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Public Member Functions | List of all members
wxBitmapHandler Class Reference
Graphics Device Interface (GDI)

`#include <wx/bitmap.h>`

Inheritance diagram for wxBitmapHandler:
[legend]

## Detailed Description

This is the base class for implementing bitmap file loading/saving, and bitmap creation from data.

It is used within wxBitmap and is not normally seen by the application.

If you wish to extend the capabilities of wxBitmap, derive a class from wxBitmapHandler and add the handler using wxBitmap::AddHandler() in your application initialization.

Note that all wxBitmapHandlers provided by wxWidgets are part of the wxCore library. For details about the default handlers, please see the note in the wxBitmap class documentation.

##

Library: wxCore
Category: Graphics Device Interface (GDI)

See Also
  Bitmaps and Icons, wxBitmap, wxIcon, wxCursor

## Public Member Functions

| wxBitmapHandler ()
| Default constructor.
virtual | ~wxBitmapHandler ()
| Destroys the wxBitmapHandler object.
virtual bool | Create (wxBitmap *bitmap, const void *data, wxBitmapType type, int width, int height, int depth=1)
| Creates a bitmap from the given data, which can be of arbitrary type.
const wxString & | GetExtension () const
| Gets the file extension associated with this handler.
const wxString & | GetName () const
| Gets the name of this handler.
wxBitmapType | GetType () const
| Gets the bitmap type associated with this handler.
virtual bool | LoadFile (wxBitmap *bitmap, const wxString &name, wxBitmapType type, int desiredWidth, int desiredHeight)
| Loads a bitmap from a file or resource, putting the resulting data into bitmap.
virtual bool | SaveFile (const wxBitmap *bitmap, const wxString &name, wxBitmapType type, const wxPalette *palette=NULL) const
| Saves a bitmap in the named file.
void | SetExtension (const wxString &extension)
| Sets the handler extension.
void | SetName (const wxString &name)
| Sets the handler name.
void | SetType (wxBitmapType type)
| Sets the handler type.
Public Member Functions inherited from wxObject
| wxObject ()
| Default ctor; initializes to NULL the internal reference data.
| wxObject (const wxObject &other)
| Copy ctor.
virtual | ~wxObject ()
| Destructor.
virtual wxClassInfo * | GetClassInfo () const
| This virtual function is redefined for every class that requires run-time type information, when using the wxDECLARE_CLASS macro (or similar).
wxObjectRefData * | GetRefData () const
| Returns the wxObject::m_refData pointer, i.e. the data referenced by this object.
bool | IsKindOf (const wxClassInfo *info) const
| Determines whether this class is a subclass of (or the same class as) the given class.
bool | IsSameAs (const wxObject &obj) const
| Returns true if this object has the same data pointer as obj.
void | Ref (const wxObject &clone)
| Makes this object refer to the data in clone.
void | SetRefData (wxObjectRefData *data)
| Sets the wxObject::m_refData pointer.
void | UnRef ()
| Decrements the reference count in the associated data, and if it is zero, deletes the data.
void | UnShare ()
| This is the same of AllocExclusive() but this method is public.
void | operator delete (void *buf)
| The delete operator is defined for debugging versions of the library only, when the identifier `WXDEBUG` is defined.
void * | operator new (size_t size, const wxString &filename=NULL, int lineNum=0)
| The new operator is defined for debugging versions of the library only, when the identifier `WXDEBUG` is defined.

## Additional Inherited Members

Protected Member Functions inherited from wxObject
void | AllocExclusive ()
| Ensure that this object's data is not shared with any other object.
virtual wxObjectRefData * | CreateRefData () const
| Creates a new instance of the wxObjectRefData-derived class specific to this object and returns it.
virtual wxObjectRefData * | CloneRefData (const wxObjectRefData *data) const
| Creates a new instance of the wxObjectRefData-derived class specific to this object and initializes it copying data.
Protected Attributes inherited from wxObject
wxObjectRefData * | m_refData
| Pointer to an object which is the object's reference-counted data.

## Constructor & Destructor Documentation

wxBitmapHandler::wxBitmapHandler | ( |  | ) |

Default constructor.

In your own default constructor, initialise the members m_name, m_extension and m_type.

virtual wxBitmapHandler::~wxBitmapHandler | ( |  | ) |

virtual

Destroys the wxBitmapHandler object.

## Member Function Documentation

virtual bool wxBitmapHandler::Create | ( | wxBitmap * | bitmap,
|  | const void * | data,
|  | wxBitmapType | type,
|  | int | width,
|  | int | height,
|  | int | depth = `1`
| ) |  |

virtual

Creates a bitmap from the given data, which can be of arbitrary type.

The wxBitmap object bitmap is manipulated by this function.

Parameters

  bitmap | The wxBitmap object.
  width | The width of the bitmap in pixels.
  height | The height of the bitmap in pixels.
  depth | The depth of the bitmap in pixels. If this is wxBITMAP_SCREEN_DEPTH, the screen depth is used.
  data | Data whose type depends on the value of type.
  type | A bitmap type identifier - see wxBitmapType for a list of possible values.

Returns
  true if the call succeeded, false otherwise (the default).

const wxString& wxBitmapHandler::GetExtension | ( |  | ) | const

Gets the file extension associated with this handler.

const wxString& wxBitmapHandler::GetName | ( |  | ) | const

Gets the name of this handler.

wxBitmapType wxBitmapHandler::GetType | ( |  | ) | const

Gets the bitmap type associated with this handler.

virtual bool wxBitmapHandler::LoadFile | ( | wxBitmap * | bitmap,
|  | const wxString & | name,
|  | wxBitmapType | type,
|  | int | desiredWidth,
|  | int | desiredHeight
| ) |  |

virtual

Loads a bitmap from a file or resource, putting the resulting data into bitmap.

Note
  Under MSW, when loading a bitmap from resources (i.e. using `wxBITMAP_TYPE_BMP_RESOURCE` as type), the light grey colour is considered to be transparent, for historical reasons. If you want to handle the light grey pixels normally instead, call SetMask(NULL) after loading the bitmap.

Parameters

  bitmap | The bitmap object which is to be affected by this operation.
  name | Either a filename or a Windows resource name. The meaning of name is determined by the type parameter.
  type | See wxBitmapType for values this can take.
  desiredWidth | The desired width for the loaded bitmap.
  desiredHeight | The desired height for the loaded bitmap.

Returns
  true if the operation succeeded, false otherwise.

See Also
  wxBitmap::LoadFile, wxBitmap::SaveFile, SaveFile()

virtual bool wxBitmapHandler::SaveFile | ( | const wxBitmap * | bitmap,
|  | const wxString & | name,
|  | wxBitmapType | type,
|  | const wxPalette * | palette = `NULL`
| ) |  | const

virtual

Saves a bitmap in the named file.

Parameters

  bitmap | The bitmap object which is to be affected by this operation.
  name | A filename. The meaning of name is determined by the type parameter.
  type | See wxBitmapType for values this can take.
  palette | An optional palette used for saving the bitmap.

Returns
  true if the operation succeeded, false otherwise.

See Also
  wxBitmap::LoadFile, wxBitmap::SaveFile, LoadFile()

void wxBitmapHandler::SetExtension | ( | const wxString & | extension | ) |

Sets the handler extension.

Parameters

  extension | Handler extension.

void wxBitmapHandler::SetName | ( | const wxString & | name | ) |

Sets the handler name.

Parameters

  name | Handler name.

void wxBitmapHandler::SetType | ( | wxBitmapType | type | ) |

Sets the handler type.

Parameters

  type | Handler type.