1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/*
Copyright 1999-2014 ImageMagick Studio LLC, a non-profit organization
dedicated to making software imaging solutions freely available.
You may not use this file except in compliance with the License.
obtain a copy of the License at
http://www.imagemagick.org/script/license.php
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
MagickCore image composite private methods.
*/
#ifndef _MAGICKCORE_COMPOSITE_PRIVATE_H
#define _MAGICKCORE_COMPOSITE_PRIVATE_H
#include "magick/color.h"
#include "magick/image.h"
#include "magick/image-private.h"
#include "magick/pixel-private.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
/*
ImageMagick Alpha Composite Inline Methods (special export)
*/
static inline MagickRealType RoundToUnity(const MagickRealType value)
{
return(value < 0.0 ? 0.0 : (value > 1.0) ? 1.0 : value);
}
static inline MagickRealType MagickOver_(const MagickRealType p,
const MagickRealType alpha,const MagickRealType q,const MagickRealType beta)
{
return((1.0-QuantumScale*alpha)*p+(1.0-QuantumScale*beta)*q*
QuantumScale*alpha);
}
static inline void MagickCompositeOver(const PixelPacket *p,
const MagickRealType alpha,const PixelPacket *q,const MagickRealType beta,
PixelPacket *composite)
{
double
gamma;
/*
Compose pixel p over pixel q with the given opacities.
*/
if (alpha == TransparentOpacity)
{
if (composite != q)
*composite=(*q);
return;
}
gamma=1.0-QuantumScale*QuantumScale*alpha*beta;
#if !defined(MAGICKCORE_HDRI_SUPPORT)
composite->opacity=(Quantum) (QuantumRange*(1.0-gamma)+0.5);
gamma=PerceptibleReciprocal(gamma);
SetPixelRed(composite,gamma*MagickOver_((MagickRealType)
GetPixelRed(p),alpha,(MagickRealType) GetPixelRed(q),beta)+0.5);
SetPixelGreen(composite,gamma*MagickOver_((MagickRealType)
GetPixelGreen(p),alpha,(MagickRealType) GetPixelGreen(q),beta)+0.5);
SetPixelBlue(composite,gamma*MagickOver_((MagickRealType)
GetPixelBlue(p),alpha,(MagickRealType) GetPixelBlue(q),beta)+0.5);
#else
SetPixelOpacity(composite,QuantumRange*(1.0-gamma));
gamma=PerceptibleReciprocal(gamma);
SetPixelRed(composite,gamma*MagickOver_((MagickRealType)
GetPixelRed(p),alpha,(MagickRealType) GetPixelRed(q),beta));
SetPixelGreen(composite,gamma*MagickOver_((MagickRealType)
GetPixelGreen(p),alpha,(MagickRealType) GetPixelGreen(q),beta));
SetPixelBlue(composite,gamma*MagickOver_((MagickRealType)
GetPixelBlue(p),alpha,(MagickRealType) GetPixelBlue(q),beta));
#endif
}
static inline void MagickPixelCompositeOver(const MagickPixelPacket *p,
const MagickRealType alpha,const MagickPixelPacket *q,
const MagickRealType beta,MagickPixelPacket *composite)
{
double
gamma;
/*
Compose pixel p over pixel q with the given opacities.
*/
if (alpha == OpaqueOpacity)
{
*composite=(*p);
return;
}
gamma=1.0-QuantumScale*QuantumScale*alpha*beta;
composite->opacity=(MagickRealType) QuantumRange*(1.0-gamma);
gamma=PerceptibleReciprocal(gamma);
composite->red=gamma*MagickOver_(p->red,alpha,q->red,beta);
composite->green=gamma*MagickOver_(p->green,alpha,q->green,beta);
composite->blue=gamma*MagickOver_(p->blue,alpha,q->blue,beta);
if (q->colorspace == CMYKColorspace)
composite->index=gamma*MagickOver_(p->index,alpha,q->index,beta);
}
static inline void MagickPixelCompositePlus(const MagickPixelPacket *p,
const MagickRealType alpha,const MagickPixelPacket *q,
const MagickRealType beta,MagickPixelPacket *composite)
{
double
gamma;
MagickRealType
Da,
Sa;
/*
Add two pixels with the given opacities.
*/
Sa=1.0-QuantumScale*alpha;
Da=1.0-QuantumScale*beta;
gamma=RoundToUnity(Sa+Da); /* 'Plus' blending -- not 'Over' blending */
composite->opacity=(MagickRealType) QuantumRange*(1.0-gamma);
gamma=PerceptibleReciprocal(gamma);
composite->red=gamma*(Sa*p->red+Da*q->red);
composite->green=gamma*(Sa*p->green+Da*q->green);
composite->blue=gamma*(Sa*p->blue+Da*q->blue);
if (q->colorspace == CMYKColorspace)
composite->index=gamma*(Sa*p->index+Da*q->index);
}
/*
Blend pixel colors p and q by the amount given.
*/
static inline void MagickPixelCompositeBlend(const MagickPixelPacket *p,
const MagickRealType alpha,const MagickPixelPacket *q,
const MagickRealType beta,MagickPixelPacket *composite)
{
MagickPixelCompositePlus(p,(MagickRealType) (QuantumRange-alpha*
(QuantumRange-p->opacity)),q,(MagickRealType) (QuantumRange-beta*
(QuantumRange-q->opacity)),composite);
}
/*
Blend pixel colors p and q by the amount given and area.
*/
static inline void MagickPixelCompositeAreaBlend(const MagickPixelPacket *p,
const MagickRealType alpha,const MagickPixelPacket *q,
const MagickRealType beta,const MagickRealType area,
MagickPixelPacket *composite)
{
MagickPixelCompositePlus(p,(MagickRealType) QuantumRange-(1.0-area)*
(QuantumRange-alpha),q,(MagickRealType) (QuantumRange-area*(QuantumRange-
beta)),composite);
}
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif
#endif
|
