From f579f7e654be0792294a299a32cc0d6f80d74e7e Mon Sep 17 00:00:00 2001
From: Alan Coopersmith <alan.coopersmith@oracle.com>
Date: Sun, 21 Apr 2024 14:36:31 -0700
Subject: Present: add per-crtc capabilities to -ext output

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Part-of: <https://gitlab.freedesktop.org/xorg/app/xdpyinfo/-/merge_requests/13>
---
 configure.ac |  2 +-
 xdpyinfo.c   | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index c3d3543..e4367d8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -138,7 +138,7 @@ PKG_CHECK_MODULES(DPY_XTST, xtst,
 	AC_CHECK_HEADERS([X11/extensions/record.h],,,[#include <X11/Xlib.h>])
 	CPPFLAGS="$SAVE_CPPFLAGS"],[echo "not found"])
 
-PKG_CHECK_MODULES(DPY_XPRESENT, xpresent,
+PKG_CHECK_MODULES(DPY_XPRESENT, [xpresent xrandr >= 1.2],
 	[SAVE_CPPFLAGS="$CPPFLAGS"
 	CPPFLAGS="$CPPFLAGS $DPY_XPRESENT_CFLAGS $DPY_X11_CFLAGS"
 	AC_CHECK_HEADERS([X11/extensions/Xpresent.h],,,[#include <X11/Xlib.h>])
diff --git a/xdpyinfo.c b/xdpyinfo.c
index c1173f4..3e3caf1 100644
--- a/xdpyinfo.c
+++ b/xdpyinfo.c
@@ -143,6 +143,7 @@ in this Software without prior written authorization from The Open Group.
 #endif
 #ifdef PRESENT
 #include <X11/extensions/Xpresent.h>
+#include <X11/extensions/Xrandr.h>
 #endif
 #include <X11/Xos.h>
 #include <stdio.h>
@@ -1423,12 +1424,22 @@ static int print_present_info(Display *dpy, const char *extname)
 {
     int                  opcode, event_base, error_base;
     int                  major_version, minor_version;
+    Bool                 query_crtcs = False;
 
     if (!XPresentQueryExtension(dpy, &opcode, &event_base, &error_base)
         || !XPresentQueryVersion(dpy, &major_version, &minor_version))
         return 0;
     print_standard_extension_info(dpy, extname, major_version, minor_version);
 
+    if (XRRQueryExtension (dpy, &event_base, &error_base)) {
+        int rr_major, rr_minor;
+
+        if (XRRQueryVersion (dpy, &rr_major, &rr_minor) &&
+            (rr_major == 1) && (rr_minor >= 2)) {
+            query_crtcs = True;
+        }
+    }
+
     for (int i = 0; i < ScreenCount (dpy); i++) {
         Window screen_root = RootWindow(dpy, i);
         uint32_t capabilities = XPresentQueryCapabilities(dpy, screen_root);
@@ -1436,6 +1447,21 @@ static int print_present_info(Display *dpy, const char *extname)
         printf("  screen #%d capabilities: 0x%x (", i, capabilities);
         print_present_capabilities(capabilities);
         puts(")");
+
+        if (query_crtcs) {
+            XRRScreenResources *res = XRRGetScreenResources (dpy, screen_root);
+
+            if (res != NULL) {
+                for (int c = 0; c < res->ncrtc; c++) {
+                    capabilities = XPresentQueryCapabilities(dpy, res->crtcs[c]);
+                    printf("    crtc 0x%lx capabilities: 0x%x (",
+                           res->crtcs[c], capabilities);
+                    print_present_capabilities(capabilities);
+                    puts(")");
+                }
+                XRRFreeScreenResources(res);
+            }
+        }
     }
 
     return 1;
-- 
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