1Image::PNG::Const(3) User Contributed Perl Documentation Image::PNG::Const(3)
2
6 Image::PNG::Const - Constants for libpng
7
9 # Get just the constants you need:
10 use Image::PNG::Const qw/PNG_TRANSFORM_INVERT_ALPHA
11 PNG_COLOR_MASK_ALPHA/;
12 # Get everything:
13 use Image::PNG::Const ':all';
14 This module is a helper for Image::PNG::Libpng. It contains no
16 functions, only constants.
17
19 This file contains the following constants, from the header file of the
20 PNG library, "png.h":
21 PNG_AFTER_IDAT
23 PNG_AFTER_IDAT has value 0x08.
24 PNG_ALL_FILTERS
26 PNG_ALL_FILTERS has value ((0x08 | 0x10 | 0x20) | 0x40 | 0x80).
27 PNG_ALL_MNG_FEATURES
29 PNG_ALL_MNG_FEATURES has value 0x05.
30 PNG_ALPHA_ASSOCIATED
32 PNG_ALPHA_ASSOCIATED has value 1.
33 PNG_ALPHA_BROKEN
35 PNG_ALPHA_BROKEN has value 3.
36 PNG_ALPHA_OPTIMIZED
38 PNG_ALPHA_OPTIMIZED has value 2.
39 PNG_ALPHA_PNG
41 PNG_ALPHA_PNG has value 0.
42 PNG_ALPHA_PREMULTIPLIED
44 PNG_ALPHA_PREMULTIPLIED has value 1.
45 PNG_ALPHA_STANDARD
47 PNG_ALPHA_STANDARD has value 1.
48 PNG_ARM_NEON
50 PNG_ARM_NEON has value 0.
51 PNG_BACKGROUND_GAMMA_FILE
53 PNG_BACKGROUND_GAMMA_FILE has value 2.
54 PNG_BACKGROUND_GAMMA_SCREEN
56 PNG_BACKGROUND_GAMMA_SCREEN has value 1.
57 PNG_BACKGROUND_GAMMA_UNIQUE
59 PNG_BACKGROUND_GAMMA_UNIQUE has value 3.
60 PNG_BACKGROUND_GAMMA_UNKNOWN
62 PNG_BACKGROUND_GAMMA_UNKNOWN has value 0.
63 PNG_BLEND_OP_OVER
65 PNG_BLEND_OP_OVER has value 0x01.
66 PNG_BLEND_OP_SOURCE
68 PNG_BLEND_OP_SOURCE has value 0x00.
69 PNG_COLOR_MASK_ALPHA
71 PNG_COLOR_MASK_ALPHA has value 4.
72 PNG_COLOR_MASK_COLOR
74 PNG_COLOR_MASK_COLOR has value 2.
75 PNG_COLOR_MASK_PALETTE
77 PNG_COLOR_MASK_PALETTE has value 1.
78 PNG_COLOR_TYPE_GA
80 PNG_COLOR_TYPE_GA has value (4).
81 PNG_COLOR_TYPE_GRAY
83 PNG_COLOR_TYPE_GRAY has value 0.
84 PNG_COLOR_TYPE_GRAY_ALPHA
86 PNG_COLOR_TYPE_GRAY_ALPHA has value (4).
87 PNG_COLOR_TYPE_PALETTE
89 PNG_COLOR_TYPE_PALETTE has value (2 | 1).
90 PNG_COLOR_TYPE_RGB
92 PNG_COLOR_TYPE_RGB has value (2).
93 PNG_COLOR_TYPE_RGBA
95 PNG_COLOR_TYPE_RGBA has value (2 | 4).
96 PNG_COLOR_TYPE_RGB_ALPHA
98 PNG_COLOR_TYPE_RGB_ALPHA has value (2 | 4).
99 PNG_COMPRESSION_TYPE_BASE
101 PNG_COMPRESSION_TYPE_BASE has value 0.
102 PNG_COMPRESSION_TYPE_DEFAULT
104 PNG_COMPRESSION_TYPE_DEFAULT has value 0.
105 PNG_CRC_DEFAULT
107 PNG_CRC_DEFAULT has value 0.
108 PNG_CRC_ERROR_QUIT
110 PNG_CRC_ERROR_QUIT has value 1.
