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wxWidgets/include/wx/image.h
Julian Smart 198c264dbc Applied part of #10034: wxImage::ConvertToDisabled() 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62099 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2009-09-24 20:05:33 +00:00

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/////////////////////////////////////////////////////////////////////////////
// Name: wx/image.h
// Purpose: wxImage class
// Author: Robert Roebling
// RCS-ID: $Id$
// Copyright: (c) Robert Roebling
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_IMAGE_H_
#define _WX_IMAGE_H_
#include "wx/defs.h"
#if wxUSE_IMAGE
#include "wx/object.h"
#include "wx/string.h"
#include "wx/gdicmn.h"
#include "wx/hashmap.h"
#include "wx/arrstr.h"
#if wxUSE_STREAMS
# include "wx/stream.h"
#endif
// 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(wxT("quality"))
#define wxIMAGE_OPTION_FILENAME wxString(wxT("FileName"))
#define wxIMAGE_OPTION_RESOLUTION wxString(wxT("Resolution"))
#define wxIMAGE_OPTION_RESOLUTIONX wxString(wxT("ResolutionX"))
#define wxIMAGE_OPTION_RESOLUTIONY wxString(wxT("ResolutionY"))
#define wxIMAGE_OPTION_RESOLUTIONUNIT wxString(wxT("ResolutionUnit"))
#define wxIMAGE_OPTION_MAX_WIDTH wxString(wxT("MaxWidth"))
#define wxIMAGE_OPTION_MAX_HEIGHT wxString(wxT("MaxHeight"))
// constants used with wxIMAGE_OPTION_RESOLUTIONUNIT
//
// NB: don't change these values, they correspond to libjpeg constants
enum wxImageResolution
{
// Resolution not specified
wxIMAGE_RESOLUTION_NONE = 0,
// Resolution specified in inches
wxIMAGE_RESOLUTION_INCHES = 1,
// Resolution specified in centimeters
wxIMAGE_RESOLUTION_CM = 2
};
// Constants for wxImage::Scale() for determining the level of quality
enum wxImageResizeQuality
{
// different image resizing algorithms used by Scale() and Rescale()
wxIMAGE_QUALITY_NEAREST = 0,
wxIMAGE_QUALITY_BILINEAR = 1,
wxIMAGE_QUALITY_BICUBIC = 2,
// default quality is low (but fast)
wxIMAGE_QUALITY_NORMAL = wxIMAGE_QUALITY_NEAREST,
// highest (but best) quality
wxIMAGE_QUALITY_HIGH = wxIMAGE_QUALITY_BICUBIC
};
// 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
//-----------------------------------------------------------------------------
class WXDLLIMPEXP_FWD_CORE wxImageHandler;
class WXDLLIMPEXP_FWD_CORE wxImage;
class WXDLLIMPEXP_FWD_CORE wxPalette;
//-----------------------------------------------------------------------------
// wxVariant support
//-----------------------------------------------------------------------------
#if wxUSE_VARIANT
#include "wx/variant.h"
DECLARE_VARIANT_OBJECT_EXPORTED(wxImage,WXDLLIMPEXP_CORE)
#endif
//-----------------------------------------------------------------------------
// wxImageHandler
//-----------------------------------------------------------------------------
class WXDLLIMPEXP_CORE wxImageHandler: public wxObject
{
public:
wxImageHandler()
: m_name(wxEmptyString), m_extension(wxEmptyString), m_mime(), m_type(wxBITMAP_TYPE_INVALID)
{ }
#if wxUSE_STREAMS
// NOTE: LoadFile and SaveFile are not pure virtuals to allow derived classes
// to implement only one of the two
virtual bool LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream),
bool WXUNUSED(verbose)=true, int WXUNUSED(index)=-1 )
{ return false; }
virtual bool SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream),
bool WXUNUSED(verbose)=true )
{ return false; }
int GetImageCount( wxInputStream& stream );
// save the stream position, call DoGetImageCount() and restore the position
bool CanRead( wxInputStream& stream ) { return CallDoCanRead(stream); }
bool CanRead( const wxString& name );
#endif // wxUSE_STREAMS
void SetName(const wxString& name) { m_name = name; }
void SetExtension(const wxString& ext) { m_extension = ext; }
void SetAltExtensions(const wxArrayString& exts) { m_altExtensions = exts; }
void SetType(wxBitmapType type) { m_type = type; }
void SetMimeType(const wxString& type) { m_mime = type; }
const wxString& GetName() const { return m_name; }
const wxString& GetExtension() const { return m_extension; }
const wxArrayString& GetAltExtensions() const { return m_altExtensions; }
wxBitmapType GetType() const { return m_type; }
const wxString& GetMimeType() const { return m_mime; }
#if WXWIN_COMPATIBILITY_2_8
wxDEPRECATED(
void SetType(long type) { SetType((wxBitmapType)type); }
)
#endif // WXWIN_COMPATIBILITY_2_8
protected:
#if wxUSE_STREAMS
// NOTE: this function is allowed to change the current stream position
// since GetImageCount() will take care of restoring it later
virtual int DoGetImageCount( wxInputStream& WXUNUSED(stream) )
{ return 1; } // default return value is 1 image
// NOTE: this function is allowed to change the current stream position
