cairo 1.6.4 jpeg I/O support patch

Hello all,

This is an unofficial patch to cairo 1.6.4 that addes jpeg I/O support to cairo.

The original patch( to an older version of cairo) is not mine.
Please take a look at src/cairo-jpeg.c for credit(s).

Installation:
1. ./configure --enable-jpeg; make; make install as usual, or better
2. autoreconf to adapt the changes in configure.in to your enviroment.

For more information, please use diff against the standard release cairo-1.6.4

ABIs added ( similar to PNG ) :
cairo_get_default_jpeg_parameter
cairo_surface_write_to_jpeg
cairo_image_surface_create_from_jpeg
cairo_image_surface_create_from_jpeg_stream

To download, click the link below:
http://www.hn.is.uec.ac.jp/~vuhung/patches/cairo-1.6.4.jpeg-patch.tar.gz

A better average

    double variance(long long *x, int n)

    {

            double m = x[0];

            double s = 0;

            int i;

            for (i=0; i                    double m_new = m + (x[i] - m)/(i+1);

                    s = s + (x[i] - m)*(x[i] - m_new);

                    m = m_new;

            }

            return s / (n - 1);

    }



    double mean(long long *x, int n)

    {

            double m = x[0];

            int i;

            for (i=0; i                    m = m + (x[i] - m)/(i+1);

            }

            return m;

    }



    double stddev(long long *x, int n)

    {

            return sqrt(variance(x, n));

    }



     long long times[30];

   

     printf("mean: %f stddev: %f\n", mean(times, 20), stddev(times, 20));