1 /*
2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 % %
4 % %
5 % %
6 % EEEEE X X RRRR %
7 % E X X R R %
8 % EEE X RRRR %
9 % E X X R R %
10 % EEEEE X X R R %
11 % %
12 % %
13 % Read/Write High Dynamic-Range (HDR) Image File Format %
14 % %
15 % Software Design %
16 % Cristy %
17 % April 2007 %
18 % %
19 % %
20 % Copyright 1999-2021 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 % https://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/exception.h"
47 #include "MagickCore/exception-private.h"
48 #include "MagickCore/image.h"
49 #include "MagickCore/image-private.h"
50 #include "MagickCore/list.h"
51 #include "MagickCore/magick.h"
52 #include "MagickCore/memory_.h"
53 #include "MagickCore/option.h"
54 #include "MagickCore/pixel-accessor.h"
55 #include "MagickCore/property.h"
56 #include "MagickCore/quantum-private.h"
57 #include "MagickCore/static.h"
58 #include "MagickCore/string_.h"
59 #include "MagickCore/module.h"
60 #include "MagickCore/resource_.h"
61 #include "MagickCore/utility.h"
62 #if defined(MAGICKCORE_OPENEXR_DELEGATE)
63 #include <ImfCRgbaFile.h>
64 #if IMF_VERSION_NUMBER > 1
65 #include <OpenEXRConfig.h>
66 #endif
67
68 /*
69 Typedef declaractions.
70 */
71 typedef struct _EXRWindowInfo
72 {
73 int
74 max_x,
75 max_y,
76 min_x,
77 min_y;
78 } EXRWindowInfo;
79
80 /*
81 Forward declarations.
82 */
83 static MagickBooleanType
84 WriteEXRImage(const ImageInfo *,Image *,ExceptionInfo *);
85 #endif
86
87 /*
88 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
89 % %
90 % %
91 % %
92 % I s E X R %
93 % %
94 % %
95 % %
96 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
97 %
98 % IsEXR() returns MagickTrue if the image format type, identified by the
99 % magick string, is EXR.
100 %
101 % The format of the IsEXR method is:
102 %
103 % MagickBooleanType IsEXR(const unsigned char *magick,const size_t length)
104 %
105 % A description of each parameter follows:
106 %
107 % o magick: compare image format pattern against these bytes.
108 %
109 % o length: Specifies the length of the magick string.
110 %
111 */
IsEXR(const unsigned char * magick,const size_t length)112 static MagickBooleanType IsEXR(const unsigned char *magick,const size_t length)
113 {
114 if (length < 4)
115 return(MagickFalse);
116 if (memcmp(magick,"\166\057\061\001",4) == 0)
117 return(MagickTrue);
118 return(MagickFalse);
119 }
120
121 #if defined(MAGICKCORE_OPENEXR_DELEGATE)
122 /*
123 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
124 % %
125 % %
126 % %
127 % R e a d E X R I m a g e %
128 % %
129 % %
130 % %
131 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
132 %
133 % ReadEXRImage reads an image in the high dynamic-range (HDR) file format
134 % developed by Industrial Light & Magic. It allocates the memory necessary
135 % for the new Image structure and returns a pointer to the new image.
136 %
137 % The format of the ReadEXRImage method is:
138 %
139 % Image *ReadEXRImage(const ImageInfo *image_info,ExceptionInfo *exception)
140 %
141 % A description of each parameter follows:
142 %
143 % o image_info: the image info.
144 %
145 % o exception: return any errors or warnings in this structure.
146 %
147 */
ReadEXRImage(const ImageInfo * image_info,ExceptionInfo * exception)148 static Image *ReadEXRImage(const ImageInfo *image_info,ExceptionInfo *exception)
149 {
150 const ImfHeader
151 *hdr_info;
152
153 EXRWindowInfo
154 data_window,
155 display_window;
156
157 Image
158 *image;
159
160 ImfInputFile
161 *file;
162
163 ImfRgba
164 *scanline;
165
166 int
167 compression;
168
169 MagickBooleanType
170 status;
171
172 Quantum
173 *q;
174
175 size_t
176 columns;
177
178 ssize_t
179 y;
