1. added support for bitmaps with alpha channel

[wxWidgets.git] / include / wx / image.h

diff --git a/include/wx/image.h b/include/wx/image.h
index 0b7cc551b26ae61151b57ad4a5a501a7edfb984d..153065c764b3cb2a537929c65d164d9a26e439bf 100644 (file)
--- a/include/wx/image.h
+++ b/include/wx/image.h
@@ -10,7 +10,7 @@
 #ifndef _WX_IMAGE_H_
 #define _WX_IMAGE_H_
 
 #ifndef _WX_IMAGE_H_
 #define _WX_IMAGE_H_
 

-#ifdef __GNUG__
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)

 #pragma interface "image.h"
 #endif
 
 #pragma interface "image.h"
 #endif
 


@@ -18,34 +18,27 @@
 #include "wx/object.h"
 #include "wx/string.h"
 #include "wx/gdicmn.h"
 #include "wx/object.h"
 #include "wx/string.h"
 #include "wx/gdicmn.h"

-#include "wx/bitmap.h"
+#include "wx/hashmap.h"

 
 #if wxUSE_STREAMS
 #  include "wx/stream.h"
 #endif
 
 
 #if wxUSE_STREAMS
 #  include "wx/stream.h"
 #endif
 

+#if wxUSE_IMAGE
+
+// on some systems (Unixware 7.x) index is defined as a macro in the headers
+// which breaks the compilation below
+#undef index
+
+#define wxIMAGE_OPTION_FILENAME wxString(_T("FileName"))
+

 //-----------------------------------------------------------------------------
 // classes
 //-----------------------------------------------------------------------------
 
 class WXDLLEXPORT wxImageHandler;
 //-----------------------------------------------------------------------------
 // classes
 //-----------------------------------------------------------------------------
 
 class WXDLLEXPORT wxImageHandler;

-#if wxUSE_LIBPNG
-class WXDLLEXPORT wxPNGHandler;
-#endif
-#if wxUSE_LIBJPEG
-class WXDLLEXPORT wxJPEGHandler;
-#endif
-class WXDLLEXPORT wxBMPHandler;
-#if wxUSE_GIF
-class WXDLLEXPORT wxGIFHandler;
-#endif
-#if wxUSE_PNM
-class WXDLLEXPORT wxPNMHandler;
-#endif
-#if wxUSE_PCX
-class WXDLLEXPORT wxPCXHandler;
-#endif

 class WXDLLEXPORT wxImage;
 class WXDLLEXPORT wxImage;

+class WXDLLEXPORT wxPalette;

 
 //-----------------------------------------------------------------------------
 // wxImageHandler
 
 //-----------------------------------------------------------------------------
 // wxImageHandler


@@ -53,305 +46,294 @@ class WXDLLEXPORT wxImage;
 
 class WXDLLEXPORT wxImageHandler: public wxObject
 {
 
 class WXDLLEXPORT wxImageHandler: public wxObject
 {

-  DECLARE_DYNAMIC_CLASS(wxImageHandler)
-

 public:
 public:

-  wxImageHandler() { m_name = ""; m_extension = ""; m_type = 0; }
+    wxImageHandler()
+        : m_name(wxEmptyString), m_extension(wxEmptyString), m_mime(), m_type(0)
+        { }

 
 #if wxUSE_STREAMS
 
 #if wxUSE_STREAMS

-  virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=TRUE );
-  virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=TRUE );
-
-  bool CanRead( wxInputStream& stream ) { return DoCanRead(stream); }
-  bool CanRead( const wxString& name );
-#endif
-
-  void SetName(const wxString& name) { m_name = name; }
-  void SetExtension(const wxString& ext) { m_extension = ext; }
-  void SetType(long type) { m_type = type; }
-  void SetMimeType(const wxString& type) { m_mime = type; }
-  wxString GetName() const { return m_name; }
-  wxString GetExtension() const { return m_extension; }
-  long GetType() const { return m_type; }
-  wxString GetMimeType() const { return m_mime; }
-
-protected:
-  virtual bool DoCanRead( wxInputStream& stream ) = 0;
-
-  wxString  m_name;
-  wxString  m_extension;
-  wxString  m_mime;
-  long      m_type;
-
-};
-
-//-----------------------------------------------------------------------------
-// wxPNGHandler
-//-----------------------------------------------------------------------------
+    virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=TRUE, int index=-1 );
+    virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=TRUE );

