If you wish to extend the capabilities of wxImage, derive a class from
wxImageHandler and add the handler using wxImage::AddHandler in your
- application initialisation.
+ application initialization.
Note that all wxImageHandlers provided by wxWidgets are part of
the @ref page_libs_wxcore library.
virtual ~wxImageHandler();
/**
- Gets the file extension associated with this handler.
+ Gets the preferred file extension associated with this handler.
+
+ @see GetAltExtensions()
*/
const wxString& GetExtension() const;
+ /**
+ Returns the other file extensions associated with this handler.
+
+ The preferred extension for this handler is returned by GetExtension().
+
+ @since 2.9.0
+ */
+ const wxArrayString& GetAltExtensions() const;
+
/**
If the image file contains more than one image and the image handler is capable
of retrieving these individually, this function will return the number of
Currently, the stream must support seeking.
@return Number of available images. For most image handlers, this is 1
- (exceptions are TIFF and ICO formats).
+ (exceptions are TIFF and ICO formats as well as animated GIFs
+ for which this function returns the number of frames in the
+ animation).
*/
virtual int GetImageCount(wxInputStream& stream);
bool verbose = true);
/**
- Sets the handler extension.
+ Sets the preferred file extension associated with this handler.
@param extension
- Handler extension.
+ File extension without leading dot.
+
+ @see SetAltExtensions()
*/
void SetExtension(const wxString& extension);
+ /**
+ Sets the alternative file extensions associated with this handler.
+
+ @param extensions
+ Array of file extensions.
+
+ @see SetExtension()
+
+ @since 2.9.0
+ */
+ void SetAltExtensions(const wxArrayString& extensions);
+
/**
Sets the handler MIME type.
class wxImage : public wxObject
{
public:
+ /**
+ A simple class which stores red, green and blue values as 8 bit unsigned integers
+ in the range of 0-255.
+ */
class RGBValue
{
public:
Constructor for RGBValue, an object that contains values for red, green
and blue which represent the value of a color.
- It is used by wxImage::HSVtoRGB and wxImage::RGBtoHSV, which converts
+ It is used by wxImage::HSVtoRGB and wxImage::RGBtoHSV, which convert
between HSV color space and RGB color space.
*/
RGBValue(unsigned char r=0, unsigned char g=0, unsigned char b=0);
};
+ /**
+ A simple class which stores hue, saturation and value as doubles in the range 0.0-1.0.
+ */
class HSVValue
{
public:
Constructor for HSVValue, an object that contains values for hue, saturation
and value which represent the value of a color.
- It is used by wxImage::HSVtoRGB() and wxImage::RGBtoHSV(), which converts
+ It is used by wxImage::HSVtoRGB() and wxImage::RGBtoHSV(), which convert
between HSV color space and RGB color space.
*/
HSVValue(double h=0.0, double s=0.0, double v=0.0);
If @true, initialize the image to black.
*/
wxImage(int width, int height, bool clear = true);
+
+ /**
+ @overload
+ */
+ wxImage(const wxSize& sz, bool clear = true);
/**
Creates an image from data in memory. If @a static_data is @false
Indicates if the data should be free'd after use
*/
- wxImage(int width, int height, unsigned char* data, bool static_data = false);
+ wxImage(int width, int height, unsigned char* data, bool static_data = false);
+ /**
+ @overload
+ */
+ wxImage(const wxSize& sz, unsigned char* data, bool static_data = false);
+
/**
Creates an image from data in memory. If @a static_data is @false
then the wxImage will take ownership of the data and free it
wxImage(int width, int height, unsigned char* data, unsigned char* alpha,
bool static_data = false );
+ /**
+ @overload
+ */
+ wxImage(const wxSize& sz, unsigned char* data, unsigned char* data, unsigned char* alpha,
+ bool static_data = false);
+
/**
Creates an image from XPM data.
*/
wxImage(wxInputStream& stream, const wxString& mimetype, int index = -1);
-
/**
Destructor.
*/
virtual ~wxImage();
+
+
/**
- Register an image handler.
+ @name Image creation, initialization and deletion functions
*/
- static void AddHandler(wxImageHandler* handler);
+ //@{
+
+ /**
+ Returns an identical copy of this image.
+ */
+ wxImage Copy() const;
+
+ /**
+ Creates a fresh image.
+ See wxImage::wxImage(int,int,bool) for more info.
+
+ @return @true if the call succeeded, @false otherwise.