180
181 /*
182 Open image.
183 */
184 assert(image_info != (const ImageInfo *) NULL);
185 assert(image_info->signature == MagickCoreSignature);
186 if (image_info->debug != MagickFalse)
187 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
188 image_info->filename);
189 assert(exception != (ExceptionInfo *) NULL);
190 assert(exception->signature == MagickCoreSignature);
191 image=AcquireImage(image_info,exception);
192 status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
193 if (status == MagickFalse)
194 {
195 image=DestroyImageList(image);
196 return((Image *) NULL);
197 }
198 file=ImfOpenInputFile(image->filename);
199 if (file == (ImfInputFile *) NULL)
200 {
201 ThrowFileException(exception,BlobError,"UnableToOpenBlob",
202 ImfErrorMessage());
203 image=DestroyImageList(image);
204 return((Image *) NULL);
205 }
206 hdr_info=ImfInputHeader(file);
207 ImfHeaderDataWindow(hdr_info,&display_window.min_x,&display_window.min_y,
208 &display_window.max_x,&display_window.max_y);
209 image->columns=((size_t) display_window.max_x-display_window.min_x+1UL);
210 image->rows=((size_t) display_window.max_y-display_window.min_y+1UL);
211 image->alpha_trait=BlendPixelTrait;
212 (void) SetImageColorspace(image,RGBColorspace,exception);
213 image->gamma=1.0;
214 image->compression=NoCompression;
215 compression=ImfHeaderCompression(hdr_info);
216 if (compression == IMF_RLE_COMPRESSION)
217 image->compression=RLECompression;
218 if (compression == IMF_ZIPS_COMPRESSION)
219 image->compression=ZipSCompression;
220 if (compression == IMF_ZIP_COMPRESSION)
221 image->compression=ZipCompression;
222 if (compression == IMF_PIZ_COMPRESSION)
223 image->compression=PizCompression;
224 if (compression == IMF_PXR24_COMPRESSION)
225 image->compression=Pxr24Compression;
226 #if defined(IMF_B44_COMPRESSION)
227 if (compression == IMF_B44_COMPRESSION)
228 image->compression=B44Compression;
229 #endif
230 #if defined(IMF_B44A_COMPRESSION)
231 if (compression == IMF_B44A_COMPRESSION)
232 image->compression=B44ACompression;
233 #endif
234 #if defined(IMF_DWAA_COMPRESSION)
235 if (compression == IMF_DWAA_COMPRESSION)
236 image->compression=DWAACompression;
237 #endif
238 #if defined(IMF_DWAB_COMPRESSION)
239 if (compression == IMF_DWAB_COMPRESSION)
240 image->compression=DWABCompression;
241 #endif
242 if (image_info->ping != MagickFalse)
243 {
244 (void) ImfCloseInputFile(file);
245 (void) CloseBlob(image);
246 return(GetFirstImageInList(image));
247 }
248 status=SetImageExtent(image,image->columns,image->rows,exception);
249 if (status == MagickFalse)
250 {
251 (void) ImfCloseInputFile(file);
252 return(DestroyImageList(image));
253 }
254 ImfHeaderDataWindow(hdr_info,&data_window.min_x,&data_window.min_y,
255 &data_window.max_x,&data_window.max_y);
256 columns=((size_t) data_window.max_x-data_window.min_x+1UL);
257 if ((display_window.min_x > data_window.max_x) ||
258 (display_window.min_x+(int) image->columns <= data_window.min_x))
259 scanline=(ImfRgba *) NULL;
260 else
261 {
262 scanline=(ImfRgba *) AcquireQuantumMemory(columns,sizeof(*scanline));
263 if (scanline == (ImfRgba *) NULL)
264 {
265 (void) ImfCloseInputFile(file);
266 image=DestroyImageList(image);
267 ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
268 }
269 }
270 for (y=0; y < (ssize_t) image->rows; y++)
271 {
272 int
273 yy;
274
275 ssize_t
276 x;
277
278 q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
279 if (q == (Quantum *) NULL)
280 break;
281 yy=(int) (display_window.min_y+y);
282 if ((yy < data_window.min_y) || (yy > data_window.max_y) ||
283 (scanline == (ImfRgba *) NULL))
284 {
285 for (x=0; x < (ssize_t) image->columns; x++)
286 {
287 SetPixelViaPixelInfo(image,&image->background_color,q);
288 q+=GetPixelChannels(image);
289 }
290 if (SyncAuthenticPixels(image,exception) == MagickFalse)
291 break;
292 continue;
293 }
294 (void) memset(scanline,0,columns*sizeof(*scanline));
295 if (ImfInputSetFrameBuffer(file,scanline-data_window.min_x-columns*yy,1,
296 columns) == 0)
297 {
298 status=MagickFalse;
299 break;
300 }
301 if (ImfInputReadPixels(file,yy,yy) == 0)
302 {
