MagickCore  6.9.12-67
Convert, Edit, Or Compose Bitmap Images
 All Data Structures
pixel-accessor.h
1 /*
2  Copyright 1999-2021 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 pixel accessor methods.
17 */
18 #ifndef MAGICKCORE_PIXEL_ACCESSOR_H
19 #define MAGICKCORE_PIXEL_ACCESSOR_H
20 
21 #include <math.h>
22 #include "magick/gem.h"
23 #include "magick/pixel.h"
24 
25 #if defined(__cplusplus) || defined(c_plusplus)
26 extern "C" {
27 #endif
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 GetPixelLabel(pixel) ((ssize_t) (pixel)->red)
47 #define GetPixelMagenta(pixel) ((pixel)->green)
48 #define GetPixelNext(pixel) ((pixel)+1)
49 #define GetPixelOpacity(pixel) ((pixel)->opacity)
50 #define GetPixelRed(pixel) ((pixel)->red)
51 #define GetPixelRGB(pixel,packet) \
52 { \
53  (packet)->red=GetPixelRed((pixel)); \
54  (packet)->green=GetPixelGreen((pixel)); \
55  (packet)->blue=GetPixelBlue((pixel)); \
56 }
57 #define GetPixelRGBO(pixel,packet) \
58 { \
59  (packet)->red=GetPixelRed((pixel)); \
60  (packet)->green=GetPixelGreen((pixel)); \
61  (packet)->blue=GetPixelBlue((pixel)); \
62  (packet)->opacity=GetPixelOpacity((pixel)); \
63 }
64 #define GetPixelY(pixel) ((pixel)->red)
65 #define GetPixelYellow(pixel) ((pixel)->blue)
66 #define SetPixela(pixel,value) ((pixel)->green=(Quantum) (value))
67 #define SetPixelAlpha(pixel,value) \
68  ((pixel)->opacity=(Quantum) (QuantumRange-(value)))
69 #define SetPixelb(pixel,value) ((pixel)->blue=(Quantum) (value))
70 #define SetPixelBlack(indexes,value) (*(indexes)=(Quantum) (value))
71 #define SetPixelBlue(pixel,value) ((pixel)->blue=(Quantum) (value))
72 #define SetPixelCb(pixel,value) ((pixel)->green=(Quantum) (value))
73 #define SetPixelCr(pixel,value) ((pixel)->blue=(Quantum) (value))
74 #define SetPixelCyan(pixel,value) ((pixel)->red=(Quantum) (value))
75 #define SetPixelGray(pixel,value) \
76  ((pixel)->red=(pixel)->green=(pixel)->blue=(Quantum) (value))
77 #define SetPixelGreen(pixel,value) ((pixel)->green=(Quantum) (value))
78 #define SetPixelIndex(indexes,value) (*(indexes)=(IndexPacket) (value))
79 #define SetPixelL(pixel,value) ((pixel)->red=(Quantum) (value))
80 #define SetPixelMagenta(pixel,value) ((pixel)->green=(Quantum) (value))
81 #define SetPixelOpacity(pixel,value) ((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 
106 static inline MagickRealType AbsolutePixelValue(const MagickRealType x)
107 {
108  return(x < 0.0f ? -x : x);
109 }
110 
111 static inline Quantum ClampPixel(const MagickRealType value)
112 {
113  if (value < 0.0f)
114  return((Quantum) 0);
115  if (value >= (MagickRealType) QuantumRange)
116  return((Quantum) QuantumRange);
117 #if !defined(MAGICKCORE_HDRI_SUPPORT)
118  return((Quantum) (value+0.5f));
119 #else
120  return((Quantum) value);
121 #endif
122 }
123 
124 static inline double PerceptibleReciprocal(const double x)
125 {
126  double
127  sign;
