mirror of https://codeberg.org/nsxiv/nsxiv
add brightness and contrast (#396)
* Imlib2 supports modifying gamma, brightness and contrast directly while sxiv only supports gamma. Makes sense to extend it to brightness and contrast as well. * Since color corrections need to be aware of each other, they have been refactored into one centralized function. * This also makes the code more hackable as it makes it easier to add more color correction functions without them interfering with each other. Co-authored-by: 0ion9 <finticemo@gmail.com> Co-authored-by: NRK <nrk@disroot.org> Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/396 Reviewed-by: NRK <nrk@disroot.org> Reviewed-by: TAAPArthur <taaparthur@noreply.codeberg.org> Co-authored-by: Berke Kocaoğlu <kberke@metu.edu.tr> Co-committed-by: Berke Kocaoğlu <kberke@metu.edu.tr>pull/373/head
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