303 status=MagickFalse;
304 break;
305 }
306 for (x=0; x < (ssize_t) image->columns; x++)
307 {
308 int
309 xx;
310
311 xx=(int) (display_window.min_x+x-data_window.min_x);
312 if ((xx < 0) || (display_window.min_x+(int) x > data_window.max_x))
313 SetPixelViaPixelInfo(image,&image->background_color,q);
314 else
315 {
316 SetPixelRed(image,ClampToQuantum((MagickRealType) QuantumRange*
317 ImfHalfToFloat(scanline[xx].r)),q);
318 SetPixelGreen(image,ClampToQuantum((MagickRealType) QuantumRange*
319 ImfHalfToFloat(scanline[xx].g)),q);
320 SetPixelBlue(image,ClampToQuantum((MagickRealType) QuantumRange*
321 ImfHalfToFloat(scanline[xx].b)),q);
322 SetPixelAlpha(image,ClampToQuantum((MagickRealType) QuantumRange*
323 ImfHalfToFloat(scanline[xx].a)),q);
324 }
325 q+=GetPixelChannels(image);
326 }
327 if (SyncAuthenticPixels(image,exception) == MagickFalse)
328 break;
329 }
330 scanline=(ImfRgba *) RelinquishMagickMemory(scanline);
331 (void) ImfCloseInputFile(file);
332 if (status == MagickFalse)
333 ThrowReaderException(CorruptImageError,"UnableToReadImageData");
334 (void) CloseBlob(image);
335 return(GetFirstImageInList(image));
336 }
337 #endif
338
339 /*
340 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
341 % %
342 % %
343 % %
344 % R e g i s t e r E X R I m a g e %
345 % %
346 % %
347 % %
348 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
349 %
350 % RegisterEXRImage() adds properties for the EXR image format
351 % to the list of supported formats. The properties include the image format
352 % tag, a method to read and/or write the format, whether the format
353 % supports the saving of more than one frame to the same file or blob,
354 % whether the format supports native in-memory I/O, and a brief
355 % description of the format.
356 %
357 % The format of the RegisterEXRImage method is:
358 %
359 % size_t RegisterEXRImage(void)
360 %
361 */
RegisterEXRImage(void)362 ModuleExport size_t RegisterEXRImage(void)
363 {
364 char
365 version[MagickPathExtent];
366
367 MagickInfo
368 *entry;
369
370 *version='\0';
371 entry=AcquireMagickInfo("EXR","EXR","High Dynamic-range (HDR)");
372 #if defined(MAGICKCORE_OPENEXR_DELEGATE)
373 entry->decoder=(DecodeImageHandler *) ReadEXRImage;
374 entry->encoder=(EncodeImageHandler *) WriteEXRImage;
375 #if defined( OPENEXR_PACKAGE_STRING)
376 (void) FormatLocaleString(version,MagickPathExtent,OPENEXR_PACKAGE_STRING);
377 #endif
378 #endif
379 entry->magick=(IsImageFormatHandler *) IsEXR;
380 if (*version != '\0')
381 entry->version=ConstantString(version);
382 entry->flags|=CoderDecoderSeekableStreamFlag;
383 entry->flags^=CoderAdjoinFlag;
384 entry->flags^=CoderBlobSupportFlag;
385 (void) RegisterMagickInfo(entry);
386 return(MagickImageCoderSignature);
387 }
388
389 /*
390 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
391 % %
392 % %
393 % %
394 % U n r e g i s t e r E X R I m a g e %
395 % %
396 % %
397 % %
398 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
399 %
400 % UnregisterEXRImage() removes format registrations made by the
401 % EXR module from the list of supported formats.
402 %
403 % The format of the UnregisterEXRImage method is:
404 %
405 % UnregisterEXRImage(void)
406 %
407 */
UnregisterEXRImage(void)408 ModuleExport void UnregisterEXRImage(void)
409 {
410 (void) UnregisterMagickInfo("EXR");
411 }
412
413 #if defined(MAGICKCORE_OPENEXR_DELEGATE)
414 /*
415 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
416 % %
417 % %
418 % %
419 % W r i t e E X R I m a g e %
420 % %
421 % %
422 % %
423 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
424 %
425 % WriteEXRImage() writes an image to a file the in the high dynamic-range
426 % (HDR) file format developed by Industrial Light & Magic.
427 %
428 % The format of the WriteEXRImage method is:
429 %
430 % MagickBooleanType WriteEXRImage(const ImageInfo *image_info,
431 % Image *image,ExceptionInfo *exception)
432 %
433 % A description of each parameter follows.
434 %
435 % o image_info: the image info.
436 %
437 % o image: The image.
438 %
439 % o exception: return any errors or warnings in this structure.