+ */
+ bool Create(int width, int height, bool clear = true);
+
+ /**
+ @overload
+ */
+ bool Create( const wxSize& sz, bool clear = true );
+
+ /**
+ Creates a fresh image.
+ See wxImage::wxImage(int,int,unsigned char*,bool) for more info.
+
+ @return @true if the call succeeded, @false otherwise.
+ */
+ bool Create( int width, int height, unsigned char* data, bool static_data = false );
+
+ /**
+ @overload
+ */
+ bool Create( const wxSize& sz, unsigned char* data, bool static_data = false );
+
+ /**
+ Creates a fresh image.
+ See wxImage::wxImage(int,int,unsigned char*,unsigned char*,bool) for more info.
+
+ @return @true if the call succeeded, @false otherwise.
+ */
+ bool Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data = false );
+
+ /**
+ @overload
+ */
+ bool Create( const wxSize& sz, unsigned char* data, unsigned char* alpha, bool static_data = false );
+
+ /**
+ Initialize the image data with zeroes (the default) or with the
+ byte value given as @a value.
+
+ @since 2.9.0
+ */
+ void Clear(unsigned char value = 0);
+
+ /**
+ Destroys the image data.
+ */
+ void Destroy();
+
+ /**
+ Initializes the image alpha channel data.
+
+ It is an error to call it if the image already has alpha data.
+ If it doesn't, alpha data will be by default initialized to all pixels
+ being fully opaque. But if the image has a mask colour, all mask pixels
+ will be completely transparent.
+ */
+ void InitAlpha();
+
+ //@}
+
+
+ /**
+ @name Image manipulation functions
+ */
+ //@{
/**
Blurs the image in both horizontal and vertical directions by the
wxImage BlurVertical(int blurRadius) const;
/**
- Returns @true if the current image handlers can read this file
+ Returns a mirrored copy of the image.
+ The parameter @a horizontally indicates the orientation.
*/
- static bool CanRead(const wxString& filename);
+ wxImage Mirror(bool horizontally = true) const;
/**
- Deletes all image handlers.
- This function is called by wxWidgets on exit.
+ Copy the data of the given @a image to the specified position in this image.
*/
- static void CleanUpHandlers();
+ void Paste(const wxImage& image, int x, int y);
/**
- Computes the histogram of the image. @a histogram is a reference to
- wxImageHistogram object. wxImageHistogram is a specialization of
- wxHashMap "template" and is defined as follows:
+ Replaces the colour specified by @e r1,g1,b1 by the colour @e r2,g2,b2.
+ */
+ void Replace(unsigned char r1, unsigned char g1,
+ unsigned char b1, unsigned char r2,
+ unsigned char g2, unsigned char b2);
+
+ /**
+ Changes the size of the image in-place by scaling it: after a call to this
+ function,the image will have the given width and height.
+
+ For a description of the @a quality parameter, see the Scale() function.
+ Returns the (modified) image itself.
+
+ @see Scale()
+ */
+ wxImage& Rescale(int width, int height,
+ int quality = wxIMAGE_QUALITY_NORMAL);
+
+ /**
+ Changes the size of the image in-place without scaling it by adding either a
+ border with the given colour or cropping as necessary.
+
+ The image is pasted into a new image with the given @a size and background
+ colour at the position @a pos relative to the upper left of the new image.
+
+ If @a red = green = blue = -1 then use either the current mask colour
+ if set or find, use, and set a suitable mask colour for any newly exposed
+ areas.
+
+ @return The (modified) image itself.
+ @see Size()
+ */
+ wxImage& Resize(const wxSize& size, const wxPoint& pos, int red = -1,
+ int green = -1, int blue = -1);
+
+ /**
+ Rotates the image about the given point, by @a angle radians.
+
+ Passing @true to @a interpolating results in better image quality, but is slower.
+
+ If the image has a mask, then the mask colour is used for the uncovered
+ pixels in the rotated image background. Else, black (rgb 0, 0, 0) will be used.
+
+ Returns the rotated image, leaving this image intact.
+ */
+ wxImage Rotate(double angle, const wxPoint& rotationCentre,
+ bool interpolating = true,
+ wxPoint* offsetAfterRotation = NULL) const;
+
+ /**
+ Returns a copy of the image rotated 90 degrees in the direction
+ indicated by @a clockwise.
