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/*
* The Python Imaging Library.
* $Id: encode.c 2751 2006-06-18 19:50:45Z fredrik $
*
* standard encoder interfaces for the Imaging library
*
* History:
* 1996-04-19 fl Based on decoders.c
* 1996-05-12 fl Compile cleanly as C++
* 1996-12-30 fl Plugged potential memory leak for tiled images
* 1997-01-03 fl Added GIF encoder
* 1997-01-05 fl Plugged encoder buffer leaks
* 1997-01-11 fl Added encode_to_file method
* 1998-03-09 fl Added mode/rawmode argument to encoders
* 1998-07-09 fl Added interlace argument to GIF encoder
* 1999-02-07 fl Added PCX encoder
*
* Copyright (c) 1997-2001 by Secret Labs AB
* Copyright (c) 1996-1997 by Fredrik Lundh
*
* See the README file for information on usage and redistribution.
*/
/* FIXME: make these pluggable! */
#include "Python.h"
#if PY_VERSION_HEX < 0x01060000
#define PyObject_New PyObject_NEW
#define PyObject_Del PyMem_DEL
#endif
#include "Imaging.h"
#include "Gif.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* write */
#endif
/* -------------------------------------------------------------------- */
/* Common */
/* -------------------------------------------------------------------- */
typedef struct {
PyObject_HEAD
int (*encode)(Imaging im, ImagingCodecState state,
UINT8* buffer, int bytes);
struct ImagingCodecStateInstance state;
Imaging im;
PyObject* lock;
} ImagingEncoderObject;
static PyTypeObject ImagingEncoderType;
static ImagingEncoderObject*
PyImaging_EncoderNew(int contextsize)
{
ImagingEncoderObject *encoder;
void *context;
Py_TYPE(&ImagingEncoderType) = &PyType_Type;
encoder = PyObject_New(ImagingEncoderObject, &ImagingEncoderType);
if (encoder == NULL)
return NULL;
/* Clear the encoder state */
memset(&encoder->state, 0, sizeof(encoder->state));
/* Allocate encoder context */
if (contextsize > 0) {
context = (void*) calloc(1, contextsize);
if (!context) {
Py_DECREF(encoder);
PyErr_NoMemory();
return NULL;
}
} else
context = 0;
/* Initialize encoder context */
encoder->state.context = context;
/* Target image */
encoder->lock = NULL;
encoder->im = NULL;
return encoder;
}
static void
_dealloc(ImagingEncoderObject* encoder)
{
free(encoder->state.buffer);
free(encoder->state.context);
Py_XDECREF(encoder->lock);
PyObject_Del(encoder);
}
static PyObject*
_encode(ImagingEncoderObject* encoder, PyObject* args)
{
PyObject* buf;
PyObject* result;
int status;
/* Encode to a Python string (allocated by this method) */
int bufsize = 16384;
if (!PyArg_ParseTuple(args, "|i", &bufsize))
return NULL;
buf = PyBytes_FromStringAndSize(NULL, bufsize);
if (!buf)
return NULL;
status = encoder->encode(encoder->im, &encoder->state,
(UINT8*) PyBytes_AsString(buf), bufsize);
/* adjust string length to avoid slicing in encoder */
if (_PyBytes_Resize(&buf, (status > 0) ? status : 0) < 0)
return NULL;
result = Py_BuildValue("iiO", status, encoder->state.errcode, buf);
Py_DECREF(buf); /* must release buffer!!! */
return result;
}
static PyObject*
_encode_to_file(ImagingEncoderObject* encoder, PyObject* args)
{
UINT8* buf;
int status;
ImagingSectionCookie cookie;
/* Encode to a file handle */
int fh;
int bufsize = 16384;
if (!PyArg_ParseTuple(args, "i|i", &fh, &bufsize))
return NULL;
/* Allocate an encoder buffer */
buf = (UINT8*) malloc(bufsize);
if (!buf) {
PyErr_NoMemory();
return NULL;
}
ImagingSectionEnter(&cookie);
do {
/* This replaces the inner loop in the ImageFile _save
function. */
status = encoder->encode(encoder->im, &encoder->state, buf, bufsize);
if (status > 0)
if (write(fh, buf, status) < 0) {
ImagingSectionLeave(&cookie);
free(buf);
return PyErr_SetFromErrno(PyExc_IOError);
}
} while (encoder->state.errcode == 0);
ImagingSectionLeave(&cookie);
free(buf);
return Py_BuildValue("i", encoder->state.errcode);
}
