2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
6 % DDDD IIIII SSSSS TTTTT OOO RRRR TTTTT %
7 % D D I SS T O O R R T %
8 % D D I SSS T O O RRRR T %
9 % D D I SS T O O R R T %
10 % DDDD IIIII SSSSS T OOO R R T %
13 % MagickCore Image Distortion Methods %
21 % Copyright 1999-2015 ImageMagick Studio LLC, a non-profit organization %
22 % dedicated to making software imaging solutions freely available. %
24 % You may not use this file except in compliance with the License. You may %
25 % obtain a copy of the License at %
27 % http://www.imagemagick.org/script/license.php %
29 % Unless required by applicable law or agreed to in writing, software %
30 % distributed under the License is distributed on an "AS IS" BASIS, %
31 % WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
32 % See the License for the specific language governing permissions and %
33 % limitations under the License. %
35 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
43 #include "MagickCore/studio.h"
44 #include "MagickCore/artifact.h"
45 #include "MagickCore/cache.h"
46 #include "MagickCore/cache-view.h"
47 #include "MagickCore/channel.h"
48 #include "MagickCore/colorspace-private.h"
49 #include "MagickCore/composite-private.h"
50 #include "MagickCore/distort.h"
51 #include "MagickCore/exception.h"
52 #include "MagickCore/exception-private.h"
53 #include "MagickCore/gem.h"
54 #include "MagickCore/hashmap.h"
55 #include "MagickCore/image.h"
56 #include "MagickCore/list.h"
57 #include "MagickCore/matrix.h"
58 #include "MagickCore/matrix-private.h"
59 #include "MagickCore/memory_.h"
60 #include "MagickCore/monitor-private.h"
61 #include "MagickCore/option.h"
62 #include "MagickCore/pixel.h"
63 #include "MagickCore/pixel-accessor.h"
64 #include "MagickCore/pixel-private.h"
65 #include "MagickCore/resample.h"
66 #include "MagickCore/resample-private.h"
67 #include "MagickCore/registry.h"
68 #include "MagickCore/resource_.h"
69 #include "MagickCore/semaphore.h"
70 #include "MagickCore/shear.h"
71 #include "MagickCore/string_.h"
72 #include "MagickCore/string-private.h"
73 #include "MagickCore/thread-private.h"
74 #include "MagickCore/token.h"
75 #include "MagickCore/transform.h"
78 Numerous internal routines for image distortions.
80 static inline void AffineArgsToCoefficients(double *affine)
82 /* map external sx,ry,rx,sy,tx,ty to internal c0,c2,c4,c1,c3,c5 */
83 double tmp[4]; /* note indexes 0 and 5 remain unchanged */
84 tmp[0]=affine[1]; tmp[1]=affine[2]; tmp[2]=affine[3]; tmp[3]=affine[4];
85 affine[3]=tmp[0]; affine[1]=tmp[1]; affine[4]=tmp[2]; affine[2]=tmp[3];
88 static inline void CoefficientsToAffineArgs(double *coeff)
90 /* map internal c0,c1,c2,c3,c4,c5 to external sx,ry,rx,sy,tx,ty */
91 double tmp[4]; /* note indexes 0 and 5 remain unchanged */
92 tmp[0]=coeff[3]; tmp[1]=coeff[1]; tmp[2]=coeff[4]; tmp[3]=coeff[2];
93 coeff[1]=tmp[0]; coeff[2]=tmp[1]; coeff[3]=tmp[2]; coeff[4]=tmp[3];
95 static void InvertAffineCoefficients(const double *coeff,double *inverse)
97 /* From "Digital Image Warping" by George Wolberg, page 50 */
100 determinant=PerceptibleReciprocal(coeff[0]*coeff[4]-coeff[1]*coeff[3]);
101 inverse[0]=determinant*coeff[4];
102 inverse[1]=determinant*(-coeff[1]);
103 inverse[2]=determinant*(coeff[1]*coeff[5]-coeff[2]*coeff[4]);
104 inverse[3]=determinant*(-coeff[3]);
105 inverse[4]=determinant*coeff[0];
106 inverse[5]=determinant*(coeff[2]*coeff[3]-coeff[0]*coeff[5]);
109 static void InvertPerspectiveCoefficients(const double *coeff,
112 /* From "Digital Image Warping" by George Wolberg, page 53 */
115 determinant=PerceptibleReciprocal(coeff[0]*coeff[4]-coeff[3]*coeff[1]);
116 inverse[0]=determinant*(coeff[4]-coeff[7]*coeff[5]);
117 inverse[1]=determinant*(coeff[7]*coeff[2]-coeff[1]);
118 inverse[2]=determinant*(coeff[1]*coeff[5]-coeff[4]*coeff[2]);
119 inverse[3]=determinant*(coeff[6]*coeff[5]-coeff[3]);
120 inverse[4]=determinant*(coeff[0]-coeff[6]*coeff[2]);
121 inverse[5]=determinant*(coeff[3]*coeff[2]-coeff[0]*coeff[5]);
122 inverse[6]=determinant*(coeff[3]*coeff[7]-coeff[6]*coeff[4]);
123 inverse[7]=determinant*(coeff[6]*coeff[1]-coeff[0]*coeff[7]);
127 * Polynomial Term Defining Functions
129 * Order must either be an integer, or 1.5 to produce
130 * the 2 number_valuesal polynomial function...
131 * affine 1 (3) u = c0 + c1*x + c2*y
132 * bilinear 1.5 (4) u = '' + c3*x*y
133 * quadratic 2 (6) u = '' + c4*x*x + c5*y*y
134 * cubic 3 (10) u = '' + c6*x^3 + c7*x*x*y + c8*x*y*y + c9*y^3
135 * quartic 4 (15) u = '' + c10*x^4 + ... + c14*y^4
136 * quintic 5 (21) u = '' + c15*x^5 + ... + c20*y^5
137 * number in parenthesis minimum number of points needed.
138 * Anything beyond quintic, has not been implemented until
139 * a more automated way of determining terms is found.
141 * Note the slight re-ordering of the terms for a quadratic polynomial
142 * which is to allow the use of a bi-linear (order=1.5) polynomial.
143 * All the later polynomials are ordered simply from x^N to y^N
145 static size_t poly_number_terms(double order)
147 /* Return the number of terms for a 2d polynomial */
148 if ( order < 1 || order > 5 ||
149 ( order != floor(order) && (order-1.5) > MagickEpsilon) )
150 return 0; /* invalid polynomial order */
151 return((size_t) floor((order+1)*(order+2)/2));
154 static double poly_basis_fn(ssize_t n, double x, double y)
156 /* Return the result for this polynomial term */
158 case 0: return( 1.0 ); /* constant */
160 case 2: return( y ); /* affine order = 1 terms = 3 */
161 case 3: return( x*y ); /* bilinear order = 1.5 terms = 4 */
162 case 4: return( x*x );
163 case 5: return( y*y ); /* quadratic order = 2 terms = 6 */
164 case 6: return( x*x*x );
165 case 7: return( x*x*y );
166 case 8: return( x*y*y );
167 case 9: return( y*y*y ); /* cubic order = 3 terms = 10 */
168 case 10: return( x*x*x*x );
169 case 11: return( x*x*x*y );
170 case 12: return( x*x*y*y );
171 case 13: return( x*y*y*y );
172 case 14: return( y*y*y*y ); /* quartic order = 4 terms = 15 */
173 case 15: return( x*x*x*x*x );
174 case 16: return( x*x*x*x*y );
175 case 17: return( x*x*x*y*y );
176 case 18: return( x*x*y*y*y );
177 case 19: return( x*y*y*y*y );
178 case 20: return( y*y*y*y*y ); /* quintic order = 5 terms = 21 */
180 return( 0 ); /* should never happen */
182 static const char *poly_basis_str(ssize_t n)
184 /* return the result for this polynomial term */
186 case 0: return(""); /* constant */
187 case 1: return("*ii");
188 case 2: return("*jj"); /* affine order = 1 terms = 3 */
189 case 3: return("*ii*jj"); /* bilinear order = 1.5 terms = 4 */
190 case 4: return("*ii*ii");
191 case 5: return("*jj*jj"); /* quadratic order = 2 terms = 6 */
192 case 6: return("*ii*ii*ii");
193 case 7: return("*ii*ii*jj");
194 case 8: return("*ii*jj*jj");
195 case 9: return("*jj*jj*jj"); /* cubic order = 3 terms = 10 */
196 case 10: return("*ii*ii*ii*ii");
197 case 11: return("*ii*ii*ii*jj");
198 case 12: return("*ii*ii*jj*jj");
199 case 13: return("*ii*jj*jj*jj");
200 case 14: return("*jj*jj*jj*jj"); /* quartic order = 4 terms = 15 */
201 case 15: return("*ii*ii*ii*ii*ii");
202 case 16: return("*ii*ii*ii*ii*jj");
203 case 17: return("*ii*ii*ii*jj*jj");
204 case 18: return("*ii*ii*jj*jj*jj");
205 case 19: return("*ii*jj*jj*jj*jj");
206 case 20: return("*jj*jj*jj*jj*jj"); /* quintic order = 5 terms = 21 */
208 return( "UNKNOWN" ); /* should never happen */
210 static double poly_basis_dx(ssize_t n, double x, double y)
212 /* polynomial term for x derivative */
214 case 0: return( 0.0 ); /* constant */
215 case 1: return( 1.0 );
216 case 2: return( 0.0 ); /* affine order = 1 terms = 3 */
217 case 3: return( y ); /* bilinear order = 1.5 terms = 4 */
219 case 5: return( 0.0 ); /* quadratic order = 2 terms = 6 */
220 case 6: return( x*x );
221 case 7: return( x*y );
222 case 8: return( y*y );
223 case 9: return( 0.0 ); /* cubic order = 3 terms = 10 */
224 case 10: return( x*x*x );
225 case 11: return( x*x*y );
226 case 12: return( x*y*y );
227 case 13: return( y*y*y );
228 case 14: return( 0.0 ); /* quartic order = 4 terms = 15 */
229 case 15: return( x*x*x*x );
230 case 16: return( x*x*x*y );
231 case 17: return( x*x*y*y );
232 case 18: return( x*y*y*y );
233 case 19: return( y*y*y*y );
234 case 20: return( 0.0 ); /* quintic order = 5 terms = 21 */
236 return( 0.0 ); /* should never happen */
238 static double poly_basis_dy(ssize_t n, double x, double y)
240 /* polynomial term for y derivative */
242 case 0: return( 0.0 ); /* constant */
243 case 1: return( 0.0 );
244 case 2: return( 1.0 ); /* affine order = 1 terms = 3 */
245 case 3: return( x ); /* bilinear order = 1.5 terms = 4 */
246 case 4: return( 0.0 );
247 case 5: return( y ); /* quadratic order = 2 terms = 6 */
248 default: return( poly_basis_dx(n-1,x,y) ); /* weird but true */
250 /* NOTE: the only reason that last is not true for 'quadratic'
251 is due to the re-arrangement of terms to allow for 'bilinear'
256 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
260 % A f f i n e T r a n s f o r m I m a g e %
264 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
266 % AffineTransformImage() transforms an image as dictated by the affine matrix.
267 % It allocates the memory necessary for the new Image structure and returns
268 % a pointer to the new image.
270 % The format of the AffineTransformImage method is:
272 % Image *AffineTransformImage(const Image *image,
273 % AffineMatrix *affine_matrix,ExceptionInfo *exception)
275 % A description of each parameter follows:
277 % o image: the image.
279 % o affine_matrix: the affine matrix.
281 % o exception: return any errors or warnings in this structure.
284 MagickExport Image *AffineTransformImage(const Image *image,
285 const AffineMatrix *affine_matrix,ExceptionInfo *exception)
294 Affine transform image.
296 assert(image->signature == MagickSignature);
297 if (image->debug != MagickFalse)
298 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
299 assert(affine_matrix != (AffineMatrix *) NULL);
300 assert(exception != (ExceptionInfo *) NULL);
301 assert(exception->signature == MagickSignature);
302 distort[0]=affine_matrix->sx;
303 distort[1]=affine_matrix->rx;
304 distort[2]=affine_matrix->ry;
305 distort[3]=affine_matrix->sy;
306 distort[4]=affine_matrix->tx;
307 distort[5]=affine_matrix->ty;
308 deskew_image=DistortImage(image,AffineProjectionDistortion,6,distort,
309 MagickTrue,exception);
310 return(deskew_image);
314 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
318 + G e n e r a t e C o e f f i c i e n t s %
322 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
324 % GenerateCoefficients() takes user provided input arguments and generates
325 % the coefficients, needed to apply the specific distortion for either
326 % distorting images (generally using control points) or generating a color
327 % gradient from sparsely separated color points.
329 % The format of the GenerateCoefficients() method is:
331 % Image *GenerateCoefficients(const Image *image,DistortImageMethod method,
332 % const size_t number_arguments,const double *arguments,
333 % size_t number_values, ExceptionInfo *exception)
335 % A description of each parameter follows:
337 % o image: the image to be distorted.
339 % o method: the method of image distortion/ sparse gradient
341 % o number_arguments: the number of arguments given.
343 % o arguments: the arguments for this distortion method.
345 % o number_values: the style and format of given control points, (caller type)
346 % 0: 2 dimensional mapping of control points (Distort)
347 % Format: u,v,x,y where u,v is the 'source' of the
348 % the color to be plotted, for DistortImage()
349 % N: Interpolation of control points with N values (usally r,g,b)
350 % Format: x,y,r,g,b mapping x,y to color values r,g,b
351 % IN future, variable number of values may be given (1 to N)
353 % o exception: return any errors or warnings in this structure
355 % Note that the returned array of double values must be freed by the
356 % calling method using RelinquishMagickMemory(). This however may change in
357 % the future to require a more 'method' specific method.
359 % Because of this this method should not be classed as stable or used
360 % outside other MagickCore library methods.
