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A .NET wrapper for libwebp

License: MIT License

C# 51.19% C 38.92% Batchfile 0.25% F# 8.92% Shell 0.43% PowerShell 0.28%

libwebp-net's Introduction

libwebp wrapper for .NET

Build status for branch 'master': Last nuget release:

This library is available on Nuget as Imazen.WebP.

This library offers P/Invoke exposure for webp/decode.h and webp/encode.h, but not demux.h and mux.h.

Key APIs

new Imazen.WebP.SimpleDecoder().DecodeFromBytes(byte[] data, long length) -> System.Drawing.Bitmap
new Imazen.WebP.SimpleEncoder().Encode(Bitmap from, Stream to, float quality)
Imazen.WebP.SimpleEncoder.GetEncoderVersion() -> String, Imazen.WebP.SimpleDecoder.GetDecoderVersion() -> String

Improvements we're very interested in

Expose the power of Imazen.WebP.Extern.WebPConfig and Imazen.WebP.Extern.WebPPreset for better encoding.
Consider using WebPDecode for better decode error details.
Animation support
Make LoadLibrary cross-platform (although it is not strictly neccessary)
Add .NET Core support. This will likely require introducing a PixelBuffer{width, height, ptr, stride} interface that can wrap System.Drawing.Bitmap via adapter. System.Drawing.Bitmap is currently directly used by the SimpleDecoder and SimpleEncoder classes, but these total < 200 lines of code. Or, leave the core API as P/Invoke only. libwebp doesn't have a bad API at all.

Windows builds of libwebp 0.5.2 can be found here:

https://s3.amazonaws.com/resizer-dynamic-downloads/webp/0.5.2/x86_64/libwebp.dll https://s3.amazonaws.com/resizer-dynamic-downloads/webp/0.5.2/x86/libwebp.dll

You may need vcruntime14 (VS 2015 C++ Redistributable) https://www.microsoft.com/en-us/download/details.aspx?id=48145

This library is binary compatible with as-is NMake builds of libwebp (no custom C/C++).

License

This software is released under the MIT license:

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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marek-stoj artfulhacker gabilan m-abboud lukepulverenti rotemshi kleopatra999 newnon modulexcite prepare zzc000 marklam jss983392998 zuhuizou mattmakes forki leadline terricide hengle veenlee tkweizhong piaoyejie yinchnag eonic hexxone optimax 6hat 1aq maromero3d pavadik zeroexploit gerhobbelt davecs1 git-thinh martin4code icetech233 venkatesh1213 xepherys techspired thinkamacademy-br albertehome lin413095118 enhweb

libwebp-net's Issues

install from nuget cannot get libwebp loaded under .net core 2.2

Have spent some hours to see the 'unable to load libwebp.dll or one of its dependencies' when using libwebp-net from NuGet.

However the project works like a champ when I add the repo as submodule and simply add Imazen.WebP as project reference.

Nuget package info

Hi,
Do not have information about project page (www.github.com/imazen/libwebp-net) on Nuget page (www.nuget.org/packages/Imazen.WebP)

Nothing in version 10.0.1 and 9.0.1

Strong naming the library

Hello,

I need to use the Imazen.WebP library inside a windows service project. Therefor it needs a strong name. Even if I manage to strong name the Imazen.WebP.dll the initialization fails with:

System.IO.FileLoadException: The File or Assembly "Imazen.WebP, Version=9.0.1.0, Culture=neutral, PublicKeyToken=null" or dependency could not be found. A strong named assembly is required. (Exception HRESULT: 0x80131044)

I think this is because the libwebp.dll is not signed / strong named. Is it possible to use the library in such context?

Crashes on indexed images.

It crashes on indexed images. I believe the issue lies here in Encode(Bitmap b, float quality, out IntPtr result, out long length)
using (Bitmap b2 = b.Clone(new Rectangle(0, 0, b.Width, b.Height), System.Drawing.Imaging.PixelFormat.Format32bppArgb))
{
Encode(b2, quality, out result, out length);
}
I've created a workaround that works nicely which is
if (b.PixelFormat.HasFlag(PixelFormat.Indexed))
{
using (var bitmap = new Bitmap(b.Width, b.Height, PixelFormat.Format32bppArgb))
{
using (var graphics = Graphics.FromImage(bitmap))
{
graphics.DrawImageUnscaled(b, 0, 0, b.Width, b.Height);
}
//this is using the stream to. it would have to be revised to reflect your out params
Encode(bitmap, to, quality);
}
}

WebPFree only available on windows builds of libwebp

Hi,

I realize this propably isn't your priority but using this lib on non windows systems utilizing mono fails at the moment. This is due to the fact that WebPFree is a method injected solely through the makefile for the (windows) dll version of the lib.

A good replacement would be WebPSafeFree (utils.h) which provides this function for all systems from 0.4.1 upwards.

Also providing an MSIL version of the package on NuGet (and tagging the repository with the nuget releases) would be a blast :)

Calling convention is wrong

The calling convention is defaulting to stdcall, it needs to be cdecl. This is causing stack corruption.

SimpleEncoder/SimpleDecoder: Non-alpha encoding not correctly round-tripped

I can losslessly encode an image without an alpha channel, but when decoding the data is misaligned.
The encoder specifies the data format, but the decoder always uses BGRA

I think the problem might be due to supplying PixelFormat32... to encoding methods that expect 24bits per pixel, because I noticed that a non-alpha compression is larger than a compression with an alpha channel.

NuGet package

I noticed the NuGet package is from over a year ago. What needs to happen to get it updated?

Works in Dev but Bust in Production

Got this working in development fine... however when I deploy it (An Asp.Net MVC Framework app) I cannot get it to work. Worse yet it does not generate any exceptions but simply outputs an empty 0kb file! I could not install VS 2015 C++ Redistributable as I already have VS 2017 C++ Redistributable. I also put the 32 and 64 bit versions in the corresponding locations i.e. System32 and SysWow64 which worked in dev. Am I missing something else? Any help would be greatly appreciated.

Also note that I am running on Windows Server 2019 thanks.