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/* Copyright (c) Mark J. Kilgard, 1993, 1994. */
/* 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. */
/* Based on XLayerUtil.c: Revision: 1.5 */
#include <stdio.h>
#include <stdlib.h>
#include "layerutil.h"
/* SGI optimization introduced in IRIX 6.3 to avoid X server
round trips for interning common X atoms. */
#include <X11/Xatom.h>
#if defined(_SGI_EXTRA_PREDEFINES) && !defined(NO_FAST_ATOMS)
#include <X11/SGIFastAtom.h>
#else
#define XSGIFastInternAtom(dpy,string,fast_name,how) XInternAtom(dpy,string,how)
#endif
static Bool layersRead = False;
static OverlayInfo **overlayInfoPerScreen;
static unsigned long *numOverlaysPerScreen;
static void
findServerOverlayVisualsInfo(Display * dpy)
{
static Atom overlayVisualsAtom;
Atom actualType;
Status status;
unsigned long sizeData, bytesLeft;
Window root;
int actualFormat, numScreens, i;
if (layersRead == False) {
overlayVisualsAtom = XSGIFastInternAtom(dpy,
"SERVER_OVERLAY_VISUALS", SGI_XA_SERVER_OVERLAY_VISUALS, True);
if (overlayVisualsAtom != None) {
numScreens = ScreenCount(dpy);
overlayInfoPerScreen = (OverlayInfo **)
malloc(numScreens * sizeof(OverlayInfo *));
numOverlaysPerScreen = (unsigned long *)
malloc(numScreens * sizeof(unsigned long));
if (overlayInfoPerScreen != NULL &&
numOverlaysPerScreen != NULL) {
for (i = 0; i < numScreens; i++) {
root = RootWindow(dpy, i);
status = XGetWindowProperty(dpy, root,
overlayVisualsAtom, 0L, (long) 10000, False,
overlayVisualsAtom, &actualType, &actualFormat,
&sizeData, &bytesLeft,
(unsigned char **) &overlayInfoPerScreen[i]);
if (status != Success ||
actualType != overlayVisualsAtom ||
actualFormat != 32 || sizeData < 4)
numOverlaysPerScreen[i] = 0;
else
/* Four 32-bit quantities per
SERVER_OVERLAY_VISUALS entry. */
numOverlaysPerScreen[i] = sizeData / 4;
}
layersRead = True;
} else {
if (overlayInfoPerScreen != NULL)
free(overlayInfoPerScreen);
if (numOverlaysPerScreen != NULL)
free(numOverlaysPerScreen);
}
}
}
}
int
__glutGetTransparentPixel(Display * dpy, XVisualInfo * vinfo)
{
int i, screen = vinfo->screen;
OverlayInfo *overlayInfo;
findServerOverlayVisualsInfo(dpy);
if (layersRead) {
for (i = 0; i < numOverlaysPerScreen[screen]; i++) {
overlayInfo = &overlayInfoPerScreen[screen][i];
if (vinfo->visualid == overlayInfo->overlay_visual) {
if (overlayInfo->transparent_type == TransparentPixel) {
return (int) overlayInfo->value;
} else {
return -1;
}
}
}
}
return -1;
}
XLayerVisualInfo *
__glutXGetLayerVisualInfo(Display * dpy, long lvinfo_mask,
XLayerVisualInfo * lvinfo_template, int *nitems_return)
{
XVisualInfo *vinfo;
XLayerVisualInfo *layerInfo;
int numVisuals, count, i, j;
vinfo = XGetVisualInfo(dpy, lvinfo_mask & VisualAllMask,
&lvinfo_template->vinfo, nitems_return);
if (vinfo == NULL)
return NULL;
numVisuals = *nitems_return;
findServerOverlayVisualsInfo(dpy);
layerInfo = (XLayerVisualInfo *)
malloc(numVisuals * sizeof(XLayerVisualInfo));
if (layerInfo == NULL) {
XFree(vinfo);
return NULL;
}
count = 0;
for (i = 0; i < numVisuals; i++) {
XVisualInfo *pVinfo = &vinfo[i];
int screen = pVinfo->screen;
OverlayInfo *overlayInfo = NULL;
overlayInfo = NULL;
if (layersRead) {
for (j = 0; j < numOverlaysPerScreen[screen]; j++)
if (pVinfo->visualid ==
overlayInfoPerScreen[screen][j].overlay_visual) {
overlayInfo = &overlayInfoPerScreen[screen][j];
break;
}
}
if (lvinfo_mask & VisualLayerMask) {
if (overlayInfo == NULL) {
if (lvinfo_template->layer != 0)
continue;
} else if (lvinfo_template->layer != overlayInfo->layer)
continue;
}
if (lvinfo_mask & VisualTransparentType) {
if (overlayInfo == NULL) {
if (lvinfo_template->type != None)
continue;
} else if (lvinfo_template->type !=
overlayInfo->transparent_type)
continue;
}
if (lvinfo_mask & VisualTransparentValue) {
if (overlayInfo == NULL)
/* Non-overlay visuals have no sense of
TransparentValue. */
continue;
else if (lvinfo_template->value != overlayInfo->value)
continue;
}
layerInfo[count].vinfo = *pVinfo;
if (overlayInfo == NULL) {
layerInfo[count].layer = 0;
layerInfo[count].type = None;
layerInfo[count].value = 0; /* meaningless */
} else {
layerInfo[count].layer = overlayInfo->layer;
layerInfo[count].type = overlayInfo->transparent_type;
layerInfo[count].value = overlayInfo->value;
}
count++;
}
XFree(vinfo);
*nitems_return = count;
if (count == 0) {
XFree(layerInfo);
return NULL;
} else
return layerInfo;
}
#if 0 /* Unused by GLUT. */
Status
__glutXMatchLayerVisualInfo(Display * dpy, int screen,
int depth, int visualClass, int layer,
XLayerVisualInfo * lvinfo_return)
{
XLayerVisualInfo *lvinfo;
XLayerVisualInfo lvinfoTemplate;
int nitems;
lvinfoTemplate.vinfo.screen = screen;
lvinfoTemplate.vinfo.depth = depth;
#if defined(__cplusplus) || defined(c_plusplus)
lvinfoTemplate.vinfo.c_class = visualClass;
#else
lvinfoTemplate.vinfo.class = visualClass;
#endif
lvinfoTemplate.layer = layer;
lvinfo = __glutXGetLayerVisualInfo(dpy,
VisualScreenMask | VisualDepthMask |
VisualClassMask | VisualLayerMask,
&lvinfoTemplate, &nitems);
if (lvinfo != NULL && nitems > 0) {
*lvinfo_return = *lvinfo;
return 1;
} else
return 0;
}
#endif
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