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iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) IIIImmmmaaaaggggeeee FFFFoooorrrrmmmmaaaatttt LLLLiiiibbbbrrrraaaarrrryyyy CCCC++++++++ RRRReeeeffffeeeerrrreeeennnncccceeee MMMMaaaannnnuuuuaaaallll iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) NNNNAAAAMMMMEEEE iiiiffffllllFFFFoooorrrrmmmmaaaatttt - abstraction of an image file format IIIINNNNHHHHEEEERRRRIIIITTTTSSSS FFFFRRRROOOOMMMM This is a base class with no inheritance. HHHHEEEEAAAADDDDEEEERRRR FFFFIIIILLLLEEEE #include <il/iflFormat.h> CCCCLLLLAAAASSSSSSSS DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN An iflFormat object represents a description of the capabilities of a particular image file format. Usually there exists at most one such object per file format in a running program; functions that return iflFormat*s (such as iiiiffffllllFFFFiiiilllleeee::::::::ggggeeeettttFFFFoooorrrrmmmmaaaatttt()) generally return a pointer to the single static object of the appropriate subclass of iflFormat. iflFormat is an abstract base class; every iflFormat object is actually an object of a file-format-specific subclass such as iflTIFFFormat. FFFFoooorrrrmmmmaaaatttt llllooooooookkkkuuuupppp ffffuuuunnnnccccttttiiiioooonnnnssss An IFL application can use the ffffiiiinnnnddddNNNNeeeexxxxtttt(), ffffiiiinnnnddddBBBByyyyMMMMaaaaggggiiiicccc(), ffffiiiinnnnddddBBBByyyyFFFFoooorrrrmmmmaaaattttNNNNaaaammmmeeee() and ffffiiiinnnnddddBBBByyyyFFFFiiiilllleeeeNNNNaaaammmmeeee() functions to step through all supported file formats, or to look up an image file format by format name, file name, or file magic number. The return value of each of these functions is an iflFormat* pointing to the single static object of the appropriate subclass of iflFormat (such as iflTIFFFormat). SSSSuuuuppppppppoooorrrrtttteeeedddd aaaattttttttrrrriiiibbbbuuuutttteeee qqqquuuueeeerrrriiiieeeessss These ...IsSupported() functions tell whether a given value of a given image attribute is supported by the image file format. Note that certain combinations of parameters might not be supported, even if each parameter is individually supported; thus these functions cannot give a definitive positive answer for support of a set of parameters, though they may give a definitive negative answer. PPPPrrrreeeeffffeeeerrrrrrrreeeedddd aaaattttttttrrrriiiibbbbuuuutttteeee qqqquuuueeeerrrriiiieeeessss The getPreferred...() virtual member functions return the image file format's "preferred" value for the respective attributes. The returned value must be one of the supported values for that parameter, as reported by the corresponding "isSupported" method. DDDDEEEERRRRIIIIVVVVIIIINNNNGGGG SSSSUUUUBBBBCCCCLLLLAAAASSSSSSSSEEEESSSS The derived class must define all of iflFormat's pure virtuals: aaaacccccccceeeessssssssMMMMooooddddeeeeIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(), ttttyyyyppppeeeeIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(), oooorrrrddddeeeerrrrIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(), oooorrrriiiieeeennnnttttaaaattttiiiioooonnnnIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(), ccccoooolllloooorrrrMMMMooooddddeeeellllIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(), ccccoooommmmpppprrrreeeessssssssiiiioooonnnnIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(), ssssiiiizzzzeeeeIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(), ppppaaaaggggiiiinnnnggggIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(), ppppaaaaggggeeeeSSSSiiiizzzzeeeeIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(), rrrraaaannnnddddoooommmmAAAAcccccccceeeessssssssRRRReeeeaaaaddddIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(), rrrraaaannnnddddoooommmmAAAAcccccccceeeessssssssWWWWrrrriiiitttteeeeIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(), ggggeeeettttPPPPrrrreeeeffffeeeerrrrrrrreeeeddddTTTTyyyyppppeeee(), ggggeeeettttPPPPrrrreeeeffffeeeerrrrrrrreeeeddddOOOOrrrrddddeeeerrrr(), ggggeeeettttPPPPrrrreeeeffffeeeerrrrrrrreeeeddddOOOOrrrriiiieeeennnnttttaaaattttiiiioooonnnn(), ggggeeeettttPPPPrrrreeeeffffeeeerrrrrrrreeeeddddCCCCoooolllloooorrrrMMMMooooddddeeeellll(), PPPPaaaaggggeeee 