 
 

-#if wxUSE_LIBPNG
-class WXDLLEXPORT wxPNGHandler: public wxImageHandler
-{
-  DECLARE_DYNAMIC_CLASS(wxPNGHandler)
+    virtual int GetImageCount( wxInputStream& stream );

 
 

-public:
+    bool CanRead( wxInputStream& stream ) { return CallDoCanRead(stream); }
+    bool CanRead( const wxString& name );
+#endif // wxUSE_STREAMS

 
 

-  inline wxPNGHandler()
-  {
-      m_name = "PNG file";
-      m_extension = "png";
-      m_type = wxBITMAP_TYPE_PNG;
-      m_mime = "image/png";
-  };
+    void SetName(const wxString& name) { m_name = name; }
+    void SetExtension(const wxString& ext) { m_extension = ext; }
+    void SetType(long type) { m_type = type; }
+    void SetMimeType(const wxString& type) { m_mime = type; }
+    wxString GetName() const { return m_name; }
+    wxString GetExtension() const { return m_extension; }
+    long GetType() const { return m_type; }
+    wxString GetMimeType() const { return m_mime; }

 
 

+protected:

 #if wxUSE_STREAMS
 #if wxUSE_STREAMS

-  virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=TRUE );
-  virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=TRUE );
-  virtual bool DoCanRead( wxInputStream& stream );
-#endif
-};
-#endif
-
-//-----------------------------------------------------------------------------
-// wxJPEGHandler
-//-----------------------------------------------------------------------------
+    virtual bool DoCanRead( wxInputStream& stream ) = 0;

 
 

-#if wxUSE_LIBJPEG
-class WXDLLEXPORT wxJPEGHandler: public wxImageHandler
-{
-  DECLARE_DYNAMIC_CLASS(wxJPEGHandler)
-
-public:
+    // save the stream position, call DoCanRead() and restore the position
+    bool CallDoCanRead(wxInputStream& stream);
+#endif // wxUSE_STREAMS

 
 

-  inline wxJPEGHandler()
-  {
-      m_name = "JPEG file";
-      m_extension = "jpg";
-      m_type = wxBITMAP_TYPE_JPEG;
-      m_mime = "image/jpeg";
-  };
+    wxString  m_name;
+    wxString  m_extension;
+    wxString  m_mime;
+    long      m_type;

 
 

-#if wxUSE_STREAMS
-  virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=TRUE );
-  virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=TRUE );
-  virtual bool DoCanRead( wxInputStream& stream );
-#endif
+private:
+    DECLARE_CLASS(wxImageHandler)

 };
 };

-#endif

 
 //-----------------------------------------------------------------------------
 
 //-----------------------------------------------------------------------------

-// wxBMPHandler
+// wxImageHistogram

 //-----------------------------------------------------------------------------
 
 //-----------------------------------------------------------------------------
 

-class WXDLLEXPORT wxBMPHandler: public wxImageHandler
+class WXDLLEXPORT wxImageHistogramEntry

 {
 {

-  DECLARE_DYNAMIC_CLASS(wxBMPHandler)
-

 public:
 public:

-
-  inline wxBMPHandler()
-  {
-      m_name = "BMP file";
-      m_extension = "bmp";
-      m_type = wxBITMAP_TYPE_BMP;
-      m_mime = "image/bmp";
-  };
-
-#if wxUSE_STREAMS
-  virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=TRUE );
-  virtual bool DoCanRead( wxInputStream& stream );
-#endif
+    wxImageHistogramEntry() { index = value = 0; }
+    unsigned long index;
+    unsigned long value;

