src: refactor and apply fixes #2229
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- Defer the initialization of the `op` variable to the `default` switch case to avoid a compiler warning. - Use a `default` switch case with a null statement if some enum values aren't suppsed to be handled, this avoids a compiler warning. - Migrate from librsvg's deprecated `rsvg_handle_get_dimensions()` and `rsvg_handle_render_cairo()` functions to the new `rsvg_handle_get_intrinsic_size_in_pixels()` and `rsvg_handle_render_document()` respectively. - Avoid calling virtual methods in constructors/destructors to avoid bypassing virtual dispatch. - Remove unused private field `backend` in the `Backend` class. - Fix a case of use-after-free. - Fix usage of garbage value by filling the allocated memory entirely with zeros if it's not modified. - Fix a potential memory leak.
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zbjornson
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Added in #2229, this is a C++20 feature. For now we're on C++17 (by way of Node.js v18).
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#2229 switched to new librsvg APIs only available in 2.52.0.
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#2229 switched to new librsvg APIs only available in 2.52.0.
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