1111 iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) IIIImmmmaaaaggggeeee FFFFoooorrrrmmmmaaaatttt LLLLiiiibbbbrrrraaaarrrryyyy CCCC++++++++ RRRReeeeffffeeeerrrreeeennnncccceeee MMMMaaaannnnuuuuaaaallll iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) ggggeeeettttPPPPrrrreeeeffffeeeerrrrrrrreeeeddddCCCCoooommmmpppprrrreeeessssssssiiiioooonnnn(), ggggeeeettttPPPPrrrreeeeffffeeeerrrrrrrreeeeddddPPPPaaaaggggeeeeSSSSiiiizzzzeeee() and nnnneeeewwwwffffiiiilllleeeeoooobbbbjjjj(). This will fully characterize the format, and, via nnnneeeewwwwffffiiiilllleeeeoooobbbbjjjj(), will tell iiiiffffllllFFFFiiiilllleeee::::::::ooooppppeeeennnn() how to create an iflFile of this format's type. Each image file format subclass format is expected to declare a single static object of its derived type. The base class constructor invoked automatically when the DSO is opened (becuase of the static object declaration) will put the derived format on the global format list as part of its initialization. If you instal ifl_dev.sw.gifts then you can check out the source code provided in /usr/share/src/ifl for more examples of deriving from iflFormat. CCCCLLLLAAAASSSSSSSS MMMMEEEEMMMMBBBBEEEERRRR FFFFUUUUNNNNCCCCTTTTIIIIOOOONNNN SSSSUUUUMMMMMMMMAAAARRRRYYYY CCCCoooonnnnssssttttrrrruuuuccccttttoooorrrr iflFormat(const char* formatName) _p_r_o_t_e_c_t_e_d FFFFoooorrrrmmmmaaaatttt llllooooooookkkkuuuupppp static iflFormat* findNext(int& index, int openDSOifNecessary = TRUE) static iflFormat* findByMagic(int fd, int openDSOifNecessary = TRUE) static iflFormat* findByFormatName(const char* formatName, int openDSOifNecessary = TRUE) static iflFormat* findByFileName(const char* fileName, int noMatchRule = FALSE, int openDSOifNecessary = TRUE) AAAAttttttttrrrriiiibbbbuuuutttteeee qqqquuuueeeerrrriiiieeeessss const char* getName() const char* getDefaultSuffix() const char* getDescription() AAAAttttttttrrrriiiibbbbuuuutttteeee ssssuuuuppppppppoooorrrrtttt qqqquuuueeeerrrriiiieeeessss int accessModeIsSupported(int mode) virtual int typeIsSupported(iflDataType type) virtual int orderIsSupported(iflOrder order) virtual int orientationIsSupported(iflOrientation orientation) virtual int colorModelIsSupported(iflColorModel colormodel) virtual int compressionIsSupported(iflCompression compression) virtual int sizeIsSupported(int width, int height, int z, int c, iflOrientation orientation) virtual int pagingIsSupported() virtual int pageSizeIsSupported(int iWidth, int iHeight, int iz, int ic, int pWidth, int pHeight, int pz, int pc, iflOrientation orientation) virtual int randomAccessReadIsSupported() virtual int randomAccessWriteIsSupported() PPPPaaaaggggeeee 2222 iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) IIIImmmmaaaaggggeeee FFFFoooorrrrmmmmaaaatttt LLLLiiiibbbbrrrraaaarrrryyyy CCCC++++++++ RRRReeeeffffeeeerrrreeeennnncccceeee MMMMaaaannnnuuuuaaaallll iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) AAAAttttttttrrrriiiibbbbuuuutttteeee pppprrrreeeeffffeeeerrrreeeennnncccceeee qqqquuuueeeerrrriiiieeeessss virtual iflDataType getPreferredType() virtual iflOrder getPreferredOrder() virtual iflOrientation getPreferredOrientation() virtual