Android-GPUImage-Plus

A C++ & Java library for Image/Camera/Video filters. PRs are welcomed.

New Feature

See the image deform demo.

Gradle dependency

allprojects {
    repositories {
        maven {
            // Use github hosted maven repo for now.
            // Repo url: https://github.com/wysaid/android-gpuimage-plus-maven
            url 'https://maven.wysaid.org/'
        }
    }
}

// Choose only one of them
dependencies {
    // Page size: 4KB (default)
    // Architectures: armeabi-v7a, arm64-v8a, x86, x86_64
    // Full-featured with FFmpeg bundled
    implementation 'org.wysaid:gpuimage-plus:3.1.0'

    // Page size: 16KB
    // Architectures: armeabi-v7a, arm64-v8a, x86, x86_64
    // Full-featured with FFmpeg bundled
    implementation 'org.wysaid:gpuimage-plus:3.1.0-16k'

    // Page size: 4KB (default)
    // Architectures: armeabi-v7a, arm64-v8a, x86, x86_64
    // Image-only version (no video features or FFmpeg)
    implementation 'org.wysaid:gpuimage-plus:3.1.0-min'

    // Page size: 16KB
    // Architectures: armeabi-v7a, arm64-v8a, x86, x86_64
    // Image-only version (no video features or FFmpeg)
    implementation 'org.wysaid:gpuimage-plus:3.1.0-16k-min'
}

To compile other versions of ffmpeg, see: https://github.com/wysaid/FFmpeg-Android.git

Build

Quick start with Android Studio:

1. Add usingCMakeCompile=true to local.properties
2. Open the project in Android Studio
3. Wait for NDK/CMake initialization
4. Build and run

For detailed build instructions, configuration options, and alternative build methods (VS Code, command line, ndk-build), see docs/build.md.

Precompiled libraries: android-gpuimage-plus-libs
iOS version: ios-gpuimage-plus

Manual

1. Usage

Apply a filter with a rule string:

Bitmap srcImage = ...;

// HSL Adjust (hue: 0.02, saturation: -0.31, luminance: -0.17)
String ruleString = "@adjust hsl 0.02 -0.31 -0.17";

Bitmap dstImage = CGENativeLibrary.filterImage_MultipleEffects(srcImage, ruleString, 1.0f);

// Save result
ImageUtil.saveBitmap(dstImage);

2. Custom Shader Filter

2.1 Writing a Filter

Custom filters inherit from CGEImageFilterInterface:

// A simple color reversal filter
class MyCustomFilter : public CGE::CGEImageFilterInterface
{
public:
    bool init()
    {
        CGEConstString fragmentShaderString = CGE_SHADER_STRING_PRECISION_H
        (
        varying vec2 textureCoordinate;
        uniform sampler2D inputImageTexture;

        void main()
        {
            vec4 src = texture2D(inputImageTexture, textureCoordinate);
            src.rgb = 1.0 - src.rgb;  // Reverse all channels
            gl_FragColor = src;
        }
        );

        return m_program.initWithShaderStrings(g_vshDefaultWithoutTexCoord, fragmentShaderString);
    }
};

See customFilter_N.cpp for a complete example.

2.2 Running a Custom Filter

In C++:

// Assumes GL context exists
CGEImageHandlerAndroid handler;
auto* customFilter = new MyCustomFilter();

customFilter->init();
handler.initWithBitmap(env, bitmap);
handler.addImageFilter(customFilter);  // Handler takes ownership

handler.processingFilters();
jobject resultBitmap = handler.getResultBitmap(env);

If no GL context exists, use CGESharedGLContext.

In Java:

Use CGENativeLibrary.cgeFilterImageWithCustomFilter or CGEImageHandler directly.

3. Filter Rule Strings

Filter effects are defined by text-based rule strings. See docs/filter-rules.md for complete syntax reference.

Quick example:

// Chain multiple filters with @ separator
String filter = "@curve RGB (0,0) (128,150) (255,255) " +
                "@adjust hsl 0.02 -0.31 -0.17 " +
                "@blend overlay texture.jpg 80";

4. Key Classes & Threading

Class	Purpose
CGENativeLibrary	Main entry — static filter methods
CGEImageHandler	Image handler wrapper
CGEFrameRenderer	Real-time camera/video renderer
CGEFrameRecorder	Video recording (requires FFmpeg)

Important: GL operations must run on the GL thread:

glSurfaceView.queueEvent(() -> {
    // Your GL operations here
});

Documentation

• docs/build.md — Full build guide and configuration options
• docs/filter-rules.md — Complete filter syntax reference
• .github/CONTRIBUTING.md — Contributing guidelines
• .github/RELEASE.md — Release process

Tool

Some utils are available for creating filters: https://github.com/wysaid/cge-tools

License

MIT License