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/* Copyright (c) Mark J. Kilgard, 1995, 1998. */
/* This program is freely distributable without licensing fees
and is provided without guarantee or warrantee expressed or
implied. This program is -not- in the public domain. */
#include "glutint.h"
#if !defined(_WIN32)
#include <X11/Xatom.h> /* For XA_CURSOR */
#include <X11/cursorfont.h>
#endif
typedef struct _CursorTable {
#if defined(_WIN32)
char* glyph;
#else
int glyph;
#endif
Cursor cursor;
} CursorTable;
/* *INDENT-OFF* */
static CursorTable cursorTable[] = {
{XC_arrow, None}, /* GLUT_CURSOR_RIGHT_ARROW */
{XC_top_left_arrow, None}, /* GLUT_CURSOR_LEFT_ARROW */
{XC_hand1, None}, /* GLUT_CURSOR_INFO */
{XC_pirate, None}, /* GLUT_CURSOR_DESTROY */
{XC_question_arrow, None}, /* GLUT_CURSOR_HELP */
{XC_exchange, None}, /* GLUT_CURSOR_CYCLE */
{XC_spraycan, None}, /* GLUT_CURSOR_SPRAY */
{XC_watch, None}, /* GLUT_CURSOR_WAIT */
{XC_xterm, None}, /* GLUT_CURSOR_TEXT */
{XC_crosshair, None}, /* GLUT_CURSOR_CROSSHAIR */
{XC_sb_v_double_arrow, None}, /* GLUT_CURSOR_UP_DOWN */
{XC_sb_h_double_arrow, None}, /* GLUT_CURSOR_LEFT_RIGHT */
{XC_top_side, None}, /* GLUT_CURSOR_TOP_SIDE */
{XC_bottom_side, None}, /* GLUT_CURSOR_BOTTOM_SIDE */
{XC_left_side, None}, /* GLUT_CURSOR_LEFT_SIDE */
{XC_right_side, None}, /* GLUT_CURSOR_RIGHT_SIDE */
{XC_top_left_corner, None}, /* GLUT_CURSOR_TOP_LEFT_CORNER */
{XC_top_right_corner, None}, /* GLUT_CURSOR_TOP_RIGHT_CORNER */
{XC_bottom_right_corner, None}, /* GLUT_CURSOR_BOTTOM_RIGHT_CORNER */
{XC_bottom_left_corner, None}, /* GLUT_CURSOR_BOTTOM_LEFT_CORNER */
};
/* *INDENT-ON* */
#if !defined(_WIN32)
static Cursor blankCursor = None;
static Cursor fullCrosshairCusor = None;
/* SGI X server's support a special property called the
_SGI_CROSSHAIR_CURSOR that when installed as a window's
cursor, becomes a full screen crosshair cursor. SGI
has special cursor generation hardware for this case. */
static Cursor
getFullCrosshairCursor(void)
{
Cursor cursor;
Atom crosshairAtom, actualType;
int rc, actualFormat;
unsigned long n, left;
unsigned long *value;
if (fullCrosshairCusor == None) {
crosshairAtom = XInternAtom(__glutDisplay,
"_SGI_CROSSHAIR_CURSOR", True);
if (crosshairAtom != None) {
value = 0; /* Make compiler happy. */
rc = XGetWindowProperty(__glutDisplay, __glutRoot,
crosshairAtom, 0, 1, False, XA_CURSOR, &actualType,
&actualFormat, &n, &left, (unsigned char **) &value);
if (rc == Success && actualFormat == 32 && n >= 1) {
cursor = value[0];
XFree(value);
return cursor;
}
}
}
return XCreateFontCursor(__glutDisplay, XC_crosshair);
}
/* X11 forces you to create a blank cursor if you want
to disable the cursor. */
static Cursor
makeBlankCursor(void)
{
static char data[1] =
{0};
Cursor cursor;
Pixmap blank;
XColor dummy;
blank = XCreateBitmapFromData(__glutDisplay, __glutRoot,
data, 1, 1);
if (blank == None)
__glutFatalError("out of memory.");
cursor = XCreatePixmapCursor(__glutDisplay, blank, blank,
&dummy, &dummy, 0, 0);
XFreePixmap(__glutDisplay, blank);
return cursor;
}
#endif /* !_WIN32 */
/* Win32 and X11 use this same function to accomplish
fairly different tasks. X11 lets you just define the
cursor for a window and the window system takes care
of making sure that the window's cursor is installed
when the mouse is in the window. Win32 requires the
application to handle a WM_SETCURSOR message to install
the right cursor when windows are entered. Think of
the Win32 __glutSetCursor (called from __glutWindowProc)
as "install cursor". Think of the X11 __glutSetCursor
(called from glutSetCursor) as "define cursor". */
void
__glutSetCursor(GLUTwindow *window)
{
int cursor = window->cursor;
Cursor xcursor = 0;
if (cursor >= 0 &&
cursor < sizeof(cursorTable) / sizeof(cursorTable[0])) {
if (cursorTable[cursor].cursor == None) {
cursorTable[cursor].cursor = XCreateFontCursor(__glutDisplay,
cursorTable[cursor].glyph);
}
xcursor = cursorTable[cursor].cursor;
} else {
/* Special cases. */
switch (cursor) {
case GLUT_CURSOR_INHERIT:
#if defined(_WIN32)
while (window->parent) {
window = window->parent;
if (window->cursor != GLUT_CURSOR_INHERIT) {
__glutSetCursor(window);
return;
}
}
/* XXX Default to an arrow cursor. Is this
right or should we be letting the default
window proc be installing some system cursor? */
xcursor = cursorTable[0].cursor;
if (xcursor == NULL) {
xcursor =
cursorTable[0].cursor =
LoadCursor(NULL, cursorTable[0].glyph);
}
#else
xcursor = None;
#endif
break;
case GLUT_CURSOR_NONE:
#if defined(_WIN32)
xcursor = NULL;
#else
if (blankCursor == None) {
blankCursor = makeBlankCursor();
}
xcursor = blankCursor;
#endif
break;
case GLUT_CURSOR_FULL_CROSSHAIR:
#if defined(_WIN32)
xcursor = (HICON) IDC_CROSS;
#else
if (fullCrosshairCusor == None) {
fullCrosshairCusor = getFullCrosshairCursor();
}
xcursor = fullCrosshairCusor;
#endif
break;
}
}
XDefineCursor(__glutDisplay,
window->win, xcursor);
XFlush(__glutDisplay);
}
/* CENTRY */
void APIENTRY
glutSetCursor(int cursor)
{
#ifdef _WIN32
POINT point;
__glutCurrentWindow->cursor = cursor;
/* Are we in the window right now? If so,
install the cursor. */
GetCursorPos(&point);
if (__glutCurrentWindow->win == WindowFromPoint(point)) {
__glutSetCursor(__glutCurrentWindow);
}
#else
__glutCurrentWindow->cursor = cursor;
__glutSetCursor(__glutCurrentWindow);
#endif
}
/* ENDCENTRY */
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