+ */
+ wxImage Rotate90(bool clockwise = true) const;
+
+ /**
+ Rotates the hue of each pixel in the image by @e angle, which is a double in
+ the range of -1.0 to +1.0, where -1.0 corresponds to -360 degrees and +1.0
+ corresponds to +360 degrees.
+ */
+ void RotateHue(double angle);
+
+ /**
+ Returns a scaled version of the image.
+
+ This is also useful for scaling bitmaps in general as the only other way
+ to scale bitmaps is to blit a wxMemoryDC into another wxMemoryDC.
+
+ The parameter @a quality determines what method to use for resampling the image.
+ Can be one of the following:
+ - wxIMAGE_QUALITY_NORMAL: Uses the normal default scaling method of pixel
+ replication
+ - wxIMAGE_QUALITY_HIGH: Uses bicubic and box averaging resampling methods
+ for upsampling and downsampling respectively
+
+ It should be noted that although using @c wxIMAGE_QUALITY_HIGH produces much nicer
+ looking results it is a slower method. Downsampling will use the box averaging
+ method which seems to operate very fast. If you are upsampling larger images using
+ this method you will most likely notice that it is a bit slower and in extreme
+ cases it will be quite substantially slower as the bicubic algorithm has to process a
+ lot of data.
+
+ It should also be noted that the high quality scaling may not work as expected
+ when using a single mask colour for transparency, as the scaling will blur the
+ image and will therefore remove the mask partially. Using the alpha channel
+ will work.
+
+ Example:
@code
- class WXDLLEXPORT wxImageHistogramEntry
+ // get the bitmap from somewhere
+ wxBitmap bmp = ...;
+
+ // rescale it to have size of 32*32
+ if ( bmp.GetWidth() != 32 || bmp.GetHeight() != 32 )
{
- public:
- wxImageHistogramEntry() : index(0), value(0) {}
- unsigned long index;
- unsigned long value;
- };
+ wxImage image = bmp.ConvertToImage();
+ bmp = wxBitmap(image.Scale(32, 32));
- WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
- wxIntegerHash, wxIntegerEqual,
- wxImageHistogram);
+ // another possibility:
+ image.Rescale(32, 32);
+ bmp = image;
+ }
@endcode
- @return Returns number of colours in the histogram.
+ @see Rescale()
*/
- unsigned long ComputeHistogram(wxImageHistogram& histogram) const;
+ wxImage Scale(int width, int height,
+ int quality = wxIMAGE_QUALITY_NORMAL) const;
+
+ /**
+ Returns a resized version of this image without scaling it by adding either a
+ border with the given colour or cropping as necessary.
+
+ The image is pasted into a new image with the given @a size and background
+ colour at the position @a pos relative to the upper left of the new image.
+
+ If @a red = green = blue = -1 then the areas of the larger image not covered
+ by this image are made transparent by filling them with the image mask colour
+ (which will be allocated automatically if it isn't currently set).
+
+ Otherwise, the areas will be filled with the colour with the specified RGB components.
+
+ @see Resize()
+ */
+ wxImage Size(const wxSize& size, const wxPoint& pos, int red = -1,
+ int green = -1, int blue = -1) const;
+ //@}
+
+
+ /**
+ @name Conversion functions
+ */
//@{
+
/**
If the image has alpha channel, this method converts it to mask.
*/
void ConvertAlphaToMask(unsigned char mr, unsigned char mg, unsigned char mb,
unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD);
- //@}
/**
Returns a greyscale version of the image.
colour and black colour everywhere else.
*/
wxImage ConvertToMono(unsigned char r, unsigned char g, unsigned char b) const;
-
+
+ //@}
+
+
/**
- Returns an identical copy of the image.
+ @name Miscellaneous functions
*/
- wxImage Copy() const;
-
+ //@{
+
/**
- Creates a fresh image.
-
- If @a clear is @true, the new image will be initialized to black.
- Otherwise, the image data will be uninitialized.
+ Computes the histogram of the image. @a histogram is a reference to
+ wxImageHistogram object. wxImageHistogram is a specialization of
+ wxHashMap "template" and is defined as follows:
- @param width
- The width of the image in pixels.
- @param height
- The height of the image in pixels.
- @param clear
- If @true, initialize the image data with zeroes.
+ @code
+ class WXDLLEXPORT wxImageHistogramEntry
+ {
+ public:
+ wxImageHistogramEntry() : index(0), value(0) {}
+ unsigned long index;
+ unsigned long value;
+ };
- @return @true if the call succeeded, @false otherwise.
