add pixman and libpngraylib

1 files changed, 1158 insertions, 0 deletions

diff --git a/libs/pixman-0.40.0/pixman/pixman-combine-float.c b/libs/pixman-0.40.0/pixman/pixman-combine-float.c
new file mode 100644
index 0000000..f5145bc
--- /dev/null
+++ b/libs/pixman-0.40.0/pixman/pixman-combine-float.c
@@ -0,0 +1,1158 @@
+/* -*- Mode: c; c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t; -*- */
+/*
+ * Copyright © 2010, 2012 Soren Sandmann Pedersen
+ * Copyright © 2010, 2012 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Author: Soren Sandmann Pedersen (sandmann@cs.au.dk)
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <math.h>
+#include <string.h>
+#include <float.h>
+
+#include "pixman-private.h"
+
+/* Workaround for http://gcc.gnu.org/PR54965 */
+/* GCC 4.6 has problems with force_inline, so just use normal inline instead */
+#if defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ == 6)
+#undef force_inline
+#define force_inline __inline__
+#endif
+
+typedef float (* combine_channel_t) (float sa, float s, float da, float d);
+
+static force_inline void
+combine_inner (pixman_bool_t component,
+	       float *dest, const float *src, const float *mask, int n_pixels,
+	       combine_channel_t combine_a, combine_channel_t combine_c)
+{
+    int i;
+
+    if (!mask)
+    {
+	for (i = 0; i < 4 * n_pixels; i += 4)
+	{
+	    float sa = src[i + 0];
+	    float sr = src[i + 1];
+	    float sg = src[i + 2];
+	    float sb = src[i + 3];
+	    
+	    float da = dest[i + 0];
+	    float dr = dest[i + 1];
+	    float dg = dest[i + 2];
+	    float db = dest[i + 3];					
+	    
+	    dest[i + 0] = combine_a (sa, sa, da, da);
+	    dest[i + 1] = combine_c (sa, sr, da, dr);
+	    dest[i + 2] = combine_c (sa, sg, da, dg);
+	    dest[i + 3] = combine_c (sa, sb, da, db);
+	}
+    }
+    else
+    {
+	for (i = 0; i < 4 * n_pixels; i += 4)
+	{
+	    float sa, sr, sg, sb;
+	    float ma, mr, mg, mb;
+	    float da, dr, dg, db;
+	    
+	    sa = src[i + 0];
+	    sr = src[i + 1];
+	    sg = src[i + 2];
+	    sb = src[i + 3];
+	    
+	    if (component)
+	    {
+		ma = mask[i + 0];
+		mr = mask[i + 1];
+		mg = mask[i + 2];
+		mb = mask[i + 3];
+
+		sr *= mr;
+		sg *= mg;
+		sb *= mb;
+
+		ma *= sa;
+		mr *= sa;
+		mg *= sa;
+		mb *= sa;
+		
+		sa = ma;
+	    }
+	    else
+	    {
+		ma = mask[i + 0];
+
+		sa *= ma;
+		sr *= ma;
+		sg *= ma;
+		sb *= ma;
+
+		ma = mr = mg = mb = sa;
+	    }
+	    
+	    da = dest[i + 0];
+	    dr = dest[i + 1];
+	    dg = dest[i + 2];
+	    db = dest[i + 3];
+	    
+	    dest[i + 0] = combine_a (ma, sa, da, da);
+	    dest[i + 1] = combine_c (mr, sr, da, dr);
+	    dest[i + 2] = combine_c (mg, sg, da, dg);
+	    dest[i + 3] = combine_c (mb, sb, da, db);
+	}
+    }
+}
+
+#define MAKE_COMBINER(name, component, combine_a, combine_c)		\
+    static void								\
+    combine_ ## name ## _float (pixman_implementation_t *imp,		\
+				pixman_op_t              op,		\
+				float                   *dest,		\
+				const float             *src,		\
+				const float             *mask,		\
+				int		         n_pixels)	\
+    {									\
+	combine_inner (component, dest, src, mask, n_pixels,		\
+		       combine_a, combine_c);				\
+    }
+
+#define MAKE_COMBINERS(name, combine_a, combine_c)			\
+    MAKE_COMBINER(name ## _ca, TRUE, combine_a, combine_c)		\
+    MAKE_COMBINER(name ## _u, FALSE, combine_a, combine_c)
+
+
+/*
+ * Porter/Duff operators
+ */
+typedef enum
+{
+    ZERO,
+    ONE,
+    SRC_ALPHA,
+    DEST_ALPHA,
+    INV_SA,
+    INV_DA,
+    SA_OVER_DA,
+    DA_OVER_SA,
+    INV_SA_OVER_DA,
+    INV_DA_OVER_SA,
+    ONE_MINUS_SA_OVER_DA,
+    ONE_MINUS_DA_OVER_SA,
+    ONE_MINUS_INV_DA_OVER_SA,
+    ONE_MINUS_INV_SA_OVER_DA
+} combine_factor_t;
+
+#define CLAMP(f)					\
+    (((f) < 0)? 0 : (((f) > 1.0) ? 1.0 : (f)))
+
+static force_inline float
+get_factor (combine_factor_t factor, float sa, float da)
+{
+    float f = -1;
+
+    switch (factor)
+    {
+    case ZERO:
+	f = 0.0f;
+	break;
+
+    case ONE:
+	f = 1.0f;
+	break;
+
+    case SRC_ALPHA:
+	f = sa;
+	break;
+
+    case DEST_ALPHA:
+	f = da;
+	break;
+
+    case INV_SA:
+	f = 1 - sa;
+	break;
+
+    case INV_DA:
+	f = 1 - da;
+	break;
+
+    case SA_OVER_DA:
+	if (FLOAT_IS_ZERO (da))
+	    f = 1.0f;
+	else
+	    f = CLAMP (sa / da);
