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Reasons for the removal include: - This functionality was always somewhat experimental and has never been enabled by default, partly because of worries about rendering bugs caused by e.g. bad/outdated graphics drivers. - After the initial implementation, in PR 4286 (back in 2014), no additional functionality has been added to the WebGL implementation. - The vast majority of all documents do not benefit from WebGL rendering, since only a couple of *specific* features are supported (e.g. some Soft Masks and Patterns). - There is, and has always been, *zero* test-coverage for the WebGL implementation. - Overall performance, in the PDF.js library, has improved since the experimental WebGL implementation was added. Rather than shipping unused *and* untested code, it seems reasonable to simply remove the WebGL implementation for now; thanks to version control it's always possible to bring back the code should the need ever arise. |
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