<AWT Dev> RFR: 8182043: Access to Windows Large Icons [v3]

[Alexander Zuev]

On Fri, 30 Apr 2021 20:54:01 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>> src/java.desktop/windows/classes/sun/awt/shell/Win32ShellFolder2.java line 1146:
>> 
>>> 1144:             }
>>> 1145:             Map<Integer, Image> multiResolutionIcon = new HashMap<>();
>>> 1146:             int start = size > MAX_QUALITY_ICON ? ICON_RESOLUTIONS.length - 1 : 0;
>> 
>> Does it make sense to always start at zero?
>> The icons of smaller size will never be used, will they?
>> Thus it's safe to start at the index which corresponds to the requested size if `size` matches, or the index such as `ICON_RESOLUTIONS[index] < size && ICON_RESOLUTIONS[index + 1] > size`.
>
> This comment is also about the case of not fetching icons of sizes smaller than requested size.

Sorry, missed that in my latest fix. Indeed there is no legitimate ways to set scaling factor to less than 100% on Windows so yes, omitting the icons that are less than expected size. As for starting the count from the correct index - to get the correct index we would have to traverse the array of possible resolutions anyways so there is no performance gain.

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PR: https://git.openjdk.java.net/jdk/pull/2875