852 lines
27 KiB
Objective-C
852 lines
27 KiB
Objective-C
/////////////////////////////////////////////////////////////////////////////
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// Name: bitmap.h
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// Purpose: interface of wxBitmap* classes
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// Author: wxWidgets team
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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/**
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In wxBitmap and wxBitmapHandler context this value means: "use the screen depth".
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*/
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#define wxBITMAP_SCREEN_DEPTH (-1)
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/**
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@class wxBitmapHandler
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This is the base class for implementing bitmap file loading/saving, and
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bitmap creation from data.
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It is used within wxBitmap and is not normally seen by the application.
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If you wish to extend the capabilities of wxBitmap, derive a class from
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wxBitmapHandler and add the handler using wxBitmap::AddHandler() in your
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application initialization.
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Note that all wxBitmapHandlers provided by wxWidgets are part of the
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@ref page_libs_wxcore library.
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For details about the default handlers, please see the note in the
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wxBitmap class documentation.
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@library{wxcore}
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@category{gdi}
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@see @ref overview_bitmap, wxBitmap, wxIcon, wxCursor
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*/
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class wxBitmapHandler : public wxObject
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{
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public:
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/**
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Default constructor.
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In your own default constructor, initialise the members m_name,
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m_extension and m_type.
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*/
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wxBitmapHandler();
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/**
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Destroys the wxBitmapHandler object.
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*/
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virtual ~wxBitmapHandler();
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/**
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Creates a bitmap from the given data, which can be of arbitrary type.
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The wxBitmap object @a bitmap is manipulated by this function.
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@param bitmap
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The wxBitmap object.
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@param width
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The width of the bitmap in pixels.
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@param height
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The height of the bitmap in pixels.
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@param depth
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The depth of the bitmap in pixels.
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If this is ::wxBITMAP_SCREEN_DEPTH, the screen depth is used.
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@param data
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Data whose type depends on the value of type.
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@param type
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A bitmap type identifier - see ::wxBitmapType for a list
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of possible values.
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@return @true if the call succeeded, @false otherwise (the default).
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*/
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virtual bool Create(wxBitmap* bitmap, const void* data, wxBitmapType type,
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int width, int height, int depth = 1);
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/**
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Gets the file extension associated with this handler.
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*/
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const wxString& GetExtension() const;
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/**
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Gets the name of this handler.
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*/
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const wxString& GetName() const;
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/**
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Gets the bitmap type associated with this handler.
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*/
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wxBitmapType GetType() const;
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/**
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Loads a bitmap from a file or resource, putting the resulting data into
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@a bitmap.
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@note Under MSW, when loading a bitmap from resources (i.e. using @c
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wxBITMAP_TYPE_BMP_RESOURCE as @a type), the light grey colour is
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considered to be transparent, for historical reasons. If you want
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to handle the light grey pixels normally instead, call
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SetMask(NULL) after loading the bitmap.
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@param bitmap
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The bitmap object which is to be affected by this operation.
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@param name
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Either a filename or a Windows resource name.
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The meaning of name is determined by the type parameter.
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@param type
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See ::wxBitmapType for values this can take.
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@param desiredWidth
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The desired width for the loaded bitmap.
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@param desiredHeight
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The desired height for the loaded bitmap.
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@return @true if the operation succeeded, @false otherwise.
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@see wxBitmap::LoadFile, wxBitmap::SaveFile, SaveFile()
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*/
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virtual bool LoadFile(wxBitmap* bitmap, const wxString& name, wxBitmapType type,
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int desiredWidth, int desiredHeight);
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/**
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Saves a bitmap in the named file.
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@param bitmap
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The bitmap object which is to be affected by this operation.
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@param name
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A filename. The meaning of name is determined by the type parameter.
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@param type
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See ::wxBitmapType for values this can take.
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@param palette
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An optional palette used for saving the bitmap.
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@return @true if the operation succeeded, @false otherwise.
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@see wxBitmap::LoadFile, wxBitmap::SaveFile, LoadFile()
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*/
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virtual bool SaveFile(const wxBitmap* bitmap, const wxString& name, wxBitmapType type,
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const wxPalette* palette = NULL) const;
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/**
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Sets the handler extension.
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@param extension
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Handler extension.
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*/
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void SetExtension(const wxString& extension);
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/**
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Sets the handler name.
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@param name
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Handler name.
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*/
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void SetName(const wxString& name);
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/**
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Sets the handler type.
