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swig: add python (decode) support

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similar to Java, simple interface only

Change-Id: I8a3d344e5d89f73627e4e0cb2067512260d46fdd
(cherry picked from commit f980faf417)
This commit is contained in:
James Zern
2013-05-09 23:27:54 -07:00
parent b4f5bb6ca3
commit 6c76d28e4b
6 changed files with 5509 additions and 19 deletions
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59
swig/libwebp.i
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@ -8,15 +8,26 @@
// 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
/*
Java bindings:
$ mkdir -p java/com/google/webp
$ swig -java \
-package com.google.webp \
-outdir java/com/google/webp \
-o libwebp_java_wrap.c libwebp.i
Python bindings:
$ swig -python \
-outdir . \
-o libwebp_python_wrap.c libwebp.i
*/
#ifdef SWIGPYTHON
%module(package="com.google.webp") libwebp
#else
%module libwebp
#endif /* SWIGPYTHON */
%include "constraints.i"
%include "typemaps.i"
@ -31,6 +42,14 @@
%apply signed char[] { uint8_t* }
#endif /* SWIGJAVA */
#ifdef SWIGPYTHON
%apply (char* STRING, size_t LENGTH) { (const uint8_t* data, size_t data_size) }
%typemap(out) uint8_t* {
$result = PyString_FromStringAndSize(
(const char*)$1, ReturnedBufferSize("$symname", arg3, arg4));
}
#endif /* SWIGPYTHON */
//------------------------------------------------------------------------------
// Decoder specific
@ -76,14 +95,19 @@ int WebPGetEncoderVersion(void);
#ifdef SWIGJAVA
%{
#define FillMeInAsSizeCannotBeDeterminedAutomatically \
(result ? ReturnedBufferSize(__FUNCTION__, arg3, arg4) : 0)
(result ? (jint)ReturnedBufferSize(__FUNCTION__, arg3, arg4) : 0)
%}
#endif /* SWIGJAVA */
static jint ReturnedBufferSize(
#if defined(SWIGJAVA) || defined(SWIGPYTHON)
%{
static size_t ReturnedBufferSize(
const char* function, int* width, int* height) {
static const struct sizemap {
const char* function;
int size_multiplier;
} size_map[] = {
#ifdef SWIGJAVA
{ "Java_com_google_webp_libwebpJNI_WebPDecodeRGB", 3 },
{ "Java_com_google_webp_libwebpJNI_WebPDecodeRGBA", 4 },
{ "Java_com_google_webp_libwebpJNI_WebPDecodeARGB", 4 },
@ -97,12 +121,20 @@ static jint ReturnedBufferSize(
{ "Java_com_google_webp_libwebpJNI_wrap_1WebPEncodeLosslessBGR", 1 },
{ "Java_com_google_webp_libwebpJNI_wrap_1WebPEncodeLosslessRGBA", 1 },
{ "Java_com_google_webp_libwebpJNI_wrap_1WebPEncodeLosslessBGRA", 1 },
#endif
#ifdef SWIGPYTHON
{ "WebPDecodeRGB", 3 },
{ "WebPDecodeRGBA", 4 },
{ "WebPDecodeARGB", 4 },
{ "WebPDecodeBGR", 3 },
{ "WebPDecodeBGRA", 4 },
#endif
{ NULL, 0 }
};
const struct sizemap* p;
jint size = -1;
size_t size = 0;
for (p = size_map; p->function; p++) {
for (p = size_map; p->function; ++p) {
if (!strcmp(function, p->function)) {
size = *width * *height * p->size_multiplier;
break;
@ -112,10 +144,9 @@ static jint ReturnedBufferSize(
return size;
}
%}
#endif /* SWIGJAVA */
#endif /* SWIGJAVA || SWIGPYTHON */
%{
typedef size_t (*WebPEncodeFunction)(const uint8_t* rgb,
int width, int height, int stride,
float quality_factor, uint8_t** output);