2 '\" Copyright (c) 1994 The Regents of the University of California.
3 '\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
5 '\" See the file "license.terms" for information on usage and redistribution
6 '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
8 '\" RCS: @(#) $Id: GetImage.3,v 1.5 2002/08/05 04:30:38 dgp Exp $
10 '\" The definitions below are for supplemental macros used in Tcl/Tk
13 '\" .AP type name in/out ?indent?
14 '\" Start paragraph describing an argument to a library procedure.
15 '\" type is type of argument (int, etc.), in/out is either "in", "out",
16 '\" or "in/out" to describe whether procedure reads or modifies arg,
17 '\" and indent is equivalent to second arg of .IP (shouldn't ever be
18 '\" needed; use .AS below instead)
21 '\" Give maximum sizes of arguments for setting tab stops. Type and
22 '\" name are examples of largest possible arguments that will be passed
23 '\" to .AP later. If args are omitted, default tab stops are used.
26 '\" Start box enclosure. From here until next .BE, everything will be
27 '\" enclosed in one large box.
30 '\" End of box enclosure.
33 '\" Begin code excerpt.
38 '\" .VS ?version? ?br?
39 '\" Begin vertical sidebar, for use in marking newly-changed parts
40 '\" of man pages. The first argument is ignored and used for recording
41 '\" the version when the .VS was added, so that the sidebars can be
42 '\" found and removed when they reach a certain age. If another argument
43 '\" is present, then a line break is forced before starting the sidebar.
46 '\" End of vertical sidebar.
49 '\" Begin an indented unfilled display.
52 '\" End of indented unfilled display.
55 '\" Start of list of standard options for a Tk widget. The
56 '\" options follow on successive lines, in four columns separated
60 '\" End of list of standard options for a Tk widget.
62 '\" .OP cmdName dbName dbClass
63 '\" Start of description of a specific option. cmdName gives the
64 '\" option's name as specified in the class command, dbName gives
65 '\" the option's name in the option database, and dbClass gives
66 '\" the option's class in the option database.
69 '\" Print arg1 underlined, then print arg2 normally.
71 '\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
73 '\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
77 '\" # Start an argument description
81 . ie !"\\$2"" .TP \\n()Cu
86 \&\\$1 \\fI\\$2\\fP (\\$3)
99 '\" # define tabbing values for .AP
102 .if !"\\$1"" .nr )A \\w'\\$1'u+3n
105 .if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
106 .nr )C \\n()Bu+\\w'(in/out)'u+2n
108 .AS Tcl_Interp Tcl_CreateInterp in/out
109 '\" # BS - start boxed text
110 '\" # ^y = starting y location
118 .if n \l'\\n(.lu\(ul'
121 '\" # BE - end boxed text (draw box now)
126 .ie n \l'\\n(^lu\(ul'
128 .\" Draw four-sided box normally, but don't draw top of
129 .\" box if the box started on an earlier page.
131 \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
134 \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
141 '\" # VS - start vertical sidebar
142 '\" # ^Y = starting y location
143 '\" # ^v = 1 (for troff; for nroff this doesn't matter)
147 .ie n 'mc \s12\(br\s0
150 '\" # VE - end of vertical sidebar
158 \h'|\\n(^lu+3n'\L'|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-|\\n(^lu+3n'
165 '\" # Special macro to handle page bottom: finish off current
166 '\" # box/sidebar if in box/sidebar mode, then invoked standard
167 '\" # page bottom macro.
174 .\" Draw three-sided box if this is the box's first page,
175 .\" draw two sides but no top otherwise.
176 .ie !\\n(^b-1 \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c
177 .el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c
180 .nr ^x \\n(^tu+1v-\\n(^Yu
181 \kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c
194 '\" # DS - begin display
200 '\" # DE - end display
206 '\" # SO - start of list of standard options
208 .SH "STANDARD OPTIONS"
214 '\" # SE - end of list of standard options
219 See the \\fBoptions\\fR manual entry for details on the standard options.
221 '\" # OP - start of full description for a single option
226 Command-Line Name: \\fB\\$1\\fR
227 Database Name: \\fB\\$2\\fR
228 Database Class: \\fB\\$3\\fR
232 '\" # CS - begin code excerpt
238 '\" # CE - end code excerpt
246 .TH Tk_GetImage 3 4.0 Tk "Tk Library Procedures"
249 Tk_GetImage, Tk_RedrawImage, Tk_SizeOfImage, Tk_FreeImage \- use an image in a widget
252 \fB#include <tk.h>\fR
255 \fBTk_GetImage\fR(\fIinterp, tkwin, name, changeProc, clientData\fR)
257 \fBTk_RedrawImage\fR(\fIimage, imageX, imageY, width, height, drawable, drawableX, drawableY\fR)
259 \fBTk_SizeOfImage\fR(\fIimage, widthPtr, heightPtr\fR)
261 \fBTk_FreeImage\fR(\fIimage\fR)