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@param type
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Handler type.
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*/
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void SetType(wxBitmapType type);
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};
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/**
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@class wxBitmap
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This class encapsulates the concept of a platform-dependent bitmap,
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either monochrome or colour or colour with alpha channel support.
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If you need direct access the bitmap data instead going through
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drawing to it using wxMemoryDC you need to use the wxPixelData
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class (either wxNativePixelData for RGB bitmaps or wxAlphaPixelData
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for bitmaps with an additionally alpha channel).
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Note that many wxBitmap functions take a @e type parameter, which is a
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value of the ::wxBitmapType enumeration.
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The validity of those values depends however on the platform where your program
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is running and from the wxWidgets configuration.
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If all possible wxWidgets settings are used:
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- wxMSW supports BMP and ICO files, BMP and ICO resources;
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- wxGTK supports any file supported by gdk-pixbuf;
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- wxMac supports PICT resources;
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- wxX11 supports XPM files, XPM data, XBM data;
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In addition, wxBitmap can load and save all formats that wxImage can; see wxImage
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for more info. Of course, you must have loaded the wxImage handlers
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(see ::wxInitAllImageHandlers() and wxImage::AddHandler).
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Note that all available wxBitmapHandlers for a given wxWidgets port are
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automatically loaded at startup so you won't need to use wxBitmap::AddHandler.
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More on the difference between wxImage and wxBitmap: wxImage is just a
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buffer of RGB bytes with an optional buffer for the alpha bytes. It is all
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generic, platform independent and image file format independent code. It
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includes generic code for scaling, resizing, clipping, and other manipulations
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of the image data. OTOH, wxBitmap is intended to be a wrapper of whatever is
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the native image format that is quickest/easiest to draw to a DC or to be the
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target of the drawing operations performed on a wxMemoryDC. By splitting the
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responsibilities between wxImage/wxBitmap like this then it's easier to use
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generic code shared by all platforms and image types for generic operations and
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platform specific code where performance or compatibility is needed.
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@library{wxcore}
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@category{gdi}
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@stdobjects
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::wxNullBitmap
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@see @ref overview_bitmap, @ref overview_bitmap_supportedformats,
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wxDC::Blit, wxIcon, wxCursor, wxMemoryDC, wxImage, wxPixelData
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*/
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class wxBitmap : public wxGDIObject
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{
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public:
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/**
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Default constructor.
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Constructs a bitmap object with no data; an assignment or another member
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function such as Create() or LoadFile() must be called subsequently.
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*/
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wxBitmap();
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/**
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Copy constructor, uses @ref overview_refcount "reference counting".
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To make a real copy, you can use:
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@code
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wxBitmap newBitmap = oldBitmap.GetSubBitmap(
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wxRect(0, 0, oldBitmap.GetWidth(), oldBitmap.GetHeight()));
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@endcode
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*/
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wxBitmap(const wxBitmap& bitmap);
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/*
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Creates a bitmap from the given @a data which is interpreted in
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platform-dependent manner.
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@param data
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Specifies the bitmap data in a platform-dependent format.
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@param type
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May be one of the ::wxBitmapType values and indicates which type of
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bitmap does @a data contains. See the note in the class
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detailed description.
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@param width
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Specifies the width of the bitmap.
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@param height
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Specifies the height of the bitmap.
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@param depth
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Specifies the depth of the bitmap.
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If this is omitted, the display depth of the screen is used.
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wxBitmap(const void* data, int type, int width, int height, int depth = -1);
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NOTE: this ctor is not implemented by all ports, is somewhat useless
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without further description of the "data" supported formats and
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uses 'int type' instead of wxBitmapType, so don't document it.
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*/
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/**
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Creates a bitmap from the given array @a bits.
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You should only use this function for monochrome bitmaps (depth 1) in
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portable programs: in this case the bits parameter should contain an XBM image.
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For other bit depths, the behaviour is platform dependent: under Windows,
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the data is passed without any changes to the underlying CreateBitmap() API.
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Under other platforms, only monochrome bitmaps may be created using this
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constructor and wxImage should be used for creating colour bitmaps from
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static data.
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@param bits
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Specifies an array of pixel values.
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@param width
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Specifies the width of the bitmap.
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@param height
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Specifies the height of the bitmap.
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@param depth
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Specifies the depth of the bitmap.
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If this is omitted, then a value of 1 (monochrome bitmap) is used.
