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[libpng16] Edited comments in png.c

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This commit is contained in:
Glenn Randers-Pehrson 2014-10-03 18:08:34 -05:00
parent 91e3a7d735
commit ca9c3a601b
1 changed files with 9 additions and 9 deletions
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18
png.c
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@ -773,13 +773,13 @@ png_get_copyright(png_const_structrp png_ptr)
#else #else
# ifdef __STDC__ # ifdef __STDC__
return PNG_STRING_NEWLINE \ return PNG_STRING_NEWLINE \
"libpng version 1.6.14beta06 - October 1, 2014" PNG_STRING_NEWLINE \ "libpng version 1.6.14beta06 - October 3, 2014" PNG_STRING_NEWLINE \
"Copyright (c) 1998-2014 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \ "Copyright (c) 1998-2014 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
"Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \ "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
"Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \ "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
PNG_STRING_NEWLINE; PNG_STRING_NEWLINE;
# else # else
return "libpng version 1.6.14beta06 - October 1, 2014\ return "libpng version 1.6.14beta06 - October 3, 2014\
Copyright (c) 1998-2014 Glenn Randers-Pehrson\ Copyright (c) 1998-2014 Glenn Randers-Pehrson\
Copyright (c) 1996-1997 Andreas Dilger\ Copyright (c) 1996-1997 Andreas Dilger\
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc."; Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
@ -3571,8 +3571,8 @@ png_log16bit(png_uint_32 x)
* each case only the low 16 bits are relevant - the fraction - since the * each case only the low 16 bits are relevant - the fraction - since the
* integer bits (the top 4) simply determine a shift. * integer bits (the top 4) simply determine a shift.
* *
* The worst case is the 16-bit distinction between 65535 and 65534, this * The worst case is the 16-bit distinction between 65535 and 65534. This
* requires perhaps spurious accuracty in the decoding of the logarithm to * requires perhaps spurious accuracy in the decoding of the logarithm to
* distinguish log2(65535/65534.5) - 10^-5 or 17 bits. There is little chance * distinguish log2(65535/65534.5) - 10^-5 or 17 bits. There is little chance
* of getting this accuracy in practice. * of getting this accuracy in practice.
* *
@ -3660,7 +3660,7 @@ png_exp8bit(png_fixed_point lg2)
/* Get a 32-bit value: */ /* Get a 32-bit value: */
png_uint_32 x = png_exp(lg2); png_uint_32 x = png_exp(lg2);
/* Convert the 32-bit value to 0..255 by multiplying by 256-1, note that the /* Convert the 32-bit value to 0..255 by multiplying by 256-1. Note that the
* second, rounding, step can't overflow because of the first, subtraction, * second, rounding, step can't overflow because of the first, subtraction,
* step. * step.
*/ */
@ -3842,7 +3842,7 @@ png_build_16to8_table(png_structrp png_ptr, png_uint_16pp *ptable,
/* 'num' is the number of tables and also the number of low bits of low /* 'num' is the number of tables and also the number of low bits of low
* bits of the input 16-bit value used to select a table. Each table is * bits of the input 16-bit value used to select a table. Each table is
* itself index by the high 8 bits of the value. * itself indexed by the high 8 bits of the value.
*/ */
for (i = 0; i < num; i++) for (i = 0; i < num; i++)
table[i] = (png_uint_16p)png_malloc(png_ptr, table[i] = (png_uint_16p)png_malloc(png_ptr,
@ -3894,7 +3894,7 @@ png_build_16to8_table(png_structrp png_ptr, png_uint_16pp *ptable,
/* Build a single 8-bit table: same as the 16-bit case but much simpler (and /* Build a single 8-bit table: same as the 16-bit case but much simpler (and
* typically much faster). Note that libpng currently does no sBIT processing * typically much faster). Note that libpng currently does no sBIT processing
* (apparently contrary to the spec) so a 256 entry table is always generated. * (apparently contrary to the spec) so a 256-entry table is always generated.
*/ */
static void static void
png_build_8bit_table(png_structrp png_ptr, png_bytepp ptable, png_build_8bit_table(png_structrp png_ptr, png_bytepp ptable,
@ -4035,7 +4035,7 @@ png_build_gamma_table(png_structrp png_ptr, int bit_depth)
* Where 'iv' is the input color value and 'ov' is the output value - * Where 'iv' is the input color value and 'ov' is the output value -
* pow(iv, gamma). * pow(iv, gamma).
* *
* Thus the gamma table consists of up to 256 256 entry tables. The table * Thus the gamma table consists of up to 256 256-entry tables. The table
* is selected by the (8-gamma_shift) most significant of the low 8 bits of * is selected by the (8-gamma_shift) most significant of the low 8 bits of
* the color value then indexed by the upper 8 bits: * the color value then indexed by the upper 8 bits:
* *
@ -4143,7 +4143,7 @@ png_set_option(png_structrp png_ptr, int option, int onoff)
* *
* error: -0.513727 - 0.607759, 308 (0.469978%) of readings inexact * error: -0.513727 - 0.607759, 308 (0.469978%) of readings inexact
* *
* In all cases the inexact readings are off by one. * In all cases the inexact readings are only off by one.
*/ */
#ifdef PNG_SIMPLIFIED_READ_SUPPORTED #ifdef PNG_SIMPLIFIED_READ_SUPPORTED