1 /*
2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 % %
4 % %
5 % %
6 % H H DDDD RRRR %
7 % H H D D R R %
8 % HHHHH D D RRRR %
9 % H H D D R R %
10 % H H DDDD R R %
11 % %
12 % %
13 % Read/Write Radiance RGBE Image Format %
14 % %
15 % Software Design %
16 % Cristy %
17 % July 1992 %
18 % %
19 % %
20 % Copyright 1999-2016 ImageMagick Studio LLC, a non-profit organization %
21 % dedicated to making software imaging solutions freely available. %
22 % %
23 % You may not use this file except in compliance with the License. You may %
24 % obtain a copy of the License at %
25 % %
26 % http://www.imagemagick.org/script/license.php %
27 % %
28 % Unless required by applicable law or agreed to in writing, software %
29 % distributed under the License is distributed on an "AS IS" BASIS, %
30 % WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
31 % See the License for the specific language governing permissions and %
32 % limitations under the License. %
33 % %
34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
35 %
36 %
37 */
38
39 /*
40 Include declarations.
41 */
42 #include "MagickCore/studio.h"
43 #include "MagickCore/blob.h"
44 #include "MagickCore/blob-private.h"
45 #include "MagickCore/cache.h"
46 #include "MagickCore/colorspace.h"
47 #include "MagickCore/colorspace-private.h"
48 #include "MagickCore/exception.h"
49 #include "MagickCore/exception-private.h"
50 #include "MagickCore/image.h"
51 #include "MagickCore/image-private.h"
52 #include "MagickCore/list.h"
53 #include "MagickCore/magick.h"
54 #include "MagickCore/memory_.h"
55 #include "MagickCore/monitor.h"
56 #include "MagickCore/monitor-private.h"
57 #include "MagickCore/pixel-accessor.h"
58 #include "MagickCore/property.h"
59 #include "MagickCore/quantum-private.h"
60 #include "MagickCore/static.h"
61 #include "MagickCore/string_.h"
62 #include "MagickCore/string-private.h"
63 #include "MagickCore/module.h"
64
65 /*
66 Forward declarations.
67 */
68 static MagickBooleanType
69 WriteHDRImage(const ImageInfo *,Image *,ExceptionInfo *);
70
71 /*
72 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
73 % %
74 % %
75 % %
76 % I s H D R %
77 % %
78 % %
79 % %
80 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
81 %
82 % IsHDR() returns MagickTrue if the image format type, identified by the
83 % magick string, is Radiance RGBE image format.
84 %
85 % The format of the IsHDR method is:
86 %
87 % MagickBooleanType IsHDR(const unsigned char *magick,
88 % const size_t length)
89 %
90 % A description of each parameter follows:
91 %
92 % o magick: compare image format pattern against these bytes.
93 %
94 % o length: Specifies the length of the magick string.
95 %
96 */
IsHDR(const unsigned char * magick,const size_t length)97 static MagickBooleanType IsHDR(const unsigned char *magick,
98 const size_t length)
99 {
100 if (length < 10)
101 return(MagickFalse);
102 if (LocaleNCompare((const char *) magick,"#?RADIANCE",10) == 0)
103 return(MagickTrue);
104 if (LocaleNCompare((const char *) magick,"#?RGBE",6) == 0)
105 return(MagickTrue);
106 return(MagickFalse);
107 }
108
109 /*
110 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
111 % %
112 % %
113 % %
114 % R e a d H D R I m a g e %
115 % %
116 % %
117 % %
118 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
119 %
120 % ReadHDRImage() reads the Radiance RGBE image format and returns it. It
121 % allocates the memory necessary for the new Image structure and returns a
122 % pointer to the new image.
123 %
124 % The format of the ReadHDRImage method is:
125 %
126 % Image *ReadHDRImage(const ImageInfo *image_info,ExceptionInfo *exception)
127 %
128 % A description of each parameter follows:
129 %
130 % o image_info: the image info.
131 %
132 % o exception: return any errors or warnings in this structure.
