commit 5d56786eff3d367c8315b4f4d4c9d6fb02751b0e
author John Bowler <jbowler@acm.org> Sat Dec 24 09:12:00 2011 -0600
committer Glenn Randers-Pehrson <glennrp at users.sourceforge.net> Sat Dec 24 09:12:00 2011 -0600
tree 6e2ebfea6de35727bcc852da13fea2bd5b2ced1e
parent d7c22fb7ecfe0d533fc8f1783627803db07aab5e

[libpng16] Implemented 'restrict' for png_info and png_struct.

Added new "png_structrp" typedef. Because of the
way libpng works both png_info and png_struct are always accessed via a
single pointer.  This means adding C99 'restrict' to the pointer gives
the compiler some opportunity to optimize the code.  This change allows that.

pngwio.c

diff --git a/pngwio.c b/pngwio.c
index 9b30294..6f8525f 100644
--- a/pngwio.c
+++ b/pngwio.c
@@ -30,7 +30,7 @@
  */
 
 void /* PRIVATE */
-png_write_data(png_structp png_ptr, png_const_bytep data, png_size_t length)
+png_write_data(png_structrp png_ptr, png_const_bytep data, png_size_t length)
 {
    /* NOTE: write_data_fn must not change the buffer! */
    if (png_ptr->write_data_fn != NULL )
@@ -68,7 +68,7 @@
  */
 #ifdef PNG_WRITE_FLUSH_SUPPORTED
 void /* PRIVATE */
-png_flush(png_structp png_ptr)
+png_flush(png_structrp png_ptr)
 {
    if (png_ptr->output_flush_fn != NULL)
       (*(png_ptr->output_flush_fn))(png_ptr);
@@ -119,7 +119,7 @@
  *                 *FILE structure.
  */
 void PNGAPI
-png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
+png_set_write_fn(png_structrp png_ptr, png_voidp io_ptr,
     png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
 {
    if (png_ptr == NULL)