363 static inline double MagickRound(double x)
366 Round the fraction to nearest integer.
368 if ((x-floor(x)) < (ceil(x)-x))
373 static double *GenerateCoefficients(const Image *image,
374 DistortImageMethod *method,const size_t number_arguments,
375 const double *arguments,size_t number_values,ExceptionInfo *exception)
384 number_coeff, /* number of coefficients to return (array size) */
385 cp_size, /* number floating point numbers per control point */
386 cp_x,cp_y, /* the x,y indexes for control point */
387 cp_values; /* index of values for this control point */
388 /* number_values Number of values given per control point */
390 if ( number_values == 0 ) {
391 /* Image distortion using control points (or other distortion)
392 That is generate a mapping so that x,y->u,v given u,v,x,y
394 number_values = 2; /* special case: two values of u,v */
395 cp_values = 0; /* the values i,j are BEFORE the destination CP x,y */
396 cp_x = 2; /* location of x,y in input control values */
398 /* NOTE: cp_values, also used for later 'reverse map distort' tests */
401 cp_x = 0; /* location of x,y in input control values */
403 cp_values = 2; /* and the other values are after x,y */
404 /* Typically in this case the values are R,G,B color values */
406 cp_size = number_values+2; /* each CP defintion involves this many numbers */
408 /* If not enough control point pairs are found for specific distortions
409 fall back to Affine distortion (allowing 0 to 3 point pairs)
411 if ( number_arguments < 4*cp_size &&
412 ( *method == BilinearForwardDistortion
413 || *method == BilinearReverseDistortion
414 || *method == PerspectiveDistortion
416 *method = AffineDistortion;
420 case AffineDistortion:
421 /* also BarycentricColorInterpolate: */
422 number_coeff=3*number_values;
424 case PolynomialDistortion:
425 /* number of coefficents depend on the given polynomal 'order' */
426 i = poly_number_terms(arguments[0]);
427 number_coeff = 2 + i*number_values;
429 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
430 "InvalidArgument","%s : '%s'","Polynomial",
431 "Invalid order, should be interger 1 to 5, or 1.5");
432 return((double *) NULL);
434 if ( number_arguments < 1+i*cp_size ) {
435 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
436 "InvalidArgument", "%s : 'require at least %.20g CPs'",
437 "Polynomial", (double) i);
438 return((double *) NULL);
441 case BilinearReverseDistortion:
442 number_coeff=4*number_values;
445 The rest are constants as they are only used for image distorts
447 case BilinearForwardDistortion:
448 number_coeff=10; /* 2*4 coeff plus 2 constants */
449 cp_x = 0; /* Reverse src/dest coords for forward mapping */
454 case QuadraterialDistortion:
455 number_coeff=19; /* BilinearForward + BilinearReverse */
458 case ShepardsDistortion:
459 number_coeff=1; /* The power factor to use */
464 case ScaleRotateTranslateDistortion:
465 case AffineProjectionDistortion:
466 case Plane2CylinderDistortion:
467 case Cylinder2PlaneDistortion:
470 case PolarDistortion:
471 case DePolarDistortion:
474 case PerspectiveDistortion:
475 case PerspectiveProjectionDistortion:
478 case BarrelDistortion:
479 case BarrelInverseDistortion:
483 perror("unknown method given"); /* just fail assertion */
486 /* allocate the array of coefficients needed */
487 coeff = (double *) AcquireQuantumMemory(number_coeff,sizeof(*coeff));
488 if (coeff == (double *) NULL) {
489 (void) ThrowMagickException(exception,GetMagickModule(),
490 ResourceLimitError,"MemoryAllocationFailed",
491 "%s", "GenerateCoefficients");
492 return((double *) NULL);
495 /* zero out coefficients array */
496 for (i=0; i < number_coeff; i++)
501 case AffineDistortion:
505 for each 'value' given
507 Input Arguments are sets of control points...
508 For Distort Images u,v, x,y ...
509 For Sparse Gradients x,y, r,g,b ...
511 if ( number_arguments%cp_size != 0 ||
512 number_arguments < cp_size ) {
513 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
514 "InvalidArgument", "%s : 'require at least %.20g CPs'",
516 coeff=(double *) RelinquishMagickMemory(coeff);
517 return((double *) NULL);
519 /* handle special cases of not enough arguments */
520 if ( number_arguments == cp_size ) {
521 /* Only 1 CP Set Given */
522 if ( cp_values == 0 ) {
523 /* image distortion - translate the image */
525 coeff[2] = arguments[0] - arguments[2];
527 coeff[5] = arguments[1] - arguments[3];
530 /* sparse gradient - use the values directly */
531 for (i=0; i<number_values; i++)
532 coeff[i*3+2] = arguments[cp_values+i];
536 /* 2 or more points (usally 3) given.
537 Solve a least squares simultaneous equation for coefficients.
547 /* create matrix, and a fake vectors matrix */
548 matrix = AcquireMagickMatrix(3UL,3UL);
549 vectors = (double **) AcquireQuantumMemory(number_values,sizeof(*vectors));
550 if (matrix == (double **) NULL || vectors == (double **) NULL)
552 matrix = RelinquishMagickMatrix(matrix, 3UL);
553 vectors = (double **) RelinquishMagickMemory(vectors);
554 coeff = (double *) RelinquishMagickMemory(coeff);
555 (void) ThrowMagickException(exception,GetMagickModule(),
556 ResourceLimitError,"MemoryAllocationFailed",
557 "%s", "DistortCoefficients");
558 return((double *) NULL);
560 /* fake a number_values x3 vectors matrix from coefficients array */
561 for (i=0; i < number_values; i++)
562 vectors[i] = &(coeff[i*3]);
563 /* Add given control point pairs for least squares solving */
564 for (i=0; i < number_arguments; i+=cp_size) {
565 terms[0] = arguments[i+cp_x]; /* x */
566 terms[1] = arguments[i+cp_y]; /* y */
567 terms[2] = 1; /* 1 */
568 LeastSquaresAddTerms(matrix,vectors,terms,
569 &(arguments[i+cp_values]),3UL,number_values);
571 if ( number_arguments == 2*cp_size ) {
572 /* Only two pairs were given, but we need 3 to solve the affine.
573 Fake extra coordinates by rotating p1 around p0 by 90 degrees.
574 x2 = x0 - (y1-y0) y2 = y0 + (x1-x0)
576 terms[0] = arguments[cp_x]
577 - ( arguments[cp_size+cp_y] - arguments[cp_y] ); /* x2 */
578 terms[1] = arguments[cp_y] +
579 + ( arguments[cp_size+cp_x] - arguments[cp_x] ); /* y2 */
580 terms[2] = 1; /* 1 */
581 if ( cp_values == 0 ) {
582 /* Image Distortion - rotate the u,v coordients too */
585 uv2[0] = arguments[0] - arguments[5] + arguments[1]; /* u2 */
586 uv2[1] = arguments[1] + arguments[4] - arguments[0]; /* v2 */
587 LeastSquaresAddTerms(matrix,vectors,terms,uv2,3UL,2UL);
590 /* Sparse Gradient - use values of p0 for linear gradient */
591 LeastSquaresAddTerms(matrix,vectors,terms,
592 &(arguments[cp_values]),3UL,number_values);
595 /* Solve for LeastSquares Coefficients */
596 status=GaussJordanElimination(matrix,vectors,3UL,number_values);
597 matrix = RelinquishMagickMatrix(matrix, 3UL);
598 vectors = (double **) RelinquishMagickMemory(vectors);
599 if ( status == MagickFalse ) {
600 coeff = (double *) RelinquishMagickMemory(coeff);
601 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
602 "InvalidArgument","%s : 'Unsolvable Matrix'",
603 CommandOptionToMnemonic(MagickDistortOptions, *method) );
604 return((double *) NULL);
609 case AffineProjectionDistortion:
612 Arguments: Affine Matrix (forward mapping)
613 Arguments sx, rx, ry, sy, tx, ty
614 Where u = sx*x + ry*y + tx
617 Returns coefficients (in there inverse form) ordered as...
620 AffineProjection Distortion Notes...
621 + Will only work with a 2 number_values for Image Distortion
622 + Can not be used for generating a sparse gradient (interpolation)
625 if (number_arguments != 6) {
626 coeff = (double *) RelinquishMagickMemory(coeff);
627 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
628 "InvalidArgument","%s : 'Needs 6 coeff values'",
629 CommandOptionToMnemonic(MagickDistortOptions, *method) );
630 return((double *) NULL);
632 /* FUTURE: trap test for sx*sy-rx*ry == 0 (determinant = 0, no inverse) */
633 for(i=0; i<6UL; i++ )
634 inverse[i] = arguments[i];
635 AffineArgsToCoefficients(inverse); /* map into coefficents */
636 InvertAffineCoefficients(inverse, coeff); /* invert */
637 *method = AffineDistortion;
641 case ScaleRotateTranslateDistortion:
643 /* Scale, Rotate and Translate Distortion
644 An alternative Affine Distortion
645 Argument options, by number of arguments given:
646 7: x,y, sx,sy, a, nx,ny
653 Where actions are (in order of application)
654 x,y 'center' of transforms (default = image center)
655 sx,sy scale image by this amount (default = 1)
656 a angle of rotation (argument required)
657 nx,ny move 'center' here (default = x,y or no movement)
658 And convert to affine mapping coefficients
660 ScaleRotateTranslate Distortion Notes...
661 + Does not use a set of CPs in any normal way
662 + Will only work with a 2 number_valuesal Image Distortion
663 + Cannot be used for generating a sparse gradient (interpolation)
669 /* set default center, and default scale */
670 x = nx = (double)(image->columns)/2.0 + (double)image->page.x;
671 y = ny = (double)(image->rows)/2.0 + (double)image->page.y;
673 switch ( number_arguments ) {
675 coeff = (double *) RelinquishMagickMemory(coeff);
676 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
677 "InvalidArgument","%s : 'Needs at least 1 argument'",
678 CommandOptionToMnemonic(MagickDistortOptions, *method) );
679 return((double *) NULL);
684 sx = sy = arguments[0];
688 x = nx = arguments[0];
689 y = ny = arguments[1];
690 switch ( number_arguments ) {
695 sx = sy = arguments[2];
704 sx = sy = arguments[2];
717 coeff = (double *) RelinquishMagickMemory(coeff);
718 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
719 "InvalidArgument","%s : 'Too Many Arguments (7 or less)'",
720 CommandOptionToMnemonic(MagickDistortOptions, *method) );
721 return((double *) NULL);
725 /* Trap if sx or sy == 0 -- image is scaled out of existance! */
726 if ( fabs(sx) < MagickEpsilon || fabs(sy) < MagickEpsilon ) {
727 coeff = (double *) RelinquishMagickMemory(coeff);
728 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
729 "InvalidArgument","%s : 'Zero Scale Given'",
730 CommandOptionToMnemonic(MagickDistortOptions, *method) );
731 return((double *) NULL);
733 /* Save the given arguments as an affine distortion */
734 a=DegreesToRadians(a); cosine=cos(a); sine=sin(a);
736 *method = AffineDistortion;
739 coeff[2]=x-nx*coeff[0]-ny*coeff[1];
742 coeff[5]=y-nx*coeff[3]-ny*coeff[4];
745 case PerspectiveDistortion:
747 Perspective Distortion (a ratio of affine distortions)
749 p(x,y) c0*x + c1*y + c2
750 u = ------ = ------------------
751 r(x,y) c6*x + c7*y + 1
753 q(x,y) c3*x + c4*y + c5
754 v = ------ = ------------------
755 r(x,y) c6*x + c7*y + 1
757 c8 = Sign of 'r', or the denominator affine, for the actual image.
758 This determines what part of the distorted image is 'ground'
759 side of the horizon, the other part is 'sky' or invalid.
760 Valid values are +1.0 or -1.0 only.
762 Input Arguments are sets of control points...
763 For Distort Images u,v, x,y ...
764 For Sparse Gradients x,y, r,g,b ...
766 Perspective Distortion Notes...
767 + Can be thought of as ratio of 3 affine transformations
768 + Not separatable: r() or c6 and c7 are used by both equations
769 + All 8 coefficients must be determined simultaniously
770 + Will only work with a 2 number_valuesal Image Distortion
771 + Can not be used for generating a sparse gradient (interpolation)
772 + It is not linear, but is simple to generate an inverse
773 + All lines within an image remain lines.
774 + but distances between points may vary.
788 if ( number_arguments%cp_size != 0 ||
789 number_arguments < cp_size*4 ) {
790 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
791 "InvalidArgument", "%s : 'require at least %.20g CPs'",
792 CommandOptionToMnemonic(MagickDistortOptions, *method), 4.0);
793 coeff=(double *) RelinquishMagickMemory(coeff);
794 return((double *) NULL);
796 /* fake 1x8 vectors matrix directly using the coefficients array */
797 vectors[0] = &(coeff[0]);
798 /* 8x8 least-squares matrix (zeroed) */
799 matrix = AcquireMagickMatrix(8UL,8UL);
800 if (matrix == (double **) NULL) {
801 (void) ThrowMagickException(exception,GetMagickModule(),
802 ResourceLimitError,"MemoryAllocationFailed",
803 "%s", "DistortCoefficients");
804 return((double *) NULL);
806 /* Add control points for least squares solving */
807 for (i=0; i < number_arguments; i+=4) {
808 terms[0]=arguments[i+cp_x]; /* c0*x */
809 terms[1]=arguments[i+cp_y]; /* c1*y */
810 terms[2]=1.0; /* c2*1 */
814 terms[6]=-terms[0]*arguments[i+cp_u]; /* 1/(c6*x) */
815 terms[7]=-terms[1]*arguments[i+cp_u]; /* 1/(c7*y) */
816 LeastSquaresAddTerms(matrix,vectors,terms,&(arguments[i+cp_u]),
822 terms[3]=arguments[i+cp_x]; /* c3*x */
823 terms[4]=arguments[i+cp_y]; /* c4*y */
824 terms[5]=1.0; /* c5*1 */
825 terms[6]=-terms[3]*arguments[i+cp_v]; /* 1/(c6*x) */
826 terms[7]=-terms[4]*arguments[i+cp_v]; /* 1/(c7*y) */
827 LeastSquaresAddTerms(matrix,vectors,terms,&(arguments[i+cp_v]),
830 /* Solve for LeastSquares Coefficients */
831 status=GaussJordanElimination(matrix,vectors,8UL,1UL);
832 matrix = RelinquishMagickMatrix(matrix, 8UL);
833 if ( status == MagickFalse ) {
834 coeff = (double *) RelinquishMagickMemory(coeff);
835 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
836 "InvalidArgument","%s : 'Unsolvable Matrix'",
837 CommandOptionToMnemonic(MagickDistortOptions, *method) );
838 return((double *) NULL);
841 Calculate 9'th coefficient! The ground-sky determination.
842 What is sign of the 'ground' in r() denominator affine function?
843 Just use any valid image coordinate (first control point) in
844 destination for determination of what part of view is 'ground'.
846 coeff[8] = coeff[6]*arguments[cp_x]
847 + coeff[7]*arguments[cp_y] + 1.0;
848 coeff[8] = (coeff[8] < 0.0) ? -1.0 : +1.0;
852 case PerspectiveProjectionDistortion:
855 Arguments: Perspective Coefficents (forward mapping)
857 if (number_arguments != 8) {
858 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
859 "InvalidArgument", "%s : 'Needs 8 coefficient values'",
860 CommandOptionToMnemonic(MagickDistortOptions, *method));
861 return((double *) NULL);
863 /* FUTURE: trap test c0*c4-c3*c1 == 0 (determinate = 0, no inverse) */
864 InvertPerspectiveCoefficients(arguments, coeff);
866 Calculate 9'th coefficient! The ground-sky determination.
867 What is sign of the 'ground' in r() denominator affine function?
868 Just use any valid image cocodinate in destination for determination.
869 For a forward mapped perspective the images 0,0 coord will map to
870 c2,c5 in the distorted image, so set the sign of denominator of that.
872 coeff[8] = coeff[6]*arguments[2]
873 + coeff[7]*arguments[5] + 1.0;
874 coeff[8] = (coeff[8] < 0.0) ? -1.0 : +1.0;
875 *method = PerspectiveDistortion;
879 case BilinearForwardDistortion:
880 case BilinearReverseDistortion:
882 /* Bilinear Distortion (Forward mapping)
883 v = c0*x + c1*y + c2*x*y + c3;
884 for each 'value' given
886 This is actually a simple polynomial Distortion! The difference
887 however is when we need to reverse the above equation to generate a
888 BilinearForwardDistortion (see below).
890 Input Arguments are sets of control points...
891 For Distort Images u,v, x,y ...
892 For Sparse Gradients x,y, r,g,b ...
903 /* check the number of arguments */
904 if ( number_arguments%cp_size != 0 ||
905 number_arguments < cp_size*4 ) {
906 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
907 "InvalidArgument", "%s : 'require at least %.20g CPs'",
908 CommandOptionToMnemonic(MagickDistortOptions, *method), 4.0);
909 coeff=(double *) RelinquishMagickMemory(coeff);
910 return((double *) NULL);
912 /* create matrix, and a fake vectors matrix */
913 matrix = AcquireMagickMatrix(4UL,4UL);
914 vectors = (double **) AcquireQuantumMemory(number_values,sizeof(*vectors));
915 if (matrix == (double **) NULL || vectors == (double **) NULL)
917 matrix = RelinquishMagickMatrix(matrix, 4UL);
918 vectors = (double **) RelinquishMagickMemory(vectors);
919 coeff = (double *) RelinquishMagickMemory(coeff);
920 (void) ThrowMagickException(exception,GetMagickModule(),
921 ResourceLimitError,"MemoryAllocationFailed",
922 "%s", "DistortCoefficients");
923 return((double *) NULL);
925 /* fake a number_values x4 vectors matrix from coefficients array */
926 for (i=0; i < number_values; i++)
927 vectors[i] = &(coeff[i*4]);
928 /* Add given control point pairs for least squares solving */
929 for (i=0; i < number_arguments; i+=cp_size) {
930 terms[0] = arguments[i+cp_x]; /* x */
931 terms[1] = arguments[i+cp_y]; /* y */
932 terms[2] = terms[0]*terms[1]; /* x*y */
933 terms[3] = 1; /* 1 */
934 LeastSquaresAddTerms(matrix,vectors,terms,
935 &(arguments[i+cp_values]),4UL,number_values);
937 /* Solve for LeastSquares Coefficients */
938 status=GaussJordanElimination(matrix,vectors,4UL,number_values);
939 matrix = RelinquishMagickMatrix(matrix, 4UL);
940 vectors = (double **) RelinquishMagickMemory(vectors);
941 if ( status == MagickFalse ) {
942 coeff = (double *) RelinquishMagickMemory(coeff);
943 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
944 "InvalidArgument","%s : 'Unsolvable Matrix'",
945 CommandOptionToMnemonic(MagickDistortOptions, *method) );
946 return((double *) NULL);
948 if ( *method == BilinearForwardDistortion ) {
949 /* Bilinear Forward Mapped Distortion
951 The above least-squares solved for coefficents but in the forward
952 direction, due to changes to indexing constants.