+	break;
+
+    case DA_OVER_SA:
+	if (FLOAT_IS_ZERO (sa))
+	    f = 1.0f;
+	else
+	    f = CLAMP (da / sa);
+	break;
+
+    case INV_SA_OVER_DA:
+	if (FLOAT_IS_ZERO (da))
+	    f = 1.0f;
+	else
+	    f = CLAMP ((1.0f - sa) / da);
+	break;
+
+    case INV_DA_OVER_SA:
+	if (FLOAT_IS_ZERO (sa))
+	    f = 1.0f;
+	else
+	    f = CLAMP ((1.0f - da) / sa);
+	break;
+
+    case ONE_MINUS_SA_OVER_DA:
+	if (FLOAT_IS_ZERO (da))
+	    f = 0.0f;
+	else
+	    f = CLAMP (1.0f - sa / da);
+	break;
+
+    case ONE_MINUS_DA_OVER_SA:
+	if (FLOAT_IS_ZERO (sa))
+	    f = 0.0f;
+	else
+	    f = CLAMP (1.0f - da / sa);
+	break;
+
+    case ONE_MINUS_INV_DA_OVER_SA:
+	if (FLOAT_IS_ZERO (sa))
+	    f = 0.0f;
+	else
+	    f = CLAMP (1.0f - (1.0f - da) / sa);
+	break;
+
+    case ONE_MINUS_INV_SA_OVER_DA:
+	if (FLOAT_IS_ZERO (da))
+	    f = 0.0f;
+	else
+	    f = CLAMP (1.0f - (1.0f - sa) / da);
+	break;
+    }
+
+    return f;
+}
+
+#define MAKE_PD_COMBINERS(name, a, b)					\
+    static float force_inline						\
+    pd_combine_ ## name (float sa, float s, float da, float d)		\
+    {									\
+	const float fa = get_factor (a, sa, da);			\
+	const float fb = get_factor (b, sa, da);			\
+									\
+	return MIN (1.0f, s * fa + d * fb);				\
+    }									\
+    									\
+    MAKE_COMBINERS(name, pd_combine_ ## name, pd_combine_ ## name)
+
+MAKE_PD_COMBINERS (clear,			ZERO,				ZERO)
+MAKE_PD_COMBINERS (src,				ONE,				ZERO)
+MAKE_PD_COMBINERS (dst,				ZERO,				ONE)
+MAKE_PD_COMBINERS (over,			ONE,				INV_SA)
+MAKE_PD_COMBINERS (over_reverse,		INV_DA,				ONE)
+MAKE_PD_COMBINERS (in,				DEST_ALPHA,			ZERO)
+MAKE_PD_COMBINERS (in_reverse,			ZERO,				SRC_ALPHA)
+MAKE_PD_COMBINERS (out,				INV_DA,				ZERO)
+MAKE_PD_COMBINERS (out_reverse,			ZERO,				INV_SA)
+MAKE_PD_COMBINERS (atop,			DEST_ALPHA,			INV_SA)
+MAKE_PD_COMBINERS (atop_reverse,		INV_DA,				SRC_ALPHA)
+MAKE_PD_COMBINERS (xor,				INV_DA,				INV_SA)
+MAKE_PD_COMBINERS (add,				ONE,				ONE)
+
+MAKE_PD_COMBINERS (saturate,			INV_DA_OVER_SA,			ONE)
+
+MAKE_PD_COMBINERS (disjoint_clear,		ZERO,				ZERO)
+MAKE_PD_COMBINERS (disjoint_src,		ONE,				ZERO)
+MAKE_PD_COMBINERS (disjoint_dst,		ZERO,				ONE)
+MAKE_PD_COMBINERS (disjoint_over,		ONE,				INV_SA_OVER_DA)
+MAKE_PD_COMBINERS (disjoint_over_reverse,	INV_DA_OVER_SA,			ONE)
+MAKE_PD_COMBINERS (disjoint_in,			ONE_MINUS_INV_DA_OVER_SA,	ZERO)
+MAKE_PD_COMBINERS (disjoint_in_reverse,		ZERO,				ONE_MINUS_INV_SA_OVER_DA)
+MAKE_PD_COMBINERS (disjoint_out,		INV_DA_OVER_SA,			ZERO)
+MAKE_PD_COMBINERS (disjoint_out_reverse,	ZERO,				INV_SA_OVER_DA)
+MAKE_PD_COMBINERS (disjoint_atop,		ONE_MINUS_INV_DA_OVER_SA,	INV_SA_OVER_DA)
+MAKE_PD_COMBINERS (disjoint_atop_reverse,	INV_DA_OVER_SA,			ONE_MINUS_INV_SA_OVER_DA)
+MAKE_PD_COMBINERS (disjoint_xor,		INV_DA_OVER_SA,			INV_SA_OVER_DA)
+
+MAKE_PD_COMBINERS (conjoint_clear,		ZERO,				ZERO)
+MAKE_PD_COMBINERS (conjoint_src,		ONE,				ZERO)
+MAKE_PD_COMBINERS (conjoint_dst,		ZERO,				ONE)
+MAKE_PD_COMBINERS (conjoint_over,		ONE,				ONE_MINUS_SA_OVER_DA)
+MAKE_PD_COMBINERS (conjoint_over_reverse,	ONE_MINUS_DA_OVER_SA,		ONE)
+MAKE_PD_COMBINERS (conjoint_in,			DA_OVER_SA,			ZERO)
+MAKE_PD_COMBINERS (conjoint_in_reverse,		ZERO,				SA_OVER_DA)
+MAKE_PD_COMBINERS (conjoint_out,		ONE_MINUS_DA_OVER_SA,		ZERO)
+MAKE_PD_COMBINERS (conjoint_out_reverse,	ZERO,				ONE_MINUS_SA_OVER_DA)
+MAKE_PD_COMBINERS (conjoint_atop,		DA_OVER_SA,			ONE_MINUS_SA_OVER_DA)
+MAKE_PD_COMBINERS (conjoint_atop_reverse,	ONE_MINUS_DA_OVER_SA,		SA_OVER_DA)
+MAKE_PD_COMBINERS (conjoint_xor,		ONE_MINUS_DA_OVER_SA,		ONE_MINUS_SA_OVER_DA)
+
+/*
+ * PDF blend modes:
+ *
+ * The following blend modes have been taken from the PDF ISO 32000
+ * specification, which at this point in time is available from
+ *
+ *     http://www.adobe.com/devnet/pdf/pdf_reference.html
+ *
+ * The specific documents of interest are the PDF spec itself:
+ *
+ *     http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/devnet/pdf/pdfs/PDF32000_2008.pdf
+ *
+ * chapters 11.3.5 and 11.3.6 and a later supplement for Adobe Acrobat
+ * 9.1 and Reader 9.1:
+ *
+ *     http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/devnet/pdf/pdfs/adobe_supplement_iso32000_1.pdf
+ *
+ * that clarifies the specifications for blend modes ColorDodge and
+ * ColorBurn.
