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diff --git a/doc/CrtPhImgFmt.3 b/doc/CrtPhImgFmt.3 new file mode 100644 index 0000000..747b631 --- /dev/null +++ b/doc/CrtPhImgFmt.3 @@ -0,0 +1,235 @@ +'\" +'\" Copyright (c) 1994 The Australian National University +'\" Copyright (c) 1994-1997 Sun Microsystems, Inc. +'\" +'\" See the file "license.terms" for information on usage and redistribution +'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. +'\" +'\" Author: Paul Mackerras (paulus@cs.anu.edu.au), +'\" Department of Computer Science, +'\" Australian National University. +'\" +'\" SCCS: @(#) CrtPhImgFmt.3 1.10 97/10/31 12:58:54 +'\" +.so man.macros +.TH Tk_CreatePhotoImageFormat 3 4.0 Tk "Tk Library Procedures" +.BS +.SH NAME +Tk_CreatePhotoImageFormat \- define new file format for photo images +.SH SYNOPSIS +.nf +\fB#include <tk.h>\fR +\fB#include <tkPhoto.h>\fR +.sp +\fBTk_CreatePhotoImageFormat\fR(\fIformatPtr\fR) +.SH ARGUMENTS +.AS Tk_PhotoImageFormat *formatPtr +.AP Tk_PhotoImageFormat *formatPtr in +Structure that defines the new file format. +.BE + +.SH DESCRIPTION +.PP +\fBTk_CreatePhotoImageFormat\fR is invoked to define a new file format +for image data for use with photo images. The code that implements an +image file format is called an image file format handler, or +handler for short. The photo image code +maintains a list of handlers that can be used to read and +write data to or from a file. Some handlers may also +support reading image data from a string or converting image data to a +string format. +The user can specify which handler to use with the \fB\-format\fR +image configuration option or the \fB\-format\fR option to the +\fBread\fR and \fBwrite\fR photo image subcommands. +.PP +An image file format handler consists of a collection of procedures +plus a Tk_PhotoImageFormat structure, which contains the name of the +image file format and pointers to six procedures provided by the +handler to deal with files and strings in this format. The +Tk_PhotoImageFormat structure contains the following fields: +.CS +typedef struct Tk_PhotoImageFormat { + char *\fIname\fR; + Tk_ImageFileMatchProc *\fIfileMatchProc\fR; + Tk_ImageStringMatchProc *\fIstringMatchProc\fR; + Tk_ImageFileReadProc *\fIfileReadProc\fR; + Tk_ImageStringReadProc *\fIstringReadProc\fR; + Tk_ImageFileWriteProc *\fIfileWriteProc\fR; + Tk_ImageStringWriteProc *\fIstringWriteProc\fR; +} Tk_PhotoImageFormat; +.CE +.PP +The handler need not provide implementations of all six procedures. +For example, the procedures that handle string data would not be +provided for a format in which the image data are stored in binary, +and could therefore contain null characters. If any procedure is not +implemented, the corresponding pointer in the Tk_PhotoImageFormat +structure should be set to NULL. The handler must provide the +\fIfileMatchProc\fR procedure if it provides the \fIfileReadProc\fR +procedure, and the \fIstringMatchProc\fR procedure if it provides the +\fIstringReadProc\fR procedure. + +.SH NAME +.PP +\fIformatPtr->name\fR provides a name for the image type. +Once \fBTk_CreatePhotoImageFormat\fR returns, this name may be used +in the \fB\-format\fR photo image configuration and subcommand option. +The manual page for the photo image (photo(n)) describes how image +file formats are chosen based on their names and the value given to +the \fB\-format\fR option. + +.SH FILEMATCHPROC +\fIformatPtr->fileMatchProc\fR provides the address of a procedure for +Tk to call when it is searching for an image file format handler +suitable for reading data in a given file. +\fIformatPtr->fileMatchProc\fR must match the following prototype: +.CS +typedef int Tk_ImageFileMatchProc( + Tcl_Channel \fIchan\fR, + char *\fIfileName\fR, + char *\fIformatString\fR, + int *\fIwidthPtr\fR, + int *\fIheightPtr\fR); +.CE +The \fIfileName\fR argument is the name of the file containing the +image data, which is open for reading as \fIchan\fR. The +\fIformatString\fR argument contains the value given for the +\fB\-format\fR option, or NULL if the option was not specified. +If the data in the file appears to be in the format supported by this +handler, the \fIformatPtr->fileMatchProc\fR procedure should store the +width and height of the image in *\fIwidthPtr\fR and *\fIheightPtr\fR +respectively, and return 1. Otherwise it should return 0. + +.SH STRINGMATCHPROC +\fIformatPtr->stringMatchProc\fR provides the address of a procedure for +Tk to call when it is searching for an image file format handler for +suitable for reading data from a given string. +\fIformatPtr->stringMatchProc\fR must match the following prototype: +.CS +typedef int Tk_ImageStringMatchProc( + char *\fIstring\fR, + char *\fIformatString\fR, + int *\fIwidthPtr\fR, + int *\fIheightPtr\fR); +.CE +The \fIstring\fR argument points to the string containing the image +data. The \fIformatString\fR argument contains the value given for +the \fB\-format\fR option, or NULL if the option was not specified. +If the data in the string appears to be in the format supported by +this handler, the \fIformatPtr->stringMatchProc\fR procedure should +store the width and height of the image in *\fIwidthPtr\fR and +*\fIheightPtr\fR respectively, and