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@beginWxPerlOnly
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In wxPerl use Wx::Bitmap->newFromBits(bits, width, height, depth).
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@endWxPerlOnly
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*/
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wxBitmap(const char bits[], int width, int height, int depth = 1);
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/**
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Creates a new bitmap. A depth of ::wxBITMAP_SCREEN_DEPTH indicates the
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depth of the current screen or visual.
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Some platforms only support 1 for monochrome and ::wxBITMAP_SCREEN_DEPTH for
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the current colour setting.
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A depth of 32 including an alpha channel is supported under MSW, Mac and GTK+.
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@param width
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The width of the bitmap in pixels, must be strictly positive.
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@param height
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The height of the bitmap in pixels, must be strictly positive.
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@param depth
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The number of bits used to represent each bitmap pixel.
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*/
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wxBitmap(int width, int height, int depth = wxBITMAP_SCREEN_DEPTH);
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/**
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@overload
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*/
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wxBitmap(const wxSize& sz, int depth = wxBITMAP_SCREEN_DEPTH);
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/**
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Creates a bitmap from XPM data.
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@beginWxPerlOnly
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In wxPerl use Wx::Bitmap->newFromXPM(data).
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@endWxPerlOnly
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*/
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wxBitmap(const char* const* bits);
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/**
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Loads a bitmap from a file or resource.
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@param name
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This can refer to a resource name or a filename under MS Windows and X.
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Its meaning is determined by the @a type parameter.
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@param type
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May be one of the ::wxBitmapType values and indicates which type of
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bitmap should be loaded. See the note in the class detailed description.
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Note that the wxBITMAP_DEFAULT_TYPE constant has different value under
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different wxWidgets ports. See the bitmap.h header for the value it takes
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for a specific port.
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@see LoadFile()
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*/
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wxBitmap(const wxString& name, wxBitmapType type = wxBITMAP_DEFAULT_TYPE);
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/**
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Creates this bitmap object from the given image.
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This has to be done to actually display an image as you cannot draw an
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image directly on a window.
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The resulting bitmap will use the provided colour depth (or that of the
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current system if depth is ::wxBITMAP_SCREEN_DEPTH) which entails that a
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colour reduction may take place.
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On Windows, if there is a palette present (set with SetPalette), it will be
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used when creating the wxBitmap (most useful in 8-bit display mode).
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On other platforms, the palette is currently ignored.
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@param img
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Platform-independent wxImage object.
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@param depth
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Specifies the depth of the bitmap.
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If this is omitted, the display depth of the screen is used.
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*/
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wxBitmap(const wxImage& img, int depth = wxBITMAP_SCREEN_DEPTH);
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/**
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Creates bitmap corresponding to the given cursor.
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This can be useful to display a cursor as it cannot be drawn directly
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on a window.
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This constructor only exists in wxMSW and wxGTK (where it is
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implemented for GTK+ 2.8 or later) only.
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@param cursor A valid wxCursor.
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@since 3.1.0
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*/
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explicit wxBitmap(const wxCursor& cursor);
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/**
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Destructor.
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See @ref overview_refcount_destruct for more info.
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If the application omits to delete the bitmap explicitly, the bitmap will be
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destroyed automatically by wxWidgets when the application exits.
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@warning
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Do not delete a bitmap that is selected into a memory device context.
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*/
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virtual ~wxBitmap();
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/**
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Adds a handler to the end of the static list of format handlers.
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@param handler
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A new bitmap format handler object. There is usually only one instance
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of a given handler class in an application session.
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Note that unlike wxImage::AddHandler, there's no documented list of
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the wxBitmapHandlers available in wxWidgets.
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This is because they are platform-specific and most important, they are
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all automatically loaded at startup.
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If you want to be sure that wxBitmap can load a certain type of image,
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you'd better use wxImage::AddHandler.
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@see wxBitmapHandler
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*/
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static void AddHandler(wxBitmapHandler* handler);
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/**
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Deletes all bitmap handlers.
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This function is called by wxWidgets on exit.
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*/
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static void CleanUpHandlers();
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/**
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Creates an image from a platform-dependent bitmap. This preserves
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mask information so that bitmaps and images can be converted back
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and forth without loss in that respect.
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*/
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virtual wxImage ConvertToImage() const;
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/**
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Creates the bitmap from an icon.
