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Imported from libpng-1.0.1b.tar

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Glenn Randers-Pehrson
1998-05-02 12:52:25 -05:00
parent 896239be20
commit 1d96361273
29 changed files with 837 additions and 710 deletions
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87
png.h
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@@ -1,12 +1,12 @@
/* png.h - header file for PNG reference library
*
* libpng 1.0.1a
* libpng 1.0.1b
* For conditions of distribution and use, see the COPYRIGHT NOTICE below.
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998 Glenn Randers-Pehrson
* April 21, 1998
* May 2, 1998
*
* Note about libpng version numbers:
*
@@ -18,30 +18,31 @@
*
* source png.h png.h shared-lib
* version string int version
* ------- ------ ------ ----------
* 0.89c ("1.0 beta 3") 0.89 89 1.0.89
* 0.90 ("1.0 beta 4") 0.90 90 0.90 [should have been 2.0.90]
* 0.95 ("1.0 beta 5") 0.95 95 0.95 [should have been 2.0.95]
* 0.96 ("1.0 beta 6") 0.96 96 0.96 [should have been 2.0.96]
* 0.97b ("1.00.97 beta 7") 1.00.97 97 1.0.1 [should have been 2.0.97]
* 0.97c 0.97 97 2.0.97
* 0.98 0.98 98 2.0.98
* 0.99 0.99 98 2.0.99
* 0.99a-m 0.99 99 2.0.99
* 1.00 1.00 100 2.1.0 [int should be 10000]
* 1.0.0 1.0.0 100 2.1.0 [int should be 10000]
* 1.0.1 1.0.1 10001 2.1.0
* 1.0.1a 1.0.1a 10002 2.1.0
* ------- ------ ----- ----------
* 0.89c ("1.0 beta 3") 0.89 89 1.0.89
* 0.90 ("1.0 beta 4") 0.90 90 0.90 [should have been 2.0.90]
* 0.95 ("1.0 beta 5") 0.95 95 0.95 [should have been 2.0.95]
* 0.96 ("1.0 beta 6") 0.96 96 0.96 [should have been 2.0.96]
* 0.97b ("1.00.97 beta 7") 1.00.97 97 1.0.1 [should have been 2.0.97]
* 0.97c 0.97 97 2.0.97
* 0.98 0.98 98 2.0.98
* 0.99 0.99 98 2.0.99
* 0.99a-m 0.99 99 2.0.99
* 1.00 1.00 100 2.1.0 [int should be 10000]
* 1.0.0 1.0.0 100 2.1.0 [int should be 10000]
* 1.0.1 1.0.1 10001 2.1.0
* 1.0.1a 1.0.1a 10002 2.1.0
* 1.0.1b 1.0.1b 10002 2.1.0
*
* Henceforth the source version will match the shared-library minor
* and patch numbers; the shared-library major version number will be
* used for changes in backward compatibility, as it is intended.
* The PNG_PNGLIB_VER macro, which is not used within libpng but
* is available for applications, is an unsigned integer of the form
* xyyzz corresponding to the source version x.y.z (leading zeros in y and z).
* used for changes in backward compatibility, as it is intended. The
* PNG_PNGLIB_VER macro, which is not used within libpng but is available
* for applications, is an unsigned integer of the form xyyzz corresponding
* to the source version x.y.z (leading zeros in y and z).
*
* See libpng.txt or libpng.3 for more information. The PNG specification is
* available as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/>
* See libpng.txt or libpng.3 for more information. The PNG specification
* is available as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/>
* and as a W3C Recommendation <http://www.w3.org/TR/REC.png.html>
*
* Contributing Authors:
@@ -118,7 +119,7 @@ extern "C" {
*/
/* Version information for png.h - this should match the version in png.c */
#define PNG_LIBPNG_VER_STRING "1.0.1a"
#define PNG_LIBPNG_VER_STRING "1.0.1b"
/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
* We must not include leading zeros.
@@ -1443,6 +1444,45 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
#define png_debug2(l, m, p1, p2)
#endif /* (PNG_DEBUG > 0) */
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
/* With these routines, we avoid an integer divide, which will be slower on
* many machines. However, it does take more operations than the corresponding
* divide method, so it may be slower on some RISC systems. There are two
* shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
*
* Note that the rounding factors are NOT supposed to be the same! 128 and
* 32768 are correct for the NODIV code; 127 and 32767 are correct for the
* standard method.
*
* [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
*/
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
# define png_composite(composite, fg, alpha, bg) \
{ png_uint_16 temp = ((png_uint_16)(fg) * (png_uint_16)(alpha) + \
(png_uint_16)(bg)*(png_uint_16)(255 - \
(png_uint_16)(alpha)) + (png_uint_16)128); \
(composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
# define png_composite_16(composite, fg, alpha, bg) \
{ png_uint_32 temp = ((png_uint_32)(fg) * (png_uint_32)(alpha) + \
(png_uint_32)(bg)*(png_uint_32)(65535L - \
(png_uint_32)(alpha)) + (png_uint_32)32768L); \
(composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
#else /* standard method using integer division */
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
# define png_composite(composite, fg, alpha, bg) \
(composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
(png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
(png_uint_16)127) / 255)
# define png_composite_16(composite, fg, alpha, bg) \
(composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
(png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
(png_uint_32)32767) / (png_uint_32)65535L)
#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
/* These next functions are used internally in the code. They generally
* shouldn't be used unless you are writing code to add or replace some
* functionality in libpng. More information about most functions can
@@ -1525,6 +1565,7 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
#define PNG_FLAG_FREE_HIST 0x4000
#define PNG_FLAG_HAVE_CHUNK_HEADER 0x8000L
#define PNG_FLAG_WROTE_tIME 0x10000L
#define PNG_FLAG_BACKGROUND_IS_GRAY 0x20000L
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
PNG_FLAG_CRC_ANCILLARY_NOWARN)