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.
::wxNullImage
@library{wxcore}
- @category{misc}
+ @category{gdi}
@see wxImage, wxInitAllImageHandlers()
*/
virtual ~wxImageHandler();
/**
- Gets the file extension associated with this handler.
+ Returns @true if this handler supports the image format contained in the
+ given stream.
+
+ This function doesn't modify the current stream position (because it
+ restores the original position before returning; this however requires the
+ stream to be seekable; see wxStreamBase::IsSeekable).
+ */
+ bool CanRead( wxInputStream& stream );
+
+ /**
+ Returns @true if this handler supports the image format contained in the
+ file with the given name.
+
+ This function doesn't modify the current stream position (because it
+ restores the original position before returning; this however requires the
+ stream to be seekable; see wxStreamBase::IsSeekable).
+ */
+ bool CanRead( const wxString& filename );
+
+ /**
+ 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
@param stream
Opened input stream for reading image data.
- Currently, the stream must support seeking.
+ This function doesn't modify the current stream position (because it
+ restores the original position before returning; this however requires the
+ stream to be seekable; see wxStreamBase::IsSeekable).
@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.
The constants ::wxIMAGE_ALPHA_TRANSPARENT and ::wxIMAGE_ALPHA_OPAQUE can be
used to indicate those values in a more readable form.
- Unlike RGB data, not all images have an alpha channel and before using
- wxImage::GetAlpha you should check if this image contains an alpha channel
- with wxImage::HasAlpha. Note that currently only the PNG format has full
- alpha channel support so only the images loaded from PNG files can have
+ While all images have RGB data, not all images have an alpha channel. Before
+ using wxImage::GetAlpha you should check if this image contains an alpha
+ channel with wxImage::HasAlpha. Note that currently only the PNG format has
+ full alpha channel support so only the images loaded from PNG files can have
alpha and, if you initialize the image alpha channel yourself using
wxImage::SetAlpha, you should save it in PNG format to avoid losing it.
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);
-
+ //@{
+
/**
- Blurs the image in both horizontal and vertical directions by the
- specified pixel @a blurRadius. This should not be used when using
- a single mask colour for transparency.
-
- @see BlurHorizontal(), BlurVertical()
+ Returns an identical copy of this image.
*/
- wxImage Blur(int blurRadius) const;
+ wxImage Copy() const;
/**
- Blurs the image in the horizontal direction only. This should not be used
- when using a single mask colour for transparency.
+ Creates a fresh image.
+ See wxImage::wxImage(int,int,bool) for more info.
- @see Blur(), BlurVertical()
+ @return @true if the call succeeded, @false otherwise.
*/
- wxImage BlurHorizontal(int blurRadius) const;
+ bool Create(int width, int height, bool clear = true);
/**
- Blurs the image in the vertical direction only. This should not be used
- when using a single mask colour for transparency.
-
- @see Blur(), BlurHorizontal()
+ @overload
*/
- wxImage BlurVertical(int blurRadius) const;
+ bool Create( const wxSize& sz, bool clear = true );
/**
- Returns @true if the current image handlers can read this file
+ Creates a fresh image.
+ See wxImage::wxImage(int,int,unsigned char*,bool) for more info.
+
+ @return @true if the call succeeded, @false otherwise.
*/
- static bool CanRead(const wxString& filename);
+ bool Create( int width, int height, unsigned char* data, bool static_data = false );
/**
- Deletes all image handlers.
- This function is called by wxWidgets on exit.
+ @overload
*/
- static void CleanUpHandlers();
+ bool Create( const wxSize& sz, unsigned char* data, bool static_data = false );
/**
- 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:
-
- @code
- class WXDLLEXPORT wxImageHistogramEntry
- {
- public:
- wxImageHistogramEntry() : index(0), value(0) {}
- unsigned long index;
- unsigned long value;
- };
-
- WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
- wxIntegerHash, wxIntegerEqual,
- wxImageHistogram);
- @endcode
+ 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.
- @return Returns number of colours in the histogram.
+ @since 2.9.0
*/
- unsigned long ComputeHistogram(wxImageHistogram& histogram) const;
+ void Clear(unsigned char value = 0);
/**
- If the image has alpha channel, this method converts it to mask.
+ Destroys the image data.
+ */
+ void Destroy();
+
+ /**
+ Initializes the image alpha channel data.
