interface/image.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        image.h
   3 // Purpose:     interface of wxImageHandler
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows license
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /**
  10     @class wxImageHandler
  11     @wxheader{image.h}
  12
  13     This is the base class for implementing image file loading/saving, and image
  14     creation from data.
  15     It is used within wxImage and is not normally seen by the application.
  16
  17     If you wish to extend the capabilities of wxImage, derive a class from
  18     wxImageHandler
  19     and add the handler using wxImage::AddHandler in your
  20     application initialisation.
  21
  22     @library{wxcore}
  23     @category{FIXME}
  24
  25     @see wxImage, wxInitAllImageHandlers()
  26 */
  27 class wxImageHandler : public wxObject
  28 {
  29 public:
  30     /**
  31         Default constructor. In your own default constructor, initialise the members
  32         m_name, m_extension and m_type.
  33     */
  34     wxImageHandler();
  35
  36     /**
  37         Destroys the wxImageHandler object.
  38     */
  39     ~wxImageHandler();
  40
  41     /**
  42         Gets the file extension associated with this handler.
  43     */
  44     const wxString GetExtension() const;
  45
  46     /**
  47         If the image file contains more than one image and the image handler is capable
  48         of retrieving these individually, this function will return the number of
  49         available images.
  50
  51         @param stream
  52             Opened input stream for reading image data. Currently, the stream must
  53         support seeking.
  54
  55         @returns Number of available images. For most image handlers, this is 1
  56                  (exceptions are TIFF and ICO formats).
  57     */
  58     int GetImageCount(wxInputStream& stream);
  59
  60     /**
  61         Gets the MIME type associated with this handler.
  62     */
  63     const wxString GetMimeType() const;
  64
  65     /**
  66         Gets the name of this handler.
  67     */
  68     const wxString GetName() const;
  69
  70     /**
  71         Gets the image type associated with this handler.
  72     */
  73     long GetType() const;
  74
  75     /**
  76         Loads a image from a stream, putting the resulting data into @e image. If the
  77         image file contains
  78         more than one image and the image handler is capable of retrieving these
  79         individually, @e index
  80         indicates which image to read from the stream.
  81
  82         @param image
  83             The image object which is to be affected by this operation.
  84         @param stream
  85             Opened input stream for reading image data.
  86         @param verbose
  87             If set to @true, errors reported by the image handler will produce
  88         wxLogMessages.
  89         @param index
  90             The index of the image in the file (starting from zero).
  91
  92         @returns @true if the operation succeeded, @false otherwise.
  93
  94         @see wxImage::LoadFile, wxImage::SaveFile, SaveFile()
  95     */
  96     bool LoadFile(wxImage* image, wxInputStream& stream,
  97                   bool verbose = true, int index = 0);
  98
  99     /**
 100         Saves a image in the output stream.
 101
 102         @param image
 103             The image object which is to be affected by this operation.
 104         @param stream
 105             Opened output stream for writing the data.
 106
 107         @returns @true if the operation succeeded, @false otherwise.
 108
 109         @see wxImage::LoadFile, wxImage::SaveFile, LoadFile()
 110     */
 111     bool SaveFile(wxImage* image, wxOutputStream& stream);
 112
 113     /**
 114         Sets the handler extension.
 115
 116         @param extension
 117             Handler extension.
 118     */
 119     void SetExtension(const wxString& extension);
 120
 121     /**
 122         Sets the handler MIME type.
 123
 124         @param mimename
 125             Handler MIME type.
 126     */
 127     void SetMimeType(const wxString& mimetype);
 128
 129     /**
 130         Sets the handler name.
 131
 132         @param name
 133             Handler name.
 134     */
 135     void SetName(const wxString& name);
 136 };
 137
 138
 139
 140 /**
 141     @class wxImage
 142     @wxheader{image.h}
 143
 144     This class encapsulates a platform-independent image. An image can be created
 145     from data, or using wxBitmap::ConvertToImage. An image
 146     can be loaded from a file in a variety of formats, and is extensible to new
 147     formats
 148     via image format handlers. Functions are available to set and get image bits, so
 149     it can be used for basic image manipulation.
 150
 151     A wxImage cannot (currently) be drawn directly to a wxDC. Instead,
 152     a platform-specific wxBitmap object must be created from it using
 153     the wxBitmap::wxBitmap(wxImage,int depth) constructor.
 154     This bitmap can then
 155     be drawn in a device context, using wxDC::DrawBitmap.
 156
 157     One colour value of the image may be used as a mask colour which will lead to
 158     the automatic
 159     creation of a wxMask object associated to the bitmap object.
 160
 161     @library{wxcore}
 162     @category{gdi}
 163
 164     @see wxBitmap, wxInitAllImageHandlers()
 165 */
 166 class wxImage : public wxObject
 167 {
 168 public:
 169     //@{
 170     /**
 171         Creates an image from XPM data.
 172
 173         @param width
 174             Specifies the width of the image.
 175         @param height
 176             Specifies the height of the image.
 177         @param name
 178             Name of the file from which to load the image.
 179         @param stream
 180             Opened input stream from which to load the image. Currently, the stream
 181         must support seeking.
