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Add support for reading and writing the cICP chunk #565

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Add support for reading and writing the cICP chunk #565

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Commits on Jun 22, 2024

  1. Add support for reading and writing the cICP chunk 

    This chunk was added in the third edition of the PNG specification and
contains Coding Independent Code Points (related to color space
description). It is fairly simple as it only contains four fields of one
byte each: Colour Primaries, Transfer Function, Matrix Coefficients,
Video Full Range Flag.

The test file originally comes from the related WPT test case:
https://github.com/web-platform-tests/wpt/blob/master/png/support/cicp-display-p3.png

Note that I reencoded the file to make it match libpng's default
encoding parameters (it only modifies the IDAT chunk).
    @LucasChollet
    LucasChollet committed Jun 22, 2024
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