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[libpng16] Updated documentation about the simplified API.

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Glenn Randers-Pehrson
2012-02-04 10:31:38 -06:00
parent ce3c7330ba
commit 5578c3719e
6 changed files with 41 additions and 534 deletions
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19
png.h
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@@ -1,7 +1,7 @@
/* png.h - header file for PNG reference library
*
* libpng version 1.6.0beta11 - February 3, 2012
* libpng version 1.6.0beta11 - February 4, 2012
* Copyright (c) 1998-2012 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -11,7 +11,7 @@
* Authors and maintainers:
* libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
* libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
* libpng versions 0.97, January 1998, through 1.6.0beta11 - February 3, 2012: Glenn
* libpng versions 0.97, January 1998, through 1.6.0beta11 - February 4, 2012: Glenn
* See also "Contributing Authors", below.
*
* Note about libpng version numbers:
@@ -198,7 +198,7 @@
*
* This code is released under the libpng license.
*
* libpng versions 1.2.6, August 15, 2004, through 1.6.0beta11, February 3, 2012, are
* libpng versions 1.2.6, August 15, 2004, through 1.6.0beta11, February 4, 2012, are
* Copyright (c) 2004, 2006-2012 Glenn Randers-Pehrson, and are
* distributed according to the same disclaimer and license as libpng-1.2.5
* with the following individual added to the list of Contributing Authors:
@@ -310,7 +310,7 @@
* Y2K compliance in libpng:
* =========================
*
* February 3, 2012
* February 4, 2012
*
* Since the PNG Development group is an ad-hoc body, we can't make
* an official declaration.
@@ -376,7 +376,7 @@
/* Version information for png.h - this should match the version in png.c */
#define PNG_LIBPNG_VER_STRING "1.6.0beta11"
#define PNG_HEADER_VERSION_STRING \
" libpng version 1.6.0beta11 - February 3, 2012\n"
" libpng version 1.6.0beta11 - February 4, 2012\n"
#define PNG_LIBPNG_VER_SONUM 16
#define PNG_LIBPNG_VER_DLLNUM 16
@@ -2734,7 +2734,7 @@ typedef struct
* luminance channels the value is encoded according to the sRGB specification
* and matches the 8-bit format expected by typical display devices.
*
* The color/gray channels are not scaled (pre-multiplied) by the alpha
* The color/gray channels are not scaled (pre-multiplied) by the alpha
* channel and are suitable for passing to color management software.
*
* b) As a value in the range 0..65535, contained in a 2-byte integer. All
@@ -2743,7 +2743,12 @@ typedef struct
* the sRGB specification. This encoding is identified by the
* PNG_FORMAT_FLAG_LINEAR flag below.
*
* When an alpha channel is present it is expected to denote pixel coverage
* When the simplified API needs to convert between sRGB and linear colorspaces,
* the actual sRGB transfer curve defined in the sRGB specification (see the
* article at http://en.wikipedia.org/wiki/SRGB) is used, not the gamma=1/2.2
* approximation used elsewhere in libpng.
*
* When an alpha channel is present it is expected to denote pixel coverage
* of the color or luminance channels and is returned as an associated alpha
* channel: the color/gray channels are scaled (pre-multiplied) by the alpha
* value.