 182         @param type
 183             May be one of the following:
 184
 185
 186
 187
 188
 189
 190             wxBITMAP_TYPE_BMP
 191
 192
 193
 194
 195             Load a Windows bitmap file.
 196
 197
 198
 199
 200
 201             wxBITMAP_TYPE_GIF
 202
 203
 204
 205
 206             Load a GIF bitmap file.
 207
 208
 209
 210
 211
 212             wxBITMAP_TYPE_JPEG
 213
 214
 215
 216
 217             Load a JPEG bitmap file.
 218
 219
 220
 221
 222
 223             wxBITMAP_TYPE_PNG
 224
 225
 226
 227
 228             Load a PNG bitmap file.
 229
 230
 231
 232
 233
 234             wxBITMAP_TYPE_PCX
 235
 236
 237
 238
 239             Load a PCX bitmap file.
 240
 241
 242
 243
 244
 245             wxBITMAP_TYPE_PNM
 246
 247
 248
 249
 250             Load a PNM bitmap file.
 251
 252
 253
 254
 255
 256             wxBITMAP_TYPE_TIF
 257
 258
 259
 260
 261             Load a TIFF bitmap file.
 262
 263
 264
 265
 266
 267             wxBITMAP_TYPE_TGA
 268
 269
 270
 271
 272             Load a TGA bitmap file.
 273
 274
 275
 276
 277
 278             wxBITMAP_TYPE_XPM
 279
 280
 281
 282
 283             Load a XPM bitmap file.
 284
 285
 286
 287
 288
 289             wxBITMAP_TYPE_ICO
 290
 291
 292
 293
 294             Load a Windows icon file (ICO).
 295
 296
 297
 298
 299
 300             wxBITMAP_TYPE_CUR
 301
 302
 303
 304
 305             Load a Windows cursor file (CUR).
 306
 307
 308
 309
 310
 311             wxBITMAP_TYPE_ANI
 312
 313
 314
 315
 316             Load a Windows animated cursor file (ANI).
 317
 318
 319
 320
 321
 322             wxBITMAP_TYPE_ANY
 323
 324
 325
 326
 327             Will try to autodetect the format.
 328         @param mimetype
 329             MIME type string (for example 'image/jpeg')
 330         @param index
 331             Index of the image to load in the case that the image file contains
 332         multiple images.
 333             This is only used by GIF, ICO and TIFF handlers. The default value (-1)
 334         means
 335             "choose the default image" and is interpreted as the first image (index=0)
 336         by
 337             the GIF and TIFF handler and as the largest and most colourful one by the
 338         ICO handler.
 339         @param xpmData
 340             A pointer to XPM image data.
 341
 342         @remarks Depending on how wxWidgets has been configured, not all formats
 343                  may be available.
 344
 345         @see LoadFile()
 346     */
 347     wxImage();
 348     wxImage(const wxImage& image);
 349     wxImage(const wxBitmap& bitmap);
 350     wxImage(int width, int height, bool clear = true);
 351     wxImage(int width, int height, unsigned char* data,
 352             bool static_data = false);
 353     wxImage(const wxString& name, long type = wxBITMAP_TYPE_ANY,
 354             int index = -1);
 355     wxImage(const wxString& name, const wxString& mimetype,
 356             int index = -1);
 357     wxImage(wxInputStream& stream, long type = wxBITMAP_TYPE_ANY,
 358             int index = -1);
 359     wxImage(wxInputStream& stream, const wxString& mimetype,
 360             int index = -1);
 361     wxImage(const char* const* xpmData);
 362     //@}
 363
 364     /**
 365         Destructor.
 366         See @ref overview_refcountdestruct "reference-counted object destruction" for
 367         more info.
 368     */
 369     ~wxImage();
 370
 371     //@{
 372     /**
 373         returns @true if the current image handlers can read this file
 374     */
 375     static void AddHandler(wxImageHandler* handler);
 376     See also bool CanRead(const wxString& filename);
 377     //@}
 378
 379     /**
 380         Blurs the image in both horizontal and vertical directions by the specified
 381         pixel
 382         @e blurRadius. This should not be used when using a single mask colour
 383         for transparency.
 384
 385         @see @ref horzblur() BlurHorizontal, @ref vertblur() BlurVertical
 386     */
 387     wxImage Blur(int blurRadius);
 388
 389     /**
 390         Blurs the image in the horizontal direction only. This should not be used
 391         when using a single mask colour for transparency.
 392
 393         @see Blur(), @ref vertblur() BlurVertical
 394     */
 395     wxImage BlurHorizontal(int blurRadius);
 396
 397     /**
 398         Blurs the image in the vertical direction only. This should not be used
 399         when using a single mask colour for transparency.
