X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/fadc2df6823d988f7a264b94e69a7e1bbcac1337..1d4b9c37cb6ecec51b0a16db42776ce100d2ee7a:/interface/wx/image.h diff --git a/interface/wx/image.h b/interface/wx/image.h index 72d9a52757..0477244094 100644 --- a/interface/wx/image.h +++ b/interface/wx/image.h @@ -6,6 +6,58 @@ // Licence: wxWindows license ///////////////////////////////////////////////////////////////////////////// +/** + Possible values for the image resolution option. + + @see wxImage::GetOptionInt(). + */ +enum wxImageResolution +{ + /// Resolution not specified. + wxIMAGE_RESOLUTION_NONE = 0, + + /// Resolution specified in inches. + wxIMAGE_RESOLUTION_INCHES = 1, + + /// Resolution specified in centimetres. + wxIMAGE_RESOLUTION_CM = 2 +}; + +/** + Image resize algorithm. + + This is used with wxImage::Scale() and wxImage::Rescale(). + */ +enum wxImageResizeQuality +{ + /// Simplest and fastest algorithm. + wxIMAGE_QUALITY_NEAREST, + + /// Compromise between wxIMAGE_QUALITY_NEAREST and wxIMAGE_QUALITY_BICUBIC. + wxIMAGE_QUALITY_BILINEAR, + + /// Highest quality but slowest execution time. + wxIMAGE_QUALITY_BICUBIC, + + /// Default image resizing algorithm used by wxImage::Scale(). + wxIMAGE_QUALITY_NORMAL, + + /// Best image resizing algorithm, currently same as wxIMAGE_QUALITY_BICUBIC. + wxIMAGE_QUALITY_HIGH +}; + +/** + Possible values for PNG image type option. + + @see wxImage::GetOptionInt(). + */ +enum wxImagePNGType +{ + wxPNG_TYPE_COLOUR = 0, ///< Colour PNG image. + wxPNG_TYPE_GREY = 2, ///< Greyscale PNG image converted from RGB. + wxPNG_TYPE_GREY_RED = 3 ///< Greyscale PNG image using red as grey. +}; + /** @class wxImageHandler @@ -15,7 +67,7 @@ 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. @@ -34,7 +86,7 @@ ::wxNullImage @library{wxcore} - @category{misc} + @category{gdi} @see wxImage, wxInitAllImageHandlers() */ @@ -55,10 +107,41 @@ public: 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 @@ -66,10 +149,14 @@ public: @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); @@ -109,8 +196,8 @@ public: @see wxImage::LoadFile, wxImage::SaveFile, SaveFile() */ - bool LoadFile(wxImage* image, wxInputStream& stream, - bool verbose = true, int index = 0); + virtual bool LoadFile(wxImage* image, wxInputStream& stream, + bool verbose = true, int index = -1); /** Saves a image in the output stream. @@ -119,21 +206,39 @@ public: The image object which is to be affected by this operation. @param stream Opened output stream for writing the data. + @param verbose + If set to @true, errors reported by the image handler will produce + wxLogMessages. @return @true if the operation succeeded, @false otherwise. @see wxImage::LoadFile, wxImage::SaveFile, LoadFile() */ - bool SaveFile(wxImage* image, wxOutputStream& stream); + virtual bool SaveFile(wxImage* image, wxOutputStream& 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. @@ -194,10 +299,10 @@ const unsigned char wxIMAGE_ALPHA_OPAQUE = 0xff; 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. @@ -242,6 +347,10 @@ const unsigned char wxIMAGE_ALPHA_OPAQUE = 0xff; 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: @@ -249,12 +358,15 @@ 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: @@ -262,7 +374,7 @@ 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); @@ -287,6 +399,11 @@ public: */ 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 then the wxImage will take ownership of the data and free it @@ -302,7 +419,12 @@ public: 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 @@ -324,11 +446,21 @@ public: 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. @param xpmData A pointer to XPM image data. + + @beginWxPerlOnly + Not supported by wxPerl. + @endWxPerlOnly */ wxImage(const char* const* xpmData); @@ -413,7 +545,6 @@ public: */ wxImage(wxInputStream& stream, const wxString& mimetype, int index = -1); - /** Destructor. @@ -422,214 +553,399 @@ public: */ 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 Returns number of colours in the histogram. + @return @true if the call succeeded, @false otherwise. */ - unsigned long ComputeHistogram(wxImageHistogram& histogram) const; + bool Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data = false ); /** - If the image has alpha channel, this method converts it to mask. - - 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(). + @overload + */ + bool Create( const wxSize& sz, unsigned char* data, unsigned char* alpha, bool static_data = false ); - If the image image doesn't have alpha channel, ConvertAlphaToMask() does nothing. + /** + Initialize the image data with zeroes (the default) or with the + byte value given as @a value. - @return @false if FindFirstUnusedColour returns @false, @true otherwise. + @since 2.9.0 */ - bool ConvertAlphaToMask(unsigned char threshold = 128); + void Clear(unsigned char value = 0); /** - @deprecated - Use the equivalent @ref wxBitmap::wxBitmap "wxBitmap constructor" - (which takes wxImage and depth as its arguments) instead. + Destroys the image data. */ - wxBitmap ConvertToBitmap() const; + void Destroy(); /** - Returns a greyscale version of the image. + Initializes the image alpha channel data. - 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). + 