+ *
+ * The formula for computing the final pixel color given in 11.3.6 is:
+ *
+ *     αr × Cr = (1 – αs) × αb × Cb + (1 – αb) × αs × Cs + αb × αs × B(Cb, Cs)
+ *
+ * with B() is the blend function. When B(Cb, Cs) = Cs, this formula
+ * reduces to the regular OVER operator.
+ *
+ * Cs and Cb are not premultiplied, so in our implementation we instead
+ * use:
+ *
+ *     cr = (1 – αs) × cb  +  (1 – αb) × cs  +  αb × αs × B (cb/αb, cs/αs)
+ *
+ * where cr, cs, and cb are premultiplied colors, and where the
+ *
+ *     αb × αs × B(cb/αb, cs/αs)
+ *
+ * part is first arithmetically simplified under the assumption that αb
+ * and αs are not 0, and then updated to produce a meaningful result when
+ * they are.
+ *
+ * For all the blend mode operators, the alpha channel is given by
+ *
+ *     αr = αs + αb + αb × αs
+ */
+
+#define MAKE_SEPARABLE_PDF_COMBINERS(name)				\
+    static force_inline float						\
+    combine_ ## name ## _a (float sa, float s, float da, float d)	\
+    {									\
+	return da + sa - da * sa;					\
+    }									\
+    									\
+    static force_inline float						\
+    combine_ ## name ## _c (float sa, float s, float da, float d)	\
+    {									\
+	float f = (1 - sa) * d + (1 - da) * s;				\
+									\
+	return f + blend_ ## name (sa, s, da, d);			\
+    }									\
+    									\
+    MAKE_COMBINERS (name, combine_ ## name ## _a, combine_ ## name ## _c)
+
+/*
+ * Multiply
+ *
+ *      ad * as * B(d / ad, s / as)
+ *    = ad * as * d/ad * s/as
+ *    = d * s
+ *
+ */
+static force_inline float
+blend_multiply (float sa, float s, float da, float d)
+{
+    return d * s;
+}
+
+/*
+ * Screen
+ *
+ *      ad * as * B(d/ad, s/as)
+ *    = ad * as * (d/ad + s/as - s/as * d/ad)
+ *    = ad * s + as * d - s * d
+ */
+static force_inline float
+blend_screen (float sa, float s, float da, float d)
+{
+    return d * sa + s * da - s * d;
+}
+
+/*
+ * Overlay
+ *
+ *     ad * as * B(d/ad, s/as)
+ *   = ad * as * Hardlight (s, d)
+ *   = if (d / ad < 0.5)
+ *         as * ad * Multiply (s/as, 2 * d/ad)
+ *     else
+ *         as * ad * Screen (s/as, 2 * d / ad - 1)
+ *   = if (d < 0.5 * ad)
+ *         as * ad * s/as * 2 * d /ad
+ *     else
+ *         as * ad * (s/as + 2 * d / ad - 1 - s / as * (2 * d / ad - 1))
+ *   = if (2 * d < ad)
+ *         2 * s * d
+ *     else
+ *         ad * s + 2 * as * d - as * ad - ad * s * (2 * d / ad - 1)
+ *   = if (2 * d < ad)
+ *         2 * s * d
+ *     else
+ *         as * ad - 2 * (ad - d) * (as - s)
+ */
+static force_inline float
+blend_overlay (float sa, float s, float da, float d)
+{
+    if (2 * d < da)
+	return 2 * s * d;
+    else
+	return sa * da - 2 * (da - d) * (sa - s);
+}
+
+/*
+ * Darken
+ *
+ *     ad * as * B(d/ad, s/as)
+ *   = ad * as * MIN(d/ad, s/as)
+ *   = MIN (as * d, ad * s)
+ */
+static force_inline float
+blend_darken (float sa, float s, float da, float d)
+{
+    s = s * da;
+    d = d * sa;
+
+    if (s > d)
+	return d;
+    else
+	return s;
+}
+
+/*
+ * Lighten
+ *
+ *     ad * as * B(d/ad, s/as)
+ *   = ad * as * MAX(d/ad, s/as)
+ *   = MAX (as * d, ad * s)
+ */
+static force_inline float
+blend_lighten (float sa, float s, float da, float d)
+{
+    s = s * da;
+    d = d * sa;
+
+    if (s > d)
+	return s;
+    else
+	return d;
+}
+
+/*
+ * Color dodge
+ *
+ *     ad * as * B(d/ad, s/as)
+ *   = if d/ad = 0
+ *         ad * as * 0
+ *     else if (d/ad >= (1 - s/as)
+ *         ad * as * 1
+ *     else
+ *         ad * as * ((d/ad) / (1 - s/as))
+ *   = if d = 0
+ *         0
+ *     elif as * d >= ad * (as - s)
+ *         ad * as
+ *     else
+ *         as * (as * d / (as - s))
+ *
+ */
+static force_inline float
+blend_color_dodge (float sa, float s, float da, float d)
+{
+    if (FLOAT_IS_ZERO (d))
+	return 0.0f;
+    else if (d * sa >= sa * da - s * da)
+	return sa * da;
+    else if (FLOAT_IS_ZERO (sa - s))
+	return sa * da;
+    else
+	return sa * sa * d / (sa - s);
+}
+
+/*
+ * Color burn
+ *
+ * We modify the first clause "if d = 1" to "if d >= 1" since with
+ * premultiplied colors d > 1 can actually happen.