 };
 
 };
 

-//-----------------------------------------------------------------------------
-// wxGIFHandler
-//-----------------------------------------------------------------------------
-
-#if wxUSE_GIF
+WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
+                             wxIntegerHash, wxIntegerEqual,
+                             wxImageHistogramBase);

 
 

-class WXDLLEXPORT wxGIFHandler : public wxImageHandler
+class WXDLLEXPORT wxImageHistogram : public wxImageHistogramBase

 {
 {

-  DECLARE_DYNAMIC_CLASS(wxGIFHandler)
-

 public:
 public:

-
-  inline wxGIFHandler()
-  {
-      m_name = "GIF file";
-      m_extension = "gif";
-      m_type = wxBITMAP_TYPE_GIF;
-      m_mime = "image/gif";
-  };
-
-#if wxUSE_STREAMS
-  virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=TRUE );
-  virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=TRUE );
-  virtual bool DoCanRead( wxInputStream& stream );
-#endif
+    wxImageHistogram() : wxImageHistogramBase(256) { }
+
+    // get the key in the histogram for the given RGB values
+    static unsigned long MakeKey(unsigned char r,
+                                 unsigned char g,
+                                 unsigned char b)
+    {
+        return (r << 16) | (g << 8) | b;
+    }
+
+    // find first colour that is not used in the image and has higher
+    // RGB values than RGB(startR, startG, startB)
+    //
+    // returns true and puts this colour in r, g, b (each of which may be NULL)
+    // on success or returns false if there are no more free colours
+    bool FindFirstUnusedColour(unsigned char *r,
+                               unsigned char *g,
+                               unsigned char *b,
+                               unsigned char startR = 1,
+                               unsigned char startG = 0,
+                               unsigned char startB = 0 ) const;

 };
 };

-#endif

 
 //-----------------------------------------------------------------------------
 
 //-----------------------------------------------------------------------------

-// wxPNMHandler
+// wxImage

 //-----------------------------------------------------------------------------
 
 //-----------------------------------------------------------------------------
 

-#if wxUSE_PNM
-class WXDLLEXPORT wxPNMHandler : public wxImageHandler
+class WXDLLEXPORT wxImage: public wxObject

 {
 {

-  DECLARE_DYNAMIC_CLASS(wxPNMHandler)
-

 public:
 public:

-
-  inline wxPNMHandler()
-  {
-      m_name = "PNM file";
-      m_extension = "pnm";
-      m_type = wxBITMAP_TYPE_PNM;
-      m_mime = "image/pnm";
-  };
+    wxImage();
+    wxImage( int width, int height, bool clear = true );
+    wxImage( int width, int height, unsigned char* data, bool static_data = FALSE );
+    wxImage( const wxString& name, long type = wxBITMAP_TYPE_ANY, int index = -1 );
+    wxImage( const wxString& name, const wxString& mimetype, int index = -1 );

 
 #if wxUSE_STREAMS
 
 #if wxUSE_STREAMS

-  virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=TRUE );
-  virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=TRUE );
-  virtual bool DoCanRead( wxInputStream& stream );
-#endif
-};
-#endif
-
-//-----------------------------------------------------------------------------
-// wxPCXHandler
-//-----------------------------------------------------------------------------
+    wxImage( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY, int index = -1 );
+    wxImage( wxInputStream& stream, const wxString& mimetype, int index = -1 );
+#endif // wxUSE_STREAMS

 
 

-#if wxUSE_PCX
-class WXDLLEXPORT wxPCXHandler : public wxImageHandler
-{
-  DECLARE_DYNAMIC_CLASS(wxPCXHandler)
+    wxImage( const wxImage& image );
+    wxImage( const wxImage* image );

 
 

-public:
+    bool Create( int width, int height, bool clear = true );
+    bool Create( int width, int height, unsigned char* data, bool static_data = FALSE );
+    void Destroy();

