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dbouron committed Jul 23, 2019
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8 changes: 8 additions & 0 deletions .gitignore
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.idea/
.iml
*.iml
*~
lib/build-linux/
lib/build-w64/
src/main/java/com/criteo/vips/META-INF/
target/
49 changes: 49 additions & 0 deletions CMakeLists.txt
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project(JVIPS C)
cmake_minimum_required(VERSION 3.6.0)

find_package(PkgConfig REQUIRED)

find_package(Java REQUIRED)
include(UseJava)

set(JVIPS_VERSION 1.0.0)

set(CMAKE_C_FLAGS "-std=c99")
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS} -g3")
set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS} -O3 -g")
set(CMAKE_CXX_FLAGS "-std=c++14")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} -g3")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -O3 -g")

# Mingw toolchain fails to find awt and jvm libraries.
# Just check if JNI_INCLUDE_DIRS is defined.
find_package(JNI)
if (DEFINED JNI_INCLUDE_DIRS)
message (STATUS "JNI_INCLUDE_DIRS=${JNI_INCLUDE_DIRS}")
message (STATUS "JNI_LIBRARIES=${JNI_LIBRARIES}")
endif()
include_directories(${JNI_INCLUDE_DIRS})

# BUILD_TARGET should be define in Toolchain file
set(ENV{PKG_CONFIG_PATH} "${CMAKE_SOURCE_DIR}/build/${BUILD_TARGET}/inst/lib/pkgconfig/")

pkg_check_modules(GLIB2 REQUIRED glib-2.0)
if (GLIB2_FOUND)
message (STATUS "GLIB2_INCLUDE_DIRS=${GLIB2_INCLUDE_DIRS}")
message (STATUS "GLIB2_LIBRARIES=${GLIB2_LIBRARIES}")
message (STATUS "GLIB2_LIBRARY_DIRS=${GLIB2_LIBRARY_DIRS}")
endif()
link_directories(${GLIB2_LIBRARY_DIRS})
include_directories(${GLIB2_INCLUDE_DIRS})

pkg_check_modules(VIPS REQUIRED vips)
if (VIPS_FOUND)
message (STATUS "VIPS_INCLUDE_DIRS=${VIPS_INCLUDE_DIRS}")
message (STATUS "VIPS_LIBRARIES=${VIPS_LIBRARIES}")
message (STATUS "VIPS_LIBRARY_DIRS=${VIPS_LIBRARY_DIRS}")
endif()
link_directories(${VIPS_LIBRARY_DIRS})
include_directories(${VIPS_INCLUDE_DIRS})

add_subdirectory(src/main/java/com/criteo/vips/)
add_subdirectory(src/main/c)
201 changes: 201 additions & 0 deletions LICENSE
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125 changes: 125 additions & 0 deletions Readme.md
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#### JVips: libvips Java wrapper

This is a Java wrapper which binds some operations from [libvips](https://github.com/libvips/libvips) using JNI.

This project is deployed and used in production for applying image transformations in the Criteo internal CDN.

Available operations:
- Resize
- Pad
- Crop
- Find trim (get bounding box)
- Get pixel point
- Get image width / height / bands / Nb frame
- Has alpha channel
- Is sRGB colorspace
- Compose image with another one

#### Disclaimer
Not all libvips capabilities are implemented. Feel free to add them.

#### Building from source
JVips build some dependencies from source in order to maximize optimizations.
Linux libraries are embedded in jar file.

Libraries are downloaded from given url in lib/build.sh.
Edit lib/variable.sh for updating libraries version.

Make sure you have cmake3 installed and every dependencies required by libvips on your system:

```
$ sudo dnf install cmake3
```

Moreover, you need some extra dependecencies for cross building Windows 64 bits libJVips.dll:
```
$ sudo dnf install mingw-w64-tools mingw64-gcc mingw64-glib2 mingw64-win-iconv mingw64-expat
```

Run the build with:
```
$ ./build.sh
```
Build options:
- --debug, enable debugging in JVips and its dependencies (default: release mode)
- --without-w64, disable Windows 64 build (default: disable)
- --without-linux, disable Linux build (default: disable)
- --jobs N, define make jobs number (default: 8)

Clean project with:
```bash
$ ./clean.sh
```

#### Installing
##### Linux
Install libvips required dependencies.

##### Windows
Install the official Vips binaries:

1. Download the 64 bit version of libvips ([vips-dev-w64-all-8.7.0.zip](https://github.com/libvips/libvips/releases/download/v8.7.0/vips-dev-w64-all-8.7.0.zip)) and unzip it
2. Set environment variable VIPS_HOME to C:\Program Files\vips-dev-w64-all-8.7.0
3. Append $VIPS_HOME/bin and $VIPS_HOME to $PATH environment variable

##### Testing
Run the HelloWorld main in src/example/java/com/criteo/vips/HelloWorld.java.
It should open the file 'src/example/ressources/in_vips.jpg', resize image and prints:
```
INFO: Trying to load JVips
Image has been correctly resized: (1920,1080) -> (960,540)
```

#### How to bind a vips function
The following steps explain how to bind a function from libvips.
Let's add hasAlpha() method:

1. Declare method in VipsImage interface in src/main/java/com/criteo/vips/VipsImage.java
2. Declare native method in VipsImageImpl in src/main/java/com/criteo/vips/VipsImageImpl.java
```java
public native boolean hasAlpha();
```
3. Run build.sh to generate JNI header file:
```c
/*
* Class: com_criteo_vips_VipsImageImpl
* Method: hasAlpha
* Signature: ()Z
*/
JNIEXPORT jboolean JNICALL Java_com_criteo_vips_VipsImageImpl_hasAlpha
(JNIEnv *, jobject);
```
4. Define and implement function in src/main/c/VipsImage.c
```c
JNIEXPORT jboolean JNICALL
Java_com_criteo_vips_VipsImageImpl_hasAlpha(JNIEnv *env, jobject obj)
{
VipsImage *im = (VipsImage *) (*env)->GetLongField(env, obj, handle_fid);
return vips_image_hasalpha(im);
}
```
#### Benchmark results
On an Ubuntu 18.04 VM running with a quad-core Xeon E3-1271 v3 @ 3.6GHz, we apply the following operations:
- open an 1920x1080 jpg image
- resize to 100x100 dimension
- crop a 50x30 rectangle on the top left corner
- pad to a 50x80 image
- write the output image into a buffer
- release resources
|Implementation|Run time (ms)|Times slower|
|------------- |:------------:| ---------:|
| Vips C 8.7 | 12 | 1.0 |
| JVips 1.0 | 22 | 1.83 |
According to [this results](https://github.com/jcupitt/libvips/wiki/Speed-and-memory-use), JVips is as slower as py-vips.
#### TODO
- Add the missing operations
- Adapt the binding design for calling function by operation name (see also: https://libvips.github.io/libvips/API/current/binding.md.html)
- Publish artifact on the maven central repository
#### Contact
[email protected]
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