954 i = c0*x + c1*y + c2*x*y + c3;
955 j = c4*x + c5*y + c6*x*y + c7;
957 where i,j are in the destination image, NOT the source.
959 Reverse Pixel mapping however needs to use reverse of these
960 functions. It required a full page of algbra to work out the
961 reversed mapping formula, but resolves down to the following...
964 c9 = 2*(c2*c5-c1*c6); // '2*a' in the quadratic formula
966 i = i - c3; j = j - c7;
967 b = c6*i - c2*j + c8; // So that a*y^2 + b*y + c == 0
968 c = c4*i - c0*j; // y = ( -b +- sqrt(bb - 4ac) ) / (2*a)
972 y = ( -b + sqrt(r) ) / c9;
976 x = ( i - c1*y) / ( c1 - c2*y );
978 NB: if 'r' is negative there is no solution!
979 NB: the sign of the sqrt() should be negative if image becomes
980 flipped or flopped, or crosses over itself.
981 NB: techniqually coefficient c5 is not needed, anymore,
982 but kept for completness.
984 See Anthony Thyssen <A.Thyssen@griffith.edu.au>
985 or Fred Weinhaus <fmw@alink.net> for more details.
988 coeff[8] = coeff[0]*coeff[5] - coeff[1]*coeff[4];
989 coeff[9] = 2*(coeff[2]*coeff[5] - coeff[1]*coeff[6]);
994 case QuadrilateralDistortion:
996 /* Map a Quadrilateral to a unit square using BilinearReverse
997 Then map that unit square back to the final Quadrilateral
998 using BilinearForward.
1000 Input Arguments are sets of control points...
1001 For Distort Images u,v, x,y ...
1002 For Sparse Gradients x,y, r,g,b ...
1005 /* UNDER CONSTRUCTION */
1010 case PolynomialDistortion:
1012 /* Polynomial Distortion
1014 First two coefficents are used to hole global polynomal information
1015 c0 = Order of the polynimial being created
1016 c1 = number_of_terms in one polynomial equation
1018 Rest of the coefficients map to the equations....
1019 v = c0 + c1*x + c2*y + c3*x*y + c4*x^2 + c5*y^2 + c6*x^3 + ...
1020 for each 'value' (number_values of them) given.
1021 As such total coefficients = 2 + number_terms * number_values
1023 Input Arguments are sets of control points...
1024 For Distort Images order [u,v, x,y] ...
1025 For Sparse Gradients order [x,y, r,g,b] ...
1027 Polynomial Distortion Notes...
1028 + UNDER DEVELOPMENT -- Do not expect this to remain as is.
1029 + Currently polynomial is a reversed mapped distortion.
1030 + Order 1.5 is fudged to map into a bilinear distortion.
1031 though it is not the same order as that distortion.
1039 nterms; /* number of polynomial terms per number_values */
1047 /* first two coefficients hold polynomial order information */
1048 coeff[0] = arguments[0];
1049 coeff[1] = (double) poly_number_terms(arguments[0]);
1050 nterms = (size_t) coeff[1];
1052 /* create matrix, a fake vectors matrix, and least sqs terms */
1053 matrix = AcquireMagickMatrix(nterms,nterms);
1054 vectors = (double **) AcquireQuantumMemory(number_values,sizeof(*vectors));
1055 terms = (double *) AcquireQuantumMemory(nterms, sizeof(*terms));
1056 if (matrix == (double **) NULL ||
1057 vectors == (double **) NULL ||
1058 terms == (double *) NULL )
1060 matrix = RelinquishMagickMatrix(matrix, nterms);
1061 vectors = (double **) RelinquishMagickMemory(vectors);
1062 terms = (double *) RelinquishMagickMemory(terms);
1063 coeff = (double *) RelinquishMagickMemory(coeff);
1064 (void) ThrowMagickException(exception,GetMagickModule(),
1065 ResourceLimitError,"MemoryAllocationFailed",
1066 "%s", "DistortCoefficients");
1067 return((double *) NULL);
1069 /* fake a number_values x3 vectors matrix from coefficients array */
1070 for (i=0; i < number_values; i++)
1071 vectors[i] = &(coeff[2+i*nterms]);
1072 /* Add given control point pairs for least squares solving */
1073 for (i=1; i < number_arguments; i+=cp_size) { /* NB: start = 1 not 0 */
1074 for (j=0; j < (ssize_t) nterms; j++)
1075 terms[j] = poly_basis_fn(j,arguments[i+cp_x],arguments[i+cp_y]);
1076 LeastSquaresAddTerms(matrix,vectors,terms,
1077 &(arguments[i+cp_values]),nterms,number_values);
1079 terms = (double *) RelinquishMagickMemory(terms);
1080 /* Solve for LeastSquares Coefficients */
1081 status=GaussJordanElimination(matrix,vectors,nterms,number_values);
1082 matrix = RelinquishMagickMatrix(matrix, nterms);
1083 vectors = (double **) RelinquishMagickMemory(vectors);
1084 if ( status == MagickFalse ) {
1085 coeff = (double *) RelinquishMagickMemory(coeff);
1086 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
1087 "InvalidArgument","%s : 'Unsolvable Matrix'",
1088 CommandOptionToMnemonic(MagickDistortOptions, *method) );
1089 return((double *) NULL);
1096 Args: arc_width rotate top_edge_radius bottom_edge_radius
1097 All but first argument are optional
1098 arc_width The angle over which to arc the image side-to-side
1099 rotate Angle to rotate image from vertical center
1100 top_radius Set top edge of source image at this radius
1101 bottom_radius Set bootom edge to this radius (radial scaling)
1103 By default, if the radii arguments are nor provided the image radius
1104 is calculated so the horizontal center-line is fits the given arc
1107 The output image size is ALWAYS adjusted to contain the whole image,
1108 and an offset is given to position image relative to the 0,0 point of
1109 the origin, allowing users to use relative positioning onto larger
1110 background (via -flatten).
1112 The arguments are converted to these coefficients
1113 c0: angle for center of source image
1114 c1: angle scale for mapping to source image
1115 c2: radius for top of source image
1116 c3: radius scale for mapping source image
1117 c4: centerline of arc within source image
1119 Note the coefficients use a center angle, so asymptotic join is
1120 furthest from both sides of the source image. This also means that
1121 for arc angles greater than 360 the sides of the image will be
1124 Arc Distortion Notes...
1125 + Does not use a set of CPs
1126 + Will only work with Image Distortion
1127 + Can not be used for generating a sparse gradient (interpolation)
1129 if ( number_arguments >= 1 && arguments[0] < MagickEpsilon ) {
1130 coeff = (double *) RelinquishMagickMemory(coeff);
1131 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
1132 "InvalidArgument","%s : 'Arc Angle Too Small'",
1133 CommandOptionToMnemonic(MagickDistortOptions, *method) );
1134 return((double *) NULL);
1136 if ( number_arguments >= 3 && arguments[2] < MagickEpsilon ) {
1137 coeff = (double *) RelinquishMagickMemory(coeff);
1138 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
1139 "InvalidArgument","%s : 'Outer Radius Too Small'",
1140 CommandOptionToMnemonic(MagickDistortOptions, *method) );
1141 return((double *) NULL);
1143 coeff[0] = -MagickPI2; /* -90, place at top! */
1144 if ( number_arguments >= 1 )
1145 coeff[1] = DegreesToRadians(arguments[0]);
1147 coeff[1] = MagickPI2; /* zero arguments - center is at top */
1148 if ( number_arguments >= 2 )
1149 coeff[0] += DegreesToRadians(arguments[1]);
1150 coeff[0] /= Magick2PI; /* normalize radians */
1151 coeff[0] -= MagickRound(coeff[0]);
1152 coeff[0] *= Magick2PI; /* de-normalize back to radians */
1153 coeff[3] = (double)image->rows-1;
1154 coeff[2] = (double)image->columns/coeff[1] + coeff[3]/2.0;
1155 if ( number_arguments >= 3 ) {
1156 if ( number_arguments >= 4 )
1157 coeff[3] = arguments[2] - arguments[3];
1159 coeff[3] *= arguments[2]/coeff[2];
1160 coeff[2] = arguments[2];
1162 coeff[4] = ((double)image->columns-1.0)/2.0;
1166 case PolarDistortion:
1167 case DePolarDistortion:
1169 /* (De)Polar Distortion (same set of arguments)
1170 Args: Rmax, Rmin, Xcenter,Ycenter, Afrom,Ato
1171 DePolar can also have the extra arguments of Width, Height
1173 Coefficients 0 to 5 is the sanatized version first 6 input args
1174 Coefficient 6 is the angle to coord ratio and visa-versa
1175 Coefficient 7 is the radius to coord ratio and visa-versa
1177 WARNING: It is possible for Radius max<min and/or Angle from>to
1179 if ( number_arguments == 3
1180 || ( number_arguments > 6 && *method == PolarDistortion )
1181 || number_arguments > 8 ) {
1182 (void) ThrowMagickException(exception,GetMagickModule(),
1183 OptionError,"InvalidArgument", "%s : number of arguments",
1184 CommandOptionToMnemonic(MagickDistortOptions, *method) );
1185 coeff=(double *) RelinquishMagickMemory(coeff);
1186 return((double *) NULL);
1188 /* Rmax - if 0 calculate appropriate value */
1189 if ( number_arguments >= 1 )
1190 coeff[0] = arguments[0];
1193 /* Rmin - usally 0 */
1194 coeff[1] = number_arguments >= 2 ? arguments[1] : 0.0;
1196 if ( number_arguments >= 4 ) {
1197 coeff[2] = arguments[2];
1198 coeff[3] = arguments[3];
1200 else { /* center of actual image */
1201 coeff[2] = (double)(image->columns)/2.0+image->page.x;
1202 coeff[3] = (double)(image->rows)/2.0+image->page.y;
1204 /* Angle from,to - about polar center 0 is downward */
1205 coeff[4] = -MagickPI;
1206 if ( number_arguments >= 5 )
1207 coeff[4] = DegreesToRadians(arguments[4]);
1208 coeff[5] = coeff[4];
1209 if ( number_arguments >= 6 )
1210 coeff[5] = DegreesToRadians(arguments[5]);
1211 if ( fabs(coeff[4]-coeff[5]) < MagickEpsilon )
1212 coeff[5] += Magick2PI; /* same angle is a full circle */
1213 /* if radius 0 or negative, its a special value... */
1214 if ( coeff[0] < MagickEpsilon ) {
1215 /* Use closest edge if radius == 0 */
1216 if ( fabs(coeff[0]) < MagickEpsilon ) {
1217 coeff[0]=MagickMin(fabs(coeff[2]-image->page.x),
1218 fabs(coeff[3]-image->page.y));
1219 coeff[0]=MagickMin(coeff[0],
1220 fabs(coeff[2]-image->page.x-image->columns));
1221 coeff[0]=MagickMin(coeff[0],
1222 fabs(coeff[3]-image->page.y-image->rows));
1224 /* furthest diagonal if radius == -1 */
1225 if ( fabs(-1.0-coeff[0]) < MagickEpsilon ) {
1227 rx = coeff[2]-image->page.x;
1228 ry = coeff[3]-image->page.y;
1229 coeff[0] = rx*rx+ry*ry;
1230 ry = coeff[3]-image->page.y-image->rows;
1231 coeff[0] = MagickMax(coeff[0],rx*rx+ry*ry);
1232 rx = coeff[2]-image->page.x-image->columns;
1233 coeff[0] = MagickMax(coeff[0],rx*rx+ry*ry);
1234 ry = coeff[3]-image->page.y;
1235 coeff[0] = MagickMax(coeff[0],rx*rx+ry*ry);
1236 coeff[0] = sqrt(coeff[0]);
1239 /* IF Rmax <= 0 or Rmin < 0 OR Rmax < Rmin, THEN error */
1240 if ( coeff[0] < MagickEpsilon || coeff[1] < -MagickEpsilon
1241 || (coeff[0]-coeff[1]) < MagickEpsilon ) {
1242 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
1243 "InvalidArgument", "%s : Invalid Radius",
1244 CommandOptionToMnemonic(MagickDistortOptions, *method) );
1245 coeff=(double *) RelinquishMagickMemory(coeff);
1246 return((double *) NULL);
1248 /* converstion ratios */
1249 if ( *method == PolarDistortion ) {
1250 coeff[6]=(double) image->columns/(coeff[5]-coeff[4]);
1251 coeff[7]=(double) image->rows/(coeff[0]-coeff[1]);
1253 else { /* *method == DePolarDistortion */
1254 coeff[6]=(coeff[5]-coeff[4])/image->columns;
1255 coeff[7]=(coeff[0]-coeff[1])/image->rows;
1259 case Cylinder2PlaneDistortion:
1260 case Plane2CylinderDistortion:
1262 /* 3D Cylinder to/from a Tangential Plane
1264 Projection between a clinder and flat plain from a point on the
1265 center line of the cylinder.
1267 The two surfaces coincide in 3D space at the given centers of
1268 distortion (perpendicular to projection point) on both images.
1271 Coefficents: FOV(radians), Radius, center_x,y, dest_center_x,y
1273 FOV (Field Of View) the angular field of view of the distortion,
1274 across the width of the image, in degrees. The centers are the
1275 points of least distortion in the input and resulting images.
1277 These centers are however determined later.
1279 Coeff 0 is the FOV angle of view of image width in radians
1280 Coeff 1 is calculated radius of cylinder.
1281 Coeff 2,3 center of distortion of input image
1282 Coefficents 4,5 Center of Distortion of dest (determined later)
1284 if ( arguments[0] < MagickEpsilon || arguments[0] > 160.0 ) {
1285 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
1286 "InvalidArgument", "%s : Invalid FOV Angle",
1287 CommandOptionToMnemonic(MagickDistortOptions, *method) );
1288 coeff=(double *) RelinquishMagickMemory(coeff);
1289 return((double *) NULL);
1291 coeff[0] = DegreesToRadians(arguments[0]);
1292 if ( *method == Cylinder2PlaneDistortion )
1293 /* image is curved around cylinder, so FOV angle (in radians)
1294 * scales directly to image X coordinate, according to its radius.
