use createUninitialized when creating TypedArray from another array
https://bugs.webkit.org/show_bug.cgi?id=92518
Patch by Arnaud Renevier <a.renevier@sisa.samsung.com> on 2012-07-27
Reviewed by Kenneth Russell.
PerformanceTests:
* Bindings/typed-array-construct-from-array.html: Added.
Source/WebCore:
When creating a Typed Array from another array, we fill it with values
from the source array. So, we can create it uninitialized. This is
make constructor about 35% faster when constructed with another typed
array.
Test: fast/canvas/webgl/array-constructor.html
* bindings/js/JSArrayBufferViewHelper.h:
(WebCore::constructArrayBufferViewWithTypedArrayArgument):
(WebCore::constructArrayBufferView):
Source/WTF:
Expose a createUninitialized static method on TypedArray classes.
* wtf/Float32Array.h:
(Float32Array):
(WTF::Float32Array::createUninitialized):
(WTF):
* wtf/Float64Array.h:
(Float64Array):
(WTF::Float64Array::createUninitialized):
(WTF):
* wtf/Int16Array.h:
(Int16Array):
(WTF::Int16Array::createUninitialized):
(WTF):
* wtf/Int32Array.h:
(Int32Array):
(WTF::Int32Array::createUninitialized):
(WTF):
* wtf/Int8Array.h:
(Int8Array):
(WTF::Int8Array::createUninitialized):
(WTF):
* wtf/Uint16Array.h:
(Uint16Array):
(WTF::Uint16Array::createUninitialized):
(WTF):
* wtf/Uint32Array.h:
(Uint32Array):
(WTF::Uint32Array::createUninitialized):
(WTF):
* wtf/Uint8Array.h:
(Uint8Array):
(WTF::Uint8Array::createUninitialized):
(WTF):
* wtf/Uint8ClampedArray.h:
(Uint8ClampedArray):
LayoutTests:
Add test to check that constructing a Typed Array with nan values does
not result in random values.
* fast/canvas/webgl/array-constructor-expected.txt: Added.
* fast/canvas/webgl/array-constructor.html: Added.
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@123935 268f45cc-cd09-0410-ab3c-d52691b4dbfc
17 files changed
