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[master] Use bitwise AND instead of integer arithmetic MOD in pngrutil.c

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calculation  of the png_ptr->rowbuf pointer into png_ptr->big_row_buf.
This commit is contained in:
Glenn Randers-Pehrson 2010-05-03 21:57:13 -05:00
parent cc0bff446b
commit a1587302aa
1 changed files with 3 additions and 11 deletions
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14
pngrutil.c
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@ -3312,11 +3312,6 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
if (row_bytes + 48 > png_ptr->old_big_row_buf_size)
{
#ifdef PNG_ALIGNED_MEMORY_SUPPORTED
png_size_t big_row_buf_address;
int row_buf_offset;
#endif
png_free(png_ptr, png_ptr->big_row_buf);
if (png_ptr->interlaced)
png_ptr->big_row_buf = (png_bytep)png_calloc(png_ptr,
@ -3330,12 +3325,9 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
/* Use 16-byte aligned memory for row_buf with at least 16 bytes
* of padding before and after row_buf.
*/
{
big_row_buf_address = (png_size_t)png_ptr->big_row_buf;
row_buf_offset = 32 - ((big_row_buf_address + 15) & 0x0F);
png_ptr->row_buf = png_ptr->big_row_buf + row_buf_offset;
}
png_ptr->old_big_row_buf_size = row_bytes + 48;
png_ptr->row_buf = png_ptr->big_row_buf + 32 -
(((unsigned long)png_ptr->big_row_buf + 15) & 0x0F);
png_ptr->old_big_row_buf_size = row_bytes + 48;
#else
/* Use 32 bytes of padding before and 16 bytes after row_buf. */
png_ptr->row_buf = png_ptr->big_row_buf + 32;