133 %
134 */
ReadHDRImage(const ImageInfo * image_info,ExceptionInfo * exception)135 static Image *ReadHDRImage(const ImageInfo *image_info,ExceptionInfo *exception)
136 {
137 char
138 format[MagickPathExtent],
139 keyword[MagickPathExtent],
140 tag[MagickPathExtent],
141 value[MagickPathExtent];
142
143 double
144 gamma;
145
146 Image
147 *image;
148
149 int
150 c;
151
152 MagickBooleanType
153 status,
154 value_expected;
155
156 register Quantum
157 *q;
158
159 register ssize_t
160 i,
161 x;
162
163 register unsigned char
164 *p;
165
166 ssize_t
167 count,
168 y;
169
170 unsigned char
171 *end,
172 pixel[4],
173 *pixels;
174
175 /*
176 Open image file.
177 */
178 assert(image_info != (const ImageInfo *) NULL);
179 assert(image_info->signature == MagickCoreSignature);
180 if (image_info->debug != MagickFalse)
181 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
182 image_info->filename);
183 assert(exception != (ExceptionInfo *) NULL);
184 assert(exception->signature == MagickCoreSignature);
185 image=AcquireImage(image_info,exception);
186 status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
187 if (status == MagickFalse)
188 {
189 image=DestroyImageList(image);
190 return((Image *) NULL);
191 }
192 /*
193 Decode image header.
194 */
195 image->columns=0;
196 image->rows=0;
197 *format='\0';
198 c=ReadBlobByte(image);
199 if (c == EOF)
200 {
201 image=DestroyImage(image);
202 return((Image *) NULL);
203 }
204 while (isgraph(c) && (image->columns == 0) && (image->rows == 0))
205 {
206 if (c == (int) '#')
207 {
208 char
209 *comment;
210
211 register char
212 *p;
213
214 size_t
215 length;
216
217 /*
218 Read comment-- any text between # and end-of-line.
219 */
220 length=MagickPathExtent;
221 comment=AcquireString((char *) NULL);
222 for (p=comment; comment != (char *) NULL; p++)
223 {
224 c=ReadBlobByte(image);
225 if ((c == EOF) || (c == (int) '\n'))
226 break;
227 if ((size_t) (p-comment+1) >= length)
228 {
229 *p='\0';
230 length<<=1;
231 comment=(char *) ResizeQuantumMemory(comment,length+
232 MagickPathExtent,sizeof(*comment));
233 if (comment == (char *) NULL)
234 break;
235 p=comment+strlen(comment);
236 }
237 *p=(char) c;
238 }
239 if (comment == (char *) NULL)
240 ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
241 *p='\0';
242 (void) SetImageProperty(image,"comment",comment,exception);
243 comment=DestroyString(comment);
244 c=ReadBlobByte(image);
245 }
246 else
247 if (isalnum(c) == MagickFalse)
248 c=ReadBlobByte(image);
249 else
250 {
251 register char
252 *p;
253
254 /*
255 Determine a keyword and its value.
256 */
257 p=keyword;
258 do
259 {
260 if ((size_t) (p-keyword) < (MagickPathExtent-1))
261 *p++=c;
262 c=ReadBlobByte(image);
263 } while (isalnum(c) || (c == '_'));
264 *p='\0';
265 value_expected=MagickFalse;
266 while ((isspace((int) ((unsigned char) c)) != 0) || (c == '='))
267 {
268 if (c == '=')
269 value_expected=MagickTrue;
270 c=ReadBlobByte(image);
271 }
272 if (LocaleCompare(keyword,"Y") == 0)
273 value_expected=MagickTrue;
274 if (value_expected == MagickFalse)
275 continue;
276 p=value;
277 while ((c != '\n') && (c != '\0') && (c != EOF))
278 {
279 if ((size_t) (p-value) < (MagickPathExtent-1))
280 *p++=c;
281 c=ReadBlobByte(image);
282 }
283 *p='\0';
