| 1 | '\" |
| 2 | '\" Copyright (c) 1994 The Australian National University |
| 3 | '\" Copyright (c) 1994-1997 Sun Microsystems, Inc. |
| 4 | '\" |
| 5 | '\" See the file "license.terms" for information on usage and redistribution |
| 6 | '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
| 7 | '\" |
| 8 | '\" Author: Paul Mackerras (paulus@cs.anu.edu.au), |
| 9 | '\" Department of Computer Science, |
| 10 | '\" Australian National University. |
| 11 | '\" |
| 12 | '\" RCS: @(#) $Id: CrtPhImgFmt.3,v 1.5 2001/08/23 19:11:22 hobbs Exp $ |
| 13 | '\" |
| 14 | '\" The definitions below are for supplemental macros used in Tcl/Tk |
| 15 | '\" manual entries. |
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| 75 | '\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $ |
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| 77 | '\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages. |
| 78 | .if t .wh -1.3i ^B |
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| 211 | .de SO |
| 212 | .SH "STANDARD OPTIONS" |
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| 223 | See the \\fBoptions\\fR manual entry for details on the standard options. |
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| 230 | Command-Line Name: \\fB\\$1\\fR |
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| 249 | .. |
| 250 | .TH Tk_CreatePhotoImageFormat 3 8.3 Tk "Tk Library Procedures" |
| 251 | .BS |
| 252 | .SH NAME |
| 253 | Tk_CreatePhotoImageFormat \- define new file format for photo images |
| 254 | .SH SYNOPSIS |
| 255 | .nf |
| 256 | \fB#include <tk.h>\fR |
| 257 | .sp |
| 258 | \fBTk_CreatePhotoImageFormat\fR(\fIformatPtr\fR) |
| 259 | .SH ARGUMENTS |
| 260 | .AS Tk_PhotoImageFormat *formatPtr |
| 261 | .AP Tk_PhotoImageFormat *formatPtr in |
| 262 | Structure that defines the new file format. |
| 263 | .BE |
| 264 | |
| 265 | .SH DESCRIPTION |
| 266 | .PP |
| 267 | \fBTk_CreatePhotoImageFormat\fR is invoked to define a new file format |
| 268 | for image data for use with photo images. The code that implements an |
| 269 | image file format is called an image file format handler, or |
| 270 | handler for short. The photo image code |
| 271 | maintains a list of handlers that can be used to read and |
| 272 | write data to or from a file. Some handlers may also |
| 273 | support reading image data from a string or converting image data to a |
| 274 | string format. |
| 275 | The user can specify which handler to use with the \fB\-format\fR |
| 276 | image configuration option or the \fB\-format\fR option to the |
| 277 | \fBread\fR and \fBwrite\fR photo image subcommands. |
| 278 | .PP |
| 279 | An image file format handler consists of a collection of procedures |
| 280 | plus a Tk_PhotoImageFormat structure, which contains the name of the |
| 281 | image file format and pointers to six procedures provided by the |
| 282 | handler to deal with files and strings in this format. The |
| 283 | Tk_PhotoImageFormat structure contains the following fields: |
| 284 | .CS |
| 285 | typedef struct Tk_PhotoImageFormat { |
| 286 | char *\fIname\fR; |
| 287 | Tk_ImageFileMatchProc *\fIfileMatchProc\fR; |
| 288 | Tk_ImageStringMatchProc *\fIstringMatchProc\fR; |
| 289 | Tk_ImageFileReadProc *\fIfileReadProc\fR; |
| 290 | Tk_ImageStringReadProc *\fIstringReadProc\fR; |
| 291 | Tk_ImageFileWriteProc *\fIfileWriteProc\fR; |
| 292 | Tk_ImageStringWriteProc *\fIstringWriteProc\fR; |
| 293 | } Tk_PhotoImageFormat; |
| 294 | .CE |
| 295 | .PP |
| 296 | The handler need not provide implementations of all six procedures. |
| 297 | For example, the procedures that handle string data would not be |
| 298 | provided for a format in which the image data are stored in binary, |
| 299 | and could therefore contain null characters. If any procedure is not |
| 300 | implemented, the corresponding pointer in the Tk_PhotoImageFormat |
| 301 | structure should be set to NULL. The handler must provide the |
| 302 | \fIfileMatchProc\fR procedure if it provides the \fIfileReadProc\fR |
| 303 | procedure, and the \fIstringMatchProc\fR procedure if it provides the |
| 304 | \fIstringReadProc\fR procedure. |
| 305 | |
| 306 | .SH PORTABILITY |
| 307 | .PP |
| 308 | In Tk 8.2 and earlier, a different interface was used. Tk 8.3 will |
| 309 | still support the old format handlers if the format name is in upper |
| 310 | case. If you still want to compile old format handlers with Tk8.3, |
| 311 | use the flag -DUSE_OLD_IMAGE. This will restore all function prototypes |