+ *
+ *     ad * as * B(d/ad, s/as)
+ *   = if d/ad >= 1
+ *         ad * as * 1
+ *     elif (1 - d/ad) >= s/as
+ *         ad * as * 0
+ *     else
+ *         ad * as * (1 - ((1 - d/ad) / (s/as)))
+ *   = if d >= ad
+ *         ad * as
+ *     elif as * ad - as * d >= ad * s
+ *         0
+ *     else
+ *         ad * as  - as * as * (ad - d) / s
+ */
+static force_inline float
+blend_color_burn (float sa, float s, float da, float d)
+{
+    if (d >= da)
+	return sa * da;
+    else if (sa * (da - d) >= s * da)
+	return 0.0f;
+    else if (FLOAT_IS_ZERO (s))
+	return 0.0f;
+    else
+	return sa * (da - sa * (da - d) / s);
+}
+
+/*
+ * Hard light
+ *
+ *     ad * as * B(d/ad, s/as)
+ *   = if (s/as <= 0.5)
+ *         ad * as * Multiply (d/ad, 2 * s/as)
+ *     else
+ *         ad * as * Screen (d/ad, 2 * s/as - 1)
+ *   = if 2 * s <= as
+ *         ad * as * d/ad * 2 * s / as
+ *     else
+ *         ad * as * (d/ad + (2 * s/as - 1) + d/ad * (2 * s/as - 1))
+ *   = if 2 * s <= as
+ *         2 * s * d
+ *     else
+ *         as * ad - 2 * (ad - d) * (as - s)
+ */
+static force_inline float
+blend_hard_light (float sa, float s, float da, float d)
+{
+    if (2 * s < sa)
+	return 2 * s * d;
+    else
+	return sa * da - 2 * (da - d) * (sa - s);
+}
+
+/*
+ * Soft light
+ *
+ *     ad * as * B(d/ad, s/as)
+ *   = if (s/as <= 0.5)
+ *         ad * as * (d/ad - (1 - 2 * s/as) * d/ad * (1 - d/ad))
+ *     else if (d/ad <= 0.25)
+ *         ad * as * (d/ad + (2 * s/as - 1) * ((((16 * d/ad - 12) * d/ad + 4) * d/ad) - d/ad))
+ *     else
+ *         ad * as * (d/ad + (2 * s/as - 1) * sqrt (d/ad))
+ *   = if (2 * s <= as)
+ *         d * as - d * (ad - d) * (as - 2 * s) / ad;
+ *     else if (4 * d <= ad)
+ *         (2 * s - as) * d * ((16 * d / ad - 12) * d / ad + 3);
+ *     else
+ *         d * as + (sqrt (d * ad) - d) * (2 * s - as);
+ */
+static force_inline float
+blend_soft_light (float sa, float s, float da, float d)
+{
+    if (2 * s <= sa)
+    {
+	if (FLOAT_IS_ZERO (da))
+	    return d * sa;
+	else
+	    return d * sa - d * (da - d) * (sa - 2 * s) / da;
+    }
+    else
+    {
+	if (FLOAT_IS_ZERO (da))
+	{
+	    return d * sa;
+	}
+	else
+	{
+	    if (4 * d <= da)
+		return d * sa + (2 * s - sa) * d * ((16 * d / da - 12) * d / da + 3);
+	    else
+		return d * sa + (sqrtf (d * da) - d) * (2 * s - sa);
+	}
+    }
+}
+
+/*
+ * Difference
+ *
+ *     ad * as * B(s/as, d/ad)
+ *   = ad * as * abs (s/as - d/ad)
+ *   = if (s/as <= d/ad)
+ *         ad * as * (d/ad - s/as)
+ *     else
+ *         ad * as * (s/as - d/ad)
+ *   = if (ad * s <= as * d)
+ *        as * d - ad * s
+ *     else
+ *        ad * s - as * d
+ */
+static force_inline float
+blend_difference (float sa, float s, float da, float d)
+{
+    float dsa = d * sa;
+    float sda = s * da;
+
+    if (sda < dsa)
+	return dsa - sda;
+    else
+	return sda - dsa;
+}
+
+/*
+ * Exclusion
+ *
+ *     ad * as * B(s/as, d/ad)
+ *   = ad * as * (d/ad + s/as - 2 * d/ad * s/as)
+ *   = as * d + ad * s - 2 * s * d
+ */
+static force_inline float
+blend_exclusion (float sa, float s, float da, float d)
+{
+    return s * da + d * sa - 2 * d * s;
+}
+
+MAKE_SEPARABLE_PDF_COMBINERS (multiply)
+MAKE_SEPARABLE_PDF_COMBINERS (screen)
+MAKE_SEPARABLE_PDF_COMBINERS (overlay)
+MAKE_SEPARABLE_PDF_COMBINERS (darken)
+MAKE_SEPARABLE_PDF_COMBINERS (lighten)
+MAKE_SEPARABLE_PDF_COMBINERS (color_dodge)
+MAKE_SEPARABLE_PDF_COMBINERS (color_burn)
+MAKE_SEPARABLE_PDF_COMBINERS (hard_light)
+MAKE_SEPARABLE_PDF_COMBINERS (soft_light)
+MAKE_SEPARABLE_PDF_COMBINERS (difference)
+MAKE_SEPARABLE_PDF_COMBINERS (exclusion)
+
+/*
+ * PDF nonseperable blend modes are implemented using the following functions
+ * to operate in Hsl space, with Cmax, Cmid, Cmin referring to the max, mid
+ * and min value of the red, green and blue components.