284 /*
285 Assign a value to the specified keyword.
286 */
287 switch (*keyword)
288 {
289 case 'F':
290 case 'f':
291 {
292 if (LocaleCompare(keyword,"format") == 0)
293 {
294 (void) CopyMagickString(format,value,MagickPathExtent);
295 break;
296 }
297 (void) FormatLocaleString(tag,MagickPathExtent,"hdr:%s",keyword);
298 (void) SetImageProperty(image,tag,value,exception);
299 break;
300 }
301 case 'G':
302 case 'g':
303 {
304 if (LocaleCompare(keyword,"gamma") == 0)
305 {
306 image->gamma=StringToDouble(value,(char **) NULL);
307 break;
308 }
309 (void) FormatLocaleString(tag,MagickPathExtent,"hdr:%s",keyword);
310 (void) SetImageProperty(image,tag,value,exception);
311 break;
312 }
313 case 'P':
314 case 'p':
315 {
316 if (LocaleCompare(keyword,"primaries") == 0)
317 {
318 float
319 chromaticity[6],
320 white_point[2];
321
322 int
323 count;
324
325 count=sscanf(value,"%g %g %g %g %g %g %g %g",&chromaticity[0],
326 &chromaticity[1],&chromaticity[2],&chromaticity[3],
327 &chromaticity[4],&chromaticity[5],&white_point[0],
328 &white_point[1]);
329 if (count == 8)
330 {
331 image->chromaticity.red_primary.x=chromaticity[0];
332 image->chromaticity.red_primary.y=chromaticity[1];
333 image->chromaticity.green_primary.x=chromaticity[2];
334 image->chromaticity.green_primary.y=chromaticity[3];
335 image->chromaticity.blue_primary.x=chromaticity[4];
336 image->chromaticity.blue_primary.y=chromaticity[5];
337 image->chromaticity.white_point.x=white_point[0],
338 image->chromaticity.white_point.y=white_point[1];
339 }
340 break;
341 }
342 (void) FormatLocaleString(tag,MagickPathExtent,"hdr:%s",keyword);
343 (void) SetImageProperty(image,tag,value,exception);
344 break;
345 }
346 case 'Y':
347 case 'y':
348 {
349 char
350 target[] = "Y";
351
352 if (strcmp(keyword,target) == 0)
353 {
354 int
355 height,
356 width;
357
358 if (sscanf(value,"%d +X %d",&height,&width) == 2)
359 {
360 image->columns=(size_t) width;
361 image->rows=(size_t) height;
362 }
363 break;
364 }
365 (void) FormatLocaleString(tag,MagickPathExtent,"hdr:%s",keyword);
366 (void) SetImageProperty(image,tag,value,exception);
367 break;
368 }
369 default:
370 {
371 (void) FormatLocaleString(tag,MagickPathExtent,"hdr:%s",keyword);
372 (void) SetImageProperty(image,tag,value,exception);
373 break;
374 }
375 }
376 }
377 if ((image->columns == 0) && (image->rows == 0))
378 while (isspace((int) ((unsigned char) c)) != 0)
379 c=ReadBlobByte(image);
380 }
381 if ((LocaleCompare(format,"32-bit_rle_rgbe") != 0) &&
382 (LocaleCompare(format,"32-bit_rle_xyze") != 0))
383 ThrowReaderException(CorruptImageError,"ImproperImageHeader");
384 if ((image->columns == 0) || (image->rows == 0))
385 ThrowReaderException(CorruptImageError,"NegativeOrZeroImageSize");
386 (void) SetImageColorspace(image,RGBColorspace,exception);
387 if (LocaleCompare(format,"32-bit_rle_xyze") == 0)
388 (void) SetImageColorspace(image,XYZColorspace,exception);
389 image->compression=(image->columns < 8) || (image->columns > 0x7ffff) ?
390 NoCompression : RLECompression;
391 if (image_info->ping != MagickFalse)
392 {
393 (void) CloseBlob(image);
394 return(GetFirstImageInList(image));
395 }
396 status=SetImageExtent(image,image->columns,image->rows,exception);
397 if (status == MagickFalse)
398 return(DestroyImageList(image));
399 /*
400 Read RGBE (red+green+blue+exponent) pixels.
401 */
402 pixels=(unsigned char *) AcquireQuantumMemory(image->columns,4*
403 sizeof(*pixels));
404 if (pixels == (unsigned char *) NULL)
405 ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
406 for (y=0; y < (ssize_t) image->rows; y++)
407 {
408 if (image->compression != RLECompression)
409 {
410 count=ReadBlob(image,4*image->columns*sizeof(*pixels),pixels);
411 if (count != (ssize_t) (4*image->columns*sizeof(*pixels)))
412 break;
413 }
414 else
415 {
416 count=ReadBlob(image,4*sizeof(*pixel),pixel);
417 if (count != 4)
418 break;
419 if ((size_t) ((((size_t) pixel[2]) << 8) | pixel[3]) != image->columns)
420 {
421 (void) memcpy(pixels,pixel,4*sizeof(*pixel));
422 count=ReadBlob(image,4*(image->columns-1)*sizeof(*pixels),pixels+4);
423 image->compression=NoCompression;
424 }
425 else
426 {
427 p=pixels;
428 for (i=0; i < 4; i++)
429 {
