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