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mtklein 8a90edc2a5 Sk4px: alphas() and Load[24]Alphas()
alphas() extracts the 4 alphas from an existing Sk4px as another Sk4px.
LoadNAlphas() constructs an Sk4px from N packed alphas.

In both cases, we end up with 4x repeated alphas aligned with their pixels.

alphas()
  A0 R0 G0 B0  A1 R1 G1 B1  A2 R2 G2 B2  A3 R3 G3 B3
  ->
  A0 A0 A0 A0  A1 A1 A1 A1  A2 A2 A2 A2  A3 A3 A3 A3

Load4Alphas()
  A0 A1 A2 A3
  ->
  A0 A0 A0 A0  A1 A1 A1 A1  A2 A2 A2 A2  A3 A3 A3 A3

Load2Alphas()
  A0 A1
  ->
  A0 A0 A0 A0  A1 A1 A1 A1  0 0 0 0  0 0 0 0

This is a 5-10% speedup for AA on Intel, and wash on ARM.
AA is still mostly dominated by the final lerp.

alphas() isn't used yet, but it's similar enough to Load[24]Alphas()
that it was easier to write all at once.

BUG=skia:

Review URL: https://codereview.chromium.org/1138333003
2015-05-13 12:19:42 -07:00
animations first cut at a checkbox 2009-10-21 19:41:10 +00:00
bench Add _aa variants of Xfermode benches. 2015-05-13 11:54:00 -07:00
bin sync-and-gyp script: fix to work in MSYS shell 2015-04-24 14:33:06 -07:00
debugger Get debugger compiling again 2015-05-04 10:42:05 -07:00
dm DM: use SkFunction to make required argument type clearer. 2015-05-07 10:53:34 -07:00
example C++11 override should now be supported by all of {bots,Chrome,Android,Mozilla} 2015-03-25 18:17:32 -07:00
experimental Revert of Revert of stop calling SkScalarDiv (patchset #1 id:1 of https://codereview.chromium.org/1138263002/) 2015-05-12 10:37:34 -07:00
forth Sanitizing source files in Skia_Periodic_House_Keeping 2013-01-26 07:06:02 +00:00
gm Revert of Font variations. (patchset #21 id:400001 of https://codereview.chromium.org/1027373002/) 2015-05-13 12:16:41 -07:00
gyp Revert of Font variations. (patchset #21 id:400001 of https://codereview.chromium.org/1027373002/) 2015-05-13 12:16:41 -07:00
include Revert of Font variations. (patchset #21 id:400001 of https://codereview.chromium.org/1027373002/) 2015-05-13 12:16:41 -07:00
platform_tools Add android_launch_app script to allow command line options to be passed to the sampleApp when starting. 2015-05-11 08:54:19 -04:00
resources Revert of Font variations. (patchset #21 id:400001 of https://codereview.chromium.org/1027373002/) 2015-05-13 12:16:41 -07:00
samplecode Revert of Revert of stop calling SkScalarDiv (patchset #1 id:1 of https://codereview.chromium.org/1138263002/) 2015-05-12 10:37:34 -07:00
site Remove documentation for missing SkiaExamples. 2015-05-13 06:45:43 -07:00
src Sk4px: alphas() and Load[24]Alphas() 2015-05-13 12:19:42 -07:00
tests Revert of Font variations. (patchset #21 id:400001 of https://codereview.chromium.org/1027373002/) 2015-05-13 12:16:41 -07:00
third_party Enable both static and dynamically linked libpng 2015-04-03 12:35:27 -07:00
tools deal more consistently with unsortable edges 2015-05-13 08:23:48 -07:00
.gitignore git: add skps to .gitignore 2015-02-13 18:57:33 -08:00
AUTHORS Return cropBitmap 2015-04-15 05:48:54 -07:00
codereview.settings Automatically add a docs preview link and NOTRY=true when there are only docs changes. 2015-02-26 10:16:13 -08:00
CONTRIBUTING Fix references to https://sites.google.com/site/skiadocs/. 2015-02-03 13:12:54 -02:00
CQ_COMMITTERS add new Skia team member to committers list 2015-02-03 11:10:57 -08:00
DEPS Update our libjpeg to the version used by Chromium. 2015-04-20 06:58:49 -07:00
Doxyfile C++11 override should now be supported by all of {bots,Chrome,Android,Mozilla} 2015-03-25 18:17:32 -07:00
gyp_skia Support SKIA_OUT on Mac and ChromeOS 2015-05-04 08:04:28 -07:00
gyp_skia.py Roll gyp deps from 1765 to 1796. 2013-11-21 18:11:14 +00:00
HASHTAGS Fix cr SKPs naming 2015-03-31 08:03:02 -07:00
LICENSE Manually update copyright notices in files that defied the automated process 2011-07-28 14:24:55 +00:00
make.bat Fix references to https://sites.google.com/site/skiadocs/. 2015-02-03 13:12:54 -02:00
make.py Run gyp on Win with --no-parallel -G config=$(BUILDTYPE), fix pylint 2015-03-03 13:15:38 -05:00
Makefile Run gyp with --no-parallel -G config=$(BUILDTYPE) 2015-03-03 06:05:56 -08:00
OWNERS add root files from chrome 2013-08-13 19:11:15 +00:00
PRESUBMIT.py Add presubmit to run {dm,nanobench}_flags.py test when changed. 2015-05-05 10:28:44 -07:00
README Fix references to https://sites.google.com/site/skiadocs/. 2015-02-03 13:12:54 -02:00
README.chromium add root files from chrome 2013-08-13 19:11:15 +00:00
skia.gyp Fix references to https://sites.google.com/site/skiadocs/. 2015-02-03 13:12:54 -02:00
SKP_VERSION Update SKP version 2015-05-10 01:14:36 -07:00
whitespace.txt whitespace change (testing flaky bots) 2015-05-08 11:39:26 -07:00

Skia is a complete 2D graphic library for drawing Text, Geometries, and Images.

See full details, and build instructions, at https://skia.org.