- */
- bool Create(int width, int height, bool clear = true);
-
- /**
- Initialize the image data with zeroes (the default) or with the
- byte value given as @a value.
-
- @since 2.9.0
- */
- void Clear(unsigned char value = 0);
+ WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
+ wxIntegerHash, wxIntegerEqual,
+ wxImageHistogram);
+ @endcode
- /**
- Destroys the image data.
+ @return Returns number of colours in the histogram.
*/
- void Destroy();
-
+ unsigned long ComputeHistogram(wxImageHistogram& histogram) const;
+
/**
Finds the first colour that is never used in the image.
The search begins at given initial colour and continues by increasing
unsigned char startB = 0) const;
/**
- Finds the handler with the given name.
-
- @param name
- The handler name.
-
- @return A pointer to the handler if found, @NULL otherwise.
-
- @see wxImageHandler
- */
- static wxImageHandler* FindHandler(const wxString& name);
-
- /**
- Finds the handler associated with the given extension and type.
-
- @param extension
- The file extension, such as "bmp".
- @param imageType
- The image type; one of the ::wxBitmapType values.
-
- @return A pointer to the handler if found, @NULL otherwise.
-
- @see wxImageHandler
- */
- static wxImageHandler* FindHandler(const wxString& extension,
- wxBitmapType imageType);
-
- /**
- Finds the handler associated with the given image type.
-
- @param imageType
- The image type; one of the ::wxBitmapType values.
-
- @return A pointer to the handler if found, @NULL otherwise.
-
- @see wxImageHandler
- */
- static wxImageHandler* FindHandler(wxBitmapType imageType);
-
- /**
- Finds the handler associated with the given MIME type.
-
- @param mimetype
- MIME type.
+ Assignment operator, using @ref overview_refcount "reference counting".
- @return A pointer to the handler if found, @NULL otherwise.
+ @param image
+ Image to assign.
- @see wxImageHandler
+ @return Returns 'this' object.
*/
- static wxImageHandler* FindHandlerMime(const wxString& mimetype);
-
+ wxImage& operator=(const wxImage& image);
+
+ //@}
+
+
/**
- Return alpha value at given pixel location.
+ @name Getters
*/
- unsigned char GetAlpha(int x, int y) const;
+ //@{
/**
Returns pointer to the array storing the alpha values for this image.
*/
unsigned char* GetAlpha() const;
- /**
- Returns the blue intensity at the given coordinate.
- */
- unsigned char GetBlue(int x, int y) const;
-
/**
Returns the image data as an array.
unsigned char* GetData() const;
/**
- Returns the green intensity at the given coordinate.
+ Return alpha value at given pixel location.
*/
- unsigned char GetGreen(int x, int y) const;
+ unsigned char GetAlpha(int x, int y) const;
/**
- Returns the static list of image format handlers.
-
- @see wxImageHandler
+ Returns the red intensity at the given coordinate.
*/
- static wxList& GetHandlers();
+ unsigned char GetRed(int x, int y) const;
/**
- Gets the height of the image in pixels.
-
- @see GetWidth(), GetSize()
+ Returns the green intensity at the given coordinate.
*/
- int GetHeight() const;
+ unsigned char GetGreen(int x, int y) const;
- //@{
/**
- If the image file contains more than one image and the image handler is
- capable of retrieving these individually, this function will return the
- number of available images.
-
- For the overload taking the parameter @a filename, that's the name
- of the file to query.
- For the overload taking the parameter @a stream, that's the ppened input
- stream with image data. Currently, the stream must support seeking.
-
- The parameter @a type may be one of the following values:
- @li wxBITMAP_TYPE_BMP: Load a Windows bitmap file.
- @li wxBITMAP_TYPE_GIF: Load a GIF bitmap file.
- @li wxBITMAP_TYPE_JPEG: Load a JPEG bitmap file.
- @li wxBITMAP_TYPE_PNG: Load a PNG bitmap file.
- @li wxBITMAP_TYPE_PCX: Load a PCX bitmap file.
- @li wxBITMAP_TYPE_PNM: Load a PNM bitmap file.
- @li wxBITMAP_TYPE_TIF: Load a TIFF bitmap file.
- @li wxBITMAP_TYPE_TGA: Load a TGA bitmap file.
- @li wxBITMAP_TYPE_XPM: Load a XPM bitmap file.
