Autodesk: HdxOitResolveTask - fix screen size computation

[erikaharrison-adsk]

Description of Change(s)

Bug fix: Have a generic way to get the screen size but keeps OpenGL code for backward compatibility with legacy code.

The screen size computation in the HdxOitResolveTask is based on some OpenGL code when the aovs are not accessible. That's problematic for cases not running with OpenGL (e.g., macOs with Metal). The change consists to add the screen size to the HdxOitResolveTaskParams structure so, the computation is not anymore needed.

Note: The original design flaw remains as it computes the render buffer size and not the screen size. In some cases it could be different. For backward compatibility the computation still returns the render buffer size and uses it as screen size.

Link to proposal (if applicable)

• N/A

Fixes Issue(s)

• N/A

Checklist

• I have created this PR based on the dev branch

• I have followed the coding conventions

• I have added unit tests that exercise this functionality (Reference:
  testing guidelines)

• I have verified that all unit tests pass with the proposed changes

• I have submitted a signed Contributor License Agreement (Reference:
  Contributor License Agreement instructions)

[jesschimein]

Filed as internal issue #USD-10632

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[jesschimein]

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