Bug 23123 – CanvasPixelArray performance is too slow

• Component: DOM
• Status: CLOSED FIXED

[Oliver Hunt]

CPA perf is too slow, esp. when compared to pure array

[Oliver Hunt]

Created attachment 26444 [details]
Devirtualise byte array logic

devirtualisation-fu

[Oliver Hunt]

Created attachment 26445 [details]
Fixed issues pointed out by mark

Minor updates

[Gavin Barraclough]

Comment on attachment 26445 [details]
Fixed issues pointed out by mark

If bdash is happy with the style, then I'm happy with the logic.

[Oliver Hunt]

Committing to http://svn.webkit.org/repository/webkit/trunk ...
	C	WebCore/bindings/js/JSImageDataCustom.cpp => JavaScriptCore/runtime/ByteArray.h
	R	WebCore/bindings/js/JSCanvasPixelArrayCustom.h => JavaScriptCore/runtime/ByteArray.cpp
	D	WebCore/html/CanvasPixelArray.cpp
	D	WebCore/html/CanvasPixelArray.h
	D	WebCore/html/CanvasPixelArray.idl
	M	JavaScriptCore/ChangeLog
	M	JavaScriptCore/GNUmakefile.am
	M	JavaScriptCore/JavaScriptCore.exp
	M	JavaScriptCore/JavaScriptCore.pri
	M	JavaScriptCore/JavaScriptCore.scons
	M	JavaScriptCore/JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.vcproj
	M	JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
	M	JavaScriptCore/interpreter/Interpreter.cpp
	M	JavaScriptCore/interpreter/Interpreter.h
	A	JavaScriptCore/runtime/JSByteArray.cpp
	A	JavaScriptCore/runtime/JSByteArray.h
	M	WebCore/ChangeLog
	M	WebCore/DerivedSources.make
	A	WebCore/ForwardingHeaders/runtime/ByteArray.h
	A	WebCore/ForwardingHeaders/runtime/JSByteArray.h
	M	WebCore/GNUmakefile.am
	M	WebCore/WebCore.pro
	M	WebCore/WebCore.scons
	M	WebCore/WebCore.vcproj/WebCore.vcproj
	M	WebCore/WebCore.xcodeproj/project.pbxproj
	M	WebCore/WebCoreSources.bkl
	M	WebCore/bindings/js/JSImageDataCustom.cpp
	M	WebCore/html/CanvasRenderingContext2D.cpp
	M	WebCore/html/ImageData.cpp
	M	WebCore/html/ImageData.h
	M	WebCore/html/ImageData.idl
	M	WebCore/platform/graphics/cg/ImageBufferCG.cpp
Committed r39625

[Dean McNamee]

Is it appropriate for WebCore to be using this JSC runtime/ class?  I don't know the rules, but this moved from using a WebCore type (CanvasPixelArray), to the new ByteArray JSC class.  It seems like it would be preferred to have the type in WebCore...

Thanks

[Oliver Hunt]

This is necessary to achieve acceptable performance, pulling bytearray into webcore would result in a cyclic dependency.

(In reply to comment #5)
> Is it appropriate for WebCore to be using this JSC runtime/ class?  I don't
> know the rules, but this moved from using a WebCore type (CanvasPixelArray), to
> the new ByteArray JSC class.  It seems like it would be preferred to have the
> type in WebCore...
> 
> Thanks
> 

[Oliver Hunt]

It may be possible to pull bytearray into WTF actually, which seems betterer