1296 coeff[1] = (double) image->columns/coeff[0];
1298 /* radius is distance away from an image with this angular FOV */
1299 coeff[1] = (double) image->columns / ( 2 * tan(coeff[0]/2) );
1301 coeff[2] = (double)(image->columns)/2.0+image->page.x;
1302 coeff[3] = (double)(image->rows)/2.0+image->page.y;
1303 coeff[4] = coeff[2];
1304 coeff[5] = coeff[3]; /* assuming image size is the same */
1307 case BarrelDistortion:
1308 case BarrelInverseDistortion:
1310 /* Barrel Distortion
1311 Rs=(A*Rd^3 + B*Rd^2 + C*Rd + D)*Rd
1312 BarrelInv Distortion
1313 Rs=Rd/(A*Rd^3 + B*Rd^2 + C*Rd + D)
1315 Where Rd is the normalized radius from corner to middle of image
1316 Input Arguments are one of the following forms (number of arguments)...
1321 8: Ax,Bx,Cx,Dx Ay,By,Cy,Dy
1322 10: Ax,Bx,Cx,Dx Ay,By,Cy,Dy X,Y
1324 Returns 10 coefficent values, which are de-normalized (pixel scale)
1325 Ax, Bx, Cx, Dx, Ay, By, Cy, Dy, Xc, Yc
1327 /* Radius de-normalization scaling factor */
1329 rscale = 2.0/MagickMin((double) image->columns,(double) image->rows);
1331 /* sanity check number of args must = 3,4,5,6,8,10 or error */
1332 if ( (number_arguments < 3) || (number_arguments == 7) ||
1333 (number_arguments == 9) || (number_arguments > 10) )
1335 coeff=(double *) RelinquishMagickMemory(coeff);
1336 (void) ThrowMagickException(exception,GetMagickModule(),
1337 OptionError,"InvalidArgument", "%s : number of arguments",
1338 CommandOptionToMnemonic(MagickDistortOptions, *method) );
1339 return((double *) NULL);
1341 /* A,B,C,D coefficients */
1342 coeff[0] = arguments[0];
1343 coeff[1] = arguments[1];
1344 coeff[2] = arguments[2];
1345 if ((number_arguments == 3) || (number_arguments == 5) )
1346 coeff[3] = 1.0 - coeff[0] - coeff[1] - coeff[2];
1348 coeff[3] = arguments[3];
1349 /* de-normalize the coefficients */
1350 coeff[0] *= pow(rscale,3.0);
1351 coeff[1] *= rscale*rscale;
1353 /* Y coefficients: as given OR same as X coefficients */
1354 if ( number_arguments >= 8 ) {
1355 coeff[4] = arguments[4] * pow(rscale,3.0);
1356 coeff[5] = arguments[5] * rscale*rscale;
1357 coeff[6] = arguments[6] * rscale;
1358 coeff[7] = arguments[7];
1361 coeff[4] = coeff[0];
1362 coeff[5] = coeff[1];
1363 coeff[6] = coeff[2];
1364 coeff[7] = coeff[3];
1366 /* X,Y Center of Distortion (image coodinates) */
1367 if ( number_arguments == 5 ) {
1368 coeff[8] = arguments[3];
1369 coeff[9] = arguments[4];
1371 else if ( number_arguments == 6 ) {
1372 coeff[8] = arguments[4];
1373 coeff[9] = arguments[5];
1375 else if ( number_arguments == 10 ) {
1376 coeff[8] = arguments[8];
1377 coeff[9] = arguments[9];
1380 /* center of the image provided (image coodinates) */
1381 coeff[8] = (double)image->columns/2.0 + image->page.x;
1382 coeff[9] = (double)image->rows/2.0 + image->page.y;
1386 case ShepardsDistortion:
1388 /* Shepards Distortion input arguments are the coefficents!
1389 Just check the number of arguments is valid!
1390 Args: u1,v1, x1,y1, ...
1391 OR : u1,v1, r1,g1,c1, ...
1393 if ( number_arguments%cp_size != 0 ||
1394 number_arguments < cp_size ) {
1395 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
1396 "InvalidArgument", "%s : 'requires CP's (4 numbers each)'",
1397 CommandOptionToMnemonic(MagickDistortOptions, *method));
1398 coeff=(double *) RelinquishMagickMemory(coeff);
1399 return((double *) NULL);
1401 /* User defined weighting power for Shepard's Method */
1402 { const char *artifact=GetImageArtifact(image,"shepards:power");
1403 if ( artifact != (const char *) NULL ) {
1404 coeff[0]=StringToDouble(artifact,(char **) NULL) / 2.0;
1405 if ( coeff[0] < MagickEpsilon ) {
1406 (void) ThrowMagickException(exception,GetMagickModule(),
1407 OptionError,"InvalidArgument","%s", "-define shepards:power" );
1408 coeff=(double *) RelinquishMagickMemory(coeff);
1409 return((double *) NULL);
1413 coeff[0]=1.0; /* Default power of 2 (Inverse Squared) */
1420 /* you should never reach this point */
1421 perror("no method handler"); /* just fail assertion */
1422 return((double *) NULL);
1426 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1430 + D i s t o r t R e s i z e I m a g e %
1434 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1436 % DistortResizeImage() resize image using the equivalent but slower image
1437 % distortion operator. The filter is applied using a EWA cylindrical
1438 % resampling. But like resize the final image size is limited to whole pixels
1439 % with no effects by virtual-pixels on the result.
1441 % Note that images containing a transparency channel will be twice as slow to
1442 % resize as images one without transparency.
1444 % The format of the DistortResizeImage method is:
1446 % Image *AdaptiveResizeImage(const Image *image,const size_t columns,
1447 % const size_t rows,ExceptionInfo *exception)
1449 % A description of each parameter follows:
1451 % o image: the image.
1453 % o columns: the number of columns in the resized image.
1455 % o rows: the number of rows in the resized image.
1457 % o exception: return any errors or warnings in this structure.
1460 MagickExport Image *DistortResizeImage(const Image *image,
1461 const size_t columns,const size_t rows,ExceptionInfo *exception)
1463 #define DistortResizeImageTag "Distort/Image"
1479 Distort resize image.
1481 assert(image != (const Image *) NULL);
1482 assert(image->signature == MagickSignature);
1483 if (image->debug != MagickFalse)
1484 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1485 assert(exception != (ExceptionInfo *) NULL);
1486 assert(exception->signature == MagickSignature);
1487 if ((columns == 0) || (rows == 0))
1488 return((Image *) NULL);
1489 /* Do not short-circuit this resize if final image size is unchanged */
1491 (void) ResetMagickMemory(distort_args,0,12*sizeof(double));
1492 distort_args[4]=(double) image->columns;
1493 distort_args[6]=(double) columns;
1494 distort_args[9]=(double) image->rows;
1495 distort_args[11]=(double) rows;
1497 vp_save=GetImageVirtualPixelMethod(image);
1499 tmp_image=CloneImage(image,0,0,MagickTrue,exception);
1500 if ( tmp_image == (Image *) NULL )
1501 return((Image *) NULL);
1502 (void) SetImageVirtualPixelMethod(tmp_image,TransparentVirtualPixelMethod,
1504 tmp_image->image_info=image->image_info; /* preserve global options */
1506 if (image->alpha_trait == UndefinedPixelTrait)
1509 Image has not transparency channel, so we free to use it
1511 (void) SetImageAlphaChannel(tmp_image,SetAlphaChannel,exception);
1512 resize_image=DistortImage(tmp_image,AffineDistortion,12,distort_args,
1513 MagickTrue,exception),
1515 tmp_image=DestroyImage(tmp_image);
1516 if ( resize_image == (Image *) NULL )
1517 return((Image *) NULL);
1519 (void) SetImageAlphaChannel(resize_image,DeactivateAlphaChannel,exception);
1524 Image has transparency so handle colors and alpha separatly.
1525 Basically we need to separate Virtual-Pixel alpha in the resized
1526 image, so only the actual original images alpha channel is used.
1528 distort alpha channel separately
1533 (void) SetImageAlphaChannel(tmp_image,ExtractAlphaChannel,exception);
1534 (void) SetImageAlphaChannel(tmp_image,OpaqueAlphaChannel,exception);
1535 resize_alpha=DistortImage(tmp_image,AffineDistortion,12,distort_args,
1536 MagickTrue,exception),
1537 tmp_image=DestroyImage(tmp_image);
1538 if (resize_alpha == (Image *) NULL)
1539 return((Image *) NULL);
1541 /* distort the actual image containing alpha + VP alpha */
1542 tmp_image=CloneImage(image,0,0,MagickTrue,exception);
1543 if ( tmp_image == (Image *) NULL )
1544 return((Image *) NULL);
1545 tmp_image->image_info=image->image_info; /* preserve global options */
1546 (void) SetImageVirtualPixelMethod(tmp_image,
1547 TransparentVirtualPixelMethod,exception);
1548 resize_image=DistortImage(tmp_image,AffineDistortion,12,distort_args,
1549 MagickTrue,exception),
1550 tmp_image=DestroyImage(tmp_image);
1551 if ( resize_image == (Image *) NULL)
1553 resize_alpha=DestroyImage(resize_alpha);
1554 return((Image *) NULL);
1556 /* replace resize images alpha with the separally distorted alpha */
1557 (void) SetImageAlphaChannel(resize_image,DeactivateAlphaChannel,
1559 (void) SetImageAlphaChannel(resize_alpha,DeactivateAlphaChannel,
1561 (void) CompositeImage(resize_image,resize_alpha,CopyAlphaCompositeOp,
1562 MagickTrue,0,0,exception);
1563 resize_alpha=DestroyImage(resize_alpha);
1565 (void) SetImageVirtualPixelMethod(resize_image,vp_save,exception);
1568 Clean up the results of the Distortion
1570 crop_area.width=columns;
1571 crop_area.height=rows;
1575 tmp_image=resize_image;
1576 resize_image=CropImage(tmp_image,&crop_area,exception);
1577 tmp_image=DestroyImage(tmp_image);
1578 return(resize_image);
1582 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1586 % D i s t o r t I m a g e %
1590 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1592 % DistortImage() distorts an image using various distortion methods, by
1593 % mapping color lookups of the source image to a new destination image
1594 % usally of the same size as the source image, unless 'bestfit' is set to
1597 % If 'bestfit' is enabled, and distortion allows it, the destination image is
1598 % adjusted to ensure the whole source 'image' will just fit within the final
1599 % destination image, which will be sized and offset accordingly. Also in
1600 % many cases the virtual offset of the source image will be taken into
1601 % account in the mapping.
1603 % If the '-verbose' control option has been set print to standard error the
1604 % equicelent '-fx' formula with coefficients for the function, if practical.
1606 % The format of the DistortImage() method is:
1608 % Image *DistortImage(const Image *image,const DistortImageMethod method,
1609 % const size_t number_arguments,const double *arguments,
1610 % MagickBooleanType bestfit, ExceptionInfo *exception)
1612 % A description of each parameter follows:
1614 % o image: the image to be distorted.
1616 % o method: the method of image distortion.
1618 % ArcDistortion always ignores source image offset, and always
1619 % 'bestfit' the destination image with the top left corner offset
1620 % relative to the polar mapping center.
1622 % Affine, Perspective, and Bilinear, do least squares fitting of the
1623 % distrotion when more than the minimum number of control point pairs
1626 % Perspective, and Bilinear, fall back to a Affine distortion when less
1627 % than 4 control point pairs are provided. While Affine distortions
1628 % let you use any number of control point pairs, that is Zero pairs is
1629 % a No-Op (viewport only) distortion, one pair is a translation and
1630 % two pairs of control points do a scale-rotate-translate, without any
1633 % o number_arguments: the number of arguments given.
1635 % o arguments: an array of floating point arguments for this method.
1637 % o bestfit: Attempt to 'bestfit' the size of the resulting image.
1638 % This also forces the resulting image to be a 'layered' virtual
1639 % canvas image. Can be overridden using 'distort:viewport' setting.
1641 % o exception: return any errors or warnings in this structure
1643 % Extra Controls from Image meta-data (artifacts)...
1646 % Output to stderr alternatives, internal coefficents, and FX
1647 % equivalents for the distortion operation (if feasible).
1648 % This forms an extra check of the distortion method, and allows users
1649 % access to the internal constants IM calculates for the distortion.
1651 % o "distort:viewport"
1652 % Directly set the output image canvas area and offest to use for the
1653 % resulting image, rather than use the original images canvas, or a
1654 % calculated 'bestfit' canvas.
1657 % Scale the size of the output canvas by this amount to provide a
1658 % method of Zooming, and for super-sampling the results.
1660 % Other settings that can effect results include
1662 % o 'interpolate' For source image lookups (scale enlargements)
1664 % o 'filter' Set filter to use for area-resampling (scale shrinking).
1665 % Set to 'point' to turn off and use 'interpolate' lookup
1669 MagickExport Image *DistortImage(const Image *image,DistortImageMethod method,
1670 const size_t number_arguments,const double *arguments,
1671 MagickBooleanType bestfit,ExceptionInfo *exception)
1673 #define DistortImageTag "Distort/Image"
1683 geometry; /* geometry of the distorted space viewport */
1688 assert(image != (Image *) NULL);
1689 assert(image->signature == MagickSignature);
1690 if (image->debug != MagickFalse)
1691 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1692 assert(exception != (ExceptionInfo *) NULL);
1693 assert(exception->signature == MagickSignature);
1696 Handle Special Compound Distortions
1698 if ( method == ResizeDistortion )
1700 if ( number_arguments != 2 )
1702 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
1703 "InvalidArgument","%s : '%s'","Resize",
1704 "Invalid number of args: 2 only");
1705 return((Image *) NULL);
1707 distort_image=DistortResizeImage(image,(size_t)arguments[0],
1708 (size_t)arguments[1], exception);
1709 return(distort_image);
1713 Convert input arguments (usually as control points for reverse mapping)
1714 into mapping coefficients to apply the distortion.
1716 Note that some distortions are mapped to other distortions,
1717 and as such do not require specific code after this point.
