libpng | Portable Network Graphics support , official libpng | Graphics library

by glennrp C Version: 1.6.37 License: Non-SPDX

X-Ray Key Features Code Snippets(10)Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | libpng Summary

libpng is a C library typically used in User Interface, Graphics applications. libpng has no bugs and it has medium support. However libpng has 15 vulnerabilities and it has a Non-SPDX License. You can download it from GitHub.

see the note about version numbers near the top of png.h. see install for instructions on how to install libpng. libpng comes in several distribution formats. get libpng-.tar.gz or libpng-.tar.xz if you want unix-style line endings in the text files, or lpng*.7z or lpng*.zip if you want dos-style line endings. version 0.89 was the first official release of libpng. don’t let the fact that it’s the first release fool you. the libpng library has been in extensive use and testing since mid-1995. by late 1997 it had finally gotten to the stage where there hadn’t been significant changes to the api in some time, and people have a bad feeling about libraries with versions < 1.0. version 1.0.0 was released in march 1998. additions since 0.90 include the ability to compile libpng as a windows dll, and new apis for accessing data in the info struct. experimental functions include the ability to set weighting and cost factors for row filter selection, direct reads of integers from buffers on big-endian processors that support misaligned data access, faster methods of doing alpha composition, and more accurate 16→8 bit color conversion. the additions since 0.89 include the ability to read from a png stream which has had some (or all) of the signature bytes read by the calling

Support

Quality

Security

License

Reuse

Support

libpng has a medium active ecosystem.

It has 985 star(s) with 517 fork(s). There are 45 watchers for this library.

It had no major release in the last 12 months.

There are 119 open issues and 94 have been closed. On average issues are closed in 430 days. There are 27 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of libpng is 1.6.37

Quality

libpng has no bugs reported.

Security

libpng has 15 vulnerability issues reported (1 critical, 5 high, 9 medium, 0 low).

License

libpng has a Non-SPDX License.

Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

Reuse

libpng releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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libpng Key Features

No Key Features are available at this moment for libpng.

libpng Examples and Code Snippets

(PySide2+anaconda) playing audio via QMediaPlayer: Warning: "Could not open audio device for playback."

Lines of Code : 98

License : Strong Copyleft (CC BY-SA 4.0)

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# check that we're using the global/conda installation
which gst-launch-1.0
# play a test tone
gst-launch-1.0 audiotestsrc ! audioconvert ! audioresample ! pulsesink
# play different audio formats
gst-play-1.0 ~/Desktop/test.wav
gst-play-1

Docker chrome selenium java openjdk:8 to Alpine

Lines of Code : 42

License : Strong Copyleft (CC BY-SA 4.0)

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FROM openjdk:8-jdk-alpine

RUN apk update && apk add --no-cache bash \
    alsa-lib \
    at-spi2-atk \
    atk \
    cairo \
    cups-libs \
    dbus-libs \
    eudev-libs \
    expat \
    flac \
    gdk-pixbuf \
    glib \
    l

OpenCV with Python and Java support using cmake command line

Java

Lines of Code : 159

License : Strong Copyleft (CC BY-SA 4.0)

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$ cmake -DBUILD_SHARED_LIBS=OFF -DOPENCV_EXTRA_MODULES_PATH=/home/plamen/Install/OpenCV_install_info/OpenCV/opencv/build/opencv_contrib/modules \
        -DUSE_AVX_INSTRUCTIONS=ON -DUSE_SSE4_INSTRUCTIONS=ON \
        -DWITH_QT=ON -DWITH_OP

How to improve tesseract ocr results on a clear image?