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*/
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virtual bool CopyFromIcon(const wxIcon& icon);
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/**
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Creates a fresh bitmap.
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If the final argument is omitted, the display depth of the screen is used.
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@param width
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The width of the bitmap in pixels, must be strictly positive.
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@param height
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The height of the bitmap in pixels, must be strictly positive.
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@param depth
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The number of bits used to represent each bitmap pixel.
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@return @true if the creation was successful.
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*/
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virtual bool Create(int width, int height, int depth = wxBITMAP_SCREEN_DEPTH);
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/**
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@overload
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*/
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virtual bool Create(const wxSize& sz, int depth = wxBITMAP_SCREEN_DEPTH);
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/**
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Create a bitmap compatible with the given DC, inheriting its magnification factor
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@param width
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The width of the bitmap in pixels, must be strictly positive.
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@param height
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The height of the bitmap in pixels, must be strictly positive.
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@param dc
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DC from wich the scaling factor is inherited
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@return @true if the creation was successful.
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@since 3.1.0
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*/
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bool Create(int width, int height, const wxDC& dc);
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/**
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Create a bitmap with a scale factor, width and height are multiplied with that factor
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@param width
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The width of the bitmap in pixels, must be strictly positive.
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@param height
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The height of the bitmap in pixels, must be strictly positive.
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@param depth
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The number of bits used to represent each bitmap pixel.
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@param logicalScale
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Scale factor used by the bitmap
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@return @true if the creation was successful.
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@since 3.1.0
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*/
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bool CreateScaled(int logwidth, int logheight, int depth, double logicalScale);
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/*
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Creates a bitmap from the given data, which can be of arbitrary type.
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@param data
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Data whose type depends on the value of type.
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@param type
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A bitmap type identifier; see ::wxBitmapType for the list of values.
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See the note in the class detailed description for more info.
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@param width
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The width of the bitmap in pixels.
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@param height
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The height of the bitmap in pixels.
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@param depth
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The depth of the bitmap in pixels. If this is -1, the screen depth is used.
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@return @true if the call succeeded, @false otherwise.
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This overload depends on the @a type of data.
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virtual bool Create(const void* data, int type, int width,
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int height, int depth = -1);
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NOTE: leave this undoc for the same reason of the relative ctor.
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*/
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/**
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Finds the handler with the given @a name.
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@return A pointer to the handler if found, @NULL otherwise.
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*/
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static wxBitmapHandler* FindHandler(const wxString& name);
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/**
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Finds the handler associated with the given @a extension and @a type.
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@param extension
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The file extension, such as "bmp" (without the dot).
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@param bitmapType
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The bitmap type managed by the handler, see ::wxBitmapType.
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@return A pointer to the handler if found, @NULL otherwise.
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*/
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static wxBitmapHandler* FindHandler(const wxString& extension,
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wxBitmapType bitmapType);
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/**
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Finds the handler associated with the given bitmap type.
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@param bitmapType
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The bitmap type managed by the handler, see ::wxBitmapType.
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@return A pointer to the handler if found, @NULL otherwise.
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@see wxBitmapHandler
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*/
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static wxBitmapHandler* FindHandler(wxBitmapType bitmapType);
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/**
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Gets the colour depth of the bitmap.
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A value of 1 indicates a monochrome bitmap.
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*/
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virtual int GetDepth() const;
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/**
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Returns the static list of bitmap format handlers.
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@see wxBitmapHandler
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*/
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static wxList& GetHandlers();
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/**
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Gets the height of the bitmap in pixels.
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@see GetWidth(), GetSize()
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*/
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virtual int GetHeight() const;
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/**
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Gets the associated mask (if any) which may have been loaded from a file
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or set for the bitmap.
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@see SetMask(), wxMask
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*/
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virtual wxMask* GetMask() const;
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/**
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Gets the associated palette (if any) which may have been loaded from a file
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or set for the bitmap.
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@see wxPalette
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*/
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virtual wxPalette* GetPalette() const;
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/**
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Returns a sub bitmap of the current one as long as the rect belongs entirely to
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the bitmap. This function preserves bit depth and mask information.
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*/
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virtual wxBitmap GetSubBitmap(const wxRect& rect) const;
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/**
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Returns the size of the bitmap in pixels.