 
 

-  inline wxPCXHandler()
-  {
-      m_name = "PCX file";
-      m_extension = "pcx";
-      m_type = wxBITMAP_TYPE_PCX;
-      m_mime = "image/pcx";
-  };
+    // creates an identical copy of the image (the = operator
+    // just raises the ref count)
+    wxImage Copy() const;

 
 

-#if wxUSE_STREAMS
-  virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=TRUE );
-  virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=TRUE );
-  virtual bool DoCanRead( wxInputStream& stream );
-#endif // wxUSE_STREAMS
-};
-#endif // wxUSE_PCX
+    // return the new image with size width*height
+    wxImage GetSubImage( const wxRect& ) const;

 
 

-//-----------------------------------------------------------------------------
-// wxImage
-//-----------------------------------------------------------------------------
+    // pastes image into this instance and takes care of
+    // the mask colour and out of bounds problems
+    void Paste( const wxImage &image, int x, int y );

 
 

-class WXDLLEXPORT wxImage: public wxObject
-{
-  DECLARE_DYNAMIC_CLASS(wxImage)
+    // return the new image with size width*height
+    wxImage Scale( int width, int height ) const;

 
 

-  friend class WXDLLEXPORT wxImageHandler;
+    wxImage ShrinkBy( int xFactor , int yFactor ) const ;

 
 

-public:
+    // rescales the image in place
+    wxImage& Rescale( int width, int height ) { return *this = Scale(width, height); }

 
 

-  wxImage();
-  wxImage( int width, int height );
-  wxImage( const wxString& name, long type = wxBITMAP_TYPE_ANY );
-  wxImage( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY );
-  wxImage( const wxString& name, const wxString& mimetype );
-  wxImage( wxInputStream& stream, const wxString& mimetype );
+    // Rotates the image about the given point, 'angle' radians.
+    // Returns the rotated image, leaving this image intact.
+    wxImage Rotate(double angle, const wxPoint & centre_of_rotation,
+                   bool interpolating = TRUE, wxPoint * offset_after_rotation = (wxPoint*) NULL) const;

 
 

-  wxImage( const wxImage& image );
-  wxImage( const wxImage* image );
+    wxImage Rotate90( bool clockwise = TRUE ) const;
+    wxImage Mirror( bool horizontally = TRUE ) const;

 
 

-  // these functions get implemented in /src/(platform)/bitmap.cpp
-  wxImage( const wxBitmap &bitmap );
-  operator wxBitmap() const { return ConvertToBitmap(); }
-  wxBitmap ConvertToBitmap() const;
+    // replace one colour with another
+    void Replace( unsigned char r1, unsigned char g1, unsigned char b1,
+                  unsigned char r2, unsigned char g2, unsigned char b2 );

 
 

-  void Create( int width, int height );
-  void Destroy();
+    // convert to monochrome image (<r,g,b> will be replaced by white,
+    // everything else by black)
+    wxImage ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const;

 
 

-  // return the new image with size width*height
-  wxImage GetSubImage( const wxRect& ) const;
+    // these routines are slow but safe
+    void SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b );
+    unsigned char GetRed( int x, int y ) const;
+    unsigned char GetGreen( int x, int y ) const;
+    unsigned char GetBlue( int x, int y ) const;

 
 

-  // return the new image with size width*height
-  wxImage Scale( int width, int height ) const;
+    void SetAlpha(int x, int y, unsigned char alpha);
+    unsigned char GetAlpha(int x, int y) const;

 
 

-  // rescales the image in place
-  void Rescale( int width, int height ) { *this = Scale(width, height); }
+    // find first colour that is not used in the image and has higher
+    // RGB values than <startR,startG,startB>
+    bool FindFirstUnusedColour( unsigned char *r, unsigned char *g, unsigned char *b,
+                                unsigned char startR = 1, unsigned char startG = 0,
+                                unsigned char startB = 0 ) const;
+    // Set image's mask to the area of 'mask' that has <r,g,b> colour
+    bool SetMaskFromImage(const wxImage & mask,
+                          unsigned char mr, unsigned char mg, unsigned char mb);