- All pixels with alpha value less than @a threshold are replaced with mask
- colour and the alpha channel is removed. Mask colour is chosen automatically
- using FindFirstUnusedColour().
+ 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();
- If the image image doesn't have alpha channel, ConvertAlphaToMask() does nothing.
+ //@}
- @return @false if FindFirstUnusedColour returns @false, @true otherwise.
- */
- bool ConvertAlphaToMask(unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD);
/**
- Returns a greyscale version of the image.
-
- The returned image uses the luminance component of the original to
- calculate the greyscale. Defaults to using the standard ITU-T BT.601
- when converting to YUV, where every pixel equals
- (R * @a lr) + (G * @a lg) + (B * @a lb).
+ @name Image manipulation functions
*/
- wxImage ConvertToGreyscale(double lr = 0.299, double lg = 0.587, double lb = 1.114) const;
+ //@{
/**
- Returns monochromatic version of the image.
+ Blurs the image in both horizontal and vertical directions by the
+ specified pixel @a blurRadius. This should not be used when using
+ a single mask colour for transparency.
- The returned image has white colour where the original has @e (r,g,b)
- colour and black colour everywhere else.
+ @see BlurHorizontal(), BlurVertical()
*/
- wxImage ConvertToMono(unsigned char r, unsigned char g, unsigned char b) const;
+ wxImage Blur(int blurRadius) const;
/**
- Returns an identical copy of the image.
+ Blurs the image in the horizontal direction only. This should not be used
+ when using a single mask colour for transparency.
+
+ @see Blur(), BlurVertical()
*/
- wxImage Copy() const;
+ wxImage BlurHorizontal(int blurRadius) 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.
-
- @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 zeros.
+ Blurs the image in the vertical direction only. This should not be used
+ when using a single mask colour for transparency.
- @return @true if the call succeeded, @false otherwise.
+ @see Blur(), BlurHorizontal()
*/
- bool Create(int width, int height, bool clear = true);
+ wxImage BlurVertical(int blurRadius) const;
/**
- Destroys the image data.
+ Returns a mirrored copy of the image.
+ The parameter @a horizontally indicates the orientation.
*/
- void Destroy();
+ wxImage Mirror(bool horizontally = true) const;
/**
- Finds the first colour that is never used in the image.
- The search begins at given initial colour and continues by increasing
- R, G and B components (in this order) by 1 until an unused colour is
- found or the colour space exhausted.
-
- The parameters @a r, @a g, @a b are pointers to variables to save the colour.
-
- The parameters @a startR, @a startG, @a startB define the initial values
- of the colour.
- The returned colour will have RGB values equal to or greater than these.
-
- @return Returns @false if there is no unused colour left, @true on success.
-
- @note
- This method involves computing the histogram, which is a
- computationally intensive operation.
+ Copy the data of the given @a image to the specified position in this image.
*/
- bool FindFirstUnusedColour(unsigned char* r, unsigned char* g,
- unsigned char* b, unsigned char startR = 1,
- unsigned char startG = 0,
- unsigned char startB = 0) const;
+ void Paste(const wxImage& image, int x, int y);
/**
- Finds the handler with the given name.
-
- @param name
- The handler name.
-
- @return A pointer to the handler if found, @NULL otherwise.
-
- @see wxImageHandler
+ Replaces the colour specified by @e r1,g1,b1 by the colour @e r2,g2,b2.
*/
- static wxImageHandler* FindHandler(const wxString& name);
+ void Replace(unsigned char r1, unsigned char g1,
+ unsigned char b1, unsigned char r2,
+ unsigned char g2, unsigned char b2);
/**
- 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.
+ 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.
- @return A pointer to the handler if found, @NULL otherwise.
+ For a description of the @a quality parameter, see the Scale() function.
+ Returns the (modified) image itself.
- @see wxImageHandler
+ @see Scale()
*/
- static wxImageHandler* FindHandler(const wxString& extension,
- wxBitmapType imageType);
+ wxImage& Rescale(int width, int height,
+ int quality = wxIMAGE_QUALITY_NORMAL);
/**
- Finds the handler associated with the given image type.
+ Changes the size of the image in-place without scaling it by adding either a
+ border with the given colour or cropping as necessary.
