Doesn't reset the stream pos to 0 in CanRead().

[wxWidgets.git] / include / wx / os2 / bitmap.h

/////////////////////////////////////////////////////////////////////////////
// Name:        bitmap.h
// Purpose:     wxBitmap class
// Author:      David Webster
// Modified by:
// Created:     10/13/99
// RCS-ID:      $Id$
// Copyright:   (c) David Webster
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_BITMAP_H_
#define _WX_BITMAP_H_

#include "wx/gdiobj.h"
#include "wx/gdicmn.h"
#include "wx/palette.h"

// Bitmap
class WXDLLEXPORT wxDC;
class WXDLLEXPORT wxControl;
class WXDLLEXPORT wxBitmap;
class WXDLLEXPORT wxBitmapHandler;
class WXDLLEXPORT wxIcon;
class WXDLLEXPORT wxCursor;
class WXDLLEXPORT wxControl;

// A mask is a mono bitmap used for drawing bitmaps
// transparently.
class WXDLLEXPORT wxMask: public wxObject
{
  DECLARE_DYNAMIC_CLASS(wxMask)

public:
  wxMask();

  // Construct a mask from a bitmap and a colour indicating
  // the transparent area
  wxMask(const wxBitmap& bitmap, const wxColour& colour);

  // Construct a mask from a bitmap and a palette index indicating
  // the transparent area
  wxMask(const wxBitmap& bitmap, int paletteIndex);

  // Construct a mask from a mono bitmap (copies the bitmap).
  wxMask(const wxBitmap& bitmap);

  ~wxMask();

  bool Create(const wxBitmap& bitmap, const wxColour& colour);
  bool Create(const wxBitmap& bitmap, int paletteIndex);
  bool Create(const wxBitmap& bitmap);

  // Implementation
  inline WXHBITMAP GetMaskBitmap() const { return m_maskBitmap; }
  inline void SetMaskBitmap(WXHBITMAP bmp) { m_maskBitmap = bmp; }
protected:
  WXHBITMAP m_maskBitmap;
};

class WXDLLEXPORT wxBitmapRefData: public wxGDIRefData
{
    friend class WXDLLEXPORT wxBitmap;
    friend class WXDLLEXPORT wxIcon;
    friend class WXDLLEXPORT wxCursor;
public:
    wxBitmapRefData();
    ~wxBitmapRefData();

public:
  int           m_width;
  int           m_height;
  int           m_depth;
  bool          m_ok;
  int           m_numColors;
  wxPalette     m_bitmapPalette;
  int           m_quality;

  WXHBITMAP     m_hBitmap;
  wxDC *        m_selectedInto; // So bitmap knows whether it's been selected into

  wxMask *      m_bitmapMask; // Optional mask
};

#define M_BITMAPDATA ((wxBitmapRefData *)m_refData)

class WXDLLEXPORT wxBitmapHandler: public wxObject
{
  DECLARE_DYNAMIC_CLASS(wxBitmapHandler)
public:
  wxBitmapHandler() { m_name = ""; m_extension = ""; m_type = 0; };

  virtual bool Create(wxBitmap *bitmap, void *data, long flags, int width, int height, int depth = 1);
  virtual bool LoadFile(wxBitmap *bitmap, const wxString& name, long flags,
      int desiredWidth, int desiredHeight);
  virtual bool SaveFile(wxBitmap *bitmap, const wxString& name, int type, const wxPalette *palette = NULL);

  inline void SetName(const wxString& name) { m_name = name; }
  inline void SetExtension(const wxString& ext) { m_extension = ext; }
  inline void SetType(long type) { m_type = type; }
  inline wxString GetName() const { return m_name; }
  inline wxString GetExtension() const { return m_extension; }
  inline long GetType() const { return m_type; }
protected:
  wxString  m_name;
  wxString  m_extension;
  long      m_type;
};

#define M_BITMAPHANDLERDATA ((wxBitmapRefData *)bitmap->GetRefData())

class WXDLLEXPORT wxBitmap: public wxGDIObject
{
  DECLARE_DYNAMIC_CLASS(wxBitmap)

  friend class WXDLLEXPORT wxBitmapHandler;

public:
  wxBitmap(); // Platform-specific

  // Copy constructors
  wxBitmap(const wxBitmap& bitmap);

  // Initialize with raw data
  wxBitmap(const char bits[], int width, int height, int depth = 1);

  // Initialize with XPM data
  wxBitmap(char **data, wxControl *anItem = NULL);

