[OpenJDK 2D-Dev] RFR: 8012229: [lcms] Improve performance of color conversion for images with alpha channel
Sergey Bylokhov
serb at openjdk.java.net
Mon Mar 29 23:02:08 UTC 2021
The lcms 2.8 version added support for the cmsFLAGS_COPY_ALPHA flag:
https://sourceforge.net/p/lcms/mailman/lcms-user/thread/001c01d1c0f3%2484a7cb30%248df76190%24%40ProDigitalSoftware.com/#msg35143398
which supports alpha channel transportation
For our usage, it means we can use TYPE_4BYTE_ABGR and TYPE_INT_ARGB directly as a source and destination.
Some numbers; converting new BufferedImage(3000, 3000, TYPE_INT_ARGB) from CS_sRGB to CS_CIEXYZ via op.filter(src, dst):
//before the fix
//Benchmark Mode Cnt Score Error Units
//ColorAlphaConv.testFilter avgt 5 603,392 ± 12,932 ms/op
//after the fix
//Benchmark Mode Cnt Score Error Units
//ColorAlphaConv.testFilter avgt 5 121,624 ± 0,906 ms/op
But still slower than kcms
//kcms jdk8u60
//Benchmark Mode Cnt Score Error Units
//ColorAlphaConv.testFilter avgt 5 13,256 ± 0,169 ms/op
-------------
Commit messages:
- Initial fix
Changes: https://git.openjdk.java.net/jdk/pull/3239/files
Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3239&range=00
Issue: https://bugs.openjdk.java.net/browse/JDK-8012229
Stats: 208 lines in 5 files changed: 195 ins; 2 del; 11 mod
Patch: https://git.openjdk.java.net/jdk/pull/3239.diff
Fetch: git fetch https://git.openjdk.java.net/jdk pull/3239/head:pull/3239
PR: https://git.openjdk.java.net/jdk/pull/3239
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