 400
 401         @see Blur(), @ref horzblur() BlurHorizontal
 402     */
 403     wxImage BlurVertical(int blurRadius);
 404
 405     /**
 406         Deletes all image handlers.
 407         This function is called by wxWidgets on exit.
 408     */
 409     static void CleanUpHandlers();
 410
 411     /**
 412         Computes the histogram of the image. @a histogram is a reference to
 413         wxImageHistogram object. wxImageHistogram is a specialization of
 414         wxHashMap "template" and is defined as follows:
 415
 416         @returns Returns number of colours in the histogram.
 417     */
 418     unsigned long ComputeHistogram(wxImageHistogram& histogram) const;
 419
 420     /**
 421         If the image has alpha channel, this method converts it to mask. All pixels
 422         with alpha value less than @a threshold are replaced with mask colour
 423         and the alpha channel is removed. Mask colour is chosen automatically using
 424         FindFirstUnusedColour().
 425         If the image image doesn't have alpha channel,
 426         ConvertAlphaToMask does nothing.
 427
 428         @returns @false if FindFirstUnusedColour returns @false, @true otherwise.
 429     */
 430     bool ConvertAlphaToMask(unsigned char threshold = 128);
 431
 432     /**
 433         Deprecated, use equivalent @ref wxBitmap::ctor "wxBitmap constructor"
 434         (which takes wxImage and depth as its arguments) instead.
 435     */
 436     wxBitmap ConvertToBitmap() const;
 437
 438     /**
 439         Returns a greyscale version of the image. The returned image uses the luminance
 440         component of the original to calculate the greyscale. Defaults to using
 441         ITU-T BT.601 when converting to YUV, where every pixel equals
 442         (R * @e lr) + (G * @e lg) + (B * @e lb).
 443     */
 444     wxImage ConvertToGreyscale(double lr = 0.299, double lg = 0.587,
 445                                double lb = 0.114) const;
 446
 447     /**
 448         Returns monochromatic version of the image. The returned image has white
 449         colour where the original has @e (r,g,b) colour and black colour
 450         everywhere else.
 451     */
 452     wxImage ConvertToMono(unsigned char r, unsigned char g,
 453                           unsigned char b) const;
 454
 455     /**
 456         Returns an identical copy of the image.
 457     */
 458     wxImage Copy() const;
 459
 460     /**
 461         Creates a fresh image.  If @a clear is @true, the new image will be initialized
 462         to black.
 463         Otherwise, the image data will be uninitialized.
 464
 465         @param width
 466             The width of the image in pixels.
 467         @param height
 468             The height of the image in pixels.
 469
 470         @returns @true if the call succeeded, @false otherwise.
 471     */
 472     bool Create(int width, int height, bool clear = true);
 473
 474     /**
 475         Destroys the image data.
 476     */
 477     void Destroy();
 478
 479     /**
 480         @param r,g,b
 481             Pointers to variables to save the colour.
 482         @param startR,startG,startB
 483             Initial values of the colour. Returned colour
 484             will have RGB values equal to or greater than these.
 485
 486         @returns Returns @false if there is no unused colour left, @true on success.
 487     */
 488     bool FindFirstUnusedColour(unsigned char* r, unsigned char* g,
 489                                unsigned char* b,
 490                                unsigned char startR = 1,
 491                                unsigned char startG = 0,
 492                                unsigned char startB = 0);
 493
 494     //@{
 495     /**
 496         Finds the handler associated with the given MIME type.
 497
 498         @param name
 499             The handler name.
 500         @param extension
 501             The file extension, such as "bmp".
 502         @param imageType
 503             The image type, such as wxBITMAP_TYPE_BMP.
 504         @param mimetype
 505             MIME type.
 506
 507         @returns A pointer to the handler if found, @NULL otherwise.
 508
 509         @see wxImageHandler
 510     */
 511     static wxImageHandler* FindHandler(const wxString& name);
 512     static wxImageHandler* FindHandler(const wxString& extension,
 513                                        long imageType);
 514     static wxImageHandler* FindHandler(long imageType);
 515     static wxImageHandler* FindHandlerMime(const wxString& mimetype);
 516     //@}
 517
 518     //@{
 519     /**
 520         Returns pointer to the array storing the alpha values for this image. This
 521         pointer is @NULL for the images without the alpha channel. If the image
 522         does have it, this pointer may be used to directly manipulate the alpha values
 523         which are stored as the @ref getdata() RGB ones.
 524     */
 525     unsigned char GetAlpha(int x, int y) const;
 526     const unsigned char * GetAlpha() const;
 527     //@}
 528
 529     /**
 530         Returns the blue intensity at the given coordinate.
 531     */
 532     unsigned char GetBlue(int x, int y) const;
 533
 534     /**
 535         Returns the image data as an array. This is most often used when doing
 536         direct image manipulation. The return value points to an array of
 537         characters in RGBRGBRGB... format in the top-to-bottom, left-to-right
 538         order, that is the first RGB triplet corresponds to the pixel first pixel of
 539         the first row, the second one --- to the second pixel of the first row and so
 540         on until the end of the first row, with second row following after it and so
 541         on.