111 PNG_CRC_NO_CHANGE
113 PNG_CRC_NO_CHANGE has value 5.
114 PNG_CRC_QUIET_USE
116 PNG_CRC_QUIET_USE has value 4.
117 PNG_CRC_WARN_DISCARD
119 PNG_CRC_WARN_DISCARD has value 2.
120 PNG_CRC_WARN_USE
122 PNG_CRC_WARN_USE has value 3.
123 PNG_DEFAULT_sRGB
125 PNG_DEFAULT_sRGB has value -1.
126 PNG_DISPOSE_OP_BACKGROUND
128 PNG_DISPOSE_OP_BACKGROUND has value 0x01.
129 PNG_DISPOSE_OP_NONE
131 PNG_DISPOSE_OP_NONE has value 0x00.
132 PNG_DISPOSE_OP_PREVIOUS
134 PNG_DISPOSE_OP_PREVIOUS has value 0x02.
135 PNG_EQUATION_ARBITRARY
137 PNG_EQUATION_ARBITRARY has value 2.
138 PNG_EQUATION_BASE_E
140 PNG_EQUATION_BASE_E has value 1.
141 PNG_EQUATION_HYPERBOLIC
143 PNG_EQUATION_HYPERBOLIC has value 3.
144 PNG_EQUATION_LINEAR
146 PNG_EQUATION_LINEAR has value 0.
147 PNG_ERROR_ACTION_ERROR
149 PNG_ERROR_ACTION_ERROR has value 3.
150 PNG_ERROR_ACTION_NONE
152 PNG_ERROR_ACTION_NONE has value 1.
153 PNG_ERROR_ACTION_WARN
155 PNG_ERROR_ACTION_WARN has value 2.
156 PNG_FAST_FILTERS
158 PNG_FAST_FILTERS has value (0x08 | 0x10 | 0x20).
159 PNG_FILLER_AFTER
161 PNG_FILLER_AFTER has value 1.
162 PNG_FILLER_BEFORE
164 PNG_FILLER_BEFORE has value 0.
165 PNG_FILTER_AVG
167 PNG_FILTER_AVG has value 0x40.
168 PNG_FILTER_HEURISTIC_DEFAULT
170 PNG_FILTER_HEURISTIC_DEFAULT has value 0.
171 PNG_FILTER_HEURISTIC_UNWEIGHTED
173 PNG_FILTER_HEURISTIC_UNWEIGHTED has value 1.
174 PNG_FILTER_HEURISTIC_WEIGHTED
176 PNG_FILTER_HEURISTIC_WEIGHTED has value 2.
177 PNG_FILTER_NONE
179 PNG_FILTER_NONE has value 0x08.
180 PNG_FILTER_PAETH
182 PNG_FILTER_PAETH has value 0x80.
183 PNG_FILTER_SUB
185 PNG_FILTER_SUB has value 0x10.
186 PNG_FILTER_TYPE_BASE
188 PNG_FILTER_TYPE_BASE has value 0.
189 PNG_FILTER_TYPE_DEFAULT
191 PNG_FILTER_TYPE_DEFAULT has value 0.
192 PNG_FILTER_UP
194 PNG_FILTER_UP has value 0x20.
195 PNG_FILTER_VALUE_AVG
197 PNG_FILTER_VALUE_AVG has value 3.
198 PNG_FILTER_VALUE_NONE
200 PNG_FILTER_VALUE_NONE has value 0.
201 PNG_FILTER_VALUE_PAETH
203 PNG_FILTER_VALUE_PAETH has value 4.
204 PNG_FILTER_VALUE_SUB
206 PNG_FILTER_VALUE_SUB has value 1.
207 PNG_FILTER_VALUE_UP
209 PNG_FILTER_VALUE_UP has value 2.
210 PNG_FLAG_MNG_EMPTY_PLTE
212 PNG_FLAG_MNG_EMPTY_PLTE has value 0x01.
213 PNG_FLAG_MNG_FILTER_64
215 PNG_FLAG_MNG_FILTER_64 has value 0x04.
216 PNG_FORMAT_ABGR
218 PNG_FORMAT_ABGR has value (((0x02|0x10)|0x01)|0x20).
219 PNG_FORMAT_ABGR_COLORMAP
221 PNG_FORMAT_ABGR_COLORMAP has value
222 ((((0x02|0x10)|0x01)|0x20)|0x08).
