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/* $Id$
-----------------------------------------------------------------------------
This source file is part of VideoTexture library
Copyright (c) 2007 The Zdeno Ash Miklas
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
-----------------------------------------------------------------------------
*/
// implementation
#include <PyObjectPlus.h>
#include <structmember.h>
#include "ImageViewport.h"
#include <BIF_gl.h>
#include "Texture.h"
#include "ImageBase.h"
#include "FilterSource.h"
// constructor
ImageViewport::ImageViewport (void) : m_texInit(false)
{
// get viewport rectangle
glGetIntegerv(GL_VIEWPORT, m_viewport);
// create buffer for viewport image
m_viewportImage = new BYTE [3 * getViewportSize()[0] * getViewportSize()[1]];
// set attributes
setWhole(false);
}
// destructor
ImageViewport::~ImageViewport (void)
{ delete m_viewportImage; }
// use whole viewport to capture image
void ImageViewport::setWhole (bool whole)
{
// set whole
m_whole = whole;
// set capture size to viewport size, if whole,
// otherwise place area in the middle of viewport
for (int idx = 0; idx < 2; ++idx)
{
// capture size
m_capSize[idx] = whole ? short(getViewportSize()[idx])
: calcSize(short(getViewportSize()[idx]));
// position
m_position[idx] = whole ? 0 : (getViewportSize()[idx] - m_capSize[idx]) >> 1;
}
// init image
init(m_capSize[0], m_capSize[1]);
// set capture position
setPosition();
}
void ImageViewport::setCaptureSize (short * size)
{
m_whole = false;
if (size == NULL)
size = m_capSize;
for (int idx = 0; idx < 2; ++idx)
{
if (size[idx] < 1)
m_capSize[idx] = 1;
else if (size[idx] > getViewportSize()[idx])
m_capSize[idx] = getViewportSize()[idx];
else
m_capSize[idx] = size[idx];
}
init(m_capSize[0], m_capSize[1]);
// set capture position
setPosition();
}
// set position of capture rectangle
void ImageViewport::setPosition (int * pos)
{
// if new position is not provided, use existing position
if (pos == NULL) pos = m_position;
// save position
for (int idx = 0; idx < 2; ++idx)
m_position[idx] = pos[idx] < 0 ? 0 : pos[idx] >= getViewportSize()[idx]
- m_capSize[idx] ? getViewportSize()[idx] - m_capSize[idx] : pos[idx];
// recalc up left corner
for (int idx = 0; idx < 2; ++idx)
m_upLeft[idx] = m_position[idx] + m_viewport[idx];
}
// capture image from viewport
void ImageViewport::calcImage (unsigned int texId)
{
// if scale was changed
if (m_scaleChange)
// reset image
init(m_capSize[0], m_capSize[1]);
// if texture wasn't initialized
if (!m_texInit)
{
// initialize it
loadTexture(texId, m_image, m_size);
m_texInit = true;
}
// if texture can be directly created
if (texId != 0 && m_pyfilter == NULL && m_capSize[0] == calcSize(m_capSize[0])
&& m_capSize[1] == calcSize(m_capSize[1]) && !m_flip)
{
// just copy current viewport to texture
glBindTexture(GL_TEXTURE_2D, texId);
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, m_upLeft[0], m_upLeft[1], m_capSize[0], m_capSize[1]);
// image is not available
m_avail = false;
}
// otherwise copy viewport to buffer, if image is not available
else if (!m_avail)
{
// get frame buffer data
glReadPixels(m_upLeft[0], m_upLeft[1], m_capSize[0], m_capSize[1], GL_RGB,
GL_UNSIGNED_BYTE, m_viewportImage);
// filter loaded data
FilterBGR24 filt;
filterImage(filt, m_viewportImage, m_capSize);
}
}
// cast Image pointer to ImageViewport
inline ImageViewport * getImageViewport (PyImage * self)
{ return static_cast<ImageViewport*>(self->m_image); }
// python methods
// get whole
static PyObject * ImageViewport_getWhole (PyImage * self, void * closure)
{
if (self->m_image != NULL && getImageViewport(self)->getWhole()) Py_RETURN_TRUE;
else Py_RETURN_FALSE;
}
// set whole
static int ImageViewport_setWhole (PyImage * self, PyObject * value, void * closure)
