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[fix] DjVu gamma correction #921

Merged
merged 3 commits into from
Jun 10, 2019
Merged

[fix] DjVu gamma correction #921

merged 3 commits into from
Jun 10, 2019

Commits on Jun 10, 2019

  1. [fix] DjVu gamma correction 

    The existing implementation only worked in 8-bit mode. By using the `ddjvu_format_set_gamma()` function that comes with djvulibre it suddenly and attractively becomes Not Our Problem™.

I noticed this after doing a quick experiment with a custom power function `#ifdef __ANDROID_API__` like in https://stackoverflow.com/a/19488271/2470572

(For example, if Android define a custom power function, else `#define power(x, y) pow(x, y)`.)

I believe the proper way to go about it would probably be to ignore document-specific implementations and to do it in the blitbuffer, but this is quicker.

As a side effect, this fixes koreader/koreader#3493.
    @Frenzie
    Frenzie committed Jun 10, 2019
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  2. whitespace typo

    @Frenzie
    Frenzie committed Jun 10, 2019
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  3. cap values before passing 'em on

    @Frenzie
    Frenzie committed Jun 10, 2019
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