223 PNG_FORMAT_AG
225 PNG_FORMAT_AG has value (0x01|0x20).
226 PNG_FORMAT_ARGB
228 PNG_FORMAT_ARGB has value ((0x02|0x01)|0x20).
229 PNG_FORMAT_ARGB_COLORMAP
231 PNG_FORMAT_ARGB_COLORMAP has value (((0x02|0x01)|0x20)|0x08).
232 PNG_FORMAT_BGR
234 PNG_FORMAT_BGR has value (0x02|0x10).
235 PNG_FORMAT_BGRA
237 PNG_FORMAT_BGRA has value ((0x02|0x10)|0x01).
238 PNG_FORMAT_BGRA_COLORMAP
240 PNG_FORMAT_BGRA_COLORMAP has value (((0x02|0x10)|0x01)|0x08).
241 PNG_FORMAT_BGR_COLORMAP
243 PNG_FORMAT_BGR_COLORMAP has value ((0x02|0x10)|0x08).
244 PNG_FORMAT_FLAG_AFIRST
246 PNG_FORMAT_FLAG_AFIRST has value 0x20.
247 PNG_FORMAT_FLAG_ALPHA
249 PNG_FORMAT_FLAG_ALPHA has value 0x01.
250 PNG_FORMAT_FLAG_ASSOCIATED_ALPHA
252 PNG_FORMAT_FLAG_ASSOCIATED_ALPHA has value 0x40.
253 PNG_FORMAT_FLAG_BGR
255 PNG_FORMAT_FLAG_BGR has value 0x10.
256 PNG_FORMAT_FLAG_COLOR
258 PNG_FORMAT_FLAG_COLOR has value 0x02.
259 PNG_FORMAT_FLAG_COLORMAP
261 PNG_FORMAT_FLAG_COLORMAP has value 0x08.
262 PNG_FORMAT_FLAG_LINEAR
264 PNG_FORMAT_FLAG_LINEAR has value 0x04.
265 PNG_FORMAT_GA
267 PNG_FORMAT_GA has value 0x01.
268 PNG_FORMAT_GRAY
270 PNG_FORMAT_GRAY has value 0.
271 PNG_FORMAT_LINEAR_RGB
273 PNG_FORMAT_LINEAR_RGB has value (0x04|0x02).
274 PNG_FORMAT_LINEAR_Y
276 PNG_FORMAT_LINEAR_Y has value 0x04.
277 PNG_FORMAT_LINEAR_Y_ALPHA
279 PNG_FORMAT_LINEAR_Y_ALPHA has value (0x04|0x01).
280 PNG_FORMAT_RGB
282 PNG_FORMAT_RGB has value 0x02.
283 PNG_FORMAT_RGBA
285 PNG_FORMAT_RGBA has value (0x02|0x01).
286 PNG_FORMAT_RGBA_COLORMAP
288 PNG_FORMAT_RGBA_COLORMAP has value ((0x02|0x01)|0x08).
289 PNG_FORMAT_RGB_COLORMAP
291 PNG_FORMAT_RGB_COLORMAP has value (0x02|0x08).
292 PNG_FP_1
294 PNG_FP_1 has value 100000.
295 PNG_FP_HALF
297 PNG_FP_HALF has value 50000.
298 PNG_FP_MIN
300 PNG_FP_MIN has value (-PNG_FP_MAX).
301 PNG_FREE_ALL
303 PNG_FREE_ALL has value 0xffff.
304 PNG_FREE_EXIF
306 PNG_FREE_EXIF has value 0x8000.
307 PNG_FREE_HIST
309 PNG_FREE_HIST has value 0x0008.
310 PNG_FREE_ICCP
312 PNG_FREE_ICCP has value 0x0010.
313 PNG_FREE_MUL
315 PNG_FREE_MUL has value 0x4220.
316 PNG_FREE_PCAL
318 PNG_FREE_PCAL has value 0x0080.
319 PNG_FREE_PLTE
321 PNG_FREE_PLTE has value 0x1000.
322 PNG_FREE_ROWS
324 PNG_FREE_ROWS has value 0x0040.
325 PNG_FREE_SCAL
327 PNG_FREE_SCAL has value 0x0100.
328 PNG_FREE_SPLT
330 PNG_FREE_SPLT has value 0x0020.
331 PNG_FREE_TEXT