Lines of Code : 15

License : Strong Copyleft (CC BY-SA 4.0)

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tesseract HfUmN.jpg stdout -l eng --oem 3 --psm 7 -c tessedit_char_whitelist="abcdefghijklmnopqrstuvwxyz0123456789=[], "
Warning: Invalid resolution 0 dpi. Using 70 instead.
6 l1 = [1, 2, 4, 5]

tesseract --version

Tesseract Error: Warning. Invalid resolution 0 dpi. Using 70 instead

Lines of Code : 56

License : Strong Copyleft (CC BY-SA 4.0)

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>tesseract -v
tesseract 4.1.1
 leptonica-1.79.0 (Jan  2 2020, 22:29:02) [MSC v.1924 DLL Release x64]
  libgif 5.1.4 : libjpeg 9c : libpng 1.6.37 : libtiff 4.0.10 : zlib 1.2.11 : libwebp 1.0.3 : libopenjp2 2.3.1

>tesseract --help-ext

Why does ffmpeg need DNS resolver as its dependencies?

Lines of Code : 137

License : Strong Copyleft (CC BY-SA 4.0)

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% brew deps --tree ffmpeg        
ffmpeg
├── aom
├── fontconfig
│   └── freetype
│       └── libpng
├── freetype
│   └── libpng
├── frei0r
├── gnutls
│   ├── gmp
│   ├── libidn2
│   │   ├── gettext
│   │   └── libunistring
│   ├── libtasn1

Building+linking libpng in Android Studio with CMake on Windows

Lines of Code : 13

License : Strong Copyleft (CC BY-SA 4.0)

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add_library(libpng STATIC IMPORTED)
set_target_properties(libpng PROPERTIES IMPORTED_LOCATION
    ${YOUR_LIBS_FOLDER}/libpng-android/obj/local/${ANDROID_ABI}/libpng.a)

add_library(appManager SHARED src/main/cpp/appManager.cpp)

target_inc

Surprisingly low accuracy using tesseract for OCR recognition on simple images. How can I improve it?

Lines of Code : 68

License : Strong Copyleft (CC BY-SA 4.0)

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tesseract --oem 1 -l eng --psm 11 m5WJQ.png stdout

ek ok ek ok ok ok ok ok ok ok ok ok

Filtered image:

65

HAA

Filtered image:

3

HAA

Filtered image:

3.5

HAA

Filtered image:

2.64

HAA

Filtered image:

75

Chromedriver not working with Alpine base docker image

Lines of Code : 29

License : Strong Copyleft (CC BY-SA 4.0)

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RUN apk update && apk add --no-cache bash \
        alsa-lib \
        at-spi2-atk \
        atk \
        cairo \
        cups-libs \
        dbus-libs \
        eudev-libs \
        expat \
        flac \
        gdk-pixbuf \

How do I install libpng on MSYS2?

Lines of Code : 9

License : Strong Copyleft (CC BY-SA 4.0)

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$ pacman -Ss libpng
mingw32/mingw-w64-i686-libpng 1.6.35-1
    A collection of routines used to create PNG format graphics (mingw-w64)
mingw64/mingw-w64-x86_64-libpng 1.6.35-1 [installed]
    A collection of routines used to create PNG for

Community Discussions

Trending Discussions on libpng

How to compile and use libraries with MinGW?

adding the libpng library to cpp in visual studio 2019

GD not support JPEG

Gatsby default starter

Persist Symfony upgrade in Docker container

Getting TypeError: argument of type 'CRS' is not iterable with OSMnx Package

PyQT6: 'QMouseEvent' object has no attribute 'pos'

the command yarn run build throw errors

dask-yarn job fails with dumps_msgpack ImportError while reading parquet

Heroku APT file is not used in the Pipeline

QUESTION

How to compile and use libraries with MinGW?

Asked 2021-Jun-09 at 16:56

I am currently trying to use some libraries (specifically libPNG if it helps) for a project, and would like to know how to compile/use/include it using MinGW.

I have not tried anything yet as I am very clueless about this.

edit: I would appreciate if you explain to me as if I were a child, since I am new to this entire thing

...

ANSWER

Answered 2021-Jun-09 at 16:56

One of the simplest ways of obtaining the binaries for open source libraries compatible with mingw is to switch to use msys2 to provide mingw and pull compiled packages using the package manager pacman that msys2 uses.

