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[libpng17] Add #ifdef PNG_WRITE_FILTERED_ROW around a use of prev_row.

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Glenn Randers-Pehrson 2012-12-17 12:12:49 -06:00
parent 3e23f45ba9
commit 99343407e6
1 changed files with 2 additions and 0 deletions
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2
pngwutil.c
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@ -3031,6 +3031,7 @@ png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row,
png_compress_IDAT(png_ptr, filtered_row, full_row_length, Z_NO_FLUSH); png_compress_IDAT(png_ptr, filtered_row, full_row_length, Z_NO_FLUSH);
#ifdef PNG_WRITE_FILTER_SUPPORTED
/* Swap the current and previous rows */ /* Swap the current and previous rows */
if (png_ptr->prev_row != NULL) if (png_ptr->prev_row != NULL)
{ {
@ -3040,6 +3041,7 @@ png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row,
png_ptr->prev_row = png_ptr->row_buf; png_ptr->prev_row = png_ptr->row_buf;
png_ptr->row_buf = tptr; png_ptr->row_buf = tptr;
} }
#endif /* PNG_WRITE_FILTER_SUPPORTED */
/* Finish row - updates counters and flushes zlib if last row */ /* Finish row - updates counters and flushes zlib if last row */
png_write_finish_row(png_ptr); png_write_finish_row(png_ptr);