apply complete transforms (scroll window PrepareDC was not functioning properly)

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

diff --git a/include/wx/image.h b/include/wx/image.h
index aa3070e60d983306f571c56c7c1f181e1eae0c33..d1d4ec762162e10b674714ffb99036a6dbf6f97e 100644 (file)
--- a/include/wx/image.h
+++ b/include/wx/image.h
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        image.h
+// Name:        wx/image.h

 // Purpose:     wxImage class
 // Author:      Robert Roebling
 // RCS-ID:      $Id$
 // Purpose:     wxImage class
 // Author:      Robert Roebling
 // RCS-ID:      $Id$


@@ -10,11 +10,10 @@
 #ifndef _WX_IMAGE_H_
 #define _WX_IMAGE_H_
 
 #ifndef _WX_IMAGE_H_
 #define _WX_IMAGE_H_
 

-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma interface "image.h"
-#endif
+#include "wx/defs.h"
+
+#if wxUSE_IMAGE

 
 

-#include "wx/setup.h"

 #include "wx/object.h"
 #include "wx/string.h"
 #include "wx/gdicmn.h"
 #include "wx/object.h"
 #include "wx/string.h"
 #include "wx/gdicmn.h"


@@ -24,14 +23,40 @@
 #  include "wx/stream.h"
 #endif
 
 #  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
 
 // 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_QUALITY  wxString(_T("quality"))

 #define wxIMAGE_OPTION_FILENAME wxString(_T("FileName"))
 
 #define wxIMAGE_OPTION_FILENAME wxString(_T("FileName"))
 

+#define wxIMAGE_OPTION_RESOLUTION            wxString(_T("Resolution"))
+#define wxIMAGE_OPTION_RESOLUTIONX           wxString(_T("ResolutionX"))
+#define wxIMAGE_OPTION_RESOLUTIONY           wxString(_T("ResolutionY"))
+
+#define wxIMAGE_OPTION_RESOLUTIONUNIT        wxString(_T("ResolutionUnit"))
+
+// constants used with wxIMAGE_OPTION_RESOLUTIONUNIT
+enum
+{
+    wxIMAGE_RESOLUTION_INCHES = 1,
+    wxIMAGE_RESOLUTION_CM = 2
+};
+
+// Constants for wxImage::Scale() for determining the level of quality
+enum
+{
+    wxIMAGE_QUALITY_NORMAL = 0,
+    wxIMAGE_QUALITY_HIGH = 1
+};
+
+// alpha channel values: fully transparent, default threshold separating
+// transparent pixels from opaque for a few functions dealing with alpha and
+// fully opaque
+const unsigned char wxIMAGE_ALPHA_TRANSPARENT = 0;
+const unsigned char wxIMAGE_ALPHA_THRESHOLD = 0x80;
+const unsigned char wxIMAGE_ALPHA_OPAQUE = 0xff;
+

 //-----------------------------------------------------------------------------
 // classes
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 // classes
 //-----------------------------------------------------------------------------


@@ -40,6 +65,15 @@ class WXDLLEXPORT wxImageHandler;
 class WXDLLEXPORT wxImage;
 class WXDLLEXPORT wxPalette;
 
 class WXDLLEXPORT wxImage;
 class WXDLLEXPORT wxPalette;
 

+//-----------------------------------------------------------------------------
+// wxVariant support
+//-----------------------------------------------------------------------------
+
+#if wxUSE_VARIANT
+#include "wx/variant.h"
+DECLARE_VARIANT_OBJECT_EXPORTED(wxImage,WXDLLEXPORT)
+#endif
+

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


@@ -65,10 +99,10 @@ public:
     void SetExtension(const wxString& ext) { m_extension = ext; }
     void SetType(long type) { m_type = type; }
     void SetMimeType(const wxString& type) { m_mime = type; }
     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; }
+    const wxString& GetName() const { return m_name; }
+    const wxString& GetExtension() const { return m_extension; }

     long GetType() const { return m_type; }
     long GetType() const { return m_type; }

-    wxString GetMimeType() const { return m_mime; }
+    const wxString& GetMimeType() const { return m_mime; }

 
 protected:
 #if wxUSE_STREAMS
 
 protected:
 #if wxUSE_STREAMS


@@ -136,22 +170,46 @@ public:
 class WXDLLEXPORT wxImage: public wxObject
 {
 public:
 class WXDLLEXPORT wxImage: public wxObject
 {
 public:

+    // red, green and blue are 8 bit unsigned integers in the range of 0..255
+    // We use the identifier RGBValue instead of RGB, since RGB is #defined
+    class RGBValue
+    {
+    public:
+      RGBValue(unsigned char r=0, unsigned char g=0, unsigned char b=0)
+        : red(r), green(g), blue(b) {}
+        unsigned char red;
+        unsigned char green;
+        unsigned char blue;
+    };
+
+    // hue, saturation and value are doubles in the range 0.0..1.0
+    class HSVValue
+    {
+    public:
+        HSVValue(double h=0.0, double s=0.0, double v=0.0)
+            : hue(h), saturation(s), value(v) {}
+        double hue;
+        double saturation;
+        double value;
+    };
+

     wxImage(){}
     wxImage( int width, int height, bool clear = true );
     wxImage( int width, int height, unsigned char* data, bool static_data = false );
     wxImage(){}
     wxImage( int width, int height, bool clear = true );
     wxImage( int width, int height, unsigned char* data, bool static_data = false );

