libwebp

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Commit Graph

Author	SHA1	Message	Date
Vincent Rabaud	e14ad93c0a	Make sure we reach the full range for alpha blending. 255255257>>16 == 254 while we want 255. BUG=webp:360 Change-Id: I2b9ac18f8802145f5a3d500c149ad9eceacbd75b	2017-10-05 16:53:57 +02:00
hui su	7d67a1646d	Lossy encoding: smoothen transparent areas to improve compression If "exact" is false, we can modify the luma samples in fully transparent areas to facilitate lossy compression. Experiments on some PNG images show compression improvement of more than 20%. Change-Id: I1a728cfa920a6652bc1f600d87c01f7f648c4942	2017-07-05 10:03:01 -07:00
James Zern	668e1dd44f	src/{dec,enc,utils}: give filenames a unique suffix this avoids duplicates between these trees and dsp/, e.g., enc/tree.c, dec/tree.c, making pulling the whole library source tree into one target possible BUG=webp:279 Change-Id: I060a614833c7c24ddd37bf641702ae6a5eef1775	2017-01-19 19:09:48 -08:00

Author

SHA1

Message

Date

Vincent Rabaud

e14ad93c0a

Make sure we reach the full range for alpha blending.

255*255*257>>16 == 254 while we want 255.

BUG=webp:360

Change-Id: I2b9ac18f8802145f5a3d500c149ad9eceacbd75b

2017-10-05 16:53:57 +02:00

hui su

7d67a1646d

Lossy encoding: smoothen transparent areas to improve compression

If "exact" is false, we can modify the luma samples in fully transparent
areas to facilitate lossy compression. Experiments on some PNG images
show compression improvement of more than 20%.

Change-Id: I1a728cfa920a6652bc1f600d87c01f7f648c4942

2017-07-05 10:03:01 -07:00

James Zern

668e1dd44f

src/{dec,enc,utils}: give filenames a unique suffix

this avoids duplicates between these trees and dsp/, e.g., enc/tree.c,
dec/tree.c, making pulling the whole library source tree into one target
possible

BUG=webp:279

Change-Id: I060a614833c7c24ddd37bf641702ae6a5eef1775

2017-01-19 19:09:48 -08:00

3 Commits