MagickCore  6.9.10
Convert, Edit, Or Compose Bitmap Images
composite-private.h
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1 /*
2  Copyright 1999-2020 ImageMagick Studio LLC, a non-profit organization
3  dedicated to making software imaging solutions freely available.
4 
5  You may not use this file except in compliance with the License. You may
6  obtain a copy of the License at
7 
8  https://imagemagick.org/script/license.php
9 
10  Unless required by applicable law or agreed to in writing, software
11  distributed under the License is distributed on an "AS IS" BASIS,
12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  See the License for the specific language governing permissions and
14  limitations under the License.
15 
16  MagickCore image composite private methods.
17 */
18 #ifndef MAGICKCORE_COMPOSITE_PRIVATE_H
19 #define MAGICKCORE_COMPOSITE_PRIVATE_H
20 
21 #include "magick/color.h"
22 #include "magick/image.h"
23 #include "magick/image-private.h"
24 #include "magick/pixel-private.h"
25 
26 #if defined(__cplusplus) || defined(c_plusplus)
27 extern "C" {
28 #endif
29 
30 /*
31  ImageMagick Alpha Composite Inline Methods (special export)
32 */
33 static inline MagickRealType RoundToUnity(const MagickRealType value)
34 {
35  return(value < 0.0 ? 0.0 : (value > 1.0) ? 1.0 : value);
36 }
37 
39  const MagickRealType alpha,const MagickRealType q,const MagickRealType beta)
40 {
42  Da,
43  Sa;
44 
45  Sa=1.0-QuantumScale*alpha;
46  Da=1.0-QuantumScale*beta;
47  return(Sa*p+Da*q*(1.0-Sa));
48 }
49 
50 static inline void MagickCompositeOver(const PixelPacket *p,
51  const MagickRealType alpha,const PixelPacket *q,const MagickRealType beta,
52  PixelPacket *composite)
53 {
55  Da,
56  gamma,
57  Sa;
58 
59  /*
60  Compose pixel p over pixel q with the given opacities.
61  */
62  Sa=1.0-QuantumScale*alpha;
63  Da=1.0-QuantumScale*beta;
64  gamma=Sa+Da-Sa*Da;
65 #if !defined(MAGICKCORE_HDRI_SUPPORT)
67  RoundToUnity(gamma))));
68  gamma=PerceptibleReciprocal(gamma);
70  GetPixelRed(p),alpha,(MagickRealType) GetPixelRed(q),beta)));
72  GetPixelGreen(p),alpha,(MagickRealType) GetPixelGreen(q),beta)));
74  GetPixelBlue(p),alpha,(MagickRealType) GetPixelBlue(q),beta)));
75 #else
76  SetPixelOpacity(composite,QuantumRange*(1.0-RoundToUnity(gamma)));
77  gamma=PerceptibleReciprocal(gamma);
78  SetPixelRed(composite,gamma*MagickOver_((MagickRealType)
79  GetPixelRed(p),alpha,(MagickRealType) GetPixelRed(q),beta));
80  SetPixelGreen(composite,gamma*MagickOver_((MagickRealType)
81  GetPixelGreen(p),alpha,(MagickRealType) GetPixelGreen(q),beta));
82  SetPixelBlue(composite,gamma*MagickOver_((MagickRealType)
83  GetPixelBlue(p),alpha,(MagickRealType) GetPixelBlue(q),beta));
84 #endif
85 }
86 
87 static inline void MagickPixelCompositeOver(const MagickPixelPacket *p,
88  const MagickRealType alpha,const MagickPixelPacket *q,
89  const MagickRealType beta,MagickPixelPacket *composite)
90 {
92  Da,
93  gamma,
94  Sa;
95 
96  /*
97  Compose pixel p over pixel q with the given opacities.
98  */
99  Sa=1.0-QuantumScale*alpha;
100  Da=1.0-QuantumScale*beta;
101  gamma=Sa+Da-Sa*Da;
102  composite->opacity=(MagickRealType) (QuantumRange*(1.0-RoundToUnity(gamma)));
103  gamma=PerceptibleReciprocal(gamma);
104  composite->red=gamma*MagickOver_(p->red,alpha,q->red,beta);
105  composite->green=gamma*MagickOver_(p->green,alpha,q->green,beta);
106  composite->blue=gamma*MagickOver_(p->blue,alpha,q->blue,beta);
107  if (q->colorspace == CMYKColorspace)
108  composite->index=gamma*MagickOver_(p->index,alpha,q->index,beta);
109 }
110 
111 static inline void MagickPixelCompositePlus(const MagickPixelPacket *p,
112  const MagickRealType alpha,const MagickPixelPacket *q,
113  const MagickRealType beta,MagickPixelPacket *composite)