+ *
+ * LUM (C) = 0.3 × Cred + 0.59 × Cgreen + 0.11 × Cblue
+ *
+ * clip_color (C):
+ *     l = LUM (C)
+ *     min = Cmin
+ *     max = Cmax
+ *     if n < 0.0
+ *         C = l + (((C – l) × l) ⁄ (l – min))
+ *     if x > 1.0
+ *         C = l + (((C – l) × (1 – l) ) ⁄ (max – l))
+ *     return C
+ *
+ * set_lum (C, l):
+ *     d = l – LUM (C)
+ *     C += d
+ *     return clip_color (C)
+ *
+ * SAT (C) = CH_MAX (C) - CH_MIN (C)
+ *
+ * set_sat (C, s):
+ *     if Cmax > Cmin
+ *         Cmid = ( ( ( Cmid – Cmin ) × s ) ⁄ ( Cmax – Cmin ) )
+ *         Cmax = s
+ *     else
+ *         Cmid = Cmax = 0.0
+ *         Cmin = 0.0
+ *     return C
+ */
+
+/* For premultiplied colors, we need to know what happens when C is
+ * multiplied by a real number. LUM and SAT are linear:
+ *
+ *     LUM (r × C) = r × LUM (C)	SAT (r * C) = r * SAT (C)
+ *
+ * If we extend clip_color with an extra argument a and change
+ *
+ *     if x >= 1.0
+ *
+ * into
+ *
+ *     if x >= a
+ *
+ * then clip_color is also linear:
+ *
+ *     r * clip_color (C, a) = clip_color (r * C, r * a);
+ *
+ * for positive r.
+ *
+ * Similarly, we can extend set_lum with an extra argument that is just passed
+ * on to clip_color:
+ *
+ *       r * set_lum (C, l, a)
+ *
+ *     = r × clip_color (C + l - LUM (C), a)
+ *
+ *     = clip_color (r * C + r × l - r * LUM (C), r * a)
+ *
+ *     = set_lum (r * C, r * l, r * a)
+ *
+ * Finally, set_sat:
+ *
+ *       r * set_sat (C, s) = set_sat (x * C, r * s)
+ *
+ * The above holds for all non-zero x, because the x'es in the fraction for
+ * C_mid cancel out. Specifically, it holds for x = r:
+ *
+ *       r * set_sat (C, s) = set_sat (r * C, r * s)
+ *
+ */
+typedef struct
+{
+    float	r;
+    float	g;
+    float	b;
+} rgb_t;
+
+static force_inline float
+minf (float a, float b)
+{
+    return a < b? a : b;
+}
+
+static force_inline float
+maxf (float a, float b)
+{
+    return a > b? a : b;
+}
+
+static force_inline float
+channel_min (const rgb_t *c)
+{
+    return minf (minf (c->r, c->g), c->b);
+}
+
+static force_inline float
+channel_max (const rgb_t *c)
+{
+    return maxf (maxf (c->r, c->g), c->b);
+}
+
+static force_inline float
+get_lum (const rgb_t *c)
+{
+    return c->r * 0.3f + c->g * 0.59f + c->b * 0.11f;
+}
+
+static force_inline float
+get_sat (const rgb_t *c)
+{
+    return channel_max (c) - channel_min (c);
+}
+
+static void
+clip_color (rgb_t *color, float a)
+{
+    float l = get_lum (color);
+    float n = channel_min (color);
+    float x = channel_max (color);
+    float t;
+
+    if (n < 0.0f)
+    {
+	t = l - n;
+	if (FLOAT_IS_ZERO (t))
+	{
+	    color->r = 0.0f;
+	    color->g = 0.0f;
+	    color->b = 0.0f;
+	}
+	else
+	{
+	    color->r = l + (((color->r - l) * l) / t);
+	    color->g = l + (((color->g - l) * l) / t);
+	    color->b = l + (((color->b - l) * l) / t);
+	}
+    }
+    if (x > a)
+    {
+	t = x - l;
+	if (FLOAT_IS_ZERO (t))
+	{
+	    color->r = a;
+	    color->g = a;
+	    color->b = a;
+	}
+	else
+	{
+	    color->r = l + (((color->r - l) * (a - l) / t));
+	    color->g = l + (((color->g - l) * (a - l) / t));
+	    color->b = l + (((color->b - l) * (a - l) / t));
+	}
+    }
+}
+
+static void
+set_lum (rgb_t *color, float sa, float l)
+{
+    float d = l - get_lum (color);
+
+    color->r = color->r + d;
+    color->g = color->g + d;
+    color->b = color->b + d;
+
+    clip_color (color, sa);
+}
+
+static void
+set_sat (rgb_t *src, float sat)
+{
+    float *max, *mid, *min;
+    float t;
+
+    if (src->r > src->g)
+    {
+	if (src->r > src->b)
+	{
+	    max = &(src->r);
+
+	    if (src->g > src->b)
+	    {
+		mid = &(src->g);
+		min = &(src->b);
+	    }
+	    else
+	    {
+		mid = &(src->b);
+		min = &(src->g);
+	    }
+	}
+	else
+	{
+	    max = &(src->b);
+	    mid = &(src->r);
+	    min = &(src->g);
+	}
+    }
+    else
+    {
+	if (src->r > src->b)
+	{
+	    max = &(src->g);
+	    mid = &(src->r);
+	    min = &(src->b);
+	}
+	else
+	{
+	    min = &(src->r);
+
+	    if (src->g > src->b)
+	    {
+		max = &(src->g);
+		mid = &(src->b);
+	    }
+	    else
+	    {
+		max = &(src->b);
+		mid = &(src->g);
+	    }
+	}
+    }
+
+    t = *max - *min;
+
+    if (FLOAT_IS_ZERO (t))
+    {
+	*mid = *max = 0.0f;
+    }
+    else
+    {