 542         You should not delete the returned pointer nor pass it to
 543         SetData().
 544     */
 545     unsigned char* GetData() const;
 546
 547     /**
 548         Returns the green intensity at the given coordinate.
 549     */
 550     unsigned char GetGreen(int x, int y) const;
 551
 552     /**
 553         Returns the static list of image format handlers.
 554
 555         @see wxImageHandler
 556     */
 557     static wxList GetHandlers();
 558
 559     /**
 560         Gets the height of the image in pixels.
 561     */
 562     int GetHeight() const;
 563
 564     //@{
 565     /**
 566         If the image file contains more than one image and the image handler is capable
 567         of retrieving these individually, this function will return the number of
 568         available images.
 569
 570         @param name
 571             Name of the file to query.
 572         @param stream
 573             Opened input stream with image data. Currently, the stream must support
 574         seeking.
 575         @param type
 576             May be one of the following:
 577
 578
 579
 580
 581
 582
 583             wxBITMAP_TYPE_BMP
 584
 585
 586
 587
 588             Load a Windows bitmap file.
 589
 590
 591
 592
 593
 594             wxBITMAP_TYPE_GIF
 595
 596
 597
 598
 599             Load a GIF bitmap file.
 600
 601
 602
 603
 604
 605             wxBITMAP_TYPE_JPEG
 606
 607
 608
 609
 610             Load a JPEG bitmap file.
 611
 612
 613
 614
 615
 616             wxBITMAP_TYPE_PNG
 617
 618
 619
 620
 621             Load a PNG bitmap file.
 622
 623
 624
 625
 626
 627             wxBITMAP_TYPE_PCX
 628
 629
 630
 631
 632             Load a PCX bitmap file.
 633
 634
 635
 636
 637
 638             wxBITMAP_TYPE_PNM
 639
 640
 641
 642
 643             Load a PNM bitmap file.
 644
 645
 646
 647
 648
 649             wxBITMAP_TYPE_TIF
 650
 651
 652
 653
 654             Load a TIFF bitmap file.
 655
 656
 657
 658
 659
 660             wxBITMAP_TYPE_XPM
 661
 662
 663
 664
 665             Load a XPM bitmap file.
 666
 667
 668
 669
 670
 671             wxBITMAP_TYPE_ICO
 672
 673
 674
 675
 676             Load a Windows icon file (ICO).
 677
 678
 679
 680
 681
 682             wxBITMAP_TYPE_CUR
 683
 684
 685
 686
 687             Load a Windows cursor file (CUR).
 688
 689
 690
 691
 692
 693             wxBITMAP_TYPE_ANI
 694
 695
 696
 697
 698             Load a Windows animated cursor file (ANI).
 699
 700
 701
 702
 703
 704             wxBITMAP_TYPE_ANY
 705
 706
 707
 708
 709             Will try to autodetect the format.
 710
 711         @returns Number of available images. For most image handlers, this is 1
 712                  (exceptions are TIFF and ICO formats).
 713     */
 714     static int GetImageCount(const wxString& filename,
 715                              long type = wxBITMAP_TYPE_ANY);
 716     static int GetImageCount(wxInputStream& stream,
 717                              long type = wxBITMAP_TYPE_ANY);
 718     //@}
 719
 720     /**
 721         Iterates all registered wxImageHandler objects, and returns a string containing
 722         file extension masks
 723         suitable for passing to file open/save dialog boxes.
 724
 725         @returns The format of the returned string is
 726                  "(*.ext1;*.ext2)|*.ext1;*.ext2".
 727
 728         @see wxImageHandler
 729     */
 730     static wxString GetImageExtWildcard();
 731
 732     /**
 733         Gets the blue value of the mask colour.
 734     */
 735     unsigned char GetMaskBlue() const;
 736
 737     /**
 738         Gets the green value of the mask colour.
 739     */
 740     unsigned char GetMaskGreen() const;
 741
 742     /**
 743         Gets the red value of the mask colour.
 744     */
 745     unsigned char GetMaskRed() const;
 746
 747     /**
 748         Gets a user-defined option. The function is case-insensitive to @e name.
 749         For example, when saving as a JPEG file, the option @b quality is
 750         used, which is a number between 0 and 100 (0 is terrible, 100 is very good).
 751
 752         @see SetOption(), GetOptionInt(), HasOption()
 753     */
 754     wxString GetOption(const wxString& name) const;
 755
 756     /**
 757         Gets a user-defined option as an integer. The function is case-insensitive to
 758         @e name.
 759         If the given option is not present, the function returns 0. Use
 760         HasOption() is 0 is a possibly valid value
 761         for the option.