333 PNG_FREE_TEXT has value 0x4000.
334 PNG_FREE_TRNS
336 PNG_FREE_TRNS has value 0x2000.
337 PNG_FREE_UNKN
339 PNG_FREE_UNKN has value 0x0200.
340 PNG_GAMMA_LINEAR
342 PNG_GAMMA_LINEAR has value 100000.
343 PNG_GAMMA_MAC_18
345 PNG_GAMMA_MAC_18 has value -2.
346 PNG_GAMMA_THRESHOLD
348 PNG_GAMMA_THRESHOLD has value (PNG_GAMMA_THRESHOLD_FIXED*.00001).
349 PNG_GAMMA_sRGB
351 PNG_GAMMA_sRGB has value 220000.
352 PNG_HANDLE_CHUNK_ALWAYS
354 PNG_HANDLE_CHUNK_ALWAYS has value 3.
355 PNG_HANDLE_CHUNK_AS_DEFAULT
357 PNG_HANDLE_CHUNK_AS_DEFAULT has value 0.
358 PNG_HANDLE_CHUNK_IF_SAFE
360 PNG_HANDLE_CHUNK_IF_SAFE has value 2.
361 PNG_HANDLE_CHUNK_NEVER
363 PNG_HANDLE_CHUNK_NEVER has value 1.
364 PNG_HAVE_IHDR
366 PNG_HAVE_IHDR has value 0x01.
367 PNG_HAVE_PLTE
369 PNG_HAVE_PLTE has value 0x02.
370 PNG_IGNORE_ADLER32
372 PNG_IGNORE_ADLER32 has value 8.
373 PNG_IMAGE_ERROR
375 PNG_IMAGE_ERROR has value 2.
376 PNG_IMAGE_FLAG_16BIT_sRGB
378 PNG_IMAGE_FLAG_16BIT_sRGB has value 0x04.
379 PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB
381 PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB has value 0x01.
382 PNG_IMAGE_FLAG_FAST
384 PNG_IMAGE_FLAG_FAST has value 0x02.
385 PNG_IMAGE_VERSION
387 PNG_IMAGE_VERSION has value 1.
388 PNG_IMAGE_WARNING
390 PNG_IMAGE_WARNING has value 1.
391 PNG_INFO_IDAT
393 PNG_INFO_IDAT has value 0x8000.
394 PNG_INFO_PLTE
396 PNG_INFO_PLTE has value 0x0008.
397 PNG_INFO_acTL
399 PNG_INFO_acTL has value 0x20000.
400 PNG_INFO_bKGD
402 PNG_INFO_bKGD has value 0x0020.
403 PNG_INFO_cHRM
405 PNG_INFO_cHRM has value 0x0004.
406 PNG_INFO_eXIf
408 PNG_INFO_eXIf has value 0x10000.
409 PNG_INFO_fcTL
411 PNG_INFO_fcTL has value 0x40000.
412 PNG_INFO_gAMA
414 PNG_INFO_gAMA has value 0x0001.
415 PNG_INFO_hIST
417 PNG_INFO_hIST has value 0x0040.
418 PNG_INFO_iCCP
420 PNG_INFO_iCCP has value 0x1000.
421 PNG_INFO_oFFs
423 PNG_INFO_oFFs has value 0x0100.
424 PNG_INFO_pCAL
426 PNG_INFO_pCAL has value 0x0400.
427 PNG_INFO_pHYs
429 PNG_INFO_pHYs has value 0x0080.
430 PNG_INFO_sBIT
432 PNG_INFO_sBIT has value 0x0002.
433 PNG_INFO_sCAL
435 PNG_INFO_sCAL has value 0x4000.
436 PNG_INFO_sPLT
438 PNG_INFO_sPLT has value 0x2000.
439 PNG_INFO_sRGB
441 PNG_INFO_sRGB has value 0x0800.
442 PNG_INFO_tIME
444 PNG_INFO_tIME has value 0x0200.
445 PNG_INFO_tRNS
447 PNG_INFO_tRNS has value 0x0010.
448 PNG_INTERLACE_ADAM7