 
 

-  // these routines are slow but safe
-  void SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b );
-  unsigned char GetRed( int x, int y );
-  unsigned char GetGreen( int x, int y );
-  unsigned char GetBlue( int x, int y );
+    // converts image's alpha channel to mask, if it has any, does nothing
+    // otherwise:
+    bool ConvertAlphaToMask(unsigned char threshold = 128);

 
 

-  virtual bool LoadFile( const wxString& name, long type = wxBITMAP_TYPE_ANY );
-  virtual bool LoadFile( const wxString& name, const wxString& mimetype );
+    static bool CanRead( const wxString& name );
+    static int GetImageCount( const wxString& name, long type = wxBITMAP_TYPE_ANY );
+    virtual bool LoadFile( const wxString& name, long type = wxBITMAP_TYPE_ANY, int index = -1 );
+    virtual bool LoadFile( const wxString& name, const wxString& mimetype, int index = -1 );

 
 #if wxUSE_STREAMS
 
 #if wxUSE_STREAMS

-  virtual bool LoadFile( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY );
-  virtual bool LoadFile( wxInputStream& stream, const wxString& mimetype );
+    static bool CanRead( wxInputStream& stream );
+    static int GetImageCount( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY );
+    virtual bool LoadFile( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY, int index = -1 );
+    virtual bool LoadFile( wxInputStream& stream, const wxString& mimetype, int index = -1 );

 #endif
 
 #endif
 

-  virtual bool SaveFile( const wxString& name, int type );
-  virtual bool SaveFile( const wxString& name, const wxString& mimetype );
+    virtual bool SaveFile( const wxString& name ) const;
+    virtual bool SaveFile( const wxString& name, int type ) const;
+    virtual bool SaveFile( const wxString& name, const wxString& mimetype ) const;

 
 #if wxUSE_STREAMS
 
 #if wxUSE_STREAMS

-  virtual bool SaveFile( wxOutputStream& stream, int type );
-  virtual bool SaveFile( wxOutputStream& stream, const wxString& mimetype );
+    virtual bool SaveFile( wxOutputStream& stream, int type ) const;
+    virtual bool SaveFile( wxOutputStream& stream, const wxString& mimetype ) const;

