Use surrounding pixels to calculate an average that will be used for
new pixels. This method is typically used when reducing the size of
an image.
+ */
wxIMAGE_QUALITY_BOX_AVERAGE,
/**
wxPNG_TYPE_PALETTE = 4 ///< Palette encoding.
};
+
+/**
+ Image option names.
+*/
+#define wxIMAGE_OPTION_QUALITY wxString(wxT("quality"))
+#define wxIMAGE_OPTION_FILENAME wxString(wxT("FileName"))
+#define wxIMAGE_OPTION_RESOLUTION wxString(wxT("Resolution"))
+#define wxIMAGE_OPTION_RESOLUTIONX wxString(wxT("ResolutionX"))
+#define wxIMAGE_OPTION_RESOLUTIONY wxString(wxT("ResolutionY"))
+#define wxIMAGE_OPTION_RESOLUTIONUNIT wxString(wxT("ResolutionUnit"))
+#define wxIMAGE_OPTION_MAX_WIDTH wxString(wxT("MaxWidth"))
+#define wxIMAGE_OPTION_MAX_HEIGHT wxString(wxT("MaxHeight"))
+
+#define wxIMAGE_OPTION_BMP_FORMAT wxString(wxT("wxBMP_FORMAT"))
+#define wxIMAGE_OPTION_CUR_HOTSPOT_X wxString(wxT("HotSpotX"))
+#define wxIMAGE_OPTION_CUR_HOTSPOT_Y wxString(wxT("HotSpotY"))
+
+#define wxIMAGE_OPTION_GIF_COMMENT wxString(wxT("GifComment"))
+
+#define wxIMAGE_OPTION_PNG_FORMAT wxString(wxT("PngFormat"))
+#define wxIMAGE_OPTION_PNG_BITDEPTH wxString(wxT("PngBitDepth"))
+#define wxIMAGE_OPTION_PNG_FILTER wxString(wxT("PngF"))
+#define wxIMAGE_OPTION_PNG_COMPRESSION_LEVEL wxString(wxT("PngZL"))
+#define wxIMAGE_OPTION_PNG_COMPRESSION_MEM_LEVEL wxString(wxT("PngZM"))
+#define wxIMAGE_OPTION_PNG_COMPRESSION_STRATEGY wxString(wxT("PngZS"))
+#define wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE wxString(wxT("PngZB"))
+
+#define wxIMAGE_OPTION_TIFF_BITSPERSAMPLE wxString(wxT("BitsPerSample"))
+#define wxIMAGE_OPTION_TIFF_SAMPLESPERPIXEL wxString(wxT("SamplesPerPixel"))
+#define wxIMAGE_OPTION_TIFF_COMPRESSION wxString(wxT("Compression"))
+#define wxIMAGE_OPTION_TIFF_PHOTOMETRIC wxString(wxT("Photometric"))
+#define wxIMAGE_OPTION_TIFF_IMAGEDESCRIPTOR wxString(wxT("ImageDescriptor"))
+
+
+enum
+{
+ wxBMP_24BPP = 24, // default, do not need to set
+ //wxBMP_16BPP = 16, // wxQuantize can only do 236 colors?
+ wxBMP_8BPP = 8, // 8bpp, quantized colors
+ wxBMP_8BPP_GREY = 9, // 8bpp, rgb averaged to greys
+ wxBMP_8BPP_GRAY = wxBMP_8BPP_GREY,
+ wxBMP_8BPP_RED = 10, // 8bpp, red used as greyscale
+ wxBMP_8BPP_PALETTE = 11, // 8bpp, use the wxImage's palette
+ wxBMP_4BPP = 4, // 4bpp, quantized colors
+ wxBMP_1BPP = 1, // 1bpp, quantized "colors"
+ wxBMP_1BPP_BW = 2 // 1bpp, black & white from red
+};
+
+
/**
@class wxImageHandler
the wxBitmap::wxBitmap(wxImage,int depth) constructor.
This bitmap can then be drawn in a device context, using wxDC::DrawBitmap.
+ More on the difference between wxImage and wxBitmap: wxImage is just a
+ buffer of RGB bytes with an optional buffer for the alpha bytes. It is all
+ generic, platform independent and image file format independent code. It
+ includes generic code for scaling, resizing, clipping, and other manipulations
+ of the image data. OTOH, wxBitmap is intended to be a wrapper of whatever is
+ the native image format that is quickest/easiest to draw to a DC or to be the
+ target of the drawing operations performed on a wxMemoryDC. By splitting the
+ responsibilities between wxImage/wxBitmap like this then it's easier to use
+ generic code shared by all platforms and image types for generic operations and
+ platform specific code where performance or compatibility is needed.
+
One colour value of the image may be used as a mask colour which will lead to
the automatic creation of a wxMask object associated to the bitmap object.
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. Currently the BMP, PNG, and TIFF format
+ channel with wxImage::HasAlpha. Currently the BMP, PNG, TGA, and TIFF format
handlers have full alpha channel support for loading so if you want to use
alpha you have to use one of these formats. If you initialize the image
alpha channel yourself using wxImage::SetAlpha, you should save it in
- either PNG or TGA format to avoid losing it as these are the only handlers
- that currently support saving with alpha.
+ either PNG, TGA, or TIFF format to avoid losing it as these are the only
+ handlers that currently support saving with alpha.
@section image_handlers Available image handlers
- wxGIFHandler: For loading and saving (see below).
- wxPCXHandler: For loading and saving (see below).
