cudacodec: fix black/white/uvWhite of BT2020/BT2020C#4076

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quink-black wants to merge 8 commits intoopencv:4.xfrom

quink-black:cudacodec-yuv2rgb

Commits on Feb 7, 2026

cudacodec: fix black/white/uvWhite of BT2020/BT2020C
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committed

Commits on Feb 24, 2026

cudacodec/test: move YuvConverter helpers and tests to HAVE_CUDA block
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cudacodec/test: replace imread with randu-generated test image
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cudacodec/test: replace new[]/delete[] with std::vector in generateTestImages
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cudacodec/test: fix scaling factor in getRgb2YuvMatrix
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cudacodec/test: add multi-colorspace matrix helpers
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cudacodec/test: add BT2020/BT709 YuvConverter test cases
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cudacodec/test: add default cases to suppress -Wswitch warnings
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