430 end=&pixels[(i+1)*image->columns];
431 while (p < end)
432 {
433 count=ReadBlob(image,2*sizeof(*pixel),pixel);
434 if (count < 1)
435 break;
436 if (pixel[0] > 128)
437 {
438 count=(ssize_t) pixel[0]-128;
439 if ((count == 0) || (count > (ssize_t) (end-p)))
440 break;
441 while (count-- > 0)
442 *p++=pixel[1];
443 }
444 else
445 {
446 count=(ssize_t) pixel[0];
447 if ((count == 0) || (count > (ssize_t) (end-p)))
448 break;
449 *p++=pixel[1];
450 if (--count > 0)
451 {
452 count=ReadBlob(image,(size_t) count*sizeof(*p),p);
453 if (count < 1)
454 break;
455 p+=count;
456 }
457 }
458 }
459 }
460 }
461 }
462 q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
463 if (q == (Quantum *) NULL)
464 break;
465 i=0;
466 for (x=0; x < (ssize_t) image->columns; x++)
467 {
468 if (image->compression == RLECompression)
469 {
470 pixel[0]=pixels[x];
471 pixel[1]=pixels[x+image->columns];
472 pixel[2]=pixels[x+2*image->columns];
473 pixel[3]=pixels[x+3*image->columns];
474 }
475 else
476 {
477 pixel[0]=pixels[i++];
478 pixel[1]=pixels[i++];
479 pixel[2]=pixels[i++];
480 pixel[3]=pixels[i++];
481 }
482 SetPixelRed(image,0,q);
483 SetPixelGreen(image,0,q);
484 SetPixelBlue(image,0,q);
485 if (pixel[3] != 0)
486 {
487 gamma=pow(2.0,pixel[3]-(128.0+8.0));
488 SetPixelRed(image,ClampToQuantum(QuantumRange*gamma*pixel[0]),q);
489 SetPixelGreen(image,ClampToQuantum(QuantumRange*gamma*pixel[1]),q);
490 SetPixelBlue(image,ClampToQuantum(QuantumRange*gamma*pixel[2]),q);
491 }
492 q+=GetPixelChannels(image);
493 }
494 if (SyncAuthenticPixels(image,exception) == MagickFalse)
495 break;
496 status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
497 image->rows);
498 if (status == MagickFalse)
499 break;
500 }
501 pixels=(unsigned char *) RelinquishMagickMemory(pixels);
502 if (EOFBlob(image) != MagickFalse)
503 ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
504 image->filename);
505 (void) CloseBlob(image);
506 return(GetFirstImageInList(image));
507 }
508
509 /*
510 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
511 % %
512 % %
513 % %
514 % R e g i s t e r H D R I m a g e %
515 % %
516 % %
517 % %
518 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
519 %
520 % RegisterHDRImage() adds attributes for the Radiance RGBE image format to the
521 % list of supported formats. The attributes include the image format tag, a
522 % method to read and/or write the format, whether the format supports the
523 % saving of more than one frame to the same file or blob, whether the format
524 % supports native in-memory I/O, and a brief description of the format.
525 %
526 % The format of the RegisterHDRImage method is:
527 %
528 % size_t RegisterHDRImage(void)
529 %
530 */
RegisterHDRImage(void)531 ModuleExport size_t RegisterHDRImage(void)
532 {
533 MagickInfo
534 *entry;
535
536 entry=AcquireMagickInfo("HDR","HDR","Radiance RGBE image format");
537 entry->decoder=(DecodeImageHandler *) ReadHDRImage;
538 entry->encoder=(EncodeImageHandler *) WriteHDRImage;
539 entry->magick=(IsImageFormatHandler *) IsHDR;
540 (void) RegisterMagickInfo(entry);
541 return(MagickImageCoderSignature);
542 }
543
544 /*
545 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
546 % %
547 % %
548 % %
549 % U n r e g i s t e r H D R I m a g e %
550 % %
551 % %
552 % %
553 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
554 %
555 % UnregisterHDRImage() removes format registrations made by the
556 % HDR module from the list of supported formats.
557 %
558 % The format of the UnregisterHDRImage method is:
559 %
560 % UnregisterHDRImage(void)
561 %
562 */
UnregisterHDRImage(void)563 ModuleExport void UnregisterHDRImage(void)
564 {
565 (void) UnregisterMagickInfo("HDR");
566 }
567
568 /*
569 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
570 % %
571 % %
572 % %
573 % W r i t e H D R I m a g e %
574 % %
575 % %
576 % %
577 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
578 %
579 % WriteHDRImage() writes an image in the Radience RGBE image format.
580 %
581 % The format of the WriteHDRImage method is:
582 %
583 % MagickBooleanType WriteHDRImage(const ImageInfo *image_info,
584 % Image *image,ExceptionInfo *exception)
585 %
586 % A description of each parameter follows.
