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[libpng16] fix: Update the cICP support for better compliance with PNG-3

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Apply the following corrections and improvements:
 * Add a validity check in `png_set_cICP`.
 * Fix the ordering check in `png_handle_cICP`.
 * Add a multiplicity check in `png_handle_cICP`.
 * Optimize the implementation of `png_write_cICP`.
 * Remove an unnecessary preprocessor guard from pngtest.c.
 * Update the dependency declaration in pnglibconf.dfa.
 * Fix the indentation where necessary.

This is a cherry-pick of commit c2a02691df1ecf51b7c97142752a7034350cb1f6
from branch 'libpng18'.
This commit is contained in:
Cosmin Truta
2024-12-31 22:05:03 +02:00
parent 75748d93ce
commit 823c2d80dc
8 changed files with 78 additions and 66 deletions
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15
pngwrite.c
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@@ -237,13 +237,14 @@ png_write_info(png_structrp png_ptr, png_const_inforp info_ptr)
#endif
#ifdef PNG_WRITE_cICP_SUPPORTED
if ((info_ptr->valid & PNG_INFO_cICP) != 0)
{
png_write_cICP(png_ptr, info_ptr->cicp_colour_primaries,
info_ptr->cicp_transfer_function,
info_ptr->cicp_matrix_coefficients,
info_ptr->cicp_video_full_range_flag);
}
if ((info_ptr->valid & PNG_INFO_cICP) != 0)
{
png_write_cICP(png_ptr,
info_ptr->cicp_colour_primaries,
info_ptr->cicp_transfer_function,
info_ptr->cicp_matrix_coefficients,
info_ptr->cicp_video_full_range_flag);
}
#endif
#ifdef PNG_WRITE_eXIf_SUPPORTED