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Imported from libpng-0.88.tar

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This commit is contained in:
Guy Schalnat
1996-01-26 01:38:47 -06:00
committed by Glenn Randers-Pehrson
parent 4ee97b0891
commit b2e01bd505
36 changed files with 3932 additions and 2578 deletions
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184
pngwrite.c
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@@ -1,10 +1,10 @@
/* pngwrite.c - general routines to write a png file
libpng 1.0 beta 2 - version 0.87
libpng 1.0 beta 2 - version 0.88
For conditions of distribution and use, see copyright notice in png.h
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
January 15, 1996
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
January 25, 1996
*/
/* get internal access to png.h */
@@ -16,7 +16,7 @@
write it, and put it in the correct location here. If you want
the chunk written after the image data, put it in png_write_end().
I strongly encurage you to supply a PNG_INFO_ flag, and check
info->valid before writing the chunk, as that will keep the code
info->valid before writing the chunk, as that will keep the code
from breaking if you want to just write a plain png file.
If you have long comments, I suggest writing them in png_write_end(),
and compressing them. */
@@ -88,7 +88,7 @@ png_write_info(png_structp png_ptr, png_infop info)
if (info->text[i].compression >= 0)
{
#if defined(PNG_WRITE_zTXt_SUPPORTED)
/* write compressed chunk */
/* write compressed chunk */
png_write_zTXt(png_ptr, info->text[i].key,
info->text[i].text, info->text[i].text_length,
info->text[i].compression);
@@ -99,7 +99,7 @@ png_write_info(png_structp png_ptr, png_infop info)
#if defined(PNG_WRITE_tEXt_SUPPORTED)
/* write uncompressed chunk */
png_write_tEXt(png_ptr, info->text[i].key,
info->text[i].text, info->text[i].text_length);
info->text[i].text, info->text[i].text_length);
#endif
}
}
@@ -114,7 +114,7 @@ png_write_info(png_structp png_ptr, png_infop info)
void
png_write_end(png_structp png_ptr, png_infop info)
{
/* see if user wants us to write information chunks */
/* see if user wants us to write information chunks */
if (info)
{
#if defined(PNG_WRITE_tIME_SUPPORTED)
@@ -130,7 +130,7 @@ png_write_end(png_structp png_ptr, png_infop info)
/* loop through comment chunks */
for (i = 0; i < info->num_text; i++)
{
{
/* check to see if comment is to be compressed */
if (info->text[i].compression >= 0)
{
@@ -148,7 +148,7 @@ png_write_end(png_structp png_ptr, png_infop info)
png_write_tEXt(png_ptr, info->text[i].key,
info->text[i].text, info->text[i].text_length);
#endif
}
}
}
}
#endif
@@ -161,12 +161,12 @@ png_write_end(png_structp png_ptr, png_infop info)
void
png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
{
ptime->year = (png_uint_16)(1900 + ttime->tm_year);
ptime->month = (png_byte)(ttime->tm_mon + 1);
ptime->day = (png_byte)ttime->tm_mday;
ptime->hour = (png_byte)ttime->tm_hour;
ptime->minute = (png_byte)ttime->tm_min;
ptime->second = (png_byte)ttime->tm_sec;
ptime->year = (png_uint_16)(1900 + ttime->tm_year);
ptime->month = (png_byte)(ttime->tm_mon + 1);
ptime->day = (png_byte)ttime->tm_mday;
ptime->hour = (png_byte)ttime->tm_hour;
ptime->minute = (png_byte)ttime->tm_min;
ptime->second = (png_byte)ttime->tm_sec;
}
void
@@ -184,23 +184,23 @@ void
png_write_init(png_structp png_ptr)
{
jmp_buf tmp_jmp; /* to save current jump buffer */
png_msg_ptr error_fn;
png_msg_ptr warning_fn;
png_voidp msg_ptr;
png_msg_ptr error_fn;
png_msg_ptr warning_fn;
png_voidp msg_ptr;
/* save jump buffer and error functions */
png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