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|
|
|
@since 2.9.0
|
|
|
|
@see GetHeight(), GetWidth()
|
|
*/
|
|
wxSize GetSize() const;
|
|
|
|
/**
|
|
Returns disabled (dimmed) version of the bitmap.
|
|
|
|
This method is not available when <code>wxUSE_IMAGE == 0</code>.
|
|
|
|
@since 2.9.0
|
|
*/
|
|
wxBitmap ConvertToDisabled(unsigned char brightness = 255) const;
|
|
|
|
/**
|
|
Gets the width of the bitmap in pixels.
|
|
|
|
@see GetHeight(), GetSize()
|
|
*/
|
|
virtual int GetWidth() const;
|
|
|
|
/**
|
|
Adds the standard bitmap format handlers, which, depending on wxWidgets
|
|
configuration, can be handlers for Windows bitmap, Windows bitmap resource,
|
|
and XPM.
|
|
|
|
This function is called by wxWidgets on startup.
|
|
|
|
@see wxBitmapHandler
|
|
*/
|
|
static void InitStandardHandlers();
|
|
|
|
/**
|
|
Adds a handler at the start of the static list of format handlers.
|
|
|
|
@param handler
|
|
A new bitmap format handler object. There is usually only one instance
|
|
of a given handler class in an application session.
|
|
|
|
@see wxBitmapHandler
|
|
*/
|
|
static void InsertHandler(wxBitmapHandler* handler);
|
|
|
|
/**
|
|
Returns @true if bitmap data is present.
|
|
*/
|
|
virtual bool IsOk() const;
|
|
|
|
/**
|
|
Loads a bitmap from a file or resource.
|
|
|
|
@param name
|
|
Either a filename or a Windows resource name.
|
|
The meaning of name is determined by the @a type parameter.
|
|
@param type
|
|
One of the ::wxBitmapType values; see the note in the class
|
|
detailed description.
|
|
Note that the wxBITMAP_DEFAULT_TYPE constant has different value under
|
|
different wxWidgets ports. See the bitmap.h header for the value it takes
|
|
for a specific port.
|
|
|
|
@return @true if the operation succeeded, @false otherwise.
|
|
|
|
@remarks A palette may be associated with the bitmap if one exists
|
|
(especially for colour Windows bitmaps), and if the
|
|
code supports it. You can check if one has been created
|
|
by using the GetPalette() member.
|
|
|
|
@see SaveFile()
|
|
*/
|
|
virtual bool LoadFile(const wxString& name, wxBitmapType type = wxBITMAP_DEFAULT_TYPE);
|
|
|
|
/**
|
|
Loads a bitmap from the memory containing image data in PNG format.
|
|
|
|
This helper function provides the simplest way to create a wxBitmap
|
|
from PNG image data. On most platforms, it's simply a wrapper around
|
|
wxImage loading functions and so requires the PNG image handler to be
|
|
registered by either calling wxInitAllImageHandlers() which also
|
|
registers all the other image formats or including the necessary
|
|
header:
|
|
@code
|
|
#include <wx/imagpng.h>
|
|
@endcode
|
|
and calling
|
|
@code
|
|
wxImage::AddHandler(new wxPNGHandler);
|
|
@endcode
|
|
in your application startup code.
|
|
|
|
However under OS X this function uses native image loading and so
|
|
doesn't require wxWidgets PNG support.
|
|
|
|
@since 2.9.5
|
|
*/
|
|
static wxBitmap NewFromPNGData(const void* data, size_t size);
|
|
|
|
/**
|
|
Finds the handler with the given name, and removes it.
|
|
The handler is not deleted.
|
|
|
|
@param name
|
|
The handler name.
|
|
|
|
@return @true if the handler was found and removed, @false otherwise.
|
|
|
|
@see wxBitmapHandler
|
|
*/
|
|
static bool RemoveHandler(const wxString& name);
|
|
|
|
/**
|
|
Saves a bitmap in the named file.
|
|
|
|
@param name
|
|
A filename. The meaning of name is determined by the type parameter.
|
|
@param type
|
|
One of the ::wxBitmapType values; see the note in the class
|
|
detailed description.
|
|
@param palette
|
|
An optional palette used for saving the bitmap.
|
|
|
|
@return @true if the operation succeeded, @false otherwise.
|
|
|
|
@remarks Depending on how wxWidgets has been configured, not all formats
|
|
may be available.
|
|
|
|
@see LoadFile()
|
|
*/
|
|
virtual bool SaveFile(const wxString& name, wxBitmapType type,
|
|
const wxPalette* palette = NULL) const;
|
|
|
|
/**
|
|
@deprecated This function is deprecated since version 3.1.2, dimensions
|
|
and depth can only be set at construction time.
