Comments (6)
What API should be used to retrieve it?
In the C API, wuffs_png__decoder__decode_image_config
or wuffs_png__decoder__decode_frame_config
will report metadata, as before. The difference is that you will now have to do so in a loop (instead of calling wuffs_png__decoder__decode_frame_config
just once) if you want trailing metadata. The test/c/std/png.c
change in c5e41f0 has an example.
In the C++ API (which only decodes still images, or the first frame of animated images), wuffs_aux::DecodeImageCallbacks::HandleMetadata
should now be called back for both leading and trailing metadata, not just leading metadata, provided that you've opted into e.g. wuffs_aux::DecodeImageArgFlags::REPORT_METADATA_KVP
for textual metadata (key-value pairs).
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Thank you, I'll try to integrate this. Another beta would be nice to see soon.
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I have just tagged v0.3.0-beta.15
.
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In case it wasn't obvious, you should be able to build and run the new script/print-image-metadata.cc
program, pointing it at your PNG files, and it should pick up (leading and trailing) text chunks (marked as KVPK and KVPV for Key Value Pair {Key,Value}).
$ g++ script/print-image-metadata.cc
$ ./a.out test/data/hibiscus.primitive.png
test/data/hibiscus.primitive.png
PNG
KVPK
53 6F 66 74 77 61 72 65 -- -- -- -- -- -- -- -- Software--------
KVPV
77 77 77 2E 69 6E 6B 73 63 61 70 65 2E 6F 72 67 www.inkscape.org
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Alright, my image viewer has finally stopped using Wuffs together with spng. *Tired "Yay!"*
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my image viewer has finally stopped using Wuffs together with spng.
I assume that you don't mean "(stopped using Wuffs) and (stopped using spng)", but that you mean "stopped using (Wuffs together with spng), and now uses Wuffs only".
:-)
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Related Issues (20)
- Slow f64 parsing HOT 13
- RGB/BGR 16 bit treated like RGBA/BGRA? HOT 1
- OSS-Fuzz issue 59018 HOT 1
- [JPEG] unsupported DQT after SOF markers HOT 1
- OSS-Fuzz issue 59182 HOT 1
- OSS-Fuzz issue 59540 HOT 1
- OSS-Fuzz issue 59966 HOT 1
- A question regarding auxiliary C++ API HOT 4
- What is the status of version 0.3? HOT 3
- Empty slice manipulation triggers UBSAN by offsetting from a null pointer. HOT 2
- error: conversion to ‘uint32_t’ {aka ‘unsigned int’} from ‘int’ may change the sign of the result HOT 3
- OSS-Fuzz issue 66816 HOT 1
- PNG's are stored in RGB order but Wuffs returns BGR/BGRA? HOT 1
- Decode PNG with gray+alpha as 2 channels (i.e. YA not BGRA) HOT 5
- Warning about always true comparison of integers HOT 1
- std/crc64 doesn't build for 32-bit x86 HOT 1
- Allowing LA and RGBA PNGs with a tRNS chunk HOT 2
- How to get the correct 'transparency' value in the DecodeImage API? HOT 2
- wuffs 0.4 significantly slower than 0.3 decoding PNGs HOT 27
- wuffs significantly slower than OpenCV 4.9.0 when decoding PNGs for 7680x4320 image HOT 9
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