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