8 Commits

Author	SHA1	Message	Date
skal	b65727b55d	Premultiply with alpha during U/V downsampling ... This prevents the 'alpha-leak' reported in issue #220 Speed-diff is kept minimal. (cherry picked from commit c792d4129a) Change-Id: I1976de5e6de7cfcec89a54df9233c1a6586a5846	2014-10-14 12:02:16 +02:00
skal	ee78e7801d	SmartRGBYUV: fix odd-width problem with pixel replication ... rightmost pixel was missing a copy, which could lead to invalid read. Also added a lower dimension of 4, below which we use the regular conversion. This is to prevent corner cases, in addition to not being overkill. (cherry picked from commit 2523aa73cb) Change-Id: Iac12e7a3d74590f12fe8eeb1830b9891e61439f6	2014-10-13 19:03:48 +02:00
Pascal Massimino	c9ac2041e9	fix some MSVC64 warning about float conversion ... (cherry picked from commit ee52dc4e54) Change-Id: I27ab27fc15033d27d0505729f6275fb542c8d473	2014-10-13 19:03:48 +02:00
skal	e2159fdff7	faster RGB->YUV conversion function (~7% speedup) ... with a special case for dithering==0., it gets somewhat faster on x86 thanks to inlining. Also, less macros. (cherry picked from commit e2a83d7109) Change-Id: Ic2f2bf6718310743bb40cef2104fa759a073e6d5	2014-10-13 19:03:48 +02:00
skal	21abaa05e3	Add smart RGB->YUV conversion option -pre 4 ... New function: WebPPictureSmartARGBToYUVA() This implement smart RGB->YUV conversion. This is rather undocumented for now, and is triggered using '-pre 4' preprocessing option. This is slow-ish and use quite some memory, but should be improvable. This is somehow a usable beta version. (cherry picked from commit 3fc4c539aa) Change-Id: Ia50a8c30134e4cab8a7d3eb70aef13ce1f6187a1	2014-10-13 19:03:48 +02:00
Vikas Arora	d2cc61b7dd	Extend MakeARGB32() to accept Alpha channel. ... Change-Id: I31b8e2d085000e2e3687a373401e4f655f11fc42	2014-07-21 14:49:38 -07:00
Pascal Massimino	1549d62067	reorder the YUVA->ARGB and ARGB->YUVA functions correctly ... + rework few loops + consolidate few error-checks / error-reporting + don't modify picture->colorspace in Import() for ARGB output Change-Id: Iae6da9b50acc738c59b85c3ee64efbaf6af8bffc	2014-07-18 07:15:54 -07:00
Pascal Massimino	736f2a175e	extract colorspace code from picture.c into picture_csp.c ... had to refactor few functions here and there. Change-Id: I86fde6fec7c2fc7eb48f0ecf327dbbd2bd40b9d4	2014-07-16 16:37:26 -07:00