options for separate control of iCCP chunk compression.
The new ABI, png_setting, has been modified to accomodate a wider range of
settings and most of the old compression control ABIs have been replaced by
function-like macros with the same API which call png_setting. This is an API
check in 1.7.0 for png_setting (alone). png_setting now handles all of
png_set_option. This eliminates 19 ABIs at the cost of adding 1 (png_setting).
CRC and benign error checking has been updated internally to use bit-fields and
the CRC calculation skip when the CRC is not used has been improved slightly to
avoid the initialization of the CRC. A new png_setting based API allows more
detailed control of benign error/warning messages (this may change, the internal
error handling seems too complex.) The ERROR_NUMBERS support has been removed
with the intent of implementing proper i18n.
The memcpy-size-0 issue in png_push_fill_buffer has been fixed, with an
appropriate debug() assert if a fill for 0 bytes occurs.
Most PNG_FLAG_ values for png_struct::flags have been eliminated (as a result of
the benign error handling changes). Only one remains.
Signed-off-by: John Bowler <jbowler@acm.org>
Now that the code works consistently so that these just switch off the support
for having libpng do the interlace/deinterlace the old names make more sense,
restoring them avoids cruft in the configuration file and avoids an unnecessary
version specific change.
Signed-off-by: John Bowler <jbowler@acm.org>
commit fc4b42b1d56f95efeb1b9fe42dc35b7d98d246bb
Merge: 74516c7 9eb1413
Author: John Bowler <jbowler@acm.org>
Date: Sun Nov 22 19:37:54 2015 -0800
Merge branch 'libpng17' into libpng17-filter-enhancements
commit 74516c7257f1a28a69985684c5673caa390c700a
Author: John Bowler <jbowler@acm.org>
Date: Sun Nov 22 19:32:43 2015 -0800
Make check full pass on gcc/g++ x86_64
Signed-off-by: John Bowler <jbowler@acm.org>
commit e891e34737fc0bc9ee873a5d56b83c1e777b990c
Author: John Bowler <jbowler@acm.org>
Date: Sun Nov 22 12:01:37 2015 -0800
Checkpoint: write buffering changes
This version fails in pngvalid --size because of an error handling very narrow
images, otherwise a standard build passes make check.
Signed-off-by: John Bowler <jbowler@acm.org>
commit 457a046ebdab737eefb477126cf855e49df6de50
Author: John Bowler <jbowler@acm.org>
Date: Sun Nov 22 06:39:36 2015 -0800
Fix previous bad merge
commit b4f426c97267317637d43f41fe0b05d1659bc63d
Merge: 07b9b90 a3458a6
Author: John Bowler <jbowler@acm.org>
Date: Sun Nov 22 06:32:34 2015 -0800
Merge branch 'libpng17' into libpng17-filter-enhancements
commit 07b9b90dfd653b744dbc3710b096facf6b4605f6
Merge: ed43306 5592e0b
Author: John Bowler <jbowler@acm.org>
Date: Sat Nov 21 17:07:23 2015 -0800
Merge branch 'libpng17' into libpng17-filter-enhancements
commit ed43306599f7039a90187862db82273fca3a4c3d
Merge: 772aed7 d3c0359
Author: John Bowler <jbowler@acm.org>
Date: Tue Nov 17 17:47:26 2015 -0800
Merge branch 'libpng17' into libpng17-filter-enhancements
commit 772aed72378df9c8fccc5a4594b095d02d410a9c
Merge: 73ae431 801608f
Author: John Bowler <jbowler@acm.org>
Date: Mon Nov 16 14:26:38 2015 -0800
Merge branch 'libpng17' into libpng17-filter-enhancements
commit 73ae4316cb6db7d7f6756583a1c213c35ca4e3f4
Merge: 687e6e3 c09b3ab
Author: John Bowler <jbowler@acm.org>
Date: Sun Nov 15 09:31:30 2015 -0800
Merge branch 'libpng17' into libpng17-filter-enhancements
commit 687e6e393e9d0220c2a12ec474aa01b83c5e9f25
Merge: fedd6da e916d9b
Author: John Bowler <jbowler@acm.org>
Date: Thu Nov 5 08:45:14 2015 -0800
Merge branch 'libpng17' into libpng17-filter-enhancements
commit fedd6da8798a14b2e002b0bc1379f5a09a03598a
Merge: 2e2fc5f ea41fd2
Author: John Bowler <jbowler@acm.org>
Date: Tue Nov 3 21:05:01 2015 -0800
Merge branch 'libpng17' into libpng17-filter-enhancements
commit 2e2fc5f6d7678b710c52b7ea081ac4add677d8d5
Merge: 990d5f8 5b05197
Author: John Bowler <jbowler@acm.org>
Date: Mon Oct 12 08:28:30 2015 -0700
Merge branch 'libpng17' into libpng17-filter-enhancements
commit 990d5f88688635dc0888657b689e30ffe7e7a7b3
Author: John Bowler <jbowler@acm.org>
Date: Sun Oct 4 17:04:53 2015 -0700
Read row buffer changes
The read code now allocates one row buffer of the size of the input PNG row and,
only if required, one buffer of the size of the output.
