MagickCore  6.8.5
pixel-accessor.h
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1 /*
2  Copyright 1999-2013 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.
6  obtain a copy of the License at
7 
8  http://www.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 pixel accessor methods.
17 */
18 #ifndef _MAGICKCORE_PIXEL_ACCESSOR_H
19 #define _MAGICKCORE_PIXEL_ACCESSOR_H
20 
21 #if defined(__cplusplus) || defined(c_plusplus)
22 extern "C" {
23 #endif
24 
25 #include <math.h>
26 #include "magick/gem.h"
27 #include "magick/pixel.h"
28 
29 #define ClampPixelRed(pixel) ClampToQuantum((pixel)->red)
30 #define ClampPixelGreen(pixel) ClampToQuantum((pixel)->green)
31 #define ClampPixelBlue(pixel) ClampToQuantum((pixel)->blue)
32 #define ClampPixelIndex(indexes) ClampToQuantum(*(indexes))
33 #define ClampPixelOpacity(pixel) ClampToQuantum((pixel)->opacity)
34 #define GetPixela(pixel) ((pixel)->green)
35 #define GetPixelb(pixel) ((pixel)->blue)
36 #define GetPixelAlpha(pixel) (QuantumRange-(pixel)->opacity)
37 #define GetPixelBlack(indexes) (*(indexes))
38 #define GetPixelBlue(pixel) ((pixel)->blue)
39 #define GetPixelCb(pixel) ((pixel)->green)
40 #define GetPixelCr(pixel) ((pixel)->blue)
41 #define GetPixelCyan(pixel) ((pixel)->red)
42 #define GetPixelGray(pixel) ((pixel)->red)
43 #define GetPixelGreen(pixel) ((pixel)->green)
44 #define GetPixelIndex(indexes) (*(indexes))
45 #define GetPixelL(pixel) ((pixel)->red)
46 #define GetPixelMagenta(pixel) ((pixel)->green)
47 #define GetPixelNext(pixel) ((pixel)+1)
48 #define GetPixelOpacity(pixel) ((pixel)->opacity)
49 #define GetPixelRed(pixel) ((pixel)->red)
50 #define GetPixelRGB(pixel,packet) \
51 { \
52  (packet)->red=GetPixelRed((pixel)); \
53  (packet)->green=GetPixelGreen((pixel)); \
54  (packet)->blue=GetPixelBlue((pixel)); \
55 }
56 #define GetPixelRGBO(pixel,packet) \
57 { \
58  (packet)->red=GetPixelRed((pixel)); \
59  (packet)->green=GetPixelGreen((pixel)); \
60  (packet)->blue=GetPixelBlue((pixel)); \
61  (packet)->opacity=GetPixelOpacity((pixel)); \
62 }
63 #define GetPixelY(pixel) ((pixel)->red)
64 #define GetPixelYellow(pixel) ((pixel)->blue)
65 #define SetPixela(pixel,value) ((pixel)->green=(Quantum) (value))
66 #define SetPixelAlpha(pixel,value) \
67  ((pixel)->opacity=(Quantum) (QuantumRange-(value)))
68 #define SetPixelb(pixel,value) ((pixel)->blue=(Quantum) (value))
69 #define SetPixelBlack(indexes,value) (*(indexes)=(Quantum) (value))
70 #define SetPixelBlue(pixel,value) ((pixel)->blue=(Quantum) (value))
71 #define SetPixelCb(pixel,value) ((pixel)->green=(Quantum) (value))
72 #define SetPixelCr(pixel,value) ((pixel)->blue=(Quantum) (value))
73 #define SetPixelCyan(pixel,value) ((pixel)->red=(Quantum) (value))
74 #define SetPixelGray(pixel,value) \
75  ((pixel)->red=(pixel)->green=(pixel)->blue=(Quantum) (value))
76 #define SetPixelGreen(pixel,value) ((pixel)->green=(Quantum) (value))
77 #define SetPixelIndex(indexes,value) (*(indexes)=(IndexPacket) (value))
