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add swig interface

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Currently only supports a subset of decode functions and likely only
works fully for java.

For java bindings:
The generated java source can be compiled and the class files added to
libwebp.jar.
The generated jni source can be compiled to, e.g., libwebp_jni.so, which
can then be loaded via System.loadLibrary("webp_jni").

Change-Id: I8225933cbaf85c9cfa4b78c2e5f167cee8b62408
This commit is contained in:
James Zern 2011-05-06 13:09:56 -07:00
parent e9273902f1
commit f6fb3877ed
2 changed files with 135 additions and 0 deletions
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20
README
View File

@ -76,6 +76,26 @@ Note: The encoding and decoding libraries are compiled separately
can be installed independently using a minor modifications in the
corresponding Makefile.am configure files (see comments there).
SWIG bindings:
--------------
To generate language bindings from swig/libwebp.i swig-1.3
(http://www.swig.org) is required. 2.0 may work, but has not been tested.
Currently from the decode interface the following functions are mapped:
WebPGetDecoderVersion
WebPGetInfo
WebPDecodeRGB
WebPDecodeRGBA
WebPDecodeBGR
WebPDecodeBGRA
Java bindings:
To build the swig-generated JNI wrapper code at least JDK-1.5 (or equivalent)
is necessary for enum support. The output is intended to be a shared object /
DLL that can be loaded via System.loadLibrary("webp_jni").
Encoding tool:
==============

115
swig/libwebp.i Normal file
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@ -0,0 +1,115 @@
// Copyright 2011 Google Inc.
//
// This code is licensed under the same terms as WebM:
// Software License Agreement: http://www.webmproject.org/license/software/
// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
// -----------------------------------------------------------------------------
//
// libwebp swig interface definition
//
// Author: James Zern (jzern@google.com)
//
// For java bindings compile with:
// $ mkdir -p java/com/google/webp
// $ swig -ignoremissing -I../src \
// -java \
// -package com.google.webp \
// -outdir java/com/google/webp \
// -o libwebp_java_wrap.c libwebp.i
%module libwebp
%include "constraints.i"
%include "typemaps.i"
%ignore WEBP_WEBP_DECODE_H_;
// FIXME for these to be available returned_buffer_size() would need to be
// made more intelligent.
%ignore WebPDecodeRGBInto;
%ignore WebPDecodeYUV;
%ignore WebPDecodeRGBAInto;
%ignore WebPDecodeBGRInto;
%ignore WebPDecodeBGRAInto;
%ignore WebPDecodeYUVInto;
// incremental decoding
%ignore WebPIDecGetYUV;
%ignore WebPINew;
%ignore WebPIDecoder;
%ignore WebPIAppend;
%ignore WebPIDecGetRGB;
%ignore WebPIDelete;
%ignore WebPINewRGB;
%ignore WebPINewYUV;
%ignore WebPIUpdate;
%ignore WebPInitCustomIo;
%ignore WebPInitDecParams;
%apply int *OUTPUT { int *width, int *height }
%apply int { uint32_t data_size }
%apply Number NONNEGATIVE { uint32_t data_size }
// free the buffer returned by these functions after copying into
// the native type
%newobject WebPDecodeRGB;
%newobject WebPDecodeRGBA;
%newobject WebPDecodeBGR;
%newobject WebPDecodeBGRA;
%typemap(newfree) uint8_t* "free($1);"
#ifdef SWIGJAVA
%include "arrays_java.i";
%include "enums.swg" /*NB: requires JDK-1.5+
See: http://www.swig.org/Doc1.3/Java.html#enumerations */
// map uint8_t* such that a byte[] is used
// this will generate a few spurious warnings in the wrapper code
%apply signed char[] { uint8_t * }
%{
/* Work around broken gcj jni.h */
#ifdef __GCJ_JNI_H__
# undef JNIEXPORT
# define JNIEXPORT
# undef JNICALL
# define JNICALL
#endif
%}
#endif
/*
* Wrapper code additions
*/
%{
#include "webp/decode.h"
#define FillMeInAsSizeCannotBeDeterminedAutomatically \
(result ? returned_buffer_size(__FUNCTION__, arg3, arg4) : 0)
static jint returned_buffer_size(
const char *function, int *width, int *height) {
static const struct sizemap {
const char *function;
int size_multiplier;
} size_map[] = {
{ "Java_com_google_webp_libwebpJNI_WebPDecodeRGB", 3 },
{ "Java_com_google_webp_libwebpJNI_WebPDecodeRGBA", 4 },
{ "Java_com_google_webp_libwebpJNI_WebPDecodeBGR", 3 },
{ "Java_com_google_webp_libwebpJNI_WebPDecodeBGRA", 4 },
{ NULL, 0 }
};
const struct sizemap *p;
jint size = -1;
for (p = size_map; p->function; p++) {
if (!strcmp(function, p->function)) {
size = *width * *height * p->size_multiplier;
break;
}
}
return size;
}
%}
// All functions, constants, etc. not named above in %ignore will be wrapped
%include "webp/decode.h"