This repository contains the original code from the source repo plus...
- my wrapper code to handle animated WebP files,
e.g.
var frames = webp.AnimLoad(strFilepath); // or var frames = webp.AnimDecode(byteArray);
improvements by russaa (russaa/WebP-wrapper-animatedWebP):
- Refactor: avoid duplicate library files
- support optional frame ranges (by indices) when decoding animated webp files (see
WebP.AnimDecode(..)), e.g.would only decode the 1st framevar frames = webp.AnimDecode(byteArray, 0, 1);
- use
libwebpversion 1.3.0
and my newest extension:
- functionality for getting animated WebP's (compressed) frame data,
e.g.
for decoding at a later time, e.g.
_ = webp.AnimInit(strFilepath, out uint frameCount); var frameData = webp.AnimGetFrame(intFrameNumber);
var bmp = webp.Decode(frameData.Data);
These changes are intended to be integrated back into the upstream repo, waiting for the decision whether and how they should be integrated.
[original]
Wrapper for libwebp in C#. The most complete wrapper in pure managed C#.
Exposes Simple Decoding and Encoding API, Advanced Decoding and Encoding API (with statistics of compression), Get version library and WebPGetFeatures (info of any WebP file). Exposed get PSNR, SSIM or LSIM distortion metrics.
The wrapper is in safe managed code in one class. No need for external dll except libwebp_x86.dll(included v0.4.4) and libwebp_x64.dll (included v1.2.1). The wrapper works in 32, 64 bit or ANY (auto swith to the appropriate library).
The code is commented and includes simple examples for using the wrapper.
Load WebP image for WebP file
using (WebP webp = new WebP())
Bitmap bmp = webp.Load("test.webp");Decode WebP filename to bitmap and load in PictureBox container
byte[] rawWebP = File.ReadAllBytes("test.webp");
using (WebP webp = new WebP())
this.pictureBox.Image = webp.Decode(rawWebP);Advanced decode WebP filename to bitmap and load in PictureBox container
byte[] rawWebP = File.ReadAllBytes("test.webp");
WebPDecoderOptions decoderOptions = new WebPDecoderOptions();
decoderOptions.use_threads = 1; //Use multhreading
decoderOptions.flip = 1; //Flip the image
using (WebP webp = new WebP())
this.pictureBox.Image = webp.Decode(rawWebP, decoderOptions);Get thumbnail with 200x150 pixels in fast/low quality mode
using (WebP webp = new WebP())
this.pictureBox.Image = webp.GetThumbnailFast(rawWebP, 200, 150);Get thumbnail with 200x150 pixels in slow/high quality mode
using (WebP webp = new WebP())
this.pictureBox.Image = webp.GetThumbnailQuality(rawWebP, 200, 150);Save bitmap to WebP file
Bitmap bmp = new Bitmap("test.jpg");
using (WebP webp = new WebP())
webp.Save(bmp, 80, "test.webp");Encode to memory buffer in lossy mode with quality 75 and save to file
byte[] rawWebP = File.ReadAllBytes("test.jpg");
using (WebP webp = new WebP())
rawWebP = webp.EncodeLossy(bmp, 75);
File.WriteAllBytes("test.webp", rawWebP); Encode to memory buffer in lossy mode with quality 75 and speed 9. Save to file
byte[] rawWebP = File.ReadAllBytes("test.jpg");
using (WebP webp = new WebP())
rawWebP = webp.EncodeLossy(bmp, 75, 9);
File.WriteAllBytes("test.webp", rawWebP); Encode to memory buffer in lossy mode with quality 75, speed 9 and get information. Save to file
byte[] rawWebP = File.ReadAllBytes("test.jpg");
using (WebP webp = new WebP())
rawWebP = webp.EncodeLossy(bmp, 75, 9, true);
File.WriteAllBytes("test.webp", rawWebP); Encode to memory buffer in lossless mode and save to file
byte[] rawWebP = File.ReadAllBytes("test.jpg");
using (WebP webp = new WebP())
rawWebP = webp.EncodeLossless(bmp);
File.WriteAllBytes("test.webp", rawWebP); Encode to memory buffer in lossless mode with speed 9 and save to file
byte[] rawWebP = File.ReadAllBytes("test.jpg");
using (WebP webp = new WebP())
rawWebP = webp.EncodeLossless(bmp, 9);
File.WriteAllBytes("test.webp", rawWebP); Encode to memory buffer in near lossless mode with quality 40 and speed 9 and save to file
byte[] rawWebP = File.ReadAllBytes("test.jpg");
using (WebP webp = new WebP())
rawWebP = webp.EncodeNearLossless(bmp, 40, 9);
File.WriteAllBytes("test.webp", rawWebP); Get version of libwebp.dll
using (WebP webp = new WebP())
string version = "libwebp.dll v" + webp.GetVersion();Get info from WebP file
byte[] rawWebp = File.ReadAllBytes(pathFileName);
using (WebP webp = new WebP())
webp.GetInfo(rawWebp, out width, out height, out has_alpha, out has_animation, out format);
MessageBox.Show("Width: " + width + "\n" +
"Height: " + height + "\n" +
"Has alpha: " + has_alpha + "\n" +
"Is animation: " + has_animation + "\n" +
"Format: " + format);Get PSNR, SSIM or LSIM distortion metric between two pictures
int metric = 0; //0 = PSNR, 1= SSIM, 2=LSIM
Bitmap bmp1 = Bitmap.FromFile("image1.png");
Bitmap bmp2 = Bitmap.FromFile("image2.png");
using (WebP webp = new WebP())
result = webp.GetPictureDistortion(source, reference, metric);
MessageBox.Show("Red: " + result[0] + "dB.\nGreen: " + result[1] + "dB.\nBlue: " + result[2] + "dB.\nAlpha: " + result[3] + "dB.\nAll: " + result[4] + "dB.", "PSNR");
MessageBox.Show("Red: " + result[0] + dB\n" +
"Green: " + result[1] + "dB\n" +
"Blue: " + result[2] + "dB\n" +
"Alpha: " + result[3] + "dB\n" +
"All: " + result[4] + "dB\n");Thanks to jzern@google.com
Without their help this wapper would not have been possible.