iflColorModel getPreferredColorModel(int nc=0) virtual iflCompression getPreferredCompression() virtual void getPreferredPageSize(int iWidth, int iHeight, int iz, int ic, int& pWidth, int& pHeight, int& pz, int& pc, iflOrientation orientation) IIIInnnnhhhheeeerrrriiiittttiiiinnnngggg aaaattttttttrrrriiiibbbbuuuutttteeeessss iflStatus applyDefaults(iflFile* source, iflFileConfig& config) iflStatus applyDefaults(iflFileConfig* source, iflFileConfig& config) int haveDSOVersion(int major, int minor) int haveICC() FFFFUUUUNNNNCCCCTTTTIIIIOOOONNNN DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNNSSSS iiiiffffllllFFFFoooorrrrmmmmaaaatttt(((()))) iflFormat(const char* formatName) _p_r_o_t_e_c_t_e_d Derived classes should pass the name of the format as _f_o_r_m_a_t_N_a_m_e so the format will be properly registered in the database. This name must match the name used in the 'ifl_database' file. aaaacccccccceeeessssssssMMMMooooddddeeeeIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(((()))) int accessModeIsSupported(int mode) This virtual member function tells whether the given access mode (which must be one of _O__R_D_O_N_L_Y, _O__W_R_O_N_L_Y, or _O__R_D_W_R) is supported by the subclass. Note that this function is also provided by iflDatabase, which gets the information from the FTR database without the overhead of opening any DSOs. aaaappppppppllllyyyyDDDDeeeeffffaaaauuuullllttttssss(((()))) iflStatus applyDefaults(iflFile* source, iflFileConfig& config) iflStatus applyDefaults(iflFileConfig* source, iflFileConfig& config) These member functions attempt to change all of the parameters of the iflFileConfig, _c_o_n_f_i_g, that have the value 0 (i.e. don't care) to be reasonable values. The values are inherited from the _s_o_u_r_c_e PPPPaaaaggggeeee 3333 iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) IIIImmmmaaaaggggeeee FFFFoooorrrrmmmmaaaatttt LLLLiiiibbbbrrrraaaarrrryyyy CCCC++++++++ RRRReeeeffffeeeerrrreeeennnncccceeee MMMMaaaannnnuuuuaaaallll iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) iflFile* (if it is non-NULL and the value is supported), the _s_o_u_r_c_e iflFileConfig* (if it is non-NULL and the value is supported), or are heuristically selected to be a supported value most suitable for copying data from the source iflFile* or iflFileConfig*. If the _s_o_u_r_c_e iflFile* is NULL or the _s_o_u_r_c_e iflFileConfig* is NULL, the don't-care parameters are changed to the image file format's preferred values. ccccoooolllloooorrrrMMMMooooddddeeeellllIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(((()))) virtual int colorModelIsSupported(iflColorModel colormodel) This virtual member function tells whether the given color model is supported by the image file format. ccccoooommmmpppprrrreeeessssssssiiiioooonnnnIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(((()))) virtual int compressionIsSupported(iflCompression compression) This virtual member function tells whether the given compression is supported by the image file format. ffffiiiinnnnddddBBBByyyyFFFFiiiilllleeeeNNNNaaaammmmeeee(((()))) static iflFormat* findByFileName(const char* fileName, int noMatchRule = FALSE, int openDSOifNecessary = TRUE) This static class member function is used to look up an image file format by file name, where the file name is given by the _f_i_l_e_n_a_m_e argument. This is accomplished by matching the filename against against the iflExtensions variable given for each image file format in the FTR database. The _n_o_M_a_t_c_h_R_u_l_e argument can be used to limit searching to those formats that have no match rule. The _o_p_e_n_D_S_O_i_f_N_e_c_e_s_s_a_r_y argument can be used to limit searching to those