mewin/libpng
1
0
Fork 0
mirror of https://git.code.sf.net/p/libpng/code.git synced 2025-07-10 18:04:09 +02:00
Code Issues Projects Releases Wiki Activity

[libpng16] Changed ICC profile support to allow use of an external color

Browse Source 
management system (CMS). In practice it is not possible to obtain cHRM
information reliably using just the end-point tags because they do not exist
in the vast majority of profiles.  Instead it is necessary to run the endpoints
through the ICC colorimetric intent transform (as described in the v4
spec).  Since this is likely to be too much code inside libpng for too
little gain (it implies a fairly complete CMS implementation) the code
has been changed to allow an external CMS to be used.  This code is
temporarily disabled until a suitable set of test cases using one or more
external CMS implementations have been implemented.
This commit is contained in:
John Bowler
2012-10-25 19:30:02 -05:00
committed by Glenn Randers-Pehrson
parent e6b710cb3f
commit f8dfd123e2
14 changed files with 821 additions and 944 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
scripts/pnglibconf.dfa
View File

@@ -478,6 +478,20 @@ option WRITE_TEXT requires WRITE_ANCILLARY_CHUNKS enables TEXT
option GAMMA disabled
option COLORSPACE enables GAMMA disabled
# ICC profile support; basic ICC profile support is enabled if iCCP chunk read
# or write is enabled. The application must perform all iCCP profile handling
# itself. If full support is enabled with the option below libpng will attempt
# to do more processing using the profile data itself, this includes setting
# appropriate values for cHRM and gAMA chunks if not present in the stream.
#
# ICC profile support is not build in to core libpng because of the size of the
# code required; an external ICC implementation must be passed to libpng to
# enable it.
#
# WARNING: this option is CURRENTLY UNTESTED because a test CMS implementation
# has not yet been written, as a result it is disabled in current beta builds.
option ICC requires iCCP enables SAVE_INT_32 disabled
# When an ICC profile is read, or png_set, it will be checked for a match
# against known sRGB profiles if the sRGB handling is enabled. This
# setting controls how much work is done during the check:
@@ -694,9 +708,10 @@ option CONVERT_tIME requires WRITE_ANCILLARY_CHUNKS
option WRITE_FILTER requires WRITE
option SAVE_INT_32 requires WRITE
# png_save_int_32 is required by the ancillary chunks oFFs and pCAL
option SAVE_INT_32 disabled
# png_save_int_32 is required internally for writing the ancillary chunks oFFs
# and pCAL and for both reading and writing iCCP (for the generation/checking of
# the corresponding cHRM/gAMA chunks) if full ICC is supported.
# added at libpng-1.5.4