wxWidgets/interface/wx/bitmap.h
Vadim Zeitlin ab6a33b4ad Fix wrong signature of wxBitmap(bits) ctor in the documentation.
This ctor takes just a "char* bits" (spelt as "char bits[]" for some reason),
not "char* bits[]".

Closes #13947.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70545 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2012-02-08 23:45:32 +00:00

757 lines
24 KiB
Objective-C

/////////////////////////////////////////////////////////////////////////////
// Name: bitmap.h
// Purpose: interface of wxBitmap* classes
// Author: wxWidgets team
// RCS-ID: $Id$
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
/**
In wxBitmap and wxBitmapHandler context this value means: "use the screen depth".
*/
#define wxBITMAP_SCREEN_DEPTH (-1)
/**
@class wxBitmapHandler
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
@ref page_libs_wxcore library.
For details about the default handlers, please see the note in the
wxBitmap class documentation.
@library{wxcore}
@category{gdi}
@see @ref overview_bitmap, wxBitmap, wxIcon, wxCursor
*/
class wxBitmapHandler : public wxObject
{
public:
/**
Default constructor.
In your own default constructor, initialise the members m_name,
m_extension and m_type.
*/
wxBitmapHandler();
/**
Destroys the wxBitmapHandler object.
*/
virtual ~wxBitmapHandler();
/**
Creates a bitmap from the given data, which can be of arbitrary type.
The wxBitmap object @a bitmap is manipulated by this function.
@param bitmap
The wxBitmap object.
@param width
The width of the bitmap in pixels.
@param height
The height of the bitmap in pixels.
@param depth
The depth of the bitmap in pixels.
If this is ::wxBITMAP_SCREEN_DEPTH, the screen depth is used.
@param data
Data whose type depends on the value of type.
@param type
A bitmap type identifier - see ::wxBitmapType for a list
of possible values.
@return @true if the call succeeded, @false otherwise (the default).
*/
virtual bool Create(wxBitmap* bitmap, const void* data, wxBitmapType type,
int width, int height, int depth = 1);
/**
Gets the file extension associated with this handler.
*/
const wxString& GetExtension() const;
/**
Gets the name of this handler.
*/
const wxString& GetName() const;
/**
Gets the bitmap type associated with this handler.
*/
wxBitmapType GetType() const;
/**
Loads a bitmap from a file or resource, putting the resulting data into
@a bitmap.
@param bitmap
The bitmap object which is to be affected by this operation.
@param name
Either a filename or a Windows resource name.
The meaning of name is determined by the type parameter.
@param type
See ::wxBitmapType for values this can take.
@param desiredWidth
The desired width for the loaded bitmap.
@param desiredHeight
The desired height for the loaded bitmap.
@return @true if the operation succeeded, @false otherwise.
@see wxBitmap::LoadFile, wxBitmap::SaveFile, SaveFile()
*/
virtual bool LoadFile(wxBitmap* bitmap, const wxString& name, wxBitmapType type,
int desiredWidth, int desiredHeight);
/**
Saves a bitmap in the named file.
@param bitmap
The bitmap object which is to be affected by this operation.
@param name
A filename. The meaning of name is determined by the type parameter.
@param type
See ::wxBitmapType for values this can take.
@param palette
An optional palette used for saving the bitmap.
@return @true if the operation succeeded, @false otherwise.
@see wxBitmap::LoadFile, wxBitmap::SaveFile, LoadFile()
*/
virtual bool SaveFile(const wxBitmap* bitmap, const wxString& name, wxBitmapType type,
const wxPalette* palette = NULL) const;
/**
Sets the handler extension.
@param extension
Handler extension.
*/
void SetExtension(const wxString& extension);
/**
Sets the handler name.
@param name
Handler name.
*/
void SetName(const wxString& name);
/**
Sets the handler type.
@param type
Handler type.
*/
void SetType(wxBitmapType type);
};
/**
@class wxBitmap
This class encapsulates the concept of a platform-dependent bitmap,
either monochrome or colour or colour with alpha channel support.
If you need direct access the bitmap data instead going through
drawing to it using wxMemoryDC you need to use the wxPixelData
class (either wxNativePixelData for RGB bitmaps or wxAlphaPixelData
for bitmaps with an additionaly alpha channel).
Note that many wxBitmap functions take a @e type parameter, which is a
value of the ::wxBitmapType enumeration.
The validity of those values depends however on the platform where your program
is running and from the wxWidgets configuration.
If all possible wxWidgets settings are used:
- wxMSW supports BMP and ICO files, BMP and ICO resources;
- wxGTK supports XPM files;
- wxMac supports PICT resources;
- wxX11 supports XPM files, XPM data, XBM data;
In addition, wxBitmap can load and save all formats that wxImage can; see wxImage
for more info. Of course, you must have loaded the wxImage handlers
(see ::wxInitAllImageHandlers() and wxImage::AddHandler).
