MagickCore  6.9.12-43
Convert, Edit, Or Compose Bitmap Images
pixel-accessor.h
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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 
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 
139  const PixelPacket *magick_restrict pixel)
140 {
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 
151  const Image *magick_restrict image,const PixelPacket *magick_restrict pixel)
152 {
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)
178  (((MagickRealType) range*pixel)/QuantumRange+0.5)))/range+0.5);
179 #else
181  (((MagickRealType) range*pixel)/QuantumRange+0.5)))/range);
182 #endif
183  return(pixel == quantum ? MagickTrue : MagickFalse);
184 }
185 
186 static inline MagickBooleanType IsPixelGray(const PixelPacket *pixel)
187 {
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) &&
196  return(MagickTrue);
197  return(MagickFalse);
198 }
199 
201 {
203  green_blue,
204  red,
205  red_green;
206 
207  red=(MagickRealType) pixel->red;
208  if ((AbsolutePixelValue(red) >= MagickEpsilon) &&
210  return(MagickFalse);
211  red_green=(MagickRealType) pixel->red-pixel->green;
212  green_blue=(MagickRealType) pixel->green-pixel->blue;
213  if (((QuantumScale*AbsolutePixelValue(red_green)) < MagickEpsilon) &&
215  return(MagickTrue);
216  return(MagickFalse);
217 }
218 
219 static inline Quantum PixelPacketIntensity(const PixelPacket *pixel)
220 {
222  intensity;
223 
224  if ((pixel->red == pixel->green) && (pixel->green == pixel->blue))
225  return(pixel->red);
226  intensity=(MagickRealType) (0.212656*pixel->red+0.715158*pixel->green+
227  0.072186*pixel->blue);
228  return(ClampToQuantum(intensity));
229 }
230 
231 static inline void SetPixelViaMagickPixel(const Image *magick_restrict image,
232  const MagickPixelPacket *magick_restrict magick_pixel,
234 {
235  pixel->red=ClampToQuantum(magick_pixel->red);
236  pixel->green=ClampToQuantum(magick_pixel->green);
237  pixel->blue=ClampToQuantum(magick_pixel->blue);
238  if (image->matte != MagickFalse)
239  pixel->opacity=ClampToQuantum(magick_pixel->opacity);
240 }
241 
242 #if defined(__cplusplus) || defined(c_plusplus)
243 }
244 #endif
245 
246 #endif
#define magick_restrict
Definition: MagickCore.h:41
MagickDoubleType MagickRealType
Definition: magick-type.h:125
static MagickRealType GetPixelLuma(const Image *magick_restrict image, const PixelPacket *magick_restrict pixel)
Definition: pixel-accessor.h:138
Definition: colorspace.h:40
Quantum blue
Definition: pixel.h:143
static MagickRealType GetPixelLuminance(const Image *magick_restrict image, const PixelPacket *magick_restrict pixel)
Definition: pixel-accessor.h:150
static MagickRealType AbsolutePixelValue(const MagickRealType x)
Definition: pixel-accessor.h:106
Definition: pixel.h:131
Quantum green
Definition: pixel.h:143
#define MagickEpsilon
Definition: magick-type.h:115
static Quantum ClampToQuantum(const MagickRealType quantum)
Definition: quantum.h:88
Definition: image.h:152
MagickExport MagickRealType DecodePixelGamma(const MagickRealType pixel)
Definition: pixel.c:246
static void SetPixelViaMagickPixel(const Image *magick_restrict image, const MagickPixelPacket *magick_restrict magick_pixel, PixelPacket *magick_restrict pixel)
Definition: pixel-accessor.h:231
MagickBooleanType
Definition: magick-type.h:198
static double PerceptibleReciprocal(const double x)
Definition: pixel-accessor.h:124
Quantum red
Definition: pixel.h:143
Definition: pixel.h:104
static MagickBooleanType IsPixelAtDepth(const Quantum pixel, const QuantumAny range)
Definition: pixel-accessor.h:168
static Quantum ClampPixel(const MagickRealType value)
Definition: pixel-accessor.h:111
Definition: magick-type.h:201
#define QuantumScale
Definition: magick-type.h:120
static Quantum PixelPacketIntensity(const PixelPacket *pixel)
Definition: pixel-accessor.h:219
static MagickBooleanType IsPixelGray(const PixelPacket *pixel)
Definition: pixel-accessor.h:186
Definition: magick-type.h:200
unsigned short Quantum
Definition: magick-type.h:85
static MagickBooleanType IsPixelMonochrome(const PixelPacket *pixel)
Definition: pixel-accessor.h:200
MagickSizeType QuantumAny
Definition: magick-type.h:157
#define QuantumRange
Definition: magick-type.h:86