- @li wxBITMAP_TYPE_ICO: Load a Windows icon file (ICO).
- @li wxBITMAP_TYPE_CUR: Load a Windows cursor file (CUR).
- @li wxBITMAP_TYPE_ANI: Load a Windows animated cursor file (ANI).
- @li wxBITMAP_TYPE_ANY: Will try to autodetect the format.
-
- @return Number of available images. For most image handlers, this is 1
- (exceptions are TIFF and ICO formats).
+ Returns the blue intensity at the given coordinate.
*/
- static int GetImageCount(const wxString& filename,
- wxBitmapType type = wxBITMAP_TYPE_ANY);
- static int GetImageCount(wxInputStream& stream,
- wxBitmapType type = wxBITMAP_TYPE_ANY);
- //@}
+ unsigned char GetBlue(int x, int y) const;
/**
- Iterates all registered wxImageHandler objects, and returns a string containing
- file extension masks suitable for passing to file open/save dialog boxes.
-
- @return The format of the returned string is @c "(*.ext1;*.ext2)|*.ext1;*.ext2".
- It is usually a good idea to prepend a description before passing
- the result to the dialog.
- Example:
- @code
- wxFileDialog FileDlg( this, "Choose Image", ::wxGetCwd(), "",
- _("Image Files ") + wxImage::GetImageExtWildcard(),
- wxFD_OPEN );
- @endcode
+ Gets the red value of the mask colour.
+ */
+ unsigned char GetMaskRed() const;
- @see wxImageHandler
+ /**
+ Gets the green value of the mask colour.
*/
- static wxString GetImageExtWildcard();
+ unsigned char GetMaskGreen() const;
/**
Gets the blue value of the mask colour.
unsigned char GetMaskBlue() const;
/**
- Gets the green value of the mask colour.
+ Gets the width of the image in pixels.
+
+ @see GetHeight(), GetSize()
*/
- unsigned char GetMaskGreen() const;
+ int GetWidth() const;
/**
- Gets the red value of the mask colour.
+ Gets the height of the image in pixels.
+
+ @see GetWidth(), GetSize()
*/
- unsigned char GetMaskRed() const;
+ int GetHeight() const;
+
+ /**
+ Returns the size of the image in pixels.
+
+ @since 2.9.0
+ @see GetHeight(), GetWidth()
+ */
+ wxSize GetSize() const;
+
/**
Gets a user-defined string-valued option.
*/
const wxPalette& GetPalette() const;
- /**
- Returns the red intensity at the given coordinate.
- */
- unsigned char GetRed(int x, int y) const;
-
/**
Returns a sub image of the current one as long as the rect belongs entirely
to the image.
*/
wxImage GetSubImage(const wxRect& rect) const;
- /**
- Returns the size of the image in pixels.
-
- @since 2.9.0
-
- @see GetHeight(), GetWidth()
- */
- wxSize GetSize() const;
-
/**
Gets the type of image found by LoadFile() or specified with SaveFile().
*/
wxBitmapType GetType() const;
- /**
- Gets the width of the image in pixels.
-
- @see GetHeight(), GetSize()
- */
- int GetWidth() const;
-
- /**
- Converts a color in HSV color space to RGB color space.
- */
- static wxImage::RGBValue HSVtoRGB(const wxImage::HSVValue& hsv);
-
/**
Returns @true if this image has alpha channel, @false otherwise.
*/
bool HasOption(const wxString& name) const;
- /**
- Initializes the image alpha channel data.
-
- It is an error to call it if the image already has alpha data.
- If it doesn't, alpha data will be by default initialized to all pixels
- being fully opaque. But if the image has a mask colour, all mask pixels
- will be completely transparent.
- */
- void InitAlpha();
-
- /**
- Internal use only. Adds standard image format handlers.
- It only install wxBMPHandler for the time being, which is used by wxBitmap.
-
- This function is called by wxWidgets on startup, and shouldn't be called by
- the user.
-
- @see wxImageHandler, wxInitAllImageHandlers(), wxQuantize
- */
- static void InitStandardHandlers();
-
- /**
- Adds a handler at the start of the static list of format handlers.
-
- @param handler
- A new image format handler object. There is usually only one instance
- of a given handler class in an application session.
-
- @see wxImageHandler
- */
- static void InsertHandler(wxImageHandler* handler);
-
/**
Returns @true if image data is present.
