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Imported from libpng-1.2.7rc1.tar

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Glenn Randers-Pehrson
2004-09-04 13:25:08 -05:00
parent 67864af957
commit 5b77916ecd
55 changed files with 183 additions and 135 deletions
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libpng.3
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@@ -1,6 +1,6 @@
.TH LIBPNG 3 "August 29, 2004"
.TH LIBPNG 3 "September 4, 2004"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.2.7beta2
libpng \- Portable Network Graphics (PNG) Reference Library 1.2.7rc1
.SH SYNOPSIS
\fI\fB
@@ -781,7 +781,7 @@ Following is a copy of the libpng.txt file that accompanies libpng.
.SH LIBPNG.TXT
libpng.txt - A description on how to use and modify libpng
libpng version 1.2.7beta2 - August 29, 2004
libpng version 1.2.7rc1 - September 4, 2004
Updated and distributed by Glenn Randers-Pehrson
<glennrp@users.sourceforge.net>
Copyright (c) 1998-2004 Glenn Randers-Pehrson
@@ -1548,14 +1548,14 @@ unless the library has been told to transform it into another format.
For example, 4 bit/pixel paletted or grayscale data will be returned
2 pixels/byte with the leftmost pixel in the high-order bits of the
byte, unless png_set_packing() is called. 8-bit RGB data will be stored
in RGB RGB RGB format unless png_set_filler() is called to insert filler
bytes, either before or after each RGB triplet. 16-bit RGB data will
be returned RRGGBB RRGGBB, with the most significant byte of the color
value first, unless png_set_strip_16() is called to transform it to
regular RGB RGB triplets, or png_set_filler() is called to insert
filler bytes, either before or after each RRGGBB triplet. Similarly,
8-bit or 16-bit grayscale data can be modified with png_set_filler()
or png_set_strip_16().
in RGB RGB RGB format unless png_set_filler() or png_set_add_alpha()
is called to insert filler bytes, either before or after each RGB triplet.
16-bit RGB data will be returned RRGGBB RRGGBB, with the most significant
byte of the color value first, unless png_set_strip_16() is called to
transform it to regular RGB RGB triplets, or png_set_filler|add alpha()
is called to insert filler bytes, either before or after each RRGGBB
triplet. Similarly, 8-bit or 16-bit grayscale data can be modified with
png_set_filler(), png_set_add_alpha(), or png_set_strip_16().
The following code transforms grayscale images of less than 8 to 8 bits,
changes paletted images to RGB, and adds a full alpha channel if there is
@@ -1640,6 +1640,16 @@ does not affect images that already have full alpha channels. To add an
opaque alpha channel, use filler=0xff or 0xffff and PNG_FILLER_AFTER which
will generate RGBA pixels.
Note that png_set_filler() does not change the color type. If you want
to do that, you can add a true alpha channel with
if (color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_GRAY)
png_set_add_alpha(png_ptr, filler, PNG_FILLER_AFTER);
where "filler" contains the alpha value to assign to each pixel.
This function became available in libpng-1.2.7.
If you are reading an image with an alpha channel, and you need the
data as ARGB instead of the normal PNG format RGBA:
@@ -3674,13 +3684,13 @@ application:
.SH IX. Y2K Compliance in libpng
August 29, 2004
September 4, 2004
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
This is your unofficial assurance that libpng from version 0.71 and
upward through 1.2.7beta2 are Y2K compliant. It is my belief that earlier
upward through 1.2.7rc1 are Y2K compliant. It is my belief that earlier
versions were also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer that
@@ -3824,6 +3834,8 @@ the first widely used release:
1.0.16 10 10016 10.so.0.1.0.16
1.2.6 13 10206 12.so.0.1.2.6
1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2
1.0.17rc1 10 10017 12.so.0.1.0.17rc1
1.2.7rc1 13 10207 12.so.0.1.2.7rc1
Henceforth the source version will match the shared-library minor
and patch numbers; the shared-library major version number will be
@@ -3879,7 +3891,7 @@ possible without all of you.
Thanks to Frank J. T. Wojcik for helping with the documentation.
Libpng version 1.2.7beta2 - August 29, 2004:
Libpng version 1.2.7rc1 - September 4, 2004:
Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
Currently maintained by Glenn Randers-Pehrson (glennrp@users.sourceforge.net).
@@ -3897,7 +3909,7 @@ included in the libpng distribution, the latter shall prevail.)
If you modify libpng you may insert additional notices immediately following
this sentence.
libpng version 1.2.6, August 29, 2004, is
libpng version 1.2.6, September 4, 2004, is
Copyright (c) 2004 Glenn Randers-Pehrson, and is
distributed according to the same disclaimer and license as libpng-1.2.5
with the following individual added to the list of Contributing Authors
@@ -3996,7 +4008,7 @@ certification mark of the Open Source Initiative.
Glenn Randers-Pehrson
glennrp@users.sourceforge.net
August 29, 2004
September 4, 2004
.\" end of man page