return 1. Otherwise it should +return 0. + +.SH FILEREADPROC +\fIformatPtr->fileReadProc\fR provides the address of a procedure for +Tk to call to read data from an image file into a photo image. +\fIformatPtr->fileReadProc\fR must match the following prototype: +.CS +typedef int Tk_ImageFileReadProc( + Tcl_Interp *\fIinterp\fR, + Tcl_Channel \fIchan\fR, + char *\fIfileName\fR, + char *\fIformatString\fR, + PhotoHandle \fIimageHandle\fR, + int \fIdestX\fR, int \fIdestY\fR, + int \fIwidth\fR, int \fIheight\fR, + int \fIsrcX\fR, int \fIsrcY\fR); +.CE +The \fIinterp\fR argument is the interpreter in which the command was +invoked to read the image; it should be used for reporting errors. +The image data is in the file named \fIfileName\fR, which is open for +reading as \fIchan\fR. The \fIformatString\fR argument contains the +value given for the \fB\-format\fR option, or NULL if the option was +not specified. The image data in the file, or a subimage of it, is to +be read into the photo image identified by the handle +\fIimageHandle\fR. The subimage of the data in the file is of +dimensions \fIwidth\fR x \fIheight\fR and has its top-left corner at +coordinates (\fIsrcX\fR,\fIsrcY\fR). It is to be stored in the photo +image with its top-left corner at coordinates +(\fIdestX\fR,\fIdestY\fR) using the \fBTk_PhotoPutBlock\fR procedure. +The return value is a standard Tcl return value. + +.SH STRINGREADPROC +\fIformatPtr->stringReadProc\fR provides the address of a procedure for +Tk to call to read data from a string into a photo image. +\fIformatPtr->stringReadProc\fR must match the following prototype: +.CS +typedef int Tk_ImageStringReadProc( + Tcl_Interp *\fIinterp\fR, + char *\fIstring\fR, + char *\fIformatString\fR, + PhotoHandle \fIimageHandle\fR, + int \fIdestX\fR, int \fIdestY\fR, + int \fIwidth\fR, int \fIheight\fR, + int \fIsrcX\fR, int \fIsrcY\fR); +.CE +The \fIinterp\fR argument is the interpreter in which the command was +invoked to read the image; it should be used for reporting errors. +The \fIstring\fR argument points to the image data in string form. +The \fIformatString\fR argument contains the +value given for the \fB\-format\fR option, or NULL if the option was +not specified. The image data in the string, or a subimage of it, is to +be read into the photo image identified by the handle +\fIimageHandle\fR. The subimage of the data in the string is of +dimensions \fIwidth\fR x \fIheight\fR and has its top-left corner at +coordinates (\fIsrcX\fR,\fIsrcY\fR). It is to be stored in the photo +image with its top-left corner at coordinates +(\fIdestX\fR,\fIdestY\fR) using the \fBTk_PhotoPutBlock\fR procedure. +The return value is a standard Tcl return value. + +.SH FILEWRITEPROC +\fIformatPtr->fileWriteProc\fR provides the address of a procedure for +Tk to call to write data from a photo image to a file. +\fIformatPtr->fileWriteProc\fR must match the following prototype: +.CS +typedef int Tk_ImageFileWriteProc( + Tcl_Interp *\fIinterp\fR, + char *\fIfileName\fR, + char *\fIformatString\fR, + Tk_PhotoImageBlock *\fIblockPtr\fR); +.CE +The \fIinterp\fR argument is the interpreter in which the command was +invoked to write the image; it should be used for reporting errors. +The image data to be written are in memory and are described by the +Tk_PhotoImageBlock structure pointed to by \fIblockPtr\fR; see the +manual page FindPhoto(3) for details. The \fIfileName\fR argument +points to the string giving the name of the file in which to write the +image data. The \fIformatString\fR argument contains the +value given for the \fB\-format\fR option, or NULL if the option was +not specified. The format string can contain extra characters +after the name of the format. If appropriate, the +\fIformatPtr->fileWriteProc\fR procedure may interpret these +characters to specify further details about the image file. +The return value is a standard Tcl return value. + +.SH STRINGWRITEPROC +\fIformatPtr->stringWriteProc\fR provides the address of a procedure for +Tk to call to translate image data from a photo image into a string. +\fIformatPtr->stringWriteProc\fR must match the following prototype: +.CS +typedef int Tk_ImageStringWriteProc( + Tcl_Interp *\fIinterp\fR, + Tcl_DString *\fIdataPtr\fR, + char *\fIformatString\fR, + Tk_PhotoImageBlock *\fIblockPtr\fR); +.CE +The \fIinterp\fR argument is the interpreter in which the command was +invoked to convert the image; it should be used for reporting errors. +The image data to be converted are in memory and are described by the +Tk_PhotoImageBlock structure pointed to by \fIblockPtr\fR; see the +manual page FindPhoto(3) for details. The data for the string +should be appended to the dynamic string given by \fIdataPtr\fR. +The \fIformatString\fR argument contains the +value given for the \fB\-format\fR option, or NULL if the option was +not specified. The format string can contain extra characters +after the name of the format. If appropriate, the +\fIformatPtr->stringWriteProc\fR procedure may interpret these +characters to specify further details about the image file. +The return value is a standard Tcl return value. + +.SH "SEE ALSO" +Tk_FindPhoto, Tk_PhotoPutBlock + +.SH KEYWORDS +photo image, image file |