Issue 277 in webp: Expose image decoding and encoding to WebPPicture as a library

shubham.bittu@gmail.com via Monorail

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Nov 23, 2015, 3:44:29 AM11/23/15

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Status: New
Owner: ----
Labels: Type-Defect Priority-Medium

New issue 277 by shubham....@gmail.com: Expose image decoding and encoding
to WebPPicture as a library
https://bugs.chromium.org/p/webp/issues/detail?id=277

This is an enhancement request and not a defect.

There is code in the WebP library examples which reads various images into
a WebPPicture in memory object.
See https://github.com/webmproject/libwebp/blob/master/examples/cwebp.c

Similarly, there is code to write WebPPicture to disk in the dwebp.c file.

Is it possible to expose this code as a library, so that it is simple for
others trying to use the apis which rely on WebPPicture in memory object to
reuse the code?

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shubham.bittu@gmail.com via Monorail

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Nov 23, 2015, 3:46:42 AM11/23/15

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Comment #1 on issue 277 by shubham....@gmail.com: Expose image decoding and

encoding to WebPPicture as a library

https://bugs.chromium.org/p/webp/issues/detail?id=277#c1

Sorry, for not opening it as enhancement, can't find a way to edit it now.

pascal.massimino@gmail.com via Monorail

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Dec 1, 2015, 10:04:32 AM12/1/15

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Comment #3 on issue 277 by pascal.m...@gmail.com: Expose image decoding and

encoding to WebPPicture as a library

https://bugs.chromium.org/p/webp/issues/detail?id=277#c3

these utilities are already compiled as a separate
library "examples/libexampleutil.a"
by the 'configure' autotools.

(see examples/Makefile.am entry).

Pascal Massimino

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Jun 2, 2016, 1:31:34 AM6/2/16

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Hi,

an update:

On Tue, Dec 1, 2015 at 7:04 AM, pascal.m...@gmail.com via Monorail <we...@monorail-prod.appspotmail.com> wrote:

Comment #3 on issue 277 by pascal.m...@gmail.com: Expose image decoding and encoding to WebPPicture as a library
https://bugs.chromium.org/p/webp/issues/detail?id=277#c3

these utilities are already compiled as a separate library "examples/libexampleutil.a"
by the 'configure' autotools.

(see examples/Makefile.am entry).

Some recent patches [1][2] might be of interest: it gathers all decoding functions for PNG/JPEG/WebP/TIFF

into a single examples/libexampledec.a library. Rather practical.

skal/

[1] https://chromium-review.googlesource.com/#/c/348750/

[2] https://chromium-review.googlesource.com/#/c/348240/

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pascal.massimino@gmail.com via Monorail

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Jun 2, 2016, 1:33:10 AM6/2/16

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Comment #4 on issue 277 by pascal.m...@gmail.com: Expose image decoding and encoding to WebPPicture as a library
https://bugs.chromium.org/p/webp/issues/detail?id=277#c4

https://chromium-review.googlesource.com/#/c/348750/
https://chromium-review.googlesource.com/#/c/348240/

introduced a common decoding library examples/libexampledec
It's not exposed or installed publicly though, but could come in handy.

Jose del carmen veloz

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Jun 2, 2016, 9:31:30 PM6/2/16

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De: Pascal Massimino
Enviado el: ‎1/‎6/‎16 11:31 p. m.
Para: WebP Discussion
Asunto: Re: Issue 277 in webp: Expose image decoding and encoding toWebPPicture as a library

Visit this group at https://groups.google.com/a/webmproject.org/group/webp-discuss/.

pascal.m… via monorail

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Sep 5, 2016, 11:09:57 AM9/5/16

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Updates:
Status: Started

Comment #5 on issue 277 by pascal.m...@gmail.com: Expose image decoding and encoding to WebPPicture as a library
https://bugs.chromium.org/p/webp/issues/detail?id=277#c5

update: the tip of the tree now has a fully separated source directory for all image utilities: imageio/

The interesting header files there are:
imageio/image_dec.h (generic reader callback for JPEG/PNG/WebP...)
imageio/imageio_util.h (for reading / writing raw data chunks to file)

The corresponding libraries are:
imageio/libimagedec.a
imageio/libimageio_util.a

There's no likely reasons the names will change in the foreseeable future.

The saving part is still a TODO: most of the saving code is still in dwebp.c, and should be extracted to its own library.

bugdro… via monorail

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Sep 8, 2016, 11:01:02 PM9/8/16

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jz… via monorail

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Jan 20, 2017, 3:40:42 PM1/20/17

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Updates:
Status: Fixed

Comment #7 on issue 277 by jz...@google.com: Expose image decoding and encoding to WebPPicture as a library
https://bugs.chromium.org/p/webp/issues/detail?id=277#c7

I don't think we'll include these as a release library, but they can be extracted for reuse now, they don't have many dependencies within the tree.

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