MagickCore  6.9.12-72
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 void GetPixelPacketRGBA(const Quantum red,const Quantum green,
169  const Quantum blue,const Quantum opacity,PixelPacket *magick_restrict pixel)
170 {
171  pixel->red=red;
172  pixel->green=green;
173  pixel->blue=blue;
174  pixel->opacity=opacity;
175 }
176 
177 static inline MagickBooleanType IsPixelAtDepth(const Quantum pixel,
178  const QuantumAny range)
179 {
180  Quantum
181  quantum;
182 
183  if (range == 0)
184  return(MagickTrue);
185 #if !defined(MAGICKCORE_HDRI_SUPPORT)
186  quantum=(Quantum) (((MagickRealType) QuantumRange*((QuantumAny)
187  (((MagickRealType) range*pixel)/QuantumRange+0.5)))/range+0.5);
188 #else
189  quantum=(Quantum) (((MagickRealType) QuantumRange*((QuantumAny)
190  (((MagickRealType) range*pixel)/QuantumRange+0.5)))/(MagickRealType) range);
191 #endif
192  return(pixel == quantum ? MagickTrue : MagickFalse);
193 }
194 
195 static inline MagickBooleanType IsPixelGray(const PixelPacket *pixel)
196 {
197  MagickRealType
198  green_blue,
199  red_green;
200 
201  red_green=(MagickRealType) pixel->red-pixel->green;
202  green_blue=(MagickRealType) pixel->green-pixel->blue;
203  if (((QuantumScale*AbsolutePixelValue(red_green)) < MagickEpsilon) &&
204  ((QuantumScale*AbsolutePixelValue(green_blue)) < MagickEpsilon))
205  return(MagickTrue);
206  return(MagickFalse);
207 }
208 
209 static inline MagickBooleanType IsPixelMonochrome(
210  const PixelPacket *pixel)
211 {
212  MagickRealType
213  green_blue,
214  red,
215  red_green;
216 
217  red=(MagickRealType) pixel->red;
218  if ((AbsolutePixelValue(red) >= MagickEpsilon) &&
219  (AbsolutePixelValue(red-QuantumRange) >= MagickEpsilon))
220  return(MagickFalse);
221  red_green=(MagickRealType) pixel->red-pixel->green;
222  green_blue=(MagickRealType) pixel->green-pixel->blue;
223  if (((QuantumScale*AbsolutePixelValue(red_green)) < MagickEpsilon) &&
224  ((QuantumScale*AbsolutePixelValue(green_blue)) < MagickEpsilon))
225  return(MagickTrue);
226  return(MagickFalse);
227 }
228 
229 static inline Quantum PixelPacketIntensity(const PixelPacket *pixel)
230 {
231  MagickRealType
232  intensity;
233 
234  if ((pixel->red == pixel->green) && (pixel->green == pixel->blue))
235  return(pixel->red);
236  intensity=(MagickRealType) (0.212656*pixel->red+0.715158*pixel->green+
237  0.072186*pixel->blue);
238  return(ClampToQuantum(intensity));
239 }
240 
241 static inline void SetPixelViaMagickPixel(const Image *magick_restrict image,
242  const MagickPixelPacket *magick_restrict magick_pixel,
243  PixelPacket *magick_restrict pixel)
244 {
245  pixel->red=ClampToQuantum(magick_pixel->red);
246  pixel->green=ClampToQuantum(magick_pixel->green);
247  pixel->blue=ClampToQuantum(magick_pixel->blue);
248  if (image->matte != MagickFalse)
249  pixel->opacity=ClampToQuantum(magick_pixel->opacity);
250 }
251 
252 #if defined(__cplusplus) || defined(c_plusplus)
253 }
254 #endif
255 
256 #endif
Definition: image.h:152