- @param imageType
- The image type; one of the ::wxBitmapType values.
+ 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.
- @return A pointer to the handler if found, @NULL otherwise.
+ 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.
- @see wxImageHandler
+ @return The (modified) image itself.
+
+ @see Size()
*/
- static wxImageHandler* FindHandler(wxBitmapType imageType);
+ wxImage& Resize(const wxSize& size, const wxPoint& pos, int red = -1,
+ int green = -1, int blue = -1);
/**
- Finds the handler associated with the given MIME type.
+ Rotates the image about the given point, by @a angle radians.
- @param mimetype
- MIME type.
+ Passing @true to @a interpolating results in better image quality, but is slower.
- @return A pointer to the handler if found, @NULL otherwise.
+ 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.
- @see wxImageHandler
+ Returns the rotated image, leaving this image intact.
*/
- static wxImageHandler* FindHandlerMime(const wxString& mimetype);
+ wxImage Rotate(double angle, const wxPoint& rotationCentre,
+ bool interpolating = true,
+ wxPoint* offsetAfterRotation = NULL) const;
/**
- Return alpha value at given pixel location.
+ Returns a copy of the image rotated 90 degrees in the direction
+ indicated by @a clockwise.
*/
- unsigned char GetAlpha(int x, int y) const;
+ wxImage Rotate90(bool clockwise = true) const;
/**
- Returns pointer to the array storing the alpha values for this image.
-
- This pointer is @NULL for the images without the alpha channel. If the image
- does have it, this pointer may be used to directly manipulate the alpha values
- which are stored as the RGB ones.
+ 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.
*/
- unsigned char* GetAlpha() const;
+ void RotateHue(double angle);
/**
- Returns the blue intensity at the given coordinate.
- */
- unsigned char GetBlue(int x, int y) const;
+ Returns a scaled version of the image.
- /**
- Returns the image data as an array.
+ 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.
- This is most often used when doing direct image manipulation.
- The return value points to an array of characters in RGBRGBRGB... format
- in the top-to-bottom, left-to-right order, that is the first RGB triplet
- corresponds to the pixel first pixel of the first row, the second one ---
- to the second pixel of the first row and so on until the end of the first
- row, with second row following after it and so on.
+ 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
- You should not delete the returned pointer nor pass it to SetData().
+ 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()
*/
- unsigned char* GetData() 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;
+
+ //@}
+
/**
- Returns the green intensity at the given coordinate.
+ @name Conversion functions
*/
- unsigned char GetGreen(int x, int y) const;
+ //@{
/**
- Returns the static list of image format handlers.
+ If the image has alpha channel, this method converts it to mask.
- @see wxImageHandler
+ If the image has an alpha channel, all pixels with alpha value less
+ than @a threshold are replaced with the mask colour and the alpha
+ channel is removed. Otherwise nothing is done.
+
+ The mask colour is chosen automatically using
+ FindFirstUnusedColour() by this function, see the overload below if you
+ this is not appropriate.
+
+ @return @false if FindFirstUnusedColour returns @false, @true otherwise.
*/
- static wxList GetHandlers();
+ bool ConvertAlphaToMask(unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD);
/**
- Gets the height of the image in pixels.
+ If the image has alpha channel, this method converts it to mask using
+ the specified colour as the mask colour.
- @see GetWidth(), GetSize()
+ If the image has an alpha channel, all pixels with alpha value less
+ than @a threshold are replaced with the mask colour and the alpha
+ channel is removed. Otherwise nothing is done.
+
+ @since 2.9.0
+
+ @param mr
+ The red component of the mask colour.
+ @param mg
+ The green component of the mask colour.
+ @param mb
+ The blue component of the mask colour.
+ @param threshold
+ Pixels with alpha channel values below the given threshold are
+ considered to be transparent, i.e. the corresponding mask pixels
+ are set. Pixels with the alpha values above the threshold are
+ considered to be opaque.
+
+ */
+ void ConvertAlphaToMask(unsigned char mr, unsigned char mg, unsigned char mb,
+ unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD);
+
+ /**
+ Returns a greyscale version of the image.
+
+ The returned image uses the luminance component of the original to
+ calculate the greyscale. Defaults to using the standard ITU-T BT.601
+ when converting to YUV, where every pixel equals
+ (R * @a lr) + (G * @a lg) + (B * @a lb).