extern Imaging PyImaging_AsImaging(PyObject *op);
static PyObject*
_setimage(ImagingEncoderObject* encoder, PyObject* args)
{
PyObject* op;
Imaging im;
ImagingCodecState state;
int x0, y0, x1, y1;
/* Define where image data should be stored */
x0 = y0 = x1 = y1 = 0;
/* FIXME: should publish the ImagingType descriptor */
if (!PyArg_ParseTuple(args, "O|(iiii)", &op, &x0, &y0, &x1, &y1))
return NULL;
im = PyImaging_AsImaging(op);
if (!im)
return NULL;
encoder->im = im;
state = &encoder->state;
if (x0 == 0 && x1 == 0) {
state->xsize = im->xsize;
state->ysize = im->ysize;
} else {
state->xoff = x0;
state->yoff = y0;
state->xsize = x1 - x0;
state->ysize = y1 - y0;
}
if (state->xsize <= 0 ||
state->xsize + state->xoff > im->xsize ||
state->ysize <= 0 ||
state->ysize + state->yoff > im->ysize) {
PyErr_SetString(PyExc_SystemError, "tile cannot extend outside image");
return NULL;
}
/* Allocate memory buffer (if bits field is set) */
if (state->bits > 0) {
state->bytes = (state->bits * state->xsize+7)/8;
state->buffer = (UINT8*) malloc(state->bytes);
if (!state->buffer) {
PyErr_NoMemory();
return NULL;
}
}
/* Keep a reference to the image object, to make sure it doesn't
go away before we do */
Py_INCREF(op);
Py_XDECREF(encoder->lock);
encoder->lock = op;
Py_INCREF(Py_None);
return Py_None;
}
static struct PyMethodDef methods[] = {
{"encode", (PyCFunction)_encode, 1},
{"encode_to_file", (PyCFunction)_encode_to_file, 1},
{"setimage", (PyCFunction)_setimage, 1},
{NULL, NULL} /* sentinel */
};
static PyTypeObject ImagingEncoderType = {
PyVarObject_HEAD_INIT(NULL, 0)
"ImagingEncoder", /*tp_name*/
sizeof(ImagingEncoderObject), /*tp_size*/
0, /*tp_itemsize*/
/* methods */
(destructor)_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /* tp_getattr*/
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
0, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
methods, /* tp_methods */
};
/* -------------------------------------------------------------------- */
int
get_packer(ImagingEncoderObject* encoder, const char* mode,
const char* rawmode)
{
int bits;
ImagingShuffler pack;
pack = ImagingFindPacker(mode, rawmode, &bits);
if (!pack) {
Py_DECREF(encoder);
PyErr_SetString(PyExc_SystemError, "unknown raw mode");
return -1;
}
encoder->state.shuffle = pack;
encoder->state.bits = bits;
return 0;
}
/* -------------------------------------------------------------------- */
/* EPS */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_EpsEncoderNew(PyObject* self, PyObject* args)
{
ImagingEncoderObject* encoder;
encoder = PyImaging_EncoderNew(0);
if (encoder == NULL)
return NULL;
encoder->encode = ImagingEpsEncode;
return (PyObject*) encoder;
}
/* -------------------------------------------------------------------- */
/* GIF */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_GifEncoderNew(PyObject* self, PyObject* args)
{
ImagingEncoderObject* encoder;
char *mode;
char *rawmode;
int bits = 8;
int interlace = 0;
if (!PyArg_ParseTuple(args, "ss|ii", &mode, &rawmode, &bits, &interlace))
return NULL;
encoder = PyImaging_EncoderNew(sizeof(GIFENCODERSTATE));
if (encoder == NULL)
return NULL;
if (get_packer(encoder, mode, rawmode) < 0)
return NULL;
encoder->encode = ImagingGifEncode;
((GIFENCODERSTATE*)encoder->state.context)->bits = bits;
((GIFENCODERSTATE*)encoder->state.context)->interlace = interlace;
return (PyObject*) encoder;
}
/* -------------------------------------------------------------------- */
/* PCX */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_PcxEncoderNew(PyObject* self, PyObject* args)
{
ImagingEncoderObject* encoder;
char *mode;
char *rawmode;
int bits = 8;
if (!PyArg_ParseTuple(args, "ss|ii", &mode, &rawmode, &bits))
return NULL;
encoder = PyImaging_EncoderNew(0);
if (encoder == NULL)
return NULL;