+	*mid = ((*mid - *min) * sat) / t;
+	*max = sat;
+    }
+
+    *min = 0.0f;
+}
+
+/* Hue:
+ *
+ *       as * ad * B(s/as, d/as)
+ *     = as * ad * set_lum (set_sat (s/as, SAT (d/ad)), LUM (d/ad), 1)
+ *     = set_lum (set_sat (ad * s, as * SAT (d)), as * LUM (d), as * ad)
+ *
+ */
+static force_inline void
+blend_hsl_hue (rgb_t *res,
+	       const rgb_t *dest, float da,
+	       const rgb_t *src, float sa)
+{
+    res->r = src->r * da;
+    res->g = src->g * da;
+    res->b = src->b * da;
+
+    set_sat (res, get_sat (dest) * sa);
+    set_lum (res, sa * da, get_lum (dest) * sa);
+}
+
+/* 
+ * Saturation
+ *
+ *     as * ad * B(s/as, d/ad)
+ *   = as * ad * set_lum (set_sat (d/ad, SAT (s/as)), LUM (d/ad), 1)
+ *   = set_lum (as * ad * set_sat (d/ad, SAT (s/as)),
+ *                                       as * LUM (d), as * ad)
+ *   = set_lum (set_sat (as * d, ad * SAT (s), as * LUM (d), as * ad))
+ */
+static force_inline void
+blend_hsl_saturation (rgb_t *res,
+		      const rgb_t *dest, float da,
+		      const rgb_t *src, float sa)
+{
+    res->r = dest->r * sa;
+    res->g = dest->g * sa;
+    res->b = dest->b * sa;
+
+    set_sat (res, get_sat (src) * da);
+    set_lum (res, sa * da, get_lum (dest) * sa);
+}
+
+/* 
+ * Color
+ *
+ *     as * ad * B(s/as, d/as)
+ *   = as * ad * set_lum (s/as, LUM (d/ad), 1)
+ *   = set_lum (s * ad, as * LUM (d), as * ad)
+ */
+static force_inline void
+blend_hsl_color (rgb_t *res,
+		 const rgb_t *dest, float da,
+		 const rgb_t *src, float sa)
+{
+    res->r = src->r * da;
+    res->g = src->g * da;
+    res->b = src->b * da;
+
+    set_lum (res, sa * da, get_lum (dest) * sa);
+}
+
+/*
+ * Luminosity
+ *
+ *     as * ad * B(s/as, d/ad)
+ *   = as * ad * set_lum (d/ad, LUM (s/as), 1)
+ *   = set_lum (as * d, ad * LUM (s), as * ad)
+ */
+static force_inline void
+blend_hsl_luminosity (rgb_t *res,
+		      const rgb_t *dest, float da,
+		      const rgb_t *src, float sa)
+{
+    res->r = dest->r * sa;
+    res->g = dest->g * sa;
+    res->b = dest->b * sa;
+
+    set_lum (res, sa * da, get_lum (src) * da);
+}
+
+#define MAKE_NON_SEPARABLE_PDF_COMBINERS(name)				\
+    static void								\
+    combine_ ## name ## _u_float (pixman_implementation_t *imp,		\
+				  pixman_op_t              op,		\
+				  float                   *dest,	\
+				  const float             *src,		\
+				  const float             *mask,	\
+				  int		           n_pixels)	\
+    {									\
+    	int i;								\
+									\
+	for (i = 0; i < 4 * n_pixels; i += 4)				\
+	{								\
+	    float sa, da;						\
+	    rgb_t sc, dc, rc;						\
+									\
+	    sa = src[i + 0];						\
+	    sc.r = src[i + 1];						\
+	    sc.g = src[i + 2];						\
+	    sc.b = src[i + 3];						\
+									\
+	    da = dest[i + 0];						\
+	    dc.r = dest[i + 1];						\
+	    dc.g = dest[i + 2];						\
+	    dc.b = dest[i + 3];						\
+									\
+	    if (mask)							\
+	    {								\
+		float ma = mask[i + 0];					\
+									\
+		/* Component alpha is not supported for HSL modes */	\
+		sa *= ma;						\
+		sc.r *= ma;						\
+		sc.g *= ma;						\
+		sc.g *= ma;						\
+	    }								\
+									\
+	    blend_ ## name (&rc, &dc, da, &sc, sa);			\
+									\
+	    dest[i + 0] = sa + da - sa * da;				\
+	    dest[i + 1] = (1 - sa) * dc.r + (1 - da) * sc.r + rc.r;	\
+	    dest[i + 2] = (1 - sa) * dc.g + (1 - da) * sc.g + rc.g;	\
+	    dest[i + 3] = (1 - sa) * dc.b + (1 - da) * sc.b + rc.b;	\
+	}								\
+    }
+
+MAKE_NON_SEPARABLE_PDF_COMBINERS(hsl_hue)
+MAKE_NON_SEPARABLE_PDF_COMBINERS(hsl_saturation)
+MAKE_NON_SEPARABLE_PDF_COMBINERS(hsl_color)
+MAKE_NON_SEPARABLE_PDF_COMBINERS(hsl_luminosity)
+
+void
+_pixman_setup_combiner_functions_float (pixman_implementation_t *imp)
+{
+    /* Unified alpha */
+    imp->combine_float[PIXMAN_OP_CLEAR] = combine_clear_u_float;
+    imp->combine_float[PIXMAN_OP_SRC] = combine_src_u_float;
+    imp->combine_float[PIXMAN_OP_DST] = combine_dst_u_float;
+    imp->combine_float[PIXMAN_OP_OVER] = combine_over_u_float;
+    imp->combine_float[PIXMAN_OP_OVER_REVERSE] = combine_over_reverse_u_float;
+    imp->combine_float[PIXMAN_OP_IN] = combine_in_u_float;
+    imp->combine_float[PIXMAN_OP_IN_REVERSE] = combine_in_reverse_u_float;
+    imp->combine_float[PIXMAN_OP_OUT] = combine_out_u_float;
