annotate trunk/src/Modules/Output/Graphics/Devices/GraphicsOutputDeviceCairo.h @ 399:7bfed53caacf

- A few changes to get graphics working. In progress.

// Copyright 2007, Thomas Walters
//
// AIM-C: A C++ implementation of the Auditory Image Model
// http://www.acousticscale.org/AIMC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/*!
 * \file
 * \brief Output device for output to a graphics file using cairo
 *
 * \author Tom Walters <[e-mail]> and Willem van Engen <[e-mail]>
 * \date created 2007/09/17
 * \version \$Header: $
 */

#ifndef __GRAPHICS_OUTPUT_DEVICE_CAIRO_H__
#define __GRAPHICS_OUTPUT_DEVICE_CAIRO_H__

#include <stdlib.h>
#include <stdio.h>

#include "cairo.h"

#include "Modules/Output/Graphics/Devices/GraphicsOutputDevice.h"

namespace aimc {

/*!
 * \class GraphicsOutputDeviceCairo "Output/GraphicsOutputDeviceCairo.h"
 * \brief Output class for output to a graphics file using Cairo
 *
 * This class outputs a graphics operation to file. It only supports 2d though,
 * so the z-component is ignored.
 */
class GraphicsOutputDeviceCairo : public GraphicsOutputDevice {
 public:
  GraphicsOutputDeviceCairo(Parameters *pParam);
  virtual ~GraphicsOutputDeviceCairo();

  /*! \brief Initializes this output device, prepares plotting tools.
   *  \param sDir Directory or filename where to put images, max length is
   *         _MAX_PATH. Must end with slash!!!
   *  \return true on success, false on failure.
   *
   *  sDir can be either a filename, in which case the output will be
   *  to that file, or a directory, in which case it will be filled
   *  with 6-digit numbered files. A new file is then created at every
   *  call to gGrab().
   *
   *  As usual, make sure to call this function before any other. If this
   *  Initialize() failed, you shouldn't try the other functions either.
   */
  bool Initialize(const char *sDir);
  bool Initialize();
  void gGrab();
  void gBeginLineStrip();
  void gBeginQuadStrip();
  using GraphicsOutputDevice::gVertex3f; // Because we overload it
  void gVertex3f(float x, float y, float z);
  void gColor3f(float r, float g, float b);
  void gEnd();
  void gText3f(float x, float y, float z, const char *sStr, bool bRotated = false);
  void gRelease();
  unsigned char* GetBuffer();
  int GetPixelFormat();
 protected:
  /*! \brief Internal initialisation
   *
   */
  void Init();

  /*! \brief Open the file with given index for output
   *  \param index File number to open
   *  \return true on success, false on error
   *
   *  This opens a file for output and sets up the plotting library.
   */
  bool OpenFile(unsigned int index);

  //! \brief Closes a plot output file, if any is open.
  void CloseFile();

  //! \brief Set to true if the input file can be written to
  bool m_bOutputFile;
  //! \brief The Cairo plotter
  int m_iPlotHandle;
  //! \brief Output directory
  char m_sDir[PATH_MAX];
  //! \brief Current file number
  unsigned int m_iFileNumber;
  //! \brief true if this is the first vertex after gBegin()
  bool m_bIsFirstVertex;

  enum VertexType {
    VertexTypeNone,
    VertexTypeLine,
    VertexTypeQuad
  };
  //! \brief The current vertex type
  VertexType m_iVertexType;
  //! \brief Begin vertex of current quad
  float m_aPrevX[3], m_aPrevY[3];
  //! \brief Current number of quad vertices stored
  unsigned int m_iPrevVertexCount;

  //! \brief Whether to invert the colors or not
  bool m_bInvertColors;

  //! \brief Cairo Drawing Surface
  cairo_surface_t *m_cSurface;

  //! \brief Cairo Context
  cairo_t *m_cCr;

  //! \brief Internal store for the input filename
  char m_sFilename[PATH_MAX];

  unsigned int m_iWidth;
  unsigned int m_iHeight;
  bool m_bUseMemoryBuffer;
};
}  // namespace aimc
#endif /* __GRAPHICS_OUTPUT_DEVICE_CAIRO_H__ */