The output buffer is required for the progressive reader (always) and for the
sequential reader if libpng is de-interlacing an image (because the output row
is used multiple times if png_read_row is called with a display row parameter.)
This should reduce memory utilization by libpng significantly, but it has no
detectable effect on overall performance figures of the test programs, these are
probably dominated by memory allocations for the whole image within the test
programs.
Signed-off-by: John Bowler <jbowler@acm.org>
commit 527bf989bf0e30440f9e07a5544a6ebb1d6fd039
Merge: 50ebbc2 9099254
Author: John Bowler <jbowler@acm.org>
Date: Sat Oct 3 13:39:17 2015 -0700
Merge branch 'libpng17' into libpng17-filter-enhancements
commit 50ebbc2c9a24cf1a6b428db53d55fbd5af4d6be6
Merge: 21a7f40 2cd6d56
Author: John Bowler <jbowler@acm.org>
Date: Sat Oct 3 11:16:32 2015 -0700
Merge branch 'libpng17' into libpng17-filter-enhancements
commit 21a7f401ab40c79ead9e35882a8066e2cf1d6902
Merge: b512e1c 15a143e
Author: John Bowler <jbowler@acm.org>
Date: Wed Sep 30 19:01:23 2015 -0700
Merge branch 'libpng17' into libpng17-filter-enhancements
commit b512e1c2c5bfe6df8b6dca32f862d325ec22115e
Author: John Bowler <jbowler@acm.org>
Date: Wed Sep 30 17:33:34 2015 -0700
Transform rewrite: perform transforms in small chunks
The intent of this change is to reduce the memory footprint during transform
sequences by performing transforms in fixed (small) sized blocks of pixels.
The change is incomplete; the filter code still works row-by-row, so the whole
tranform also works row-by-row, the intent is to fix this so that everything
works in small(ish) chunks.
At present the change has no discernable effect on pngvalid --speed or pngstest
with (e.g.) rgb-8-1.8.png; user time and (minor) page faults are the same in old
and new versions. The same applies to real-world 15MP PNG images; even on these
the presence of the filter code causes a cyclical progress through memory which
will interfere with any caching otherwise possible (useful word, 'otherwise'.)
Signed-off-by: John Bowler <jbowler@acm.org>
commit 781cb3699b92beb0e6bc5e03cef8fba820267082
Author: John Bowler <jbowler@acm.org>
Date: Wed Sep 30 17:12:53 2015 -0700
Fix NO_WRITE_INTERLACE in pngvalid.c
The support for writing interlaced images directly from libpng 1.7 was
unintentionally disabled (INTERLACE_LAST was defined incorrectly, excluding the
interlaced images). This obscured the fact that the transform and error test
case generators lacked the support for writing interlaced images from libpng.
Signed-off-by: John Bowler <jbowler@acm.org>
commit 406ee2fd7946a384f1d7713712dc646080c5c52c
Author: John Bowler <jbowler@acm.org>
Date: Wed Sep 30 17:11:40 2015 -0700
Add pngvalid --transform --interlace test
This increases code coverage by generating test cases with smaller length rows
as a result of the interlacing. Without this packswap handling was incompletely
tested.