1719 coeff = GenerateCoefficients(image, &method, number_arguments,
1720 arguments, 0, exception);
1721 if ( coeff == (double *) NULL )
1722 return((Image *) NULL);
1725 Determine the size and offset for a 'bestfit' destination.
1726 Usally the four corners of the source image is enough.
1729 /* default output image bounds, when no 'bestfit' is requested */
1730 geometry.width=image->columns;
1731 geometry.height=image->rows;
1735 if ( method == ArcDistortion ) {
1736 bestfit = MagickTrue; /* always calculate a 'best fit' viewport */
1739 /* Work out the 'best fit', (required for ArcDistortion) */
1742 s,d,min,max; /* source, dest coords --mapping--> min, max coords */
1745 fix_bounds = MagickTrue; /* enlarge bounds for VP handling */
1747 s.x=s.y=min.x=max.x=min.y=max.y=0.0; /* keep compiler happy */
1749 /* defines to figure out the bounds of the distorted image */
1750 #define InitalBounds(p) \
1752 /* printf("%lg,%lg -> %lg,%lg\n", s.x,s.y, d.x,d.y); */ \
1753 min.x = max.x = p.x; \
1754 min.y = max.y = p.y; \
1756 #define ExpandBounds(p) \
1758 /* printf("%lg,%lg -> %lg,%lg\n", s.x,s.y, d.x,d.y); */ \
1759 min.x = MagickMin(min.x,p.x); \
1760 max.x = MagickMax(max.x,p.x); \
1761 min.y = MagickMin(min.y,p.y); \
1762 max.y = MagickMax(max.y,p.y); \
1767 case AffineDistortion:
1768 { double inverse[6];
1769 InvertAffineCoefficients(coeff, inverse);
1770 s.x = (double) image->page.x;
1771 s.y = (double) image->page.y;
1772 d.x = inverse[0]*s.x+inverse[1]*s.y+inverse[2];
1773 d.y = inverse[3]*s.x+inverse[4]*s.y+inverse[5];
1775 s.x = (double) image->page.x+image->columns;
1776 s.y = (double) image->page.y;
1777 d.x = inverse[0]*s.x+inverse[1]*s.y+inverse[2];
1778 d.y = inverse[3]*s.x+inverse[4]*s.y+inverse[5];
1780 s.x = (double) image->page.x;
1781 s.y = (double) image->page.y+image->rows;
1782 d.x = inverse[0]*s.x+inverse[1]*s.y+inverse[2];
1783 d.y = inverse[3]*s.x+inverse[4]*s.y+inverse[5];
1785 s.x = (double) image->page.x+image->columns;
1786 s.y = (double) image->page.y+image->rows;
1787 d.x = inverse[0]*s.x+inverse[1]*s.y+inverse[2];
1788 d.y = inverse[3]*s.x+inverse[4]*s.y+inverse[5];
1792 case PerspectiveDistortion:
1793 { double inverse[8], scale;
1794 InvertPerspectiveCoefficients(coeff, inverse);
1795 s.x = (double) image->page.x;
1796 s.y = (double) image->page.y;
1797 scale=inverse[6]*s.x+inverse[7]*s.y+1.0;
1798 scale=PerceptibleReciprocal(scale);
1799 d.x = scale*(inverse[0]*s.x+inverse[1]*s.y+inverse[2]);
1800 d.y = scale*(inverse[3]*s.x+inverse[4]*s.y+inverse[5]);
1802 s.x = (double) image->page.x+image->columns;
1803 s.y = (double) image->page.y;
1804 scale=inverse[6]*s.x+inverse[7]*s.y+1.0;
1805 scale=PerceptibleReciprocal(scale);
1806 d.x = scale*(inverse[0]*s.x+inverse[1]*s.y+inverse[2]);
1807 d.y = scale*(inverse[3]*s.x+inverse[4]*s.y+inverse[5]);
1809 s.x = (double) image->page.x;
1810 s.y = (double) image->page.y+image->rows;
1811 scale=inverse[6]*s.x+inverse[7]*s.y+1.0;
1812 scale=PerceptibleReciprocal(scale);
1813 d.x = scale*(inverse[0]*s.x+inverse[1]*s.y+inverse[2]);
1814 d.y = scale*(inverse[3]*s.x+inverse[4]*s.y+inverse[5]);
1816 s.x = (double) image->page.x+image->columns;
1817 s.y = (double) image->page.y+image->rows;
1818 scale=inverse[6]*s.x+inverse[7]*s.y+1.0;
1819 scale=PerceptibleReciprocal(scale);
1820 d.x = scale*(inverse[0]*s.x+inverse[1]*s.y+inverse[2]);
1821 d.y = scale*(inverse[3]*s.x+inverse[4]*s.y+inverse[5]);
1827 /* Forward Map Corners */
1828 a = coeff[0]-coeff[1]/2; ca = cos(a); sa = sin(a);
1832 d.x = (coeff[2]-coeff[3])*ca;
1833 d.y = (coeff[2]-coeff[3])*sa;
1835 a = coeff[0]+coeff[1]/2; ca = cos(a); sa = sin(a);
1839 d.x = (coeff[2]-coeff[3])*ca;
1840 d.y = (coeff[2]-coeff[3])*sa;
1842 /* Orthogonal points along top of arc */
1843 for( a=(double) (ceil((double) ((coeff[0]-coeff[1]/2.0)/MagickPI2))*MagickPI2);
1844 a<(coeff[0]+coeff[1]/2.0); a+=MagickPI2 ) {
1845 ca = cos(a); sa = sin(a);
1851 Convert the angle_to_width and radius_to_height
1852 to appropriate scaling factors, to allow faster processing
1853 in the mapping function.
1855 coeff[1] = (double) (Magick2PI*image->columns/coeff[1]);
1856 coeff[3] = (double)image->rows/coeff[3];
1859 case PolarDistortion:
1861 if (number_arguments < 2)
1862 coeff[2] = coeff[3] = 0.0;
1863 min.x = coeff[2]-coeff[0];
1864 max.x = coeff[2]+coeff[0];
1865 min.y = coeff[3]-coeff[0];
1866 max.y = coeff[3]+coeff[0];
1867 /* should be about 1.0 if Rmin = 0 */
1868 coeff[7]=(double) geometry.height/(coeff[0]-coeff[1]);
1871 case DePolarDistortion:
1873 /* direct calculation as it needs to tile correctly
1874 * for reversibility in a DePolar-Polar cycle */
1875 fix_bounds = MagickFalse;
1876 geometry.x = geometry.y = 0;
1877 geometry.height = (size_t) ceil(coeff[0]-coeff[1]);
1878 geometry.width = (size_t)
1879 ceil((coeff[0]-coeff[1])*(coeff[5]-coeff[4])*0.5);
1880 /* correct scaling factors relative to new size */
1881 coeff[6]=(coeff[5]-coeff[4])/geometry.width; /* changed width */
1882 coeff[7]=(coeff[0]-coeff[1])/geometry.height; /* should be about 1.0 */
1885 case Cylinder2PlaneDistortion:
1887 /* direct calculation so center of distortion is either a pixel
1888 * center, or pixel edge. This allows for reversibility of the
1890 geometry.x = geometry.y = 0;
1891 geometry.width = (size_t) ceil( 2.0*coeff[1]*tan(coeff[0]/2.0) );
1892 geometry.height = (size_t) ceil( 2.0*coeff[3]/cos(coeff[0]/2.0) );
1893 /* correct center of distortion relative to new size */
1894 coeff[4] = (double) geometry.width/2.0;
1895 coeff[5] = (double) geometry.height/2.0;
1896 fix_bounds = MagickFalse;
1899 case Plane2CylinderDistortion:
1901 /* direct calculation center is either pixel center, or pixel edge
1902 * so as to allow reversibility of the image distortion */
1903 geometry.x = geometry.y = 0;
1904 geometry.width = (size_t) ceil(coeff[0]*coeff[1]); /* FOV * radius */
1905 geometry.height = (size_t) (2*coeff[3]); /* input image height */
1906 /* correct center of distortion relative to new size */
1907 coeff[4] = (double) geometry.width/2.0;
1908 coeff[5] = (double) geometry.height/2.0;
1909 fix_bounds = MagickFalse;
1912 case ShepardsDistortion:
1913 case BilinearForwardDistortion:
1914 case BilinearReverseDistortion:
1916 case QuadrilateralDistortion:
1918 case PolynomialDistortion:
1919 case BarrelDistortion:
1920 case BarrelInverseDistortion:
1922 /* no calculated bestfit available for these distortions */
1923 bestfit = MagickFalse;
1924 fix_bounds = MagickFalse;
1928 /* Set the output image geometry to calculated 'bestfit'.
1929 Yes this tends to 'over do' the file image size, ON PURPOSE!
1930 Do not do this for DePolar which needs to be exact for virtual tiling.
1933 geometry.x = (ssize_t) floor(min.x-0.5);
1934 geometry.y = (ssize_t) floor(min.y-0.5);
1935 geometry.width=(size_t) ceil(max.x-geometry.x+0.5);
1936 geometry.height=(size_t) ceil(max.y-geometry.y+0.5);
1939 } /* end bestfit destination image calculations */
1941 /* The user provided a 'viewport' expert option which may
1942 overrides some parts of the current output image geometry.
1943 This also overrides its default 'bestfit' setting.
1945 { const char *artifact=GetImageArtifact(image,"distort:viewport");
1946 viewport_given = MagickFalse;
1947 if ( artifact != (const char *) NULL ) {
1948 MagickStatusType flags=ParseAbsoluteGeometry(artifact,&geometry);
1950 (void) ThrowMagickException(exception,GetMagickModule(),
1951 OptionWarning,"InvalidSetting","'%s' '%s'",
1952 "distort:viewport",artifact);
1954 viewport_given = MagickTrue;
1958 /* Verbose output */
1959 if ( IfStringTrue(GetImageArtifact(image,"verbose")) ) {
1962 char image_gen[MagickPathExtent];
1965 /* Set destination image size and virtual offset */
1966 if ( bestfit || viewport_given ) {
1967 (void) FormatLocaleString(image_gen, MagickPathExtent," -size %.20gx%.20g "
1968 "-page %+.20g%+.20g xc: +insert \\\n",(double) geometry.width,
1969 (double) geometry.height,(double) geometry.x,(double) geometry.y);
1970 lookup="v.p{ xx-v.page.x-.5, yy-v.page.y-.5 }";
1973 image_gen[0] = '\0'; /* no destination to generate */
1974 lookup = "p{ xx-page.x-.5, yy-page.y-.5 }"; /* simplify lookup */
1978 case AffineDistortion:
1982 inverse = (double *) AcquireQuantumMemory(6,sizeof(*inverse));
1983 if (inverse == (double *) NULL) {
1984 coeff = (double *) RelinquishMagickMemory(coeff);
1985 (void) ThrowMagickException(exception,GetMagickModule(),
1986 ResourceLimitError,"MemoryAllocationFailed",
1987 "%s", "DistortImages");
1988 return((Image *) NULL);
1990 InvertAffineCoefficients(coeff, inverse);
1991 CoefficientsToAffineArgs(inverse);
1992 (void) FormatLocaleFile(stderr, "Affine Projection:\n");
1993 (void) FormatLocaleFile(stderr, " -distort AffineProjection \\\n '");
1994 for (i=0; i < 5; i++)
1995 (void) FormatLocaleFile(stderr, "%lf,", inverse[i]);
1996 (void) FormatLocaleFile(stderr, "%lf'\n", inverse[5]);
1997 inverse = (double *) RelinquishMagickMemory(inverse);
1999 (void) FormatLocaleFile(stderr, "Affine Distort, FX Equivelent:\n");
2000 (void) FormatLocaleFile(stderr, "%s", image_gen);
2001 (void) FormatLocaleFile(stderr, " -fx 'ii=i+page.x+0.5; jj=j+page.y+0.5;\n");
2002 (void) FormatLocaleFile(stderr, " xx=%+lf*ii %+lf*jj %+lf;\n",
2003 coeff[0], coeff[1], coeff[2]);
2004 (void) FormatLocaleFile(stderr, " yy=%+lf*ii %+lf*jj %+lf;\n",
2005 coeff[3], coeff[4], coeff[5]);
2006 (void) FormatLocaleFile(stderr, " %s' \\\n", lookup);
2011 case PerspectiveDistortion:
2015 inverse = (double *) AcquireQuantumMemory(8,sizeof(*inverse));
2016 if (inverse == (double *) NULL) {
2017 coeff = (double *) RelinquishMagickMemory(coeff);
2018 (void) ThrowMagickException(exception,GetMagickModule(),
2019 ResourceLimitError,"MemoryAllocationFailed",
2020 "%s", "DistortCoefficients");
2021 return((Image *) NULL);
2023 InvertPerspectiveCoefficients(coeff, inverse);
2024 (void) FormatLocaleFile(stderr, "Perspective Projection:\n");
2025 (void) FormatLocaleFile(stderr, " -distort PerspectiveProjection \\\n '");
2027 (void) FormatLocaleFile(stderr, "%lf, ", inverse[i]);
2028 (void) FormatLocaleFile(stderr, "\n ");
2030 (void) FormatLocaleFile(stderr, "%lf, ", inverse[i]);
2031 (void) FormatLocaleFile(stderr, "%lf'\n", inverse[7]);
2032 inverse = (double *) RelinquishMagickMemory(inverse);
2034 (void) FormatLocaleFile(stderr, "Perspective Distort, FX Equivelent:\n");
2035 (void) FormatLocaleFile(stderr, "%s", image_gen);
2036 (void) FormatLocaleFile(stderr, " -fx 'ii=i+page.x+0.5; jj=j+page.y+0.5;\n");
2037 (void) FormatLocaleFile(stderr, " rr=%+lf*ii %+lf*jj + 1;\n",
2038 coeff[6], coeff[7]);
2039 (void) FormatLocaleFile(stderr, " xx=(%+lf*ii %+lf*jj %+lf)/rr;\n",
2040 coeff[0], coeff[1], coeff[2]);
2041 (void) FormatLocaleFile(stderr, " yy=(%+lf*ii %+lf*jj %+lf)/rr;\n",
2042 coeff[3], coeff[4], coeff[5]);
2043 (void) FormatLocaleFile(stderr, " rr%s0 ? %s : blue' \\\n",
2044 coeff[8] < 0 ? "<" : ">", lookup);
2048 case BilinearForwardDistortion:
2049 (void) FormatLocaleFile(stderr, "BilinearForward Mapping Equations:\n");
2050 (void) FormatLocaleFile(stderr, "%s", image_gen);
2051 (void) FormatLocaleFile(stderr, " i = %+lf*x %+lf*y %+lf*x*y %+lf;\n",
2052 coeff[0], coeff[1], coeff[2], coeff[3]);
2053 (void) FormatLocaleFile(stderr, " j = %+lf*x %+lf*y %+lf*x*y %+lf;\n",
2054 coeff[4], coeff[5], coeff[6], coeff[7]);
2057 (void) FormatLocaleFile(stderr, " c8 = %+lf c9 = 2*a = %+lf;\n",
2058 coeff[8], coeff[9]);
2060 (void) FormatLocaleFile(stderr, "BilinearForward Distort, FX Equivelent:\n");
2061 (void) FormatLocaleFile(stderr, "%s", image_gen);
2062 (void) FormatLocaleFile(stderr, " -fx 'ii=i+page.x%+lf; jj=j+page.y%+lf;\n",
2063 0.5-coeff[3], 0.5-coeff[7]);
2064 (void) FormatLocaleFile(stderr, " bb=%lf*ii %+lf*jj %+lf;\n",
2065 coeff[6], -coeff[2], coeff[8]);
2066 /* Handle Special degenerate (non-quadratic) or trapezoidal case */
2067 if ( coeff[9] != 0 ) {
2068 (void) FormatLocaleFile(stderr, " rt=bb*bb %+lf*(%lf*ii%+lf*jj);\n",
2069 -2*coeff[9], coeff[4], -coeff[0]);
2070 (void) FormatLocaleFile(stderr, " yy=( -bb + sqrt(rt) ) / %lf;\n",
2073 (void) FormatLocaleFile(stderr, " yy=(%lf*ii%+lf*jj)/bb;\n",
2074 -coeff[4], coeff[0]);
2075 (void) FormatLocaleFile(stderr, " xx=(ii %+lf*yy)/(%lf %+lf*yy);\n",
2076 -coeff[1], coeff[0], coeff[2]);
2077 if ( coeff[9] != 0 )
2078 (void) FormatLocaleFile(stderr, " (rt < 0 ) ? red : %s'\n", lookup);
2080 (void) FormatLocaleFile(stderr, " %s' \\\n", lookup);
2083 case BilinearReverseDistortion:
2085 (void) FormatLocaleFile(stderr, "Polynomial Projection Distort:\n");
2086 (void) FormatLocaleFile(stderr, " -distort PolynomialProjection \\\n");
2087 (void) FormatLocaleFile(stderr, " '1.5, %lf, %lf, %lf, %lf,\n",
2088 coeff[3], coeff[0], coeff[1], coeff[2]);
2089 (void) FormatLocaleFile(stderr, " %lf, %lf, %lf, %lf'\n",