|
|
|
|
Sets the depth member (does not affect the bitmap data).
|
|
|
|
@param depth
|
|
Bitmap depth.
|
|
|
|
*/
|
|
virtual void SetDepth(int depth);
|
|
|
|
/**
|
|
@deprecated This function is deprecated since version 3.1.2, dimensions
|
|
and depth can only be set at construction time.
|
|
|
|
Sets the height member (does not affect the bitmap data).
|
|
|
|
@param height
|
|
Bitmap height in pixels.
|
|
*/
|
|
virtual void SetHeight(int height);
|
|
|
|
/**
|
|
Sets the mask for this bitmap.
|
|
|
|
@remarks The bitmap object owns the mask once this has been called.
|
|
|
|
@see GetMask(), wxMask
|
|
*/
|
|
virtual void SetMask(wxMask* mask);
|
|
|
|
/**
|
|
Sets the associated palette. (Not implemented under GTK+).
|
|
|
|
@param palette
|
|
The palette to set.
|
|
|
|
@see wxPalette
|
|
*/
|
|
virtual void SetPalette(const wxPalette& palette);
|
|
|
|
/**
|
|
@deprecated This function is deprecated since version 3.1.2, dimensions
|
|
and depth can only be set at construction time.
|
|
|
|
Sets the width member (does not affect the bitmap data).
|
|
|
|
@param width
|
|
Bitmap width in pixels.
|
|
*/
|
|
virtual void SetWidth(int width);
|
|
};
|
|
|
|
/**
|
|
An empty wxBitmap object.
|
|
*/
|
|
wxBitmap wxNullBitmap;
|
|
|
|
|
|
|
|
|
|
/**
|
|
@class wxMask
|
|
|
|
This class encapsulates a monochrome mask bitmap, where the masked area is
|
|
black and the unmasked area is white.
|
|
|
|
When associated with a bitmap and drawn in a device context, the unmasked
|
|
area of the bitmap will be drawn, and the masked area will not be drawn.
|
|
|
|
@library{wxcore}
|
|
@category{gdi}
|
|
|
|
@see wxBitmap, wxDC::Blit, wxMemoryDC
|
|
*/
|
|
class wxMask : public wxObject
|
|
{
|
|
public:
|
|
|
|
/**
|
|
Default constructor.
|
|
*/
|
|
wxMask();
|
|
|
|
/**
|
|
Constructs a mask from a bitmap and a palette index that indicates the
|
|
background.
|
|
Not implemented for GTK.
|
|
|
|
@param bitmap
|
|
A valid bitmap.
|
|
@param index
|
|
Index into a palette, specifying the transparency colour.
|
|
*/
|
|
wxMask(const wxBitmap& bitmap, int index);
|
|
|
|
/**
|
|
Constructs a mask from a monochrome bitmap.
|
|
*/
|
|
wxMask(const wxBitmap& bitmap);
|
|
|
|
/**
|
|
Constructs a mask from a bitmap and a colour that indicates the background.
|
|
*/
|
|
wxMask(const wxBitmap& bitmap, const wxColour& colour);
|
|
|
|
/**
|
|
Destroys the wxMask object and the underlying bitmap data.
|
|
*/
|
|
virtual ~wxMask();
|
|
|
|
/**
|
|
Constructs a mask from a bitmap and a palette index that indicates the
|
|
background.
|
|
Not implemented for GTK.
|
|
|
|
@param bitmap
|
|
A valid bitmap.
|
|
@param index
|
|
Index into a palette, specifying the transparency colour.
|
|
*/
|
|
bool Create(const wxBitmap& bitmap, int index);
|
|
|
|
/**
|
|
Constructs a mask from a monochrome bitmap.
|
|
*/
|
|
bool Create(const wxBitmap& bitmap);
|
|
|
|
/**
|
|
Constructs a mask from a bitmap and a colour that indicates the background.
|
|
*/
|
|
bool Create(const wxBitmap& bitmap, const wxColour& colour);
|
|
|
|
/**
|
|
Returns the mask as a monochrome bitmap.
|
|
Currently this method is implemented in wxMSW, wxGTK and wxOSX.
|
|
|
|
@since 2.9.5
|
|
*/
|
|
wxBitmap GetBitmap() const;
|
|
};
|
|
|