114 {
116  Da,
117  gamma,
118  Sa;
119 
120  /*
121  Add two pixels with the given opacities.
122  */
123  Sa=1.0-QuantumScale*alpha;
124  Da=1.0-QuantumScale*beta;
125  gamma=RoundToUnity(Sa+Da); /* 'Plus' blending -- not 'Over' blending */
126  composite->opacity=(MagickRealType) QuantumRange*(1.0-RoundToUnity(gamma));
127  gamma=PerceptibleReciprocal(gamma);
128  composite->red=gamma*(Sa*p->red+Da*q->red);
129  composite->green=gamma*(Sa*p->green+Da*q->green);
130  composite->blue=gamma*(Sa*p->blue+Da*q->blue);
131  if (q->colorspace == CMYKColorspace)
132  composite->index=gamma*(Sa*p->index+Da*q->index);
133 }
134 
135 /*
136  Blend pixel colors p and q by the amount given.
137 */
138 static inline void MagickPixelCompositeBlend(const MagickPixelPacket *p,
139  const MagickRealType alpha,const MagickPixelPacket *q,
140  const MagickRealType beta,MagickPixelPacket *composite)
141 {
144  (QuantumRange-q->opacity)),composite);
145 }
146 
147 /*
148  Blend pixel colors p and q by the amount given and area.
149 */
151  const MagickRealType alpha,const MagickPixelPacket *q,
152  const MagickRealType beta,const MagickRealType area,
153  MagickPixelPacket *composite)
154 {
157  beta)),composite);
158 }
159 
160 #if defined(__cplusplus) || defined(c_plusplus)
161 }
162 #endif
163 
164 #endif
MagickDoubleType MagickRealType
Definition: magick-type.h:125
MagickRealType opacity
Definition: pixel.h:122
#define GetPixelBlue(pixel)
Definition: pixel-accessor.h:38
ColorspaceType colorspace
Definition: pixel.h:110
static void MagickPixelCompositeBlend(const MagickPixelPacket *p, const MagickRealType alpha, const MagickPixelPacket *q, const MagickRealType beta, MagickPixelPacket *composite)
Definition: composite-private.h:138
#define GetPixelGreen(pixel)
Definition: pixel-accessor.h:43
static void MagickPixelCompositeOver(const MagickPixelPacket *p, const MagickRealType alpha, const MagickPixelPacket *q, const MagickRealType beta, MagickPixelPacket *composite)
Definition: composite-private.h:87
static MagickRealType RoundToUnity(const MagickRealType value)
Definition: composite-private.h:33
Definition: pixel.h:131
static Quantum ClampToQuantum(const MagickRealType quantum)
Definition: quantum.h:88
#define GetPixelRed(pixel)
Definition: pixel-accessor.h:50
#define SetPixelGreen(pixel, value)
Definition: pixel-accessor.h:77
static double PerceptibleReciprocal(const double x)
Definition: pixel-accessor.h:124
Definition: pixel.h:104
static MagickRealType MagickOver_(const MagickRealType p, const MagickRealType alpha, const MagickRealType q, const MagickRealType beta)
Definition: composite-private.h:38
#define SetPixelRed(pixel, value)
Definition: pixel-accessor.h:82
static void MagickCompositeOver(const PixelPacket *p, const MagickRealType alpha, const PixelPacket *q, const MagickRealType beta, PixelPacket *composite)
Definition: composite-private.h:50
#define QuantumScale
Definition: magick-type.h:120
Definition: colorspace.h:39
#define SetPixelOpacity(pixel, value)
Definition: pixel-accessor.h:81
MagickRealType red
Definition: pixel.h:122
static void MagickPixelCompositePlus(const MagickPixelPacket *p, const MagickRealType alpha, const MagickPixelPacket *q, const MagickRealType beta, MagickPixelPacket *composite)
Definition: composite-private.h:111
static void MagickPixelCompositeAreaBlend(const MagickPixelPacket *p, const MagickRealType alpha, const MagickPixelPacket *q, const MagickRealType beta, const MagickRealType area, MagickPixelPacket *composite)
Definition: composite-private.h:150
MagickRealType green
Definition: pixel.h:122
MagickRealType blue
Definition: pixel.h:122
#define SetPixelBlue(pixel, value)
Definition: pixel-accessor.h:71
MagickRealType index
Definition: pixel.h:122
#define QuantumRange
Definition: magick-type.h:86