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Kumataro
6c374bebee
imgcodecs(webp): improve IMWRITE_WEBP_LOSSLESS_MODE to support exact lossless compression #28519 Close #28503 Add IMWRITE_WEBP_LOSSLESS_MODE enum to control lossless strategy: - IMWRITE_WEBP_LOSSLESS_OFF: Lossy compression. - IMWRITE_WEBP_LOSSLESS_ON: Optimize/drop color in transparent pixels. - IMWRITE_WEBP_LOSSLESS_PRESERVE_COLOR: Preserve color in transparent pixels. Note: Currently limited to still images; animated WebP support is deferred per YAGNI. ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [x] There is a reference to the original bug report and related work - [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [x] The feature is well documented and sample code can be built with the project CMake