error_fn = png_ptr->error_fn;
warning_fn = png_ptr->warning_fn;
msg_ptr = png_ptr->msg_ptr;
/* save jump buffer and error functions */
png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
error_fn = png_ptr->error_fn;
warning_fn = png_ptr->warning_fn;
msg_ptr = png_ptr->msg_ptr;
/* reset all variables to 0 */
png_memset(png_ptr, 0, sizeof (png_struct));
/* restore jump buffer and error functions */
/* reset all variables to 0 */
png_memset(png_ptr, 0, sizeof (png_struct));
/* restore jump buffer and error functions */
png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
png_ptr->error_fn = error_fn;
png_ptr->warning_fn = warning_fn;
png_ptr->msg_ptr = msg_ptr;
png_ptr->error_fn = error_fn;
png_ptr->warning_fn = warning_fn;
png_ptr->msg_ptr = msg_ptr;
/* initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
@@ -210,7 +210,7 @@ png_write_init(png_structp png_ptr)
/* 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" the image seven times */
void
png_write_rows(png_structp png_ptr, png_bytepp row,
png_uint_32 num_rows)
@@ -264,7 +264,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
{
switch (png_ptr->pass)
{
case 0:
case 0:
if (png_ptr->row_number & 7)
{
png_write_finish_row(png_ptr);
@@ -282,7 +282,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
if ((png_ptr->row_number & 7) != 4)
{
png_write_finish_row(png_ptr);
return;
return;
}
break;
case 3:
@@ -300,7 +300,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
}
break;
case 5:
if ((png_ptr->row_number & 1) || png_ptr->width < 2)
if ((png_ptr->row_number & 1) || png_ptr->width < 2)
{
png_write_finish_row(png_ptr);
return;
@@ -318,12 +318,12 @@ png_write_row(png_structp png_ptr, png_bytep row)
#endif
/* set up row info for transformations */
png_ptr->row_info.color_type = png_ptr->color_type;
png_ptr->row_info.color_type = png_ptr->color_type;
png_ptr->row_info.width = png_ptr->usr_width;
png_ptr->row_info.channels = png_ptr->usr_channels;
png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
png_ptr->row_info.channels);
png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
png_ptr->row_info.channels);
png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
(png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
@@ -336,7 +336,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
(png_ptr->transformations & PNG_INTERLACE))
{
png_do_write_interlace(&(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->pass);
png_ptr->row_buf + 1, png_ptr->pass);
/* this should always get caught above, but still ... */
if (!(png_ptr->row_info.width))
{
@@ -354,7 +354,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
if (png_ptr->do_filter)
{
/* save row to previous row */
png_memcpy(png_ptr->save_row, png_ptr->row_buf,
png_memcpy(png_ptr->save_row, png_ptr->row_buf,
(png_size_t)png_ptr->row_info.rowbytes + 1);
/* filter row */
@@ -363,7 +363,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
/* trade saved pointer and prev pointer so next row references are correctly */
{ /* scope limiter */
png_bytep tptr;
png_bytep tptr;
tptr = png_ptr->prev_row;
png_ptr->prev_row = png_ptr->save_row;
@@ -372,7 +372,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
}
else
/* set filter row to "none" */
png_ptr->row_buf[0] = 0;
png_ptr->row_buf[0] = 0;
/* set up the zlib input buffer */
png_ptr->zstream->next_in = png_ptr->row_buf;
@@ -389,8 +389,8 @@ png_write_row(png_structp png_ptr, png_bytep row)
{
if (png_ptr->zstream->msg)
png_error(png_ptr, png_ptr->zstream->msg);
else
png_error(png_ptr, "zlib error");
else
png_error(png_ptr, "zlib error");
}
/* see if it is time to write another IDAT */
@@ -404,17 +404,17 @@ png_write_row(png_structp png_ptr, png_bytep row)