| 312 | to match the pre-8.3 situation. |
| 313 | |
| 314 | .SH NAME |
| 315 | .PP |
| 316 | \fIformatPtr->name\fR provides a name for the image type. |
| 317 | Once \fBTk_CreatePhotoImageFormat\fR returns, this name may be used |
| 318 | in the \fB\-format\fR photo image configuration and subcommand option. |
| 319 | The manual page for the photo image (photo(n)) describes how image |
| 320 | file formats are chosen based on their names and the value given to |
| 321 | the \fB\-format\fR option. For new format handlers, the name should |
| 322 | be in lower case. Pre-8.3 format handlers are assumed to be in |
| 323 | upper case. |
| 324 | |
| 325 | .SH FILEMATCHPROC |
| 326 | \fIformatPtr->fileMatchProc\fR provides the address of a procedure for |
| 327 | Tk to call when it is searching for an image file format handler |
| 328 | suitable for reading data in a given file. |
| 329 | \fIformatPtr->fileMatchProc\fR must match the following prototype: |
| 330 | .CS |
| 331 | typedef int Tk_ImageFileMatchProc( |
| 332 | Tcl_Channel \fIchan\fR, |
| 333 | CONST char *\fIfileName\fR, |
| 334 | Tcl_Obj *\fIformat\fR, |
| 335 | int *\fIwidthPtr\fR, |
| 336 | int *\fIheightPtr\fR, |
| 337 | Tcl_Interp *\fIinterp\fR); |
| 338 | .CE |
| 339 | The \fIfileName\fR argument is the name of the file containing the |
| 340 | image data, which is open for reading as \fIchan\fR. The |
| 341 | \fIformat\fR argument contains the value given for the |
| 342 | \fB\-format\fR option, or NULL if the option was not specified. |
| 343 | If the data in the file appears to be in the format supported by this |
| 344 | handler, the \fIformatPtr->fileMatchProc\fR procedure should store the |
| 345 | width and height of the image in *\fIwidthPtr\fR and *\fIheightPtr\fR |
| 346 | respectively, and return 1. Otherwise it should return 0. |
| 347 | |
| 348 | .SH STRINGMATCHPROC |
| 349 | \fIformatPtr->stringMatchProc\fR provides the address of a procedure for |
| 350 | Tk to call when it is searching for an image file format handler for |
| 351 | suitable for reading data from a given string. |
| 352 | \fIformatPtr->stringMatchProc\fR must match the following prototype: |
| 353 | .CS |
| 354 | typedef int Tk_ImageStringMatchProc( |
| 355 | Tcl_Obj *\fIdata\fR, |
| 356 | Tcl_Obj *\fIformat\fR, |
| 357 | int *\fIwidthPtr\fR, |
| 358 | int *\fIheightPtr\fR, |
| 359 | Tcl_Interp *\fIinterp\fR); |
| 360 | .CE |
| 361 | The \fIdata\fR argument points to the object containing the image |
| 362 | data. The \fIformat\fR argument contains the value given for |
| 363 | the \fB\-format\fR option, or NULL if the option was not specified. |
| 364 | If the data in the string appears to be in the format supported by |
| 365 | this handler, the \fIformatPtr->stringMatchProc\fR procedure should |
| 366 | store the width and height of the image in *\fIwidthPtr\fR and |
| 367 | *\fIheightPtr\fR respectively, and return 1. Otherwise it should |
| 368 | return 0. |
| 369 | |
| 370 | .SH FILEREADPROC |
| 371 | \fIformatPtr->fileReadProc\fR provides the address of a procedure for |
| 372 | Tk to call to read data from an image file into a photo image. |
| 373 | \fIformatPtr->fileReadProc\fR must match the following prototype: |
| 374 | .CS |
| 375 | typedef int Tk_ImageFileReadProc( |
| 376 | Tcl_Interp *\fIinterp\fR, |
| 377 | Tcl_Channel \fIchan\fR, |
| 378 | CONST char *\fIfileName\fR, |
| 379 | Tcl_Obj *\fIformat\fR, |
| 380 | PhotoHandle \fIimageHandle\fR, |
| 381 | int \fIdestX\fR, int \fIdestY\fR, |
| 382 | int \fIwidth\fR, int \fIheight\fR, |
| 383 | int \fIsrcX\fR, int \fIsrcY\fR); |
| 384 | .CE |
| 385 | The \fIinterp\fR argument is the interpreter in which the command was |
| 386 | invoked to read the image; it should be used for reporting errors. |
| 387 | The image data is in the file named \fIfileName\fR, which is open for |
| 388 | reading as \fIchan\fR. The \fIformat\fR argument contains the |
| 389 | value given for the \fB\-format\fR option, or NULL if the option was |
| 390 | not specified. The image data in the file, or a subimage of it, is to |
| 391 | be read into the photo image identified by the handle |
| 392 | \fIimageHandle\fR. The subimage of the data in the file is of |
| 393 | dimensions \fIwidth\fR x \fIheight\fR and has its top-left corner at |
| 394 | coordinates (\fIsrcX\fR,\fIsrcY\fR). It is to be stored in the photo |
| 395 | image with its top-left corner at coordinates |
| 396 | (\fIdestX\fR,\fIdestY\fR) using the \fBTk_PhotoPutBlock\fR procedure. |
| 397 | The return value is a standard Tcl return value. |