128 
129  /*
130  Return 1/x where x is perceptible (not unlimited or infinitesimal).
131  */
132  sign=x < 0.0 ? -1.0 : 1.0;
133  if ((sign*x) >= MagickEpsilon)
134  return(1.0/x);
135  return(sign/MagickEpsilon);
136 }
137 
138 static inline MagickRealType GetPixelLuma(
139  const Image *magick_restrict image,const PixelPacket *magick_restrict pixel)
140 {
141  MagickRealType
142  intensity;
143 
144  (void) image;
145  intensity=(MagickRealType) (0.212656f*pixel->red+0.715158f*pixel->green+
146  0.072186f*pixel->blue);
147  return(intensity);
148 }
149 
150 static inline MagickRealType GetPixelLuminance(
151  const Image *magick_restrict image,const PixelPacket *magick_restrict pixel)
152 {
153  MagickRealType
154  intensity;
155 
156  if (image->colorspace != sRGBColorspace)
157  {
158  intensity=(MagickRealType) (0.212656f*pixel->red+0.715158f*pixel->green+
159  0.072186f*pixel->blue);
160  return(intensity);
161  }
162  intensity=(MagickRealType) (0.212656f*DecodePixelGamma((MagickRealType)
163  pixel->red)+0.715158f*DecodePixelGamma((MagickRealType) pixel->green)+
164  0.072186f*DecodePixelGamma((MagickRealType) pixel->blue));
165  return(intensity);
166 }
167 
168 static inline MagickBooleanType IsPixelAtDepth(const Quantum pixel,
169  const QuantumAny range)
170 {
171  Quantum
172  quantum;
173 
174  if (range == 0)
175  return(MagickTrue);
176 #if !defined(MAGICKCORE_HDRI_SUPPORT)
177  quantum=(Quantum) (((MagickRealType) QuantumRange*((QuantumAny)
178  (((MagickRealType) range*pixel)/QuantumRange+0.5)))/range+0.5);
179 #else
180  quantum=(Quantum) (((MagickRealType) QuantumRange*((QuantumAny)
181  (((MagickRealType) range*pixel)/QuantumRange+0.5)))/(MagickRealType) range);
182 #endif
183  return(pixel == quantum ? MagickTrue : MagickFalse);
184 }
185 
186 static inline MagickBooleanType IsPixelGray(const PixelPacket *pixel)
187 {
188  MagickRealType
189  green_blue,
190  red_green;
191 
192  red_green=(MagickRealType) pixel->red-pixel->green;
193  green_blue=(MagickRealType) pixel->green-pixel->blue;
194  if (((QuantumScale*AbsolutePixelValue(red_green)) < MagickEpsilon) &&
195  ((QuantumScale*AbsolutePixelValue(green_blue)) < MagickEpsilon))
196  return(MagickTrue);
197  return(MagickFalse);
198 }
199 
200 static inline MagickBooleanType IsPixelMonochrome(
201  const PixelPacket *pixel)
202 {
203  MagickRealType
204  green_blue,
205  red,
206  red_green;
207 
208  red=(MagickRealType) pixel->red;
209  if ((AbsolutePixelValue(red) >= MagickEpsilon) &&
210  (AbsolutePixelValue(red-QuantumRange) >= MagickEpsilon))
211  return(MagickFalse);
212  red_green=(MagickRealType) pixel->red-pixel->green;
213  green_blue=(MagickRealType) pixel->green-pixel->blue;
214  if (((QuantumScale*AbsolutePixelValue(red_green)) < MagickEpsilon) &&
215  ((QuantumScale*AbsolutePixelValue(green_blue)) < MagickEpsilon))
216  return(MagickTrue);
217  return(MagickFalse);
218 }
219 
220 static inline Quantum PixelPacketIntensity(const PixelPacket *pixel)
221 {
222  MagickRealType
223  intensity;
224 
225  if ((pixel->red == pixel->green) && (pixel->green == pixel->blue))
226  return(pixel->red);
227  intensity=(MagickRealType) (0.212656*pixel->red+0.715158*pixel->green+
228  0.072186*pixel->blue);
229  return(ClampToQuantum(intensity));
230 }
231 
232 static inline void SetPixelViaMagickPixel(const Image *magick_restrict image,
233  const MagickPixelPacket *magick_restrict magick_pixel,
234  PixelPacket *magick_restrict pixel)
235 {
236  pixel->red=ClampToQuantum(magick_pixel->red);
237  pixel->green=ClampToQuantum(magick_pixel->green);
238  pixel->blue=ClampToQuantum(magick_pixel->blue);
239  if (image->matte != MagickFalse)
240  pixel->opacity=ClampToQuantum(magick_pixel->opacity);
241 }
242 
243 #if defined(__cplusplus) || defined(c_plusplus)
244 }
245 #endif
246 
247 #endif
Definition: image.h:152