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