440 %
441 */
WriteEXRImage(const ImageInfo * image_info,Image * image,ExceptionInfo * exception)442 static MagickBooleanType WriteEXRImage(const ImageInfo *image_info,Image *image,
443 ExceptionInfo *exception)
444 {
445 const char
446 *sampling_factor,
447 *value;
448
449 ImageInfo
450 *write_info;
451
452 ImfHalf
453 half_quantum;
454
455 ImfHeader
456 *hdr_info;
457
458 ImfOutputFile
459 *file;
460
461 ImfRgba
462 *scanline;
463
464 int
465 channels,
466 compression,
467 factors[3];
468
469 MagickBooleanType
470 status;
471
472 const Quantum
473 *p;
474
475 ssize_t
476 x;
477
478 ssize_t
479 y;
480
481 /*
482 Open output image file.
483 */
484 assert(image_info != (const ImageInfo *) NULL);
485 assert(image_info->signature == MagickCoreSignature);
486 assert(image != (Image *) NULL);
487 assert(image->signature == MagickCoreSignature);
488 if (image->debug != MagickFalse)
489 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
490 assert(exception != (ExceptionInfo *) NULL);
491 assert(exception->signature == MagickCoreSignature);
492 status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
493 if (status == MagickFalse)
494 return(status);
495 (void) SetImageColorspace(image,RGBColorspace,exception);
496 write_info=CloneImageInfo(image_info);
497 (void) AcquireUniqueFilename(write_info->filename);
498 hdr_info=ImfNewHeader();
499 ImfHeaderSetDataWindow(hdr_info,0,0,(int) image->columns-1,(int)
500 image->rows-1);
501 ImfHeaderSetDisplayWindow(hdr_info,0,0,(int) image->columns-1,(int)
502 image->rows-1);
503 compression=IMF_NO_COMPRESSION;
504 if (write_info->compression == RLECompression)
505 compression=IMF_RLE_COMPRESSION;
506 if (write_info->compression == ZipSCompression)
507 compression=IMF_ZIPS_COMPRESSION;
508 if (write_info->compression == ZipCompression)
509 compression=IMF_ZIP_COMPRESSION;
510 if (write_info->compression == PizCompression)
511 compression=IMF_PIZ_COMPRESSION;
512 if (write_info->compression == Pxr24Compression)
513 compression=IMF_PXR24_COMPRESSION;
514 #if defined(IMF_B44_COMPRESSION)
515 if (write_info->compression == B44Compression)
516 compression=IMF_B44_COMPRESSION;
517 #endif
518 #if defined(IMF_B44A_COMPRESSION)
519 if (write_info->compression == B44ACompression)
520 compression=IMF_B44A_COMPRESSION;
521 #endif
522 #if defined(IMF_DWAA_COMPRESSION)
523 if (write_info->compression == DWAACompression)
524 compression=IMF_DWAA_COMPRESSION;
525 #endif
526 #if defined(IMF_DWAB_COMPRESSION)
527 if (write_info->compression == DWABCompression)
528 compression=IMF_DWAB_COMPRESSION;
529 #endif
530 channels=0;
531 value=GetImageOption(image_info,"exr:color-type");
532 if (value != (const char *) NULL)
533 {
534 if (LocaleCompare(value,"RGB") == 0)
535 channels=IMF_WRITE_RGB;
536 else if (LocaleCompare(value,"RGBA") == 0)
537 channels=IMF_WRITE_RGBA;
538 else if (LocaleCompare(value,"YC") == 0)
539 channels=IMF_WRITE_YC;
540 else if (LocaleCompare(value,"YCA") == 0)
541 channels=IMF_WRITE_YCA;
542 else if (LocaleCompare(value,"Y") == 0)
543 channels=IMF_WRITE_Y;
544 else if (LocaleCompare(value,"YA") == 0)
545 channels=IMF_WRITE_YA;
546 else if (LocaleCompare(value,"R") == 0)
547 channels=IMF_WRITE_R;
548 else if (LocaleCompare(value,"G") == 0)
549 channels=IMF_WRITE_G;
550 else if (LocaleCompare(value,"B") == 0)
551 channels=IMF_WRITE_B;
552 else if (LocaleCompare(value,"A") == 0)
553 channels=IMF_WRITE_A;
554 else
555 (void) ThrowMagickException(exception,GetMagickModule(),CoderWarning,
556 "ignoring invalid defined exr:color-type","=%s",value);
557 }
558 sampling_factor=(const char *) NULL;
559 factors[0]=0;
560 if (image_info->sampling_factor != (char *) NULL)
561 sampling_factor=image_info->sampling_factor;
562 if (sampling_factor != NULL)
