Right, but when those differences come to light, should the goal be to adjust 
the ref test to make it platform-independent, or is having platform-specific 
ref tests acceptable?  Doesn't that put us in the same situation as having 
platform-specific pixel tests?

From: Ryosuke Niwa <[email protected]<mailto:[email protected]>>
Date: Thu, 12 Apr 2012 13:43:26 -0700
To: Jacob Goldstein <[email protected]<mailto:[email protected]>>
Cc: Ojan Vafai <[email protected]<mailto:[email protected]>>, Dirk Pranke 
<[email protected]<mailto:[email protected]>>, WebKit Development 
<[email protected]<mailto:[email protected]>>
Subject: Re: [webkit-dev] Handling failing reftests

Right but you wouldn't know platform-specific issues until you land them. e.g. 
rounding errors, subtle font differences in edge cases, etc...

On Thu, Apr 12, 2012 at 1:30 PM, Jacob Goldstein 
<[email protected]<mailto:[email protected]>> wrote:
Isn't the goal of writing a ref test that it is not platform specific?

From: Ryosuke Niwa <[email protected]<mailto:[email protected]>>
Date: Thu, 12 Apr 2012 12:29:42 -0700
To: Ojan Vafai <[email protected]<mailto:[email protected]>>
Cc: Dirk Pranke <[email protected]<mailto:[email protected]>>, WebKit 
Development <[email protected]<mailto:[email protected]>>
Subject: Re: [webkit-dev] Handling failing reftests

On Thu, Apr 12, 2012 at 11:53 AM, Ojan Vafai 
<[email protected]<mailto:[email protected]>> wrote:
I agree that it's hard sometimes to construct reftests that work, but once 
you've done so, the cost on the project of maintaining the test is usually 
considerably lower than pixel tests.

Not so sure. There are cases where we have these platform specific failures for 
ref tests, and they're much harder to fix than rebaselining pixel results.

- Ryosuke


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