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Imported from libpng-0.97.tar

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This commit is contained in:
Glenn Randers-Pehrson
1998-01-01 07:13:13 -06:00
parent 47a0c422ca
commit b6ce43d6ff
24 changed files with 1297 additions and 763 deletions
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90
pngwrite.c
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@@ -1,12 +1,12 @@
/* pngwrite.c - general routines to write a PNG file
libpng 1.0 beta 6 - version 0.96
For conditions of distribution and use, see copyright notice in png.h
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
Copyright (c) 1996, 1997 Andreas Dilger
May 12, 1997
*/
*
* libpng 1.00.97
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* May 28, 1997
*/
/* get internal access to png.h */
#define PNG_INTERNAL
@@ -38,6 +38,10 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
if (info_ptr->valid & PNG_INFO_gAMA)
png_write_gAMA(png_ptr, info_ptr->gamma);
#endif
#if defined(PNG_WRITE_sRGB_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sRGB)
png_write_sRGB(png_ptr, info_ptr->srgb_intent);
#endif
#if defined(PNG_WRITE_sBIT_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sBIT)
png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
@@ -128,9 +132,10 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
}
/* Writes the end of the PNG file. If you don't want to write comments or
time information, you can pass NULL for info. If you already wrote these
in png_write_info(), do not write them again here. If you have long
comments, I suggest writing them here, and compressing them. */
* time information, you can pass NULL for info. If you already wrote these
* in png_write_info(), do not write them again here. If you have long
* comments, I suggest writing them here, and compressing them.
*/
void
png_write_end(png_structp png_ptr, png_infop info_ptr)
{
@@ -190,6 +195,28 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
png_write_IEND(png_ptr);
}
#if defined(PNG_TIME_RFC1152_SUPPORTED)
/* Convert the supplied time into an RFC 1152 string suitable for use in
* a "Creation Time" or other text-based time string.
*/
png_charp
png_convert_to_rfc1152(png_structp png_ptr, png_timep ptime)
{
const char *short_months[12] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
if (png_ptr->time_buffer == NULL)
{
png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, 29*sizeof(char));
}
sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
ptime->day % 31, short_months[ptime->month], ptime->year,
ptime->hour % 24, ptime->minute % 60, ptime->second % 61);
return png_ptr->time_buffer;
}
#endif /* PNG_TIME_RFC1152_SUPPORTED */
#if defined(PNG_WRITE_tIME_SUPPORTED)
void
png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
@@ -261,6 +288,11 @@ png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
png_set_write_fn(png_ptr, NULL, NULL, NULL);
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
1, NULL, NULL);
#endif
return (png_ptr);
}
@@ -292,10 +324,11 @@ png_write_init(png_structp png_ptr)
#endif
}
/* write a few rows of image data. If the image is interlaced,
either you will have to write the 7 sub images, or, if you
have called png_set_interlace_handling(), you will have to
"write" the image seven times */
/* Write a few rows of image data. If the image is interlaced,
* either you will have to write the 7 sub images, or, if you
* have called png_set_interlace_handling(), you will have to
* "write" the image seven times.
*/
void
png_write_rows(png_structp png_ptr, png_bytepp row,
png_uint_32 num_rows)
@@ -311,8 +344,9 @@ png_write_rows(png_structp png_ptr, png_bytepp row,
}
}
/* write the image. You only need to call this function once, even
if you are writing an interlaced image. */
/* Write the image. You only need to call this function once, even
* if you are writing an interlaced image.
*/
void
png_write_image(png_structp png_ptr, png_bytepp image)
{
@@ -339,7 +373,8 @@ png_write_image(png_structp png_ptr, png_bytepp image)
void
png_write_row(png_structp png_ptr, png_bytep row)
{
png_debug(1, "in png_write_row\n");
png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
png_ptr->row_number, png_ptr->pass);
/* initialize transformations and other stuff if first time */
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
{
@@ -415,12 +450,12 @@ png_write_row(png_structp png_ptr, png_bytep row)
png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
(png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
png_debug1(4, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
png_debug1(4, "row_info->width = %d\n", png_ptr->row_info.width);
png_debug1(4, "row_info->channels = %d\n", png_ptr->row_info.channels);
png_debug1(4, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
png_debug1(4, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
png_debug1(4, "row_info->rowbytes = %d\n", png_ptr->row_info.rowbytes);
png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
png_debug1(3, "row_info->width = %d\n", png_ptr->row_info.width);
png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);
png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
png_debug1(3, "row_info->rowbytes = %d\n", png_ptr->row_info.rowbytes);
/* Copy user's row into buffer, leaving room for filter byte. */
png_memcpy(png_ptr->row_buf + 1, row, png_ptr->row_info.rowbytes);
@@ -527,6 +562,9 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
if (info_ptr != NULL)
{
#ifdef PNG_WRITE_tEXt_SUPPORTED
png_free(png_ptr, info_ptr->text);
#endif
png_destroy_struct((png_voidp)info_ptr);
*info_ptr_ptr = (png_infop)NULL;
}
@@ -561,6 +599,9 @@ png_write_destroy(png_structp png_ptr)
png_free(png_ptr, png_ptr->up_row);
png_free(png_ptr, png_ptr->avg_row);
png_free(png_ptr, png_ptr->paeth_row);
#if defined(PNG_TIME_RFC1152_SUPPORTED)
png_free(png_ptr, png_ptr->time_buffer);
#endif /* PNG_TIME_RFC1152_SUPPORTED */
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
png_free(png_ptr, png_ptr->prev_filters);
png_free(png_ptr, png_ptr->filter_weights);
@@ -683,7 +724,8 @@ png_set_filter(png_structp png_ptr, int method, int filters)
* differences metric is relatively fast and effective, there is some
* question as to whether it can be improved upon by trying to keep the
* filtered data going to zlib more consistent, hopefully resulting in
* better compression. */
* better compression.
*/
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */
void
png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,