// since CallDoCanRead() will take care of restoring it later
virtual bool DoCanRead( wxInputStream& stream ) = 0;
// save the stream position, call DoCanRead() and restore the position
bool CallDoCanRead(wxInputStream& stream);
#endif // wxUSE_STREAMS
// helper for the derived classes SaveFile() implementations: returns the
// values of x- and y-resolution options specified as the image options if
// any
static wxImageResolution
GetResolutionFromOptions(const wxImage& image, int *x, int *y);
wxString m_name;
wxString m_extension;
wxArrayString m_altExtensions;
wxString m_mime;
wxBitmapType m_type;
private:
DECLARE_CLASS(wxImageHandler)
};
//-----------------------------------------------------------------------------
// wxImageHistogram
//-----------------------------------------------------------------------------
class WXDLLIMPEXP_CORE wxImageHistogramEntry
{
public:
wxImageHistogramEntry() { index = value = 0; }
unsigned long index;
unsigned long value;
};
WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
wxIntegerHash, wxIntegerEqual,
wxImageHistogramBase);
class WXDLLIMPEXP_CORE wxImageHistogram : public wxImageHistogramBase
{
public:
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;
};
//-----------------------------------------------------------------------------
// wxImage
//-----------------------------------------------------------------------------
class WXDLLIMPEXP_CORE 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 )
{ Create( width, height, clear ); }
wxImage( int width, int height, unsigned char* data, bool static_data = false )
{ Create( width, height, data, static_data ); }
wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data = false )
{ Create( width, height, data, alpha, static_data ); }
// ctor variants using wxSize:
wxImage( const wxSize& sz, bool clear = true )
{ Create( sz, clear ); }
wxImage( const wxSize& sz, unsigned char* data, bool static_data = false )
{ Create( sz, data, static_data ); }
wxImage( const wxSize& sz, unsigned char* data, unsigned char* alpha, bool static_data = false )
{ Create( sz, data, alpha, static_data ); }
wxImage( const wxString& name, wxBitmapType type = wxBITMAP_TYPE_ANY, int index = -1 )
{ LoadFile( name, type, index ); }
wxImage( const wxString& name, const wxString& mimetype, int index = -1 )
{ LoadFile( name, mimetype, index ); }
wxImage( const char* const* xpmData )
{ Create(xpmData); }
#if wxUSE_STREAMS
wxImage( wxInputStream& stream, wxBitmapType type = wxBITMAP_TYPE_ANY, int index = -1 )
{ LoadFile( stream, type, index ); }
wxImage( wxInputStream& stream, const wxString& mimetype, int index = -1 )
{ LoadFile( stream, mimetype, index ); }
#endif // wxUSE_STREAMS
bool Create( const char* const* xpmData );
#ifdef __BORLANDC__
// needed for Borland 5.5
wxImage( char** xpmData ) { Create(const_cast<const char* const*>(xpmData)); }
bool Create( char** xpmData ) { return Create(const_cast<const char* const*>(xpmData)); }
#endif
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 );
// Create() variants using wxSize:
bool Create( const wxSize& sz, bool clear = true )
{ return Create(sz.GetWidth(), sz.GetHeight(), clear); }
bool Create( const wxSize& sz, unsigned char* data, bool static_data = false )
{ return Create(sz.GetWidth(), sz.GetHeight(), data, static_data); }
bool Create( const wxSize& sz, unsigned char* data, unsigned char* alpha, bool static_data = false )
{ return Create(sz.GetWidth(), sz.GetHeight(), data, alpha, static_data); }
void Destroy();
// initialize the image data with zeroes
void Clear(unsigned char value = 0);
// creates an identical copy of the image (the = operator
// just raises the ref count)
wxImage Copy() const;
// return the new image with size width*height
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
wxImage Scale( int width, int height,
wxImageResizeQuality quality = wxIMAGE_QUALITY_NORMAL ) const;
// box averager and bicubic filters for up/down sampling
wxImage ResampleNearest(int width, int height) const;
wxImage ResampleBox(int width, int height) const;
wxImage ResampleBilinear(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) const;
wxImage BlurHorizontal(int radius) const;
wxImage BlurVertical(int radius) const;
wxImage ShrinkBy( int xFactor , int yFactor ) const ;
// rescales the image in place
wxImage& Rescale( int width, int height,
wxImageResizeQuality 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.
wxImage Rotate(double angle, const wxPoint & centre_of_rotation,
bool interpolating = true, wxPoint * offset_after_rotation = NULL) const;
wxImage Rotate90( bool clockwise = true ) const;
wxImage Mirror( bool horizontally = true ) 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 );
// Convert to greyscale image. Uses the luminance component (Y) of the image.