*/
bool IsTransparent(int x, int y,
unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD) const;
+ //@}
+
+
+ /**
+ @name Loading and saving functions
+ */
+ //@{
+
/**
Loads an image from an input stream.
virtual bool LoadFile(const wxString& name, const wxString& mimetype,
int index = -1);
-
/**
Loads an image from an input stream.
int index = -1);
/**
- Returns a mirrored copy of the image.
- The parameter @a horizontally indicates the orientation.
- */
- wxImage Mirror(bool horizontally = true) const;
+ Saves an image in the given stream.
- /**
- Copy the data of the given @a image to the specified position in this image.
- */
- void Paste(const wxImage& image, int x, int y);
+ @param stream
+ Opened output stream to save the image to.
+ @param mimetype
+ MIME type.
- /**
- Converts a color in RGB color space to HSV color space.
- */
- static wxImage::HSVValue RGBtoHSV(const wxImage::RGBValue& rgb);
-
- /**
- 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 wxImageHandler
- */
- static bool RemoveHandler(const wxString& name);
-
- /**
- Replaces the colour specified by @e r1,g1,b1 by the colour @e r2,g2,b2.
- */
- void Replace(unsigned char r1, unsigned char g1,
- unsigned char b1, unsigned char r2,
- unsigned char g2, unsigned char b2);
-
- /**
- Changes the size of the image in-place by scaling it: after a call to this
- function,the image will have the given width and height.
-
- For a description of the @a quality parameter, see the Scale() function.
- Returns the (modified) image itself.
-
- @see Scale()
- */
- wxImage& Rescale(int width, int height,
- int quality = wxIMAGE_QUALITY_NORMAL);
-
- /**
- Changes the size of the image in-place without scaling it by adding either a
- border with the given colour or cropping as necessary.
-
- The image is pasted into a new image with the given @a size and background
- colour at the position @a pos relative to the upper left of the new image.
-
- If @a red = green = blue = -1 then use either the current mask colour
- if set or find, use, and set a suitable mask colour for any newly exposed
- areas.
-
- @return The (modified) image itself.
-
- @see Size()
- */
- wxImage& Resize(const wxSize& size, const wxPoint& pos, int red = -1,
- int green = -1, int blue = -1);
-
- /**
- Rotates the image about the given point, by @a angle radians.
-
- Passing @true to @a interpolating results in better image quality, but is slower.
-
- If the image has a mask, then the mask colour is used for the uncovered
- pixels in the rotated image background. Else, black (rgb 0, 0, 0) will be used.
-
- Returns the rotated image, leaving this image intact.
- */
- wxImage Rotate(double angle, const wxPoint& rotationCentre,
- bool interpolating = true,
- wxPoint* offsetAfterRotation = NULL) const;
-
- /**
- Returns a copy of the image rotated 90 degrees in the direction
- indicated by @a clockwise.
- */
- wxImage Rotate90(bool clockwise = true) const;
-
- /**
- Rotates the hue of each pixel in the image by @e angle, which is a double in
- the range of -1.0 to +1.0, where -1.0 corresponds to -360 degrees and +1.0
- corresponds to +360 degrees.
- */
- void RotateHue(double angle);
-
- /**
- Saves an image in the given stream.
-
- @param stream
- Opened output stream to save the image to.
- @param mimetype
- MIME type.
-
- @return @true if the operation succeeded, @false otherwise.
+ @return @true if the operation succeeded, @false otherwise.
@remarks Depending on how wxWidgets has been configured, not all formats
may be available.
*/
virtual bool SaveFile(wxOutputStream& stream, wxBitmapType type) const;
- /**
- Returns a scaled version of the image.
-
- This is also useful for scaling bitmaps in general as the only other way
- to scale bitmaps is to blit a wxMemoryDC into another wxMemoryDC.
-
- The parameter @a quality determines what method to use for resampling the image.
- Can be one of the following:
- - wxIMAGE_QUALITY_NORMAL: Uses the normal default scaling method of pixel
- replication
- - wxIMAGE_QUALITY_HIGH: Uses bicubic and box averaging resampling methods
- for upsampling and downsampling respectively
-
- It should be noted that although using @c wxIMAGE_QUALITY_HIGH produces much nicer
- looking results it is a slower method. Downsampling will use the box averaging
- method which seems to operate very fast. If you are upsampling larger images using
- this method you will most likely notice that it is a bit slower and in extreme
- cases it will be quite substantially slower as the bicubic algorithm has to process a
- lot of data.