The installation of msys2 can be done from here: https://www.msys2.org/

There is quite an extensive list of packages available: https://packages.msys2.org/package/

In this list each package shows the pacman command that can be used to install the package for example: https://packages.msys2.org/package/mingw-w64-x86_64-OpenSceneGraph-debug?repo=mingw64

if you look at the installation line you will see

Source https://stackoverflow.com/questions/67905422

QUESTION

adding the libpng library to cpp in visual studio 2019

Asked 2021-Jun-09 at 09:20

I have never added libraries before and I couldn't find a tutorial which I understood and could follow. I downloaded libpng from here in "download latest version". could anyone explain to me what goes where with specific names and how to find everything? much appreciated.

...

ANSWER

Answered 2021-Jun-09 at 09:20

I suggest you could follow the following steps:

1,Add the path to the header file to the Additional Include Directories(property - >c/c++ -> General -> Additional Include Directories)

2,Add the path to the .lib file to the Additional Library Directories (property -> linker -> General -> Additional Library Directories)

3,Add the name of the .lib file with its extension to Additional Dependencies (property -> linker -> input -> Additional Dependencies)

I suggest you could try to NuGet to install libpng.

1，Right click the project and choose Manage NuGet Packages

2,Browse -> libpng, and then click installer.

3,path to the .lib file:...\packages\libpng.1.6.28.1\build\native\lib\x64\v140\dynamic\Debug

After adding libpng to the VS2019 C++ project through Nuget, because the Nuget package version is suitable for v140, I suggest you can download and install msvc v140 through visual studio installer.

And then right-click on the project Properties-->Configuration Properties-->General--> change Platfrom Toolset to Visual Studio 2015(v140).

And you could also install libpng-v142 nuget package instead and it is for VS2019 VC++.

Source https://stackoverflow.com/questions/67891058

QUESTION

GD not support JPEG

Asked 2021-Jun-02 at 04:19

I tried enabling GD JPEG with DOCKER but it doesn't work. This is my dockerfile :

...

ANSWER

Answered 2021-Jun-02 at 04:19

Try installing the extensions [step 5/5] with a single execution of a docker-php-ext-install, just append to the end:

Source https://stackoverflow.com/questions/67798626

QUESTION

Gatsby default starter

Asked 2021-May-28 at 09:11

This error came when I created gatsby-default-starter site. How to solve it. What is the problem with it?

Error message:

...

ANSWER

Answered 2021-May-28 at 08:20

It seems that you are using Windows as OS. This issue is usually related to some additional dependencies that you may need. Try the following:

Delete your project (to avoid potentially corrupted dependencies).
Install the windows-build-tools by:

Source https://stackoverflow.com/questions/67734980

QUESTION

Persist Symfony upgrade in Docker container

Asked 2021-May-15 at 19:26

I have a PHP-based Docker container with Composer and Symfony installed inside of it. But each time I start that container, a message from Symfony appears, proposing to download & install the last version (and to activate TLS), which I do (for both). So I think the upgrade doesn't persist, how can I solve this ? (thank you in advance)

Thank you for your answers, everyone. The docker-composer.yaml and php/Dockerfile are made from a French tutorial video, slightly modified due to improvements noted in the Youtube comment section: The video is called "Un environnement de développement Symfony 5 avec Docker et Docker-compose" from Yoandev Co. Here is the docker-compose.yaml :

...

ANSWER

Answered 2021-May-15 at 19:26

As you have discovered, container storage is temporary and any changes done in it will be discarded when the container is removed. Note that you can stop a running container and the changes will still be there the next time you launch it, but docker-compose down does remove it, so every time you boot up your symfony binary is being reloaded from the image.

If you want for the updates to persist you'll have to create a volume.

However, since your current installation directory already contains binaries from your base image I'd suggest installing to a different directory and mount that.

