RFR: 8300929: Avoid unnecessary array fill after creation in java.awt.image

[Andrey Turbanov]

On Tue, 24 Jan 2023 16:22:43 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

>> No need to fill elements of array with default values if it was just created. Java guarantees that all elements of numeric array have default values after allocations - 0.
>
> src/java.desktop/share/classes/java/awt/image/ComponentColorModel.java line 521:
> 
>> 519:             {
>> 520:                 byte[] bpixel = new byte[numComponents];
>> 521:                 for (int i = 0; i < numColorComponents; i++) {
> 
> Is it possible that indirectly this code threw the AIOBE for some wrong "numColorComponents"?

I believe it's impossible to get AIOBE here (at least without some reflection tricks).
`numColorComponents` and `numComponents` are assigned only in 2 places. And in both places it's guarantee that `numComponents >= numColorComponents`
![изображение](https://user-images.githubusercontent.com/741251/214376362-881adb6b-7ea9-4fd3-8787-d52626fb7489.png)

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PR: https://git.openjdk.org/jdk/pull/12147