formats whose DSOs have already been opened. ffffiiiinnnnddddBBBByyyyFFFFoooorrrrmmmmaaaattttNNNNaaaammmmeeee(((()))) static iflFormat* findByFormatName(const char* formatName, int openDSOifNecessary = TRUE) This static class member function is used to look up an image file format by name, where the name is given by the _f_o_r_m_a_t_n_a_m_e argument. PPPPaaaaggggeeee 4444 iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) IIIImmmmaaaaggggeeee FFFFoooorrrrmmmmaaaatttt LLLLiiiibbbbrrrraaaarrrryyyy CCCC++++++++ RRRReeeeffffeeeerrrreeeennnncccceeee MMMMaaaannnnuuuuaaaallll iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) The _o_p_e_n_D_S_O_i_f_N_e_c_e_s_s_a_r_y argument can be used to limit searching to those formats whose DSOs have already been opened. ffffiiiinnnnddddBBBByyyyMMMMaaaaggggiiiicccc(((()))) static iflFormat* findByMagic(int fd, int openDSOifNecessary = TRUE) This static class member function is used to look up an image file format by magic number of a given file that is open for reading. The _f_d argument is a file descriptor referring to the file. The _o_p_e_n_D_S_O_i_f_N_e_c_e_s_s_a_r_y argument can be used to limit searching to those formats whose DSOs have already been opened. ffffiiiinnnnddddNNNNeeeexxxxtttt(((()))) static iflFormat* findNext(int& index, int openDSOifNecessary = TRUE) This static class member function is used to step through the (static, lazily created) list of supported file formats. To start searching initialize the _i_n_d_e_x paramter to zero. It will be automatically updated by each call so that successive calls will iterate through all available formats. If there are no more formats, the function returns NULL. If _o_p_e_n_D_S_O_i_f_N_e_c_e_s_s_a_r_y is false, then no DSOs will be opened, and only formats whose DSOs have already been opened will be returned. The following example prints the names of all supported formats: (note that iflDatabase can do this too): iflFormat* fmt; int index = 0; while ((fmt = iflFormat::findNext(index)) != NULL) printf("%s\n", fmt->getName()); ggggeeeettttDDDDeeeeffffaaaauuuullllttttSSSSuuuuffffffffiiiixxxx(((()))) const char* getDefaultSuffix() This member function returns the default filename suffix (the first suffix listed in the "suffixes" declaration for a format in the IFL format database). The returned value is a pointer to a static string that is valid forever. Note that the returned value may be NULL. PPPPaaaaggggeeee 5555 iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) IIIImmmmaaaaggggeeee FFFFoooorrrrmmmmaaaatttt LLLLiiiibbbbrrrraaaarrrryyyy CCCC++++++++ RRRReeeeffffeeeerrrreeeennnncccceeee MMMMaaaannnnuuuuaaaallll iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) ggggeeeettttDDDDeeeessssccccrrrriiiippppttttiiiioooonnnn(((()))) const char* getDescription() This member function returns the format description, or NULL if there is none. ggggeeeettttNNNNaaaammmmeeee(((()))) const char* getName() This member function returns the format name, which is a pointer to a static string that is valid forever. ggggeeeettttPPPPrrrreeeeffffeeeerrrrrrrreeeeddddCCCCoooolllloooorrrrMMMMooooddddeeeellll(((()))) virtual iflColorModel getPreferredColorModel(int nc=0) This virtual member function returns the image file format's "preferred" value for the color model attribute for an image with _n_c channels. If _n_c is zero the most common color model will be returned. The returned value must be one of the supported color models, as reported by the ccccoooolllloooorrrrMMMMooooddddeeeellllIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd() method. ggggeeeettttPPPPrrrreeeeffffeeeerrrrrrrreeeeddddCCCCoooommmmpppprrrreeeessssssssiiiioooonnnn(((()))) virtual