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screenshot.c

/* $Id: screenshot.c 113 2009-02-15 20:30:17Z mmmaddd $ */

/*
      G3DViewer - 3D object viewer

      Copyright (C) 2005, 2006  Markus Dahms <mad@automagically.de>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU 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 General Public License for more details.

    You should have received a copy of the GNU 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
*/

#ifdef HAVE_CONFIG_H
#     include <config.h>
#endif

#include <gdk-pixbuf/gdk-pixbuf.h>
#include <GL/gl.h>

static guint8 *screenshot_get_pixels(guint32 width, guint32 height)
{
      guint8 *pixels;

      pixels = g_new(guint8, width * height * 4);

      glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);

      return pixels;
}

gboolean screenshot_save_from_pixels(guint8 *pixels, const gchar *filename,
      guint32 width, guint32 height)
{
      GdkPixbuf *pixbuf, *flipped;

      g_return_val_if_fail(pixels != NULL, FALSE);

      pixbuf = gdk_pixbuf_new_from_data(pixels,
            GDK_COLORSPACE_RGB, TRUE,
            8, width, height, width * 4,
            NULL, NULL);

      if(pixbuf == NULL)
            return FALSE;

      /* GL returns pixels starting from lower left corner */
      flipped = gdk_pixbuf_flip(pixbuf, FALSE);

      if(flipped == NULL)
            return FALSE;

      gdk_pixbuf_save(flipped, filename, "png", NULL, NULL);

      gdk_pixbuf_unref(pixbuf);
      gdk_pixbuf_unref(flipped);

      return TRUE;
}

gboolean screenshot_save(const gchar *filename, guint32 width, guint32 height)
{
      guint8 *pixels;
      gboolean retval;

      pixels = screenshot_get_pixels(width, height);
      retval = screenshot_save_from_pixels(pixels, filename, width, height);
      g_free(pixels);
      return retval;
}


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