{
// check parameter, report failure
if (value == NULL || !PyBool_Check(value))
{
PyErr_SetString(PyExc_TypeError, "The value must be a bool");
return -1;
}
// set whole
if (self->m_image != NULL) getImageViewport(self)->setWhole(value == Py_True);
// success
return 0;
}
// get position
static PyObject * ImageViewport_getPosition (PyImage * self, void * closure)
{
return Py_BuildValue("(ii)", getImageViewport(self)->getPosition()[0],
getImageViewport(self)->getPosition()[1]);
}
// set position
static int ImageViewport_setPosition (PyImage * self, PyObject * value, void * closure)
{
// check validity of parameter
if (value == NULL || !PySequence_Check(value) || PySequence_Length(value) != 2
|| !PyInt_Check(PySequence_Fast_GET_ITEM(value, 0))
|| !PyInt_Check(PySequence_Fast_GET_ITEM(value, 1)))
{
PyErr_SetString(PyExc_TypeError, "The value must be a sequence of 2 ints");
return -1;
}
// set position
int pos [] = {
int(PyInt_AsLong(PySequence_Fast_GET_ITEM(value, 0))),
int(PyInt_AsLong(PySequence_Fast_GET_ITEM(value, 1)))
};
getImageViewport(self)->setPosition(pos);
// success
return 0;
}
// get capture size
static PyObject * ImageViewport_getCaptureSize (PyImage * self, void * closure)
{
return Py_BuildValue("(ii)", getImageViewport(self)->getCaptureSize()[0],
getImageViewport(self)->getCaptureSize()[1]);
}
// set capture size
static int ImageViewport_setCaptureSize (PyImage * self, PyObject * value, void * closure)
{
// check validity of parameter
if (value == NULL || !PySequence_Check(value) || PySequence_Length(value) != 2
|| !PyInt_Check(PySequence_Fast_GET_ITEM(value, 0))
|| !PyInt_Check(PySequence_Fast_GET_ITEM(value, 1)))
{
PyErr_SetString(PyExc_TypeError, "The value must be a sequence of 2 ints");
return -1;
}
// set capture size
short size [] = {
short(PyInt_AsLong(PySequence_Fast_GET_ITEM(value, 0))),
short(PyInt_AsLong(PySequence_Fast_GET_ITEM(value, 1)))
};
getImageViewport(self)->setCaptureSize(size);
// success
return 0;
}
// methods structure
static PyMethodDef imageViewportMethods[] =
{ // methods from ImageBase class
{"refresh", (PyCFunction)Image_refresh, METH_NOARGS, "Refresh image - invalidate its current content"},
{NULL}
};
// attributes structure
static PyGetSetDef imageViewportGetSets[] =
{
{"whole", (getter)ImageViewport_getWhole, (setter)ImageViewport_setWhole, "use whole viewport to capture", NULL},
{"position", (getter)ImageViewport_getPosition, (setter)ImageViewport_setPosition, "upper left corner of captured area", NULL},
{"capsize", (getter)ImageViewport_getCaptureSize, (setter)ImageViewport_setCaptureSize, "size of viewport area being captured", NULL},
// attributes from ImageBase class
{"image", (getter)Image_getImage, NULL, "image data", NULL},
{"size", (getter)Image_getSize, NULL, "image size", NULL},
{"scale", (getter)Image_getScale, (setter)Image_setScale, "fast scale of image (near neighbour)", NULL},
{"flip", (getter)Image_getFlip, (setter)Image_setFlip, "flip image vertically", NULL},
{"filter", (getter)Image_getFilter, (setter)Image_setFilter, "pixel filter", NULL},
{NULL}
};
// define python type
PyTypeObject ImageViewportType =
{
PyObject_HEAD_INIT(NULL)
0, /*ob_size*/
"VideoTexture.ImageViewport", /*tp_name*/
sizeof(PyImage), /*tp_basicsize*/
0, /*tp_itemsize*/
(destructor)Image_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*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT, /*tp_flags*/
"Image source from viewport", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
imageViewportMethods, /* tp_methods */
0, /* tp_members */
imageViewportGetSets, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc)Image_init<ImageViewport>, /* tp_init */
0, /* tp_alloc */
Image_allocNew, /* tp_new */
};
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