michael@0: commit dfec2c249915560cedd2b49326c6629ad8a0b0f2
michael@0: Author: Jeff Muizelaar <jmuizelaar@mozilla.com>
michael@0: Date:   Tue Mar 2 16:01:41 2010 -0500
michael@0: 
michael@0:     add a stash of cairo_t's
michael@0: 
michael@0: diff --git a/src/cairo.c b/src/cairo.c
michael@0: index 3c9d892..4b27b83 100644
michael@0: --- a/src/cairo.c
michael@0: +++ b/src/cairo.c
michael@0: @@ -119,7 +119,63 @@ _cairo_set_error (cairo_t *cr, cairo_status_t status)
michael@0:      _cairo_status_set_error (&cr->status, _cairo_error (status));
michael@0:  }
michael@0:  
michael@0: -#if HAS_ATOMIC_OPS
michael@0: +#if defined(_MSC_VER)
michael@0: +#pragma intrinsic(_BitScanForward)
michael@0: +static __forceinline int
michael@0: +ffs(int x)
michael@0: +{
michael@0: +    unsigned long i;
michael@0: +
michael@0: +    if (_BitScanForward(&i, x) != 0)
michael@0: +	return i + 1;
michael@0: +
michael@0: +    return 0;
michael@0: +}
michael@0: +#endif
michael@0: +
michael@0: +
michael@0: +#if CAIRO_NO_MUTEX
michael@0: +/* We keep a small stash of contexts to reduce malloc pressure */
michael@0: +#define CAIRO_STASH_SIZE 4
michael@0: +static struct {
michael@0: +    cairo_t pool[CAIRO_STASH_SIZE];
michael@0: +    int occupied;
michael@0: +} _context_stash;
michael@0: +
michael@0: +static cairo_t *
michael@0: +_context_get (void)
michael@0: +{
michael@0: +    int avail, old, new;
michael@0: +
michael@0: +    old = _context_stash.occupied;
michael@0: +    avail = ffs (~old) - 1;
michael@0: +    if (avail >= CAIRO_STASH_SIZE)
michael@0: +	return malloc (sizeof (cairo_t));
michael@0: +
michael@0: +    new = old | (1 << avail);
michael@0: +    _context_stash.occupied = new;
michael@0: +
michael@0: +    return &_context_stash.pool[avail];
michael@0: +}
michael@0: +
michael@0: +static void
michael@0: +_context_put (cairo_t *cr)
michael@0: +{
michael@0: +    int old, new, avail;
michael@0: +
michael@0: +    if (cr < &_context_stash.pool[0] ||
michael@0: +	cr >= &_context_stash.pool[CAIRO_STASH_SIZE])
michael@0: +    {
michael@0: +	free (cr);
michael@0: +	return;
michael@0: +    }
michael@0: +
michael@0: +    avail = ~(1 << (cr - &_context_stash.pool[0]));
michael@0: +    old = _context_stash.occupied;
michael@0: +    new = old & avail;
michael@0: +    _context_stash.occupied = new;
michael@0: +}
michael@0: +#elif HAS_ATOMIC_OPS
michael@0:  /* We keep a small stash of contexts to reduce malloc pressure */
michael@0:  #define CAIRO_STASH_SIZE 4
michael@0:  static struct {