263 .AS Tk_ImageChangedProc *changeProc
264 .AP Tcl_Interp *interp in
265 Place to leave error message.
266 .AP Tk_Window tkwin in
267 Window in which image will be used.
268 .AP "CONST char" *name in
270 .AP Tk_ImageChangedProc *changeProc in
271 Procedure for Tk to invoke whenever image content or size changes.
272 .AP ClientData clientData in
273 One-word value for Tk to pass to \fIchangeProc\fR.
274 .AP Tk_Image image in
275 Token for image instance; must have been returned by a previous
276 call to \fBTk_GetImage\fR.
278 X-coordinate of upper-left corner of region of image to redisplay
279 (measured in pixels from the image's upper-left corner).
281 Y-coordinate of upper-left corner of region of image to redisplay
282 (measured in pixels from the image's upper-left corner).
284 Width of region of image to redisplay.
285 .AP "int" height (in)
286 Height of region of image to redisplay.
287 .AP Drawable drawable in
288 Where to display image. Must either be window specified to
289 \fBTk_GetImage\fR or a pixmap compatible with that window.
291 Where to display image in \fIdrawable\fR: this is the x-coordinate
292 in \fIdrawable\fR where x-coordinate \fIimageX\fR of the image
295 Where to display image in \fIdrawable\fR: this is the y-coordinate
296 in \fIdrawable\fR where y-coordinate \fIimageY\fR of the image
298 .AP "int" widthPtr out
299 Store width of \fIimage\fR (in pixels) here.
300 .AP "int" heightPtr out
301 Store height of \fIimage\fR (in pixels) here.
306 These procedures are invoked by widgets that wish to display images.
307 \fBTk_GetImage\fR is invoked by a widget when it first decides to
309 \fIname\fR gives the name of the desired image and \fItkwin\fR
310 identifies the window where the image will be displayed.
311 \fBTk_GetImage\fR looks up the image in the table of existing
312 images and returns a token for a new instance of the image.
313 If the image doesn't exist then \fBTk_GetImage\fR returns NULL
314 and leaves an error message in \fIinterp->result\fR.
316 When a widget wishes to actually display an image it must
317 call \fBTk_RedrawImage\fR, identifying the image (\fIimage\fR),
318 a region within the image to redisplay (\fIimageX\fR, \fIimageY\fR,
319 \fIwidth\fR, and \fIheight\fR), and a place to display the
320 image (\fIdrawable\fR, \fIdrawableX\fR, and \fIdrawableY\fR).
321 Tk will then invoke the appropriate image manager, which will
322 display the requested portion of the image before returning.
324 A widget can find out the dimensions of an image by calling
325 \fBTk_SizeOfImage\fR: the width and height will be stored
326 in the locations given by \fIwidthPtr\fR and \fIheightPtr\fR,
329 When a widget is finished with an image (e.g., the widget is
330 being deleted or it is going to use a different image instead
331 of the current one), it must call \fBTk_FreeImage\fR to
332 release the image instance.
333 The widget should never again use the image token after passing
334 it to \fBTk_FreeImage\fR.
335 There must be exactly one call to \fBTk_FreeImage\fR for each
336 call to \fBTk_GetImage\fR.
338 If the contents or size of an image changes, then any widgets
339 using the image will need to find out about the changes so that
340 they can redisplay themselves.
341 The \fIchangeProc\fR and \fIclientData\fR arguments to
342 \fBTk_GetImage\fR are used for this purpose.
343 \fIchangeProc\fR will be called by Tk whenever a change occurs
344 in the image; it must match the following prototype:
346 typedef void Tk_ImageChangedProc(
347 ClientData \fIclientData\fR,
352 int \fIimageWidth\fR,
353 int \fIimageHeight\fR);
355 The \fIclientData\fR argument to \fIchangeProc\fR is the same as the
356 \fIclientData\fR argument to \fBTk_GetImage\fR.
357 It is usually a pointer to the widget record for the widget or
358 some other data structure managed by the widget.
359 The arguments \fIx\fR, \fIy\fR, \fIwidth\fR, and \fIheight\fR
360 identify a region within the image that must be redisplayed;
361 they are specified in pixels measured from the upper-left
363 The arguments \fIimageWidth\fR and \fIimageHeight\fR give
364 the image's (new) size.