+    wxImage( int width, int height, unsigned char* data, unsigned char* alpha, 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 );
     wxImage( const wxString& name, long type = wxBITMAP_TYPE_ANY, int index = -1 );
     wxImage( const wxString& name, const wxString& mimetype, int index = -1 );

+    wxImage( const char* const* xpmData );

 
 #if wxUSE_STREAMS
     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_STREAMS
     wxImage( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY, int index = -1 );
     wxImage( wxInputStream& stream, const wxString& mimetype, int index = -1 );
 #endif // wxUSE_STREAMS
 

-    wxImage( const wxImage& image );
-    wxImage( const wxImage* image );
-

     bool Create( int width, int height, bool clear = true );
     bool Create( int width, int height, unsigned char* data, bool static_data = false );
     bool Create( int width, int height, bool clear = true );
     bool Create( int width, int height, unsigned char* data, bool static_data = false );

+    bool Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data = false );
+    bool Create( const char* const* xpmData );

     void Destroy();
 
     // creates an identical copy of the image (the = operator
     void Destroy();
 
     // creates an identical copy of the image (the = operator


@@ -159,19 +217,39 @@ public:
     wxImage Copy() const;
 
     // return the new image with size width*height
     wxImage Copy() const;
 
     // return the new image with size width*height

-    wxImage GetSubImage( const wxRect& ) const;
+    wxImage GetSubImage( const wxRect& rect) const;
+
+    // Paste the image or part of this image into an image of the given size at the pos
+    //  any newly exposed areas will be filled with the rgb colour
+    //  by default if r = g = b = -1 then fill with this image's mask colour or find and
+    //  set a suitable mask colour
+    wxImage Size( const wxSize& size, const wxPoint& pos,
+                  int r = -1, int g = -1, int b = -1 ) const;

 
     // 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 );
 
     // return the new image with size width*height
 
     // 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 );
 
     // return the new image with size width*height

-    wxImage Scale( int width, int height ) const;
+    wxImage Scale( int width, int height, int quality = wxIMAGE_QUALITY_NORMAL ) const;
+
+    // box averager and bicubic filters for up/down sampling
+    wxImage ResampleBox(int width, int height) const;
+    wxImage ResampleBicubic(int width, int height) const;
+
+    // blur the image according to the specified pixel radius
+    wxImage Blur(int radius);
+    wxImage BlurHorizontal(int radius);
+    wxImage BlurVertical(int radius);

 
     wxImage ShrinkBy( int xFactor , int yFactor ) const ;
 
     // rescales the image in place
 
     wxImage ShrinkBy( int xFactor , int yFactor ) const ;
 
     // rescales the image in place

-    wxImage& Rescale( int width, int height ) { return *this = Scale(width, height); }
+    wxImage& Rescale( int width, int height, int quality = wxIMAGE_QUALITY_NORMAL ) { return *this = Scale(width, height, quality); }
+
+    // resizes the image in place
+    wxImage& Resize( const wxSize& size, const wxPoint& pos,
+                     int r = -1, int g = -1, int b = -1 ) { return *this = Size(size, pos, r, g, b); }

 
     // Rotates the image about the given point, 'angle' radians.
     // Returns the rotated image, leaving this image intact.
 
     // Rotates the image about the given point, 'angle' radians.
     // Returns the rotated image, leaving this image intact.


@@ -185,12 +263,17 @@ public:
     void Replace( unsigned char r1, unsigned char g1, unsigned char b1,
                   unsigned char r2, unsigned char g2, unsigned char b2 );
 
     void Replace( unsigned char r1, unsigned char g1, unsigned char b1,
                   unsigned char r2, unsigned char g2, unsigned char b2 );
 

+    // Convert to greyscale image. Uses the luminance component (Y) of the image.
+    // The luma value (YUV) is calculated using (R * lr) + (G * lg) + (B * lb), defaults to ITU-T BT.601
+    wxImage ConvertToGreyscale( double lr = 0.299, double lg = 0.587, double lb = 0.114 ) const;
+

     // 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;
 
     // these routines are slow but safe
     void SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b );
     // 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;
 
     // these routines are slow but safe
     void SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b );

+    void SetRGB( const wxRect& rect, 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;
     unsigned char GetRed( int x, int y ) const;
     unsigned char GetGreen( int x, int y ) const;
     unsigned char GetBlue( int x, int y ) const;


@@ -209,7 +292,19 @@ public:
 
     // converts image's alpha channel to mask, if it has any, does nothing
     // otherwise:
 