450 PNG_INTERLACE_ADAM7 has value 1.
451 PNG_INTERLACE_ADAM7_PASSES
453 PNG_INTERLACE_ADAM7_PASSES has value 7.
454 PNG_INTERLACE_NONE
456 PNG_INTERLACE_NONE has value 0.
457 PNG_INTRAPIXEL_DIFFERENCING
459 PNG_INTRAPIXEL_DIFFERENCING has value 64.
460 PNG_IO_CHUNK_CRC
462 PNG_IO_CHUNK_CRC has value 0x0080.
463 PNG_IO_CHUNK_DATA
465 PNG_IO_CHUNK_DATA has value 0x0040.
466 PNG_IO_CHUNK_HDR
468 PNG_IO_CHUNK_HDR has value 0x0020.
469 PNG_IO_MASK_LOC
471 PNG_IO_MASK_LOC has value 0x00f0.
472 PNG_IO_MASK_OP
474 PNG_IO_MASK_OP has value 0x000f.
475 PNG_IO_NONE
477 PNG_IO_NONE has value 0x0000.
478 PNG_IO_READING
480 PNG_IO_READING has value 0x0001.
481 PNG_IO_SIGNATURE
483 PNG_IO_SIGNATURE has value 0x0010.
484 PNG_IO_WRITING
486 PNG_IO_WRITING has value 0x0002.
487 PNG_ITXT_COMPRESSION_NONE
489 PNG_ITXT_COMPRESSION_NONE has value 1.
490 PNG_ITXT_COMPRESSION_zTXt
492 PNG_ITXT_COMPRESSION_zTXt has value 2.
493 PNG_KEYWORD_MAX_LENGTH
495 PNG_KEYWORD_MAX_LENGTH has value 79.
496 PNG_MAXIMUM_INFLATE_WINDOW
498 PNG_MAXIMUM_INFLATE_WINDOW has value 2.
499 PNG_MAX_PALETTE_LENGTH
501 PNG_MAX_PALETTE_LENGTH has value 256.
502 PNG_MIPS_MSA
504 PNG_MIPS_MSA has value 6.
505 PNG_NO_FILTERS
507 PNG_NO_FILTERS has value 0x00.
508 PNG_OFFSET_MICROMETER
510 PNG_OFFSET_MICROMETER has value 1.
511 PNG_OFFSET_PIXEL
513 PNG_OFFSET_PIXEL has value 0.
514 PNG_OPTION_INVALID
516 PNG_OPTION_INVALID has value 1.
517 PNG_OPTION_NEXT
519 PNG_OPTION_NEXT has value 12.
520 PNG_OPTION_OFF
522 PNG_OPTION_OFF has value 2.
523 PNG_OPTION_ON
525 PNG_OPTION_ON has value 3.
526 PNG_OPTION_UNSET
528 PNG_OPTION_UNSET has value 0.
529 PNG_POWERPC_VSX
531 PNG_POWERPC_VSX has value 10.
532 PNG_RESOLUTION_METER
534 PNG_RESOLUTION_METER has value 1.
535 PNG_RESOLUTION_UNKNOWN
537 PNG_RESOLUTION_UNKNOWN has value 0.
538 PNG_RGB_TO_GRAY_DEFAULT
540 PNG_RGB_TO_GRAY_DEFAULT has value (-1).
541 PNG_SCALE_METER
543 PNG_SCALE_METER has value 1.
544 PNG_SCALE_RADIAN
546 PNG_SCALE_RADIAN has value 2.
547 PNG_SCALE_UNKNOWN
549 PNG_SCALE_UNKNOWN has value 0.
550 PNG_SKIP_sRGB_CHECK_PROFILE
552 PNG_SKIP_sRGB_CHECK_PROFILE has value 4.
553 PNG_TEXT_COMPRESSION_NONE
555 PNG_TEXT_COMPRESSION_NONE has value -1.
556 PNG_TEXT_COMPRESSION_NONE_WR
558 PNG_TEXT_COMPRESSION_NONE_WR has value -3.
559 PNG_TEXT_COMPRESSION_zTXt
561 PNG_TEXT_COMPRESSION_zTXt has value 0.
562 PNG_TEXT_COMPRESSION_zTXt_WR
