glprint.cpp

来自「ncbi源码」· C++ 代码 · 共 250 行

/*
 * ===========================================================================
 * PRODUCTION $Log: glprint.cpp,v $
 * PRODUCTION Revision 1000.1  2004/06/01 20:50:58  gouriano
 * PRODUCTION PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.6
 * PRODUCTION
 * ===========================================================================
 */

/*  $Id: glprint.cpp,v 1000.1 2004/06/01 20:50:58 gouriano Exp $
 * ===========================================================================
 *
 *                            PUBLIC DOMAIN NOTICE
 *               National Center for Biotechnology Information
 *
 *  This software/database is a "United States Government Work" under the
 *  terms of the United States Copyright Act.  It was written as part of
 *  the author's official duties as a United States Government employee and
 *  thus cannot be copyrighted.  This software/database is freely available
 *  to the public for use. The National Library of Medicine and the U.S.
 *  Government have not placed any restriction on its use or reproduction.
 *
 *  Although all reasonable efforts have been taken to ensure the accuracy
 *  and reliability of the software and data, the NLM and the U.S.
 *  Government do not and cannot warrant the performance or results that
 *  may be obtained by using this software or data. The NLM and the U.S.
 *  Government disclaim all warranties, express or implied, including
 *  warranties of performance, merchantability or fitness for any particular
 *  purpose.
 *
 *  Please cite the author in any work or product based on this material.
 *
 * ===========================================================================
 *
 * Authors:  Peter Meric
 *
 * File Description:
 *    GL-related printing functionality
 */


#include <ncbi_pch.hpp>
#include <gui/opengl.h>
#include <gui/opengl/glprint.hpp>
#include <gui/print/print.hpp>
#include <gui/print/print_context.hpp>
#include <gui/print/vector_buffer.hpp>
#include <gui/opengl/opengl_print_buffer.hpp>
#include <util/image/image.hpp>
#include <util/image/image_io.hpp>


BEGIN_NCBI_SCOPE


                   
void PrintVec(CFuncPtr* func, const CPrintOptions& opts)
{
    static const size_t MB = 1024 * 1024;
    GLint data_len = 0;
    //
    // GL feedback requires a fixed-size buffer large enough to
    // hold all of the feedback data. If it's not large enough
    // then we have to loop, increasing the buffer size each
    // time by a constant factor (4)
    //
    for (size_t buffer_size = MB; ; buffer_size <<= 2) {
        _TRACE(Warning << "PrintVec(): feedback buffer size: " << buffer_size << " bytes");

        typedef AutoPtr< GLfloat, ArrayDeleter<GLfloat> > TFloatArray;
        TFloatArray glbuf(new GLfloat[buffer_size]);

        glFeedbackBuffer(buffer_size, GL_3D_COLOR, glbuf.get());

        glRenderMode(GL_FEEDBACK);

        // call the GL drawing function
        (*func)();

        // switch back to render mode
        data_len = glRenderMode(GL_RENDER);
        _TRACE(Warning << "PrintVec(): GL data: " << data_len << " bytes");

        if (data_len == 0) {
            _TRACE(Warning << "PrintVec(): no GL data rendered for print");
            break;
        }
        else if (data_len < 0) {
            _TRACE(Warning << "PrintVec(): GL feedback buffer overflow");
            continue;
        }

        CRef<COpenGLPrintBuffer> pbuffer(new COpenGLPrintBuffer());
        CPrintContext ctx;
        ctx.AddBuffer(pbuffer);

        pbuffer->Parse(glbuf.get(), data_len);
        PrintContext(ctx, opts);

        ctx.RemoveBuffer(pbuffer);
        break;
    }
}


void PrintRas(CFuncPtr* func, const CPrintOptions& opts)
{
    const size_t w = opts.GetRasterWidth();
    const size_t h = opts.GetRasterHeight();
    const size_t imgsize = (w * h) << 2;
    typedef unsigned char uchar;
    AutoPtr< uchar, ArrayDeleter<uchar> > imgbuf(new uchar[imgsize]);

    // call the GL drawing function
    (*func)();

    //glReadBuffer(GL_BACK);
    glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, imgbuf.get());

    // create the CImage
    // copy the image data to the CImage buffer, reversing the row order
    CRef<CImage> img(new CImage(w, h, 4));
    unsigned char* imgptr = img->SetData();
    const size_t linesize = w << 2;
    const unsigned char* bufptr = imgbuf.get() + imgsize - linesize;
    for (size_t i = 0; i < h; ++i, imgptr += linesize, bufptr -= linesize)
    {
        memcpy(imgptr, bufptr, linesize);
    }
    CPrintOptions::TOutputFormat fmt = opts.GetOutputFormat();
    CImageIO::EType imgfmt;
    switch (fmt) {
    case CPrintOptions::ePng:
        imgfmt = CImageIO::ePng;
        break;
    case CPrintOptions::eJpeg:
        imgfmt = CImageIO::eJpeg;
        break;
    default:
        _TRACE(Error << "glprint PrintRas(): unsupported image output type");
    }