78 #define SetPixelL(pixel,value) ((pixel)->red=(Quantum) (value))
79 #define SetPixelMagenta(pixel,value) ((pixel)->green=(Quantum) (value))
80 #define SetPixelOpacity(pixel,value) \
81  ((pixel)->opacity=(Quantum) (value))
82 #define SetPixelRed(pixel,value) ((pixel)->red=(Quantum) (value))
83 #define SetPixelRgb(pixel,packet) \
84 { \
85  SetPixelRed(pixel,(packet)->red); \
86  SetPixelGreen(pixel,(packet)->green); \
87  SetPixelBlue(pixel,(packet)->blue); \
88 }
89 #define SetPixelRGBA(pixel,packet) \
90 { \
91  SetPixelRed(pixel,(packet)->red); \
92  SetPixelGreen(pixel,(packet)->green); \
93  SetPixelBlue(pixel,(packet)->blue); \
94  SetPixelAlpha(pixel,(QuantumRange-(packet)->opacity)); \
95 }
96 #define SetPixelRGBO(pixel,packet) \
97 { \
98  SetPixelRed(pixel,(packet)->red); \
99  SetPixelGreen(pixel,(packet)->green); \
100  SetPixelBlue(pixel,(packet)->blue); \
101  SetPixelOpacity(pixel,(packet)->opacity); \
102 }
103 #define SetPixelYellow(pixel,value) ((pixel)->blue=(Quantum) (value))
104 #define SetPixelY(pixel,value) ((pixel)->red=(Quantum) (value))
105 
107 {
108  return(x < 0.0f ? -x : x);
109 }
110 
111 static inline MagickRealType GetPixelLuma(const Image *restrict image,
112  const PixelPacket *restrict pixel)
113 {
114  if (image->colorspace == GRAYColorspace)
115  return((MagickRealType) pixel->red);
116  return(0.21267f*pixel->red+0.71516f*pixel->green+0.07217f*pixel->blue);
117 }
118 
119 static inline MagickRealType GetPixelLuminance(const Image *restrict image,
120  const PixelPacket *restrict pixel)
121 {
123  blue,
124  green,
125  red;
126 
127  if (image->colorspace == GRAYColorspace)
128  return((MagickRealType) pixel->red);
129  if (image->colorspace != sRGBColorspace)
130  return(0.21267f*pixel->red+0.71516f*pixel->green+0.07217f*pixel->blue);
131  red=DecodePixelGamma((MagickRealType) pixel->red);
132  green=DecodePixelGamma((MagickRealType) pixel->green);
133  blue=DecodePixelGamma((MagickRealType) pixel->blue);
134  return(0.21267f*red+0.71516f*green+0.07217f*blue);
135 }
136 
137 static inline MagickBooleanType IsPixelGray(const PixelPacket *pixel)
138 {
140  blue,
141  green,
142  red;
143 
144  red=(MagickRealType) pixel->red;
145  green=(MagickRealType) pixel->green;
146  blue=(MagickRealType) pixel->blue;
147  if ((AbsolutePixelValue(red-green) < MagickEpsilon) &&
148  (AbsolutePixelValue(green-blue) < MagickEpsilon))
149  return(MagickTrue);
150  return(MagickFalse);
151 }
152 
153 static inline Quantum PixelPacketIntensity(const PixelPacket *pixel)
154 {
156  blue,
157  green,
158  red;
159 
160  red=DecodePixelGamma((MagickRealType) pixel->red);
161  green=DecodePixelGamma((MagickRealType) pixel->green);
162  blue=DecodePixelGamma((MagickRealType) pixel->blue);
163  return(ClampToQuantum(0.298839*red+0.586811*green+0.114350*blue));
164 }
165 
166 #if defined(__cplusplus) || defined(c_plusplus)
167 }
168 #endif
169 
170 #endif