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/* -*- 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 <pixman-config.h>
#endif
#include <math.h>
#include <string.h>
#include <float.h>
#include "pixman-private.h"
/* 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
*
*
* The specific documents of interest are the PDF spec itself:
*
*
* chapters 11.3.5 and 11.3.6 and a later supplement for Adobe Acrobat
* 9.1 and Reader 9.1:
*
*
* 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;
}