587 %
588 % o image_info: the image info.
589 %
590 % o image: The image.
591 %
592 */
593
HDRWriteRunlengthPixels(Image * image,unsigned char * pixels)594 static size_t HDRWriteRunlengthPixels(Image *image,unsigned char *pixels)
595 {
596 #define MinimumRunlength 4
597
598 register size_t
599 p,
600 q;
601
602 size_t
603 runlength;
604
605 ssize_t
606 count,
607 previous_count;
608
609 unsigned char
610 pixel[2];
611
612 for (p=0; p < image->columns; )
613 {
614 q=p;
615 runlength=0;
616 previous_count=0;
617 while ((runlength < MinimumRunlength) && (q < image->columns))
618 {
619 q+=runlength;
620 previous_count=(ssize_t) runlength;
621 runlength=1;
622 while ((pixels[q] == pixels[q+runlength]) &&
623 ((q+runlength) < image->columns) && (runlength < 127))
624 runlength++;
625 }
626 if ((previous_count > 1) && (previous_count == (ssize_t) (q-p)))
627 {
628 pixel[0]=(unsigned char) (128+previous_count);
629 pixel[1]=pixels[p];
630 if (WriteBlob(image,2*sizeof(*pixel),pixel) < 1)
631 break;
632 p=q;
633 }
634 while (p < q)
635 {
636 count=(ssize_t) (q-p);
637 if (count > 128)
638 count=128;
639 pixel[0]=(unsigned char) count;
640 if (WriteBlob(image,sizeof(*pixel),pixel) < 1)
641 break;
642 if (WriteBlob(image,(size_t) count*sizeof(*pixel),&pixels[p]) < 1)
643 break;
644 p+=count;
645 }
646 if (runlength >= MinimumRunlength)
647 {
648 pixel[0]=(unsigned char) (128+runlength);
649 pixel[1]=pixels[q];
650 if (WriteBlob(image,2*sizeof(*pixel),pixel) < 1)
651 break;
652 p+=runlength;
653 }
654 }
655 return(p);
656 }
657
WriteHDRImage(const ImageInfo * image_info,Image * image,ExceptionInfo * exception)658 static MagickBooleanType WriteHDRImage(const ImageInfo *image_info,Image *image,
659 ExceptionInfo *exception)
660 {
661 char
662 header[MagickPathExtent];
663
664 const char
665 *property;
666
667 MagickBooleanType
668 status;
669
670 register const Quantum
671 *p;
672
673 register ssize_t
674 i,
675 x;
676
677 size_t
678 length;
679
680 ssize_t
681 count,
682 y;
683
684 unsigned char
685 pixel[4],
686 *pixels;
687
688 /*
689 Open output image file.
690 */
691 assert(image_info != (const ImageInfo *) NULL);
692 assert(image_info->signature == MagickCoreSignature);
693 assert(image != (Image *) NULL);
694 assert(image->signature == MagickCoreSignature);
695 if (image->debug != MagickFalse)
696 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
697 assert(exception != (ExceptionInfo *) NULL);
698 assert(exception->signature == MagickCoreSignature);
699 status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
700 if (status == MagickFalse)
701 return(status);
702 if (IsRGBColorspace(image->colorspace) == MagickFalse)
703 (void) TransformImageColorspace(image,RGBColorspace,exception);