2090 coeff[7], coeff[4], coeff[5], coeff[6]);
2092 (void) FormatLocaleFile(stderr, "BilinearReverse Distort, FX Equivelent:\n");
2093 (void) FormatLocaleFile(stderr, "%s", image_gen);
2094 (void) FormatLocaleFile(stderr, " -fx 'ii=i+page.x+0.5; jj=j+page.y+0.5;\n");
2095 (void) FormatLocaleFile(stderr, " xx=%+lf*ii %+lf*jj %+lf*ii*jj %+lf;\n",
2096 coeff[0], coeff[1], coeff[2], coeff[3]);
2097 (void) FormatLocaleFile(stderr, " yy=%+lf*ii %+lf*jj %+lf*ii*jj %+lf;\n",
2098 coeff[4], coeff[5], coeff[6], coeff[7]);
2099 (void) FormatLocaleFile(stderr, " %s' \\\n", lookup);
2102 case PolynomialDistortion:
2104 size_t nterms = (size_t) coeff[1];
2105 (void) FormatLocaleFile(stderr, "Polynomial (order %lg, terms %lu), FX Equivelent\n",
2106 coeff[0],(unsigned long) nterms);
2107 (void) FormatLocaleFile(stderr, "%s", image_gen);
2108 (void) FormatLocaleFile(stderr, " -fx 'ii=i+page.x+0.5; jj=j+page.y+0.5;\n");
2109 (void) FormatLocaleFile(stderr, " xx =");
2110 for (i=0; i<(ssize_t) nterms; i++) {
2111 if ( i != 0 && i%4 == 0 ) (void) FormatLocaleFile(stderr, "\n ");
2112 (void) FormatLocaleFile(stderr, " %+lf%s", coeff[2+i],
2115 (void) FormatLocaleFile(stderr, ";\n yy =");
2116 for (i=0; i<(ssize_t) nterms; i++) {
2117 if ( i != 0 && i%4 == 0 ) (void) FormatLocaleFile(stderr, "\n ");
2118 (void) FormatLocaleFile(stderr, " %+lf%s", coeff[2+i+nterms],
2121 (void) FormatLocaleFile(stderr, ";\n %s' \\\n", lookup);
2126 (void) FormatLocaleFile(stderr, "Arc Distort, Internal Coefficients:\n");
2127 for ( i=0; i<5; i++ )
2128 (void) FormatLocaleFile(stderr, " c%.20g = %+lf\n", (double) i, coeff[i]);
2129 (void) FormatLocaleFile(stderr, "Arc Distort, FX Equivelent:\n");
2130 (void) FormatLocaleFile(stderr, "%s", image_gen);
2131 (void) FormatLocaleFile(stderr, " -fx 'ii=i+page.x; jj=j+page.y;\n");
2132 (void) FormatLocaleFile(stderr, " xx=(atan2(jj,ii)%+lf)/(2*pi);\n",
2134 (void) FormatLocaleFile(stderr, " xx=xx-round(xx);\n");
2135 (void) FormatLocaleFile(stderr, " xx=xx*%lf %+lf;\n",
2136 coeff[1], coeff[4]);
2137 (void) FormatLocaleFile(stderr, " yy=(%lf - hypot(ii,jj)) * %lf;\n",
2138 coeff[2], coeff[3]);
2139 (void) FormatLocaleFile(stderr, " v.p{xx-.5,yy-.5}' \\\n");
2142 case PolarDistortion:
2144 (void) FormatLocaleFile(stderr, "Polar Distort, Internal Coefficents\n");
2145 for ( i=0; i<8; i++ )
2146 (void) FormatLocaleFile(stderr, " c%.20g = %+lf\n", (double) i, coeff[i]);
2147 (void) FormatLocaleFile(stderr, "Polar Distort, FX Equivelent:\n");
2148 (void) FormatLocaleFile(stderr, "%s", image_gen);
2149 (void) FormatLocaleFile(stderr, " -fx 'ii=i+page.x%+lf; jj=j+page.y%+lf;\n",
2150 -coeff[2], -coeff[3]);
2151 (void) FormatLocaleFile(stderr, " xx=(atan2(ii,jj)%+lf)/(2*pi);\n",
2152 -(coeff[4]+coeff[5])/2 );
2153 (void) FormatLocaleFile(stderr, " xx=xx-round(xx);\n");
2154 (void) FormatLocaleFile(stderr, " xx=xx*2*pi*%lf + v.w/2;\n",
2156 (void) FormatLocaleFile(stderr, " yy=(hypot(ii,jj)%+lf)*%lf;\n",
2157 -coeff[1], coeff[7] );
2158 (void) FormatLocaleFile(stderr, " v.p{xx-.5,yy-.5}' \\\n");
2161 case DePolarDistortion:
2163 (void) FormatLocaleFile(stderr, "DePolar Distort, Internal Coefficents\n");
2164 for ( i=0; i<8; i++ )
2165 (void) FormatLocaleFile(stderr, " c%.20g = %+lf\n", (double) i, coeff[i]);
2166 (void) FormatLocaleFile(stderr, "DePolar Distort, FX Equivelent:\n");
2167 (void) FormatLocaleFile(stderr, "%s", image_gen);
2168 (void) FormatLocaleFile(stderr, " -fx 'aa=(i+.5)*%lf %+lf;\n", coeff[6], +coeff[4] );
2169 (void) FormatLocaleFile(stderr, " rr=(j+.5)*%lf %+lf;\n", coeff[7], +coeff[1] );
2170 (void) FormatLocaleFile(stderr, " xx=rr*sin(aa) %+lf;\n", coeff[2] );
2171 (void) FormatLocaleFile(stderr, " yy=rr*cos(aa) %+lf;\n", coeff[3] );
2172 (void) FormatLocaleFile(stderr, " v.p{xx-.5,yy-.5}' \\\n");
2175 case Cylinder2PlaneDistortion:
2177 (void) FormatLocaleFile(stderr, "Cylinder to Plane Distort, Internal Coefficents\n");
2178 (void) FormatLocaleFile(stderr, " cylinder_radius = %+lf\n", coeff[1]);
2179 (void) FormatLocaleFile(stderr, "Cylinder to Plane Distort, FX Equivelent:\n");
2180 (void) FormatLocaleFile(stderr, "%s", image_gen);
2181 (void) FormatLocaleFile(stderr, " -fx 'ii=i+page.x%+lf+0.5; jj=j+page.y%+lf+0.5;\n",
2182 -coeff[4], -coeff[5]);
2183 (void) FormatLocaleFile(stderr, " aa=atan(ii/%+lf);\n", coeff[1] );
2184 (void) FormatLocaleFile(stderr, " xx=%lf*aa%+lf;\n",
2185 coeff[1], coeff[2] );
2186 (void) FormatLocaleFile(stderr, " yy=jj*cos(aa)%+lf;\n", coeff[3] );
2187 (void) FormatLocaleFile(stderr, " %s' \\\n", lookup);
2190 case Plane2CylinderDistortion:
2192 (void) FormatLocaleFile(stderr, "Plane to Cylinder Distort, Internal Coefficents\n");
2193 (void) FormatLocaleFile(stderr, " cylinder_radius = %+lf\n", coeff[1]);
2194 (void) FormatLocaleFile(stderr, "Plane to Cylinder Distort, FX Equivelent:\n");
2195 (void) FormatLocaleFile(stderr, "%s", image_gen);
2196 (void) FormatLocaleFile(stderr, " -fx 'ii=i+page.x%+lf+0.5; jj=j+page.y%+lf+0.5;\n",
2197 -coeff[4], -coeff[5]);
2198 (void) FormatLocaleFile(stderr, " ii=ii/%+lf;\n", coeff[1] );
2199 (void) FormatLocaleFile(stderr, " xx=%lf*tan(ii)%+lf;\n",
2200 coeff[1], coeff[2] );
2201 (void) FormatLocaleFile(stderr, " yy=jj/cos(ii)%+lf;\n",
2203 (void) FormatLocaleFile(stderr, " %s' \\\n", lookup);
2206 case BarrelDistortion:
2207 case BarrelInverseDistortion:
2209 /* NOTE: This does the barrel roll in pixel coords not image coords
2210 ** The internal distortion must do it in image coordinates,
2211 ** so that is what the center coeff (8,9) is given in.
2213 xc = ((double)image->columns-1.0)/2.0 + image->page.x;
2214 yc = ((double)image->rows-1.0)/2.0 + image->page.y;
2215 (void) FormatLocaleFile(stderr, "Barrel%s Distort, FX Equivelent:\n",
2216 method == BarrelDistortion ? "" : "Inv");
2217 (void) FormatLocaleFile(stderr, "%s", image_gen);
2218 if ( fabs(coeff[8]-xc-0.5) < 0.1 && fabs(coeff[9]-yc-0.5) < 0.1 )
2219 (void) FormatLocaleFile(stderr, " -fx 'xc=(w-1)/2; yc=(h-1)/2;\n");
2221 (void) FormatLocaleFile(stderr, " -fx 'xc=%lf; yc=%lf;\n",
2222 coeff[8]-0.5, coeff[9]-0.5);
2223 (void) FormatLocaleFile(stderr,
2224 " ii=i-xc; jj=j-yc; rr=hypot(ii,jj);\n");
2225 (void) FormatLocaleFile(stderr, " ii=ii%s(%lf*rr*rr*rr %+lf*rr*rr %+lf*rr %+lf);\n",
2226 method == BarrelDistortion ? "*" : "/",
2227 coeff[0],coeff[1],coeff[2],coeff[3]);
2228 (void) FormatLocaleFile(stderr, " jj=jj%s(%lf*rr*rr*rr %+lf*rr*rr %+lf*rr %+lf);\n",
2229 method == BarrelDistortion ? "*" : "/",
2230 coeff[4],coeff[5],coeff[6],coeff[7]);
2231 (void) FormatLocaleFile(stderr, " v.p{fx*ii+xc,fy*jj+yc}' \\\n");
2238 /* The user provided a 'scale' expert option will scale the
2239 output image size, by the factor given allowing for super-sampling
2240 of the distorted image space. Any scaling factors must naturally
2241 be halved as a result.
2243 { const char *artifact;
2244 artifact=GetImageArtifact(image,"distort:scale");
2245 output_scaling = 1.0;
2246 if (artifact != (const char *) NULL) {
2247 output_scaling = fabs(StringToDouble(artifact,(char **) NULL));
2248 geometry.width=(size_t) (output_scaling*geometry.width+0.5);
2249 geometry.height=(size_t) (output_scaling*geometry.height+0.5);
2250 geometry.x=(ssize_t) (output_scaling*geometry.x+0.5);
2251 geometry.y=(ssize_t) (output_scaling*geometry.y+0.5);
2252 if ( output_scaling < 0.1 ) {
2253 coeff = (double *) RelinquishMagickMemory(coeff);
2254 (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
2255 "InvalidArgument","%s", "-set option:distort:scale" );
2256 return((Image *) NULL);
2258 output_scaling = 1/output_scaling;
2261 #define ScaleFilter(F,A,B,C,D) \
2262 ScaleResampleFilter( (F), \
2263 output_scaling*(A), output_scaling*(B), \
2264 output_scaling*(C), output_scaling*(D) )
2267 Initialize the distort image attributes.
2269 distort_image=CloneImage(image,geometry.width,geometry.height,MagickTrue,
2271 if (distort_image == (Image *) NULL)
2272 return((Image *) NULL);
2273 /* if image is ColorMapped - change it to DirectClass */
2274 if (SetImageStorageClass(distort_image,DirectClass,exception) == MagickFalse)
2276 distort_image=DestroyImage(distort_image);
2277 return((Image *) NULL);
2279 if ((IsPixelInfoGray(&distort_image->background_color) == MagickFalse) &&
2280 (IsGrayColorspace(distort_image->colorspace) != MagickFalse))
2281 (void) SetImageColorspace(distort_image,sRGBColorspace,exception);
2282 if (distort_image->background_color.alpha_trait != UndefinedPixelTrait)
2283 distort_image->alpha_trait=BlendPixelTrait;
2284 distort_image->page.x=geometry.x;
2285 distort_image->page.y=geometry.y;
2287 { /* ----- MAIN CODE -----
2288 Sample the source image to each pixel in the distort image.
2303 **restrict resample_filter;
2310 GetPixelInfo(distort_image,&zero);
2311 resample_filter=AcquireResampleFilterThreadSet(image,
2312 UndefinedVirtualPixelMethod,MagickFalse,exception);
2313 distort_view=AcquireAuthenticCacheView(distort_image,exception);
2314 #if defined(MAGICKCORE_OPENMP_SUPPORT)
2315 #pragma omp parallel for schedule(static,4) shared(progress,status) \
2316 magick_threads(image,distort_image,distort_image->rows,1)
2318 for (j=0; j < (ssize_t) distort_image->rows; j++)
2321 id = GetOpenMPThreadId();
2324 validity; /* how mathematically valid is this the mapping */
2330 pixel, /* pixel color to assign to distorted image */
2331 invalid; /* the color to assign when distort result is invalid */
2335 s; /* transform destination image x,y to source image x,y */
2343 q=QueueCacheViewAuthenticPixels(distort_view,0,j,distort_image->columns,1,
2345 if (q == (Quantum *) NULL)
2352 /* Define constant scaling vectors for Affine Distortions
2353 Other methods are either variable, or use interpolated lookup
2357 case AffineDistortion:
2358 ScaleFilter( resample_filter[id],
2360 coeff[3], coeff[4] );
2366 /* Initialize default pixel validity
2367 * negative: pixel is invalid output 'matte_color'
2368 * 0.0 to 1.0: antialiased, mix with resample output
2369 * 1.0 or greater: use resampled output.
2373 ConformPixelInfo(distort_image,&distort_image->matte_color,&invalid,
2375 for (i=0; i < (ssize_t) distort_image->columns; i++)
2377 /* map pixel coordinate to distortion space coordinate */
2378 d.x = (double) (geometry.x+i+0.5)*output_scaling;
2379 d.y = (double) (geometry.y+j+0.5)*output_scaling;
2380 s = d; /* default is a no-op mapping */
2383 case AffineDistortion:
2385 s.x=coeff[0]*d.x+coeff[1]*d.y+coeff[2];
2386 s.y=coeff[3]*d.x+coeff[4]*d.y+coeff[5];
2387 /* Affine partial derivitives are constant -- set above */
2390 case PerspectiveDistortion:
2393 p,q,r,abs_r,abs_c6,abs_c7,scale;
2394 /* perspective is a ratio of affines */
2395 p=coeff[0]*d.x+coeff[1]*d.y+coeff[2];
2396 q=coeff[3]*d.x+coeff[4]*d.y+coeff[5];
2397 r=coeff[6]*d.x+coeff[7]*d.y+1.0;
2398 /* Pixel Validity -- is it a 'sky' or 'ground' pixel */
2399 validity = (r*coeff[8] < 0.0) ? 0.0 : 1.0;
2400 /* Determine horizon anti-alias blending */
2402 abs_c6 = fabs(coeff[6]);
2403 abs_c7 = fabs(coeff[7]);
2404 if ( abs_c6 > abs_c7 ) {
2405 if ( abs_r < abs_c6*output_scaling )
2406 validity = 0.5 - coeff[8]*r/(coeff[6]*output_scaling);
2408 else if ( abs_r < abs_c7*output_scaling )
2409 validity = 0.5 - coeff[8]*r/(coeff[7]*output_scaling);
2410 /* Perspective Sampling Point (if valid) */
2411 if ( validity > 0.0 ) {
2412 /* divide by r affine, for perspective scaling */
2416 /* Perspective Partial Derivatives or Scaling Vectors */
2418 ScaleFilter( resample_filter[id],
2419 (r*coeff[0] - p*coeff[6])*scale,
2420 (r*coeff[1] - p*coeff[7])*scale,
2421 (r*coeff[3] - q*coeff[6])*scale,
2422 (r*coeff[4] - q*coeff[7])*scale );
2426 case BilinearReverseDistortion:
2428 /* Reversed Mapped is just a simple polynomial */
2429 s.x=coeff[0]*d.x+coeff[1]*d.y+coeff[2]*d.x*d.y+coeff[3];
2430 s.y=coeff[4]*d.x+coeff[5]*d.y
2431 +coeff[6]*d.x*d.y+coeff[7];
2432 /* Bilinear partial derivitives of scaling vectors */
2433 ScaleFilter( resample_filter[id],
2434 coeff[0] + coeff[2]*d.y,
2435 coeff[1] + coeff[2]*d.x,
2436 coeff[4] + coeff[6]*d.y,
2437 coeff[5] + coeff[6]*d.x );
2440 case BilinearForwardDistortion:
2442 /* Forward mapped needs reversed polynomial equations
2443 * which unfortunatally requires a square root! */
2445 d.x -= coeff[3]; d.y -= coeff[7];
2446 b = coeff[6]*d.x - coeff[2]*d.y + coeff[8];
2447 c = coeff[4]*d.x - coeff[0]*d.y;
2450 /* Handle Special degenerate (non-quadratic) case
2451 * Currently without horizon anti-alising */
2452 if ( fabs(coeff[9]) < MagickEpsilon )
2455 c = b*b - 2*coeff[9]*c;
2459 s.y = ( -b + sqrt(c) )/coeff[9];
2461 if ( validity > 0.0 )
2462 s.x = ( d.x - coeff[1]*s.y) / ( coeff[0] + coeff[2]*s.y );
2464 /* NOTE: the sign of the square root should be -ve for parts
2465 where the source image becomes 'flipped' or 'mirrored'.