if (get_packer(encoder, mode, rawmode) < 0)
return NULL;
encoder->encode = ImagingPcxEncode;
return (PyObject*) encoder;
}
/* -------------------------------------------------------------------- */
/* RAW */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_RawEncoderNew(PyObject* self, PyObject* args)
{
ImagingEncoderObject* encoder;
char *mode;
char *rawmode;
int stride = 0;
int ystep = 1;
if (!PyArg_ParseTuple(args, "ss|ii", &mode, &rawmode, &stride, &ystep))
return NULL;
encoder = PyImaging_EncoderNew(0);
if (encoder == NULL)
return NULL;
if (get_packer(encoder, mode, rawmode) < 0)
return NULL;
encoder->encode = ImagingRawEncode;
encoder->state.ystep = ystep;
encoder->state.count = stride;
return (PyObject*) encoder;
}
/* -------------------------------------------------------------------- */
/* XBM */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_XbmEncoderNew(PyObject* self, PyObject* args)
{
ImagingEncoderObject* encoder;
encoder = PyImaging_EncoderNew(0);
if (encoder == NULL)
return NULL;
if (get_packer(encoder, "1", "1;R") < 0)
return NULL;
encoder->encode = ImagingXbmEncode;
return (PyObject*) encoder;
}
/* -------------------------------------------------------------------- */
/* ZIP */
/* -------------------------------------------------------------------- */
#ifdef HAVE_LIBZ
#include "Zip.h"
PyObject*
PyImaging_ZipEncoderNew(PyObject* self, PyObject* args)
{
ImagingEncoderObject* encoder;
char* mode;
char* rawmode;
int optimize = 0;
char* dictionary = NULL;
int dictionary_size = 0;
if (!PyArg_ParseTuple(args, "ss|is#", &mode, &rawmode, &optimize,
&dictionary, &dictionary_size))
return NULL;
encoder = PyImaging_EncoderNew(sizeof(ZIPSTATE));
if (encoder == NULL)
return NULL;
if (get_packer(encoder, mode, rawmode) < 0)
return NULL;
encoder->encode = ImagingZipEncode;
if (rawmode[0] == 'P')
/* disable filtering */
((ZIPSTATE*)encoder->state.context)->mode = ZIP_PNG_PALETTE;
((ZIPSTATE*)encoder->state.context)->optimize = optimize;
((ZIPSTATE*)encoder->state.context)->dictionary = dictionary;
((ZIPSTATE*)encoder->state.context)->dictionary_size = dictionary_size;
return (PyObject*) encoder;
}
#endif
/* -------------------------------------------------------------------- */
/* JPEG */
/* -------------------------------------------------------------------- */
#ifdef HAVE_LIBJPEG
/* We better define this encoder last in this file, so the following
undef's won't mess things up for the Imaging library proper. */
#undef HAVE_PROTOTYPES
#undef HAVE_STDDEF_H
#undef HAVE_STDLIB_H
#undef UINT8
#undef UINT16
#undef UINT32
#undef INT8
#undef INT16
#undef INT32
#include "Jpeg.h"
PyObject*
PyImaging_JpegEncoderNew(PyObject* self, PyObject* args)
{
ImagingEncoderObject* encoder;
char *mode;
char *rawmode;
int quality = 0;
int progressive = 0;
int smooth = 0;
int optimize = 0;
int streamtype = 0; /* 0=interchange, 1=tables only, 2=image only */
int xdpi = 0, ydpi = 0;
if (!PyArg_ParseTuple(args, "ss|iiiiiii", &mode, &rawmode, &quality,
&progressive, &smooth, &optimize, &streamtype,
&xdpi, &ydpi))
return NULL;
encoder = PyImaging_EncoderNew(sizeof(JPEGENCODERSTATE));
if (encoder == NULL)
return NULL;
if (get_packer(encoder, mode, rawmode) < 0)
return NULL;
encoder->encode = ImagingJpegEncode;
((JPEGENCODERSTATE*)encoder->state.context)->quality = quality;
((JPEGENCODERSTATE*)encoder->state.context)->progressive = progressive;
((JPEGENCODERSTATE*)encoder->state.context)->smooth = smooth;
((JPEGENCODERSTATE*)encoder->state.context)->optimize = optimize;
((JPEGENCODERSTATE*)encoder->state.context)->streamtype = streamtype;
((JPEGENCODERSTATE*)encoder->state.context)->xdpi = xdpi;
((JPEGENCODERSTATE*)encoder->state.context)->ydpi = ydpi;
return (PyObject*) encoder;
}
#endif
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