704 /*
705 Write header.
706 */
707 (void) ResetMagickMemory(header,' ',MagickPathExtent);
708 length=CopyMagickString(header,"#?RGBE\n",MagickPathExtent);
709 (void) WriteBlob(image,length,(unsigned char *) header);
710 property=GetImageProperty(image,"comment",exception);
711 if ((property != (const char *) NULL) &&
712 (strchr(property,'\n') == (char *) NULL))
713 {
714 count=FormatLocaleString(header,MagickPathExtent,"#%s\n",property);
715 (void) WriteBlob(image,(size_t) count,(unsigned char *) header);
716 }
717 property=GetImageProperty(image,"hdr:exposure",exception);
718 if (property != (const char *) NULL)
719 {
720 count=FormatLocaleString(header,MagickPathExtent,"EXPOSURE=%g\n",
721 strtod(property,(char **) NULL));
722 (void) WriteBlob(image,(size_t) count,(unsigned char *) header);
723 }
724 if (image->gamma != 0.0)
725 {
726 count=FormatLocaleString(header,MagickPathExtent,"GAMMA=%g\n",
727 image->gamma);
728 (void) WriteBlob(image,(size_t) count,(unsigned char *) header);
729 }
730 count=FormatLocaleString(header,MagickPathExtent,
731 "PRIMARIES=%g %g %g %g %g %g %g %g\n",
732 image->chromaticity.red_primary.x,image->chromaticity.red_primary.y,
733 image->chromaticity.green_primary.x,image->chromaticity.green_primary.y,
734 image->chromaticity.blue_primary.x,image->chromaticity.blue_primary.y,
735 image->chromaticity.white_point.x,image->chromaticity.white_point.y);
736 (void) WriteBlob(image,(size_t) count,(unsigned char *) header);
737 length=CopyMagickString(header,"FORMAT=32-bit_rle_rgbe\n\n",MagickPathExtent);
738 (void) WriteBlob(image,length,(unsigned char *) header);
739 count=FormatLocaleString(header,MagickPathExtent,"-Y %.20g +X %.20g\n",
740 (double) image->rows,(double) image->columns);
741 (void) WriteBlob(image,(size_t) count,(unsigned char *) header);
742 /*
743 Write HDR pixels.
744 */
745 pixels=(unsigned char *) AcquireQuantumMemory(image->columns+128,4*
746 sizeof(*pixels));
747 if (pixels == (unsigned char *) NULL)
748 ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
749 (void) ResetMagickMemory(pixels,0,4*(image->columns+128)*sizeof(*pixels));
750 for (y=0; y < (ssize_t) image->rows; y++)
751 {
752 p=GetVirtualPixels(image,0,y,image->columns,1,exception);
753 if (p == (const Quantum *) NULL)
754 break;
755 if ((image->columns >= 8) && (image->columns <= 0x7ffff))
756 {
757 pixel[0]=2;
758 pixel[1]=2;
759 pixel[2]=(unsigned char) (image->columns >> 8);
760 pixel[3]=(unsigned char) (image->columns & 0xff);
761 count=WriteBlob(image,4*sizeof(*pixel),pixel);
762 if (count != (ssize_t) (4*sizeof(*pixel)))
763 break;
764 }
765 i=0;
766 for (x=0; x < (ssize_t) image->columns; x++)
767 {
768 double
769 gamma;
770
771 pixel[0]=0;
772 pixel[1]=0;
773 pixel[2]=0;
774 pixel[3]=0;
775 gamma=QuantumScale*GetPixelRed(image,p);
776 if ((QuantumScale*GetPixelGreen(image,p)) > gamma)
777 gamma=QuantumScale*GetPixelGreen(image,p);
778 if ((QuantumScale*GetPixelBlue(image,p)) > gamma)
779 gamma=QuantumScale*GetPixelBlue(image,p);
780 if (gamma > MagickEpsilon)
781 {
782 int
783 exponent;
784
785 gamma=frexp(gamma,&exponent)*256.0/gamma;
786 pixel[0]=(unsigned char) (gamma*QuantumScale*GetPixelRed(image,p));
787 pixel[1]=(unsigned char) (gamma*QuantumScale*GetPixelGreen(image,p));
788 pixel[2]=(unsigned char) (gamma*QuantumScale*GetPixelBlue(image,p));
789 pixel[3]=(unsigned char) (exponent+128);
790 }
791 if ((image->columns >= 8) && (image->columns <= 0x7ffff))
792 {
793 pixels[x]=pixel[0];
794 pixels[x+image->columns]=pixel[1];
795 pixels[x+2*image->columns]=pixel[2];
796 pixels[x+3*image->columns]=pixel[3];
797 }
798 else
799 {
800 pixels[i++]=pixel[0];
801 pixels[i++]=pixel[1];
802 pixels[i++]=pixel[2];
803 pixels[i++]=pixel[3];
804 }
805 p+=GetPixelChannels(image);
806 }
807 if ((image->columns >= 8) && (image->columns <= 0x7ffff))
808 {
809 for (i=0; i < 4; i++)
810 length=HDRWriteRunlengthPixels(image,&pixels[i*image->columns]);
811 }
812 else
813 {
814 count=WriteBlob(image,4*image->columns*sizeof(*pixels),pixels);
815 if (count != (ssize_t) (4*image->columns*sizeof(*pixels)))
816 break;
817 }
818 status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
819 image->rows);
820 if (status == MagickFalse)
821 break;
822 }
823 pixels=(unsigned char *) RelinquishMagickMemory(pixels);
824 (void) CloseBlob(image);
825 return(MagickTrue);
826 }
827