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. */ - wxImage ConvertToGreyscale(double lr = 0.299, double lg = 0.587, - double lb = 0.114) const; + void InitAlpha(); - /** - 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; /** - Returns an identical copy of the image. + @name Image manipulation 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. - - @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 both horizontal and vertical directions by the + specified pixel @a blurRadius. This should not be used when using + a single mask colour for transparency. - @return @true if the call succeeded, @false otherwise. + @see BlurHorizontal(), BlurVertical() */ - bool Create(int width, int height, bool clear = true); + wxImage Blur(int blurRadius) const; /** - Destroys the image data. + Blurs the image in the horizontal direction only. This should not be used + when using a single mask colour for transparency. + + @see Blur(), BlurVertical() */ - void Destroy(); + wxImage BlurHorizontal(int blurRadius) 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. + Blurs the image in the vertical direction only. This should not be used + when using a single mask colour for transparency. - @note - This method involves computing the histogram, which is a - computationally intensive operation. + @see Blur(), BlurHorizontal() */ - bool FindFirstUnusedColour(unsigned char* r, unsigned char* g, - unsigned char* b, unsigned char startR = 1, - unsigned char startG = 0, - unsigned char startB = 0) const; + wxImage BlurVertical(int blurRadius) const; /** - Finds the handler with the given name. - - @param name - The handler name. - - @return A pointer to the handler if found, @NULL otherwise. + Returns a mirrored copy of the image. + The parameter @a horizontally indicates the orientation. + */ + wxImage Mirror(bool horizontally = true) const; - @see wxImageHandler + /** + Copy the data of the given @a image to the specified position in this image. */ - static wxImageHandler* FindHandler(const wxString& name); + void Paste(const wxImage& image, int x, int y); /** - Finds the handler associated with the given extension and type. + 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); - @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, + wxImageResizeQuality 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; + + /** + 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, see wxImageResizeQuality documentation. + + 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() + */ + wxImage Scale(int width, int height, + wxImageResizeQuality 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. + + 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. + */ + bool ConvertAlphaToMask(unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD); + + /** + If the image has alpha channel, this method converts it to mask using + the specified colour as the mask colour. + + 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 weight_r) + (G * @a weight_g) + (B * @a weight_b). + */ + wxImage ConvertToGreyscale(double weight_r, double weight_g, double weight_b) const; + + /** + Returns a greyscale version of the image. + @since 2.9.0 + */ + wxImage ConvertToGreyscale() 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; + + /** + Returns disabled (dimmed) version of the image. + @since 2.9.0 + */ + wxImage ConvertToDisabled(unsigned char brightness = 255) const; + + //@} + + + /** + @name Miscellaneous functions + */ + //@{ + + /** + 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 + + @return Returns number of colours in the histogram. + */ + 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 + */ + //@{ /** Returns pointer to the array storing the alpha values for this image. @@ -638,12 +954,7 @@ public: does have it, this pointer may be used to directly manipulate the alpha values which are stored as the RGB ones. */ - const unsigned char * GetAlpha() const; - - /** - Returns the blue intensity at the given coordinate. - */ - unsigned char GetBlue(int x, int y) const; + unsigned char* GetAlpha() const; /** Returns the image data as an array. @@ -660,74 +971,34 @@ public: 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. + 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. @@ -735,39 +1006,114 @@ public: 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; /** - Gets a user-defined option. The function is case-insensitive to @a name. + Returns the size of the image in pixels. - 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). + @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 @c wxIMAGE_OPTION_FILENAME: The name of the file from which the image + was loaded. + + @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; /** - Gets a user-defined option as an integer. + Gets a user-defined integer-valued option. + The function is case-insensitive to @a name. If the given option is not present, the function returns 0. Use HasOption() is 0 is a possibly valid value for the option. - Options for wxPNGHandler: - @li wxIMAGE_OPTION_PNG_FORMAT: Format for saving a PNG file. - @li wxIMAGE_OPTION_PNG_BITDEPTH: Bit depth for every channel (R/G/B/A). + Generic options: + @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 + max height given if it is not 0. This is typically used for loading + thumbnails and the advantage of using these options compared to + calling Rescale() after loading is that some handlers (only JPEG + one right now) support rescaling the image during loading which is + vastly more efficient than loading the entire huge image and + rescaling it later (if these options are not supported by the + handler, this is still what happens however). These options must be + set before calling LoadFile() to have any effect. + + @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 @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 @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 + the image resolution (currently BMP, JPEG and TIFF handlers do) and + the image provides the resolution information and can be queried + after loading the image. + + Options specific to wxPNGHandler: + @li @c wxIMAGE_OPTION_PNG_FORMAT: Format for saving a PNG file, see + wxImagePNGType for the supported values. + @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. - Supported values for wxIMAGE_OPTION_PNG_FORMAT: - @li wxPNG_TYPE_COLOUR: Stores RGB image. - @li wxPNG_TYPE_GREY: Stores grey image, converts from RGB. - @li wxPNG_TYPE_GREY_RED: Stores grey image, uses red value as grey. + @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. @see SetOption(), GetOption() */ @@ -777,8 +1123,8 @@ public: Get the current mask colour or find a suitable unused colour that could be used as a mask colour. Returns @true if the image currently has a mask. */ - bool GetOrFindMaskColour(unsigned char r, unsigned char g, - unsigned char b) const; + bool GetOrFindMaskColour(unsigned char* r, unsigned char* g, + unsigned char* b) const; /** Returns the palette associated with the image. @@ -790,11 +1136,6 @@ public: */ 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. @@ -808,18 +1149,6 @@ public: */ wxBitmapType GetType() const; - /** - Gets the width of the image in pixels. - - @see GetHeight() - */ - int GetWidth() const; - - /** - Converts a color in HSV color space to RGB color space. - */ - wxImage::RGBValue HSVtoRGB(const wxImage::HSVValue & hsv); - /** Returns @true if this image has alpha channel, @false otherwise. @@ -836,42 +1165,13 @@ public: 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. */ @@ -882,7 +1182,16 @@ public: colour if this image has a mask or if this image has alpha channel and alpha value of this pixel is strictly less than @a threshold. */ - bool IsTransparent(int x, int y, unsigned char threshold = 128) const; + 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. @@ -928,7 +1237,9 @@ public: @see SaveFile() */ - bool LoadFile(wxInputStream& stream, wxBitmapType type, int index = -1); + virtual bool LoadFile(wxInputStream& stream, + wxBitmapType type = wxBITMAP_TYPE_ANY, + int index = -1); /** Loads an image from a file. @@ -953,120 +1264,25 @@ public: Name of the file from which to load the image. @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. - */ - 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. + @param index + See the description in the LoadFile(wxInputStream&, wxBitmapType, int) overload. */ - wxImage Rotate90(bool clockwise = true) const; + virtual bool LoadFile(const wxString& name, const wxString& mimetype, + int index = -1); /** - 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. + 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. */ - void RotateHue(double angle); + virtual bool LoadFile(wxInputStream& stream, const wxString& mimetype, + int index = -1); /** Saves an image in the given stream. @@ -1149,52 +1365,14 @@ public: */ 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. @@ -1228,11 +1406,17 @@ public: 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); + 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. @@ -1273,18 +1457,23 @@ public: 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. @@ -1300,7 +1489,8 @@ public: This routine performs bounds-checks for the coordinate so it can be considered a safe way to manipulate the data. */ - void SetRGB(wxRect& rect, unsigned char red, + void SetRGB(const wxRect& rect, + unsigned char red, unsigned char green, unsigned char blue); @@ -1323,45 +1513,224 @@ public: */ 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 + */ + //@{ - 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. + /** + Register an image handler. + See @ref image_handlers for a list of the available handlers. + */ + static void AddHandler(wxImageHandler* handler); - 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). + /** + Deletes all image handlers. + This function is called by wxWidgets on exit. + */ + static void CleanUpHandlers(); - Otherwise, the areas will be filled with the colour with the specified RGB components. + /** + Finds the handler with the given name. - @see Resize() + @param name + The handler name. + + @return A pointer to the handler if found, @NULL otherwise. + + @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 + */ + 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. */ - wxImage operator =(const wxImage& image); + 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