*/
- int GetHeight() const;
+ wxImage ConvertToGreyscale(double lr = 0.299, double lg = 0.587, double lb = 1.114) const;
+ /**
+ Returns monochromatic version of the image.
+
+ The returned image has white colour where the original has @e (r,g,b)
+ colour and black colour everywhere else.
+ */
+ wxImage ConvertToMono(unsigned char r, unsigned char g, unsigned char b) const;
+
+ //@}
+
+
+ /**
+ @name Miscellaneous functions
+ */
//@{
+
/**
- 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.
+ 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:
- 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.
+ @code
+ class WXDLLEXPORT wxImageHistogramEntry
+ {
+ public:
+ wxImageHistogramEntry() : index(0), value(0) {}
+ unsigned long index;
+ unsigned long value;
+ };
- 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.
+ WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
+ wxIntegerHash, wxIntegerEqual,
+ wxImageHistogram);
+ @endcode
- @return Number of available images. For most image handlers, this is 1
- (exceptions are TIFF and ICO formats).
+ @return Returns number of colours in the histogram.
*/
- static int GetImageCount(const wxString& filename,
- wxBitmapType type = wxBITMAP_TYPE_ANY);
- static int GetImageCount(wxInputStream& stream,
- wxBitmapType type = wxBITMAP_TYPE_ANY);
+ 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
+ R, G and B components (in this order) by 1 until an unused colour is
+ found or the colour space exhausted.
+
+ The parameters @a r, @a g, @a b are pointers to variables to save the colour.
+
+ The parameters @a startR, @a startG, @a startB define the initial values
+ of the colour.
+ The returned colour will have RGB values equal to or greater than these.
+
+ @return Returns @false if there is no unused colour left, @true on success.
+
+ @note
+ This method involves computing the histogram, which is a
+ computationally intensive operation.
+ */
+ bool FindFirstUnusedColour(unsigned char* r, unsigned char* g,
+ unsigned char* b, unsigned char startR = 1,
+ unsigned char startG = 0,
+ unsigned char startB = 0) const;
+
+ /**
+ Assignment operator, using @ref overview_refcount "reference counting".
+
+ @param image
+ Image to assign.
+
+ @return Returns 'this' object.
+ */
+ wxImage& operator=(const wxImage& image);
+
//@}
+
+
+ /**
+ @name Getters
+ */
+ //@{
/**
- Iterates all registered wxImageHandler objects, and returns a string containing
- file extension masks suitable for passing to file open/save dialog boxes.
+ Returns pointer to the array storing the alpha values for this image.
- @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
+ This pointer is @NULL for the images without the alpha channel. If the image
+ does have it, this pointer may be used to directly manipulate the alpha values
+ which are stored as the RGB ones.
+ */
+ unsigned char* GetAlpha() const;
- @see wxImageHandler
+ /**
+ Returns the image data as an array.
+
+ This is most often used when doing direct image manipulation.
+ The return value points to an array of characters in RGBRGBRGB... format
+ in the top-to-bottom, left-to-right order, that is the first RGB triplet
+ corresponds to the pixel first pixel of the first row, the second one ---
+ to the second pixel of the first row and so on until the end of the first
+ row, with second row following after it and so on.
+
+ You should not delete the returned pointer nor pass it to SetData().
*/
- static wxString GetImageExtWildcard();
+ unsigned char* GetData() const;
/**
- Gets the blue value of the mask colour.
+ Return alpha value at given pixel location.
*/
- unsigned char GetMaskBlue() const;
+ unsigned char GetAlpha(int x, int y) const;
/**
- Gets the green value of the mask colour.
+ Returns the red intensity at the given coordinate.
*/
- unsigned char GetMaskGreen() const;
+ unsigned char GetRed(int x, int y) const;
+
+ /**
+ Returns the green intensity at the given coordinate.
+ */
+ unsigned char GetGreen(int x, int y) const;
+
+ /**
+ Returns the blue intensity at the given coordinate.
+ */
+ unsigned char GetBlue(int x, int y) const;
/**
Gets the red value of the mask colour.
*/
unsigned char GetMaskRed() const;
+ /**
+ Gets the green value of the mask colour.
+ */
+ unsigned char GetMaskGreen() const;
+
+ /**
+ Gets the blue value of the mask colour.