- wxPNMHandler: For loading and saving (see below).
- - wxTIFFHandler: For loading (including alpha support) and saving.
+ - wxTIFFHandler: For loading and saving. Includes alpha support.
- wxTGAHandler: For loading and saving. Includes alpha support.
- wxIFFHandler: For loading only.
- wxXPMHandler: For loading and saving.
/**
@overload
*/
- wxImage(const wxSize& sz, unsigned char* data, unsigned char* data, unsigned char* alpha,
+ wxImage(const wxSize& sz, unsigned char* data, unsigned char* alpha,
bool static_data = false);
/**
@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_TIFF: 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).
/**
Gets a user-defined string-valued option.
- Currently the only defined string option is
+ Generic options:
@li @c wxIMAGE_OPTION_FILENAME: The name of the file from which the image
was loaded.
+ Options specific to wxGIFHandler:
+ @li @c wxIMAGE_OPTION_GIF_COMMENT: The comment text that is read from
+ or written to the GIF file. In an animated GIF each frame can have
+ its own comment. If there is only a comment in the first frame of
+ a GIF it will not be repeated in other frames.
+
@param name
The name of the option, case-insensitive.
@return
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.
+ Use HasOption() if 0 is a possibly valid value for the option.
Generic options:
@li @c wxIMAGE_OPTION_MAX_WIDTH and @c wxIMAGE_OPTION_MAX_HEIGHT: If either
the resulting PNG file. Use this option if your application produces
images with small size variation.
- Options specific to wxGIFHandler:
- @li @c wxIMAGE_OPTION_GIF_COMMENT: The comment text that is read from
- or written to the GIF file. In an animated GIF each frame can have
- its own comment. If there is only a comment in the first frame of
- a GIF it will not be repeated in other frames.
+ Options specific to wxTIFFHandler:
+ @li @c wxIMAGE_OPTION_TIFF_BITSPERSAMPLE: Number of bits per
+ sample (channel). Currently values of 1 and 8 are supported. A
+ value of 1 results in a black and white image. A value of 8 (the
+ default) can mean greyscale or RGB, depending on the value of
+ @c wxIMAGE_OPTION_TIFF_SAMPLESPERPIXEL.
+ @li @c wxIMAGE_OPTION_TIFF_SAMPLESPERPIXEL: Number of samples
+ (channels) per pixel. Currently values of 1 and 3 are supported.
+ A value of 1 results in either a greyscale (by default) or black and
+ white image, depending on the value of
+ @c wxIMAGE_OPTION_TIFF_BITSPERSAMPLE. A value of 3 (the default)
+ will result in an RGB image.
+ @li @c wxIMAGE_OPTION_TIFF_COMPRESSION: Compression type. By default
+ it is set to 1 (COMPRESSION_NONE). Typical other values are
+ 5 (COMPRESSION_LZW) and 7 (COMPRESSION_JPEG). See tiff.h for more
+ options.
+ @li @c wxIMAGE_OPTION_TIFF_PHOTOMETRIC: Specifies the photometric
+ interpretation. By default it is set to 2 (PHOTOMETRIC_RGB) for RGB
+ images and 0 (PHOTOMETRIC_MINISWHITE) for greyscale or black and
+ white images. It can also be set to 1 (PHOTOMETRIC_MINISBLACK) to
+ treat the lowest value as black and highest as white.
+ If you want a greyscale image it is also sufficient to only specify
+ @c wxIMAGE_OPTION_TIFF_PHOTOMETRIC and set it to either
+ PHOTOMETRIC_MINISWHITE or PHOTOMETRIC_MINISBLACK. The other values
+ are taken care of.
+
+ @note
+ Be careful when combining the options @c wxIMAGE_OPTION_TIFF_SAMPLESPERPIXEL,
+ @c wxIMAGE_OPTION_TIFF_BITSPERSAMPLE, and @c wxIMAGE_OPTION_TIFF_PHOTOMETRIC.
+ While some measures are taken to prevent illegal combinations and/or
+ values, it is still easy to abuse them and come up with invalid
+ results in the form of either corrupted images or crashes.
@param name
The name of the option, case-insensitive.
@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_TIFF: 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_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_TIFF: 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).
static wxImage::RGBValue HSVtoRGB(const wxImage::HSVValue& hsv);
};
+
+class wxImageHistogram : public wxImageHistogramBase
+{
+public:
+ wxImageHistogram();
+
+ // get the key in the histogram for the given RGB values
+ static unsigned long MakeKey(unsigned char r,
+ unsigned char g,
+ unsigned char b);
+
+ // find first colour that is not used in the image and has higher
+ // RGB values than RGB(startR, startG, startB)
+ //
+ // returns true and puts this colour in r, g, b (each of which may be NULL)
+ // on success or returns false if there are no more free colours
+ bool FindFirstUnusedColour(unsigned char *r,
+ unsigned char *g,
+ unsigned char *b,
+ unsigned char startR = 1,
+ unsigned char startG = 0,
+ unsigned char startB = 0 ) const;
+};
+
/**
An instance of an empty image without an alpha channel.
*/
/**
Initializes all available image handlers.
- This function call wxImage::AddHandler() for all the available image
+ This function calls wxImage::AddHandler() for all the available image
handlers (see @ref image_handlers for the full list). Calling it is the
simplest way to initialize wxImage but it creates and registers even the
handlers your program may not use. If you want to avoid the overhead of
projects / wxWidgets.git / blobdiff