MagickCore  6.9.13-8
Convert, Edit, Or Compose Bitmap Images
composite-private.h
1 /*
2  Copyright 1999 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/artifact.h"
22 #include "magick/color.h"
23 #include "magick/image.h"
24 #include "magick/image-private.h"
25 #include "magick/pixel-private.h"
26 
27 #if defined(__cplusplus) || defined(c_plusplus)
28 extern "C" {
29 #endif
30 
31 /*
32  ImageMagick Alpha Composite Inline Methods (special export)
33 */
34 static inline MagickRealType RoundToUnity(const MagickRealType value)
35 {
36  return(value < 0.0 ? 0.0 : (value > 1.0) ? 1.0 : value);
37 }
38 
39 static inline MagickRealType MagickOver_(const MagickRealType p,
40  const MagickRealType alpha,const MagickRealType q,const MagickRealType beta)
41 {
42  MagickRealType
43  Da,
44  Sa;
45 
46  Sa=1.0-QuantumScale*alpha;
47  Da=1.0-QuantumScale*beta;
48  return(Sa*p+Da*q*(1.0-Sa));
49 }
50 
51 static inline void MagickCompositeOver(const PixelPacket *p,
52  const MagickRealType alpha,const PixelPacket *q,const MagickRealType beta,
53  PixelPacket *composite)
54 {
55  MagickRealType
56  Da,
57  gamma,
58  Sa;
59 
60  /*
61  Compose pixel p over pixel q with the given opacities.
62  */
63  Sa=1.0-QuantumScale*alpha;
64  Da=1.0-QuantumScale*beta;
65  gamma=Sa+Da-Sa*Da;
66 #if !defined(MAGICKCORE_HDRI_SUPPORT)
67  SetPixelOpacity(composite,ClampToQuantum(QuantumRange*(1.0-
68  RoundToUnity(gamma))));
69  gamma=PerceptibleReciprocal(gamma);
70  SetPixelRed(composite,ClampToQuantum(gamma*MagickOver_((MagickRealType)
71  GetPixelRed(p),alpha,(MagickRealType) GetPixelRed(q),beta)));
72  SetPixelGreen(composite,ClampToQuantum(gamma*MagickOver_((MagickRealType)
73  GetPixelGreen(p),alpha,(MagickRealType) GetPixelGreen(q),beta)));
74  SetPixelBlue(composite,ClampToQuantum(gamma*MagickOver_((MagickRealType)
75  GetPixelBlue(p),alpha,(MagickRealType) GetPixelBlue(q),beta)));
76 #else
77  SetPixelOpacity(composite,(MagickRealType) QuantumRange*(1.0-
78  RoundToUnity(gamma)));
79  gamma=PerceptibleReciprocal(gamma);
80  SetPixelRed(composite,gamma*MagickOver_((MagickRealType)
81  GetPixelRed(p),alpha,(MagickRealType) GetPixelRed(q),beta));
82  SetPixelGreen(composite,gamma*MagickOver_((MagickRealType)
83  GetPixelGreen(p),alpha,(MagickRealType) GetPixelGreen(q),beta));
84  SetPixelBlue(composite,gamma*MagickOver_((MagickRealType)
85  GetPixelBlue(p),alpha,(MagickRealType) GetPixelBlue(q),beta));
86 #endif
87 }
88 
89 static inline void MagickPixelCompositeOver(const MagickPixelPacket *p,
90  const MagickRealType alpha,const MagickPixelPacket *q,
91  const MagickRealType beta,MagickPixelPacket *composite)
92 {
93  MagickRealType
94  Da,
95  gamma,
96  Sa;
97 
98  /*
99  Compose pixel p over pixel q with the given opacities.
100  */
101  Sa=1.0-QuantumScale*alpha;
102  Da=1.0-QuantumScale*beta;
103  gamma=Sa+Da-Sa*Da;
104  composite->opacity=(MagickRealType) QuantumRange*(1.0-RoundToUnity(gamma));
105  gamma=PerceptibleReciprocal(gamma);
106  composite->red=gamma*MagickOver_(p->red,alpha,q->red,beta);
107  composite->green=gamma*MagickOver_(p->green,alpha,q->green,beta);
108  composite->blue=gamma*MagickOver_(p->blue,alpha,q->blue,beta);
109  if (q->colorspace == CMYKColorspace)
110  composite->index=gamma*MagickOver_(p->index,alpha,q->index,beta);
111 }
112 
113 static inline void MagickPixelCompositePlus(const MagickPixelPacket *p,
114  const MagickRealType alpha,const MagickPixelPacket *q,
115  const MagickRealType beta,MagickPixelPacket *composite)
116 {
117  MagickRealType
118  Da,
119  gamma,
120  Sa;
121 
122  /*
123  Add two pixels with the given opacities.
124  */
125  Sa=1.0-QuantumScale*alpha;
126  Da=1.0-QuantumScale*beta;
127  gamma=RoundToUnity(Sa+Da); /* 'Plus' blending -- not 'Over' blending */
128  composite->opacity=(MagickRealType) QuantumRange*(1.0-RoundToUnity(gamma));
129  gamma=PerceptibleReciprocal(gamma);
130  composite->red=gamma*(Sa*p->red+Da*q->red);
131  composite->green=gamma*(Sa*p->green+Da*q->green);
132  composite->blue=gamma*(Sa*p->blue+Da*q->blue);
133  if (q->colorspace == CMYKColorspace)
134  composite->index=gamma*(Sa*p->index+Da*q->index);
135 }
136 
137 /*
138  Blend pixel colors p and q by the amount given.
139 */
140 static inline void MagickPixelCompositeBlend(const MagickPixelPacket *p,
141  const MagickRealType alpha,const MagickPixelPacket *q,
142  const MagickRealType beta,MagickPixelPacket *composite)
143 {
144  MagickPixelCompositePlus(p,(MagickRealType) QuantumRange-alpha*
145  ((MagickRealType) QuantumRange-p->opacity),q,(MagickRealType)
146  QuantumRange-beta*((MagickRealType) QuantumRange-q->opacity),composite);
147 }
148 
149 /*
150  Blend pixel colors p and q by the amount given and area.
151 */
152 static inline void MagickPixelCompositeAreaBlend(const MagickPixelPacket *p,
153  const MagickRealType alpha,const MagickPixelPacket *q,
154  const MagickRealType beta,const MagickRealType area,
155  MagickPixelPacket *composite)
156 {
157  MagickPixelCompositePlus(p,(MagickRealType) QuantumRange-(1.0-area)*
158  ((MagickRealType) QuantumRange-alpha),q,(MagickRealType) QuantumRange-
159  area*((MagickRealType) QuantumRange-beta),composite);
160 }
161 
162 #if defined(__cplusplus) || defined(c_plusplus)
163 }
164 #endif
165 
166 #endif