-
- It should also be noted that the high quality scaling may not work as expected
- when using a single mask colour for transparency, as the scaling will blur the
- image and will therefore remove the mask partially. Using the alpha channel
- will work.
-
- Example:
- @code
- // get the bitmap from somewhere
- wxBitmap bmp = ...;
+ //@}
- // rescale it to have size of 32*32
- if ( bmp.GetWidth() != 32 || bmp.GetHeight() != 32 )
- {
- wxImage image = bmp.ConvertToImage();
- bmp = wxBitmap(image.Scale(32, 32));
- // another possibility:
- image.Rescale(32, 32);
- bmp = image;
- }
- @endcode
- @see Rescale()
+ /**
+ @name Setters
*/
- wxImage Scale(int width, int height,
- int quality = wxIMAGE_QUALITY_NORMAL) const;
+ //@{
/**
This function is similar to SetData() and has similar restrictions.
*/
void SetAlpha(int x, int y, unsigned char alpha);
- //@{
/**
Sets the image data without performing checks.
The data must have been allocated with @c malloc(), @b NOT with
@c operator new.
- After this call the pointer to the data is owned by the wxImage object,
- that will be responsible for deleting it.
+ If @a static_data is @false, after this call the pointer to the data is
+ owned by the wxImage object, that will be responsible for deleting it.
Do not pass to this function a pointer obtained through GetData().
*/
void SetData(unsigned char* data, bool static_data = false);
+
+ /**
+ @overload
+ */
void SetData(unsigned char* data, int new_width, int new_height,
bool static_data = false);
- //@}
/**
Specifies whether there is a mask or not.
unsigned char mg,
unsigned char mb);
- //@{
/**
Sets a user-defined option. The function is case-insensitive to @a name.
@see GetOption(), GetOptionInt(), HasOption()
*/
void SetOption(const wxString& name, const wxString& value);
+
+ /**
+ @overload
+ */
void SetOption(const wxString& name, int value);
- //@}
/**
Associates a palette with the image.
*/
void SetType(wxBitmapType type);
+ //@}
+
+
+
/**
- Returns a resized version of this image without scaling it by adding either a
- border with the given colour or cropping as necessary.
+ @name Handler management functions
+ */
+ //@{
+
+ /**
+ Register an image handler.
+ See @ref image_handlers for a list of the available handlers.
+ */
+ static void AddHandler(wxImageHandler* handler);
- The image is pasted into a new image with the given @a size and background
- colour at the position @a pos relative to the upper left of the new image.
+ /**
+ Deletes all image handlers.
+ This function is called by wxWidgets on exit.
+ */
+ static void CleanUpHandlers();
+
+ /**
+ Finds the handler with the given name.
- If @a red = green = blue = -1 then the areas of the larger image not covered
- by this image are made transparent by filling them with the image mask colour
- (which will be allocated automatically if it isn't currently set).
+ @param name
+ The handler name.
- Otherwise, the areas will be filled with the colour with the specified RGB components.
+ @return A pointer to the handler if found, @NULL otherwise.
- @see Resize()
+ @see wxImageHandler
*/
- wxImage Size(const wxSize& size, const wxPoint& pos, int red = -1,
- int green = -1, int blue = -1) const;
+ static wxImageHandler* FindHandler(const wxString& name);
/**
- Assignment operator, using @ref overview_refcount "reference counting".
+ Finds the handler associated with the given extension and type.
- @param image
- Image to assign.
+ @param extension
+ The file extension, such as "bmp".
+ @param imageType
+ The image type; one of the ::wxBitmapType values.
- @return Returns 'this' object.
+ @return A pointer to the handler if found, @NULL otherwise.
+
+ @see wxImageHandler
*/
- wxImage& operator=(const wxImage& image);
+ static wxImageHandler* FindHandler(const wxString& extension,
+ wxBitmapType imageType);
+
+ /**
+ Finds the handler associated with the given image type.
+
+ @param imageType
+ The image type; one of the ::wxBitmapType values.
+
+ @return A pointer to the handler if found, @NULL otherwise.
+
+ @see wxImageHandler
+ */
+ static wxImageHandler* FindHandler(wxBitmapType imageType);
+
+ /**
+ Finds the handler associated with the given MIME type.
+
+ @param mimetype
+ MIME type.
+
+ @return A pointer to the handler if found, @NULL otherwise.
