this internalizes the init checks and provides stronger synchronization
with pthreads when available while still allowing VP8GetCPUInfo to be
modified (mostly for testing purposes). windows is left as is since a
critical section or mutex would cause a leak.
Change-Id: Ieb997e014f2805c0ae39c16f13337663521356f4
Control Flow Integrity [1] indirect call checking verifies that function
pointers only call valid functions with a matching type signature. This
change eliminates function pointer casts that were causing cfi-icall
failures.
[1] https://www.chromium.org/developers/testing/control-flow-integrity
BUG=chromium:827826
Change-Id: I5db021d06390a6cefd670fdd2f0d34c9e530465e
this is consistent with web browser behavior as well as various
transcoding tools (ffmpeg, gif2apng, etc).
also: update anim_diff to account for this new behaviour.
BUG=webp:379
Change-Id: I70cc72a6b401ef32b73cd182a3f12d993d495bf4
Output is <.1% difference in size, randomly.
Speed is 30-50% faster (-m 0 -sharp_yuv).
It also gives the exact same output on ARM and x86, because floats
are no longer used.
Change-Id: Id0f0aa748cc4fc0b82bac1fc5ca954775a0a1b7c
this quiets a -Wclobbered warning on const has_alpha under gcc-7 and
brings the variables closer to their first use.
Change-Id: I8a24f275b7ff34a94d47b576bcf276dbedac2121
do_copy is a loop invariant, but based on a variable parameter; it would
only be extracted if Import was inlined.
Change-Id: Id5b4a1a4a83a4f2083444da4934e4c994df65b44
Apply gamma correction to the decoded RGB values.
This handles corner cases where the PNG file doesn't have
a standard 1/2.2 gamma value.
BUG=webp:369
Change-Id: I9907b6e2c458002de7c26d0b9e416278cca33990
for q<=98, we always enable error diffusion.
+ reduce storage 2x by using int8_t
+ make the error diffusion more robust
BUG=webp:340,308
Change-Id: I0608df839ff7b64d6843005a0f81d2577143af9e
* regarding alpha_data_ used for testing.
alpha_data_!=NULL is as close a good test as we'll get.
* regarding filter-strength / sharpness forcing
no practical use (can be done during encode cycles,
for experimentation)
* regarding a 'less-complex' filtering:
no practical use so far. Next version!
Change-Id: If2dfff5818552a7d3e7c23ac08d64fe6d270229c
For large images overflowing the partition0, we re-do a number
of passes but were forgetting to reset the block_count[].
This was leading to incorrect summary.
+ some cosmetic fixes here and there
BUG=webp:355
Change-Id: Ie87158d7f177f8efdca429b146cfcd0e81652d2f
