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webgl: Refactor texture validations to take advantage of rust type system <!-- Please describe your changes on the following line: --> --- <!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: --> - [x] `./mach build -d` does not report any errors - [x] `./mach test-tidy` does not report any errors <!-- Either: --> - [x] These changes do not require tests because refactoring. <!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. --> This commit introduces the `WebGLValidator` trait, and uses it for multiple validations in the texture-related WebGL code, to move that logic out of the already bloated `webglrenderingcontext.rs` file. It also creates a type-safe wrapper for some WebGL types, removing all the `unreachable!`s there, and introduces a macro for generating them conveniently. This partially addresses #10693, pending refactor more code to use this infrastructure, and (possibly?) introducing an `AsGLError` trait for the errors to make the error handling happen in `WebGLContext`. r? @jdm <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11724) <!-- Reviewable:end --> |
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