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Imported from libpng-1.0.11beta3.tar

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This commit is contained in:
Glenn Randers-Pehrson
2001-04-14 20:15:41 -05:00
parent f64a06f5ec
commit e1eff58f87
53 changed files with 722 additions and 254 deletions
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43
pngwrite.c
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@@ -1,7 +1,7 @@
/* pngwrite.c - general routines to write a PNG file
*
* libpng 1.0.11beta2 - April 11, 2001
* libpng 1.0.11beta3 - April 15, 2001
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2001 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -512,6 +512,8 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
if (png_ptr->zbuf == (png_bytep)NULL)
png_error(png_ptr, "Could not allocate zbuf for writing");
png_set_write_fn(png_ptr, NULL, NULL, NULL);
@@ -581,6 +583,8 @@ png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
if (png_ptr->zbuf == (png_bytep)NULL)
png_error(png_ptr, "Could not allocate zbuf for writing");
png_set_write_fn(png_ptr, NULL, NULL, NULL);
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
@@ -1029,6 +1033,8 @@ png_set_filter(png_structp png_ptr, int method, int filters)
{
png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
if (png_ptr->sub_row == (png_bytep)NULL)
png_error(png_ptr, "Could not allocate sub_row");
png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
}
@@ -1043,6 +1049,10 @@ png_set_filter(png_structp png_ptr, int method, int filters)
{
png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
if (png_ptr->up_row == (png_bytep)NULL)
{
png_error(png_ptr, "Could not allocate sub_row");
}
png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
}
}
@@ -1058,6 +1068,8 @@ png_set_filter(png_structp png_ptr, int method, int filters)
{
png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
if (png_ptr->avg_row == (png_bytep)NULL)
png_error(png_ptr, "Could not allocate avg_row");
png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
}
}
@@ -1074,6 +1086,8 @@ png_set_filter(png_structp png_ptr, int method, int filters)
{
png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
if (png_ptr->paeth_row == (png_bytep)NULL)
png_error(png_ptr, "Could not allocate avg_row");
png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
}
}
@@ -1129,10 +1143,13 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
(png_uint_32)(sizeof(png_byte) * num_weights));
/* To make sure that the weighting starts out fairly */
for (i = 0; i < num_weights; i++)
if (png_ptr->prev_filters != (png_bytep)NULL)
{
png_ptr->prev_filters[i] = 255;
/* To make sure that the weighting starts out fairly */
for (i = 0; i < num_weights; i++)
{
png_ptr->prev_filters[i] = 255;
}
}
}
@@ -1143,12 +1160,22 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
(png_uint_32)(sizeof(png_uint_16) * num_weights));
for (i = 0; i < num_weights; i++)
if (png_ptr->inv_filter_weights == (png_uint_16p)NULL)
{
png_ptr->inv_filter_weights[i] =
png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
png_free(png_ptr, png_ptr->filter_weights);
png_ptr->filter_weights = NULL;
}
if (png_ptr->filter_weights != (png_uint_16p)NULL &&
png_ptr->inv_filter_weights != (png_uint_16p)NULL)
{
for (i = 0; i < num_weights; i++)
{
png_ptr->inv_filter_weights[i] =
png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
}
}
else
num_weights=0;
}
for (i = 0; i < num_weights; i++)