+
+ @see wxImageHandler
+ */
+ static wxImageHandler* FindHandlerMime(const wxString& mimetype);
+
+ /**
+ Returns the static list of image format handlers.
+
+ @see wxImageHandler
+ */
+ static wxList& GetHandlers();
+
+ /**
+ Internal use only. Adds standard image format handlers.
+ It only install wxBMPHandler for the time being, which is used by wxBitmap.
+
+ This function is called by wxWidgets on startup, and shouldn't be called by
+ the user.
+
+ @see wxImageHandler, wxInitAllImageHandlers(), wxQuantize
+ */
+ static void InitStandardHandlers();
+
+ /**
+ Adds a handler at the start of the static list of format handlers.
+
+ @param handler
+ A new image format handler object. There is usually only one instance
+ of a given handler class in an application session.
+
+ @see wxImageHandler
+ */
+ static void InsertHandler(wxImageHandler* handler);
+
+ /**
+ 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 wxImageHandler
+ */
+ static bool RemoveHandler(const wxString& name);
+
+ //@}
+
+
+ /**
+ Returns @true if the current image handlers can read this file
+ */
+ static bool CanRead(const wxString& filename);
+
+ //@{
+ /**
+ If the image file contains more than one image and the image handler is
+ capable of retrieving these individually, this function will return the
+ number of available images.
+
+ For the overload taking the parameter @a filename, that's the name
+ of the file to query.
+ For the overload taking the parameter @a stream, that's the ppened input
+ stream with image data. Currently, the stream must support seeking.
+
+ The parameter @a type may be one of the following values:
+ @li wxBITMAP_TYPE_BMP: Load a Windows bitmap file.
+ @li wxBITMAP_TYPE_GIF: Load a GIF bitmap file.
+ @li wxBITMAP_TYPE_JPEG: Load a JPEG bitmap file.
+ @li wxBITMAP_TYPE_PNG: Load a PNG bitmap file.
+ @li wxBITMAP_TYPE_PCX: Load a PCX bitmap file.
+ @li wxBITMAP_TYPE_PNM: Load a PNM bitmap file.
+ @li wxBITMAP_TYPE_TIF: Load a TIFF bitmap file.
+ @li wxBITMAP_TYPE_TGA: Load a TGA bitmap file.
+ @li wxBITMAP_TYPE_XPM: Load a XPM bitmap file.
+ @li wxBITMAP_TYPE_ICO: Load a Windows icon file (ICO).
+ @li wxBITMAP_TYPE_CUR: Load a Windows cursor file (CUR).
+ @li wxBITMAP_TYPE_ANI: Load a Windows animated cursor file (ANI).
+ @li wxBITMAP_TYPE_ANY: Will try to autodetect the format.
+
+ @return Number of available images. For most image handlers, this is 1
+ (exceptions are TIFF and ICO formats as well as animated GIFs
+ for which this function returns the number of frames in the
+ animation).
+ */
+ static int GetImageCount(const wxString& filename,
+ wxBitmapType type = wxBITMAP_TYPE_ANY);
+ static int GetImageCount(wxInputStream& stream,
+ wxBitmapType type = wxBITMAP_TYPE_ANY);
+ //@}
+
+ /**
+ Iterates all registered wxImageHandler objects, and returns a string containing
+ file extension masks suitable for passing to file open/save dialog boxes.
+
+ @return The format of the returned string is @c "(*.ext1;*.ext2)|*.ext1;*.ext2".
+ It is usually a good idea to prepend a description before passing
+ the result to the dialog.
+ Example:
+ @code
+ wxFileDialog FileDlg( this, "Choose Image", ::wxGetCwd(), "",
+ _("Image Files ") + wxImage::GetImageExtWildcard(),
+ wxFD_OPEN );
+ @endcode
+
+ @see wxImageHandler
+ */
+ static wxString GetImageExtWildcard();
+
+ /**
+ Converts a color in RGB color space to HSV color space.
+ */
+ static wxImage::HSVValue RGBtoHSV(const wxImage::RGBValue& rgb);
+
+ /**
+ Converts a color in HSV color space to RGB color space.
+ */
+ static wxImage::RGBValue HSVtoRGB(const wxImage::HSVValue& hsv);
};
/**
/**
Initializes all available image handlers. For a list of available handlers,
see wxImage.
+ If you don't need/want all image handlers loaded
@see wxImage, wxImageHandler
projects / wxWidgets.git / blobdiff