no precision loss observed
speed is not really faster (0.5% at max), as forward-WHT isn't called often.
also: replaced a "int << 3" (undefined by C-spec) by a "int * 8"
( supersedes https://gerrit.chromium.org/gerrit/#/c/48739/ )
Change-Id: I2d980ec2f20f4ff6be5636105ff4f1c70ffde401
it's not often the case, but could happen, that chroma has non-zero
coeff but luma hasn't. In such case, we should skip luma right away
Change-Id: I9515573ffaec8aad8b069d2c02ffbda4a6eff97c
Removed a call to WebPParseHeaders() inside VP8GetHeaders(). This was not needed
anyway, as all call flows already call WebPParseHeaders() before calling
VP8GetHeaders().
This avoids duplicate calls to WebPParseHeaders().
Change-Id: Icb2d618bd26c44220d956c17a69c9c45a62d5237
The output surface CAN be changed inbetween calls to
WebPIUpdate() or WebPIAppend(), but with precautions.
Change-Id: I899afbd95738a6a8e0e7000f8daef3e74c99ddd8
This applies to images with optional chunks (e.g. images with ALPH
chunk,
ICCP chunk etc). Before this, the incremental decoding used to work like
non-incremental decoding for such files, that is, no rows were decoded
until
all data was available.
The change is in 2 parts:
- During optional chunk parsing, don't wait for the full VP8/VP8L chunk.
- Remap 'alpha_data' pointer whenever a new buffer is allocated/used in
WebPIAppend() and WebPIUpdate().
Change-Id: I6cfd6ca1f334b9c6610fcbf662cd85fa494f2a91
- drop some unnecessary link flags
- use lib.exe directly for creating libraries
- factorize /nologo and use it consistently
Change-Id: Ie76119bc051e9bc53e4d6bba1a0a3f124f9062fc
breaks under wine; from MSDN:
/FD is only used by the development environment, and it should not be
used from the command line or a build script.
Change-Id: I180c9813e721b163cc645b9b7f14fe36556019d3
new option: -blend_alpha 0xrrggbb
also: don't force picture.use_argb value for lossless. Instead,
delay the YUVA<->ARGB conversion till WebPEncode() is called.
This make the blending more accurate when source is ARGB
and lossy compression is used (YUVA).
This has an effect on cropping/rescaling. E.g. for PNG, these
are now done in ARGB colorspace instead of YUV when lossy compression
is used.
Change-Id: I18571f1b1179881737a8dbd23ad0aa8cddae3c6b
* 0.3.0: (65 commits)
Update ChangeLog
Cosmetic fixes
misc style fix
add missing YUVA->ARGB automatic conversion in WebPEncode()
Container spec: Clarify frame disposal
container doc: add a note about the 'ANMF' payload
Container spec: clarify the background color field
container doc: move RIFF description to own section
libwebp/mux: fix double free
use WebPDataCopy() instead of re-coding it.
demux: keep a frame tail pointer; used in AddFrame
add doc precision about WebPParseHeaders() return codes
gif2webp: Bgcolor fix for a special case
fix bad saturation order in QuantizeBlock
vwebp/animation: fix background dispose
Makefile.vc: fix dynamic builds
update ChangeLog
examples: don't use C99 %zu
update ChangeLog
update NEWS
...
Conflicts:
src/webp/format_constants.h
Change-Id: Ie659644d3ea5592cde64ec3af90a00cd17838247
user can now call WebPEncode() with any YUVA or ARGB format, for
lossy or lossless compression
also: simplified error reporting, which is done in WebPPictureARGBToYUVA()
and WebPPictureYUVAToARGB()
Change-Id: Ifb68909217175bcf5a050e5c68d06de9849468f7
(cherry picked from commit 07d87bda1b)
- Add a note that disposal only applies to the frame rectangle
- Add the formula for alpha-blending.
- Note that alpha-blending would occur for the common rectangle
- Also note the case when both color profile and disposal are
present.
Change-Id: I214787dd64453edf3b0cdaff3951015281a32ee4
user can now call WebPEncode() with any YUVA or ARGB format, for
lossy or lossless compression
also: simplified error reporting, which is done in WebPPictureARGBToYUVA()
and WebPPictureYUVAToARGB()
Change-Id: Ifb68909217175bcf5a050e5c68d06de9849468f7