2466 FUTURE: Horizon handling
2467 FUTURE: Scaling factors or Deritives (how?)
2472 case BilinearDistortion:
2473 /* Bilinear mapping of any Quadrilateral to any Quadrilateral */
2474 /* UNDER DEVELOPMENT */
2477 case PolynomialDistortion:
2479 /* multi-ordered polynomial */
2484 nterms=(ssize_t)coeff[1];
2487 du,dv; /* the du,dv vectors from unit dx,dy -- derivatives */
2489 s.x=s.y=du.x=du.y=dv.x=dv.y=0.0;
2490 for(k=0; k < nterms; k++) {
2491 s.x += poly_basis_fn(k,d.x,d.y)*coeff[2+k];
2492 du.x += poly_basis_dx(k,d.x,d.y)*coeff[2+k];
2493 du.y += poly_basis_dy(k,d.x,d.y)*coeff[2+k];
2494 s.y += poly_basis_fn(k,d.x,d.y)*coeff[2+k+nterms];
2495 dv.x += poly_basis_dx(k,d.x,d.y)*coeff[2+k+nterms];
2496 dv.y += poly_basis_dy(k,d.x,d.y)*coeff[2+k+nterms];
2498 ScaleFilter( resample_filter[id], du.x,du.y,dv.x,dv.y );
2503 /* what is the angle and radius in the destination image */
2504 s.x = (double) ((atan2(d.y,d.x) - coeff[0])/Magick2PI);
2505 s.x -= MagickRound(s.x); /* angle */
2506 s.y = hypot(d.x,d.y); /* radius */
2508 /* Arc Distortion Partial Scaling Vectors
2509 Are derived by mapping the perpendicular unit vectors
2510 dR and dA*R*2PI rather than trying to map dx and dy
2511 The results is a very simple orthogonal aligned ellipse.
2513 if ( s.y > MagickEpsilon )
2514 ScaleFilter( resample_filter[id],
2515 (double) (coeff[1]/(Magick2PI*s.y)), 0, 0, coeff[3] );
2517 ScaleFilter( resample_filter[id],
2518 distort_image->columns*2, 0, 0, coeff[3] );
2520 /* now scale the angle and radius for source image lookup point */
2521 s.x = s.x*coeff[1] + coeff[4] + image->page.x +0.5;
2522 s.y = (coeff[2] - s.y) * coeff[3] + image->page.y;
2525 case PolarDistortion:
2526 { /* 2D Cartesain to Polar View */
2529 s.x = atan2(d.x,d.y) - (coeff[4]+coeff[5])/2;
2531 s.x -= MagickRound(s.x);
2532 s.x *= Magick2PI; /* angle - relative to centerline */
2533 s.y = hypot(d.x,d.y); /* radius */
2535 /* Polar Scaling vectors are based on mapping dR and dA vectors
2536 This results in very simple orthogonal scaling vectors
2538 if ( s.y > MagickEpsilon )
2539 ScaleFilter( resample_filter[id],
2540 (double) (coeff[6]/(Magick2PI*s.y)), 0, 0, coeff[7] );
2542 ScaleFilter( resample_filter[id],
2543 distort_image->columns*2, 0, 0, coeff[7] );
2545 /* now finish mapping radius/angle to source x,y coords */
2546 s.x = s.x*coeff[6] + (double)image->columns/2.0 + image->page.x;
2547 s.y = (s.y-coeff[1])*coeff[7] + image->page.y;
2550 case DePolarDistortion:
2551 { /* @D Polar to Carteasain */
2552 /* ignore all destination virtual offsets */
2553 d.x = ((double)i+0.5)*output_scaling*coeff[6]+coeff[4];
2554 d.y = ((double)j+0.5)*output_scaling*coeff[7]+coeff[1];
2555 s.x = d.y*sin(d.x) + coeff[2];
2556 s.y = d.y*cos(d.x) + coeff[3];
2557 /* derivatives are usless - better to use SuperSampling */
2560 case Cylinder2PlaneDistortion:
2561 { /* 3D Cylinder to Tangential Plane */
2563 /* relative to center of distortion */
2564 d.x -= coeff[4]; d.y -= coeff[5];
2565 d.x /= coeff[1]; /* x' = x/r */
2566 ax=atan(d.x); /* aa = atan(x/r) = u/r */
2567 cx=cos(ax); /* cx = cos(atan(x/r)) = 1/sqrt(x^2+u^2) */
2568 s.x = coeff[1]*ax; /* u = r*atan(x/r) */
2569 s.y = d.y*cx; /* v = y*cos(u/r) */
2570 /* derivatives... (see personnal notes) */
2571 ScaleFilter( resample_filter[id],
2572 1.0/(1.0+d.x*d.x), 0.0, -d.x*s.y*cx*cx/coeff[1], s.y/d.y );
2574 if ( i == 0 && j == 0 ) {
2575 fprintf(stderr, "x=%lf y=%lf u=%lf v=%lf\n", d.x*coeff[1], d.y, s.x, s.y);
2576 fprintf(stderr, "phi = %lf\n", (double)(ax * 180.0/MagickPI) );
2577 fprintf(stderr, "du/dx=%lf du/dx=%lf dv/dx=%lf dv/dy=%lf\n",
2578 1.0/(1.0+d.x*d.x), 0.0, -d.x*s.y*cx*cx/coeff[1], s.y/d.y );
2581 /* add center of distortion in source */
2582 s.x += coeff[2]; s.y += coeff[3];
2585 case Plane2CylinderDistortion:
2586 { /* 3D Cylinder to Tangential Plane */
2587 /* relative to center of distortion */
2588 d.x -= coeff[4]; d.y -= coeff[5];
2590 /* is pixel valid - horizon of a infinite Virtual-Pixel Plane
2591 * (see Anthony Thyssen's personal note) */
2592 validity = (double) (coeff[1]*MagickPI2 - fabs(d.x))/output_scaling + 0.5;
2594 if ( validity > 0.0 ) {
2596 d.x /= coeff[1]; /* x'= x/r */
2597 cx = 1/cos(d.x); /* cx = 1/cos(x/r) */
2598 tx = tan(d.x); /* tx = tan(x/r) */
2599 s.x = coeff[1]*tx; /* u = r * tan(x/r) */
2600 s.y = d.y*cx; /* v = y / cos(x/r) */
2601 /* derivatives... (see Anthony Thyssen's personal notes) */
2602 ScaleFilter( resample_filter[id],
2603 cx*cx, 0.0, s.y*cx/coeff[1], cx );
2605 /*if ( i == 0 && j == 0 )*/
2606 if ( d.x == 0.5 && d.y == 0.5 ) {
2607 fprintf(stderr, "x=%lf y=%lf u=%lf v=%lf\n", d.x*coeff[1], d.y, s.x, s.y);
2608 fprintf(stderr, "radius = %lf phi = %lf validity = %lf\n",
2609 coeff[1], (double)(d.x * 180.0/MagickPI), validity );
2610 fprintf(stderr, "du/dx=%lf du/dx=%lf dv/dx=%lf dv/dy=%lf\n",
2611 cx*cx, 0.0, s.y*cx/coeff[1], cx);
2615 /* add center of distortion in source */
2616 s.x += coeff[2]; s.y += coeff[3];
2619 case BarrelDistortion:
2620 case BarrelInverseDistortion:
2621 { /* Lens Barrel Distionion Correction */
2622 double r,fx,fy,gx,gy;
2623 /* Radial Polynomial Distortion (de-normalized) */
2626 r = sqrt(d.x*d.x+d.y*d.y);
2627 if ( r > MagickEpsilon ) {
2628 fx = ((coeff[0]*r + coeff[1])*r + coeff[2])*r + coeff[3];
2629 fy = ((coeff[4]*r + coeff[5])*r + coeff[6])*r + coeff[7];
2630 gx = ((3*coeff[0]*r + 2*coeff[1])*r + coeff[2])/r;
2631 gy = ((3*coeff[4]*r + 2*coeff[5])*r + coeff[6])/r;
2632 /* adjust functions and scaling for 'inverse' form */
2633 if ( method == BarrelInverseDistortion ) {
2634 fx = 1/fx; fy = 1/fy;
2635 gx *= -fx*fx; gy *= -fy*fy;
2637 /* Set the source pixel to lookup and EWA derivative vectors */
2638 s.x = d.x*fx + coeff[8];
2639 s.y = d.y*fy + coeff[9];
2640 ScaleFilter( resample_filter[id],
2641 gx*d.x*d.x + fx, gx*d.x*d.y,
2642 gy*d.x*d.y, gy*d.y*d.y + fy );
2645 /* Special handling to avoid divide by zero when r==0
2647 ** The source and destination pixels match in this case
2648 ** which was set at the top of the loop using s = d;
2649 ** otherwise... s.x=coeff[8]; s.y=coeff[9];
2651 if ( method == BarrelDistortion )
2652 ScaleFilter( resample_filter[id],
2653 coeff[3], 0, 0, coeff[7] );
2654 else /* method == BarrelInverseDistortion */
2655 /* FUTURE, trap for D==0 causing division by zero */
2656 ScaleFilter( resample_filter[id],
2657 1.0/coeff[3], 0, 0, 1.0/coeff[7] );
2661 case ShepardsDistortion:
2662 { /* Shepards Method, or Inverse Weighted Distance for
2663 displacement around the destination image control points
2664 The input arguments are the coefficents to the function.
2665 This is more of a 'displacement' function rather than an
2666 absolute distortion function.
2668 Note: We can not determine derivatives using shepards method
2669 so only a point sample interpolatation can be used.
2676 denominator = s.x = s.y = 0;
2677 for(i=0; i<number_arguments; i+=4) {
2679 ((double)d.x-arguments[i+2])*((double)d.x-arguments[i+2])
2680 + ((double)d.y-arguments[i+3])*((double)d.y-arguments[i+3]);
2681 weight = pow(weight,coeff[0]); /* shepards power factor */
2682 weight = ( weight < 1.0 ) ? 1.0 : 1.0/weight;
2684 s.x += (arguments[ i ]-arguments[i+2])*weight;
2685 s.y += (arguments[i+1]-arguments[i+3])*weight;
2686 denominator += weight;
2690 s.x += d.x; /* make it as relative displacement */
2695 break; /* use the default no-op given above */
2697 /* map virtual canvas location back to real image coordinate */
2698 if ( bestfit && method != ArcDistortion ) {
2699 s.x -= image->page.x;
2700 s.y -= image->page.y;
2705 if ( validity <= 0.0 ) {
2706 /* result of distortion is an invalid pixel - don't resample */
2707 SetPixelViaPixelInfo(distort_image,&invalid,q);
2710 /* resample the source image to find its correct color */
2711 (void) ResamplePixelColor(resample_filter[id],s.x,s.y,&pixel,
2713 /* if validity between 0.0 and 1.0 mix result with invalid pixel */
2714 if ( validity < 1.0 ) {
2715 /* Do a blend of sample color and invalid pixel */
2716 /* should this be a 'Blend', or an 'Over' compose */
2717 CompositePixelInfoBlend(&pixel,validity,&invalid,(1.0-validity),
2720 SetPixelViaPixelInfo(distort_image,&pixel,q);
2722 q+=GetPixelChannels(distort_image);
2724 sync=SyncCacheViewAuthenticPixels(distort_view,exception);
2725 if (sync == MagickFalse)
2727 if (image->progress_monitor != (MagickProgressMonitor) NULL)
2732 #if defined(MAGICKCORE_OPENMP_SUPPORT)
2733 #pragma omp critical (MagickCore_DistortImage)
2735 proceed=SetImageProgress(image,DistortImageTag,progress++,
2737 if (proceed == MagickFalse)
2741 distort_view=DestroyCacheView(distort_view);
2742 resample_filter=DestroyResampleFilterThreadSet(resample_filter);
2744 if (status == MagickFalse)
2745 distort_image=DestroyImage(distort_image);
2748 /* Arc does not return an offset unless 'bestfit' is in effect
2749 And the user has not provided an overriding 'viewport'.
2751 if ( method == ArcDistortion && !bestfit && !viewport_given ) {
2752 distort_image->page.x = 0;
2753 distort_image->page.y = 0;
2755 coeff = (double *) RelinquishMagickMemory(coeff);
2756 return(distort_image);
2760 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
2764 % R o t a t e I m a g e %
2768 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
2770 % RotateImage() creates a new image that is a rotated copy of an existing
2771 % one. Positive angles rotate counter-clockwise (right-hand rule), while
2772 % negative angles rotate clockwise. Rotated images are usually larger than
2773 % the originals and have 'empty' triangular corners. X axis. Empty
2774 % triangles left over from shearing the image are filled with the background
2775 % color defined by member 'background_color' of the image. RotateImage
2776 % allocates the memory necessary for the new Image structure and returns a
2777 % pointer to the new image.
2779 % The format of the RotateImage method is:
2781 % Image *RotateImage(const Image *image,const double degrees,
2782 % ExceptionInfo *exception)
2784 % A description of each parameter follows.
2786 % o image: the image.
2788 % o degrees: Specifies the number of degrees to rotate the image.
2790 % o exception: return any errors or warnings in this structure.
2793 MagickExport Image *RotateImage(const Image *image,const double degrees,
2794 ExceptionInfo *exception)
2810 Adjust rotation angle.
2812 assert(image != (Image *) NULL);
2813 assert(image->signature == MagickSignature);
2814 if (image->debug != MagickFalse)
2815 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
2816 assert(exception != (ExceptionInfo *) NULL);
2817 assert(exception->signature == MagickSignature);
2819 while (angle < -45.0)
2821 for (rotations=0; angle > 45.0; rotations++)
2824 shear.x=(-tan((double) DegreesToRadians(angle)/2.0));
2825 shear.y=sin((double) DegreesToRadians(angle));
2826 if ((fabs(shear.x) < MagickEpsilon) && (fabs(shear.y) < MagickEpsilon))
2827 return(IntegralRotateImage(image,rotations,exception));
2828 distort_image=CloneImage(image,0,0,MagickTrue,exception);
2829 if (distort_image == (Image *) NULL)
2830 return((Image *) NULL);
2831 (void) SetImageVirtualPixelMethod(distort_image,BackgroundVirtualPixelMethod,
2833 rotate_image=DistortImage(distort_image,ScaleRotateTranslateDistortion,1,
2834 °rees,MagickTrue,exception);
2835 distort_image=DestroyImage(distort_image);
2836 return(rotate_image);
2840 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
2844 % S p a r s e C o l o r I m a g e %
2848 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
2850 % SparseColorImage(), given a set of coordinates, interpolates the colors
2851 % found at those coordinates, across the whole image, using various methods.
2853 % The format of the SparseColorImage() method is:
2855 % Image *SparseColorImage(const Image *image,
2856 % const SparseColorMethod method,const size_t number_arguments,
2857 % const double *arguments,ExceptionInfo *exception)
2859 % A description of each parameter follows:
2861 % o image: the image to be filled in.