Signed-off-by: John Bowler <jbowler@acm.org>
Signed-off-by: John Bowler <jbowler@acm.org>
This implements a new chunk parse implementation that can be shared, it
is currently shared by the progressive reader and the sequential one
(not, yet, the writer).
The patch also implements shared transform handling that is used
throughout.
Signed-off-by: John Bowler <jbowler@acm.org>
function has apparently never been used. It was implemented
to support back-door modification of png_struct in libpng-1.4.x
but (because it does nothing and cannot do anything) was apparently
never tested (John Bowler).
Added 'assert' based overflow checking for debug builds for char
and short assignments. Simply ignore the error in release builds
(a truncated value will be used without warning). Controlled by
PNG_RANGE_CHECK_SUPPORTED.
Added "option READ_iCCP enables READ_COMPRESSED_TEXT" to pnglibconf.dfa
Removed unused "text_len" parameter from private function png_write_zTXt().
Conditionally compile some code in png_deflate_claim(), when
PNG_WARNINGS_SUPPORTED and PNG_ERROR_TEXT_SUPPORTED are disabled.
Replaced repeated code in pngpread.c with PNG_PUSH_SAVE_BUFFER_IF_FULL.
Added "chunk iTXt enables TEXT" and "chunk zTXt enables TEXT"
to pnglibconf.dfa.
Edit and fix typos in comments.
png_push_read_chunk after recognizing the IDAT chunk, which avoids an
infinite loop while reading a datastream whose first IDAT chunk is of
zero-length.
fixed Cygwin+MSVC build errors. The ICC profile handling now includes more
checking. Several errors that caused rejection of the profile are now
handled with a warning in such a way that the invalid profiles will be
read by default in release (but not pre-RC) builds but will not be
written by default. The easy part of handling a cHRM chunk is written,
where the ICC profile contains the required data. The more difficult
part plus guessing a gAMA value requires code to pass selected RGB values
through the profile.
control of the unknown handling, corrects the pre-existing bug where
the per-chunk 'keep' setting is ignored and makes it possible to skip
IDAT chunks in the sequential reader (broken in earlier 1.6 versions).
There is a new test program, test-unknown.c, which is a work in progress
(not currently part of the test suite). Comments in the header files now
explain how the unknown handling works.
functions [rw]util.c. A new shared keyword check routine was also added
and the 'zbuf' is no longer allocated on progressive read. It is now
possible to call png_inflate() incrementally.
read code now claims and releases png_ptr->zstream, like the write code.
The bug whereby the progressive reader failed to release the zstream
is now fixed, all initialization is delayed, and the code checks for
changed parameters on deflate rather than always calling
deflatedEnd/deflateInit.
pngpread.c and use the sequential png_handle_tEXt, etc., in pngrutil.c;
now that png_ptr->buffer is inaccessible to applications, the special
handling is no longer useful.
Added new "png_structrp" typedef. Because of the
way libpng works both png_info and png_struct are always accessed via a
single pointer. This means adding C99 'restrict' to the pointer gives
the compiler some opportunity to optimize the code. This change allows that.
changes alter how the tricky allocation of the initial png_struct and png_info
structures are handled. png_info is now handled in pretty much the same
way as everything else, except that the allocations handle NULL return
silently. png_struct is changed in a similar way on allocation and on
deallocation a 'safety' error handler is put in place (which should never
be required). The error handler itself is changed to permit mismatches
in the application and libpng error buffer size; however, this means a
silent change to the API to return the jmp_buf if the size doesn't match
the size from the libpng compilation; libpng now allocates the memory and
this may fail. Overall these changes result in slight code size
reductions; however, this is a reduction in code that is always executed
so is particularly valuable. Overall on a 64-bit system the libpng DLL
decreases in code size by 1733 bytes. pngerror.o increases in size by
about 465 bytes because of the new functionality.
handling. Internal changes only except for a new option to avoid compiling
in the png_build_grayscale_palette API (which is not used at all internally.)
The main change is to move the transform tests (READ_TRANSFORMS,
WRITE_TRANSFORMS) up one level to the caller of the APIs.