563 {
564 /*
565 Sampling factors, valid values are 1x1 or 2x2.
566 */
567 if (sscanf(sampling_factor,"%d:%d:%d",factors,factors+1,factors+2) == 3)
568 {
569 if ((factors[0] == factors[1]) && (factors[1] == factors[2]))
570 factors[0]=1;
571 else
572 if ((factors[0] == (2*factors[1])) && (factors[2] == 0))
573 factors[0]=2;
574 }
575 else
576 if (sscanf(sampling_factor,"%dx%d",factors,factors+1) == 2)
577 {
578 if (factors[0] != factors[1])
579 factors[0]=0;
580 }
581 if ((factors[0] != 1) && (factors[0] != 2))
582 (void) ThrowMagickException(exception,GetMagickModule(),CoderWarning,
583 "ignoring sampling-factor","=%s",sampling_factor);
584 else if (channels != 0)
585 {
586 /*
587 Cross check given color type and subsampling.
588 */
589 factors[1]=((channels == IMF_WRITE_YCA) ||
590 (channels == IMF_WRITE_YC)) ? 2 : 1;
591 if (factors[0] != factors[1])
592 (void) ThrowMagickException(exception,GetMagickModule(),
593 CoderWarning,"sampling-factor and color type mismatch","=%s",
594 sampling_factor);
595 }
596 }
597 if (channels == 0)
598 {
599 /*
600 If no color type given, select it now.
601 */
602 if (factors[0] == 2)
603 channels=image->alpha_trait != UndefinedPixelTrait ? IMF_WRITE_YCA :
604 IMF_WRITE_YC;
605 else
606 channels=image->alpha_trait != UndefinedPixelTrait ? IMF_WRITE_RGBA :
607 IMF_WRITE_RGB;
608 }
609 ImfHeaderSetCompression(hdr_info,compression);
610 ImfHeaderSetLineOrder(hdr_info,IMF_INCREASING_Y);
611 file=ImfOpenOutputFile(write_info->filename,hdr_info,channels);
612 ImfDeleteHeader(hdr_info);
613 if (file == (ImfOutputFile *) NULL)
614 {
615 (void) RelinquishUniqueFileResource(write_info->filename);
616 write_info=DestroyImageInfo(write_info);
617 ThrowFileException(exception,BlobError,"UnableToOpenBlob",
618 ImfErrorMessage());
619 return(MagickFalse);
620 }
621 scanline=(ImfRgba *) AcquireQuantumMemory(image->columns,sizeof(*scanline));
622 if (scanline == (ImfRgba *) NULL)
623 {
624 (void) ImfCloseOutputFile(file);
625 (void) RelinquishUniqueFileResource(write_info->filename);
626 write_info=DestroyImageInfo(write_info);
627 ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
628 }
629 memset(scanline,0,image->columns*sizeof(*scanline));
630 for (y=0; y < (ssize_t) image->rows; y++)
631 {
632 p=GetVirtualPixels(image,0,y,image->columns,1,exception);
633 if (p == (const Quantum *) NULL)
634 break;
635 for (x=0; x < (ssize_t) image->columns; x++)
636 {
637 ImfFloatToHalf(QuantumScale*GetPixelRed(image,p),&half_quantum);
638 scanline[x].r=half_quantum;
639 ImfFloatToHalf(QuantumScale*GetPixelGreen(image,p),&half_quantum);
640 scanline[x].g=half_quantum;
641 ImfFloatToHalf(QuantumScale*GetPixelBlue(image,p),&half_quantum);
642 scanline[x].b=half_quantum;
643 if (image->alpha_trait == UndefinedPixelTrait)
644 ImfFloatToHalf(1.0,&half_quantum);
645 else
646 ImfFloatToHalf(QuantumScale*GetPixelAlpha(image,p),&half_quantum);
647 scanline[x].a=half_quantum;
648 p+=GetPixelChannels(image);
649 }
650 ImfOutputSetFrameBuffer(file,scanline-(y*image->columns),1,image->columns);
651 ImfOutputWritePixels(file,1);
652 }
653 (void) ImfCloseOutputFile(file);
654 scanline=(ImfRgba *) RelinquishMagickMemory(scanline);
655 (void) FileToImage(image,write_info->filename,exception);
656 (void) RelinquishUniqueFileResource(write_info->filename);
657 write_info=DestroyImageInfo(write_info);
658 (void) CloseBlob(image);
659 return(MagickTrue);
660 }
661 #endif
662