 762         Options for wxPNGHandler
 763
 764         wxIMAGE_OPTION_PNG_FORMAT
 765
 766         Format for saving a PNG file.
 767
 768         wxIMAGE_OPTION_PNG_BITDEPTH
 769
 770         Bit depth for every channel (R/G/B/A).
 771
 772         Supported values for wxIMAGE_OPTION_PNG_FORMAT:
 773
 774         wxPNG_TYPE_COLOUR
 775
 776         Stores RGB image.
 777
 778         wxPNG_TYPE_GREY
 779
 780         Stores grey image, converts from RGB.
 781
 782         wxPNG_TYPE_GREY_RED
 783
 784         Stores grey image, uses red value as grey.
 785
 786         @see SetOption(), GetOption()
 787     */
 788     int GetOptionInt(const wxString& name) const;
 789
 790     /**
 791         Get the current mask colour or find a suitable unused colour that could be
 792         used as a mask colour. Returns @true if the image currently has a mask.
 793     */
 794     bool GetOrFindMaskColour(unsigned char r, unsigned char g,
 795                              unsigned char b) const;
 796
 797     /**
 798         Returns the palette associated with the image. Currently the palette is only
 799         used when converting to wxBitmap under Windows. Some of the wxImage handlers
 800         have been modified to set the palette if one exists in the image file (usually
 801         256 or less colour images in GIF or PNG format).
 802     */
 803     const wxPalette GetPalette() const;
 804
 805     /**
 806         Returns the red intensity at the given coordinate.
 807     */
 808     unsigned char GetRed(int x, int y) const;
 809
 810     /**
 811         Returns a sub image of the current one as long as the rect belongs entirely to
 812         the image.
 813     */
 814     wxImage GetSubImage(const wxRect& rect) const;
 815
 816     /**
 817         Gets the width of the image in pixels.
 818
 819         @see GetHeight()
 820     */
 821     int GetWidth() const;
 822
 823     /**
 824         Constructor for HSVValue, an object that contains values for hue, saturation
 825         and value which
 826         represent the value of a color. It is used by HSVtoRGB()
 827         and RGBtoHSV(), which
 828         converts between HSV color space and RGB color space.
 829     */
 830     HSVValue(double h = 0.0, double s = 0.0, double v = 0.0);
 831
 832     /**
 833         Converts a color in HSV color space to RGB color space.
 834     */
 835 #define wxImage::RGBValue HSVtoRGB(const HSVValue& hsv)     /* implementation is private */
 836
 837     /**
 838         Returns @true if this image has alpha channel, @false otherwise.
 839
 840         @see GetAlpha(), SetAlpha()
 841     */
 842     bool HasAlpha() const;
 843
 844     /**
 845         Returns @true if there is a mask active, @false otherwise.
 846     */
 847     bool HasMask() const;
 848
 849     /**
 850         Returns @true if the given option is present. The function is case-insensitive
 851         to @e name.
 852
 853         @see SetOption(), GetOption(), GetOptionInt()
 854     */
 855     bool HasOption(const wxString& name) const;
 856
 857     /**
 858         Initializes the image alpha channel data. It is an error to call it
 859         if the image already has alpha data. If it doesn't, alpha data will be
 860         by default initialized to all pixels being fully opaque. But if the image has a
 861         a mask colour, all mask pixels will be completely transparent.
 862     */
 863     void InitAlpha();
 864
 865     /**
 866         Internal use only. Adds standard image format handlers. It only install BMP
 867         for the time being, which is used by wxBitmap.
 868         This function is called by wxWidgets on startup, and shouldn't be called by
 869         the user.
 870
 871         @see wxImageHandler, wxInitAllImageHandlers(), wxQuantize
 872     */
 873     static void InitStandardHandlers();
 874
 875     /**
 876         Adds a handler at the start of the static list of format handlers.
 877
 878         @param handler
 879             A new image format handler object. There is usually only one instance
 880             of a given handler class in an application session.
 881
 882         @see wxImageHandler
 883     */
 884     static void InsertHandler(wxImageHandler* handler);
 885
 886     /**
 887         Returns @true if image data is present.
 888     */
 889     bool IsOk() const;
 890
 891     /**
 892         Returns @true if the given pixel is transparent, i.e. either has the mask
 893         colour if this image has a mask or if this image has alpha channel and alpha
 894         value of this pixel is strictly less than @e threshold.
 895     */
 896     bool IsTransparent(int x, int y, unsigned char threshold = 128) const;
 897
 898     //@{
 899     /**
 900         Loads an image from an input stream.
 901
 902         @param name
 903             Name of the file from which to load the image.
 904         @param stream
 905             Opened input stream from which to load the image. Currently, the stream
 906         must support seeking.
