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Imported from libpng-0.89c.tar

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This commit is contained in:
Guy Schalnat
1996-06-17 16:24:45 -05:00
committed by Glenn Randers-Pehrson
parent e5a37797b4
commit c21f90c334
9 changed files with 37 additions and 33 deletions
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23
pngwutil.c
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@@ -912,6 +912,7 @@ png_write_finish_row(png_structp png_ptr)
/* next row */
png_ptr->row_number++;
/* see if we are done */
if (png_ptr->row_number < png_ptr->num_rows)
return;
@@ -947,13 +948,15 @@ png_write_finish_row(png_structp png_ptr)
}
/* reset the row above the image for the next pass */
if (png_ptr->prev_row)
png_memset(png_ptr->prev_row, 0, (((png_uint_32)png_ptr->usr_channels *
(png_uint_32)png_ptr->usr_bit_depth * png_ptr->width + 7) >> 3) + 1);
/* if we have more data to get, go get it */
if (png_ptr->pass < 7)
{
if (png_ptr->prev_row)
png_memset(png_ptr->prev_row, 0,
(((png_uint_32)png_ptr->usr_channels *
(png_uint_32)png_ptr->usr_bit_depth *
png_ptr->width + 7) >> 3) + 1);
return;
}
}
/* if we get here, we've just written the last row, so we need
@@ -1345,6 +1348,16 @@ png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row)
/* repeat until all data has been compressed */
} while (png_ptr->zstream->avail_in);
/* swap the current and previous rows */
if (png_ptr->prev_row)
{
png_bytep tptr;
tptr = png_ptr->prev_row;
png_ptr->prev_row = png_ptr->row_buf;
png_ptr->row_buf = tptr;
}
/* finish row - updates counters and flushes zlib if last row */
png_write_finish_row(png_ptr);