2863 % o method: the method to fill in the gradient between the control points.
2865 % The methods used for SparseColor() are often simular to methods
2866 % used for DistortImage(), and even share the same code for determination
2867 % of the function coefficents, though with more dimensions (or resulting
2870 % o number_arguments: the number of arguments given.
2872 % o arguments: array of floating point arguments for this method--
2873 % x,y,color_values-- with color_values given as normalized values.
2875 % o exception: return any errors or warnings in this structure
2878 MagickExport Image *SparseColorImage(const Image *image,
2879 const SparseColorMethod method,const size_t number_arguments,
2880 const double *arguments,ExceptionInfo *exception)
2882 #define SparseColorTag "Distort/SparseColor"
2896 assert(image != (Image *) NULL);
2897 assert(image->signature == MagickSignature);
2898 if (image->debug != MagickFalse)
2899 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
2900 assert(exception != (ExceptionInfo *) NULL);
2901 assert(exception->signature == MagickSignature);
2903 /* Determine number of color values needed per control point */
2905 if ((GetPixelRedTraits(image) & UpdatePixelTrait) != 0)
2907 if ((GetPixelGreenTraits(image) & UpdatePixelTrait) != 0)
2909 if ((GetPixelBlueTraits(image) & UpdatePixelTrait) != 0)
2911 if (((GetPixelBlackTraits(image) & UpdatePixelTrait) != 0) &&
2912 (image->colorspace == CMYKColorspace))
2914 if (((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0) &&
2915 (image->alpha_trait != UndefinedPixelTrait))
2919 Convert input arguments into mapping coefficients, this this case
2920 we are mapping (distorting) colors, rather than coordinates.
2922 { DistortImageMethod
2925 distort_method=(DistortImageMethod) method;
2926 if ( distort_method >= SentinelDistortion )
2927 distort_method = ShepardsDistortion; /* Pretend to be Shepards */
2928 coeff = GenerateCoefficients(image, &distort_method, number_arguments,
2929 arguments, number_colors, exception);
2930 if ( coeff == (double *) NULL )
2931 return((Image *) NULL);
2933 Note some Distort Methods may fall back to other simpler methods,
2934 Currently the only fallback of concern is Bilinear to Affine
2935 (Barycentric), which is alaso sparse_colr method. This also ensures
2936 correct two and one color Barycentric handling.
2938 sparse_method = (SparseColorMethod) distort_method;
2939 if ( distort_method == ShepardsDistortion )
2940 sparse_method = method; /* return non-distort methods to normal */
2941 if ( sparse_method == InverseColorInterpolate )
2942 coeff[0]=0.5; /* sqrt() the squared distance for inverse */
2945 /* Verbose output */
2946 if ( IfStringTrue(GetImageArtifact(image,"verbose")) ) {
2948 switch (sparse_method) {
2949 case BarycentricColorInterpolate:
2951 register ssize_t x=0;
2952 (void) FormatLocaleFile(stderr, "Barycentric Sparse Color:\n");
2953 if ((GetPixelRedTraits(image) & UpdatePixelTrait) != 0)
2954 (void) FormatLocaleFile(stderr, " -channel R -fx '%+lf*i %+lf*j %+lf' \\\n",
2955 coeff[x], coeff[x+1], coeff[x+2]),x+=3;
2956 if ((GetPixelGreenTraits(image) & UpdatePixelTrait) != 0)
2957 (void) FormatLocaleFile(stderr, " -channel G -fx '%+lf*i %+lf*j %+lf' \\\n",
2958 coeff[x], coeff[x+1], coeff[x+2]),x+=3;
2959 if ((GetPixelBlueTraits(image) & UpdatePixelTrait) != 0)
2960 (void) FormatLocaleFile(stderr, " -channel B -fx '%+lf*i %+lf*j %+lf' \\\n",
2961 coeff[x], coeff[x+1], coeff[x+2]),x+=3;
2962 if (((GetPixelBlackTraits(image) & UpdatePixelTrait) != 0) &&
2963 (image->colorspace == CMYKColorspace))
2964 (void) FormatLocaleFile(stderr, " -channel K -fx '%+lf*i %+lf*j %+lf' \\\n",
2965 coeff[x], coeff[x+1], coeff[x+2]),x+=3;
2966 if (((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0) &&
2967 (image->alpha_trait != UndefinedPixelTrait))
2968 (void) FormatLocaleFile(stderr, " -channel A -fx '%+lf*i %+lf*j %+lf' \\\n",
2969 coeff[x], coeff[x+1], coeff[x+2]),x+=3;
2972 case BilinearColorInterpolate:
2974 register ssize_t x=0;
2975 (void) FormatLocaleFile(stderr, "Bilinear Sparse Color\n");
2976 if ((GetPixelRedTraits(image) & UpdatePixelTrait) != 0)
2977 (void) FormatLocaleFile(stderr, " -channel R -fx '%+lf*i %+lf*j %+lf*i*j %+lf;\n",
2978 coeff[ x ], coeff[x+1],
2979 coeff[x+2], coeff[x+3]),x+=4;
2980 if ((GetPixelGreenTraits(image) & UpdatePixelTrait) != 0)
2981 (void) FormatLocaleFile(stderr, " -channel G -fx '%+lf*i %+lf*j %+lf*i*j %+lf;\n",
2982 coeff[ x ], coeff[x+1],
2983 coeff[x+2], coeff[x+3]),x+=4;
2984 if ((GetPixelBlueTraits(image) & UpdatePixelTrait) != 0)
2985 (void) FormatLocaleFile(stderr, " -channel B -fx '%+lf*i %+lf*j %+lf*i*j %+lf;\n",
2986 coeff[ x ], coeff[x+1],
2987 coeff[x+2], coeff[x+3]),x+=4;
2988 if (((GetPixelBlackTraits(image) & UpdatePixelTrait) != 0) &&
2989 (image->colorspace == CMYKColorspace))
2990 (void) FormatLocaleFile(stderr, " -channel K -fx '%+lf*i %+lf*j %+lf*i*j %+lf;\n",
2991 coeff[ x ], coeff[x+1],
2992 coeff[x+2], coeff[x+3]),x+=4;
2993 if (((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0) &&
2994 (image->alpha_trait != UndefinedPixelTrait))
2995 (void) FormatLocaleFile(stderr, " -channel A -fx '%+lf*i %+lf*j %+lf*i*j %+lf;\n",
2996 coeff[ x ], coeff[x+1],
2997 coeff[x+2], coeff[x+3]),x+=4;
3001 /* sparse color method is too complex for FX emulation */
3006 /* Generate new image for generated interpolated gradient.
3007 * ASIDE: Actually we could have just replaced the colors of the original
3008 * image, but IM Core policy, is if storage class could change then clone
3012 sparse_image=CloneImage(image,0,0,MagickTrue,exception);
3013 if (sparse_image == (Image *) NULL)
3014 return((Image *) NULL);
3015 if (SetImageStorageClass(sparse_image,DirectClass,exception) == MagickFalse)
3016 { /* if image is ColorMapped - change it to DirectClass */
3017 sparse_image=DestroyImage(sparse_image);
3018 return((Image *) NULL);
3020 { /* ----- MAIN CODE ----- */
3035 sparse_view=AcquireAuthenticCacheView(sparse_image,exception);
3036 #if defined(MAGICKCORE_OPENMP_SUPPORT)
3037 #pragma omp parallel for schedule(static,4) shared(progress,status) \
3038 magick_threads(image,sparse_image,sparse_image->rows,1)
3040 for (j=0; j < (ssize_t) sparse_image->rows; j++)
3046 pixel; /* pixel to assign to distorted image */
3054 q=GetCacheViewAuthenticPixels(sparse_view,0,j,sparse_image->columns,
3056 if (q == (Quantum *) NULL)
3061 GetPixelInfo(sparse_image,&pixel);
3062 for (i=0; i < (ssize_t) image->columns; i++)
3064 GetPixelInfoPixel(image,q,&pixel);
3065 switch (sparse_method)
3067 case BarycentricColorInterpolate:
3069 register ssize_t x=0;
3070 if ((GetPixelRedTraits(image) & UpdatePixelTrait) != 0)
3071 pixel.red = coeff[x]*i +coeff[x+1]*j
3073 if ((GetPixelGreenTraits(image) & UpdatePixelTrait) != 0)
3074 pixel.green = coeff[x]*i +coeff[x+1]*j
3076 if ((GetPixelBlueTraits(image) & UpdatePixelTrait) != 0)
3077 pixel.blue = coeff[x]*i +coeff[x+1]*j
3079 if (((GetPixelBlackTraits(image) & UpdatePixelTrait) != 0) &&
3080 (image->colorspace == CMYKColorspace))
3081 pixel.black = coeff[x]*i +coeff[x+1]*j
3083 if (((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0) &&
3084 (image->alpha_trait != UndefinedPixelTrait))
3085 pixel.alpha = coeff[x]*i +coeff[x+1]*j
3089 case BilinearColorInterpolate:
3091 register ssize_t x=0;
3092 if ((GetPixelRedTraits(image) & UpdatePixelTrait) != 0)
3093 pixel.red = coeff[x]*i + coeff[x+1]*j +
3094 coeff[x+2]*i*j + coeff[x+3], x+=4;
3095 if ((GetPixelGreenTraits(image) & UpdatePixelTrait) != 0)
3096 pixel.green = coeff[x]*i + coeff[x+1]*j +
3097 coeff[x+2]*i*j + coeff[x+3], x+=4;
3098 if ((GetPixelBlueTraits(image) & UpdatePixelTrait) != 0)
3099 pixel.blue = coeff[x]*i + coeff[x+1]*j +
3100 coeff[x+2]*i*j + coeff[x+3], x+=4;
3101 if (((GetPixelBlackTraits(image) & UpdatePixelTrait) != 0) &&
3102 (image->colorspace == CMYKColorspace))
3103 pixel.black = coeff[x]*i + coeff[x+1]*j +
3104 coeff[x+2]*i*j + coeff[x+3], x+=4;
3105 if (((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0) &&
3106 (image->alpha_trait != UndefinedPixelTrait))
3107 pixel.alpha = coeff[x]*i + coeff[x+1]*j +
3108 coeff[x+2]*i*j + coeff[x+3], x+=4;
3111 case InverseColorInterpolate:
3112 case ShepardsColorInterpolate:
3113 { /* Inverse (Squared) Distance weights average (IDW) */
3119 if ((GetPixelRedTraits(image) & UpdatePixelTrait) != 0)
3121 if ((GetPixelGreenTraits(image) & UpdatePixelTrait) != 0)
3123 if ((GetPixelBlueTraits(image) & UpdatePixelTrait) != 0)
3125 if (((GetPixelBlackTraits(image) & UpdatePixelTrait) != 0) &&
3126 (image->colorspace == CMYKColorspace))
3128 if (((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0) &&
3129 (image->alpha_trait != UndefinedPixelTrait))
3132 for(k=0; k<number_arguments; k+=2+number_colors) {
3133 register ssize_t x=(ssize_t) k+2;
3135 ((double)i-arguments[ k ])*((double)i-arguments[ k ])
3136 + ((double)j-arguments[k+1])*((double)j-arguments[k+1]);
3137 weight = pow(weight,coeff[0]); /* inverse of power factor */
3138 weight = ( weight < 1.0 ) ? 1.0 : 1.0/weight;
3139 if ((GetPixelRedTraits(image) & UpdatePixelTrait) != 0)
3140 pixel.red += arguments[x++]*weight;
3141 if ((GetPixelGreenTraits(image) & UpdatePixelTrait) != 0)
3142 pixel.green += arguments[x++]*weight;
3143 if ((GetPixelBlueTraits(image) & UpdatePixelTrait) != 0)
3144 pixel.blue += arguments[x++]*weight;
3145 if (((GetPixelBlackTraits(image) & UpdatePixelTrait) != 0) &&
3146 (image->colorspace == CMYKColorspace))
3147 pixel.black += arguments[x++]*weight;
3148 if (((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0) &&
3149 (image->alpha_trait != UndefinedPixelTrait))
3150 pixel.alpha += arguments[x++]*weight;
3151 denominator += weight;
3153 if ((GetPixelRedTraits(image) & UpdatePixelTrait) != 0)
3154 pixel.red/=denominator;
3155 if ((GetPixelGreenTraits(image) & UpdatePixelTrait) != 0)
3156 pixel.green/=denominator;
3157 if ((GetPixelBlueTraits(image) & UpdatePixelTrait) != 0)
3158 pixel.blue/=denominator;
3159 if (((GetPixelBlackTraits(image) & UpdatePixelTrait) != 0) &&
3160 (image->colorspace == CMYKColorspace))
3161 pixel.black/=denominator;
3162 if (((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0) &&
3163 (image->alpha_trait != UndefinedPixelTrait))
3164 pixel.alpha/=denominator;
3167 case VoronoiColorInterpolate:
3174 minimum = MagickMaximumValue;
3177 Just use the closest control point you can find!
3179 for (k=0; k<number_arguments; k+=2+number_colors) {
3181 ((double)i-arguments[ k ])*((double)i-arguments[ k ])
3182 + ((double)j-arguments[k+1])*((double)j-arguments[k+1]);
3183 if ( distance < minimum ) {
3184 register ssize_t x=(ssize_t) k+2;
3185 if ((GetPixelRedTraits(image) & UpdatePixelTrait) != 0)
3186 pixel.red=arguments[x++];
3187 if ((GetPixelGreenTraits(image) & UpdatePixelTrait) != 0)
3188 pixel.green=arguments[x++];
3189 if ((GetPixelBlueTraits(image) & UpdatePixelTrait) != 0)
3190 pixel.blue=arguments[x++];
3191 if (((GetPixelBlackTraits(image) & UpdatePixelTrait) != 0) &&
3192 (image->colorspace == CMYKColorspace))
3193 pixel.black=arguments[x++];
3194 if (((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0) &&
3195 (image->alpha_trait != UndefinedPixelTrait))
3196 pixel.alpha=arguments[x++];
3203 /* set the color directly back into the source image */
3204 if ((GetPixelRedTraits(image) & UpdatePixelTrait) != 0)
3205 pixel.red=ClampPixel(QuantumRange*pixel.red);
3206 if ((GetPixelGreenTraits(image) & UpdatePixelTrait) != 0)
3207 pixel.green=ClampPixel(QuantumRange*pixel.green);
3208 if ((GetPixelBlueTraits(image) & UpdatePixelTrait) != 0)
3209 pixel.blue=ClampPixel(QuantumRange*pixel.blue);
3210 if (((GetPixelBlackTraits(image) & UpdatePixelTrait) != 0) &&
3211 (image->colorspace == CMYKColorspace))
3212 pixel.black=ClampPixel(QuantumRange*pixel.black);
3213 if (((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0) &&
3214 (image->alpha_trait != UndefinedPixelTrait))
3215 pixel.alpha=ClampPixel(QuantumRange*pixel.alpha);
3216 SetPixelViaPixelInfo(sparse_image,&pixel,q);
3217 q+=GetPixelChannels(sparse_image);
3219 sync=SyncCacheViewAuthenticPixels(sparse_view,exception);
3220 if (sync == MagickFalse)
3222 if (image->progress_monitor != (MagickProgressMonitor) NULL)
3227 #if defined(MAGICKCORE_OPENMP_SUPPORT)
3228 #pragma omp critical (MagickCore_SparseColorImage)
3230 proceed=SetImageProgress(image,SparseColorTag,progress++,image->rows);
3231 if (proceed == MagickFalse)
3235 sparse_view=DestroyCacheView(sparse_view);
3236 if (status == MagickFalse)
3237 sparse_image=DestroyImage(sparse_image);
3239 coeff = (double *) RelinquishMagickMemory(coeff);
3240 return(sparse_image);