 907         @param type
 908             One of the following values:
 909
 910
 911
 912
 913
 914
 915             wxBITMAP_TYPE_BMP
 916
 917
 918
 919
 920             Load a Windows image file.
 921
 922
 923
 924
 925
 926             wxBITMAP_TYPE_GIF
 927
 928
 929
 930
 931             Load a GIF image file.
 932
 933
 934
 935
 936
 937             wxBITMAP_TYPE_JPEG
 938
 939
 940
 941
 942             Load a JPEG image file.
 943
 944
 945
 946
 947
 948             wxBITMAP_TYPE_PCX
 949
 950
 951
 952
 953             Load a PCX image file.
 954
 955
 956
 957
 958
 959             wxBITMAP_TYPE_PNG
 960
 961
 962
 963
 964             Load a PNG image file.
 965
 966
 967
 968
 969
 970             wxBITMAP_TYPE_PNM
 971
 972
 973
 974
 975             Load a PNM image file.
 976
 977
 978
 979
 980
 981             wxBITMAP_TYPE_TIF
 982
 983
 984
 985
 986             Load a TIFF image file.
 987
 988
 989
 990
 991
 992             wxBITMAP_TYPE_XPM
 993
 994
 995
 996
 997             Load a XPM image file.
 998
 999
1000
1001
1002
1003             wxBITMAP_TYPE_ICO
1004
1005
1006
1007
1008             Load a Windows icon file (ICO).
1009
1010
1011
1012
1013
1014             wxBITMAP_TYPE_CUR
1015
1016
1017
1018
1019             Load a Windows cursor file (CUR).
1020
1021
1022
1023
1024
1025             wxBITMAP_TYPE_ANI
1026
1027
1028
1029
1030             Load a Windows animated cursor file (ANI).
1031
1032
1033
1034
1035
1036             wxBITMAP_TYPE_ANY
1037
1038
1039
1040
1041             Will try to autodetect the format.
1042         @param mimetype
1043             MIME type string (for example 'image/jpeg')
1044         @param index
1045             Index of the image to load in the case that the image file contains
1046         multiple images.
1047             This is only used by GIF, ICO and TIFF handlers. The default value (-1)
1048         means
1049             "choose the default image" and is interpreted as the first image (index=0)
1050         by
1051             the GIF and TIFF handler and as the largest and most colourful one by the
1052         ICO handler.
1053
1054         @returns @true if the operation succeeded, @false otherwise. If the
1055                  optional index parameter is out of range, @false is
1056                  returned and a call to wxLogError() takes place.
1057
1058         @remarks Depending on how wxWidgets has been configured, not all formats
1059                  may be available.
1060
1061         @see SaveFile()
1062     */
1063     bool LoadFile(const wxString& name,
1064                   long type = wxBITMAP_TYPE_ANY,
1065                   int index = -1);
1066     bool LoadFile(const wxString& name, const wxString& mimetype,
1067                   int index = -1);
1068     bool LoadFile(wxInputStream& stream, long type,
1069                   int index = -1);
1070     bool LoadFile(wxInputStream& stream,
1071                   const wxString& mimetype,
1072                   int index = -1);
1073     //@}
1074
1075     /**
1076         Returns a mirrored copy of the image. The parameter @e horizontally
1077         indicates the orientation.
1078     */
1079     wxImage Mirror(bool horizontally = true) const;
1080
1081     /**
1082         Copy the data of the given @a image to the specified position in this image.
1083     */
1084     void Paste(const wxImage& image, int x, int y);
1085
1086     /**
1087         Constructor for RGBValue, an object that contains values for red, green and
1088         blue which
1089         represent the value of a color. It is used by HSVtoRGB()
1090         and RGBtoHSV(), which
1091         converts between HSV color space and RGB color space.
1092     */
1093     RGBValue(unsigned char r = 0, unsigned char g = 0,
1094              unsigned char b = 0);
1095
1096     /**
1097         Converts a color in RGB color space to HSV color space.
1098     */
1099 #define wxImage::HSVValue RGBtoHSV(const RGBValue& rgb)     /* implementation is private */
1100
1101     /**
1102         Finds the handler with the given name, and removes it. The handler
1103         is not deleted.
1104
1105         @param name
1106             The handler name.
1107
1108         @returns @true if the handler was found and removed, @false otherwise.
1109
1110         @see wxImageHandler
1111     */
1112     static bool RemoveHandler(const wxString& name);
1113
1114     /**
1115         Replaces the colour specified by @e r1,g1,b1 by the colour @e r2,g2,b2.
1116     */
1117     void Replace(unsigned char r1, unsigned char g1,
1118                  unsigned char b1, unsigned char r2,
1119                  unsigned char g2, unsigned char b2);
1120
1121     /**
1122         Changes the size of the image in-place by scaling it: after a call to this
1123         function,
1124         the image will have the given width and height.
1125         For a description of the @a quality parameter, see the Scale() function.
1126         Returns the (modified) image itself.
1127
1128         @see Scale()
1129     */
1130     wxImage Rescale(int width, int height,
1131                     int quality = wxIMAGE_QUALITY_NORMAL);
1132
1133     /**
1134         Changes the size of the image in-place without scaling it by adding either a
1135         border
1136         with the given colour or cropping as necessary. The image is pasted into a new
1137         image with the given @a size and background colour at the position @e pos
1138         relative to the upper left of the new image. If @a red = green = blue = -1
1139         then use either the  current mask colour if set or find, use, and set a
1140         suitable mask colour for any newly exposed areas.
