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Rev 6459 Rev 6644
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 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */
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 */
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/*
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/*
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 * This file aims to be system independent so it sees the underline
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 * This file aims to be system independent so it sees the underlying
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 * structures only using:
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 * structures only using:
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 * void *d : an 'opaque' view of the source of the pixels;
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 * void *d : an 'opaque' view of the source of the pixels;
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 * int width, height: dimensions in pixels;
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 * int width, height: dimensions in pixels;
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 * unsigned long (*gp)(void *d, int x, int y): a function which
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 * unsigned long (*gp)(void *d, int x, int y): a function which
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 *     returns the colour of the (x,y) pixels stored either as
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 *     returns the colour of the (x,y) pixels stored either as
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    png_destroy_write_struct(&png_ptr,  (png_infopp)NULL);
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    png_destroy_write_struct(&png_ptr,  (png_infopp)NULL);
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    return 0;
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    return 0;
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  }
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  }
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  /* Set error handling.  REQUIRED if you aren't supplying your own
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  /* Set error handling.  REQUIRED if you aren't supplying your own
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   * error hadnling functions in the png_create_write_struct() call.
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   * error handling functions in the png_create_write_struct() call.
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   */
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   */
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  if (setjmp(png_ptr->jmpbuf)) {
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  if (setjmp(png_ptr->jmpbuf)) {
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    /* If we get here, we had a problem writing the file */
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    /* If we get here, we had a problem writing the file */
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    free(scanline);
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    free(scanline);
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    png_destroy_write_struct(&png_ptr,  (png_infopp)NULL);
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    png_destroy_write_struct(&png_ptr,  (png_infopp)NULL);