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6a833797db
This commit: - Changes some of the #define and variable names for clarification and adds comments where appropriate. - Unifies :srgb and :icc-profile, making them fit into the same step of the decoding process and removing the weird interactions between both of them. - Makes :icc-profile take precedence over :srgb (to significantly reduce the number of confusing and useless special cases) - Moves BT709 decompanding (approximate or actual) to the shader in all cases, making it happen before upscaling (instead of the old 0.45 gamma function). This is the simpler and more proper way to do it. - Enables the approx gamma function to work with :srgb as well due to this (since they now share the gamma expansion code). - Renames :icc-approx-gamma to :approx-gamma since it is no longer tied to the ICC options or LittleCMS. - Uses gamma 2.4 as input space for the actual 3DLUT, this is now a pretty arbitrary factor but I picked 2.4 mainly because a higher pure power value here seems to produce visually better results with wide gamut profiles, rather then the previous 1.95 or BT.709. - Adds the input gamma space to the 3dlut cache header in case we change it more in the future, or even make it user customizable (though I don't see why the latter would really be necessary). - Fixes the OSD's gamma when using :srgb, which was previously still using the old (0.45) approximation in all cases. - Updates documentation on :srgb, it was still mentioning the old behavior from circa a year ago. This commit should serve to both open up and make the CMS/shader code much more accessible and less confusing/error-prone and simultaneously also improve the performance of 3DLUTs with wide gamut color spaces. I would liked to have made it more modular but almost all of these changes are interdependent, save for the documentation updates. Note: Right now, the "3DLUT takes precedence over SRGB" logic is just coded into gl_lcms.c's compile_shaders function. Ideally, this should be done earlier, when parsing the options (by overriding the actual opts.srgb flag) and output a warning to the user. Note: I'm not sure how well this works together with real-world subtitles that may need to be color corrected as well. I'm not sure whether :approx-gamma needs to apply to subtitles as well. I'll need to test this on proper files later. Note: As of now, linear light scaling is still intrinsically tied to either :srgb or :icc-profile. It would be thinkable to have this as an extra option, :linear-scaling or similar, that could be used with or without the two color management options.
20 lines
370 B
C
20 lines
370 B
C
#ifndef MP_GL_LCMS_H
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#define MP_GL_LCMS_H
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extern const struct m_sub_options mp_icc_conf;
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struct mp_icc_opts {
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char *profile;
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char *cache;
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char *size_str;
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int intent;
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};
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struct lut3d;
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struct mp_log;
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struct mpv_global;
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struct lut3d *mp_load_icc(struct mp_icc_opts *opts, struct mp_log *log,
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struct mpv_global *global);
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#endif
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