1141         Returns the (modified) image itself.
1142
1143         @see Size()
1144     */
1145     wxImage Resize(const wxSize& size, const wxPoint pos,
1146                    int red = -1, int green = -1,
1147                    int blue = -1);
1148
1149     /**
1150         Rotates the image about the given point, by @a angle radians. Passing @true
1151         to @a interpolating results in better image quality, but is slower. If the
1152         image has a mask, then the mask colour is used for the uncovered pixels in the
1153         rotated image background. Else, black (rgb 0, 0, 0) will be used.
1154         Returns the rotated image, leaving this image intact.
1155     */
1156     wxImage Rotate(double angle, const wxPoint& rotationCentre,
1157                    bool interpolating = true,
1158                    wxPoint* offsetAfterRotation = NULL);
1159
1160     /**
1161         Returns a copy of the image rotated 90 degrees in the direction
1162         indicated by @e clockwise.
1163     */
1164     wxImage Rotate90(bool clockwise = true) const;
1165
1166     /**
1167         Rotates the hue of each pixel in the image by @e angle, which is a double in
1168         the range of -1.0 to +1.0, where -1.0 corresponds to -360 degrees and +1.0
1169         corresponds
1170         to +360 degrees.
1171     */
1172     void RotateHue(double angle);
1173
1174     //@{
1175     /**
1176         Saves an image in the given stream.
1177
1178         @param name
1179             Name of the file to save the image to.
1180         @param stream
1181             Opened output stream to save the image to.
1182         @param type
1183             Currently these types can be used:
1184
1185
1186
1187
1188
1189
1190             wxBITMAP_TYPE_BMP
1191
1192
1193
1194
1195             Save a BMP image file.
1196
1197
1198
1199
1200
1201             wxBITMAP_TYPE_JPEG
1202
1203
1204
1205
1206             Save a JPEG image file.
1207
1208
1209
1210
1211
1212             wxBITMAP_TYPE_PNG
1213
1214
1215
1216
1217             Save a PNG image file.
1218
1219
1220
1221
1222
1223             wxBITMAP_TYPE_PCX
1224
1225
1226
1227
1228             Save a PCX image file (tries to save as 8-bit if possible, falls back to
1229         24-bit otherwise).
1230
1231
1232
1233
1234
1235             wxBITMAP_TYPE_PNM
1236
1237
1238
1239
1240             Save a PNM image file (as raw RGB always).
1241
1242
1243
1244
1245
1246             wxBITMAP_TYPE_TIFF
1247
1248
1249
1250
1251             Save a TIFF image file.
1252
1253
1254
1255
1256
1257             wxBITMAP_TYPE_XPM
1258
1259
1260
1261
1262             Save a XPM image file.
1263
1264
1265
1266
1267
1268             wxBITMAP_TYPE_ICO
1269
1270
1271
1272
1273             Save a Windows icon file (ICO) (the size may be up to 255 wide by 127 high.
1274         A single image is saved in 8 colors at the size supplied).
1275
1276
1277
1278
1279
1280             wxBITMAP_TYPE_CUR
1281
1282
1283
1284
1285             Save a Windows cursor file (CUR).
1286         @param mimetype
1287             MIME type.
1288
1289         @returns @true if the operation succeeded, @false otherwise.
1290
1291         @remarks Depending on how wxWidgets has been configured, not all formats
1292                  may be available.
1293
1294         @see LoadFile()
1295     */
1296     bool SaveFile(const wxString& name, int type) const;
1297     const bool SaveFile(const wxString& name,
1298                         const wxString& mimetype) const;
1299     const bool SaveFile(const wxString& name) const;
1300     const bool SaveFile(wxOutputStream& stream, int type) const;
1301     const bool SaveFile(wxOutputStream& stream,
1302                         const wxString& mimetype) const;
1303     //@}
1304
1305     /**
1306         Returns a scaled version of the image. This is also useful for
1307         scaling bitmaps in general as the only other way to scale bitmaps
1308         is to blit a wxMemoryDC into another wxMemoryDC.
1309         It should be noted that although using wxIMAGE_QUALITY_HIGH produces much nicer
1310         looking results it is a slower method.  Downsampling will use the box averaging
1311         method
1312         which seems to operate very fast.  If you are upsampling larger images using
1313         this method you will most likely notice that it is a bit slower and in extreme
1314         cases
1315         it will be quite substantially slower as the bicubic algorithm has to process a
1316         lot of
1317         data.
1318         It should also be noted that the high quality scaling may not work as expected
1319         when using a single mask colour for transparency, as the scaling will blur the
1320         image and will therefore remove the mask partially. Using the alpha channel
1321         will work.