     // converts image's alpha channel to mask, if it has any, does nothing
     // otherwise:

-    bool ConvertAlphaToMask(unsigned char threshold = 128);
+    bool ConvertAlphaToMask(unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD);
+
+    // This method converts an image where the original alpha
+    // information is only available as a shades of a colour
+    // (actually shades of grey) typically when you draw anti-
+    // aliased text into a bitmap. The DC drawinf routines
+    // draw grey values on the black background although they
+    // actually mean to draw white with differnt alpha values.
+    // This method reverses it, assuming a black (!) background
+    // and white text (actually only the red channel is read).
+    // The method will then fill up the whole image with the
+    // colour given.
+    bool ConvertColourToAlpha( unsigned char r, unsigned char g, unsigned char b );

 
     static bool CanRead( const wxString& name );
     static int GetImageCount( const wxString& name, long type = wxBITMAP_TYPE_ANY );
 
     static bool CanRead( const wxString& name );
     static int GetImageCount( const wxString& name, long type = wxBITMAP_TYPE_ANY );


@@ -232,22 +327,32 @@ public:
     virtual bool SaveFile( wxOutputStream& stream, const wxString& mimetype ) const;
 #endif
 
     virtual bool SaveFile( wxOutputStream& stream, const wxString& mimetype ) const;
 #endif
 

-    bool Ok() const;
+    bool Ok() const { return IsOk(); }
+    bool IsOk() 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;
     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 );
+    void SetData( unsigned char *data, bool static_data=false );
+    void SetData( unsigned char *data, int new_width, int new_height, bool static_data=false );

 
     unsigned char *GetAlpha() const;    // may return NULL!
     bool HasAlpha() const { return GetAlpha() != NULL; }
 
     unsigned char *GetAlpha() const;    // may return NULL!
     bool HasAlpha() const { return GetAlpha() != NULL; }

-    void SetAlpha(unsigned char *alpha = NULL);
+    void SetAlpha(unsigned char *alpha = NULL, bool static_data=false);
+    void InitAlpha();
+
+    // return true if this pixel is masked or has alpha less than specified
+    // threshold
+    bool IsTransparent(int x, int y,
+                       unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD) const;

 
     // Mask functions
     void SetMaskColour( unsigned char r, unsigned char g, unsigned char b );
 
     // Mask functions
     void SetMaskColour( unsigned char r, unsigned char g, unsigned char b );

+    // Get the current mask colour or find a suitable colour
+    // returns true if using current mask colour
+    bool GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const;

     unsigned char GetMaskRed() const;
     unsigned char GetMaskGreen() const;
     unsigned char GetMaskBlue() const;
     unsigned char GetMaskRed() const;
     unsigned char GetMaskGreen() const;
     unsigned char GetMaskBlue() const;


@@ -278,12 +383,9 @@ public:
     // Returned value: # of entries in the histogram
     unsigned long ComputeHistogram( wxImageHistogram &h ) const;
 
     // 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;
-    }
+    // Rotates the hue of each pixel of the image. angle is a double in the range
+    // -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
+    void RotateHue(double angle);

 
     bool operator == (const wxImage& image) const
         { return m_refData == image.m_refData; }
 
     bool operator == (const wxImage& image) const
         { return m_refData == image.m_refData; }


@@ -304,9 +406,22 @@ public:
     static void CleanUpHandlers();
     static void InitStandardHandlers();
 
     static void CleanUpHandlers();
     static void InitStandardHandlers();
 

+    static HSVValue RGBtoHSV(const RGBValue& rgb);
+    static RGBValue HSVtoRGB(const HSVValue& hsv);
+
+

 protected:
     static wxList   sm_handlers;
 
 protected:
     static wxList   sm_handlers;
 

+    // return the index of the point with the given coordinates or -1 if the
+    // image is invalid of the coordinates are out of range
+    //
+    // note that index must be multiplied by 3 when using it with RGB array
+    long XYToIndex(int x, int y) const;
+
+    virtual wxObjectRefData* CreateRefData() const;
+    virtual wxObjectRefData* CloneRefData(const wxObjectRefData* data) const;
+

 private:
     friend class WXDLLEXPORT wxImageHandler;
 
 private:
     friend class WXDLLEXPORT wxImageHandler;
 


@@ -316,7 +431,7 @@ private:
 
 extern void WXDLLEXPORT wxInitAllImageHandlers();
 
 
 extern void WXDLLEXPORT wxInitAllImageHandlers();
 

-WXDLLEXPORT_DATA(extern wxImage)    wxNullImage;
+extern WXDLLEXPORT_DATA(wxImage)    wxNullImage;

 
 //-----------------------------------------------------------------------------
 // wxImage handlers
 
 //-----------------------------------------------------------------------------
 // wxImage handlers


@@ -336,4 +451,3 @@ WXDLLEXPORT_DATA(extern wxImage)    wxNullImage;
 
 #endif
   // _WX_IMAGE_H_
 
 #endif
   // _WX_IMAGE_H_

-