/* repeat until all data has been compressed */
} while (png_ptr->zstream->avail_in);
/* finish row - updates counters and flushes zlib if last row */
png_write_finish_row(png_ptr);
/* finish row - updates counters and flushes zlib if last row */
png_write_finish_row(png_ptr);
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
png_ptr->flush_rows++;
png_ptr->flush_rows++;
if (png_ptr->flush_dist > 0 &&
png_ptr->flush_rows >= png_ptr->flush_dist)
{
png_write_flush(png_ptr);
}
if (png_ptr->flush_dist > 0 &&
png_ptr->flush_rows >= png_ptr->flush_dist)
{
png_write_flush(png_ptr);
}
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
}
@@ -423,57 +423,57 @@ png_write_row(png_structp png_ptr, png_bytep row)
void
png_set_flush(png_structp png_ptr, int nrows)
{
png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
}
/* flush the current output buffers now */
void
png_write_flush(png_structp png_ptr)
{
int wrote_IDAT;
int wrote_IDAT;
if (png_ptr->mode != PNG_HAVE_IDAT)
return;
if (png_ptr->mode != PNG_HAVE_IDAT)
return;
do
{
int ret;
do
{
int ret;
/* compress the data */
ret = deflate(png_ptr->zstream, Z_SYNC_FLUSH);
wrote_IDAT = 0;
/* compress the data */
ret = deflate(png_ptr->zstream, Z_SYNC_FLUSH);
wrote_IDAT = 0;
/* check for compression errors */
if (ret != Z_OK)
{
if (png_ptr->zstream->msg)
png_error(png_ptr, png_ptr->zstream->msg);
else
png_error(png_ptr, "zlib error");
}
/* check for compression errors */
if (ret != Z_OK)
{
if (png_ptr->zstream->msg)
png_error(png_ptr, png_ptr->zstream->msg);
else
png_error(png_ptr, "zlib error");
}
if (!png_ptr->zstream->avail_out)
{
/* write the IDAT and reset the zlib output buffer */
png_write_IDAT(png_ptr, png_ptr->zbuf,
png_ptr->zbuf_size);
png_ptr->zstream->next_out = png_ptr->zbuf;
png_ptr->zstream->avail_out = (uInt)png_ptr->zbuf_size;
wrote_IDAT = 1;
}
} while(wrote_IDAT == 1);
if (!png_ptr->zstream->avail_out)
{
/* write the IDAT and reset the zlib output buffer */
png_write_IDAT(png_ptr, png_ptr->zbuf,
png_ptr->zbuf_size);
png_ptr->zstream->next_out = png_ptr->zbuf;
png_ptr->zstream->avail_out = (uInt)png_ptr->zbuf_size;
wrote_IDAT = 1;
}
} while(wrote_IDAT == 1);
/* If there is any data left to be output, write it into a new IDAT */
if (png_ptr->zbuf_size != png_ptr->zstream->avail_out)
{
/* write the IDAT and reset the zlib output buffer */
png_write_IDAT(png_ptr, png_ptr->zbuf,
png_ptr->zbuf_size - png_ptr->zstream->avail_out);
png_ptr->zstream->next_out = png_ptr->zbuf;
png_ptr->zstream->avail_out = (uInt)png_ptr->zbuf_size;
}
png_ptr->flush_rows = 0;
png_flush(png_ptr);
/* If there is any data left to be output, write it into a new IDAT */
if (png_ptr->zbuf_size != png_ptr->zstream->avail_out)
{
/* write the IDAT and reset the zlib output buffer */
png_write_IDAT(png_ptr, png_ptr->zbuf,
png_ptr->zbuf_size - png_ptr->zstream->avail_out);
png_ptr->zstream->next_out = png_ptr->zbuf;
png_ptr->zstream->avail_out = (uInt)png_ptr->zbuf_size;
}
png_ptr->flush_rows = 0;
png_flush(png_ptr);
}
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
@@ -482,10 +482,10 @@ png_write_flush(png_structp png_ptr)
void
png_write_destroy(png_structp png_ptr)
{
jmp_buf tmp_jmp; /* save jump buffer */
jmp_buf tmp_jmp; /* save jump buffer */
/* free any memory zlib uses */
deflateEnd(png_ptr->zstream);
deflateEnd(png_ptr->zstream);
png_free(png_ptr, png_ptr->zstream);
/* free our memory. png_free checks NULL for us. */
png_large_free(png_ptr, png_ptr->zbuf);
@@ -515,7 +515,7 @@ void
png_set_compression_mem_level(png_structp png_ptr, int mem_level)
{
png_ptr->zlib_custom_mem_level = 1;
png_ptr->zlib_mem_level = mem_level;
png_ptr->zlib_mem_level = mem_level;
}
void