changed wxImage::Rescale() to return wxImage& and not void

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

/////////////////////////////////////////////////////////////////////////////
// Name:        wx/msw/bitmap.h
// Purpose:     wxBitmap class
// Author:      Julian Smart
// Modified by:
// Created:     01/02/97
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_BITMAP_H_
#define _WX_BITMAP_H_

#ifdef __GNUG__
    #pragma interface "bitmap.h"
#endif

#include "wx/msw/gdiimage.h"
#include "wx/gdicmn.h"
#include "wx/palette.h"

class WXDLLEXPORT wxDC;
class WXDLLEXPORT wxControl;
class WXDLLEXPORT wxBitmap;
class WXDLLEXPORT wxBitmapHandler;
class WXDLLEXPORT wxIcon;
class WXDLLEXPORT wxMask;
class WXDLLEXPORT wxCursor;
class WXDLLEXPORT wxControl;

// ----------------------------------------------------------------------------
// Bitmap data
//
// NB: this class is private, but declared here to make it possible inline
//     wxBitmap functions accessing it
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData
{
public:
    wxBitmapRefData();
    virtual ~wxBitmapRefData() { Free(); }

    virtual void Free();

public:
    int           m_numColors;
    wxPalette     m_bitmapPalette;
    int           m_quality;

    // MSW-specific
    // ------------

    // this field is solely for error checking: we detect selecting a bitmap
    // into more than one DC at once or deleting a bitmap still selected into a
    // DC (both are serious programming errors under Windows)
    wxDC         *m_selectedInto;

    // optional mask for transparent drawing
    wxMask       *m_bitmapMask;
};

// ----------------------------------------------------------------------------
// wxBitmap: a mono or colour bitmap
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxBitmap : public wxGDIImage
{
public:
    // default ctor creates an invalid bitmap, you must Create() it later
    wxBitmap() { Init(); }

    // Copy constructors
    wxBitmap(const wxBitmap& bitmap) { Init(); Ref(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);

    // we must have this, otherwise icons are silently copied into bitmaps using
    // the copy ctor but the resulting bitmap is invalid!
    wxBitmap(const wxIcon& icon) { Init(); CopyFromIcon(icon); }

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

    wxBitmap& operator=(const wxIcon& icon)
    {
        (void)CopyFromIcon(icon);

        return *this;
    }

    wxBitmap& operator=(const wxCursor& cursor)
    {
        (void)CopyFromCursor(cursor);

        return *this;
    }

    virtual ~wxBitmap();

    // copies the contents and mask of the given (colour) icon to the bitmap
    bool CopyFromIcon(const wxIcon& icon);

    // copies the contents and mask of the given cursor to the bitmap
    bool CopyFromCursor(const wxCursor& cursor);

    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);

    wxBitmapRefData *GetBitmapData() const { return (wxBitmapRefData *)m_refData; }

    int GetQuality() const { return (GetBitmapData() ? GetBitmapData()->m_quality : 0); }
    void SetQuality(int q);

    wxPalette* GetPalette() const { return (GetBitmapData() ? (& GetBitmapData()->m_bitmapPalette) : (wxPalette*) NULL); }
    void SetPalette(const wxPalette& palette);

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

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

#if WXWIN_COMPATIBILITY_2
    void SetOk(bool isOk);
#endif // WXWIN_COMPATIBILITY_2

#if WXWIN_COMPATIBILITY
    wxPalette *GetColourMap() const { return GetPalette(); }
    void SetColourMap(wxPalette *cmap) { SetPalette(*cmap); };
#endif // WXWIN_COMPATIBILITY

    // Implementation
public:
    void SetHBITMAP(WXHBITMAP bmp) { SetHandle((WXHANDLE)bmp); }
    WXHBITMAP GetHBITMAP() const { return (WXHBITMAP)GetHandle(); }

    void SetSelectedInto(wxDC *dc) { if (GetBitmapData()) GetBitmapData()->m_selectedInto = dc; }
    wxDC *GetSelectedInto() const { return (GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC*) NULL); }

    // 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;

protected:
    // common part of all ctors
    void Init();

    virtual wxGDIImageRefData *CreateData() const
        { return new wxBitmapRefData; }

private:
#ifdef __WIN32__
    // common part of CopyFromIcon/CopyFromCursor for Win32
    bool CopyFromIconOrCursor(const wxGDIImage& icon);
#endif // __WIN32__

    DECLARE_DYNAMIC_CLASS(wxBitmap)
};

// ----------------------------------------------------------------------------
// wxMask: a mono bitmap used for drawing bitmaps transparently.
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxMask : public wxObject
{
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);

    // construct a mask from the givne bitmap handle
    wxMask(WXHBITMAP hbmp) { m_maskBitmap = hbmp; }

    virtual ~wxMask();

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

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

protected:
    WXHBITMAP m_maskBitmap;

    DECLARE_DYNAMIC_CLASS(wxMask)
};

// ----------------------------------------------------------------------------
// wxBitmapHandler is a class which knows how to load/save bitmaps to/from file
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxBitmapHandler : public wxGDIImageHandler
{
public:
    wxBitmapHandler() { m_type = wxBITMAP_TYPE_INVALID; }
    wxBitmapHandler(const wxString& name, const wxString& ext, long type)
        : wxGDIImageHandler(name, ext, type)
    {
    }

    // keep wxBitmapHandler derived from wxGDIImageHandler compatible with the
    // old class which worked only with bitmaps
    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);

    virtual bool Create(wxGDIImage *image,
                        void *data,
                        long flags,
                        int width, int height, int depth = 1);
    virtual bool Load(wxGDIImage *image,
                      const wxString& name,
                      long flags,
                      int desiredWidth, int desiredHeight);
    virtual bool Save(wxGDIImage *image,
                      const wxString& name,
                      int type);

private:
    DECLARE_DYNAMIC_CLASS(wxBitmapHandler)
};

#endif
  // _WX_BITMAP_H_