31aee0d0c0
Fixed point APIs are now supported throughout (no missing APIs).
Internal fixed point arithmetic support exists for all internal floating
point operations.
sCAL validates the floating point strings it is passed.
Safe, albeit rudimentary, Watcom support is provided by PNG_API_RULE==2
Two new APIs exist to get the number of passes without turning on the
PNG_INTERLACE transform and to get the number of rows in the current
pass.
A new test program, pngvalid.c, validates the gamma code.
Errors in the 16 bit gamma correction (overflows) have been corrected.
cHRM chunk testing is done consistently (previously the floating point
API bypassed it, because the test really didn't work on FP, now the test
is performed on the actual values to be stored in the PNG file so it
works in the FP case too.)
Most floating point APIs now simply call the fixed point APIs after
converting the values to the fixed point form used in the PNG file.
The standard headers no longer include zlib.h, which is currently only
required for pngstruct.h and can therefore be internal.
(Patches by John Bowler)
35 lines
1.0 KiB
Plaintext
35 lines
1.0 KiB
Plaintext
# pngminim/preader/pngusr.dfa
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#
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# Copyright (c) 2010 Glenn Randers-Pehrson
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#
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# This code is released under the libpng license.
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# For conditions of distribution and use, see the disclaimer
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# and license in png.h
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# First all the build options off:
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everything = off
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# Just switch on the progressive read code
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option PROGRESSIVE_READ on
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# You may choose fixed or floating point APIs:
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# option FLOATING_POINT on
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option FIXED_POINT on
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# You must chose the internal fixed point implementation or to
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# use the system floating point. The latter is considerably
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# smaller (by about 1kbyte on an x86 system):
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option FLOATING_ARITHMETIC on
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# option FLOATING_ARITHMETIC off
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# Your program will probably need other options. The example
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# program here, rpng2-x, requires the following. Take a look
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# at pnglibconf.h to find out the full set of what has to be
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# enabled to make the following work.
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option SETJMP on
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option STDIO on
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option READ_bKGD on
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option READ_GAMMA on
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option READ_EXPAND on
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option READ_16_TO_8 on
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option READ_GRAY_TO_RGB on
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