564 PNG_TEXT_COMPRESSION_zTXt_WR has value -2.
565 PNG_TRANSFORM_BGR
567 PNG_TRANSFORM_BGR has value 0x0080.
568 PNG_TRANSFORM_EXPAND
570 PNG_TRANSFORM_EXPAND has value 0x0010.
571 PNG_TRANSFORM_EXPAND_16
573 PNG_TRANSFORM_EXPAND_16 has value 0x4000.
574 PNG_TRANSFORM_GRAY_TO_RGB
576 PNG_TRANSFORM_GRAY_TO_RGB has value 0x2000.
577 PNG_TRANSFORM_IDENTITY
579 PNG_TRANSFORM_IDENTITY has value 0x0000.
580 PNG_TRANSFORM_INVERT_ALPHA
582 PNG_TRANSFORM_INVERT_ALPHA has value 0x0400.
583 PNG_TRANSFORM_INVERT_MONO
585 PNG_TRANSFORM_INVERT_MONO has value 0x0020.
586 PNG_TRANSFORM_PACKING
588 PNG_TRANSFORM_PACKING has value 0x0004.
589 PNG_TRANSFORM_PACKSWAP
591 PNG_TRANSFORM_PACKSWAP has value 0x0008.
592 PNG_TRANSFORM_SCALE_16
594 PNG_TRANSFORM_SCALE_16 has value 0x8000.
595 PNG_TRANSFORM_SHIFT
597 PNG_TRANSFORM_SHIFT has value 0x0040.
598 PNG_TRANSFORM_STRIP_16
600 PNG_TRANSFORM_STRIP_16 has value 0x0001.
601 PNG_TRANSFORM_STRIP_ALPHA
603 PNG_TRANSFORM_STRIP_ALPHA has value 0x0002.
604 PNG_TRANSFORM_STRIP_FILLER
606 PNG_TRANSFORM_STRIP_FILLER has value 0x0800.
607 PNG_TRANSFORM_STRIP_FILLER_AFTER
609 PNG_TRANSFORM_STRIP_FILLER_AFTER has value 0x1000.
610 PNG_TRANSFORM_STRIP_FILLER_BEFORE
612 PNG_TRANSFORM_STRIP_FILLER_BEFORE has value 0x0800.
613 PNG_TRANSFORM_SWAP_ALPHA
615 PNG_TRANSFORM_SWAP_ALPHA has value 0x0100.
616 PNG_TRANSFORM_SWAP_ENDIAN
618 PNG_TRANSFORM_SWAP_ENDIAN has value 0x0200.
619 PNG_sRGB_INTENT_ABSOLUTE
621 PNG_sRGB_INTENT_ABSOLUTE has value 3.
622 PNG_sRGB_INTENT_PERCEPTUAL
624 PNG_sRGB_INTENT_PERCEPTUAL has value 0.
625 PNG_sRGB_INTENT_RELATIVE
627 PNG_sRGB_INTENT_RELATIVE has value 1.
628 PNG_sRGB_INTENT_SATURATION
630 PNG_sRGB_INTENT_SATURATION has value 2.
631
633 Nothing is exported by default, but all the symbols in this module can
634 be exported on request. There is one export tag, 'all', which exports
635 all the symbols in this module:
636 use Image::PNG::Const ':all';
638
640 This Perl module was generated from the file png.h supplied with
641 version 1.6.37 of libpng.
642
644 Ben Bullock, <bkb@cpan.org>
645
647 This package and associated files are copyright (C) 2011-2020 Ben
648 Bullock.
649 You can use, copy, modify and redistribute this package and associated
651 files under the Perl Artistic Licence or the GNU General Public
652 Licence.
653perl v5.32.1 2021-01-27 Image::PNG::Const(3)