+    imp->combine_float[PIXMAN_OP_OUT_REVERSE] = combine_out_reverse_u_float;
+    imp->combine_float[PIXMAN_OP_ATOP] = combine_atop_u_float;
+    imp->combine_float[PIXMAN_OP_ATOP_REVERSE] = combine_atop_reverse_u_float;
+    imp->combine_float[PIXMAN_OP_XOR] = combine_xor_u_float;
+    imp->combine_float[PIXMAN_OP_ADD] = combine_add_u_float;
+    imp->combine_float[PIXMAN_OP_SATURATE] = combine_saturate_u_float;
+
+    /* Disjoint, unified */
+    imp->combine_float[PIXMAN_OP_DISJOINT_CLEAR] = combine_disjoint_clear_u_float;
+    imp->combine_float[PIXMAN_OP_DISJOINT_SRC] = combine_disjoint_src_u_float;
+    imp->combine_float[PIXMAN_OP_DISJOINT_DST] = combine_disjoint_dst_u_float;
+    imp->combine_float[PIXMAN_OP_DISJOINT_OVER] = combine_disjoint_over_u_float;
+    imp->combine_float[PIXMAN_OP_DISJOINT_OVER_REVERSE] = combine_disjoint_over_reverse_u_float;
+    imp->combine_float[PIXMAN_OP_DISJOINT_IN] = combine_disjoint_in_u_float;
+    imp->combine_float[PIXMAN_OP_DISJOINT_IN_REVERSE] = combine_disjoint_in_reverse_u_float;
+    imp->combine_float[PIXMAN_OP_DISJOINT_OUT] = combine_disjoint_out_u_float;
+    imp->combine_float[PIXMAN_OP_DISJOINT_OUT_REVERSE] = combine_disjoint_out_reverse_u_float;
+    imp->combine_float[PIXMAN_OP_DISJOINT_ATOP] = combine_disjoint_atop_u_float;
+    imp->combine_float[PIXMAN_OP_DISJOINT_ATOP_REVERSE] = combine_disjoint_atop_reverse_u_float;
+    imp->combine_float[PIXMAN_OP_DISJOINT_XOR] = combine_disjoint_xor_u_float;
+
+    /* Conjoint, unified */
+    imp->combine_float[PIXMAN_OP_CONJOINT_CLEAR] = combine_conjoint_clear_u_float;
+    imp->combine_float[PIXMAN_OP_CONJOINT_SRC] = combine_conjoint_src_u_float;
+    imp->combine_float[PIXMAN_OP_CONJOINT_DST] = combine_conjoint_dst_u_float;
+    imp->combine_float[PIXMAN_OP_CONJOINT_OVER] = combine_conjoint_over_u_float;
+    imp->combine_float[PIXMAN_OP_CONJOINT_OVER_REVERSE] = combine_conjoint_over_reverse_u_float;
+    imp->combine_float[PIXMAN_OP_CONJOINT_IN] = combine_conjoint_in_u_float;
+    imp->combine_float[PIXMAN_OP_CONJOINT_IN_REVERSE] = combine_conjoint_in_reverse_u_float;
+    imp->combine_float[PIXMAN_OP_CONJOINT_OUT] = combine_conjoint_out_u_float;
+    imp->combine_float[PIXMAN_OP_CONJOINT_OUT_REVERSE] = combine_conjoint_out_reverse_u_float;
+    imp->combine_float[PIXMAN_OP_CONJOINT_ATOP] = combine_conjoint_atop_u_float;
+    imp->combine_float[PIXMAN_OP_CONJOINT_ATOP_REVERSE] = combine_conjoint_atop_reverse_u_float;
+    imp->combine_float[PIXMAN_OP_CONJOINT_XOR] = combine_conjoint_xor_u_float;
+
+    /* PDF operators, unified */
+    imp->combine_float[PIXMAN_OP_MULTIPLY] = combine_multiply_u_float;
+    imp->combine_float[PIXMAN_OP_SCREEN] = combine_screen_u_float;
+    imp->combine_float[PIXMAN_OP_OVERLAY] = combine_overlay_u_float;
+    imp->combine_float[PIXMAN_OP_DARKEN] = combine_darken_u_float;
+    imp->combine_float[PIXMAN_OP_LIGHTEN] = combine_lighten_u_float;
+    imp->combine_float[PIXMAN_OP_COLOR_DODGE] = combine_color_dodge_u_float;
+    imp->combine_float[PIXMAN_OP_COLOR_BURN] = combine_color_burn_u_float;
+    imp->combine_float[PIXMAN_OP_HARD_LIGHT] = combine_hard_light_u_float;
+    imp->combine_float[PIXMAN_OP_SOFT_LIGHT] = combine_soft_light_u_float;
+    imp->combine_float[PIXMAN_OP_DIFFERENCE] = combine_difference_u_float;
+    imp->combine_float[PIXMAN_OP_EXCLUSION] = combine_exclusion_u_float;
+
+    imp->combine_float[PIXMAN_OP_HSL_HUE] = combine_hsl_hue_u_float;
+    imp->combine_float[PIXMAN_OP_HSL_SATURATION] = combine_hsl_saturation_u_float;
+    imp->combine_float[PIXMAN_OP_HSL_COLOR] = combine_hsl_color_u_float;
+    imp->combine_float[PIXMAN_OP_HSL_LUMINOSITY] = combine_hsl_luminosity_u_float;
+
+    /* Component alpha combiners */