| 398 | |
| 399 | .SH STRINGREADPROC |
| 400 | \fIformatPtr->stringReadProc\fR provides the address of a procedure for |
| 401 | Tk to call to read data from a string into a photo image. |
| 402 | \fIformatPtr->stringReadProc\fR must match the following prototype: |
| 403 | .CS |
| 404 | typedef int Tk_ImageStringReadProc( |
| 405 | Tcl_Interp *\fIinterp\fR, |
| 406 | Tcl_Obj *\fIdata\fR, |
| 407 | Tcl_Obj *\fIformat\fR, |
| 408 | PhotoHandle \fIimageHandle\fR, |
| 409 | int \fIdestX\fR, int \fIdestY\fR, |
| 410 | int \fIwidth\fR, int \fIheight\fR, |
| 411 | int \fIsrcX\fR, int \fIsrcY\fR); |
| 412 | .CE |
| 413 | The \fIinterp\fR argument is the interpreter in which the command was |
| 414 | invoked to read the image; it should be used for reporting errors. |
| 415 | The \fIdata\fR argument points to the image data in object form. |
| 416 | The \fIformat\fR argument contains the |
| 417 | value given for the \fB\-format\fR option, or NULL if the option was |
| 418 | not specified. The image data in the string, or a subimage of it, is to |
| 419 | be read into the photo image identified by the handle |
| 420 | \fIimageHandle\fR. The subimage of the data in the string is of |
| 421 | dimensions \fIwidth\fR x \fIheight\fR and has its top-left corner at |
| 422 | coordinates (\fIsrcX\fR,\fIsrcY\fR). It is to be stored in the photo |
| 423 | image with its top-left corner at coordinates |
| 424 | (\fIdestX\fR,\fIdestY\fR) using the \fBTk_PhotoPutBlock\fR procedure. |
| 425 | The return value is a standard Tcl return value. |
| 426 | |
| 427 | .SH FILEWRITEPROC |
| 428 | \fIformatPtr->fileWriteProc\fR provides the address of a procedure for |
| 429 | Tk to call to write data from a photo image to a file. |
| 430 | \fIformatPtr->fileWriteProc\fR must match the following prototype: |
| 431 | .CS |
| 432 | typedef int Tk_ImageFileWriteProc( |
| 433 | Tcl_Interp *\fIinterp\fR, |
| 434 | CONST char *\fIfileName\fR, |
| 435 | Tcl_Obj *\fIformat\fR, |
| 436 | Tk_PhotoImageBlock *\fIblockPtr\fR); |
| 437 | .CE |
| 438 | The \fIinterp\fR argument is the interpreter in which the command was |
| 439 | invoked to write the image; it should be used for reporting errors. |
| 440 | The image data to be written are in memory and are described by the |
| 441 | Tk_PhotoImageBlock structure pointed to by \fIblockPtr\fR; see the |
| 442 | manual page FindPhoto(3) for details. The \fIfileName\fR argument |
| 443 | points to the string giving the name of the file in which to write the |
| 444 | image data. The \fIformat\fR argument contains the |
| 445 | value given for the \fB\-format\fR option, or NULL if the option was |
| 446 | not specified. The format string can contain extra characters |
| 447 | after the name of the format. If appropriate, the |
| 448 | \fIformatPtr->fileWriteProc\fR procedure may interpret these |
| 449 | characters to specify further details about the image file. |
| 450 | The return value is a standard Tcl return value. |
| 451 | |
| 452 | .SH STRINGWRITEPROC |
| 453 | \fIformatPtr->stringWriteProc\fR provides the address of a procedure for |
| 454 | Tk to call to translate image data from a photo image into a string. |
| 455 | \fIformatPtr->stringWriteProc\fR must match the following prototype: |
| 456 | .CS |
| 457 | typedef int Tk_ImageStringWriteProc( |
| 458 | Tcl_Interp *\fIinterp\fR, |
| 459 | Tcl_Obj *\fIformat\fR, |
| 460 | Tk_PhotoImageBlock *\fIblockPtr\fR); |
| 461 | .CE |
| 462 | The \fIinterp\fR argument is the interpreter in which the command was |
| 463 | invoked to convert the image; it should be used for reporting errors. |
| 464 | The image data to be converted are in memory and are described by the |
| 465 | Tk_PhotoImageBlock structure pointed to by \fIblockPtr\fR; see the |
| 466 | manual page FindPhoto(3) for details. The data for the string |
| 467 | should be put in the interpreter \fIinterp\fR result. |
| 468 | The \fIformat\fR argument contains the |
| 469 | value given for the \fB\-format\fR option, or NULL if the option was |
| 470 | not specified. The format string can contain extra characters |
| 471 | after the name of the format. If appropriate, the |
| 472 | \fIformatPtr->stringWriteProc\fR procedure may interpret these |
| 473 | characters to specify further details about the image file. |
| 474 | The return value is a standard Tcl return value. |
| 475 | |
| 476 | .SH "SEE ALSO" |
| 477 | Tk_FindPhoto, Tk_PhotoPutBlock |
| 478 | |
| 479 | .SH KEYWORDS |
| 480 | photo image, image file |