// The luma value (YUV) is calculated using (R * weight_r) + (G * weight_g) + (B * weight_b), defaults to ITU-T BT.601
wxImage ConvertToGreyscale(double weight_r, double weight_g, double weight_b) const;
wxImage ConvertToGreyscale(void) 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;
// Convert to disabled (dimmed) image.
wxImage ConvertToDisabled(unsigned char brightness = 255) 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;
void SetAlpha(int x, int y, unsigned char alpha);
unsigned char GetAlpha(int x, int y) const;
// 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);
// converts image's alpha channel to mask (choosing mask colour
// automatically or using the specified colour for the mask), if it has
// any, does nothing otherwise:
bool ConvertAlphaToMask(unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD);
void ConvertAlphaToMask(unsigned char mr, unsigned char mg, unsigned char mb,
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, wxBitmapType type = wxBITMAP_TYPE_ANY );
virtual bool LoadFile( const wxString& name, wxBitmapType type = wxBITMAP_TYPE_ANY, int index = -1 );
virtual bool LoadFile( const wxString& name, const wxString& mimetype, int index = -1 );
#if wxUSE_STREAMS
static bool CanRead( wxInputStream& stream );
static int GetImageCount( wxInputStream& stream, wxBitmapType type = wxBITMAP_TYPE_ANY );
virtual bool LoadFile( wxInputStream& stream, wxBitmapType type = wxBITMAP_TYPE_ANY, int index = -1 );
virtual bool LoadFile( wxInputStream& stream, const wxString& mimetype, int index = -1 );
#endif
virtual bool SaveFile( const wxString& name ) const;
virtual bool SaveFile( const wxString& name, wxBitmapType type ) const;
virtual bool SaveFile( const wxString& name, const wxString& mimetype ) const;
#if wxUSE_STREAMS
virtual bool SaveFile( wxOutputStream& stream, wxBitmapType type ) const;
virtual bool SaveFile( wxOutputStream& stream, const wxString& mimetype ) const;
#endif
bool Ok() const { return IsOk(); }
bool IsOk() const;
int GetWidth() const;
int GetHeight() const;
wxSize GetSize() const
{ return wxSize(GetWidth(), GetHeight()); }
// Gets the type of image found by LoadFile or specified with SaveFile
wxBitmapType GetType() const;
// Set the image type, this is normally only called if the image is being
// created from data in the given format but not using LoadFile() (e.g.
// wxGIFDecoder uses this)
void SetType(wxBitmapType type);
// 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, 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; }
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 );
// 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;
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;
// 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);
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, wxBitmapType imageType );
static wxImageHandler *FindHandler( wxBitmapType imageType );
static wxImageHandler *FindHandlerMime( const wxString& mimetype );
static wxString GetImageExtWildcard();
static void CleanUpHandlers();
static void InitStandardHandlers();
static HSVValue RGBtoHSV(const RGBValue& rgb);
static RGBValue HSVtoRGB(const HSVValue& hsv);
#if WXWIN_COMPATIBILITY_2_8
wxDEPRECATED_CONSTRUCTOR(
wxImage(const wxString& name, long type, int index = -1)
{
LoadFile(name, (wxBitmapType)type, index);
}
)
#if wxUSE_STREAMS
wxDEPRECATED_CONSTRUCTOR(
wxImage(wxInputStream& stream, long type, int index = -1)
{
LoadFile(stream, (wxBitmapType)type, index);
}
)
wxDEPRECATED(
bool LoadFile(wxInputStream& stream, long type, int index = -1)
{
return LoadFile(stream, (wxBitmapType)type, index);
}
)
wxDEPRECATED(
bool SaveFile(wxOutputStream& stream, long type) const
{
return SaveFile(stream, (wxBitmapType)type);
}
)
#endif // wxUSE_STREAMS
wxDEPRECATED(
bool LoadFile(const wxString& name, long type, int index = -1)
{
return LoadFile(name, (wxBitmapType)type, index);
}
)
wxDEPRECATED(
bool SaveFile(const wxString& name, long type) const
{
return SaveFile(name, (wxBitmapType)type);
}
)
wxDEPRECATED(
static wxImageHandler *FindHandler(const wxString& ext, long type)
{
return FindHandler(ext, (wxBitmapType)type);
}
)
wxDEPRECATED(
static wxImageHandler *FindHandler(long imageType)
{
return FindHandler((wxBitmapType)imageType);
}
)
#endif // WXWIN_COMPATIBILITY_2_8
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 WXDLLIMPEXP_FWD_CORE wxImageHandler;
#if wxUSE_STREAMS
// read the image from the specified stream updating image type if
// successful
bool DoLoad(wxImageHandler& handler, wxInputStream& stream, int index);
// write the image to the specified stream and also update the image type
// if successful
bool DoSave(wxImageHandler& handler, wxOutputStream& stream) const;
#endif // wxUSE_STREAMS
DECLARE_DYNAMIC_CLASS(wxImage)
};
extern void WXDLLIMPEXP_CORE wxInitAllImageHandlers();
extern WXDLLIMPEXP_DATA_CORE(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/imagtga.h"
#include "wx/imagtiff.h"
#include "wx/imagpnm.h"
#include "wx/imagxpm.h"
#include "wx/imagiff.h"
#endif // wxUSE_IMAGE
#endif
// _WX_IMAGE_H_
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