+    imp->combine_float_ca[PIXMAN_OP_CLEAR] = combine_clear_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_SRC] = combine_src_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_DST] = combine_dst_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_OVER] = combine_over_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_OVER_REVERSE] = combine_over_reverse_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_IN] = combine_in_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_IN_REVERSE] = combine_in_reverse_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_OUT] = combine_out_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_OUT_REVERSE] = combine_out_reverse_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_ATOP] = combine_atop_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_ATOP_REVERSE] = combine_atop_reverse_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_XOR] = combine_xor_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_ADD] = combine_add_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_SATURATE] = combine_saturate_ca_float;
+
+    /* Disjoint CA */
+    imp->combine_float_ca[PIXMAN_OP_DISJOINT_CLEAR] = combine_disjoint_clear_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_DISJOINT_SRC] = combine_disjoint_src_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_DISJOINT_DST] = combine_disjoint_dst_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_DISJOINT_OVER] = combine_disjoint_over_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_DISJOINT_OVER_REVERSE] = combine_disjoint_over_reverse_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_DISJOINT_IN] = combine_disjoint_in_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_DISJOINT_IN_REVERSE] = combine_disjoint_in_reverse_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_DISJOINT_OUT] = combine_disjoint_out_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_DISJOINT_OUT_REVERSE] = combine_disjoint_out_reverse_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_DISJOINT_ATOP] = combine_disjoint_atop_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_DISJOINT_ATOP_REVERSE] = combine_disjoint_atop_reverse_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_DISJOINT_XOR] = combine_disjoint_xor_ca_float;
+
+    /* Conjoint CA */
+    imp->combine_float_ca[PIXMAN_OP_CONJOINT_CLEAR] = combine_conjoint_clear_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_CONJOINT_SRC] = combine_conjoint_src_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_CONJOINT_DST] = combine_conjoint_dst_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_CONJOINT_OVER] = combine_conjoint_over_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_CONJOINT_OVER_REVERSE] = combine_conjoint_over_reverse_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_CONJOINT_IN] = combine_conjoint_in_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_CONJOINT_IN_REVERSE] = combine_conjoint_in_reverse_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_CONJOINT_OUT] = combine_conjoint_out_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_CONJOINT_OUT_REVERSE] = combine_conjoint_out_reverse_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_CONJOINT_ATOP] = combine_conjoint_atop_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_CONJOINT_ATOP_REVERSE] = combine_conjoint_atop_reverse_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_CONJOINT_XOR] = combine_conjoint_xor_ca_float;
+
+    /* PDF operators CA */
+    imp->combine_float_ca[PIXMAN_OP_MULTIPLY] = combine_multiply_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_SCREEN] = combine_screen_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_OVERLAY] = combine_overlay_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_DARKEN] = combine_darken_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_LIGHTEN] = combine_lighten_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_COLOR_DODGE] = combine_color_dodge_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_COLOR_BURN] = combine_color_burn_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_HARD_LIGHT] = combine_hard_light_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_SOFT_LIGHT] = combine_soft_light_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_DIFFERENCE] = combine_difference_ca_float;
+    imp->combine_float_ca[PIXMAN_OP_EXCLUSION] = combine_exclusion_ca_float;
+
+    /* It is not clear that these make sense, so make them noops for now */
+    imp->combine_float_ca[PIXMAN_OP_HSL_HUE] = combine_dst_u_float;
+    imp->combine_float_ca[PIXMAN_OP_HSL_SATURATION] = combine_dst_u_float;
+    imp->combine_float_ca[PIXMAN_OP_HSL_COLOR] = combine_dst_u_float;
+    imp->combine_float_ca[PIXMAN_OP_HSL_LUMINOSITY] = combine_dst_u_float;
+}