In your Dockerfile, change the installation target. Since its a new directory you need to add it to the current $PATH so the tools can be executed.

Source https://stackoverflow.com/questions/67501626

QUESTION

Getting TypeError: argument of type 'CRS' is not iterable with OSMnx Package

Asked 2021-May-13 at 04:04

This question appears to have been answered before, but none of the answers helped in my case. First I should say that I've followed the OSMnx Installation steps exactly. Then tried to run the following code in a Jupyter Notebook:

...

ANSWER

Answered 2021-May-13 at 04:04

You have installed an extremely old version of OSMnx. Your conda list output shows you have version 0.7.3 installed, and that was released 3 or 4 years ago. It's so old that it's incompatible with the modern features of GeoPandas and pyproj, including the modern CRS object that's causing your error. I'm not clear how you did it! My best guess is you installed using one of the old tags on this page, which do point to version 0.7.3.

This should be fixed by removing the old environment and then following the installation instructions here, like:

Source https://stackoverflow.com/questions/67510332

QUESTION

PyQT6: 'QMouseEvent' object has no attribute 'pos'

Asked 2021-May-12 at 04:23

I'm having some problems here with PyQT6 while i try to move a image label trought the screen.

I'm trying to move a label that is in a Scrollabel Area to a frame, and i get the following error: "PyQT6: 'QMouseEvent' object has no attribute 'pos' "

Here is the code:

...

ANSWER

Answered 2021-May-12 at 04:23

Qt6 has refactored the event inputs API to adapt to new technologies (read https://www.qt.io/blog/input-events-in-qt-6 for more information) so it has introduced new base classes such as QSinglePointEvent from which QMouseEvent inherits that have the position() method that returns the position of the event (in this case the mouse). Even so, Qt6 has the pos() method that is redundant but is maintained for compatibility but it seems that PyQt6 has eliminated it which seems like a bug since PySide6 still maintains it having compatibility with Qt6. So in this case you should use position() instead of pos().

Source https://stackoverflow.com/questions/67496362

QUESTION

the command yarn run build throw errors

Asked 2021-May-09 at 20:03

when i try to build my project with yarn run build i get errors that are not exist in my code my code is clean it works fine in my local. I've been stuck for two weeks to resolve this problem please help me to solve this problem. this the errors that i get

node version: v10.15.3

webpack: 4.30.0 this is my package.json

...

ANSWER

Answered 2021-May-09 at 20:03

i added two folders that was missing 'transversal-administration', 'transversal-translation' in the past i have just only: ['app']. the loader in the past load just the app folder

Source https://stackoverflow.com/questions/67426627

QUESTION

dask-yarn job fails with dumps_msgpack ImportError while reading parquet

Asked 2021-Apr-29 at 13:56

I am trying to do a simple read and count of a small parquet file (10K records) using dask-yarn on an AWS EMR cluster with one master and one worker node, both are m5.xlarge instances.

I am trying to execute the following code just to test my cluster:

...

ANSWER

Answered 2021-Apr-29 at 12:43

Your dask and distributed versions have gone out of sync, 2021.4.0 versus 2021.4.1. Updating dask should fix this. Note that you need to ensure that the exact same versions are also in the environment you are using for YARN.

Source https://stackoverflow.com/questions/67309204

QUESTION

Heroku APT file is not used in the Pipeline

Asked 2021-Apr-28 at 11:02

I'm using Apt file in Heroku to have graphicmagic package available in Dyno for years.

Now I wanted to set up Heroku Pipeline tests, but the Heroku does not install apt packages in the build for tests at all. So tests using the graphicmagic are failing.

Is there any way to install the apt packages in the build for Heroku Pipeline tests?

Build logs are here:

Application build log (installing Apt packages at the end)

...

ANSWER

Answered 2021-Apr-28 at 11:02

It is autodetecting. Your Apt buildpack is not recognized:

Source https://stackoverflow.com/questions/67295777

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install libpng

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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