  // Load a file or resource
  wxBitmap(const wxString& name, long type = wxBITMAP_TYPE_BMP_RESOURCE);

  // New constructor for generalised creation from data
  wxBitmap(void *data, long type, int width, int height, int depth = 1);

  // If depth is omitted, will create a bitmap compatible with the display
  wxBitmap(int width, int height, int depth = -1);
  ~wxBitmap();

  virtual bool Create(int width, int height, int depth = -1);
  virtual bool Create(void *data, long type, int width, int height, int depth = 1);
  virtual bool LoadFile(const wxString& name, long type = wxBITMAP_TYPE_BMP_RESOURCE);
  virtual bool SaveFile(const wxString& name, int type, const wxPalette *cmap = NULL);

  inline bool Ok() const { return (M_BITMAPDATA && M_BITMAPDATA->m_ok); }
  inline int GetWidth() const { return (M_BITMAPDATA ? M_BITMAPDATA->m_width : 0); }
  inline int GetHeight() const { return (M_BITMAPDATA ? M_BITMAPDATA->m_height : 0); }
  inline int GetDepth() const { return (M_BITMAPDATA ? M_BITMAPDATA->m_depth : 0); }
  inline int GetQuality() const { return (M_BITMAPDATA ? M_BITMAPDATA->m_quality : 0); }
  void SetWidth(int w);
  void SetHeight(int h);
  void SetDepth(int d);
  void SetQuality(int q);
  void SetOk(bool isOk);

#if WXWIN_COMPATIBILITY
  inline wxPalette *GetColourMap(void) const { return GetPalette(); }
  void SetColourMap(wxPalette *cmap) { SetPalette(*cmap); };
#endif
  inline wxPalette* GetPalette() const { return (M_BITMAPDATA ? (& M_BITMAPDATA->m_bitmapPalette) : (wxPalette*) NULL); }
  void SetPalette(const wxPalette& palette);

  inline wxMask *GetMask() const { return (M_BITMAPDATA ? M_BITMAPDATA->m_bitmapMask : (wxMask*) NULL); }
  void SetMask(wxMask *mask) ;

  inline wxBitmap& operator = (const wxBitmap& bitmap) { if (*this == bitmap) return (*this); Ref(bitmap); return *this; }

  inline bool operator == (const wxBitmap& bitmap) { return m_refData == bitmap.m_refData; }
  inline bool operator != (const wxBitmap& bitmap) { return m_refData != bitmap.m_refData; }

  // Format handling
  static inline wxList& GetHandlers() { return sm_handlers; }
  static void AddHandler(wxBitmapHandler *handler);
  static void InsertHandler(wxBitmapHandler *handler);
  static bool RemoveHandler(const wxString& name);
  static wxBitmapHandler *FindHandler(const wxString& name);
  static wxBitmapHandler *FindHandler(const wxString& extension, long bitmapType);
  static wxBitmapHandler *FindHandler(long bitmapType);

  static void InitStandardHandlers();
  static void CleanUpHandlers();
protected:
  static wxList sm_handlers;

  // Implementation
public:
  void SetHBITMAP(WXHBITMAP bmp);
  inline WXHBITMAP GetHBITMAP() const { return (M_BITMAPDATA ? M_BITMAPDATA->m_hBitmap : 0); }
  inline void SetSelectedInto(wxDC *dc) { if (M_BITMAPDATA) M_BITMAPDATA->m_selectedInto = dc; }
  inline wxDC *GetSelectedInto(void) const { return (M_BITMAPDATA ? M_BITMAPDATA->m_selectedInto : (wxDC*) NULL); }
  bool FreeResource(bool force = FALSE);

  // Creates a bitmap that matches the device context's depth, from
  // an arbitray bitmap. At present, the original bitmap must have an
  // associated palette. (TODO: use a default palette if no palette exists.)
  // This function is necessary for you to Blit an arbitrary bitmap (which may have
  // the wrong depth). wxDC::SelectObject will compare the depth of the bitmap
  // with the DC's depth, and create a new bitmap if the depths differ.
  // Eventually we should perhaps make this a public API function so that
  // an app can efficiently produce bitmaps of the correct depth.
  // The Windows solution is to use SetDibBits to blit an arbotrary DIB directly to a DC, but
  // this is too Windows-specific, hence this solution of quietly converting the wxBitmap.
  // Contributed by Frederic Villeneuve <frederic.villeneuve@natinst.com>
  wxBitmap GetBitmapForDC(wxDC& dc) const;
};
#endif
  // _WX_BITMAP_H_