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dispblnk.c
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C/C++ Source or Header
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1990-04-20
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7KB
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250 lines
#ifndef lint
static char SccsId[] = "%W% %G%";
#endif
/* Module: dispblnk.c (Display Blink)
* Purpose: Switch between stored displays
* Subroutine: save_blink() returns: void
* Subroutine: free_blink() returns: void
* Subroutine: clear_blink() returns: void
* Subroutine: unset_blink() returns: void
* Subroutine: control_blink() returns: void
* Copyright: 1989 Smithsonian Astrophysical Observatory
* You may do anything you like with this file except remove
* this copyright. The Smithsonian Astrophysical Observatory
* makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without
* express or implied warranty.
* Modified: {0} Michael VanHilst initial version 26 May 1989
* {n} <who> -- <does what> -- <when>
*/
#include <stdio.h> /* get stderr, NULL */
#include <X11/Xlib.h> /* get X types and constants */
#include <X11/Xutil.h> /* X window manager stuff */
#include "hfiles/struct.h" /* declare structure types */
#include "hfiles/extern.h" /* extern main ximage parameter structures */
#include "hfiles/constant.h" /* define SOP */
#define MetaMask Mod1Mask
static struct {
char *buf;
Pixmap pixmap;
int depth;
int bufsz;
int byte_width;
} blink[4] = { { 0 }, { 0 }, { 0 }, { 0 } };
static int current_index = 0;
/*
* Subroutine: save_blink
* Purpose: Save the current display in a blink buffer
*/
void save_blink ( button )
int button;
{
int bufsz, index;
GC gc, set_gc();
char *calloc_errchk();
if( blink[0].buf == NULL ) {
blink[0].buf = dispbox.image.data;
blink[0].depth = dispbox.image.depth;
blink[0].byte_width = dispbox.image.bytes_per_line;
}
if( blink[0].depth == 1 )
bufsz = ((dispbox.xwidth + 7) / 8) * dispbox.yheight * sizeof(short);
else
bufsz = dispbox.xwidth * dispbox.yheight;
if( button == Button1 )
index = 1;
else if( button == Button2 )
index = 2;
else
index = 3;
if( blink[index].bufsz != bufsz ) {
if( blink[index].buf != NULL ) {
free((char *)blink[index].buf);
blink[index].buf = NULL;
}
if( blink[index].pixmap != NULL ) {
XFreePixmap (dispbox.display, blink[index].pixmap);
blink[index].pixmap = NULL;
}
blink[index].depth = blink[0].depth;
if( (blink[index].pixmap =
XCreatePixmap(dispbox.display, dispbox.ID, dispbox.xwidth,
dispbox.yheight, blink[index].depth)) == NULL )
blink[index].buf = calloc_errchk(bufsz, 1, "blink");
blink[index].bufsz = bufsz;
}
if( blink[index].pixmap != NULL ) {
gc = set_gc(&(color.gcset.disp));
if( blink[index].depth == 1 )
XCopyPlane(dispbox.display, dispbox.ID, blink[index].pixmap, gc,
dispbox.xzero, dispbox.yzero,
dispbox.xwidth, dispbox.yheight, 0, 0, 1);
else
XCopyArea(dispbox.display, dispbox.ID, blink[index].pixmap, gc,
dispbox.xzero, dispbox.yzero,
dispbox.xwidth, dispbox.yheight, 0, 0);
} else {
bcopy((char *)dispbox.image.data, blink[index].buf, bufsz);
blink[index].depth = dispbox.image.depth;
blink[index].byte_width = dispbox.image.bytes_per_line;
}
}
/*
* Subroutine: free_blink
* Purpose: When dispbox changes size, dump all current buffers
*/
void free_blink ( )
{
int i;
void clear_blink();
clear_blink();
for( i=1; i<4; i++ ) {
if( blink[i].buf != NULL ) {
free((char *)blink[i].buf);
blink[i].buf = NULL;
}
if( blink[i].pixmap != NULL ) {
XFreePixmap (dispbox.display, blink[i].pixmap);
blink[i].pixmap = NULL;
}
blink[i].bufsz = 0;
}
}
/*
* Subroutine: clear_blink
* Purpose: Reset basic blink parameters when color arrangements change
*/
void clear_blink ( )
{
if( (blink[0].buf != NULL) && (current_index != 0) ) {
dispbox.image.depth = blink[0].depth;
dispbox.image.bytes_per_line = blink[0].byte_width;
dispbox.image.data = blink[0].buf;
}
current_index = 0;
blink[0].buf = NULL;
}
/*
* Subroutine: unset_blink
* Purpose: Indicate that display no longer holds a blinking image
* Use when display is redrawn by regular display update routine
*/
void unset_blink ( )
{
current_index = 0;
}
/*
* Subroutine: display_blink
*/
static int display_blink ( index )
int index;
{
GC gc, set_gc();
void disp_dispbox();
if( blink[index].pixmap != NULL ) {
gc = set_gc(&(color.gcset.disp));
if( blink[index].depth == 1 )
XCopyPlane(dispbox.display, blink[index].pixmap, dispbox.ID, gc, 0, 0,
dispbox.xwidth, dispbox.yheight,
dispbox.xzero, dispbox.yzero, 1);
else
XCopyArea(dispbox.display, blink[index].pixmap, dispbox.ID, gc, 0, 0,
dispbox.xwidth, dispbox.yheight, dispbox.xzero, dispbox.yzero);
} else if( blink[index].buf != NULL ) {
dispbox.image.data = blink[index].buf;
dispbox.image.depth = blink[index].depth;
dispbox.image.bytes_per_line = blink[index].byte_width;
disp_dispbox();
} else
return( 0 );
current_index = index;
XSync (dispbox.display, 0);
return( 1 );
}
/*
* Subroutine: control_blink
* Purpose: Control blinking of stored displays
* For each new button press, put it on top of stack and display its buffer
* For each button release, if it is on top of stack, release it and display
* one below, else just release it
*/
void control_blink ()
{
static int oldmode;
static int buttons = 0;
static int btnstack[4];
int i;
static int display_blink();
if( control.event.type == ButtonPress ) {
/* don't respond if it's with a meta key (window resize) */
if( control.event.xbutton.state & (ControlMask | MetaMask) )
return;
if( ++buttons == 1 ) {
/* store mode (may be called from other mode) */
oldmode = control.mode;
control.mode = SOP;
/* events to send through here in any case */
control.priority = ButtonPressMask | ButtonReleaseMask;
}
btnstack[buttons] = control.event.xbutton.button;
} else if( control.event.type == ButtonRelease ) {
/* don't respond if we weren't doing anything */
if( buttons <= 0 )
return;
if( buttons == 1 ) {
/* unset tracking priority */
control.mode = oldmode;
control.priority = 0;
}
if( btnstack[buttons] != control.event.xbutton.button ) {
/* button other than top one released, lower the stack */
for( i = 1;
(i <= buttons) && (btnstack[i] != control.event.xbutton.button);
i++ );
while( i<buttons ) {
btnstack[i] = btnstack[i+1];
++i;
}
--buttons;
return;
} else {
--buttons;
}
} else {
/* not our kind of event */
return;
}
/* which buffer is indicated? */
switch( btnstack[buttons] ) {
case Button1:
i = 1;
break;
case Button2:
i = 2;
break;
case Button3:
i = 3;
break;
default:
i = 0;
break;
}
/* display the selected buffer */
if( display_blink(i) == 0 )
(void)fprintf(stderr, "WARNING: Frame[%d] is empty\n", buttons);
}