<AWT Dev> [8] Review request for 8011059 [macosx] Make JDK demos look perfect on retina displays

[Alexander Scherbatiy]

  Could you review the updated fix:
     http://cr.openjdk.java.net/~alexsch/8011059/webrev.06/

   Only internal API is exposed:
   - MultiResolutionImage interface with method 
"getResolutionVariant(int width, int height)" is added to the 
com.sun.awt package
   - Hints to switch on/off the resolution variant usage are added to 
SunHints class
   - Test is updated to use the  MultiResolutionImage interface

  Thanks,
  Alexandr.

On 11/5/2013 3:16 PM, Alexander Scherbatiy wrote:
>
>    Thank you for the review.
>
>   Could you look at the updated fix:
>      http://cr.openjdk.java.net/~alexsch/8011059/webrev.05/
>
>   - URL is parsed to protocol, host, port, and path parts in the 
> LWCToolkit class.
>      I checked that URL(protocol, host, port, file) constructor 
> correctly handles -1 port value.
>   - Only last file name after last '/' in the URL path  is converted 
> to @2x name
>   - Tests that check correct URL and path translation to @2x names are 
> added to the ScalableImageTest
>
>   Thanks,
>   Alexandr.
>
>
> On 11/1/2013 12:46 AM, Peter Levart wrote:
>>
>> On 10/29/2013 05:45 PM, Alexander Scherbatiy wrote:
>>>> 2. I'm not sure that the proposed getScaledImageName() 
>>>> implementation in ScalableToolkitImage works perfectly for URLs 
>>>> like this:
>>>>
>>>> http://www.exampmle.com/dir/image
>>>>
>>>> In this case it will try to find 2x image here:
>>>>
>>>> http://www.example@2x.com/dir/image
>>>>
>>>> which doesn't look correct.
>>>        Fixed. Only path part of a URL is converted to path2x. 
>>
>> Hi Alexander,
>>
>> URLs like this:
>>
>> http://www.example.com/dir.ext/image
>>
>> will still be translated to:
>>
>> http://www.example.com/dir@2x.ext/image
>>
>>
>> I think you need to search for last '.' after the last  '/' in the 
>> getScaledImageName();
>>
>>
>> Also the following code has some additional bugs:
>>
>>   853         static Image toScalableImage(Image image, URL url) {
>>   854
>>   855             if (url != null && !url.toString().contains("@2x")
>>   856                     && !(image instanceof ScalableToolkitImage)) {
>>   857                 String protocol = url.getProtocol();
>>   858                 String host = url.getHost();
>>   859                 String file = url.getPath();
>>   860                 String file2x =*host +*getScaledImageName(file);
>>   861                 try {
>>   862                     URL url2x = new URL(protocol, host, file2x);
>>   863                     url2x.openStream();
>>   864                     return new ScalableToolkitImage(image, 
>> getDefaultToolkit().getImage(url2x));
>>   865                 } catch (Exception ignore) {
>>   866                 }
>>   867             }
>>   868             return image;
>>   869         }
>>
>> Why are you prepending *host* to getScaledImageName(file) in line 
>> 860? Let's take the following URL for example:
>>
>> http://www.example.com/dir/image.jpg
>>
>> protocol = "http"
>> host = "www.example.com"
>> file = "/dir/image.jpg"
>> file2x = "*www.example.com*/dir/image at 2x.jpg"
>> url2x = URL("http://www.example.com*www.example.com*/dir/image@2x.jpg")
>>
>>
>> You are missing a part in URL (de)construction - the optional port! 
>> For example in the following URL:
>>
>> http://www.example.com:8080/dir/image.jpg
>>
>> You should extract the port from original URL and use it in new URL 
>> construction if present (!= -1).
>>
>>
>> I would also close the stream explicitly after probing for existence 
>> of resource rather than delegating to GC which might not be promptly 
>> and can cause resource exhaustion (think of MAX. # of open file 
>> descriptors):
>>
>>         try (InputStream probe = url.openStream()) {}
>>
>>
>>
>> Regards, Peter
>>
>>
>