Note that all available wxBitmapHandlers for a given wxWidgets port are
automatically loaded at startup so you won't need to use wxBitmap::AddHandler.
More on the difference between wxImage and wxBitmap: wxImage is just a
buffer of RGB bytes with an optional buffer for the alpha bytes. It is all
generic, platform independent and image file format independent code. It
includes generic code for scaling, resizing, clipping, and other manipulations
of the image data. OTOH, wxBitmap is intended to be a wrapper of whatever is
the native image format that is quickest/easiest to draw to a DC or to be the
target of the drawing operations performed on a wxMemoryDC. By splitting the
responsibilities between wxImage/wxBitmap like this then it's easier to use
generic code shared by all platforms and image types for generic operations and
platform specific code where performance or compatibility is needed.
@library{wxcore}
@category{gdi}
@stdobjects
::wxNullBitmap
@see @ref overview_bitmap, @ref overview_bitmap_supportedformats,
wxDC::Blit, wxIcon, wxCursor, wxMemoryDC, wxImage, wxPixelData
*/
class wxBitmap : public wxGDIObject
{
public:
/**
Default constructor.
Constructs a bitmap object with no data; an assignment or another member
function such as Create() or LoadFile() must be called subsequently.
*/
wxBitmap();
/**
Copy constructor, uses @ref overview_refcount "reference counting".
To make a real copy, you can use:
@code
wxBitmap newBitmap = oldBitmap.GetSubBitmap(
wxRect(0, 0, oldBitmap.GetWidth(), oldBitmap.GetHeight()));
@endcode
*/
wxBitmap(const wxBitmap& bitmap);
/*
Creates a bitmap from the given @a data which is interpreted in
platform-dependent manner.
@param data
Specifies the bitmap data in a platform-dependent format.
@param type
May be one of the ::wxBitmapType values and indicates which type of
bitmap does @a data contains. See the note in the class
detailed description.
@param width
Specifies the width of the bitmap.
@param height
Specifies the height of the bitmap.
@param depth
Specifies the depth of the bitmap.
If this is omitted, the display depth of the screen is used.
wxBitmap(const void* data, int type, int width, int height, int depth = -1);
NOTE: this ctor is not implemented by all ports, is somewhat useless
without further description of the "data" supported formats and
uses 'int type' instead of wxBitmapType, so don't document it.
*/
/**
Creates a bitmap from the given array @a bits.
You should only use this function for monochrome bitmaps (depth 1) in
portable programs: in this case the bits parameter should contain an XBM image.
For other bit depths, the behaviour is platform dependent: under Windows,
the data is passed without any changes to the underlying CreateBitmap() API.
Under other platforms, only monochrome bitmaps may be created using this
constructor and wxImage should be used for creating colour bitmaps from
static data.
@param bits
Specifies an array of pixel values.
@param width
Specifies the width of the bitmap.
@param height
Specifies the height of the bitmap.
@param depth
Specifies the depth of the bitmap.
If this is omitted, then a value of 1 (monochrome bitmap) is used.
@beginWxPerlOnly
In wxPerl use Wx::Bitmap->newFromBits(bits, width, height, depth).
@endWxPerlOnly
*/
wxBitmap(const char bits[], int width, int height, int depth = 1);
/**
Creates a new bitmap. A depth of ::wxBITMAP_SCREEN_DEPTH indicates the
depth of the current screen or visual.
Some platforms only support 1 for monochrome and ::wxBITMAP_SCREEN_DEPTH for
the current colour setting.
A depth of 32 including an alpha channel is supported under MSW, Mac and GTK+.
*/
wxBitmap(int width, int height, int depth = wxBITMAP_SCREEN_DEPTH);
/**
@overload
*/
wxBitmap(const wxSize& sz, int depth = wxBITMAP_SCREEN_DEPTH);
/**
Creates a bitmap from XPM data.
@beginWxPerlOnly
In wxPerl use Wx::Bitmap->newFromXPM(data).
@endWxPerlOnly
*/
wxBitmap(const char* const* bits);
/**
Loads a bitmap from a file or resource.
@param name
This can refer to a resource name or a filename under MS Windows and X.
Its meaning is determined by the @a type parameter.
@param type
May be one of the ::wxBitmapType values and indicates which type of
bitmap should be loaded. 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.
@see LoadFile()
*/
wxBitmap(const wxString& name, wxBitmapType type = wxBITMAP_DEFAULT_TYPE);
/**
Creates this bitmap object from the given image.
This has to be done to actually display an image as you cannot draw an
image directly on a window.
The resulting bitmap will use the provided colour depth (or that of the
current system if depth is ::wxBITMAP_SCREEN_DEPTH) which entails that a
colour reduction may take place.
When in 8-bit mode (PseudoColour mode), the GTK port will use a color cube
created on program start-up to look up colors. This ensures a very fast conversion,
but the image quality won't be perfect (and could be better for photo images using
more sophisticated dithering algorithms).
On Windows, if there is a palette present (set with SetPalette), it will be
used when creating the wxBitmap (most useful in 8-bit display mode).
