zakgof / webp4j

Simple Java webp image format encoder and decoder

webp4j

Simple Java webp image format encoder and decoder

WebP images are claimed to be 25-34% smaller than comparable JPEG images at equivalent SSIM quality index. https://developers.google.com/speed/webp/

webp4j uses JNI to link to native libwebp libraries (included into distribution jar).

Supported platforms:

• Linux 32/64 bit
• Windows 32/64 bit

Webp4j is on Bintray

Gradle

repositories {
    jcenter()
}

dependencies {
    compile 'com.github.zakgof:webp4j:0.0.2'
}

Usage

// Encode
BufferedImage bi = ...
float quality = 80f;
byte[] bytes = Webp4j.encode(bi, quality);

// Decode
BufferedImage restored = Webp4j.decode(bytes);

webp4j's Issues

Support alpha channel

ARGB format

java.lang.ArrayIndexOutOfBoundsException: Index 3 out of bounds for length 3

HI,

Im not able to convert any PNG to WEBP but JPEG works fine for me. Code is simple:

BufferedImage image = ImageIO.read(inputStream);
return Webp4j.encode(image, WEBP_QUALITY);

as mention before, if i put a JPEG in the inputstream, it converts fine, but when I try with PNG, it throws an error:
Caused by: java.lang.ArrayIndexOutOfBoundsException: Index 3 out of bounds for length 3
at java.desktop/java.awt.image.ComponentSampleModel.getPixel(ComponentSampleModel.java:744) ~[na:na]
at java.desktop/java.awt.image.Raster.getPixel(Raster.java:1605) ~[na:na]
at com.zakgof.webp4j.BITools.scan(BITools.java:24) ~[webp4j-0.0.2.jar!/:na]
at com.zakgof.webp4j.Webp4j.encode(Webp4j.java:23) ~[webp4j-0.0.2.jar!/:na]

Support lossless compression

Manipukating the size (height width) of animated webp file