iflCompression getPreferredCompression() This virtual member function returns the image file format's "preferred" value for the compression attribute. The returned value must be one of the supported compressions, as reported by the ccccoooommmmpppprrrreeeessssssssiiiioooonnnnIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd() method. ggggeeeettttPPPPrrrreeeeffffeeeerrrrrrrreeeeddddOOOOrrrrddddeeeerrrr(((()))) virtual iflOrder getPreferredOrder() This virtual member function returns the image file format's "preferred" value for the order attribute. The returned value must be one of the supported orders, as reported by the oooorrrrddddeeeerrrrIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd() method. ggggeeeettttPPPPrrrreeeeffffeeeerrrrrrrreeeeddddOOOOrrrriiiieeeennnnttttaaaattttiiiioooonnnn(((()))) virtual iflOrientation getPreferredOrientation() PPPPaaaaggggeeee 6666 iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) IIIImmmmaaaaggggeeee FFFFoooorrrrmmmmaaaatttt LLLLiiiibbbbrrrraaaarrrryyyy CCCC++++++++ RRRReeeeffffeeeerrrreeeennnncccceeee MMMMaaaannnnuuuuaaaallll iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) This virtual member function returns the image file format's "preferred" value for the orientation attribute. The returned value must be one of the supported orientations, as reported by the oooorrrriiiieeeennnnttttaaaattttiiiioooonnnnIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd() method. ggggeeeettttPPPPrrrreeeeffffeeeerrrrrrrreeeeddddPPPPaaaaggggeeeeSSSSiiiizzzzeeee(((()))) virtual void getPreferredPageSize(int iWidth, int iHeight, int iz, int ic, int& pWidth, int& pHeight, int& pz, int& pc, iflOrientation orientation) This virtual member function returns the image file format's "preferred" page size, _p_W_i_d_t_h, _p_H_e_i_g_h_t, _p_z and _p_c, for an image whose size is _i_W_i_d_t_h, _i_H_e_i_g_h_t, _i_z and _i_c (which must be a supported page size; the caller can check this by calling ppppaaaaggggeeeeSSSSiiiizzzzeeeeIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd()). ggggeeeettttPPPPrrrreeeeffffeeeerrrrrrrreeeeddddTTTTyyyyppppeeee(((()))) virtual iflDataType getPreferredType() This virtual member function returns the image file format's "preferred" value for the data type attribute. The returned value must be one of the supported data types, as reported by the ttttyyyyppppeeeeIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd() method. hhhhaaaavvvveeeeDDDDSSSSOOOOVVVVeeeerrrrssssiiiioooonnnn(((()))) int haveDSOVersion(int major, int minor) This member function returns TRUE if the DSO loaded is the same of newer than the indicated major and minor version numbers. hhhhaaaavvvveeeeIIIICCCCCCCC(((()))) int haveICC() This member function returns TRUE if the DSO loaded supports the ICC methods: ggggeeeettttIIIICCCCCCCCPPPPrrrrooooffffiiiilllleeee(), ffffrrrreeeeeeeeIIIICCCCCCCCPPPPrrrrooooffffiiiilllleeee() and sssseeeettttIIIICCCCCCCCPPPPrrrrooooffffiiiilllleeee(). oooorrrrddddeeeerrrrIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(((()))) virtual int orderIsSupported(iflOrder order) PPPPaaaaggggeeee 7777 iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) IIIImmmmaaaaggggeeee FFFFoooorrrrmmmmaaaatttt LLLLiiiibbbbrrrraaaarrrryyyy CCCC++++++++ RRRReeeeffffeeeerrrreeeennnncccceeee MMMMaaaannnnuuuuaaaallll iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) This virtual member function tells whether the given dimension order is supported by the image file format. oooorrrriiiieeeennnnttttaaaattttiiiioooonnnnIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(((()))) virtual int orientationIsSupported(iflOrientation orientation) This virtual