    CImageIO::WriteImage(*img, opts.GetFilename(), imgfmt);
}



END_NCBI_SCOPE


/*
 * ===========================================================================
 * $Log: glprint.cpp,v $
 * Revision 1000.1  2004/06/01 20:50:58  gouriano
 * PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.6
 *
 * Revision 1.6  2004/05/21 22:27:45  gorelenk
 * Added PCH ncbi_pch.hpp
 *
 * Revision 1.5  2003/08/15 17:08:33  meric
 * Update include paths for print-related files moved from gui/utils to gui/print
 *
 * Revision 1.4  2003/08/06 20:20:20  meric
 * Add diagnostic messages
 * Differentiate buffer overflow from an empty buffer
 *
 * Revision 1.3  2003/07/16 20:43:07  meric
 * Updated comments
 *
 * Revision 1.2  2003/07/15 21:54:43  meric
 * Added PrintRas() - raster image output
 *
 * Revision 1.1  2003/06/25 16:21:33  meric
 * Initial version
 *
 * Revision 1.20  2003/06/24 22:46:45  meric
 * Temporary fix: added includes to allow MSVC++ to compile error/warning-free.
 * These includes are for printing functionality, which will be moved shortly.
 *
 * Revision 1.19  2003/06/19 16:34:21  meric
 * Pass file type parameter to CAppPopup::PopupFile
 *
 * Revision 1.18  2003/06/19 00:54:58  dicuccio
 * Minor reformatting.  Changed LOG_POST() to _TRACE().
 *
 * Revision 1.17  2003/06/18 19:44:40  meric
 * Print: loop to increase size of feedback buffer as necessary
 *
 * Revision 1.16  2003/06/18 17:26:57  meric
 * Final phase of print reorg: print classes now in gui/utils
 *
 * Revision 1.15  2003/06/17 19:34:32  meric
 * Call CAppPopup::PopupFile() instead of CAppPopup::Popup()
 *
 * Revision 1.14  2003/06/17 12:08:42  meric
 * Fixed CVectorOutput to include separate call to SetOutputStream()
 * Remove static keyword from s_Print (anachronism)
 *
 * Revision 1.13  2003/06/16 21:20:31  meric
 * Changed auto_ptr<> to CRef<> on a CObject-derived class (COpenGLPrintBuffer)
 *
 * Revision 1.12  2003/06/16 19:10:59  meric
 * Remove print buffer from print context before the context is destroyed. (this
 * code was 'lost' in the previous update).
 *
 * Revision 1.11  2003/06/16 16:56:10  dicuccio
 * Fix compiler error for MSVC
 *
 * Revision 1.10  2003/06/16 15:59:10  dicuccio
 * Work-in-progress: everything compiles, still much reorganization to be done.
 * Moved generic functionality out of opengl/print/ and into gui/utils (print
 * options, print dialogs, etc.).  Removed interactive state from CGlCanvas.
 * Added hook in CView for opening standard print dialog, and for generic print
 * handling.  Restored log for glcanvas.cpp
 *
 * Revision 1.9  2003/06/13 18:44:04  meric
 * Initialization in x_Init(), which is called by all c'tors
 * Remove print-related functinality from draw(), which can now be
 * overridden freely without affecting the Print() function.
 * Add print functions [ Print(), x_Print() etc ]
 *
 * Revision 1.8  2003/05/22 15:51:06  meric
 * small changes to GL Feedback code (remains commented out)
 *
 * Revision 1.7  2003/05/13 19:25:20  dicuccio
 * Prepare CGlCanvas for printing support (Peter Meric)
 *
 * Revision 1.6  2003/05/06 15:59:44  dicuccio
 * Split CGlCanvas into 2D and 3D versions; moved hardware check into CGlUtils
 *
 * Revision 1.5  2003/03/28 17:16:01  dicuccio
 * Added first support for testing for hardware acceleration
 *
 * Revision 1.4  2003/01/13 13:10:11  dicuccio
 * Namespace clean-up.  Retired namespace gui -> converted all to namespace
 * ncbi.  Moved all FLUID-generated code into namespace ncbi.
 *
 * Revision 1.3  2002/11/14 16:24:44  dicuccio
 * Changed to include standard OpenGL headers through 'gui/opengl.h'
 *
 * Revision 1.2  2002/11/08 13:27:45  dicuccio
 * Code clean-up and reformatting.
 *
 * Revision 1.1  2002/11/05 20:21:47  dicuccio
 * Initial revision
 *
 * ===========================================================================
 */