On other platforms, the palette is currently ignored.
@param img
Platform-independent wxImage object.
@param depth
Specifies the depth of the bitmap.
If this is omitted, the display depth of the screen is used.
*/
wxBitmap(const wxImage& img, int depth = wxBITMAP_SCREEN_DEPTH);
/**
Destructor.
See @ref overview_refcount_destruct for more info.
If the application omits to delete the bitmap explicitly, the bitmap will be
destroyed automatically by wxWidgets when the application exits.
@warning
Do not delete a bitmap that is selected into a memory device context.
*/
virtual ~wxBitmap();
/**
Adds a handler to the end 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.
Note that unlike wxImage::AddHandler, there's no documented list of
the wxBitmapHandlers available in wxWidgets.
This is because they are platform-specific and most important, they are
all automatically loaded at startup.
If you want to be sure that wxBitmap can load a certain type of image,
you'd better use wxImage::AddHandler.
@see wxBitmapHandler
*/
static void AddHandler(wxBitmapHandler* handler);
/**
Deletes all bitmap handlers.
This function is called by wxWidgets on exit.
*/
static void CleanUpHandlers();
/**
Creates an image from a platform-dependent bitmap. This preserves
mask information so that bitmaps and images can be converted back
and forth without loss in that respect.
*/
virtual wxImage ConvertToImage() const;
/**
Creates the bitmap from an icon.
*/
virtual bool CopyFromIcon(const wxIcon& icon);
/**
Creates a fresh bitmap.
If the final argument is omitted, the display depth of the screen is used.
@return @true if the creation was successful.
*/
virtual bool Create(int width, int height, int depth = wxBITMAP_SCREEN_DEPTH);
/**
@overload
*/
virtual bool Create(const wxSize& sz, int depth = wxBITMAP_SCREEN_DEPTH);
/*
Creates a bitmap from the given data, which can be of arbitrary type.
@param data
Data whose type depends on the value of type.
@param type
A bitmap type identifier; see ::wxBitmapType for the list of values.
See the note in the class detailed description for more info.
@param width
The width of the bitmap in pixels.
@param height
The height of the bitmap in pixels.
@param depth
The depth of the bitmap in pixels. If this is -1, the screen depth is used.
@return @true if the call succeeded, @false otherwise.
This overload depends on the @a type of data.
virtual bool Create(const void* data, int type, int width,
int height, int depth = -1);
NOTE: leave this undoc for the same reason of the relative ctor.
*/
/**
Finds the handler with the given @a name.
@return A pointer to the handler if found, @NULL otherwise.
*/
static wxBitmapHandler* FindHandler(const wxString& name);
/**
Finds the handler associated with the given @a extension and @a type.
@param extension
The file extension, such as "bmp" (without the dot).
@param bitmapType
The bitmap type managed by the handler, see ::wxBitmapType.
@return A pointer to the handler if found, @NULL otherwise.
*/
static wxBitmapHandler* FindHandler(const wxString& extension,
wxBitmapType bitmapType);
/**
Finds the handler associated with the given bitmap type.
@param bitmapType
The bitmap type managed by the handler, see ::wxBitmapType.
@return A pointer to the handler if found, @NULL otherwise.
@see wxBitmapHandler
*/
static wxBitmapHandler* FindHandler(wxBitmapType bitmapType);
/**
Gets the colour depth of the bitmap.
A value of 1 indicates a monochrome bitmap.
*/
virtual int GetDepth() const;
/**
Returns the static list of bitmap format handlers.
@see wxBitmapHandler
*/
static wxList& GetHandlers();
/**
Gets the height of the bitmap in pixels.
@see GetWidth(), GetSize()
*/
virtual int GetHeight() const;
/**
Gets the associated mask (if any) which may have been loaded from a file
or set for the bitmap.
@see SetMask(), wxMask
*/
virtual wxMask* GetMask() const;
/**
Gets the associated palette (if any) which may have been loaded from a file
or set for the bitmap.
@see wxPalette
*/
virtual wxPalette* GetPalette() const;
/**
Returns a sub bitmap of the current one as long as the rect belongs entirely to
the bitmap. This function preserves bit depth and mask information.
*/
virtual wxBitmap GetSubBitmap(const wxRect& rect) const;
/**
Returns the size of the bitmap in pixels.
@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);
/**
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;
/**
Sets the depth member (does not affect the bitmap data).
@todo since these functions do not affect the bitmap data,
why they exist??
@param depth
Bitmap depth.
*/
virtual void SetDepth(int depth);
/**
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);
/**
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 yet 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.
@beginWxPythonOnly
This is the default constructor for wxMask in wxPython.
@endWxPythonOnly
*/
wxMask(const wxBitmap& bitmap);
/**
Constructs a mask from a bitmap and a colour that indicates the background.
@beginWxPythonOnly
wxPython has an alternate wxMask constructor matching this form called wxMaskColour.
@endWxPythonOnly
*/
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 yet 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);
};