member function tells whether the given orientation is supported by the image file format. ppppaaaaggggeeeeSSSSiiiizzzzeeeeIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(((()))) virtual int pageSizeIsSupported(int iWidth, int iHeight, int iz, int ic, int pWidth, int pHeight, int pz, int pc, iflOrientation orientation) This virtual member function tells whether the image file format supports the given page size, _p_W_i_d_t_h, _p_H_e_i_g_h_t, _p_z and _p_c, for an image whose size is _i_W_i_d_t_h, _i_H_e_i_g_h_t, _i_z and _i_c (which must be a supported image size; the caller can check this by calling ssssiiiizzzzeeeeIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd()). ppppaaaaggggiiiinnnnggggIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(((()))) virtual int pagingIsSupported() This virtual member function tells whether the image file format supports any page size other than the entire image size. This might be useful to a GUI application that allows the user to enter a page size; the text entry widget could be disabled if paging is not supported. rrrraaaannnnddddoooommmmAAAAcccccccceeeessssssssRRRReeeeaaaaddddIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(((()))) virtual int randomAccessReadIsSupported() This virtual member function tells whether the corresponding iflFile subclass supports random access reads (as opposed to requiring that reads occur sequentially). If the subclass does not support random access reads, out-of-order calls to ggggeeeettttPPPPaaaaggggeeee() may return iflStatusEncode(iflUNSUPPORTEDBYFORMAT) (if the limitation is inherent in the file format) or iflStatusEncode(iflUNSUPPORTEDBYLIBRARY) (if the limitation is due to the implementation of the iflFile subclass). PPPPaaaaggggeeee 8888 iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) IIIImmmmaaaaggggeeee FFFFoooorrrrmmmmaaaatttt LLLLiiiibbbbrrrraaaarrrryyyy CCCC++++++++ RRRReeeeffffeeeerrrreeeennnncccceeee MMMMaaaannnnuuuuaaaallll iiiiffffllllFFFFoooorrrrmmmmaaaatttt((((3333)))) This function is irrelevant for formats that do not support reading or that do not support paging. rrrraaaannnnddddoooommmmAAAAcccccccceeeessssssssWWWWrrrriiiitttteeeeIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(((()))) virtual int randomAccessWriteIsSupported() This virtual member function tells whether the corresponding iflFile subclass supports random access writes (as opposed to requiring that writes occur sequentially). If the subclass does not support random access writes, out-of-order calls to sssseeeettttPPPPaaaaggggeeee() may return iflStatusEncode(iflUNSUPPORTEDBYFORMAT) (if the limitation is inherent in the file format) or iflStatusEncode(iflUNSUPPORTEDBYLIBRARY) (if the limitation is due to the implementation of the iflFile subclass). This function is irrelevant for formats that do not support writing or that do not support paging. ssssiiiizzzzeeeeIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(((()))) virtual int sizeIsSupported(int width, int height, int z, int c, iflOrientation orientation) This virtual member function tells whether the given image size, _w_i_d_t_h, _h_e_i_g_h_t, _z and _c, (which the caller must guarantee are all positive values) is supported by the image file format. ttttyyyyppppeeeeIIIIssssSSSSuuuuppppppppoooorrrrtttteeeedddd(((()))) virtual int typeIsSupported(iflDataType type) This virtual member function tells whether the given data type is supported by the image file format. SSSSEEEEEEEE AAAALLLLSSSSOOOO iflFile, iflDatabase NNNNOOOOTTTTEEEE Applications that use iflFormat functionality should check to see whether the less-filling iflDatabase satisfies its needs. PPPPaaaaggggeeee 9999 