 #endif
 
 #endif
 

-  bool Ok() const;
-  int GetWidth() const;
-  int GetHeight() const;
-
-  char unsigned *GetData() const;
-  void SetData( char unsigned *data );
-
-  void SetMaskColour( unsigned char r, unsigned char g, unsigned char b );
-  unsigned char GetMaskRed() const;
-  unsigned char GetMaskGreen() const;
-  unsigned char GetMaskBlue() const;
-  void SetMask( bool mask = TRUE );
-  bool HasMask() const;
-
-  wxImage& operator = (const wxImage& image)
-  {
-    if ( (*this) != image )
-      Ref(image);
-    return *this;
-  }
-
-  bool operator == (const wxImage& image)
-    { return m_refData == image.m_refData; }
-  bool operator != (const wxImage& image)
-    { return m_refData != image.m_refData; }
-
-  static wxList& GetHandlers() { return sm_handlers; }
-  static void AddHandler( wxImageHandler *handler );
-  static void InsertHandler( wxImageHandler *handler );
-  static bool RemoveHandler( const wxString& name );
-  static wxImageHandler *FindHandler( const wxString& name );
-  static wxImageHandler *FindHandler( const wxString& extension, long imageType );
-  static wxImageHandler *FindHandler( long imageType );
-  static wxImageHandler *FindHandlerMime( const wxString& mimetype );
-
-  static void CleanUpHandlers();
-  static void InitStandardHandlers();
+    bool Ok() const;
+    int GetWidth() const;
+    int GetHeight() const;
+
+    // these functions provide fastest access to wxImage data but should be
+    // used carefully as no checks are done
+    unsigned char *GetData() const;
+    void SetData( unsigned char *data );
+    void SetData( unsigned char *data, int new_width, int new_height );
+
+    unsigned char *GetAlpha() const;    // may return NULL!
+    bool HasAlpha() const { return GetAlpha() != NULL; }
+    void SetAlpha(unsigned char *alpha = NULL);
+
+    // Mask functions
+    void SetMaskColour( unsigned char r, unsigned char g, unsigned char b );
+    unsigned char GetMaskRed() const;
+    unsigned char GetMaskGreen() const;
+    unsigned char GetMaskBlue() const;
+    void SetMask( bool mask = TRUE );
+    bool HasMask() const;
+
+#if wxUSE_PALETTE
+    // Palette functions
+    bool HasPalette() const;
+    const wxPalette& GetPalette() const;
+    void SetPalette(const wxPalette& palette);
+#endif // wxUSE_PALETTE
+
+    // Option functions (arbitrary name/value mapping)
+    void SetOption(const wxString& name, const wxString& value);
+    void SetOption(const wxString& name, int value);
+    wxString GetOption(const wxString& name) const;
+    int GetOptionInt(const wxString& name) const;
+    bool HasOption(const wxString& name) const;
+
+    unsigned long CountColours( unsigned long stopafter = (unsigned long) -1 ) const;
+
+    // Computes the histogram of the image and fills a hash table, indexed
+    // with integer keys built as 0xRRGGBB, containing wxImageHistogramEntry
+    // objects. Each of them contains an 'index' (useful to build a palette
+    // with the image colours) and a 'value', which is the number of pixels
+    // in the image with that colour.
+    // Returned value: # of entries in the histogram
+    unsigned long ComputeHistogram( wxImageHistogram &h ) const;
+
+    wxImage& operator = (const wxImage& image)
+    {
+        if ( (*this) != image )
+            Ref(image);
+        return *this;
+    }
+
+    bool operator == (const wxImage& image) const
+        { return m_refData == image.m_refData; }
+    bool operator != (const wxImage& image) const
+        { return m_refData != image.m_refData; }
+
+    static wxList& GetHandlers() { return sm_handlers; }
+    static void AddHandler( wxImageHandler *handler );
+    static void InsertHandler( wxImageHandler *handler );
+    static bool RemoveHandler( const wxString& name );
+    static wxImageHandler *FindHandler( const wxString& name );
+    static wxImageHandler *FindHandler( const wxString& extension, long imageType );
+    static wxImageHandler *FindHandler( long imageType );
+    static wxImageHandler *FindHandlerMime( const wxString& mimetype );
+
+    static wxString GetImageExtWildcard();
+
+    static void CleanUpHandlers();
+    static void InitStandardHandlers();

 
 protected:
 
 protected:

+    static wxList   sm_handlers;

 
 

-  static wxList sm_handlers;
+private:
+    friend class WXDLLEXPORT wxImageHandler;

 
 

+    DECLARE_DYNAMIC_CLASS(wxImage)

 };
 
 };
 

+

 extern void WXDLLEXPORT wxInitAllImageHandlers();
 
 extern void WXDLLEXPORT wxInitAllImageHandlers();
 

+WXDLLEXPORT_DATA(extern wxImage)    wxNullImage;
+
+//-----------------------------------------------------------------------------
+// wxImage handlers
+//-----------------------------------------------------------------------------
+
+#include "wx/imagbmp.h"
+#include "wx/imagpng.h"
+#include "wx/imaggif.h"
+#include "wx/imagpcx.h"
+#include "wx/imagjpeg.h"
+#include "wx/imagtiff.h"
+#include "wx/imagpnm.h"
+#include "wx/imagxpm.h"
+#include "wx/imagiff.h"
+
+#endif // wxUSE_IMAGE
+

 #endif
   // _WX_IMAGE_H_
 
 #endif
   // _WX_IMAGE_H_