ImageGLCanvas.h

//
// VTBuilder ImageGLCanvas.h
//
// Copyright (c) 2001-2012 Virtual Terrain Project
// Free for all uses, see license.txt for details.
//

#ifndef HELPERH
#define HELPERH

#include "vtdata/Projections.h"
#include "vtdata/MathTypes.h"

class vtMiniDatabuf;
class ImageGLCanvas;
class TilingOptions;

void WriteMiniImage(const vtString &fname, const TilingOptions &opts,
                    uchar *rgb_bytes, vtMiniDatabuf &output_buf,
                    int iUncompressedSize, ImageGLCanvas *pCanvas);
void CheckCompressionMethod(TilingOptions &opts);

#if USE_OPENGL
#include "wx/glcanvas.h"
void DoTextureCompress(uchar *rgb_bytes, vtMiniDatabuf &output_buf,
                       GLuint &iTex, bool bAlpha);

//
// ImageGLCanvas class:
//  We need to open an OpenGL context in order to do the texture compression,
//  so we may as well draw something into it, since it requires little extra
//  work, and provides interesting visual feedback to the user.
//
class ImageGLCanvas : public wxGLCanvas
{
public:
    ImageGLCanvas(wxWindow *parent, const wxWindowID id = -1, const wxPoint& pos = wxDefaultPosition,
      const wxSize& size = wxDefaultSize, long style = 0, const wxString& name = wxT(""),
      int* gl_attrib = NULL);
    ~ImageGLCanvas();

    void OnPaint(wxPaintEvent& event);
    void OnSize(wxSizeEvent& event);
    void OnEraseBackground(wxEraseEvent& event) {}  // Do nothing, to avoid flashing.

    GLuint m_iTex;
    wxGLContext *m_context;
protected:
    DECLARE_EVENT_TABLE()
};

#endif  // USE_OPENGL

#if SUPPORT_SQUISH
void DoTextureSquish(uchar *rgb_bytes, vtMiniDatabuf &output_buf, bool bFast);
#endif

#endif  // HELPERH