1322         Example:
1323
1324         @param quality
1325             Determines what method to use for resampling the image.  Can be one of the
1326         following:
1327
1328
1329
1330
1331
1332
1333             wxIMAGE_QUALITY_NORMAL
1334
1335
1336
1337
1338             Uses the normal default scaling method of pixel replication
1339
1340
1341
1342
1343
1344             wxIMAGE_QUALITY_HIGH
1345
1346
1347
1348
1349             Uses bicubic and box averaging resampling methods for upsampling and
1350         downsampling respectively
1351
1352         @see Rescale()
1353     */
1354     wxImage Scale(int width, int height,
1355                   int quality = wxIMAGE_QUALITY_NORMAL) const;
1356
1357     //@{
1358     /**
1359         Sets the alpha value for the given pixel. This function should only be called
1360         if the image has alpha channel data, use HasAlpha() to
1361         check for this.
1362     */
1363     void SetAlpha(unsigned char* alpha = NULL,
1364                   bool static_data = false);
1365     void SetAlpha(int x, int y, unsigned char alpha);
1366     //@}
1367
1368     /**
1369         Sets the image data without performing checks. The data given must have
1370         the size (width*height*3) or results will be unexpected. Don't use this
1371         method if you aren't sure you know what you are doing.
1372         The data must have been allocated with @c malloc(), @b NOT with
1373         @c operator new.
1374         After this call the pointer to the data is owned by the wxImage object,
1375         that will be responsible for deleting it.
1376         Do not pass to this function a pointer obtained through
1377         GetData().
1378     */
1379     void SetData(unsigned char* data);
1380
1381     /**
1382         Specifies whether there is a mask or not. The area of the mask is determined by
1383         the current mask colour.
1384     */
1385     void SetMask(bool hasMask = true);
1386
1387     /**
1388         Sets the mask colour for this image (and tells the image to use the mask).
1389     */
1390     void SetMaskColour(unsigned char red, unsigned char green,
1391                        unsigned char blue);
1392
1393     /**
1394         @param mask
1395             The mask image to extract mask shape from. Must have same dimensions as the
1396         image.
1397         @param mr,mg,mb
1398             RGB value of pixels in mask that will be used to create the mask.
1399
1400         @returns Returns @false if mask does not have same dimensions as the image
1401                  or if there is no unused colour left. Returns @true if
1402                  the mask was successfully applied.
1403     */
1404     bool SetMaskFromImage(const wxImage& mask, unsigned char mr,
1405                           unsigned char mg,
1406                           unsigned char mb);
1407
1408     //@{
1409     /**
1410         Sets a user-defined option. The function is case-insensitive to @e name.
1411         For example, when saving as a JPEG file, the option @b quality is
1412         used, which is a number between 0 and 100 (0 is terrible, 100 is very good).
1413
1414         @see GetOption(), GetOptionInt(), HasOption()
1415     */
1416     void SetOption(const wxString& name, const wxString& value);
1417     void SetOption(const wxString& name, int value);
1418     //@}
1419
1420     /**
1421         Associates a palette with the image. The palette may be used when converting
1422         wxImage to wxBitmap (MSW only at present) or in file save operations (none as
1423         yet).
1424     */
1425     void SetPalette(const wxPalette& palette);
1426
1427     /**
1428         Sets the colour of the pixels within the given rectangle. This routine performs
1429         bounds-checks for the coordinate so it can be considered a safe way to
1430         manipulate the
1431         data.
1432     */
1433     void SetRGB(wxRect& rect, unsigned char red,
1434                 unsigned char green,
1435                 unsigned char blue);
1436
1437     /**
1438         Returns a resized version of this image without scaling it by adding either a
1439         border
1440         with the given colour or cropping as necessary. The image is pasted into a new
1441         image with the given @a size and background colour at the position @e pos
1442         relative to the upper left of the new image. If @a red = green = blue = -1
1443         then the areas of the larger image not covered by this image are made
1444         transparent by filling them with the image mask colour (which will be allocated
1445         automatically if it isn't currently set). Otherwise, the areas will be filled
1446         with the colour with the specified RGB components.
1447
1448         @see Resize()
1449     */
1450     wxImage Size(const wxSize& size, const wxPoint pos, int red = -1,
1451                  int green = -1, int blue = -1) const;
1452
1453     /**
1454         Assignment operator, using @ref overview_trefcount "reference counting".
1455
1456         @param image
1457             Image to assign.
1458
1459         @returns Returns 'this' object.
1460     */
1461     wxImage operator =(const wxImage& image);
1462 };
1463
1464
1465
1466 // ============================================================================
1467 // Global functions/macros
1468 // ============================================================================
1469
1470 /**
1471     Initializes all available image handlers. For a list of available handlers,
1472     see wxImage.
1473
1474     @see wxImage, wxImageHandler
1475 */
1476 void wxInitAllImageHandlers();
1477