1 files changed, 0 insertions, 79 deletions
diff --git a/recipes/cairo/cairo-1.2.4/0002-Change-_cairo_fixed_from_double-to-use-the-magic-number-technique.diff b/recipes/cairo/cairo-1.2.4/0002-Change-_cairo_fixed_from_double-to-use-the-magic-number-technique.diff
deleted file mode 100644
index 56d8b7e99a..0000000000
--- a/recipes/cairo/cairo-1.2.4/0002-Change-_cairo_fixed_from_double-to-use-the-magic-number-technique.diff
+++ /dev/null
@@ -1,79 +0,0 @@
-From nobody Mon Sep 17 00:00:00 2001
-From: Dan Amelang <dan@amelang.net>
-Date: Sun Oct 29 21:31:23 2006 -0800
-Subject: [PATCH] Change _cairo_fixed_from_double to use the "magic number" technique
-
-See long thread here:
-http://lists.freedesktop.org/archives/cairo/2006-October/008285.html 
-
----
-
- src/cairo-fixed.c |   48 +++++++++++++++++++++++++++++++++++++++++++++++-
- 1 files changed, 47 insertions(+), 1 deletions(-)
-
-d88acddcabe770e17664b34a2d5f74d3926e1642
-diff --git a/src/cairo-fixed.c b/src/cairo-fixed.c
-index 604c9e7..fe6c2dc 100644
---- a/src/cairo-fixed.c
-+++ b/src/cairo-fixed.c
-@@ -42,10 +42,56 @@ _cairo_fixed_from_int (int i)
-     return i << 16;
- }
- 
-+/* This is the "magic number" approach to converting a double into fixed
-+ * point as described here:
-+ *
-+ * http://www.stereopsis.com/sree/fpu2006.html (an overview)
-+ * http://www.d6.com/users/checker/pdfs/gdmfp.pdf (in detail)
-+ *
-+ * The basic idea is to add a large enough number to the double that the
-+ * literal floating point is moved up to the extent that it forces the
-+ * double's value to be shifted down to the bottom of the mantissa (to make
-+ * room for the large number being added in). Since the mantissa is, at a
-+ * given moment in time, a fixed point integer itself, one can convert a
-+ * float to various fixed point representations by moving around the point
-+ * of a floating point number through arithmetic operations. This behavior
-+ * is reliable on most modern platforms as it is mandated by the IEEE-754
-+ * standard for floating point arithmetic.
-+ *
-+ * For our purposes, a "magic number" must be carefully selected that is
-+ * both large enough to produce the desired point-shifting effect, and also
-+ * has no lower bits in its representation that would interfere with our
-+ * value at the bottom of the mantissa. The magic number is calculated as
-+ * follows:
-+ *
-+ *          (2 ^ (MANTISSA_SIZE - FRACTIONAL_SIZE)) * 1.5
-+ *
-+ * where in our case:
-+ *  - MANTISSA_SIZE for 64-bit doubles is 52
-+ *  - FRACTIONAL_SIZE for 16.16 fixed point is 16
-+ *
-+ * Although this approach provides a very large speedup of this function
-+ * on a wide-array of systems, it does come with two caveats:
-+ *
-+ * 1) It uses banker's rounding as opposed to arithmetic rounding.
-+ * 2) It doesn't function properly if the FPU is in single-precision
-+ *    mode.
-+ */
-+#define CAIRO_MAGIC_NUMBER_FIXED_16_16 (103079215104.0)
- cairo_fixed_t
- _cairo_fixed_from_double (double d)
- {
--    return (cairo_fixed_t) floor (d * 65536 + 0.5);
-+    union {
-+        double d;
-+        int32_t i[2];
-+    } u;
-+
-+    u.d = d + CAIRO_MAGIC_NUMBER_FIXED_16_16;
-+#ifdef FLOAT_WORDS_BIGENDIAN
-+    return u.i[1];
-+#else
-+    return u.i[0];
-+#endif
- }
- 
- cairo_fixed_t
--- 
-1.2.6
-