+ */
+ unsigned char GetMaskBlue() const;
+
+ /**
+ Gets the width of the image in pixels.
+
+ @see GetHeight(), GetSize()
+ */
+ int GetWidth() const;
+
+ /**
+ Gets the height of the image in pixels.
+
+ @see GetWidth(), GetSize()
+ */
+ 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.
Currently the only defined string option is
- @li wxIMAGE_OPTION_FILENAME: The name of the file from which the image
+ @li @c wxIMAGE_OPTION_FILENAME: The name of the file from which the image
was loaded.
- @see SetOption(), GetOptionInt(), HasOption()
-
@param name
The name of the option, case-insensitive.
@return
The value of the option or an empty string if not found. Use
HasOption() if an empty string can be a valid option value.
+
+ @see SetOption(), GetOptionInt(), HasOption()
*/
wxString GetOption(const wxString& name) const;
Use HasOption() is 0 is a possibly valid value for the option.
Generic options:
- @li wxIMAGE_OPTION_MAX_WIDTH and wxIMAGE_OPTION_MAX_HEIGHT: If either
+ @li @c wxIMAGE_OPTION_MAX_WIDTH and @c wxIMAGE_OPTION_MAX_HEIGHT: If either
of these options is specified, the loaded image will be scaled down
(preserving its aspect ratio) so that its width is less than the
max width given if it is not 0 @em and its height is less than the
handler, this is still what happens however). These options must be
set before calling LoadFile() to have any effect.
- @li wxIMAGE_OPTION_QUALITY: JPEG quality used when saving. This is an
+ @li @c wxIMAGE_OPTION_QUALITY: JPEG quality used when saving. This is an
integer in 0..100 range with 0 meaning very poor and 100 excellent
(but very badly compressed). This option is currently ignored for
the other formats.
- @li wxIMAGE_OPTION_RESOLUTIONUNIT: The value of this option determines
+ @li @c wxIMAGE_OPTION_RESOLUTIONUNIT: The value of this option determines
whether the resolution of the image is specified in centimetres or
inches, see wxImageResolution enum elements.
- @li wxIMAGE_OPTION_RESOLUTION, wxIMAGE_OPTION_RESOLUTIONX and
- wxIMAGE_OPTION_RESOLUTIONY: These options define the resolution of
- the image in the units corresponding to wxIMAGE_OPTION_RESOLUTIONUNIT
+ @li @c wxIMAGE_OPTION_RESOLUTION, @c wxIMAGE_OPTION_RESOLUTIONX and
+ @c wxIMAGE_OPTION_RESOLUTIONY: These options define the resolution of
+ the image in the units corresponding to @c wxIMAGE_OPTION_RESOLUTIONUNIT
options value. The first option can be set before saving the image
to set both horizontal and vertical resolution to the same value.
The X and Y options are set by the image handlers if they support
after loading the image.
Options specific to wxPNGHandler:
- @li wxIMAGE_OPTION_PNG_FORMAT: Format for saving a PNG file, see
+ @li @c wxIMAGE_OPTION_PNG_FORMAT: Format for saving a PNG file, see
wxImagePNGType for the supported values.
- @li wxIMAGE_OPTION_PNG_BITDEPTH: Bit depth for every channel (R/G/B/A).
-
- @see SetOption(), GetOption()
+ @li @c wxIMAGE_OPTION_PNG_BITDEPTH: Bit depth for every channel (R/G/B/A).
+ @li @c wxIMAGE_OPTION_PNG_FILTER: Filter for saving a PNG file, see libpng
+ (http://www.libpng.org/pub/png/libpng-1.2.5-manual.html) for possible values
+ (e.g. PNG_FILTER_NONE, PNG_FILTER_SUB, PNG_FILTER_UP, etc).
+ @li @c wxIMAGE_OPTION_PNG_COMPRESSION_LEVEL: Compression level (0..9) for
+ saving a PNG file. An high value creates smaller-but-slower PNG file.
+ Note that unlike other formats (e.g. JPEG) the PNG format is always
+ lossless and thus this compression level doesn't tradeoff the image
+ quality.
+ @li @c wxIMAGE_OPTION_PNG_COMPRESSION_MEM_LEVEL: Compression memory usage
+ level (1..9) for saving a PNG file. An high value means the saving
+ process consumes more memory, but may create smaller PNG file.
+ @li @c wxIMAGE_OPTION_PNG_COMPRESSION_STRATEGY: Possible values are 0 for
+ default strategy, 1 for filter, and 2 for Huffman-only.
+ You can use OptiPNG (http://optipng.sourceforge.net/) to get a suitable
+ value for your application.
+ @li @c wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE: Internal buffer size
+ (in bytes) for saving a PNG file. Ideally this should be as big as
+ the resulting PNG file. Use this option if your application produces
+ images with small size variation.
@param name
The name of the option, case-insensitive.
@return
- The value of the option or 0 if not found. Use HasOption() if 0
- can be a valid option value.
+ The value of the option or 0 if not found.
+ Use HasOption() if 0 can be a valid option value.
+
+ @see SetOption(), GetOption()
*/
int GetOptionInt(const wxString& name) const;
*/
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.
Returns @true if the given option is present.
The function is case-insensitive to @a name.
+ The lists of the currently supported options are in GetOption() and
+ GetOptionInt() function docs.
+
@see SetOption(), GetOption(), GetOptionInt()
*/
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.
@param mimetype
MIME type string (for example 'image/jpeg')
@param index
- See the description in the LoadFile(wxInputStream&, wxBitmapType, int) overload.
- */
- virtual bool LoadFile(const wxString& name, const wxString& mimetype,
- int index = -1);
-
-
- /**
- Loads an image from an input stream.
-
- @param stream
- Opened input stream from which to load the image.
- Currently, the stream must support seeking.
- @param mimetype
- MIME type string (for example 'image/jpeg')
- @param index
- See the description in the LoadFile(wxInputStream&, wxBitmapType, int) overload.
- */
- virtual bool LoadFile(wxInputStream& stream, const wxString& mimetype,
- int index = -1);
-
- /**
- Returns a mirrored copy of the image.
- The parameter @a horizontally indicates the orientation.
- */
- wxImage Mirror(bool horizontally = true) const;
-
- /**
- Copy the data of the given @a image to the specified position in this image.
- */
- void Paste(const wxImage& image, int x, int y);
-
- /**
- 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.
+ See the description in the LoadFile(wxInputStream&, wxBitmapType, int) overload.
*/
- wxImage Rotate(double angle, const wxPoint& rotationCentre,
- bool interpolating = true,
- wxPoint* offsetAfterRotation = NULL) const;
+ virtual bool LoadFile(const wxString& name, const wxString& mimetype,
+ int index = -1);
/**
- Returns a copy of the image rotated 90 degrees in the direction
- indicated by @a clockwise.
- */
- wxImage Rotate90(bool clockwise = true) const;
+ Loads an image from an input stream.
- /**
- 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.
+ @param stream
+ Opened input stream from which to load the image.
+ Currently, the stream must support seeking.
+ @param mimetype
+ MIME type string (for example 'image/jpeg')
+ @param index
+ See the description in the LoadFile(wxInputStream&, wxBitmapType, int) overload.
*/
- void RotateHue(double angle);
+ virtual bool LoadFile(wxInputStream& stream, const wxString& mimetype,
+ int index = -1);
/**
Saves an image in the given stream.
*/
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.
For example, when saving as a JPEG file, the option @b quality is
used, which is a number between 0 and 100 (0 is terrible, 100 is very good).
+ The lists of the currently supported options are in GetOption() and
+ GetOptionInt() function docs.
+
@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 at least one of the available image handlers can read
+ the file with the given name.
+
+ See wxImageHandler::CanRead for more info.
+ */
+ static bool CanRead(const wxString& filename);
+
+ /**
+ Returns @true if at least one of the available image handlers can read
+ the data in the given stream.
+
+ See wxImageHandler::CanRead for more info.
+ */
+ static bool CanRead(wxInputStream& stream);
+
+ //@{
+ /**
+ 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 opened input
+ stream with image data.
+
+ See wxImageHandler::GetImageCount() for more info.
+
+ 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);
};
+/**
+ An instance of an empty image without an alpha channel.
+*/
+wxImage wxNullImage;
+
+
// ============================================================================
// Global functions/macros
// ============================================================================
-/** @ingroup group_funcmacro_appinitterm */
+/** @addtogroup group_funcmacro_appinitterm */
//@{
/**
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